publicationDate stringlengths 10 10 | abstract stringlengths 0 37.3k | title stringlengths 1 5.74k | doi stringlengths 11 47 ⌀ |
|---|---|---|---|
2018-09-21 | In power systems, increasing the renewable energy penetration with small signal stability is one of the demanding and critical tasks in recent days. This research work aims to develop a multistage optimization technique, namely particle swarm optimization (PSO), for improving both the energy penetration and small signa... | An enhanced particle swarm optimization algorithm for improving the renewable energy penetration and small signal stability in power system | 10.1186/s40807-018-0053-4 |
2018-09-15 | Background Dramatic progress has recently been made in cryo-electron microscopy technologies, which now make possible the reconstruction of a growing number of biomolecular structures to near-atomic resolution. However, the need persists for fitting and refinement approaches that address those cases that require modeli... | Accurate flexible refinement of atomic models against medium-resolution cryo-EM maps using damped dynamics | 10.1186/s12900-018-0089-0 |
2018-09-05 | In this paper we investigate the existence and uniqueness of weighted pseudo almost automorphic mild solution for a class of strongly damped wave equations where the semilinear forcing term is a Stepanov weighted pseudo almost automorphic function. | Strongly damped wave equations with Stepanov type nonlinear forcing term | 10.1186/s13662-018-1770-0 |
2018-09-01 | A thick 400-micron amorphous carbon nitride (a-CN_X) coating material was synthesized by means of plasma-enhanced chemical vapor deposition process. High-power impulse magnetron sputtering technique was used to sputter a pure graphite target plate in reactive argon (Ar), nitrogen (N_2) and acetylene (C_2H_2) environmen... | Manufacturing and Characterization of a Carbon-Based Amorphous (a-CN_X) Coating Material | 10.1007/s41871-018-0014-y |
2018-09-01 | The technique of squeeze liquid film damping is adopted in precision boring. After finishing the static stimulating vibration experiments, dynamic experiments and real cutting experiments, the results show that squeeze liquid film damper (SLFD) can ameliorate the machining condition and improve the precise boring quali... | Research on Effect of Decreasing Vibration with Liquid Film Damping in Precision Boring | 10.1007/s11277-017-5141-z |
2018-09-01 | Behaviors of sandy soils under dry and saturated conditions significantly differ from each other, especially under cyclic loading conditions. This paper highlights the behavior of dry and saturated Brahmaputra sand (DBS and SBS) subjected to constant strain monotonic and cyclic triaxial tests. Monotonic tests were cond... | High Strain Dynamic Properties of Perfectly Dry and Saturated Cohesionless Soil | 10.1007/s40098-017-0255-5 |
2018-09-01 | This paper is concerned with the development of mesh free model for the performance analysis of active constrained layered damping ( ACLD ) treatments on smart laminated composite beams. The overall structure is composed of a substrate laminated composite beam integrated with a viscoelastic layer and a piezoelectric la... | Analysis of smart damping of laminated composite beams using mesh free method | 10.1007/s10999-017-9379-0 |
2018-09-01 | Abstract An analysis of the characteristics of the output filters of electromagnetic compatibility of a frequency converter, including their logarithmic amplitude-frequency characteristics, is carried out by mathematical modeling. The filters with the different parameters, are considered in the steady operation mode at... | Characteristics of Output Filters Providing Electromagnetic Compatibility of the Frequency Converter of an Electric Drive with Asynchronous Motors | 10.3103/S1068371218090080 |
2018-09-01 | Lightweight sand–EPS beads composite is a new artificial geo-material, which has been recently found applications in geotechnical engineering projects. A series of laboratory tests were carried out using a large-scale cyclic direct shear test apparatus to evaluate the monotonic, cyclic and post-cyclic behaviour of an i... | Cyclic and Post-Cyclic Shear Behaviour of Interface between Geogrid and EPS Beads-Sand Backfill | 10.1007/s12205-018-0945-2 |
2018-09-01 | Since the power transmission line (PTL) passes through the high mountain and heavy snowfall region, it is necessary to keep the stability of the PTL. In this study, PTL is modeled as the mass-spring-damper system by using multi-body dynamics analysis program. In order to analyze the dynamic behavior of PTL, a damping c... | Galloping Simulation of the Power Transmission Line under the Fluctuating Wind | 10.1007/s12541-018-0164-2 |
2018-09-01 | Slippage corresponds to the relative displacement of a bolted joint subjected to shear loads since the construction clearance between the bolt shank and the bolthole at assembly can cause joint slip. Deflections of towers with joint slippage effects is up to 1.9 times greater than the displacements obtained by linear a... | Joint slip investigation based on finite element modelling verified by experimental results on wind turbine lattice towers | 10.1007/s11709-017-0393-y |
2018-09-01 | To enhance the low-frequency vibration isolation performance of the high-static–low-dynamic stiffness (HSLDS) isolator, a novel design of the geometric nonlinear damping (GND) comprising semi-active electromagnetic shunt damping is proposed. The GND is dependent on the vibration displacement and velocity, which can mak... | Enhanced isolation performance of a high-static–low-dynamic stiffness isolator with geometric nonlinear damping | 10.1007/s11071-018-4328-5 |
2018-09-01 | For any linear dynamical system coupled with one or more nonlinear dynamical attachments, the effect of nonlinear energy content on modal damping variations of the entire system has not been clearly addressed in the literature. Accordingly, a novel method is employed here to formulate the amplitude-dependent modal damp... | Modal damping variations in nonlinear dynamical systems | 10.1007/s11071-018-4342-7 |
2018-09-01 | Research on dynamics and stability of machining operations has attracted considerable attention. Currently, most studies focus on the forward solution of dynamics and stability in which material properties and the frequency response function at the tool tip are known to predict stable cutting conditions. However, the f... | Use of inverse stability solutions for identification of uncertainties in the dynamics of machining processes | 10.1007/s40436-018-0233-x |
2018-09-01 | The damping capacity of Ni–Mn–Ga–Gd films annealed for different durations has been investigated by dynamic mechanical analysis (DMA) measurement. The DMA results show that the internal friction peaks are absent in the IF curves, due to very low transformation rate and low transformation strain in the films. With the i... | Damping Capacity of Ni–Mn–Ga–Gd High-Temperature Shape Memory Thin Film | 10.1007/s40830-018-0182-z |
2018-09-01 | The effect of intrinsic damping on the interaction between a two-level atom and a multi-photon cavity field in the presence of an external classical field is studied. Under certain conditions and use of a transformation, the system is transformed to a generalized Jaynes Cummings model, with the influence of classical f... | Influence of an External Classical Field on the Interaction Between a Field and an Atom in Presence of Intrinsic Damping | 10.1007/s10773-018-3799-y |
2018-09-01 | In this paper, we demonstrate a method for self-organization and leader following of nonholonomic robotic swarm based on spring damper mesh. By self-organization of swarm robots we mean the emergence of order in a swarm as the result of interactions among the single robots. In other words the self-organization of swarm... | Virtual spring damper method for nonholonomic robotic swarm self-organization and leader following | 10.1007/s00161-018-0664-4 |
2018-09-01 | This paper is concerned with the oscillatory behavior of the damped half-linear oscillator ( a ( t ) ϕ _ p ( x ′))′ + b ( t ) ϕ _ p ( x ′) + c ( t ) ϕ _ p ( x ) = 0, where ϕ p ( x ) = | x |^ p −1 sgn x for x ∈ ℝ and p > 1. A sufficient condition is established for oscillation of all nontrivial solutions of the damped h... | Integral averaging technique for oscillation of damped half-linear oscillators | 10.21136/CMJ.2018.0645-16 |
2018-09-01 | Presented in this paper is an experimental investigation of a passive auto-tuning mass damper with Pulley connections (PATPD). It is a passive vibration control device that consists of a box filled with silica sand on roller supports. The silica sand provides the mass of the damper. The PATPD is connected to the struct... | Experimental investigation on a passive auto-tuning mass damper for vibration control | 10.1007/s40435-017-0381-z |
2018-09-01 | The fly ash cenosphere/AZ91D composites were successfully prepared and isothermally heat-treated at different temperatures for different time. The effects of semi-solid isothermal heat treatment on the microstructures and damping capacities of fly ash cenosphere/AZ91D composites were investigated. With the increase in ... | Effects of Semi-solid Isothermal Heat Treatment on Microstructures and Damping Capacities of Fly Ash Cenosphere/AZ91D Composites | 10.1007/s40195-018-0722-8 |
2018-08-30 | The Newtonian gravitational constant, G , is one of the most fundamental constants of nature, but we still do not have an accurate value for it. Despite two centuries of experimental effort, the value of G remains the least precisely known of the fundamental constants. A discrepancy of up to 0.05 per cent in recent det... | Measurements of the gravitational constant using two independent methods | 10.1038/s41586-018-0431-5 |
2018-08-21 | This paper presents an analytical study on the effect of couple stress on static and dynamic characteristics of wide tapered land slider bearing in the presence of applied magnetic field. A non-dimensional modified Reynolds equation is derived for the bearing under consideration. Closed-form expressions for the steady ... | Effect of couple stresses on static and dynamic characteristics of MHD wide tapered land slider bearing | 10.1007/s12046-018-0940-9 |
2018-08-17 | A nonlinear transient model for the prediction of damper force based on the flow of magnetorheological (MR) fluid through the channel of a semi-active MR damper has been presented which has a potential for its application in the design of adaptive control policies for such dampers. In this work, a transient analytical ... | A nonlinear transient model for magnetorheological damper response for a time varying field controllable yield shear stress | 10.1007/s40430-018-1343-x |
2018-08-09 | In this paper, we consider the Cauchy problem in $$\mathbb {R}^n,$$ R n , $$n\ge 1,$$ n ≥ 1 , for semilinear damped wave equations with space–time dependent potential and nonlinear memory. A blow-up result under some positive data in any dimensional space is obtained. Moreover, the local existence in the energy space i... | Finite time blow-up for damped wave equations with space–time dependent potential and nonlinear memory | 10.1007/s00030-018-0533-7 |
2018-08-01 | The reduction of vibration by acoustic black holes (ABHs) with damping treatments can be achieved in two stages: energy focalization and energy dissipation. The energy focalization is mainly due to changes of the local thickness by slowing down the flexural wave speed and energy dissipation can be achieved by using vis... | Numerical analysis of wave energy dissipation by damping treatments in a plate with acoustic black holes | 10.1007/s12206-018-0705-8 |
2018-08-01 | This paper systematically illustrates the deformation and damping mechanism of magnetic shape memory alloy (MSMA) and builds a damping mathematical model by using a single-degree-of-freedom vibration system. The results indicate that absorbed damping is proportional to the quadratic of external force and inversely prop... | Research and Experimental Analysis of Damping Characteristics of Magnetic Shape Memory Alloy | 10.1007/s42341-018-0047-3 |
2018-08-01 | Decay of the energy for the Cauchy problem of the wave equation on Riemannian manifolds with a variable damping term $$V(x)u_{t}$$ V ( x ) u t is considered, where $$V(x) \ge V_{0}(1 + \rho ^{2})^{-\frac{1}{2}}$$ V ( x ) ≥ V 0 ( 1 + ρ 2 ) - 1 2 ( $$\rho $$ ρ being a distance function under the Riemannian metric). Some ... | Energy Decay Rate of the Wave Equations on Riemannian Manifolds with Critical Potential | 10.1007/s00245-017-9399-z |
2018-08-01 | Semi-submersible drilling rigs are offshore plants that perform function such as ocean exploration for oil and gas acquisition, drilling and production, storage and unloading of crude oil and gas. Semi-submersible drilling rigs use watertight dampers as emergency buoyancy holders. Since the watertight damper is an emer... | Design of robust controller of a watertight damper driving system for offshore rigs | 10.1007/s12206-018-0740-5 |
2018-08-01 | When the power transmission line (PTL) passes through a region of high mountains and heavy snowfall, maintaining the stability of the PTL and avoiding sleet jump and galloping are necessary. In this study, PTL is modeled as the mass-spring-damper system by using the multi-body dynamics analysis program, RecurDyn. The l... | Multibody dynamics study on galloping of power transmission line | 10.1007/s12206-018-0710-y |
2018-08-01 | This study investigated the effects of Sc and Zr additions, friction stir processing (FSP), and subsequent solid solution and artificial aging (T6) treatment on the microstructure, damping capacity, and mechanical properties of 7075 Al alloy. The minor Sc and Zr additions promoted the grain refinement of this alloy dur... | Fabrication of 7075-0.25Sc-0.15Zr Alloy with Excellent Damping and Mechanical Properties by FSP and T6 Treatment | 10.1007/s11665-018-3451-2 |
2018-08-01 | Key message Cabling co-dominant stems at different heights and tensions altered neither frequency nor damping ratio, but the location and proportion of pruned crown mass significantly influenced both frequency and damping ratio. Abstract Amenity trees provide many benefits, but can damage property and injure persons. A... | The effect of simulated trunk splits, pruning, and cabling on sways of quercus rubra L. | 10.1007/s00468-018-1690-3 |
2018-08-01 | Machining-induced damage severely affects surface and subsurface integrity in grinding of brittle materials. In this paper, a predictive model of subsurface damage (SSD) is proposed that takes into account grinding parameters and spindle dynamics. Results show that the grinding depth affects SSD, and the model neglecti... | Subsurface damage in grinding of brittle materials considering machining parameters and spindle dynamics | 10.1007/s00170-018-2191-7 |
2018-08-01 | Parametric nonoscillation region is given for the Mathieu-type differential equation $$\begin{aligned} x'' + (-\;\alpha + \beta c(t))\,x = 0, \end{aligned}$$ x ′ ′ + ( - α + β c ( t ) ) x = 0 , where $$\alpha $$ α and $$\beta $$ β are real parameters. Oscillation problem about a kind of Meissner’s equation is also disc... | Nonoscillation of Mathieu’s equation whose coefficient is a finite Fourier series approximating a square wave | 10.1007/s00605-017-1049-7 |
2018-08-01 | Multi-objective optimization approach has been applied to find an optimum Tuned Mass Damper (TMD) to attenuate the earthquake induced vibrations of a ten-stored frame structure. In the optimization process, the Response Surface Methodology (RSM) with the experimental design of central Composite Design (CCD) and weighte... | Multi-Objective Optimization of TMD for Frame Structure Based on Response Surface Methodology and Weighted Desirability Function | 10.1007/s12205-017-0387-2 |
2018-08-01 | The present study has focused on the comparison of MR damper dynamic models for the purpose of hardware in the loop simulation. A vehicle dynamic model for large-sized bus and a control logic for MR damper was built. Two typical MR damper models, viz. Bouc-Wen and hyperbolic tangent model have been considered in this s... | Comparison of Dynamic Models of Mr Damper for Hardware in the Loop Simulation of Large-Sized Buses | 10.1007/s12239-018-0065-5 |
2018-07-24 | Vibration control is one of the prominent factors, especially in lightweight structures in space technology. These structures, due to their low mass and thinness, frequently lose the stability under environmental disturbances. Piezoelectric materials as sensors/actuators have been widely used to control vibrations and ... | Active vibration control of smart beam under parametric variations | 10.1007/s40430-018-1310-6 |
2018-07-16 | We are concerned with dynamical behaviors of solutions to nonlinear damped wave equations with nonlinear dampings and force terms, and subject to Wentzell boundary conditions which can be used to describe, for instance, the boundary behavior of a vibrating elastic body (resp. membrane) coated (resp. edged) with a thin ... | Dynamical behaviors of solutions to nonlinear wave equations with vanishing local damping and Wentzell boundary conditions | 10.1007/s00033-018-0996-8 |
2018-07-11 | The intrinsic damping for the acoustic vibrations of single gold nanorods excited by ultrafast laser has been studied through the atomistic simulations. It is shown that the intrinsic damping for the breathing mode is strongly sensitive to the nanorod sizes, which is very likely due to the different energy redistributi... | Intrinsic damping for ultrafast laser-excited acoustic vibrations of single gold nanorods | 10.1007/s11051-018-4290-7 |
2018-07-05 | In this paper, we study the existence, multiplicity and stability of periodic solutions for a forced pendulum with time-dependent damping. The proof is based on the third order approximation method and a suitable version of the Poincaré–Birkhoff fixed point theorem. | Existence and stability of periodic solutions for a forced pendulum with time-dependent damping | 10.1186/s13661-018-1028-5 |
2018-07-05 | The objective of this paper is to offer sufficient conditions for the oscillation of all solutions of the third order nonlinear damped dynamic equation with mixed arguments of the form ( r 2 ( r 1 ( y Δ ) α ) Δ ) Δ ( t ) + p ( t ) ψ ( t , y Δ ( a ( t ) ) ) + q ( t ) f ( t , y ( g ( t ) ) ) = 0 $$\bigl(r_{2}\bigl(r_{1}\... | Oscillation of third order nonlinear damped dynamic equation with mixed arguments on time scales | 10.1186/s13662-018-1654-3 |
2018-07-01 | To predict the maximum earthquake response of an SDOF structure with a Maxwell fluid damper or supplemental brace-viscous damper system using the seismic design response spectrum technique, a new approach is presented to determine the first- and second-order equivalent viscous damping and stiffness, the peak responses,... | Equivalent damping of SDOF structure with Maxwell damper | 10.1007/s11803-018-0467-4 |
2018-07-01 | In this paper, a battery energy storage system (BESS) based control method is proposed to improve the damping ratio of a target oscillation mode to a desired level by charging or discharging the installed BESS using local measurements. The expected damping improvement by BESS is derived analytically for both a single-m... | Damping control for a target oscillation mode using battery energy storage | 10.1007/s40565-017-0371-3 |
2018-07-01 | Causality in electrodynamics is reviewed in regard to the interrelations among the causal requirement, the analyticity of the dielectric permittivity, and the Kramers-Kronig relations. We show that the collisionless damping (Landau damping) of a plasma wave can be formally derived from the causal requirement imposed on... | Causality in Plasma Electrodynamics | 10.3938/jkps.73.65 |
2018-07-01 | Experimental data clearly show a strong and nonlinear dependence of damping from the maximum vibration amplitude reached in a cycle for macro- and microstructural elements. This dependence takes a completely different level with respect to the frequency shift of resonances due to nonlinearity, which is commonly of 10–2... | Nonlinear damping in large-amplitude vibrations: modelling and experiments | 10.1007/s11071-017-3889-z |
2018-07-01 | Oblique water wave damping by two fully submerged vertical parallel porous plates of different heights is investigated within the framework of linear water wave theory. A channel of infinite horizontal extent but of finite depth is divided into three regions in each of which three different velocity potentials are cons... | Oblique water wave damping by two submerged thin vertical porous plates of different heights | 10.1007/s40314-017-0545-7 |
2018-07-01 | The article deals with an arbitrary elastic 3D-system (body) that performs a controlled finite rotation with respect to some fixed axis and small nonstationary oscillations. The system oscillations occur due to external load (power control) or inertial load of the rotational transportation of the carrying body (kinemat... | Elimination of Nonstationary Oscillations of an Elastic System at the Stopping Time after Finite Rotation by the Given Law via the Tuning of Eigenfrequencies | 10.3103/S0025654418040027 |
2018-07-01 | We study the following second-order differential system 0.1 $$\begin{aligned} -\ddot{u}(t)-M\dot{u}(t)+L(t)u(t)=H_u(t,u(t)),\quad t\in \mathbb {R}, \end{aligned}$$ - u ¨ ( t ) - M u ˙ ( t ) + L ( t ) u ( t ) = H u ( t , u ( t ) ) , t ∈ R , which can be regarded as a second-order Hamiltonian system with a damped term. H... | Multiple Homoclinics for Nonperiodic Damped Systems with Superlinear Terms | 10.1007/s40840-016-0396-1 |
2018-07-01 | Employing a critical point theorem (local minimum result) for differentiable functionals, we prove the existence of at least one non-trivial weak solution for a class of impulsive damped vibration systems under an asymptotical behavior of the nonlinear datum at zero. Two examples are presented to illustrate the feasibi... | Existence Results for Impulsive Damped Vibration Systems | 10.1007/s40840-016-0400-9 |
2018-07-01 | We analyze eigenvalues emerging from thresholds of the essential spectrum of one-dimensional Dirac operators perturbed by complex and non-symmetric potentials. In the general non-self-adjoint setting, we establish the existence and asymptotics of weakly coupled eigenvalues and Lieb–Thirring inequalities. As physical ap... | Eigenvalues of one-dimensional non-self-adjoint Dirac operators and applications | 10.1007/s11005-018-1051-6 |
2018-07-01 | The propagation of weak disturbances in a water–air bubble medium has been studied under the conditions when in addition to the gas (e.g., air) undissolved in water the bubbles contain steam that can convert into water in the process of mixture motion. The air contained in the bubbles will in this case exert diffusion ... | Characteristic Features of Sound Propagation in a Warm Bubble-Laden Water | 10.1007/s10891-018-1809-9 |
2018-07-01 | Chatter is a kind of self-excited vibrations which is related to regenerative effect, mode coupling effect, and process damping, etc. To predict milling chatter more accurately, a suitable dynamical model of milling process which can reflect the practical chatter mechanism should be obtained firstly. In this paper, a n... | Milling stability prediction with simultaneously considering the multiple factors coupling effects—regenerative effect, mode coupling, and process damping | 10.1007/s00170-018-2017-7 |
2018-07-01 | This paper aims at designing an adaptive fractional order fuzzy proportional–integral-derivative controller for seismic control of smart base-isolated structure by means of variable friction dampers (VFD). One main challenge occurs when large displacement of the isolator happens due to near-field motions. To overcome t... | Online tuning of fractional order fuzzy PID controller in smart seismic isolated structures | 10.1007/s10518-017-0294-4 |
2018-06-21 | As the most important thermoplastic and thermosetting modifiers, styrene–butadiene–styrene triblock copolymer (SBS) and epoxy resin have been widely applied in asphalt modifications. In this paper, epoxy SBS-modified asphalts (ESBAs) were prepared with epoxy monomer, curing agent and SBS-modified asphalts (SBAs) with v... | Microstructures, thermal and mechanical properties of epoxy asphalt binder modified by SBS containing various styrene-butadiene structures | 10.1617/s11527-018-1217-9 |
2018-06-11 | The liquid film damping is one of the main technology for the aerospace, navigation, and machine tool. However, the research on the fine boring is very limited. The paper set up the fine boring squeezed liquid film damped system of multi degree of freedom vibration simulation model and solve mathematical model by trans... | Research on fine boring simulation based on squeezed liquid film damper | 10.1186/s13638-018-1164-8 |
2018-06-07 | The appropriate use of energy dissipating devices improves the behavior of structures when subjected to external loads, defining the optimal location of the dampers; therefore, it is crucial to ensure their efficiency. In this work, the mathematical expressions of an efficient and systematic procedure proposed by Takew... | Optimal placement of damping devices in buildings | 10.1007/s40430-018-1238-x |
2018-06-01 | In design and certification of spacecraft, payload/launcher coupled load analyses are performed to simulate the satellite dynamic environment. To obtain accurate predictions, the system damping properties must be properly taken into account in the finite element model used for coupled load analysis. This is typically d... | Experimental validation of solid rocket motor damping models | 10.1007/s12567-017-0191-3 |
2018-06-01 | We modeled a one-dimensional actuator including the Casimir and electrostatic forces perturbed by an external force with fractional damping. The movable electrode was assumed to oscillate by an anharmonic elastic force originated from Murrell–Mottram or Lippincott potential. The nonlinear equations have been solved via... | Anharmonic 1D actuator model including electrostatic and Casimir forces with fractional damping perturbed by an external force | 10.1007/s10409-017-0746-8 |
2018-06-01 | In this paper, we are interested to prove the uniform exponential decay of the energy for the finite difference fully-discretization of 1-D wave equation with an interior damping at $$\xi $$ ξ . To this end, we decompose the fully discrete system into two subsystems: a conservative system, and a non conservative one. W... | Uniform interior stabilization for the finite difference fully-discretization of the 1-D wave equation | 10.1007/s13370-018-0559-3 |
2018-06-01 | In this paper the macroscopic damping model for dynamical behavior of the structures with random polycrystalline configurations at micro–nano scales is established. First, the global motion equation of a crystal is decomposed into a set of motion equations with independent single degree of freedom (SDOF) along normal d... | Macroscopic damping model for structural dynamics with random polycrystalline configurations | 10.1007/s10409-017-0733-0 |
2018-06-01 | This study considers the quasilinear elliptic equation with a damping term, $$\begin{aligned} \text {div}(D(u)\nabla u) + \frac{k(|{\mathbf {x}}|)}{|{\mathbf {x}}|}\,{\mathbf {x}}\cdot (D(u)\nabla u) + \omega ^2\big (|u|^{p-2}u + |u|^{q-2}u\big ) = 0, \end{aligned}$$ div ( D ( u ) ∇ u ) + k ( | x | ) | x | x · ( D ( u ... | Convergence of Radially Symmetric Solutions for (p, q)-Laplacian Elliptic Equations with a Damping Term | 10.1007/s10884-016-9560-4 |
2018-06-01 | The high-damping elastic response spectra have several important applications in evaluating the design of earthquake resistant structures. They are derived from the reference spectrum for damping equal to 5% using the damping reduction factor (DRF). Most damping reduction factors currently used were derived from observ... | Formulation of damping reduction factor for the Algerian seismic code | 10.1007/s42107-018-0023-6 |
2018-06-01 | The study of rotating machines is usually carried out taking into account linearized hydrodynamic forces, considering dynamic coefficients of stiffness and damping, although a high order of nonlinearity can be significantly present in the system. To solve the nonlinear problem, the solution of Reynolds equation is prac... | Discussion about nonlinear boundaries for hydrodynamic forces in journal bearing | 10.1007/s11071-018-4177-2 |
2018-06-01 | Squeeze-film dampers (SFD) are used as indispensable bearings in many rotating machines to suppress lateral vibration and enhance stability. The kinetic energy of the damping fluid is sometimes greater than that of SFD’s journal. Therefore, the influence of the damping fluid must be considered in establishing a dynamic... | Study on the added mass effect in squeeze-film dampers | 10.1007/s12206-018-0544-7 |
2018-06-01 | In this work, a magnetorheological (MR) damper valve is designed with the primary objective of controlling swing-phase damping in an above-knee prosthesis. Initially, a swing phase model of the desired single axis knee incorporating MR damper was modelled. The control parameters that govern damping force and displaceme... | Optimal design of an MR damper valve for prosthetic knee application | 10.1007/s12206-018-0552-7 |
2018-06-01 | In order to analyze the stability of a landfill site, it should analyze some properties of waste introducing the main structural elements. Up to now, it has not been done much research on the properties of municipal solid waste. In addition, due to the differences in waste properties from one country to another and eve... | Effect of confining stress and loading frequency on dynamic behavior of municipal solid waste in Kahrizak landfill | 10.1007/s13762-017-1465-1 |
2018-06-01 | Consider a semilinear hyperbolic boundary value problem associated to the nonlinear generalized viscoelastic equations with Direchlet-Neumann boundary conditions. Then, the global existence of a weak solution is established. The uniqueness of the solution has been obtained by eliminating some hypotheses that have been ... | Semilinear Hyperbolic Boundary Value Problem Associated to the Nonlinear Generalized Viscoelastic Equations | 10.1007/s40306-017-0229-9 |
2018-06-01 | In this paper, the damping property of thermoplastic polyurethane (TPU) was firstly regulated by introducing the phenolic resin (PR) with more active hydroxyl group and larger molecular weight. The mechanism of enhanced damping property was systematically elucidated through the combination of molecular dynamic (MD) sim... | The study of damping property and mechanism of thermoplastic polyurethane/phenolic resin through a combined experiment and molecular dynamics simulation | 10.1007/s10853-018-2218-3 |
2018-06-01 | Dynamic stiffness and damping of epoxy adhesives are critical for ensuring the safety, reliability, and comfort of structures subjected to vibrations and impact loads. This study conducts split Hopkinson pressure bar (SHPB) tests to investigate the synergistic effects of silica micro-nanoparticles on these critical pro... | Synergistic Effects of Mixed Silica Micro-nanoparticles on Compressive Dynamic Stiffness and Damping of Epoxy Adhesive | 10.1007/s40870-018-0148-4 |
2018-06-01 | 目的 液压自由活塞发动机性能受燃油喷射系统开关阀性能限制。本文旨在对开关阀内部结构进行优化,降低液动力,从而提高阀的开启速度。 创新点 1. 提出一种易于安装的带孔阻尼套结构,可以用于改变阀芯表面压力分布和油液射流角,从而降低液动力;2. 建立数值仿真模型,分析阻尼套不同结构和安装参数对液动力和空化的影响。 方法 1. 进行数值模拟,分析阀芯表面压力分布和内部流场分布,并通过实验验证方法有效性和模型准确性;2. 对不同阻尼孔宽度、深度和相对位置下的阀芯液动力和流量损失情况进行对比和分析;3. 对上述不同阻尼孔结构下阀内空化情况进行仿真和对比;4. 建立燃油喷射系统试验台,验证阻尼套对提高阀开启速度的作用。 结论 1. 提出的带孔阻尼... | Experimental and numerical investigation of flow forces in a seat valve using a damping sleeve with orifices | 10.1631/jzus.A1700164 |
2018-06-01 | This paper presents a theoretical model for analyzing the damping effect of underplatform dampers for turbine blades. At first, tangential and normal contact stiffness of the friction damper were studied based on a flat-to-flat contact model. The analytic expressions of contact stiffness were presented. Then, a microsl... | Modeling of Microslip Friction and Its Application in the Analysis of Underplatform Damper | 10.1007/s42405-018-0039-x |
2018-06-01 | A dynamic model of the starting current of an active damper based on a magnetorheological elastomer is described, Experimental data for the damper are derived. | Dynamic Modeling of an Active Damper | 10.3103/S1068798X18060138 |
2018-05-30 | In this paper, we deal with the uniform stabilization to the mixed problem for a nonlinear wave equation and acoustic boundary conditions on a non-locally reacting boundary. The main purpose is to study the stability when the internal damping acts only over a subset $$\omega $$ ω of the domain $$\Omega $$ Ω and the bou... | Uniform stabilization of wave equation with localized internal damping and acoustic boundary condition with viscoelastic damping | 10.1007/s00033-018-0977-y |
2018-05-26 | To obtain a hydraulic damper thermodynamic model that is much more realistic than the thermodynamic model of literature, research is carried out by introducing the stochastic uncertainty theory. The geometric variables of the hydraulic damper are defined as uncertain variables. The stochastic variables are defined with... | Modeling dissipative heating of hydraulic dampers under consideration of stochastic uncertainties in their geometric parameters | 10.1007/s40430-018-1236-z |
2018-05-25 | Based on the kinetic theory, Landau damping of dust acoustic waves (DAWs) propagating in a dusty plasma composed of hybrid nonthermal nonextensive distributed electrons, Maxwellian distributed ions and negatively charged dust grains is investigated using Vlasov-Poisson’s equations. The characteristics of the DAWs Landa... | Landau damping of dust acoustic waves in the presence of hybrid nonthermal nonextensive electrons | 10.1007/s10509-018-3348-4 |
2018-05-23 | The escalating disposal of end-life tires has led to an urgent need for efficient reuse. The positive environmental impact of the application of this material in large-scale civil engineer construction, such as soil-retaining structures, or as seismic isolation technique, stems not only from the reuse of the tires, but... | Dynamic behaviour of granular soil materials mixed with granulated rubber: influence of rubber content and mean grain size ratio on shear modulus and damping ratio for a wide strain range | 10.1007/s41062-018-0156-1 |
2018-05-15 | This paper presents a study of the asymptotic behavior of the solutions for the history value problem of a viscoelastic wave equation which features a fading memory term as well as a supercritical source term and a frictional damping term: $$\begin{aligned} {\left\{ \begin{array}{ll} u_{tt}- k(0) \Delta u - \int \limit... | Energy decay of a viscoelastic wave equation with supercritical nonlinearities | 10.1007/s00033-018-0961-6 |
2018-05-15 | Dynamic analysis of structures often considers the effects of soil–structure interaction which requires estimation of the shear modulus and damping ratio of the soil. While the in situ properties can be measured, the properties of the backfill soils that surround substructures are rarely available at the time of design... | Shear modulus and damping relationships for dynamic analysis of compacted backfill soils | 10.1007/s41062-018-0152-5 |
2018-05-01 | This study is concerned with the nonlinear dynamic characteristics of a micro-vibration fluid viscous damper used in a satellite. When a control moment gyroscope is working, it produces micro-vibrations, which is a disadvantage for imaging equipment. Taking a single-tube micro-vibration fluid viscous damper as our rese... | Nonlinear dynamic characteristics of a micro-vibration fluid viscous damper | 10.1007/s11071-018-4116-2 |
2018-05-01 | Owing to growing environmental awareness in green technology, the whole gamut of engineering sector has started shifting towards natural fibre-oriented materials from synthetic materials. The adequate dynamic stability and damping property are important design necessities in a polymer composite structure. Given this pe... | Investigation of viscoelastic attributes and vibrational characteristics of natural fabrics-incorporated hybrid laminate beams | 10.1007/s00289-017-2139-3 |
2018-05-01 | Cutting forces are critically important in cutting operations because they correlate strongly with cutting performance such as surface accuracy, tool wear, tool breakage, cutting temperature, self-excited, and forced vibrations. The drilling operation of titanium alloys is considered by manufactures as complex and diff... | Numerical modeling and experimental analysis of thrust cutting force and torque in drilling process of titanium alloy Ti6Al4V | 10.1007/s00170-018-1758-7 |
2018-05-01 | The adoption of a reliable shear model for predicting brittle failure modes of a reinforced concrete (r.c.) beam-column joint, beyond ductile flexural mechanisms at member level, is essential to retrofit r.c. framed buildings properly. The retrofitting of existing structures by means of the insertion of hysteretic damp... | Shear modelling of the beam-column joint in the nonlinear static analysis of r.c. framed structures retrofitted with damped braces | 10.1007/s10518-017-0269-5 |
2018-05-01 | The Matsuno–Gill model for the atmospheric steady-state response to an imposed equatorial heat source is perhaps the most successful set of reduced equations in the theory of tropical dynamics. While it was originally designed to explain some key features of the tropical climatology such as the Walker and Hadley circul... | The transient response to an equatorial heat source and its convergence to steady state: implications for MJO theory | 10.1007/s00382-017-3807-6 |
2018-05-01 | The effect of anisotropy and shear strains on the performance of piezoelectric sensors and actuators in active damping of the resonance vibrations of a hinged rectangular plate is studied. To model the vibrations of the plate, Timoshenko’s hypotheses are used. The analytical solution of the problem is obtained by Fouri... | Influence of Anisotropy and Transverse-Shear Strains on the Performance of Piezoelectric Sensors and Actuators | 10.1007/s10778-018-0884-0 |
2018-05-01 | Mechanical joints have considerable effects on dynamic behaviour of machine tools; thus, joint damping identification is important in studying the dynamics of mechanical structures. Due to the difficulties in analysis of microslip friction, the experimental prediction of microslip joint dynamics is of great importance.... | Development of a new method for joint damping identification in a bolted lap joint | 10.1007/s12206-018-0405-4 |
2018-04-25 | In this work, the effect of the damping component with/without individual grooved surface features on the friction-induced vibration and noise (FIVN) and surface wear performance is studied experimentally and numerically. The experimental results show that introducing a grooved damping component in the system has a sig... | Improving Dynamic and Tribological Behaviours by Means of a Mn–Cu Damping Alloy with Grooved Surface Features | 10.1007/s11249-018-1019-9 |
2018-04-16 | A fundamental understanding of frictional sliding at rock surfaces is of practical importance for nucleation and propagation of earthquakes and rock slope stability. We investigate numerically the effect of different physical parameters such as inertia, viscous damping, temperature and normal stress on the chaotic beha... | The effect of inertia, viscous damping, temperature and normal stress on chaotic behaviour of the rate and state friction model | 10.1007/s12040-018-0935-2 |
2018-04-11 | We prove the global non-linear stability, without symmetry assumptions, of slowly rotating charged black holes in de Sitter spacetimes in the context of the initial value problem for the Einstein–Maxwell equations: if one perturbs the initial data of a slowly rotating Kerr–Newman–de Sitter (KNdS) black hole, then in a ... | Non-linear Stability of the Kerr–Newman–de Sitter Family of Charged Black Holes | 10.1007/s40818-018-0047-y |
2018-04-03 | In this research, the application of active mass damper (AMD) has been experimentally tested using electromagnetic uniaxial shake table. The characteristic of an active damper has been presented. A state-feedback controller has been introduced for single flood active mass damper (AMD) using numerical modeling. The mode... | Structural health monitoring of single degree of freedom flexible structure having active mass damper under seismic load | 10.1007/s41062-018-0139-2 |
2018-04-01 | We consider a Navier–Stokes–Voigt fluid model where the instantaneous kinematic viscosity has been completely replaced by a memory term incorporating hereditary effects, in presence of Ekman damping. Unlike the classical Navier–Stokes–Voigt system, the energy balance involves the spatial gradient of the past history of... | Navier–Stokes–Voigt Equations with Memory in 3D Lacking Instantaneous Kinematic Viscosity | 10.1007/s00332-017-9422-1 |
2018-04-01 | In this paper, the empirical models for predicting the modal damping ratio ( $$\xi )$$ ξ ) of impact-damped flexible beams (IDFB) via gene expression programming (GEP) are proposed. The experimental data used in training and testing phases of the GEP are obtained from the literature. The training and testing sets of th... | Empirical Modeling of Modal Damping Ratio of Impact-Damped Flexible Beams by GEP | 10.1007/s13369-017-2715-8 |
2018-04-01 | The present study examines the possibility of attenuating blood pulses by means of introducing prosthetic viscoelastic materials able to absorb energy and damp such pulses. Vascular prostheses made of polymeric materials modify the mechanical properties of blood vessels. The effect of these materials on the blood pulse... | Arterial pulse attenuation prediction using the decaying rate of a pressure wave in a viscoelastic material model | 10.1007/s10237-017-0980-9 |
2018-04-01 | This paper presents an integrated passive damping approach in hybrid metal-CFRP parts for structural applications. In this concept a viscoelastic material is embedded in the joint zone of the hybrid component. To examine the connection strength single-lap-joint specimens were produced and tested and the influence of th... | Intrinsic CFRP-metal-hybrids with rubber interface for the improvement of the damping behaviour | 10.1007/s11740-018-0792-5 |
2018-04-01 | During the last 2 decades experimental and theoretical studies have striven to evaluate the use of granulated rubber as a construction material in civil engineering applications. Several geotechnical structures using soil/rubber mixtures or clean granulated rubber proved the efficiency of this solution. In the framewor... | Dynamic Behaviour of Granular Soil Materials Mixed with Granulated Rubber: Effect of Rubber Content and Granularity on the Small-Strain Shear Modulus and Damping Ratio | 10.1007/s10706-017-0391-9 |
2018-04-01 | In our increasingly unstable and unpredictable world, population dynamics rarely settle uniformly to long-term behaviour. However, projecting period-by-period through the preceding fluctuations is more data-intensive and analytically involved than evaluating at equilibrium. To efficiently model populations and best inf... | Inferring transient dynamics of human populations from matrix non-normality | 10.1007/s10144-018-0620-y |
2018-04-01 | Tuned Liquid Column Damper (TLCD) relies on the motion of a liquid mass in an open tube counteract the external motion, while a built-in orifice plate induces turbulent damping forces that dissipate kinetic energy. Although both the construction and working principle of TLCD differ from Tuned Mass Damper (TMD), the ana... | Transforming Method of TLCD-structure to TMD-structure for Vibration Control | 10.1007/s12205-017-0287-5 |
2018-04-01 | In this article, a new magneto rheological (MR) sponge damper is proposed for suppression of vibrations in a washing machine. The article presents design optimization of geometric parameters of MR sponge damper (MRSD) using the finite element analysis (FEA) and first order derivative techniques for a washing machine. T... | Design and analysis of a new magneto rheological damper for washing machine | 10.1007/s12206-018-0308-4 |
2018-04-01 | The railway bogie, the most important running component, has direct association with the dynamic performance of the whole vehicle system. The bifurcation type of the bogie that is affected by vehicle parameters will decide the behavior of the vehicle hunting stability. This paper mainly analyzes the effect of the yaw d... | Hopf bifurcation analysis of railway bogie | 10.1007/s11071-017-3634-7 |
2018-03-13 | In this paper, we are interested in the following damped vibration system: where B is an antisymmetric $$N\times N$$ N × N constant matrix, $$q:{\mathbb {R}}\longrightarrow {\mathbb {R}}$$ q : R ⟶ R is a continuous function, $$L(t)\in C({\mathbb {R}},{\mathbb {R}}^{N^{2}})$$ L ( t ) ∈ C ( R , R N 2 ) is a symmetric mat... | On Ground-State Homoclinic Orbits of a Class of Superquadratic Damped Vibration Systems | 10.1007/s00009-018-1097-9 |
2018-03-12 | This work is concerned with the Dirichlet initial boundary problem for a semilinear viscoelastic wave system with nonlinear weak damping and source terms. For nonincreasing positive functions g and h, we show the finite time blow-up of some solutions whose initial data have arbitrarily high initial energy. | Blow-up of arbitrarily positive initial energy solutions for a viscoelastic wave system with nonlinear damping and source terms | 10.1186/s13661-018-0951-9 |
2018-03-01 | In the framework of discrete element method, a new damping model is introduced. Unlike the global mass-damping, the new model applies an approximately equal damping ratio to all particles in a granular assembly. This model does not require exact stiffness calculations, hence not involved in the unnecessary cost. The ne... | Size-dependent damping model for DEM: improved equilibrium compared with mass-damping at no extra computational cost | 10.1007/s10035-018-0794-1 |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.