publicationDate stringlengths 10 10 | abstract stringlengths 0 37.3k | title stringlengths 1 5.74k | doi stringlengths 11 47 ⌀ |
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2020-06-01 | In this study, a new type of steel block slit dampers (BSD) has been investigated. This type of damper not only provides good seismic performance but can be easily repaired and replaced after a strong earthquake. The stability of these dampers under periodic loading and the hysteresis behavior was also investigated in ... | Study of the Effect of Geometric Parameters of Steel Block Slit Dampers on Energy Absorption | 10.1007/s13296-020-00343-3 |
2020-06-01 | This paper addresses the problem of determining the optimal parameters of a sky-hook damper type suspension in the control of the stationary response of half car vehicle models traversing a rough road. The optimal values of the sky-hook damper suspension parameters are obtained by equating the active suspension control... | Optimal response of half car vehicle model with sky-hook damper based on LQR control | 10.1007/s40435-019-00588-9 |
2020-06-01 | Integration of semi-active devices in Automotive Seating System (ASS) with intelligent control policies help attenuation of the vibration transmitted to the occupant. The current work investigates the effectiveness of a semi-active magnetorheological (MR) damper with ASS for a quarter car model with the application of ... | Response characteristics of car seat suspension using intelligent control policies under small and large bump excitations | 10.1007/s40435-019-00569-y |
2020-06-01 | Seismic control of cable-stayed bridges is of paramount importance due to their complex dynamic behavior, high flexibility, and low structural damping. In the present study, several semi-active Fuzzy Control Algorithms (FCAs) for vibration mitigation of Lali Cable-Stayed Bridge are devised. To demonstrate the efficienc... | Semi-active fuzzy control of Lali Cable-Stayed Bridge using MR dampers under seismic excitation | 10.1007/s11709-020-0612-9 |
2020-05-24 | In this paper, we study the indirect stabilization of a system of plate equations which are weakly coupled and locally damped. By virtue of the general results due to Burq in the study of asymptotic behavior of solutions, we prove that the semigroup associated to the system is logarithmically stable under some assumpti... | Stabilization of the weakly coupled plate equations with a locally distributed damping | 10.1186/s13662-020-02677-y |
2020-05-15 | This paper is concerned with the asymptotic behavior of solutions to a non-autonomous stochastic wave equation with additive white noise, for which the nonlinear damping has a critical cubic growth rate. By showing the pullback asymptotic compactness of the stochastic dynamic systems, we prove the existence of a random... | Random attractors for non-autonomous stochastic wave equations with nonlinear damping and white noise | 10.1186/s13662-020-02664-3 |
2020-05-14 | Improving the gait of transfemoral amputees and making it biomimetic and stable has always been a major effort. A dynamic model of the prosthetic device can predict the kinetic and kinematic performances, when incorporated with a musculoskeletal model. In this regard, a dynamic model of a recent trend of variable dampi... | Semi-active control of a swing phase dynamic model of transfemoral prosthetic device based on inverse dynamic model | 10.1007/s40430-020-02387-2 |
2020-05-08 | In this paper, a new transmission form of a planetary gear transmission coupled with a torsional vibration damper (PGT-D) is proposed where the torsional vibration damper is used to replace the conventional manner a certain member in planetary gear fixed with a box. The advantages of the PGT-D are investigated under co... | Dynamic characteristics of a new coupled planetary transmission under unsteady conditions | 10.1007/s40430-020-02371-w |
2020-05-01 | A mesoscale modeling of magneto-rheological damper is performed by using dissipative particle dynamics method. Bounce-back and periodic boundary conditions are used, and the model is validated by Couette flow, Poiseuille flow and flow through a micro-tube. Shear stress and damping behavior are probed with considering h... | Magneto-rheological damper modeling by using dissipative particle dynamics method | 10.1007/s40571-019-00280-x |
2020-05-01 | Dynamics in fractional order systems has been discussed extensively for presenting a possible guidance in the field of applied mathematics and interdisciplinary science. Within hundreds and thousands of reviews, regular papers and drafts, many fractional differential equations are presented for enjoying mathematical pr... | Clarify the physical process for fractional dynamical systems | 10.1007/s11071-020-05637-z |
2020-05-01 | This paper discusses the effect of multi-objective function in angle stability improvement for a single machine connected to an infinite bus system (SMIB). Minimum damping ratio, ξ _ min and maximum damping factor, σ _ max which are commonly used to indicate oscillatory stability condition in power system are merge in ... | Swarm Intelligence Approach for Angle Stability Improvement of PSS and SVC-Based SMIB | 10.1007/s42835-020-00386-w |
2020-05-01 | The influences of cold-rolling deformation and annealing on the damping capacity of Fe–19Mn–8Cr alloy were investigated. It was observed that the cold-rolled Fe–19Mn–8Cr alloy with a reduction of 10% showed the relatively excellent damping capacity because of the relatively more ε-martensite and lower dislocation densi... | Significant impact of cold-rolling deformation and annealing on damping capacity of Fe–Mn–Cr alloy | 10.1007/s42243-020-00386-0 |
2020-05-01 | A typical quasi-zero stiffness (QZS) vibration isolator composed of two lateral springs and a vertical spring has been widely studied previously, aiming to widen the frequency range of isolation without increasing the static displacement. However, there is still a gap between the previous dynamic model and the practica... | Accurate modeling and analysis of a typical nonlinear vibration isolator with quasi-zero stiffness | 10.1007/s11071-020-05642-2 |
2020-05-01 | A friction-type tensioner is widely used in a belt drive system for maintaining belt tension constantly and reducing vibration. Owing to friction dampings, the curve of the reaction torque and the imposed angle of tensioner arm is a hysteretic loop. Here, the hysteretic behavior of tensioner is considered in dynamic an... | Method for estimating vibration responses of belt drive systems with a nonlinear tensioner | 10.1007/s11071-020-05617-3 |
2020-05-01 | The classical methods of surface damping of bending vibrations of thin-walled structures and a promising integrated version with a damping coating consisting of two layers of a material with pronounced viscoelastic properties and an intermediate thin reinforcing layer of a high-modulus material are discussed. A four-la... | Numerical Modeling of Resonant Vibrations of an Elongate Plate with an Integral Damping Coating | 10.1007/s11029-020-09869-3 |
2020-05-01 | In this paper, we study the asymptotic behavior of solutions for the porous thermoelastic system with temperatures and microtemperatures effects. Our main result is to prove the exponential stability in case of zero thermal conductivity and without any condition on the coefficients of the system. This result is new and... | On the stabilization of linear porous elastic materials by microtemperature effect and porous damping | 10.1007/s11565-019-00333-2 |
2020-05-01 | Two condensed electron-beam copper coatings, one consisting of copper and the other of Hf/Ag/Ni/Cr microlayers, were deposited onto a titanium alloy (Ti−6Al−4V) substrate to study the energy dissipation and fatigue resistance in the uncoated and coated samples under nonbreaking and breaking cyclic stresses. The microla... | Effective Reduction of Cyclic Stresses in Coated Samples | 10.1007/s11106-020-00139-4 |
2020-05-01 | In the past few decades, many efforts have been carried out to investigate and improve the cyclic performance of the precast structure joints using high-strength steel bars and plates. However, the utilization of high-damping rubber (HDR) is mainly limited as the bearing pad below the structural components to dissipate... | Horizontal Cyclic Performances of Hook-End U-Shaped High-Damping Rubber Jointed Precast Frame | 10.1007/s40999-019-00486-3 |
2020-05-01 | Abstract — The article presents an algorithm for and results from studying the motion of a rotor involving its simultaneous rubbing against the stator elements in the turbine set span and supports. The aim of the study was to develop the mathematical model describing vibration of the rotor resting in a few supports and... | Turbine Generator Rotor Vibrations with Rubbing in the Span and Supports | 10.1134/S0040601520050092 |
2020-05-01 | Abstract The solution to the problem of oscillations of a circular cylinder in fluid of finite depth beneath an ice cover in the neighborhood of a vertical wall is obtained. The ice cover is simulated by a thin elastic semi-infinite plate of constant thickness. Different boundary conditions at the plate edge are consid... | Oscillations of a Cylinder beneath an Ice Cover in the Neighborhood of a Vertical Wall | 10.1134/S0015462820030131 |
2020-05-01 | Transporting an object during locomotion is one of the most common activities humans perform. Previous studies have shown that continuous and predictive control of grip force, along with the inertial load force of the object, is required to complete this task successfully. Another possible CNS strategy to ensure the dy... | Muscle synergy for upper limb damping behavior during object transport while walking in healthy young individuals | 10.1007/s00221-020-05800-3 |
2020-05-01 | Abstract Theoretical studies and design studies have been conducted to demonstrate the possibility of using a long hydrodynamic damper in the supports of a hydrogen pump rotor was shown. The complex problem of rotor dynamics and design synthesis of a hydrodynamic damper for a turbopump assembly (TPA) was solved. The ge... | Development of Damping Support for a Turbine Pump Assembly of a Cryogenic Fuel Aviation Gas Turbine Engine | 10.3103/S1068366620030034 |
2020-05-01 | Abstract —The dependence of the impact strength and damping characteristics of сBN–Al composite materials on the specific surface (grain size) of cubic boron nitride powders has been investigated. The correlation between the damping characteristics of the composite material and its phase composition has been establishe... | The Effect of Charge Grit on Impact Strength and Damping Characteristics of BN–Al Composite Materials | 10.3103/S1063457620030041 |
2020-04-23 | Titanium nitride (TiN) thin films are deposited on titanium (Ti) substrates by pulsed laser deposition and radio frequency magnetron sputtering. The main goal of this research is to improve the corrosion resistance and the vibration damping performance of the Ti substrates by surface modification of the substrates with... | Enhancement in corrosion resistance and vibration damping performance in titanium by titanium nitride coating | 10.1007/s42452-020-2777-1 |
2020-04-15 | Röckner and Zhang (Probab Theory Relat Fields 145, 211–267, 2009) proved the existence of a unique strong solution to a stochastic tamed 3D Navier–Stokes equation in the whole space and for the periodic boundary case using a result from Stroock and Varadhan (Multidimensional diffusion processes, Springer, Berlin, 1979)... | Stochastic Tamed Navier–Stokes Equations on
$${\mathbb {R}}^3$$
R
3
: The Existence and the Uniqueness of ... | 10.1007/s00021-020-0480-z |
2020-04-15 | Transmission lines are prone to external excitations due to their low density and internal damping coefficient. They are vulnerable to some natural events such as wind and rain which may disrupt power transmission. Forced vibration due to external disturbances is one of the most frequent causes of failures in these lin... | Optimum design of tuned mass damper via PSO algorithm for the passive control of forced oscillations in power transmission lines | 10.1007/s42452-020-2677-4 |
2020-04-11 | In the present study, the magnetorheological fluid (MRF) samples are prepared using pure carbonyl iron particles (CIPs), CIPs/Claytone APA/Molyvan 855 additive, and friction reducer dispersed in poly-alpha-olefin oil. The scanning electron microscopy reveals that the Claytone additive morphology looks like a surface ab... | Investigation of sedimentation, rheological, and damping force characteristics of carbonyl iron magnetorheological fluid with/without additives | 10.1007/s40430-020-02322-5 |
2020-04-11 | In order to achieve a high performance and to ensure an operation with a unit power factor with respect to imposed reference signals, the input–output feedback linearization technique with a sliding mode controller was proposed to control the induction motor fed by matrix converter drive system. In addition, the direct... | Feedback linearization associated to a sliding mode controller for an operating with unity power factor of induction motor fed by matrix converter | 10.1007/s42452-020-2674-7 |
2020-04-07 | In this paper, we provide a new approach to get global well-posedness for the 3D liquid crystal system with large vertical velocity in the critical L ^2 framework. The novelty is that there is not one additional derivative when we treat the pressure. Furthermore, our idea can be applied to get global well-posedness for... | A New Approach to the 3D Liquid Crystal System with Large Vertical Velocity in the Critical L^2 Framework | 10.1007/s11040-020-09335-5 |
2020-04-02 | In this research, chemically synthesized titanium oxide (TiO_2) nano-powder was utilized for upgrading mechanical and vibrational applications of pineapple, banana and sisal fibers. The substitution of TiO_2 upto 3% enhanced the tensile, impact and flexural strength of pineapple/sisal, sisal/banana and banana/pineapple... | Effect of TiO_2 nano-filler in mechanical and free vibration damping behavior of hybrid natural fiber composites | 10.1007/s40430-020-02308-3 |
2020-04-01 | A model of process damping in milling was developed in this study. The process damping is a critical parameter to increase the stable cutting region at low cutting speed to avoid chatter. The previous studies conducted experiments to estimate the process damping. Nevertheless, it is time and cost consuming. A model of ... | Estimation of Process Damping Coefficient Using Dynamic Cutting Force Model | 10.1007/s12541-019-00297-5 |
2020-04-01 | Flexible silicone tubes are nowadays broadly employing in medical applications such as drugs or blood-conveying tubes, various infusions as well as medical pumps, and ventilators tubes. Due to better resistance to corrosion and erosion, the subsequent diminishing of wall thickness and change in stiffness of silicone tu... | Effect of Sagging on Dynamic Characteristics of Silicone Tube Conveying Fluid | 10.1007/s40032-019-00552-8 |
2020-04-01 | This paper presents an analysis of the vibrational behavior of a rotating viscoelastic sandwich pre-twisted beams with a setting angle and with various viscoelastic stiffness laws. The governing equations of motion are derived using the Lagrange formulation and the assumed modes method. The obtained nonlinear eigenvalu... | Modal analysis of rotating pre-twisted viscoelastic sandwich beams | 10.1007/s00466-019-01806-z |
2020-04-01 | In this work we investigate asymptotic stability and instability at infinity of solutions to a logarithmic wave equation $$\begin{aligned} u_{tt}-\Delta u + u + (g\,*\, \Delta u)(t)+ h(u_{t})u_{t}+|u|^{2}u=u\log |u|^{k}, \end{aligned}$$ u tt - Δ u + u + ( g ∗ Δ u ) ( t ) + h ( u t ) u t + | u | 2 u = u log | u | k , in... | General Stability and Exponential Growth for a Class of Semi-linear Wave Equations with Logarithmic Source and Memory Terms | 10.1007/s00245-018-9508-7 |
2020-04-01 | In this paper we study the stability problem of a tree of elastic strings with local Kelvin–Voigt damping on some of the edges. Under the compatibility condition of displacement and strain and continuity condition of damping coefficients at the vertices of the tree, exponential/polynomial stability are proved. Our resu... | Stability of the wave equations on a tree with local Kelvin–Voigt damping | 10.1007/s00233-019-10064-7 |
2020-04-01 | Abstract The features of identifying the damping properties of viscoelastic materials caused by their dependence on a large number of external factors are discussed. The main propositions of the international standard on the experimental method for determining the damping properties of viscoelastic materials under cycl... | An Investigation into the ASTM E756-05 Test Standard Accuracy on Determining the Damping Properties of Materials in Tension-Compression | 10.3103/S106879982002004X |
2020-04-01 | Nub-and-sleeve of last-stage blade for steam turbine is a part-span damper. The nub is vulnerable to fretting cracking since it is in contact with the sleeve under centrifugal force, and a small-amplitude oscillatory movement occurs at the nub-sleeve contact interface due to the blade vibration during operation of turb... | Fretting cracking behavior of nub of last-stage blade for steam turbine | 10.1007/s12206-020-0314-1 |
2020-04-01 | In this paper, cyclic behavior of a new type of beam-to-column connection comprising yielding damper with a circular pattern at depth of the beam was evaluated. The effects of different parameters on proposed connection behavior were also studied. Results of both finite element analysis and experimental tests showed th... | Numerical and Experimental Studies on Cyclic Behavior of Beam-to-Column Connection with Yielding Steel Damper | 10.1007/s13296-019-00298-0 |
2020-04-01 | The aseismic design of cable-stayed bridges in the transverse direction with newly proposed metallic dampers that can accommodate both longitudinal and transverse movement of the deck has recently been considered. This work focuses on developing a simplified method to design an appropriate metallic damper. The seismic ... | A simplified design method for metallic dampers used in the transverse direction of cable-stayed bridges | 10.1007/s11803-020-0575-9 |
2020-04-01 | This study investigates the effect of nonlinear inertia on the dynamic response of an asymmetric building equipped with Tuned Mass Dampers (TMDs). In the field of structural engineering, many researchers have developed models to study the behavior of nonlinear TMDs, but the effect of nonlinear inertia has not received ... | Effect of inertia nonlinearity on dynamic response of an asymmetric building equipped with tuned mass dampers | 10.1007/s11803-020-0577-7 |
2020-03-28 | The present study evaluates the dynamic response of connecting tubes for transient pressure measurement. A systematic study is conducted to quantify the amplitude and phase distortion of connecting tubes of diameter 1, 2 and 3 mm with different lengths (10–50 cm). The experimental measurements and theoretical predictio... | Study on connecting tube dynamics for transient pressure measurement | 10.1007/s12046-020-1310-y |
2020-03-19 | A damped Duffing equation with a singularity is considered in this paper, where the elastic restoring force g has a singularity at origin and satisfies superlinear condition at infinity. By applying the twist theorem of nonarea-preserving map, we obtain the equation has at least one period- mT solution, where the minim... | Damped superlinear Duffing equation with strong singularity of repulsive type | 10.1007/s11784-020-0774-z |
2020-03-13 | The goal of this paper is to study the system of rotating fluids between two infinite parallel plates with Dirichlet boundary conditions and with small viscosity which vanishes when the Rossby number goes to zero. We want to improve the convergence result of [ 18 ] and show the global in time convergence of the weak so... | Damping effects in boundary layers for rotating fluids with small viscosity | 10.1007/s00033-020-1286-9 |
2020-03-09 | In this paper, we propose a linearly implicit Fourier pseudo-spectral scheme, which preserves the total mass and energy conservation laws for the damped nonlinear Schrödinger equation in three dimensions. With the aid of the semi-norm equivalence between the Fourier pseudo-spectral method and the finite difference meth... | A linearly implicit structure-preserving Fourier pseudo-spectral scheme for the damped nonlinear Schrödinger equation in three dimensions | 10.1007/s10444-020-09781-3 |
2020-03-02 | An equivalent mechanical model with the equivalent physical meaning of mass-spring-damping is proposed for cylindrical lithium-ion batteries through experiments and theory. The equivalent mechanical model of a cylindrical lithium-ion battery consists of a spring-damping parallel unit. Therefore, a spring-damping parall... | Mass-Spring-Damping Theory Based Equivalent Mechanical Model for Cylindrical Lithium-ion Batteries under Mechanical Abuse | 10.1186/s10033-020-00440-8 |
2020-03-01 | The isobaric Grüneisen parameter and the wavenumber (frequency) of various Raman modes in PbZr_1-xTi_xO_3 (PZT x = 0.48) ceramic were calculated by means of the unit cell volume of this crystal. In addition, the damping constant (linewidth) of the Raman modes studied was computed from the pseudospin-phonon coupled and ... | A thermodynamic study on PbZr_0.52Ti_0.48O_3 ceramic close to the tetragonal-cubic transition | 10.1007/s41779-019-00386-8 |
2020-03-01 | Many physical processes in nature exhibit complex dynamics that result from a combination of multiscale, nonlinear, non-local, and memory effects. Recent experimental measurements conducted in a variety of physical domains have shown that, at the macroscale level, these effects typically result in significant deviation... | Application of variable- and distributed-order fractional operators to the dynamic analysis of nonlinear oscillators | 10.1007/s11071-020-05488-8 |
2020-03-01 | In this study, inelastic floor spectra are developed for designing acceleration-sensitive nonstructural components (NSCs). The parameters response modification (reduction) factor, $$ R_{\text{cc}} $$ R cc , and inelastic displacement ratio, $$ C_{\text{cc}} $$ C cc , are evaluated to quantify the effects of NSCs inelas... | Inelastic floor spectra for designing anchored acceleration-sensitive nonstructural components | 10.1007/s10518-019-00760-8 |
2020-03-01 | A liquid storage container installed on the top of a fixed offshore platform is used as a tuned liquid damper (TLD) to suppress structural vibration through sloshing motion and viscous energy dissipation. To further optimize TLD capability on suppressing vibration and accurately predict nonlinear coupled processes betw... | Numerical and experimental study of tuned liquid damper effects on suppressing nonlinear vibration of elastic supporting structural platform | 10.1007/s11071-019-05447-y |
2020-03-01 | Abstract The stalk of Vorticella convallaria , a sessile ciliated protozoan, contracts in a few milliseconds at a maximum speed of ~ 10 mm/s and generates a contractile force of ~ 10 nN. After powerful contraction, the stalk slowly returns to its extended state, and this relaxation process completes and resets the cont... | Fluid dynamic estimation of the effective spring constant of the relaxing stalk of Vorticella convallaria | 10.1007/s42791-019-00028-x |
2020-03-01 | This study investigates the effect of damping on the seismic demands imposed on lightweight nonstructural components. The investigation was performed utilizing a total of 113 floor acceleration recordings obtained from instrumented buildings located in California. Results are presented as damping modification factors, ... | The effect of damping on floor spectral accelerations as inferred from instrumented buildings | 10.1007/s10518-019-00781-3 |
2020-03-01 | This study evaluated the use of scrap tire pads (STPs) made of used tires in a vibration control system for earthquake protection of building structures. Concepts and advantages of the seismic mass damper system using STPs, experimental investigation of a STP unit specimen, and numerical assessment of the control effec... | Use of scrap tire pads in vibration control system for seismic response reduction of buildings | 10.1007/s10518-020-00787-2 |
2020-03-01 | In this paper, we study and compare performance and robustness of linear and nonlinear Lanchester dampers. The linear Lanchester damper consists of a small mass attached to a primary system through a linear dashpot, whereas the nonlinear Lanchester damper is linked to the primary mass through dry friction forces. In ea... | A comparison of robustness and performance of linear and nonlinear Lanchester dampers | 10.1007/s11071-020-05512-x |
2020-03-01 | This paper proposes an enhanced speed control algorithm that synchronizes the rotation speeds of the engine and the drive motor at the engine start to improve the engagement performance of the engine clutch in a parallel hybrid vehicle. The zero overshoot with active damping speed controller proposed in this paper has ... | Zero overshoot speed controller with active damping for improving engine clutch engagement performance | 10.1007/s43236-020-00052-4 |
2020-03-01 | This paper considers a method of determining a chatter-free milling mode using time-domain milling dynamics simulation. The simulation is using a depth-buffer algorithm, an adaptive finite element model of the in-process workpiece, and a phenomenological model of cutting forces. The frequency characteristics of the in-... | Optimal milling modes identification of a jet-engine blade using time-domain technique | 10.1007/s00170-020-05129-9 |
2020-03-01 | Large-scale simulations and forensic analyses of the seismic behaviour of real case studies are often based on simplified analytical approaches to estimate the reduction in fundamental frequency and the amount of radiation damping induced by dynamic soil-foundation-structure (SFS) interaction. The accuracy of existing ... | Effects of soil-foundation-structure interaction on fundamental frequency and radiation damping ratio of historical masonry building sub-structures | 10.1007/s10518-019-00748-4 |
2020-03-01 | This study aims to investigate the nonlinear added mass moment of inertia and damping moment characteristics of large-amplitude ship roll motion based on transient motion data through the nonparametric system identification method. An inverse problem was formulated to solve the first-kind Volterra-type integral equatio... | Nonparametric Identification of Nonlinear Added Mass Moment of Inertia and Damping Moment Characteristics of Large-Amplitude Ship Roll Motion | 10.1007/s11804-020-00129-3 |
2020-03-01 | Impact dampers are usually used to suppress single mode resonance. The goal of this paper is to clarify the difference when the impact damper suppresses the resonances of different modes. A cantilever beam equipped with the impact damper is modeled. The elastic contact of the ball and the cantilever beam is described b... | Suppression of multiple modal resonances of a cantilever beam by an impact damper | 10.1007/s10483-020-2588-9 |
2020-03-01 | The paper presents a new concept of absorbing car body vibrations, which consists in a modification of the construction of the classical mono-tube hydraulic shock absorber by the introduction of an additional inner cylinder with an auxiliary piston. By making an appropriate selection of the system parameters, one may o... | Nonlinear dynamics of a vehicle with a displacement-sensitive mono-tube shock absorber | 10.1007/s11071-020-05532-7 |
2020-03-01 | Resonant ultrasound spectroscopy was used to analyze magnetoelastic damping in Ni–Mn–Ga single crystals in austenite and premartensite phases. Crystals with different treatment were studied, exhibiting different density of antiphase boundaries (APBs), as confirmed by magnetic force microscopy, and different magnetic be... | Large Non-ergodic Magnetoelastic Damping in Ni–Mn–Ga Austenite
| 10.1007/s40830-020-00272-4 |
2020-03-01 | This paper analyzed the hydroelastic behaviors of hydrofoils and marine propellers immersed in incompressible, inviscid and irrotational fluids. Strongly coupled fluid–structure interaction analyses were performed using a three-dimensional (3-D) potential-based panel method in conjunction with a 3-D finite element meth... | Parametric analysis on hydroelastic behaviors of hydrofoils and propellers using a strongly coupled finite element/panel method | 10.1007/s00773-019-00638-z |
2020-03-01 | A prominent weakening in equatorial Atlantic sea surface temperature (SST) variability, occurring around the year 2000, is investigated by means of observations, reanalysis products and the linear recharge oscillator (ReOsc) model. Compared to the time period 1982–1999, during 2000–2017 the May–June–July SST variabilit... | Weakened SST variability in the tropical Atlantic Ocean since 2000 | 10.1007/s00382-020-05138-0 |
2020-03-01 | Abstract To solve various engineering problems, it is often necessary to record signals in the 0.1–2000 Hz range. The lower limit of this range is beyond the operating band of geophones. This article considers extending of geophone frequency responses in two ways: multiplication of the transfer functions and introducti... | Instrumental Methods for Extending the Amplitude-Frequency Responses of a Geophone | 10.3103/S0747923920020048 |
2020-03-01 | The co-placement of mine tailings and fly ash (CMF) can reduce acid mine drainage (AMD) production and decrease metal mobilization. This aids in waste management construction. However, few people have studied a large number of tailing sand–fly ash mixtures under the condition of neutral saturated solution in tailing po... | Shearing resistance of tailing sand waste pollutants mixed with different contents of fly ash | 10.1007/s11356-019-07419-6 |
2020-03-01 | A method of determining the amplitude-frequency characteristics and phase-frequency characteristics of a power system by the exposure of the output adder of an automatic excitation regulator to a white noise signal containing a spectrum of the frequency range of the electromechanical oscillations for different tuning p... | Determination of Frequency Characteristics of a Power System in the Course of Commissioning Operations Performed on the Excitation System of the TG5 Turbogenerator of the Beloyarskaya Nuclear Power Plant | 10.1007/s10749-020-01153-7 |
2020-03-01 | In this paper, we consider the random dichotomous fluctuations on both mass and damping in a fractional oscillator, which is subjected to an additive fractional Gaussian noise and driven by a periodic force. In order to investigate the generalized stochastic resonance (GSR) phenomena, we acquire the exact expression of... | Generalized Stochastic Resonance for a Fractional Noisy Oscillator with Random Mass and Random Damping | 10.1007/s10955-020-02494-3 |
2020-03-01 | The damping of cutting system is an important factor influencing stability in boring and milling process. However, systematical and thorough studies of the influencing mechanism of damping, especially on the chatter stability of rotating cutter bar, are still absent. The damping of a cutting system mainly consists of e... | Investigation of chatter stability of cutting process with a rotating tapered cutter bar considering internal and external damping | 10.1007/s00170-020-05049-8 |
2020-03-01 | MEMS capacitive accelerometers are ubiquitously used in wide-ranging applications. Different applications require a trade-off between design parameters to realize either high sensitivity or precision or wide-dynamic range or speed of response. Planar MEMS structures for sensors usually have a large area compared to thi... | Analysis of damping optimization through perforations in proof-mass of SOI capacitive accelerometer | 10.1007/s10470-019-01560-5 |
2020-03-01 | This paper presents the design concept of a hinged-type wave energy converter, Sea Wave Energy Extraction Device (SeaWEED), and associated numerical and experimental studies of its performance in regular waves. The device is considered as an improved attenuator. A SeaWEED unit consists of four modules that are connecte... | Experimental studies and time-domain simulation of a hinged-type wave energy converter in regular waves | 10.1007/s40868-020-00073-5 |
2020-03-01 | The effectiveness of a tuned mass damper (TMD) in dynamic vibration mitigation of a 20-storey steel benchmark structure (SBB) under real earthquake ground motions is presented. To study the positioning and tuning effect, a TMD is positioned at the largest or relatively larger of the normalized amplitude of mode shape o... | Seismic response control of steel benchmark building with a tuned mass damper | 10.1007/s42107-019-00206-1 |
2020-03-01 | Considering the effect of soil–structure interaction in dynamic analysis of structures can change their responses. It is generally assumed that the structure is located on a rigid foundation and the flexibility effect of the soil is not considered. Researches on the soil–structure interaction show that the dynamic resp... | Modified Tuned Liquid Dampers for Seismic Protection of Buildings Considering Soil–Structure Interaction Effects | 10.1007/s40996-019-00302-x |
2020-02-14 | In order to improve the damping characteristics of a photosensitive resin structure filled with viscous fluid, two improved structures with grooves and holes are investigated. Numerical simulation models of photosensitive resin damping structures are established using the finite element method. The force–displacement c... | Improvement of high damping structures using a photosensitive resin filled with viscous fluid | 10.1007/s40430-020-2205-x |
2020-02-05 | This paper presents design of an self contained actuators unit in wide area damping control of power system in stabilizing system response for both nominal system condition and during actuator faults. First it is presented that use of multiple actuators in wide area control aid in improving damping in power system. A w... | Reconfigurable control as actuator fault-tolerant control design for power oscillation damping | 10.1186/s41601-020-0151-3 |
2020-02-01 | We study the dynamics of many charges interacting with the Maxwell field. The particles are modeled by means of nonnegative distribution functions $$f^+$$ f + and $$f^-$$ f - representing two species of charged matter with positive and negative charge, respectively. If their initial velocities are small compared to the... | A Post-Newtonian Expansion Including Radiation Damping for a Collisionless Plasma | 10.1007/s00332-019-09580-1 |
2020-02-01 | Design and analysis of geosynthetic-reinforced soil structures subjected to repeated loading (e.g. compaction, traffic and earthquake loads) require a proper understanding of the cyclic soil–geosynthetic interface behaviour. This research is undertaken to study the interface properties between sand-expanded polystyrene... | An Experimental Study for the Cyclic Interface Properties of the EPS–sand Mixtures Reinforced with Geogrid | 10.1007/s40999-019-00424-3 |
2020-02-01 | 与传统电厂不同,风能在电力系统中具有不同的结构和功能。这些不同影响电网的能量交换。 因此,电力系统的稳定性将受到风电厂性能的影响,特别是在发生故障时。本文通过基于电压源变换 器传输系统的高压直流电压控制器的辅助设计,以提高风电厂系统的动态稳定性。考虑了VSC 高压 直流系统和风电厂对提高系统稳定性的影响。此外,还提出了一种基于可控性(可观测性)概念的算法, 以选择系统在不同工况下的输入输出信号之间最合适和最有效的耦合。选择耦合应用于阻尼控制器信 号。最后,设计了一种基于交易市场算法的分数阶PID 控制器(FO-PID)作为阻尼控制器。分析结果表 明,风电厂对提高电力系统动态稳定性没有直接贡献。然而,它可以增加振荡模式的可控性,提高辅... | Damping controller design based on FO-PID-EMA in VSC HVDC system to improve stability of hybrid power system | 10.1007/s11771-020-4305-2 |
2020-02-01 | Key message During pruning, shortening branches to decrease crown size significantly affected the vibration properties and mass of trees, but the progressive removal of lower branches only altered mass—not vibration properties. Abstract During pruning, arborists often intend to increase a tree’s resistance to wind load... | Effect of pruning type and severity on vibration properties and mass of Senegal mahogany (Khaya senegalensis) and rain tree (Samanea saman) | 10.1007/s00468-019-01912-8 |
2020-02-01 | Abstract The effect of preliminary preparation of a stoichiometric hydrogen–air mixture (decomposition of a part of molecular hydrogen and molecular oxygen into atomic gases) on the characteristics of a propagating detonation wave is numerically studied using a detailed kinetic mechanism of chemical interaction. It is ... | Detonation Combustion Control Using Preliminary Preparation of the Gas Mixture | 10.1134/S1063785020020248 |
2020-02-01 | The initial boundary value problem for the nonlinear wave equations with damping and logarithmic nonlinearity is investigated in this paper. By making use of modified potential well theory and the technique of Logarithmic-Sobolev inequality, we establish global existence as well as asymptotic behavior of solution, unde... | Global well-posedness for the nonlinear damped wave equation with logarithmic type nonlinearity | 10.1007/s00500-019-04660-6 |
2020-02-01 | The present article highlights the development of hybrid-fiber-reinforced composites using a vacuum-assisted resin transfer molding technique on low-cost flax fibers, carbon fiber, glass fibers and a vinyl ester resin system. Flax fibers are introduced to modulate mechanical properties, green credentials, cost, and the... | Effect of Hybrid Reinforcement on the Mechanical Properties of Vinyl Ester Green Composites | 10.1007/s12221-020-9632-2 |
2020-02-01 | The present paper is aimed to investigate the behavior of Natural Rubber Bearing incorporated with steel ring damper (NRB-SRD). These types of dampers are integrated of several steel rings which are considered with two configurations namely, continual steel ring damper and separate steel ring damper and are inserted be... | Natural Rubber Bearing Incorporated with Steel Ring Damper (NRB-SRD) | 10.1007/s13296-019-00267-7 |
2020-02-01 | Purpose The paper is an attempt to evaluate the efficiency of passive control techniques such as base isolation system (e.g. Lead/Rubber Bearing) and fluid viscous dampers subjected to earthquake ground motions and underground blast-induced vibrations. Two moment-resisting steel frame buildings are analyzed to evaluate... | Performance Evaluation of Moment-Resisting Steel Frame Buildings Under Seismic and Blast-Induced Vibrations | 10.1007/s42417-018-0027-2 |
2020-02-01 | This study focuses on energy harvesting from vehicle suspension by employing a regenerative rotational shock absorber. Designing, manufacturing and testing of a prototype device is done step by step to provide a useful manual for researchers. The prototype damper was especially designed for low frequency applications. ... | Experimental Study of Regenerative Rotational Damper in Low Frequencies | 10.1007/s12239-020-0009-8 |
2020-02-01 | Modern rotating machines operate at higher shaft speeds, crossing a few bending critical speeds, which often induce large dynamic loads on the bearing supports that may increase the rotor orbital whirl motion. Accurate prediction of squeeze-film damper (SFD) forces is the key issue for designers to arrive at a suitable... | Experimental and Analytical Investigation of Short Squeeze-Film Damper (SFD) Under Circular-Centered Orbit (CCO) Motion | 10.1007/s42417-019-00100-9 |
2020-02-01 | It is shown that a passive vibration absorber can completely quench the self-excited vibration only for certain parameter values, like the strength of instability in the primary system. The present paper numerically explores the performance of semi-active vibration absorber in controlling self-excited vibration. In the... | Efficacy of Semi-active Absorber for Controlling Self-excited Vibration | 10.1007/s40032-019-00521-1 |
2020-02-01 | This paper takes into consideration a damped harmonic oscillator model with delayed feedback. After transforming the model into a system of first-order delayed differential equations with a single discrete delay, the single stability switch and multiple stability switches phenomena as well as the existence of Hopf bifu... | Multiple stability switches and Hopf bifurcation in a damped harmonic oscillator with delayed feedback | 10.1007/s11071-019-05389-5 |
2020-01-30 | By the measurement of the frequency and damping time of surface oscillations, excited by a short pulse on a freely floating liquid droplet, the surface tension and viscosity of the liquid can under certain conditions contactlessly be determined. The conventional physical models linking these material properties to the ... | Viscosity Measurement by the
“Oscillating Drop Method”: The Case of Strongly Damped
Oscillations | 10.1007/s10765-020-2608-z |
2020-01-16 | We investigated the effect of magnetically modified natural zeolite on the mechanical and damping properties of natural rubber-nanosilica compounds. We used natural rubber SIR 20 technical specified rubber (TSR) reinforced with a nanosilica filler. The results showed that using zeolite modified with magnetite and titan... | Effects of magnetically modified natural zeolite addition on the crosslink density, mechanical, morphological, and damping properties of SIR 20 natural rubber reinforced with nanosilica compounds | 10.1007/s10965-020-2013-0 |
2020-01-09 | Damping is an important dynamic characteristic of rock masses and has an important impact on seismic engineering. In this paper, a multi-level cyclic loading-unloading triaxial compression experiment was conducted on granite and red sandstone under different confining pressures with two stress paths: one with different... | Experimental study of nonlinear damping characteristics on granite and red sandstone under the multi-level cyclic loading-unloading triaxial compression | 10.1007/s12517-019-5022-8 |
2020-01-07 | We consider a locally damped wave equation in a bounded domain. The damping is nonlinear, involves the Laplace operator, and is localized in a suitable open subset of the domain under consideration. First, we discuss the well-posedness and regularity of the solutions of the system by using a combination of the nonlinea... | Stabilization of the wave equation with a localized nonlinear strong damping | 10.1007/s00033-019-1240-x |
2020-01-01 | This chapter is concerned with damped oscillators. Nonlinear oscillators are mainly dealt with, but linear oscillators are also considered or referred to for the sake of comparison or clear extension of the related methodology. First, Lagrangians and conservation laws of viscously damped linear oscillators as well as D... | Free Damped Oscillators | 10.1007/978-3-030-53172-0_3 |
2020-01-01 | The circuit analysis techniques that we have presented thus far work very well when only resistors Resistors are present in the circuit. | Reactive Circuit Transient Response | 10.1007/978-3-030-31355-5_6 |
2020-01-01 | The stayed-cable is one of vital component of cable-stayed bridges. Stayed-cable is often very long with a small diameter and low mass, which can be considered horizontal flexible structure with very low natural frequency. Under the influence of cyclic load in specific conditions, stayed-cable can store the energy and ... | A Study on Combination of Two Friction Dampers to Control Stayed-Cable Vibration Under Considering its Bending Stiffness | 10.1007/978-981-15-0802-8_10 |
2020-01-01 | Adaptive shock absorbers improve the ride quality by changing the damping characteristic depending on road excitation. An adjustable bypass valve allows to switch between different force characteristics. This paper introduces a new generic damper model which uses a modular damping function (MDF) to adapt the resulting ... | A New Generic Model for Adaptive Shock Absorbers | 10.1007/978-3-030-38077-9_207 |
2020-01-01 | This paper proposes a novel method (PSOMSF) to unified power flow controller (UPFC) for dynamic stability enhancement of single machine infinite bus system (SMIB). This method consists of multi stage fuzzy damping controller and particle swarm optimization (PSO) method used for fixing the fuzzy bounds. Two stages of fu... | A Novel Method for Dynamic Stability Enhancement of SMIB System | 10.1007/978-981-13-8942-9_30 |
2020-01-01 | The damping mechanism of damping system using granules—applied to reduce vibration in structures with high natural frequency and small vibration displacement—was investigated. A computational model of a single-degree-of-freedom vibration system with a granular-material damper was constructed and used to study the mecha... | Damping Mechanisms of a Vibration-Reduction System Using Granules | 10.1007/978-3-030-55061-5_2 |
2020-01-01 | The proposed work is based on the Synchronized Switch Damping technique (SSD) which has already been applied in reducing and suppressing structure vibration, a new approach called Synchronized Switch Damping with Diode (SSDD) for enhanced vibration damping of smart structure is developed, and it applies on energy redis... | Synchronized Switch Damping with Diode (SSDD) Based on a Network of Piezoelectric Elements for Improved Vibration Damping of Smart Structure | 10.1007/978-981-15-0860-8_37 |
2020-01-01 | In this study, the Mg_97Zn_1Y_2–Al alloy was selected as a high damping material, anelastic and microplastic damping were analyzed by studying strain amplitude-dependent damping curves of the alloy. The C_1 and C_2 values of the Granato–Lücke (G–L) model, the theoretical basis of anelastic damping, can be calculated fo... | Anelastic and Microplastic Damping of an Mg–Zn–Y–Al Alloy | 10.1007/s12540-019-00302-6 |
2020-01-01 | Sounds originate from vibrational waves traveling in a material. Animals take advantage of sounds to get and send notice of opportunities and impending dangers. Within the science of acoustics, we have applied mechanical principles to study how life forms detect and generate sounds, how these sounds carry information a... | Acoustics in Biology and Medicine | 10.1007/978-3-030-44146-3_5 |
2020-01-01 | This survey provides an insight into the modeling and testing of uniaxial friction dampers. The focus is on attenuating the linear relative movement along planar surfaces for frequencies between 10 Hz and 1 kHz. An overview of the different approaches seen in the literature concerning friction damping is provided. Exam... | A review of friction damping modeling and testing | 10.1007/s00419-019-01600-6 |
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