Showing papers on "Dynamic Vibration Absorber published in 2019"
TL;DR: In this paper, a nonlinear magnetic vibration absorber is presented and used to control vibration of a three-storey structure, and the response of the primary structure and the vibration mitigation are investigated in the cases of impulsive shock, free vibration with imposed initial displacement, and single frequency excitation.
73 citations
TL;DR: In this paper, a pendulum tuned mass damper is used to suppress damaging vibrations in multi-story buildings across a wide frequency spectrum, which maintain their usefulness across a range of frequencies, unlike passive alternatives.
55 citations
TL;DR: In this paper, a generalized two degree of freedom nonlinear system is used to manifest the functions of both the vibration absorber and energy harvester simultaneously, and the frequency response plots with optimal parameter values are generated.
50 citations
TL;DR: In this article, four kinds of novel inerter-based dynamic vibration absorber with negative stiffness (IN-DVAs) are proposed and analyzed in detail, and the closed-form optimal parameters of the four kinds are obtained based on the classical fixed-points theory.
44 citations
TL;DR: In this paper, a dynamic vibration absorber (DVA) with grounded stiffness element and amplifying mechanism is presented, and the optimal parameters are studied in detail, and it is found that there are three fixed points independent of damping ratio in the amplitude-frequency curves of the primary system.
43 citations
TL;DR: In this paper, the authors present an approach for systematic identification of beneficial passive vibration absorber layouts consist of stay cables, which are prone to vibrations due to their low inherent damping.
Abstract: Stay cables are prone to vibrations due to their low inherent damping. This paper presents an approach for systematic identification of beneficial passive vibration absorber layouts consist...
36 citations
TL;DR: The proposed controller could guarantee the system's asymptotic stability and H∞ performance, simultaneously satisfying the performance constraints such as road holding, suspension stroke, and actuator limitation.
Abstract: In this paper, an output feedback H∞ controller is proposed for active suspension of an electric vehicle driven by in-wheel motors with actuator faults and time delay. The dynamic damping in-wheel motor driven system, in which the in-wheel motor is designed as a dynamic vibration absorber (DVA), is developed to improve ride quality and isolate the force transmitted to motor bearings. Furthermore, parameters of vehicle suspension and DVA are optimized based on the particle swarm optimization (PSO) to achieve better suspension performance. As some of the states such as the DVA velocity and unsprung mass velocity are difficult to measure, a robust H∞ output feedback controller is developed to deal with the problem of active suspension control with actuator faults and time delay. The proposed controller could guarantee the system's asymptotic stability and H∞ performance, simultaneously satisfying the performance constraints such as road holding, suspension stroke, and actuator limitation. Finally, the effectiveness of the proposed output feedback controllers is demonstrated based on the quarter vehicle suspension model under bump and random road excitations.
36 citations
TL;DR: In this article, the optimal design for various types of DVAs under the effect of random ground motion and force excitation has been investigated, and the results showed that the DVAs connected in series are more effective and robust for mitigating vibration than the classic DVA.
29 citations
TL;DR: In this paper, an analytical approach to obtain optimal parameters of a TMD when the vibration absorber is viscoelastically damped is presented, which is a special case of the general results reduced in this paper.
29 citations
TL;DR: In this paper, the shape memory alloy (SMA) is used to control the wave-induced vibrations of the offshore jacket platforms and the SMA-PTMD dynamic vibration absorber (DVA) is a combination of SMA and PTMD.
27 citations
TL;DR: In this paper, the nonlinear saturation principle and 1:2 internal resonance are used in the design of the piezoelectric autoparametric vibration absorber for vibration suppression and energy harvesting.
TL;DR: In this article, a nonlinear convergence algorithm for active dynamic vibration absorber (ADVA) is presented to control the transient vibration caused by the impulse excitation, which is made up of equivalent dynamic modeling equations and frequency estimator.
TL;DR: In this article, two configurations of dynamic vibration absorber in conjunction with negative stiffness (NSDVA) are investigated and their parameter optimization is conducted according to two tuning methodologies: the fixed points theory and the stability maximization criterion.
TL;DR: A new modeling approach and a novel design chart procedures for the trapezoidal bifilar centrifugal pendulum vibration absorber are proposed and the numerical results confirm the reliability of the procedure in terms of rotor torsional vibrations suppression.
TL;DR: In this article, an innovative magnetorheological elastomer torsional vibration absorber is proposed and installed in the torsion vibration system to reduce local and global system vibrations under both resonant and forced vibration conditions.
TL;DR: In this article, the effect of time delays and control gains on the stability, amplitude, frequency-response behavior, peak amplitude, critical excitation amplitude, and compared the optimal values of the controllers gains, simulated and compared.
Abstract: The paper presents time-delayed feedback control to reduce the nonlinear resonant vibration of a piezoelectric elastic beam.a#13; Specially, we examine three single-input linear time-delayed feedback control methodologies: displacement, velocity anda#13; acceleration time-delayed feedback. Moreover, the multi-input time-delayed feedback control methodologies are discussed. Utilizinga#13; the method of multiple scales, the modulation equation and the first order approximations of the primary resonances are derived and the effect of time delay on the resonances is analyzed. Then the effect of time delays and control gains on the stability, amplitude,a#13; frequency-response behavior, peak amplitude, critical excitation amplitude are investigated. Optimal values of the controllers gainsa#13; and delay are obtained, simulated, and compared. The time-delayed feedback control acts as a vibration absorber at specific values of time delay. On the other hand, using using mixed delay feedback controllers demonstrates an excellent improvement in mitigating the first-mode vibration.
TL;DR: In this article, a 2DOF low frequency dynamic vibration absorber (DVA) based on acceleration is proposed to control the low frequency vibration of car body bouncing and pitching, and the acceleration power spectrum density and ride quality of the car body are calculated based on the pseudo excitation method (PEM) and covariance algorithm, respectively.
Abstract: In order to control the low frequency vibration of railway vehicles, a vertical two degrees of freedom (2DOF) low frequency dynamic vibration absorber (DVA) based on acceleration is proposed. Parameters of the dynamic vibration absorber are put forth to control the low frequency vibration of car body bouncing and pitching. Next, the acceleration power spectrum density (PSD) and ride quality of the car body are calculated based on the pseudo excitation method (PEM) and covariance algorithm, respectively. According to the requirement of 2DOF low frequency DVA, the isolators with high static low dynamic stiffness (HSLDS) are designed. A high-speed train dynamic model containing HSLDS isolators is established to validate the effects on the car body vibration. The results reveal that the 2D low frequency DVA can significantly reduce the vibration of the car body bouncing and pitching. Thus, the ride quality of the vehicle is increased, and passenger comfort is improved.
TL;DR: In this article, a rotative non-linear vibration absorber (NVA) is used as a passive suppressor for the vortex-induced vibrations phenomenon (VIV) in a structural model.
Abstract: This paper presents a numerical investigation on the use of a rotative non-linear vibration absorber (NVA) as a passive suppressor for the vortex-induced vibrations phenomenon (VIV) The structural model consists of rigid cylinders mounted on elastic supports and the hydrodynamic loads are calculated using phenomenological models The NVA is defined as a rigid bar, fitted with a tip-mass and hinged to the cylinder Energy is dissipated by means of a linear dashpot linked to the bar Two major groups are studied, the first one being that in which the cylinder is constrained to oscillate in the cross-wise direction (1-dof VIV) The second group, herein named 2-dof VIV, refers to the condition in which simultaneous oscillations in the cross-wise and in-line directions are allowed Characteristic oscillation amplitude curves are obtained as functions of reduced velocities covering the lock-in for different values of the control parameters that define the NVA (namely, its mass, radius and dashpot constant) In addition, quantitative and qualitative aspects of cylinder and suppressor responses are explored in the form of colormaps defined in the space of control parameters for three specific reduced velocities The systematic study shows that the mass parameter of the NVA has more influence on the VIV suppression for both 1-dof VIV and 2-dof VIV In general, the suppression has proved to be greater in the 1-dof VIV case
TL;DR: In this article, a dynamic vibration absorber (DVA) with negative stiffness is employed to control force transmission to a rigid foundation, and the necessary and sufficient conditions for stability are established by Routh-Hurwitz criterion and the stability boundary is obtained.
TL;DR: In this paper, the damping performance of a novel dynamic vibration absorber that exploits the first kind of levitation characteristics of ferrofluid is investigated, and the dependence of the mass of the ferro fluid on the initial eccentricity is investigated in detail.
TL;DR: In this article, the effect of considering soil-structure interaction (SSI) in seismic responses of reinforced concrete (RC) chimneys installed by distributed tuned vibration absorbers vertically (d-MTVAs).
Abstract: This paper investigates the effect of considering soil-structure interaction (SSI) in seismic responses of reinforced concrete (RC) chimneys installed by distributed tuned vibration absorbers vertically (d-MTVAs). A multimode control approach is used to design the d-MTVAs. Two-dimensional (2D) RC chimney is the assembly of beam elements. Frequency-independent constants for the springs and dashpots are used for modeling the raft and the surrounding soil. The equations of motion for nonclassically damped systems are derived and solved using Newmark’s method. The effectiveness of the d-MTVAs is weighed against the case of single tuned vibration absorber (STVA), d-MTVAs suppressing the first modal responses (d-MTVAs-1), and randomly distributed MTVAs (ad-MTVAs). Additionally, parametric studies are conducted for varying mass and damping ratios in the STVA, d-MTVAs-1, ad-MTVAs, and d-MTVAs. In order to show the efficiency in the STVA, d-MTVAs-1, ad-MTVAs, and d-MTVAs cases, responses (displacement and acceleration) at top of the RC chimney while subjected to different real earthquake excitations are computed. It is concluded that the STVA, d-MTVAs-1, ad-MTVAs, and d-MTVAs are effective in response mitigation of the RC chimney; however, d-MTVAs are more efficient while considering equal total mass of the TVA(s). Moreover, the soil type significantly influenced the design parameters of the STVA/d-MTVAs-1/ad-MTVAs/d-MTVAs and seismic response of the RC chimney.
TL;DR: In this paper, two optimization approaches, an average acceleration-based optimization (AABO) and a frequency response function based optimization (FRFBO), are used to improve the seismic mitigation performance of a locally resonant periodic foundation (LRPF) on the impulsive component of a storage tank.
TL;DR: In this article, a vibration absorber with time-delayed feedback control is proposed to suppress vibration of the primary system under excitation with changing frequency, and the effective vibration absorption frequency band is adjustable by tuning the control gain and time delay.
Abstract: Traditional passive vibration absorbers are effective only when their natural frequencies are close to those of the excitations. To solve this problem, a vibration absorber with time-delayed feedback control is proposed to suppress vibration of the primary system under excitation with changing frequency. Firstly, the mechanical model of the delay coupled system is established. Then, the displacement transfer ratio of the system is obtained. The stability of the system is analyzed since delay may result in destabilization. Next, in order to design the control parameters, the vibration absorption performances of the proposed time-delayed vibration absorber are studied. The vibration absorption region is shown. The results show that time-delayed feedback control is able to change the response of the system. The effective vibration absorption frequency band is adjustable by tuning the control gain and time delay. The effective frequency band can be widened when choosing appropriate control parameters. The vibration absorption performances can be greatly improved by the time-delayed absorber. In addition, the optimum control parameters are obtained. Finally, the experimental prototype is constructed. Several tests with different control parameters are taken. The experimental and analytical results match quite well.
TL;DR: In this paper, an active dynamic vibration absorber (ADVA) is used as an accelerometer in a low-frequency range and an air spring is employed as a lowfrequency control device and an inexpensive MEMS-type accelerometer is used to measure the acceleration of the vibration in a high frequency range.
TL;DR: In this paper, the authors present a study on the tuning of vibration absorbers and Helmholtz resonators used to control at target resonance frequencies respectively the flexural response of lightly damped distributed structures and the acoustic response of cavities subject to broadband stochastic excitations.
TL;DR: An explicit two-step calibration procedure for tuned inerter based vibration absorbers on flexible structures makes use of a local approximate representation of the structural response to the device force, in which the contribution of the non-resonant modes is represented approximately around the resonance frequency by a background flexibility and a background inertia term.
Abstract: The paper presents an explicit two-step calibration procedure for tuned inerter based vibration absorbers on flexible structures. It makes use of a local approximate representation of the structural response to the device force, in which the contribution of the non-resonant modes is represented approximately around the resonance frequency by a background flexibility and a background inertia term. The calibration procedure then consists of two steps. The first step calibrates an equivalent vibration absorber including the background terms, and the second step subsequently evaluates the parameters of the actual device by extracting the background flexibility and inertia parameters. The first step represents the classic idealized single degree of freedom representation of the structure, whereas the second step leads to an increase of stiffness, inertia and damping parameters of the actual device due to background flexibility of the structure. The procedure is illustrated in detail for three inerter based vibration absorbers: parallel coupling of damper and stiffness, parallel coupling of damper and inerter, and finally a device with two dampers in parallel with stiffness and inerter elements, respectively. Explicit expressions for the calibration are obtained for each device, and it is demonstrated that the procedure leads to a balanced plateau of amplification around the resonance frequency of the magnitude assumed as the basis for the device parameter calibration.
TL;DR: In this paper, a nonlinear electromechanical vibration suppressor and energy harvester is investigated by changing support of cantilever beam, which is used as the dynamic vibration absorber, the double stiffness system is introduced.
TL;DR: In this paper, the authors investigated the efficiency of dynamic vibration abatement solution for railway-induced vibrations in the framework of a double-deck circular railway tunnel infrastructure and showed that the DVAs would be an effective countermeasure to address railway induced ground-borne vibration.
TL;DR: In this article, the maximum amplitude magnification factor for a linear system equipped with a three-element dynamic vibration absorber (DVA) is exactly minimized for a given mass ratio using a numerical approach.
Abstract: In this study, the maximum amplitude magnification factor for a linear system equipped with a three-element dynamic vibration absorber (DVA) is exactly minimized for a given mass ratio using a numerical approach. The frequency response curve is assumed to have two resonance peaks, and the parameters for the two springs and one viscous damper in the DVA are optimized by minimizing the resonance amplitudes. The three-element model is known to represent the dynamic characteristics of air-damped DVAs. A generalized optimality criteria approach is developed and adopted for the derivation of the simultaneous equations for this design problem. The solution of the simultaneous equations precisely equalizes the heights of the two peaks in the resonance curve and achieves a minimum amplitude magnification factor. The simultaneous equations are solvable using the standard built-in functions of numerical computing software. The performance improvement of the three-element DVA compared to the standard Voigt type is evaluated based on the equivalent mass ratios. This performance evaluation is highly accurate and reliable because of the precise formulation of the optimization problem. Thus, the advantages of the three-element type DVA have been made clearer.
TL;DR: Analysis of the coupled vibrations between a flexible car body (CB) and the equipment suspended beneath it by taking the complex suspension characteristics of the equipment into consideration shows that 1) siting equipment heavier than 2 t near the CB center can reduce the structural vibrations of the CB considerably, and 2) sitting medium-weight equipment near one end of theCB is good for absorbing the vibrations resulting from bogie hunting.
Abstract: A generalized railway vehicle model is built to study the coupled vibrations between a flexible car body (CB) and the equipment suspended beneath it by taking the complex suspension characteristics of the equipment into consideration. Associated theories for the determination of the suspension parameters for CB suspended equipment are summarized systematically, including the vibration isolation methods and the dynamic vibration absorber (DVA) theories for both undamped and damped cases. The equipment is then grouped into four categories by weight, location, and the excitation that it is subjected to. A general principle for the determination of the suspension parameters is proposed for better vibration isolation effects concerning bogie hunting, the elastic modes of the CB and its excitations. Analysis based on DVA theory shows that 1) siting equipment heavier than 2 t near the CB center can reduce the structural vibrations of the CB considerably, 2) siting medium-weight equipment near one end of the CB is good for absorbing the vibrations resulting from bogie hunting, and 3) a rigid connection is suggested for light equipment. Furthermore, on-track field tests of a high speed train confirmed that the heavy equipment vibrated violently upon absorbing some of the CB vibration energy resulting from bogie hunting. However, solid proof of the vertical bending of the CB was not obtained yet because it was sufficiently damped and is not the first natural mode of a modern aluminum-alloy CB. Further research on the lateral flexibility of the CB and its coupled vibrations with the heavy equipment mounted near its center are in need.