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2019-01-01 | We address the problem of a transition front propagation in chains with a bi-stable nondegenerate on-site potential and a nonlinear gradient coupling. For a generic nonlinear coupling, one encounters a special regime of transitions, characterized by extremely narrow fronts, far supersonic velocities of the front propag... | Shockwaves and Kinks in Exothermic Nonlinear Chains | 10.1007/978-3-319-92234-8_19 |
2019-01-01 | The paper treats the control problem of the locomotion phases in a jumping cycle of a robot. The mechanical architecture of the leg with elastic lower segment (ATHLETE MODEL) is discussed. The dynamic model of the motion in stance phase is determined. The touch-down sequence, when the elastic foot hits the ground, is d... | Hybrid Control Strategies for Jumping Robots | 10.1007/978-3-030-00232-9_20 |
2019-01-01 | A major decisive task in power system stability enhancement is optimal setting of damping controller parameters. This work proposes small signal stability enhancement of power system using UPFC-based optimal PI-lead-lag controller, whose parameters are optimized by modified Grey Wolf Optimizer technique. Lead-lag struc... | Small Signal Stability Enhancement of Power System by Modified GWO-Optimized UPFC-Based PI-Lead-Lag Controller | 10.1007/978-981-13-1595-4_21 |
2019-01-01 | Metal mesh isolator is made of metallic wires. It has been widely used in vibration control engineering applications such as isolation mounting of machine tools. To investigate the performance of the metallic wires material, a set of dynamic tests was conducted for a range of frequencies and amplitudes of loading. The ... | Experimental Characterization of Metal-Mesh Isolator’s Damping Capacity by Constitutive Mechanical Model | 10.1007/978-3-030-11220-2_24 |
2019-01-01 | The hydrodynamic bearings are used to support rotors for their high loading capacity, simple design, and quiet operation. To increase stability limit of lateral vibration of rotating machines, the hydrodynamic bearings are combined with classical squeeze film dampers. This technological solution is widely used to suppo... | Controllable magnetically sensitive rotor support element for reducing oscillation and force transmission | 10.1007/978-3-030-20131-9_334 |
2019-01-01 | This chapter presents the validity of the extended rod theory proposed in the previous chapter to various high-rise buildings. The effectiveness of the extended rod theory proposed here is examined by comparing with the numerical results obtained from NASTRAN (MSC Software Corporation) and SNAP (Structural Systems, Inc... | Simplified Analysis of High-Rise Buildings by the Extended Rod Theory | 10.1007/978-981-13-7185-1_5 |
2019-01-01 | Large amplitude vibrations from hand held impact machines might bring serious health problems for users in long term. Here, a vibration absorber which works based on the nonlinear tuned mass damper concept is applied to mitigate unpleasant vibrations in a hand held impact machine. A global sensitivity analysis is carri... | Pareto Optimization of a Nonlinear Tuned Mass Damper to Control Vibrations in Hand Held Impact Machines | 10.1007/978-3-319-74280-9_4 |
2019-01-01 | Metallic yielding device is one of the passive energy dissipation devices. It has good energy dissipation capacity, high initial stiffness along with high ductility. In this study, 0.4-scale single-story single-bay non-ductile gravity load design frame has been tested under cyclic load; later on, the damaged frame has ... | Numerical Evaluation of Cyclic Performance of Damaged RC Frames Using Passive Devices | 10.1007/978-981-13-0365-4_58 |
2019-01-01 | The trends in the automotive field aim at providing all users with a high level of safety and a high degree of comfort. Current technologies combine increasingly judicious optimal control of most systems in the their componing. Thus, the highest level electronic equipment permanently adjusts the various systems and sub... | Experimental Research on the Use of MRD to Reduce Shocks and Vibrations in Light Car Seats | 10.1007/978-3-319-94409-8_19 |
2019-01-01 | Bolts, screws, rivets, and pins can significantly complicate the prediction of damping, stiffness, and resonance frequencies of built-up systems. Because the interaction of interfacial joints is not well understood, current predictive models incorporating fastened joints often require over-designing for safety. To bett... | Acoustic Excitation of a Flanged Joint | 10.1007/978-3-319-74280-9_23 |
2019-01-01 | In this work, we investigate the possibility of using a piezoelectric element connected to an external electric RL-circuit for passive vibrations damping of a cantilevered plate interacting with a quiescent fluid. The behavior of piezoelectric elements is described by the equations of electrodynamics of deformable elec... | Damping of Hydroelastic Vibrations of the Plate Using Shunted Piezoelectric Element. Part I: Numerical Model | 10.1007/978-3-030-21894-2_63 |
2019-01-01 | Floating offshore wind turbines are envisaged to undergo a significant development in the near future, due to their advantages with respect to the onshore or nearshore counterparts, in terms of greater available wind power, reduction of the land occupation and minimization of the visual impact of the turbines. Although... | Experimental Study on Heave and Yaw Motions of a 1:30 Spar Support for Offshore Wind Turbines | 10.1007/978-981-13-3134-3_63 |
2019-01-01 | Purposes: This paper aims to clarify the effects of the changes in detection probe external damping resistance on the transient electromagnetic method and detect the trenchless underground pipeline corrosion resolution. Methods and Process: A corrosion model was designed, multiple sets of tests were performed indoors, ... | Influence of Probe External Resistance on the Detection of Buried Pipeline Corrosion Through Transient Electromagnetic Method | 10.1007/978-981-10-7560-5_113 |
2019-01-01 | The results of solving the problem of finding the optimal synthesizing control function of the damping process in the vibration isolation system are given. It is established that the optimal control determines the intermittent damping process. The damper is activated when the sign of the object’s speed changes and is s... | Control of Damping Process in System of Vibration Isolation | 10.1007/978-3-319-95630-5_37 |
2019-01-01 | Damping and vibration protection systems of equipment are necessary for industrial applications. In many respects, the existing fluid supports’ constructions for damping and vibration damping meets the requirements of industrial standards; they have some limitations and constructive disadvantages. The use of magnetorhe... | Hardware Implementation of Automatic Control System for New Generation Magnetorheological Supports | 10.1007/978-3-319-95630-5_239 |
2019-01-01 | The paper presents a problem of soldiers’ lower limbs safety in military vehicles during high impact loads derived from explosion of Improvised Explosion Devices (IED) charges. The numerical studies concerned the function of combat boots as an element of the soldier’s equipment. The model of a lower limb with cooperati... | Analysis of the Lower Limb Model Response Under Impact Load | 10.1007/978-3-319-97286-2_14 |
2019-01-01 | ZJUNlict became the Small Size League Champion of RoboCup 2019 with 6 victories and 1 tie for their 7 games. The overwhelming ability of ball-handling and passing allows ZJUNlict to greatly threaten its opponent and almost kept its goal clear without being threatened. This paper presents the core technology of its ball... | Champion Team Paper: Dynamic Passing-Shooting Algorithm of the RoboCup Soccer SSL 2019 Champion | 10.1007/978-3-030-35699-6_39 |
2019-01-01 | This paper investigates the effects of mixing ratio, cement content and curing time on the transient electrical and mechanical properties of sand-cement-inorganic binder mixture adopting two non-destructive testing (NDT) methods, electrical resistivity (ER) test and Free Free resonant Column test (FFRC). Due to the env... | Geophysical Properties of Sand-Cement-Inorganic Binder Mixture: Electrical Resistivity and Elastic Wave Velocity | 10.1007/978-3-319-95759-3_9 |
2019-01-01 | Prosthetic knee is the most important component of lower limb prosthesis. This work aims to design a novel knee joint prosthesis and provide theoretical model of the hydraulic microprocessor-controlled prosthetic knee. The intelligent knee prosthesis with hydraulic damper is designed. Innovative valve structure is prop... | Structure Design and Motion Simulation of a Microprocessor-Controlled Prosthetic Knee | 10.1007/978-981-13-2481-9_14 |
2019-01-01 | This paper presents the possibility to apply distributed vibration absorbers to reduce the vibration amplitude in axially symmetric components. The kind of metastructures here presented does not require complicated and expensive production processes such as additive manufacturing, but can be manufactured with more conv... | On the Implementation of Metastructures in Rotordynamics | 10.1007/978-3-319-74693-7_5 |
2019-01-01 | Rigid-body resonances used to be the only known vibration phenomena to occur in washing machines. However, lately there have been unexpected incidences of excessive, self-destructive vibrations. It is not clear how these incidents can be explained and reliably prevented. It is presumed that design changes evoke or shif... | Rotordynamic Instabilities in Washing Machines | 10.1007/978-3-319-99268-6_27 |
2019-01-01 | Despite the hundreds of wind tunnel studies executed every year on tall- and super-tall buildings globally, the number of full-scale measurements conducted on these structures is still somewhat limited. Full-scale measurements, even for a short duration, have in fact tremendous value as they can be used to validate the... | Full-Scale Measurements of the Structural Response of a 63-Storey Mixed-Use High-Rise Under Wind Loading | 10.1007/978-3-030-12815-9_13 |
2019-01-01 | Design optimization has already become an important tool in industry. The benefits are clear, but several drawbacks are still present, being the main one the computational cost. The numerical simulation involved in the solution of each evaluation is usually costly, but time and computational resources are limited. Time... | Industrial Application of Genetic Algorithms to Cost Reduction of a Wind Turbine Equipped with a Tuned Mass Damper | 10.1007/978-3-319-89890-2_27 |
2019-01-01 | A well-designed SFD must deliver enough damping to aid in decreasing rotor amplitudes of motion. Piston rings (PRs) and O-rings (ORs) are commonly used as end seals in dampers for commercial and military gas turbine engines, respectively. The paper details dynamic load tests conducted on a short length SFD ( L / D = 0... | Effect of Lubricant Supply Pressure on SFD Performance: Ends Sealed with O-rings and Piston Rings | 10.1007/978-3-319-99262-4_26 |
2019-01-01 | The helicopter rotor lead-lag damper dynamic characteristic modeling has the important role and significance for helicopter rotor system dynamic analysis in all three major research fields that are structural loads, motion response and system stability. The difficult part of this work is the variety of dampers means di... | Helicopter Lead-Lag Damper Modeling Using Fractional Derivative Methods | 10.1007/978-981-13-3305-7_236 |
2019-01-01 | In this article, modelling of the magnetorheological (MR) damper and its finite element analysis (FEA) is presented. The axisymmetric FEM (finite element method) model of the MR damper was built using ANSYS Maxwell software. The MR damper was modelled using the geometrical parameters which were selected using the liter... | Modelling and Analysis of Magneto-Rheological Damper for Maximizing the Damping Force | 10.1007/978-981-13-6469-3_7 |
2019-01-01 | Vibrations, considered one of the major problems in the engineering applications, are analyzed to predict their detrimental effects on the equipment and structures. The metal mesh isolator has become widely applied to mitigate the disturbing vibration due to its special production techniques. The metal mesh isolator is... | Experimental Investigation of Normal/Lateral Excitation Direction Influence on the Dynamic Characteristics of Metal Mesh Isolator | 10.1007/978-3-319-94616-0_23 |
2019-01-01 | Brake squeal is a typical problem of “Noise, Vibration, Harshness” (NVH) phenomena in the automotive world leading to potential customer complaints. This high frequency noise in the audible frequency range of approximately 1 kHz to 15 kHz is induced by self excitation resulting from the frictional contact between brake... | On Brake Pad Shim Characterization: a Homogenization Approach and Finite Element Analysis | 10.1007/978-3-030-13307-8_30 |
2019-01-01 | The present study focuses on a means of improving the performance of transmission towers under high-intensity winds in the form of cyclonic winds through the use of shape memory alloy (SMA) dampers installed in the bracings of the tower. The cyclonic wind field is modelled as per the guidelines of the World Meteorologi... | Cyclone Wind Response Mitigation of Transmission Towers by SMA Dampers | 10.1007/978-981-13-0365-4_35 |
2019-01-01 | In this study, a new graphical user interface (GUI), VC4OWT, is developed to evaluate the structural response of National Renewable Energy Laboratory (NREL) 5-MW offshore wind turbine (OWT) subjected to seismic excitations. Finite element model of OWT has been modelled and analyzed using the Opensees simulation platfor... | VC4OWT: MATLAB Interface for Vibration Control of Offshore Wind Turbine | 10.1007/978-981-13-2306-5_75 |
2019-01-01 | Small-scale, quickly executed modal surveys can yield an incredible amount of useful information. Electrodynamic shakers and especially impact hammers have been the excitation methods of choice for these tests because of their ease of use. However, large low-frequency structures with highly damped modes are difficult t... | Using Manual Excitation for Large Displacement on a Highly Damped System | 10.1007/978-3-319-74700-2_30 |
2019-01-01 | The paper deals with the analytical investigation of the behaviour of the harmonically excited physical pendulum suspended on the nonlinear spring. The asymptotic method of multiple scales (MS) has been used to derive approximate solutions in the analytical form. The applied approach allows one to perform a qualitative... | Plane Motion of a Rigid Body Suspended on Nonlinear Spring-Damper | 10.1007/978-3-319-92234-8_10 |
2019-01-01 | Most of the studies on the control of building frame using MR damper are investigated for far-field earthquake records, and a considerable reduction in responses is shown. However, MR dampers have some significant drawbacks like the saturation of MR dampers and its performance variability with respect to the ground mot... | Performance of Semi-actively Controlled Building Frame Using MR Damper for Near-Field Earthquakes | 10.1007/978-981-13-0365-4_34 |
2019-01-01 | Many lightly damped flexible structures suffer from unwanted vibrations. Typically a tuned-mass-damper (TMD) can be used to reduce unwanted vibrations of a specific mode of vibration. The inerter is a novel passive vibration control device offering a wide range of potential applications in engineering practice. It has ... | The Realisation of an Inerter-Based System Using Fluid Inerter | 10.1007/978-3-319-74421-6_16 |
2019-01-01 | It is a well-known fact that soil–structure interaction plays vital role in governing the response of building during seismic activities. Also, for better stability of buildings during earthquakes, energy dissipation devices are widely used. This paper is an attempt to gather the work done by researcher to study the in... | A Review on: ‘Performance of Friction Damper for Response Control of Buildings Considering Effect of Soil–Structure Interaction’ | 10.1007/978-981-13-6148-7_34 |
2019-01-01 | This paper investigates the potential of tuned mass dampers (TMDs) coupled with inerter devices in different tuned mass dampers inerter (TMDI) topologies to dissipate oscillations in tall buildings due to vortex shedding in the across wind direction while generating electric energy. The TMDI is first optimized for mini... | Simultaneous Vibration Suppression and Energy Harvesting in Wind Excited Tall Buildings Equipped with the Tuned Mass Damper Inerter (TMDI) | 10.1007/978-3-030-12815-9_42 |
2019-01-01 | This article introduces a new type of active damper—elastic support/dry friction damper (ESDFD) for vibration control of rotor systems and its performances. The basic operation principle of ESDFD in rotor system was introduced. In particular, a two-dimensional friction model-ball/plate model was proposed, by which a dy... | An Active Elastic Support/Dry Friction Damper: New Modeling and Analysis for Vibration Control of Rotor Systems | 10.1007/978-3-319-99270-9_2 |
2019-01-01 | This paper focuses on constructing a Matlab/Simulink program of vibration model with 2 DOF horizontal washing machine. The key point of this paper is using a strong nonlinear friction force - velocity (F-V) relationship of dampers which is obtained from experiment as an input for the simulation. The suitability and hig... | The Effect of Damper Configurations on the Vibration of Horizontal Washing Machines | 10.1007/978-3-030-04792-4_40 |
2019-01-01 | Today, a number of researchers are broadly studying the effective implementation of supplemental seismic energy dissipation systems to improve seismic behavior of structures during earthquakes. The current article studies the impacts of employing Viscous Wall Damper devices to couple two adjacent structures on seismic ... | Preventing Seismic Pounding of Adjacent Structures Using Viscous Wall Damper Device | 10.1007/978-981-10-8016-6_44 |
2019-01-01 | The energetic boundary element method (BEM) is a discretization technique for the numerical solution of wave propagation problems, introduced and applied in the last decade to scalar wave propagation inside bounded domains or outside bounded obstacles, in 1D, 2D, and 3D space dimension. The differential initial-boundar... | Energetic BEM for the Numerical Solution of 2D Hard Scattering Problems of Damped Waves by Open Arcs | 10.1007/978-3-030-04088-8_14 |
2018-12-15 | The understanding of physical processes over submerged reefs represents an important ongoing research topic when considering wave energy dissipation and coastal protection that these environments provide. Detailed analyses are required to assess wave damping based on the contribution of reef roughness and wave breaking... | CFD modelling of wave damping over a fringing reef in the Colombian Caribbean | 10.1007/s00338-018-1736-4 |
2018-12-13 | We consider a system of acoustic wave equation possessing lower-order perturbation terms in a bounded domain in R 2 $\mathbb{R}^{2}$ . In this paper, we show the system is well-posed and stable with energy decays introducing a local discontinuous Galerkin (LDG) method. Also, we study an a priori L 2 $L^{2}$ -norm error... | Error estimates of a semi-discrete LDG method for the system of damped acoustic wave equation | 10.1186/s13662-018-1919-x |
2018-12-07 | The global LR04 δ^18O, the tropical ODP Site 846 sea surface temperature (SST), and the global ΔSST stack records were investigated using the advanced method for time-series decomposition singular spectrum analysis to outline the quantitative role of orbital forcings and to investigate the nonlinear dynamics of the Pli... | δ^18O and SST signal decomposition and dynamic of the Pliocene-Pleistocene climate system: new insights on orbital nonlinear behavior vs. long-term trend | 10.1186/s40645-018-0236-z |
2018-12-01 | In nonlinear dynamic analysis, damping models are used to represent the un - modelled dissipation. Till now, majority of nonlinear dynamic analysis tools for seismic engineering uses the classical Rayleigh damping and its variations. Though these models perform well in linear dynamic analysis, their adaptation to nonli... | Application of local elasticity continuum damping models in nonlinear dynamic analysis | 10.1007/s10518-018-0424-7 |
2018-12-01 | In order to have a more generic representation of the damping phenomenon in seismic analysis of structures, in this paper, the already existing nonlocal elasticity continuum damping models have been adapted and extended to the inelastic domain. Adaptations of two nonlocal elasticity based damping models, Russell’s spat... | Application of nonlocal elasticity continuum damping models in nonlinear dynamic analysis | 10.1007/s10518-018-0412-y |
2018-12-01 | We consider the 2D Navier–Stokes equation on $$\mathbb T \times \mathbb R$$ T × R , with initial datum that is $$\varepsilon $$ ε -close in $$H^N$$ H N to a shear flow ( U ( y ), 0), where $$\Vert U(y) - y\Vert _{H^{N+4}} \ll 1$$ ‖ U ( y ) - y ‖ H N + 4 ≪ 1 and $$N>1$$ N > 1 . We prove that if $$\varepsilon \ll \nu ^{1... | The Sobolev Stability Threshold for 2D Shear Flows Near Couette | 10.1007/s00332-016-9330-9 |
2018-12-01 | The movement of the simplest model of a statically unbalanced rotor under the condition of the action of a constant external torque is considered, taking into account the forces of external and internal damping. Two modes of stationary motion of the rotor are investigated: synchronous whirling and asynchronous self-exc... | Synchronous Whirling and Self-oscillations of a Statically Unbalanced Rotor in Limited Excitation | 10.3103/S0025654418050047 |
2018-12-01 | We consider an optimization problem related to semi-active damping of vibrating systems. The main problem is to determine the best damping matrix able to minimize influence of the input on the output of the system. We use a minimization criteria based on the ℋ 2 $\mathcal {H}_{2}$ system norm. The objective function is... | Damping optimization of parameter dependent mechanical systems by rational interpolation | 10.1007/s10444-018-9605-9 |
2018-12-01 | This paper is concerned with long-time dynamics of laminated beams modeled from the well established Timoshenko system. Of particular interest is a model of two-layered beam proposed by Hansen and Spies which describes the slip effect produced by a thin adhesive layer uniting the structure. In a more general setting, i... | Dynamics of Laminated Timoshenko Beams | 10.1007/s10884-017-9604-4 |
2018-12-01 | This paper improves upon experience mapping based predictive controller (EMPC) for an under-damped type 1 system which is a fairly new concept presented in literature. EMPC has been earlier demonstrated for an under-damped type 1 system. However, the earlier EMPC controller did not address changes in system parameters ... | Adaptive experience mapping based predictive controller for under-damped type 1 systems | 10.1007/s40435-018-0396-0 |
2018-12-01 | In this communication, we propose a nonlocal fractional viscoelastic model of a nanobeam resting on the fractional viscoelastic foundation and under the influence of the longitudinal magnetic field and arbitrary number of attached nanoparticles. Size effects are taken into account using the differential form of the non... | Fractional-order model for the vibration of a nanobeam influenced by an axial magnetic field and attached nanoparticles | 10.1007/s00707-018-2263-7 |
2018-12-01 | The machining of complex geometries and deep cavities requires the use of long projecting tool holders. However, due to their high length-to-diameter ratio, these tool holders have a high degree of static and dynamic compliance. High dynamic compliance reduces process stability and thus productivity. A new approach to ... | Frictionally damped tool holder for long projection cutting tools | 10.1007/s11740-018-0847-7 |
2018-12-01 | A precise tangential contact damping model is proposed, which includes the lateral contact of the upper–lower asperities and the interaction of adjacent asperities. The effects of the normal static preload, frequency, and amplitude of tangential displacement on the tangential contact damping were analyzed by simulation... | A Model of Tangential Contact Damping Considering Asperity Interaction and Lateral Contact | 10.1007/s10338-018-0050-6 |
2018-12-01 | A regenerative semi-active control system based on self-tuning Fuzzy proportional-derivative (PD) control strategy is applied to suppress the vortex-induced vibrations (VIV) of an elastically supported circular cylinder at low Reynolds numbers. Of particular interest was the effect of control parameter and capacitance ... | Regenerative semi-active vortex-induced vibration control of elastic circular cylinder considering the effects of capacitance value and control parameters | 10.1007/s12206-018-1104-x |
2018-12-01 | Gravity waves are prominent physical features that play a fundamental role in transport processes of stratified aquatic ecosystems. In a two-layer stratified basin, the equations of motion for the first vertical mode are equivalent to the linearised shallow water equations for a homogeneous fluid. We adopted this frame... | Evolution and decay of gravity wavefields in weak-rotating environments: a laboratory study | 10.1007/s10652-018-9609-5 |
2018-12-01 | The use of CFRP transmission shaft has positive effect on the weight and flexural vibration reduction of drive-line system. However, the application of CFRP transmission shaft will greatly reduce the torsional stiffness of the drive-line, and may cause strong transient torsional vibration. Which will seriously affect t... | Study on Forced Torsional Vibration of CFRP Drive-Line System with Internal Damping | 10.1007/s10443-017-9668-7 |
2018-12-01 | An economical solution to reduce building motions to an acceptable level, under dynamic loadings, is to provide additional damping. A passive damping device shown to be effective as a vibration control mechanism is tuned liquid damper (TLD). A TLD is a passive control system which utilizes fluid-sloshing motion to diss... | Seismic performance evaluation of steel frame structures equipped with tuned liquid dampers | 10.1007/s42107-018-0082-8 |
2018-12-01 | Timber structures are characterized by a pinching phenomenon that leads to reduced dissipative capability. A few hysteretic models have been proposed to simulate the mechanical behavior of timber structures, among which the one composed of a bilinear element and a slip element in parallel has been popular in practice. ... | Optimum hysteretic damper design for multi-story timber structures represented by an improved pinching model | 10.1007/s10518-018-0437-2 |
2018-12-01 | Chatter is a very common phenomenon and severely affects the productivity and quality of workpiece during milling. However, it is very difficult and expensive to suppress chatter directly in machining. The main method involves avoiding chatter by predicting chatter stability. Tool wear is a difficult and unavoidable pr... | Prediction of time-varying chatter stability: effect of tool wear | 10.1007/s00170-018-2582-9 |
2018-12-01 | An integrated optimal structural design method for a diagrid structure and control device was developed. A multi-objective genetic algorithm was used and a 60-story diagrid building structure was developed as an example structure. Artificial wind and earthquake loads were generated to assess the wind-induced and seismi... | MOGA-Based Structural Design Method for Diagrid Structural Control System Subjected to Wind and Earthquake Loads | 10.1007/s13296-018-0055-5 |
2018-12-01 | The main role of the suspension system is to achieve ride comfort by reducing vibrations generated by the road roughness. The active damper is getting much attention due to its reduced cost and ability to enhance ride comfort especially when the road ahead is measurable by an environment sensor. In this study a preview... | Development of Preview Active Suspension Control System and Performance Limit Analysis by Trajectory Optimization | 10.1007/s12239-018-0097-x |
2018-12-01 | The synergy between Mantua Diocese, Direzione Regionale per i beni culturali e paesaggistici della Lombardia and Politecnico di Milano enabled the elaboration of a strategic conservation plan for some Mantova buildings of great significance to the city and to the owners: the planning of monitoring activities necessary ... | Monitoring as strategy for planned conservation: the case of Sant’Andrea in Mantova (Mantua) | 10.1007/s12518-018-0240-4 |
2018-12-01 | Hysteresis steel dampers are widely used in earthquake-resistant structures, where some of them are anisotropic and capable of sustaining earthquake-induced bidirectional deformation. In this paper, a simplified analytical model is proposed for simulating the hysteretic behavior of U-shaped steel dampers with horizonta... | A simplified analytical model for U-shaped steel dampers considering horizontal bidirectional deformation | 10.1007/s10518-018-0407-8 |
2018-12-01 | Tuned mass dampers (TMDs) are a subclass of dynamic vibration absorbers that consist of a mass-spring-damper unit that is attached to a structure to adjust its response to seismic and wind loads. The efficacy, performance and optimum design of a TMD strongly depend not only on its mass, stiffness and damping as well as... | Seismic energy dissipation-based optimum design of tuned mass dampers | 10.1007/s00158-018-2033-0 |
2018-11-27 | Temperature is one of the variables that influence the elasto-plastic behavior and integrity of rock outcrops. Fluctuations in temperature can trigger alteration of some of the mineral properties and impact the brittle-plastic transition. Initiation and propagation of thermally induced tension cracks tend to weaken mos... | Effect of heat treatment on dynamic properties of selected rock types taken from the Salt Range in Pakistan | 10.1007/s12517-018-4058-5 |
2018-11-21 | We study a nonlocal evolution equation modeling the deformation of a bridge, either a footbridge or a suspension bridge. Contrarily to the previous literature, we prove the exponential asymptotic stability of the considered model with a small amount of damping (namely, on a small collar around the whole boundary) which... | Stabilization of a suspension bridge with locally distributed damping | 10.1007/s00498-018-0226-0 |
2018-11-21 | A keen interest towards technological implications of spin-orbit driven magnetization dynamics requests a proper theoretical description, especially in the context of a microscopic framework, to be developed. Indeed, magnetization dynamics is so far approached within Landau-Lifshitz-Gilbert equation which characterizes... | Another view on Gilbert damping in two-dimensional ferromagnets | 10.1038/s41598-018-35517-x |
2018-11-20 | We consider the Cauchy problem of the semilinear wave equation with a damping term $$\begin{aligned} \left\{ \begin{array}{ll} u_{tt} - \Delta u + c(t,x) u_t = |u|^p,&{}(t,x)\in (0,\infty )\times {\mathbb {R}}^N,\\ u(0,x) = \varepsilon u_0(x), \quad u_t(0,x) = \varepsilon u_1(x),&{} x\in {\mathbb {R}}^N, \end{array}\ri... | Critical exponent for the semilinear wave equations with a damping increasing in the far field | 10.1007/s00030-018-0546-2 |
2018-11-12 | Computing is not understanding. This is exemplified by the multiple and discordant interpretations of Landau damping still present after 70 years. For long deemed impossible, the mechanical N -body description of this damping, not only enables its rigorous and simple calculation, but makes unequivocal and intuitive its... | Basic microscopic plasma physics from N-body mechanics | 10.1007/s41614-018-0021-x |
2018-11-01 | Along with the increasing penetration of distributed generation with voltage-source converters (VSCs), there are extensive concerns over the potential virtual rotor angle stability, which is characterized by oscillations of power and frequency during the dynamic process of synchronization in the grid. Several control s... | Modeling framework of voltage-source converters based on equivalence with synchronous generator | 10.1007/s40565-018-0433-1 |
2018-11-01 | Abstract —A study of the temperature and frequency dependences of the mechanical loss factors and elastic moduli of polymeric materials allows one to calculate the efficiency of vibration-damping coatings on substrates of metals and rigid composites under specified operating conditions. The calculated and experimental ... | Temperature and Frequency Dependences of Dissipative Properties of Rigid Vibration-Damping Coatings | 10.1134/S2075113318060151 |
2018-11-01 | The damping modification factors are utilized to alter the design spectral ordinates for constructions whose damping differs significantly from 5%, this being the level that is routinely considered by most codes. Such factors are habitually evaluated after suites of historical inputs representing the local seismicity. ... | Generating damping modification factors after artificial inputs in scenarios of local records scarcity | 10.1007/s10518-018-0406-9 |
2018-11-01 | This work is concerning with the study of the thermoelastic damping of a nanobeam resonator in the context of the two-temperature generalized thermoelasticity theory. An explicit formula of thermoelastic damping has been derived when Young’s modulus is a function of the reference temperature. Influences of the beam hei... | The reference temperature dependence of Young’s modulus of two-temperature thermoelastic damping of gold nano-beam | 10.1007/s11043-017-9365-9 |
2018-11-01 | Particles impact damping is one of the promising technologies used for the passive mitigation of vibrations. Through the dynamic impact and friction between particles, particles impact damper is able to reduce or eliminate vibratory energy under kinetic shape. Due to the simplicity of this type of damper and the operat... | Design parameters optimization of a particles impact damper | 10.1007/s12008-018-0463-y |
2018-11-01 | Background Global agriculture is undergoing a phase of agroecological transition. This transition will be characterized by adoption of agroecological cropping practices and by an increased diversity of soil management/tillage practices. However, very little is known as to whether or not crop seed germination and seedli... | Abiotic and biotic factors affecting crop seed germination and seedling emergence: a conceptual framework | 10.1007/s11104-018-3780-9 |
2018-11-01 | High rotating speed milling operation is the most essential mean of implementing high-speed milling. To improve and enhance the dynamic performances of cutting system, a large number of creative spindle-tool systems with high damping performance are designed and applied, in which larger rotational damping (or internal ... | Influence of rotational damping on stability in end milling processes | 10.1007/s00170-018-2554-0 |
2018-11-01 | Abstract Fuel consumption control in a combustion chamber of an air-breathing engine is carried out by a metering device (dispenser). The metering needle of the dispenser is driven by a hydraulic cylinder. The hydraulic cylinder is controlled by a spool-valve amplifier of an electromechanical device. The idea of fuel c... | A Way to Design an Adaptive Fuzzy Controller for the Dispenser Position of an Air-Breathing Engine | 10.3103/S1068371218110068 |
2018-11-01 | The power system dynamic response is impacted by uncertainties in the system operation such as load variation and large penetration of intermittent generation. This paper presents a method based on the solution of the nonlinear Riccati equation for the design of coordinated robust damping controllers for power systems.... | Robust design of coordinated decentralized damping controllers for power systems | 10.1007/s00170-018-2646-x |
2018-11-01 | Users of structural analysis software commonly apply the Rayleigh damping model as a default option for analyzing of structures. When a distributed plasticity model is utilized in the numerical models, the structural responses are not found to be sensitive to the damping models; even the Rayleigh damping model leads to... | Selection of Viscous Damping Model for Evaluation of Seismic Responses of Buildings | 10.1007/s12205-018-0860-6 |
2018-11-01 | This study dealt with investigating the seismic performance of the smart and shape memory alloy (SMA) and magnets plus rubber-spring (MRS) dampers and their effects on the seismic resistance of multiple-span simply supported bridges. The rubber springs in the MRS dampers were pre-compressed. For this aim, a set of expe... | Investigation of MRS and SMA Dampers Effects on Bridge Seismic Resistance Employing Analytical Models | 10.1007/s13296-018-0125-8 |
2018-11-01 | We consider the L ^2-critical nonlinear Schrödinger equation with an inhomogeneous damping coefficient a ( x ). We prove the global existence of the solution in H ^1( R ^ d ) and we give the minimal time of the blow up for some initial data. | On the Nonlinear Schrödinger Equation with a Variable Damping Term | 10.1134/S1995080218090378 |
2018-11-01 | A bandwidth method based on power ratio is proposed to evaluate the system damping by using frequency response functions. For single-degree freedom systems, exact formula for calculating damping ratio from displacement frequency response function is established. Additionally, an approximate formula to estimate the damp... | A damping estimation method based on power ratio | 10.1007/s00419-018-1434-2 |
2018-11-01 | In structural control, appropriate control parameters and a stable closed-loop mechanism are required for a controller to achieve optimal performance, particularly in the presence of uncertain structural parameters under external excitation. In this study, an optimum model reference adaptive control (OMRAC) algorithm c... | An optimum model reference adaptive control algorithm for smart base-isolated structures | 10.1007/s10518-018-0403-z |
2018-10-29 | The problem of chatter vibration is associated with adverse consequences that often lead to tool impairment and poor surface finished in a workpiece, and thus, controlling or suppressing chatter vibrations is of great significance to improve machining quality. In this paper, a workpiece and an actuator dynamics are con... | Active Damping of Milling Vibration Using Operational Amplifier Circuit | 10.1186/s10033-018-0291-9 |
2018-10-01 | This paper presents an ant lion optimizer (ALO) that is used to solve the robust and coordinated tuning of power system stabilizers (PSS) and the power oscillation damping (POD) controller of flexible AC transmission system (FACTS) devices in the presence of remote signals in multimachine power systems. The remote sign... | Robust and Coordinated Tuning of PSS and FACTS-PODs of Interconnected Systems Considering Signal Transmission Delay Using Ant Lion Optimizer | 10.1007/s40313-018-0408-5 |
2018-10-01 | High-rise buildings are usually considered as flexible structures with low inherent damping. Therefore, these kinds of buildings are susceptible to wind-induced vibration. Tuned Mass Damper (TMD) can be used as an effective device to mitigate excessive vibrations. In this study, Artificial Neural Networks is used to fi... | Application of artificial neural networks in optimal tuning of tuned mass dampers implemented in high-rise buildings subjected to wind load | 10.1007/s11803-018-0483-4 |
2018-10-01 | We study both analytically and numerically the localized modes in long Josephson junctions with phase shift formations, so-called $$0{-}\pi {-}0$$ 0 - π - 0 and $$0{-}\kappa $$ 0 - κ junctions. The system is described by an inhomogeneous sine-Gordon equation with a variety of time-periodic drives. Perturbation techniqu... | Localized modes in a variety of driven long Josephson junctions with phase shifts | 10.1007/s11071-018-4355-2 |
2018-10-01 | In this article, we consider the oscillation of a class of third-order nonlinear damped delay dynamic equation on time scales of the form $$\begin{aligned} \left( r_2(r_1(y^\Delta )^\alpha )^\Delta \right) ^\Delta (t)+p(t)(y^\Delta )^\alpha (\sigma (t))+q(t)f(y(g(t)))=0. \end{aligned}$$ r 2 ( r 1 ( y Δ ) α ) Δ Δ ( t ) ... | Oscillation of third-order nonlinear delay dynamic equation with damping term on time scales | 10.1007/s12190-017-1158-4 |
2018-10-01 | Mechanical damping of composites reinforced by randomly distributed particles due to interfacial sliding is analyzed. The matrix is elastically isotropic, and the particles are assumed rigid and of identical radii. An auxiliary problem is solved at first for the steady-state response of an infinite matrix containing a ... | Damping of Particle-Reinforced Composites Due to Interfacial Sliding | 10.1007/s10338-018-0051-5 |
2018-10-01 | Structural vibration and noise control of a cavity-backed three-layered smart piezo-coupled rectangular panel system under harmonic or transient loads is achieved by using purely active, passive, and hybrid active/passive piezoelectric shunt networks. Problem formulation is based on the classical lamination plate theor... | Assessment of shunted piezoelectric devices for simultaneous noise and vibration reduction: comparison of passive, active and hybrid networks | 10.1007/s11012-018-0885-4 |
2018-10-01 | A new approach to solving the problem of expanding the functionality of the rotor vibratory gyroscope is presented. Its motion equations are analyzed under modulated damping. Numerical solutions and analytical dependences are obtained, on the basis of which recommendations on technical improvement of the device are pro... | Modulation of Damping in the Rotor Vibratory Gyroscopes | 10.3103/S1068799818040141 |
2018-10-01 | This paper describes the method of numerical solution of decaying vibration equations for heterogeneous composite structures. The system of algebraic equations is generated by applying the Ritz method with Legendre polynomials as coordinate functions. First, real solutions are found. To find complex natural frequencies... | Energy Dissipation during Vibrations of Heterogeneous Composite Structures: 2. Method of Solution | 10.3103/S106345411804012X |
2018-10-01 | Abstract Wave properties of damped solitons in a collisional unmagnetized four-components dusty fluid plasma system contains superthermal distributed electrons, mobile ions, and negative-positive dusty grains have been examined. To study dissipative DIA mode properties, a reductive perturbation (RP) analysis is used un... | Cylindrical Damped Solitary Propagation in Superthermal Plasmas | 10.1134/S1063776118100138 |
2018-10-01 | As an effort to minimize material utilization, seismic steel dampers designed to deform inelastically in an in-plane flexural mode have attracted serious attention recently. This paper presents a new type of metallic yielding damper referred to as the in-plane arch-shaped damper modified from its portal frame-shaped co... | An experimental study of in-plane arch-shaped dampers | 10.1007/s11803-018-0480-7 |
2018-10-01 | Friction-based dampers can be considered as one of the suitable passive control systems for seismic strengthening and rehabilitation of existing substandard structures due to their high adjustability and good energy dissipation capability. One of the main issues in the design of these systems is to obtain the magnitude... | Performance-based optimisation of RC frames with friction wall dampers using a low-cost optimisation method | 10.1007/s10518-018-0380-2 |
2018-10-01 | Viscoelastic (VE) dampers, with their stiffness and energy dissipation capabilities, have been widely used in civil engineering for mitigating wind-induced vibration and seismic responses of structures, thus enhancing the comfort of residents and serviceability of equipment inside. In past relevant research, most analy... | Experimental and analytical study on design performance of full-scale viscoelastic dampers | 10.1007/s11803-018-0469-2 |
2018-10-01 | Concrete is a type of quasi-brittle material with high compressive strength and low tensile strength. To obtain the complete tensile stress-deformation curve of massive concrete specimens, a specially designed loading machine is proposed with a pair of hydraulic oil dampers parallel to the direction of the tensile load... | Experimental Study on the Complete Tensile Stress-Deformation Curve of Fully Graded Concrete | 10.1007/s40799-018-0250-5 |
2018-10-01 | A method for analyzing the influence of temperature on the dynamic characteristics of structures with viscoelastic dampers is proposed in this paper. Dampers which are described by so-called fractional rheological models are considered. The temperature–frequency superposition principle is used to describe the influence... | Approximate method for temperature-dependent characteristics of structures with viscoelastic dampers | 10.1007/s00419-018-1394-6 |
2018-09-28 | Purpose of Review Allergen is an umbrella term for irritants of diverse origin. Along with other offenders such as pathogens, mutagens, xenobiotics, and pollutants, allergens can be grouped as inflammatory agents. Danger-associated molecular patterns (DAMPs) are altered metabolism products of necrotic or stressed cells... | Danger-Associated Molecular Patterns (DAMPs): the Derivatives and Triggers of Inflammation | 10.1007/s11882-018-0817-3 |
2018-09-27 | This article is concerned with the decay and blow-up properties of a nonlinear viscoelastic wave equation with strong damping. We first show a local existence theorem. Then, we prove the global existence of solutions and establish a general decay rate estimate. Finally, we show the finite time blow-up result for some s... | General decay and blow-up of solutions for a nonlinear viscoelastic wave equation with strong damping | 10.1186/s13661-018-1072-1 |
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