Showing papers on "Dynamic Vibration Absorber published in 2021"
TL;DR: A review of the general approaches following the passive and active control technologies are presented, which are including optimal layout technique of pipeline and clamps, constrained layer damping technique, vibration absorber technique, hydraulic hose technique, optimal pump structure technique, and active vibration control technique of Pipeline system.
70 citations
TL;DR: The tuned mass damper is one of the most popular structural vibration suppression techniques as mentioned in this paper. But its performance has not yet reached the state-of-the-art of the art.
Abstract: To date, considerable attention has been paid to the development of structural vibration suppression techniques. Among all vibration suppression devices and techniques, the tuned mass damper is one...
53 citations
TL;DR: In this paper, a quasi-zero-stiffness (QZS) DVA is proposed for ultra-low frequency vibration absorption, and the experimental results show that good performances can be achieved by the QZS DVA under harmonic excitation, and that it notably outperforms the linear DVA for mitigating vibration under random and impulse excitations.
49 citations
TL;DR: In this article, an inertial nonlinear energy sinks (NES) is mounted on the boundaries of the elastic beam to suppress its vibration, and an approximate analytical approach for the steady-state response is developed in this work and verified by numerical solutions.
Abstract: Nonlinear vibration absorbers have been widely used for vibration suppression of elastic structures, but they were usually placed within the structures. However, designing such a vibration damping device within an engineering structure is possibly difficult. In this paper, an inertial nonlinear energy sinks (NES) is mounted on the boundaries of the elastic beam to suppress its vibration. Although this vibration suppression approach is more in line with engineering requirements, it introduces nonlinear oscillators at boundaries. This brings certain difficulties to the structural vibration analysis and the optimal absorber design. An approximate analytical approach for the steady-state response is developed in this work and verified by numerical solutions. The comparison with the uncontrolled system demonstrates the high-efficiency vibration suppression of the inertial NES installed on the boundary. Besides, the optimization of the NES parameters is performed. Resonance amplitude of the elastic structure can be reduced by 98% with the optimized NES. In summary, this paper proposes a novel approach to suppress the bending vibration of elastic structures through boundary NESs. The vibration reduction effect is very significant, and it is more feasible to implement. Therefore, this work is helpful to study the vibration of elastic structures with nonlinear boundaries and to promote the application of nonlinear vibration absorbers. A boundary damping strategy is proposed to solve the problem of the difficulty of installing the vibration absorber in engineering. Introduce an inertial nonlinear energy sinks (NES) to reduce the weight of the shock absorber. The nonlinear boundary is separated and merged into the elastic beam vibration control equation to realize the decoupling of the continuum model. Resonance peak of the elastic structure can be reduced by 98% with the optimized NES. This work is helpful to study the vibration of elastic structures with nonlinear boundaries and to promote the application of nonlinear vibration absorbers.
47 citations
TL;DR: It is concluded that representing the inerter device by a simplified linear dissipative model as opposed to a nonlinear model with friction and gear backlash suffices to trace the BIS response with acceptable accuracy and, thus, can be used for optimal seismic TMDI design.
Abstract: In recent years, inerter vibration absorbers (IVAs), such as the tuned mass damper inerter (TMDI), attracted much attention in the literature for reducing seismic displacement demands of base isolated structures (BISs). Several theoretical studies reported reduced BIS seismic demands with increasing inertance endowed by a grounded inerter element but adopted mostly idealized linear dynamical models. Herein, the potential of TMDI-configured IVAs for seismic response reduction of BISs modelled as single-mass structures is assessed under the combined effects of nonlinear inerter and structural behaviour. To this aim, experimental data from a shaking table testing campaign are considered utilizing a custom-built flywheel rack-and-pinion grounded inerter prototype with variable inertance along with high damping rubber bearings in the isolation layer and in the BIS-to-absorber link. White noise excitation and an ensemble of six ground motions (GMs) with different frequency content are used in the tests for which bearings exhibit softening nonlinear behaviour. Experimental results demonstrate improvement of BIS nonlinear seismic response in terms of displacement and base shear with increasing inertance for nonlinear and non-optimally designed TMDIs. It is found though that non-optimally tuned IVAs may be detrimental to BIS acceleration response depending on the GMs time-varying frequency content signatures as captured by the continuous wavelet transform spectrogram. Lastly, it is concluded that representing the inerter device by a simplified linear dissipative model as opposed to a nonlinear model with friction and gear backlash suffices to trace the BIS response with acceptable accuracy and, thus, can be used for optimal seismic TMDI design.
40 citations
TL;DR: In this article, a two-dimensional circular acoustic black hole-based dynamic vibration absorber (2D ABH-DVA) is proposed as an auxiliary component to an existing structure for vibration suppressions.
38 citations
TL;DR: In this article, a quasi-zero stiffness (QZS) spring is used to adjust the stiffness and symmetry of a rigid mass suspended on a multi-modal beam.
35 citations
TL;DR: It is found that reduced free-end displacement and TMDI stroke are achieved for primary structures in which the ratio of flexural rigidity over mass decreases faster with height resulting in vibration modal shapes with higher convexity.
Abstract: The tuned mass-damper-inerter (TMDI) is a linear passive dynamic vibration absorber widely considered in the literature to mitigate the motion of dynamically excited primary structures. Previous studies focused on optimal TMDI tuning approaches and connectivity arrangements to improve motion control efficiency for some given primary structure. This paper investigates the influence of the elastic and mass properties of the primary structure to the TMDI motion control performance. This is pursued through an innovative parametric study involving a wide range of tapered beam-like cantilevered primary structures with different continuously varying flexural rigidity and mass distributions equipped with TMDIs optimally tuned for resonant harmonic and for white noise excitations. Optimal TMDI tuning and performance assessment are expedited through a novel simplified two-degree-of-freedom dynamic model which accounts for the properties of the primary structure. It is found that reduced free-end displacement and TMDI stroke are achieved for primary structures in which the ratio of flexural rigidity over mass decreases faster with height resulting in vibration modal shapes with higher convexity. The latter is quantified though the average modal curvature shown to be well-correlated with TMDI motion control improvement. It is concluded that judicial shaping of the primary structure extends the applicability of the TMDI to structures where connecting the inerter away from the free-end is practically challenging while contains the magnitude of the inerter and damping forces exerted to the primary structure. Therefore, this study paves the way towards combining optimal TMDI tuning with primary structure design for improved performance to dynamic loads.
33 citations
TL;DR: In this paper, a metamaterial whose unit cell consists of a dynamic vibration absorber with negative stiffness (NSDVA) was proposed, which exhibits a quasi-static bandgap and negative effective stiffness due to the presence of a negative stiffness element.
32 citations
TL;DR: In this article, the rotational inertia double tuned mass damper (RIDTMD) was used for damping in-plane vibrations of a floating offshore wind turbine (FOWT).
25 citations
TL;DR: This paper investigates the kinematics and the nonlinear dynamics of trapezoidal dampers by means of intrinsic geometry theoretical tools and perturbation methods, respectively and offers insights about the influence of absorber center of mass path on the overall performance.
Abstract: The number of applications of centrifugal pendulum vibration absorber (CPVA) in the automotive industry is growing steadily. The request of low fuel consumption and torque increase at low speed stimulated a large variety of drive concepts, such as downsizing, cylinder deactivation and hybrid powertrains. These design solutions increased the severity of torsional vibrations as well as the need of more effective devices to damp them out. For this reason, in recent years new types of CPVAs have appeared on the market. In particular, a pendulum with trapezoidal architecture, called torsichrone, has been developed. Its distinctive feature consists in the exploit of absorbers rotational kinetic energy for additional vibration attenuation. This paper investigates the kinematics and the nonlinear dynamics of trapezoidal dampers by means of intrinsic geometry theoretical tools and perturbation methods, respectively. It also offers insights about the influence of absorber center of mass path on the overall performance. Furthermore, optimization criteria for the rotational component of absorbers motion are proposed. On the basis of such analyses, design guidelines are recommended. Finally, to assess vibration isolation effectiveness and local stability behavior of trapezoidal CPVAs, a numerical comparison with the tautochrone parallel pendulum and results of multibody dynamics simulation are discussed.
TL;DR: In this article, the reduction of structural vibrations by means of an electromagnetic shunt damper (EMSD) combined with a mechanical dynamic vibration absorber (DVA) has been studied.
Abstract: In this study, we address the reduction of structural vibrations by means of an electromagnetic shunt damper (EMSD) combined with a mechanical dynamic vibration absorber (DVA). Two architectures, t...
TL;DR: In this paper, the authors presented the principle design of tri-stable systems and mathematical modeling of a 2-dof tri-stable DVA and energy harvester, and the energy harvesting performance of multi-stable energy harvesting was evaluated under impulsive excitations and harmonic vibrations.
27 Jan 2021
TL;DR: Results show that the active suspension with a developed H∞ controller can effectively achieve better ride comfort and road-holding ability compared with passive suspension despite the existence of control constraints and parameter variations.
Abstract: This paper presents a constrained robust H∞ controller design of active suspension system for in-wheel-independent-drive electric vehicles considering control constraint and parameter variation. In the active suspension system model, parameter uncertainties of sprung mass are analyzed via linear fraction transformation, and the perturbation bounds can be also limited, then the uncertain quarter-vehicle active suspension model where the in-wheel motor is suspended as a dynamic vibration absorber is built. The constrained robust H∞ feedback controller of the closed-loop active suspension system is designed using the concept of reachable sets and ellipsoids, in which the dynamic tire displacements and the suspension working spaces are constrained, and a comprehensive solution is finally derived from H∞ performance and robust stability. Simulations on frequency responses and road excitations are implemented to verify and evaluate the performance of the designed controller; results show that the active suspension with a developed H∞ controller can effectively achieve better ride comfort and road-holding ability compared with passive suspension despite the existence of control constraints and parameter variations.
TL;DR: In this paper, a low-frequency and high-amplitude swaying of the car body, which continues for a period of time, posing a danger to railway vehicles is described.
Abstract: Low-frequency swaying is an abnormal vibration of railway vehicles. It is manifested by a low-frequency and high-amplitude swaying of the car body, which continues for a period of time, posing a si...
TL;DR: In this paper, an elastic meta-absorber (EMA) based on the quasi-bound states of the continuum (BICs) physical approach is proposed, which is capable of achieving perfect absorption of the flexural waves propagating in an elastic beam.
TL;DR: In this article, Wang et al. combined the nonlinearities from the midplane stretching of the conductor, equivalent cubic stiffness of the Damper, and fluctuating lift force modeled as a Van der Pol oscillator in a single model to investigate the vortex-induced vibrations.
Abstract: Vortex-induced vibrations are one of the major factors in fatigue failure of power transmission lines and can be mitigated using vibration absorbers in the form of Stockbridge dampers. Since power transmission lines play an important role in modern infrastructure, a thorough understanding of the nonlinear dynamical interactions between conductors, dampers, and wind forces is crucial. Although different nonlinear models exist for conductor vibration with attached dampers or under wind force, no work combines all these nonlinearities in a single model and examines the dynamics of the conductor along with dampers. In an attempt to fill this gap, this work combines the nonlinearities from the mid-plane stretching of the conductor, equivalent cubic stiffness of the Stockbridge damper, and fluctuating lift force modeled as a Van der Pol oscillator in a single model to investigate the nonlinear vortex-induced vibrations. In this work, the conductor is modeled as a simply supported beam and the Stockbridge damper as a mass–spring–damper–mass system with a combination of cubic and linear stiffness. The governing equations of motion are solved analytically using the method of multiple scales for the case of primary resonance between the fluctuating lift-force and conductor. Analytical findings are further validated by comparing against the numerical integration of a reduced-order system, and the results show an excellent match. The analysis is extended by conducting a parametric study to investigate the effect of different system parameters on the frequency response curves. These findings are promising and further provide a direction to design an optimal vibration absorber.
TL;DR: In this paper, a coupling model of the composite laminated beam embedded with NiTi-ST is proposed, where the nonlinear restoring force and hysteretic damping force are processed into polynomial form.
Abstract: NiTiNOL-steel wire rope (NiTi-ST) is a new vibration absorber with nonlinear stiffness and hysteretic damping. Although there are many studies on NiTi-ST nonlinear identification, there are few studies on vibration suppression for laminated structures with NiTi-ST. In the present work, the NiTi-ST is integrated with a composite laminated beam for structural vibration suppression for the first time. A coupling model of the composite laminated beam embedded with NiTi-ST is proposed. The nonlinear restoring force and hysteretic damping force of NiTi-ST are processed into polynomial form. The responses of the beam embedded with different NiTi-ST are investigated by the Galerkin discretization together with the harmonic balance method (HBM). The terms of the polynomial model are discussed. Two numerical methods are utilized for steady-state responses and numerical validations. Simulation results demonstrate the effectiveness of NiTi-ST. This vibration suppression method can be popularized for other laminated structures and contribute to vibration control in engineering fields.
TL;DR: The results show that, for the low-frequency nonlinear primary system, the antiresonance frequency band can be tuned and the vibration amplitude can be reduced to zero due to the effect of time-delayed control.
Abstract: In this article, the vibration absorption performances of a vibration absorber with time-delayed feedback control for a low frequency primary system are studied. In order to extend the effective working frequency band of the time-delayed vibration absorber, its stiffness is designed as an adjustable parameter. The stiffness value of the beam-structure absorber can be tuned by a group of stoppers that can change the constraint condition of the beam. First, the mechanical model of the proposed delay-coupled system is established. Then, the stability boundaries of the proposed system are derived. Next, the analytical approximate solutions of the system are obtained to reveal the frequency response functions. Moreover, two parameter design principles for low-frequency nonlinear primary system are proposed based on the antiresonance frequency and optimum condition. The results show that, for the low-frequency nonlinear primary system, according to the design principles, the antiresonance frequency band can be tuned and the vibration amplitude can be reduced to zero due to the effect of time-delayed control. Relevant experimental prototype is constructed to verify the efficacy of the proposed vibration absorber with time-delayed control.
TL;DR: In this paper, a double pendulum vibration absorber was designed to attenuate the fundamental and second harmonic order of the torsional vibration of the drive shaft and also in the vibration levels at seating locations.
TL;DR: In this article, a variable stiffness torsional vibration absorber with a magnetorheological elastomer (MRE) as an intelligent controlling element is designed, and the modal analysis, frequency tracking scheme, and damping effects have been studied.
Abstract: . The semi-active torsional vibration absorber can effectively reduce the torsional vibration of the power-train system. In this paper, a new type of variable stiffness torsional vibration absorber with a magnetorheological elastomer (MRE) as an intelligent controlling element is designed, and the modal analysis, frequency-tracking scheme, and damping effects have been studied. A transient dynamic simulation is utilized to validate the rationality of the mechanical structure, the magnetic field parameters of the absorber are matched, and the magnetic circuit simulation analysis and the magnetic field supply analysis are carried out to verify the closed magnetic circuit. The principle prototype of the innovative vibration absorber is manufactured, the magnetic field strength of the absorber is tested by a Gauss meter, and the results show the efficacy of magnetizing the vibration absorber with a conductive slip ring by solving the magnetizing problem of the rotating parts of the vibration absorber. A special-purpose test rig with a torsional vibration exciter as a power source has been implemented. A comparative experiment has been carried out to test the frequency shift characteristics and authenticate the vibration-reduction effect of the new MRE torsional vibration absorber.
TL;DR: In this article, a linear tuned vibration absorber is applied to increase stall flutter wind speed and eliminate limit cycle oscillations, and the effect of the absorber parameters on the stability of equilibria is investigated using the Lienard-Chipart criterion.
Abstract: The dynamics of a two-degrees-of-freedom (pitch–plunge) aeroelastic system is investigated. The aerodynamic force is modeled as a piecewise linear function of the effective angle of attack. Conditions for admissible (existing) and virtual equilibria are determined. The stability and bifurcations of equilibria are analyzed. We find saddle-node, border collision and rapid bifurcations. The analysis shows that the pitch–plunge model with a simple piecewise linear approximation of the aerodynamic force can reproduce the transition from divergence to the complex aeroelastic phenomenon of stall flutter. A linear tuned vibration absorber is applied to increase stall flutter wind speed and eliminate limit cycle oscillations. The effect of the absorber parameters on the stability of equilibria is investigated using the Lienard–Chipart criterion. We find that with the vibration absorber the onset of the rapid bifurcation can be shifted to higher wind speed or the oscillations can be eliminated altogether.
TL;DR: In this paper, an ideal two-dimensional vibration absorber with three spring joints is designed with the three eigenfrequencies identical with the excitation frequency to be absorbed to compensate the damping and adjust the stiffness of the three active connecting elements.
TL;DR: In this paper, a single degree of freedom nonlinear spring-mass primary (main) system subjected to simultaneous external harmonic and parametric excitation by using traditional and non-traditional active nonlinear vibration absorber (ANVA) is carried out.
TL;DR: It is found that the response suppression effectiveness of the IDVA is robust to the main system nonlinearity and to the intensity of the random excitation.
Abstract: Inerter-based dynamic vibration absorber (IDVA) has been widely used to reduce the responses of vibration systems. Its application to the nonlinear system is underexamined and will be explored. In the present investigation, an IDVA is applied to a randomly excited nonlinear system which is of concern. The random response of the nonlinear system is analyzed by introducing a generalized harmonic transformation and establishing the relationships between the responses of the nonlinear main system and the IDVA secondary system. Numerical results are given to illustrate the applicability and effectiveness of the proposed method. The influences of the parameters of the IDVA, the main nonlinear system, and the excitation on the mean-square displacement response of the nonlinear system are investigated. Furthermore, the suppression effectiveness of the IDVA is discussed in detail. Comparison of the approximate analytical results and simulation results shows that the proposed method is accurate and effective in quite large parameter ranges. Moreover, it is found that the response suppression effectiveness of the IDVA is robust to the main system nonlinearity and to the intensity of the random excitation.
TL;DR: In this article, the exact nonlinear dynamics of a simply-supported beam carrying a nonlinear spring-inerter-damper energy absorber for primary resonance vibration reduction were derived from the energy method by considering the midplane stretching, structural discontinuity, and nonlinear boundary conditions at the springinerterdamper location of the beam.
TL;DR: Numerical simulations indicate that the mobile damping robot significantly improves the vibration suppression of the power line.
TL;DR: In this paper, the steady-state dynamic characteristics of non-smooth vibration absorbers are investigated, where the complexification-averaging method is used to obtain the steady state response equation of a harmonic excited primary system attached to the nonsmooth absorbers, with the equation solved using a Matlab program based on the least square method.
Abstract: The steady-state dynamic characteristics of non-smooth vibration absorbers are investigated. The complexification-averaging method is used to obtain the steady-state response equation of a harmonic excited primary system attached to the non-smooth absorbers, with the equation solved using a Matlab program based on the least square method. Research results indicate that the traditional purely nonlinear absorber loses its efficacy after the excitation amplitude reaches a certain value. The non-smooth absorber with piecewise linear damping, by contrast, can suppress vibration of the primary system within a larger range of excitation amplitude than the purely nonlinear absorber. Then, the cubic stiffness component is substituted by a piecewise stiffness component to further enhance the performance of the above non-smooth absorber and good results are obtained. The non-smooth absorber with both piecewise damping and stiffness shows the stronger vibration absorption performance. In addition, the differences of higher branches of response which induced by the three absorbers are analyzed and discussed.
TL;DR: The novel IWP-DVA could improve the ride comfort with a sufficient stroke and was verified based on the static analysis of the single-EGSR mechanism, where the negative phenomena of stroke depletion due to the driving torque exists.
TL;DR: This work is one of the first studies of 2D nonlinear vibration absorbers capable of robust passive mitigation of seismic loads applied in arbitrary planar directions, suitable for broad applications ranging from the nano/micro- to the macro-scale.