Showing papers on "Dynamic Vibration Absorber published in 2020"
TL;DR: A critical review of active, passive, semi-active and hybrid control systems of TMD used for preserving structures against forces induced by earthquake or wind, and provides a comparison of their efficiency, and comparative advantages and disadvantages.
Abstract: Given the burgeoning demand for construction of structures and high-rise buildings, controlling the structural vibrations under earthquake and other external dynamic forces seems more important than ever. Vibration control devices can be classified into passive, active and hybrid control systems. The technologies commonly adopted to control vibration, reduce damage, and generally improve the structural performance, include, but not limited to, damping, vibration isolation, control of excitation forces, vibration absorber. Tuned Mass Dampers (TMDs) have become a popular tool for protecting structures from unpredictable vibrations because of their relatively simple principles, their relatively easy performance optimization as shown in numerous recent successful applications. This paper presents a critical review of active, passive, semi-active and hybrid control systems of TMD used for preserving structures against forces induced by earthquake or wind, and provides a comparison of their efficiency, and comparative advantages and disadvantages. Despite the importance and recent advancement in this field, previous review studies have only focused on either passive or active TMDs. Hence this review covers the theoretical background of all types of TMDs and discusses the structural, analytical, practical differences and the economic aspects of their application in structural control. Moreover, this study identifies and highlights a range of knowledge gaps in the existing studies within this area of research. Among these research gaps, we identified that the current practices in determining the principle natural frequency of TMDs needs improvement. Furthermore, there is an increasing need for more complex methods of analysis for both TMD and structures that consider their nonlinear behavior as this can significantly improve the prediction of structural response and in turn, the optimization of TMDs.
43 citations
TL;DR: The study gives an answer about effectiveness of the both harvester systems, suggests that the proposed concept can be useful in practice and proposes new indicators to find a consistency between vibration suppression and energy recovery.
41 citations
TL;DR: In this article, the authors present the practical realization of a digital vibration absorber that, owing to the flexibility provided by the digital unit, synthesizes linear and nonlinear shunt circuits.
Abstract: This study presents the practical realization of a digital vibration absorber that, owing to the flexibility provided by the digital unit, synthesizes linear and nonlinear shunt circuits. The absorber, composed of a microprocessor and a current source, is connected to the host structure with piezoelectric patches. The performance of both circuits is compared experimentally for a nonlinear host structure. The superiority of a properly-tuned nonlinear absorber over its linear counterpart is validated, but the limits of the nonlinear absorber are also explored. Moreover, the accuracy of the tuning procedure and formulas is assessed through experimental parametric studies.
34 citations
TL;DR: In this paper, a nonlinear vibration absorption of a laminated composite beam is investigated with the account of complex environment (moisture and temperature), and a passive efficient nonlinear energy sink (NES) vibration absorber is used to control the transverse vibration.
Abstract: Nonlinear vibration absorption of a laminated composite beam is investigated with the account of complex environment (moisture and temperature). A passive efficient nonlinear energy sink (NES) vibration absorber is used to control the transverse vibration. The generalized Hamilton principle is applied to derive a dynamic model of the laminated composite beam coupled with the NES. Numerical simulations reveal the effects of temperature, moisture, and laying angle on natural frequencies. It is numerically found that the NES can rapidly reduce the vibration amplitude. Then, approximate analytical solutions are sought via the harmonic balance method. The approximate analytical solutions are confirmed by the numerical solutions. Amplitude–frequency response curves show that the NES can reduce the amplitude to very low values for various temperatures, moisture levels, and laying angles. In a certain ranges of the NES parameters, different control effects are determined via an approximate analysis. It is demonstrated that the NES is a promising approach to control vibration of a laminated composite beam in complex environment.
30 citations
TL;DR: In this article, an active dynamic vibration absorber (ADVA) is introduced by adding an active element to a classical mass-spring-damper system, which drives the mass by a controlling force using feedback signal from the response of the aeroelastic system.
27 citations
TL;DR: In this article, a novel high-performance nontraditional inerter-based dynamic vibration absorber called NIDVA-C4 is presented, and performance evaluation is carried out by computing two performance measures, which are the H ∞ and H 2 performance indices.
23 citations
TL;DR: In this article, the vibration absorbing characteristics of an electromagnetic (EM) vibration absorber in the rotational machine are studied. And theoretical analysis results show that the vibration response of rotational machines and its load rotor can be regulated by tuning the stiffness coefficient and the damping coefficient of torque generated by the EM vibration absorbers.
18 citations
21 Apr 2020
TL;DR: In this paper, the challenges of ride comfort improvement and vibration suppression in in-wheel-motor-driven electric vehicles are addressed. And a mathematical model of a quarter vehicle is presented.
Abstract: This study addresses the challenges of ride comfort improvement and in-wheel-motor vibration suppression in in-wheel-motor-driven electric vehicles. First, a mathematical model of a quarter vehicle...
17 citations
TL;DR: In this paper, a nonlinear multi-modal energy harvester and vibration absorber (EHVA) for both energy harvesting and vibration suppressing in low-medium frequency band is presented.
17 citations
TL;DR: In this paper, a time-delayed vibration absorber is proposed to realize the equal-peak property for a nonlinear primary system, and the results show that the equal peak property can be realized by appropriate delay coupled parameters obtained by the optimization procedure.
16 citations
01 Dec 2020
TL;DR: In this article, the stress and strain state of hybrid (combined) systems including flexible and rigid elements is studied, and theoretical approach is presented, i.e., structural nonlinearity.
Abstract: Stress and strain state of hybrid (combined) systems including flexible and rigid elements is studied in the article. Theoretical approach is presented. The feature of the systems studied is described, i.e. structural nonlinearity. Numerical analysis is presented. It is pointed out that vibrations of such structures upon conditions of resonance differ from those of classical bar structures, i.e. if for rigid bar systems the amplitudes of vibration at resonant disturbance increase monotonously, in combined (hybrid) system alternate switching off tie-bars stabilizes the amplitude of vibration at a certain value and transfers vibrations in the beating mode that can be considered as an internal vibration absorber.
TL;DR: A multidisciplinary design optimization strategy has been formulated to maximize the frequency range of the proposed MRE-based ATVA while respecting constraints of weight, size, mechanical stress, and sandwich beam deflection.
Abstract: The present study aims to investigate the dynamic performance and design optimization of a novel magnetorheological elastomer based adaptive tuned vibration absorber (MRE-ATVA). The proposed MRE-ATVA consists of a light-weight sandwich beam treated with an MRE core layer and two electromagnets installed at both free ends. Three different design configurations for electromagnets are proposed. The finite element (FE) model of the proposed MRE-ATVA and magnetic model of the electromagnets are developed and combined to evaluate the frequency range of the absorber under varying magnetic field intensity. The results of the developed model are validated in multiple stages with available analytical and simulation data. A multidisciplinary design optimization strategy has been formulated to maximize the frequency range of the proposed MRE-based ATVA while respecting constraints of weight, size, mechanical stress, and sandwich beam deflection. The optimal solution is obtained and compared for the three proposed ATVA configurations. The optimal ATVA with a U-shaped electromagnet shows more than 40% increase in the natural frequency while having a total mass of 596 g.
TL;DR: In this paper, the non-smooth nonlinear energy sink (NSNES) was used to suppress the vibration of the rotor-bladed system, and numerical simulations were applied to evaluate the vibration suppression ability of the NSNES on rotor and blade.
01 Aug 2020
TL;DR: Magnetorheological elastomer is a new kind of intelligent material that mainly incorporates micron-sized ferromagnetic particles into a polymer as discussed by the authors and is a dynamic vibration absorber that is based on the co...
Abstract: Magnetorheological elastomer is a new kind of intelligent material that mainly incorporates micron-sized ferromagnetic particles into a polymer. A dynamic vibration absorber that is based on the co...
TL;DR: A method by using an additional dynamic vibration absorber (DVA) to control the vibrations in the milling-based edge trimming process of the plate-like workpieces and a simulation-and-analysis-combined approach for predicting the modal parameters of the workpiece under different layouts of the DVA is proposed.
TL;DR: In this article, the dynamics of a two-degrees-of-freedom system consisting of a nonlinear absorber attached to a primary linear structure under external excitations were investigated, and the effect of the hysteretic damping on the passive mitigation of structural vibrations was investigated.
Abstract: The present paper deals with the dynamics of a two-degrees-of freedom system consisting of a nonlinear absorber attached to a primary linear structure under external excitations. The nonlinear attachment exhibits a hysteretic restoring force modeled with the classic Bouc–Wen law [hysteretic vibration absorber (HVA)]; furthermore, the mechanical characteristics of the nonlinear oscillator are tuned to regulate the ratio between the two natural frequencies and to lead the system near to internal resonance conditions. The steady-state periodic solutions are investigated, and particular attention is given to the study of modal interactions by means of frequency response curves for various excitation levels. A parametric investigation is performed to analytically detect the conditions for the occurrence of (n : 1) internal resonances for low and high external excitations. Finally, specific resonance conditions have been found under which the nonlinear attachment produces a notable reduction of the vibration amplitude of the primary system for a wide range of the excitation level. The aim of the paper is therefore twofold: the first purpose is to investigate the effect of the hysteretic damping on the passive mitigation of structural vibrations. The second purpose is to improve the system capacity of mitigating structural vibrations, by optimally choosing the characteristics of the HVA.
TL;DR: In this article, a coupled dynamic modelling of the guiding hoisting system is established, which includes the transverse-longitudinal-coupled vibration and the rotational vibration.
Abstract: A coupled dynamic modelling of the flexible guiding hoisting system is established, which includes the transverse-longitudinal-coupled vibration and the rotational vibration. Substituting v...
01 Jan 2020
TL;DR: In this paper, a hybrid proportional electromagnetic dynamic vibration absorber consisting of an electromagnetic actuator and an elastic element was proposed for control of engine vibration during idling, which was tested on a single engine.
Abstract: A hybrid proportional electromagnetic dynamic vibration absorber consisting of an electromagnetic actuator and an elastic element is proposed for control of engine vibration during idling. The desi...
TL;DR: In this paper, the performance of a dynamic vibration absorber is evaluated with two degrees of freedom quarter car model of a road vehicle system when excited with deterministic inputs, and the transmissibility of vibrations from the track to the sprung mass, the transfer function of sprung mass acceleration, suspension deflection and tire deflection is determined.
Abstract: In cases where the natural frequencies of vibrations of a vehicle system are closed to the excitation frequencies from the road surface, dynamic vibration absorber provides the vibration isolation by shifting the resonant frequencies of the system. In the present work, the performance of a dynamic vibration absorber is evaluated with two degrees of freedom quarter car model of a road vehicle system when excited with deterministic inputs. The transmissibility of vibrations from the track to the sprung mass, the transfer function of sprung mass acceleration, the transfer function of suspension deflection and the transfer function of tire deflection is determined.
TL;DR: In this article, the performance of the acceleration feedback control is compared with that of the simple passive vibration absorber and the effect of time-delay in the feedback loop is also investigated.
Abstract: Vortex-induced vibration is a common phenomenon observed in many engineering applications and it is detrimental to the performances and health of the system. It is, therefore, imperative for engineers to make suitable design modifications or arrange for some type of control device to mitigate such oscillations. In this paper, the performance of the acceleration feedback control is compared with that of the simple passive vibration absorber. The effect of time-delay in the feedback loop is also investigated. The acceleration of the primary system is measured and passed through a second-order compensator. The active absorber is designed by setting the filter frequency same as the natural frequency of vibration and the optimum filter damping is numerically obtained. Nonlinear analysis is performed using the Describing Function method and the results are validated using direct numerical simulation performed in MATLAB Simulink. In the present paper, vortex shedding frequencies are selected from two different regions, one with vortex shedding frequency less than the natural frequency of the system and other having vortex shedding frequency higher than the natural frequency of the system. It is observed that the acceleration feedback control can effectively reduce the amplitude of vibration to a great extent. It is also observed that the amplitude of the system changes marginally (up to a certain value of time-delay) in the pre-locking and locking region. However, the effect of time-delay in post-locking zone is detrimental. Beyond a certain value of the time-delay, the amplitude becomes large and even the system may become unstable.
TL;DR: Tuned mass damper technologies are progressively advancing through innovative application of smart materials, facilitating more versatile infrastructure protection during seismic events, primarily during earthquakes as discussed by the authors, and they can be used to enhance infrastructure protection.
Abstract: Tuned mass damper technologies are progressively advancing through innovative application of smart materials, facilitating more versatile infrastructure protection. During seismic events, primarily...
TL;DR: The numerical calculations show that the ADVA and DVA are effective in suppressing the vibration and provide approximately 41.2% and 17.6% improvement, respectively, compared with the case of no DVA.
TL;DR: In this article, a solution of the vibration attention problem on a flexible structure from a dynamic vibration absorption perspective is experimentally and numerically studied, where linear and nonlinear dynamic vibration absorbers are properly implemented on a primary structure of n degrees of freedom through a modal decomposition analysis.
Abstract: A solution of the vibration attention problem on a flexible structure from a dynamic vibration absorption perspective is experimentally and numerically studied in this article. Linear and nonlinear dynamic vibration absorbers are properly implemented on a primary structure of n degrees of freedom through a modal decomposition analysis and using the tuning condition when the primary system has one single degree of freedom. A time-domain algebraic identification scheme for on-line modal parameter estimation of flexible structures is presented. A fast frequency estimation of harmonic excitation force is also obtained. A Hilbert transform analysis of the frequency response function for the case of nonlinear dynamic vibration absorption is introduced. In this way, influence of this particular passive nonlinear control device on system dynamic response can be determined. The proposed approach is validated on an harmonically perturbed building-like structure, which is discretized in a finite number of degrees of freedom. The flexible structure is subjected to resonant operational conditions, and coupled to a pendulum vibration absorber configured as a tuned mass damper as well as an autoparametric system.
TL;DR: In this paper, an equivalent mechanical vibration absorber with a spring, dashpot, and inerter in series is represented as a mechanical shunt damping system, and a common calibration procedure for m...
Abstract: Electromagnetic and piezoelectric shunt damping can be represented by an equivalent mechanical vibration absorber with a spring, dashpot, and inerter in series. A common calibration procedure for m...
TL;DR: This study proposes a methodology to increase the efficiency of the dynamic absorber into a frequency band of interest using a robust optimization method solved using a multi-objective optimization algorithm together with uncertainty and sensitivities analyses.
Abstract: This contribution aims at analyzing the effect of uncertain parameters on the frequency-domain behavior of a dynamic vibration absorber for the robust optimization that improves its performance based on uncertainty and sensitivity analyses. Although uncertainty and sensitivity analyses have been widely used, the main contribution of this paper consists in applying these concepts in the optimal design of a dynamic absorber considering uncertain operational conditions. Consequently, this study proposes a methodology to increase the efficiency of the dynamic absorber into a frequency band of interest. For this aim, a robust optimization method, solved using a multi-objective optimization algorithm, together with the uncertainty and sensitivities analyses is applied. The uncertain parameters are modeled as random variables based on experimental measurements obtained from a parameter identification procedure. Uncertainty and sensitivity analyses of the dynamic vibration absorber are assessed based on a probabilistic framework using the Monte Carlo simulation. Robust optimization is implemented and solved using a multi-objective genetic algorithm. The numerical results demonstrate the influence of the uncertain parameters on the dynamic behavior of the considered mechanical system. Moreover, the optimization procedure allowed determining its optimal design, improving its dynamic performance, and robustness.
12 Feb 2020
TL;DR: In this article, the design of a turning cutting tool with a large length-diameter was proposed for structural parts with a deep hole, from the demand of manufacturing structural parts.
Abstract: The vibration absorber has been effective in vibration control. From the demand of manufacturing structural parts with a deep hole, the design of a turning cutting tool with large length–diameter r...
TL;DR: In this paper, the authors address dynamic modeling and disturbability of flywheels in the context of high-sensitivity instruments on board of a ship, and propose a dynamic modeling approach.
Abstract: Flywheels generate speed-related disturbances and induce micro-vibrations that influence the performance of high-sensitivity instruments on board. This study addresses dynamic modeling and disturba...
TL;DR: The vibration suppression of fractionally damped thin rectangular plates is studied and the formulation of the problem is capable of optimizing the norm of the plate deflection at the wide frequency band with respect to mass, stiffness, and fractional damping parameters.
Abstract: The vibration suppression of fractionally damped thin rectangular plates is studied. The plate has simply supported edges and is subjected to a concentrated harmonic loading. The vibration suppress...
TL;DR: In this paper, the steady state response of a particular harvesting system is investigated under the condition of external and internal resonance, with emphasis on the double jump phenomenon, and the method of multiple scales is applied to derive the modulated amplitude versus frequency at the vicinity of flapwise and chordwise primary resonances, as well as around other internal resonance frequencies.