Topic
Dynamic Vibration Absorber
About: Dynamic Vibration Absorber is a research topic. Over the lifetime, 4764 publications have been published within this topic receiving 49429 citations.
Papers published on a yearly basis
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TL;DR: In this article, the solutions to H∞ and H2 optimization problems of a variant dynamic vibration absorber (DVA) applied to suppress vibration in beam structures are derived analytically.
Abstract: The solutions to H∞ and H2 optimization problems of a variant dynamic vibration absorber (DVA) applied to suppress vibration in beam structures are derived analytically. The H∞ optimum parameters such as tuning frequency and damping ratios are expressed based on fixed-point theory to minimize the resonant vibration amplitude, as well as, the H2 optimum parameters to minimize the total vibration energy or the mean square motion of a beam under random force excitation as analytical formulas. The reduction in maximum amplitude responses and mean square motion of a beam using the traditional vibration absorber is compared with the proposed dynamic absorber. Numerical results show the non-traditional DVA under optimum conditions has better vibration suppression performance on beam structures than the traditional design of DVA. Furthermore, comparing H∞ and H2 optimization procedures shows that for a beam under random force excitation, use of H2 optimum parameters resulting in smaller mean square motion than the other optimization.
22 citations
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30 Aug 1982TL;DR: In this article, an installation for damping vibrations in the drive connection of a motor vehicle by a vibration absorber which includes, in coaxial arrangement with the cardan shaft, an annular vibrating mass, a carrier flange adapted to be secured to the carda-nous shaft, and a resilient body of an elastomeric material was presented.
Abstract: An installation for damping vibrations in the drive connection of a motor vehicle by a vibration absorber which includes, in coaxial arrangement with the cardan shaft, an annular vibrating mass, a carrier flange adapted to be secured to the cardan shaft, and a resilient body of an elastomeric material which effects the vibration coupling of the vibrating mass with the carrier body of the carrier flange; stiffening elements are inserted into the resilient body which serve as stiffening elements effective in the radial direction; additionally apertures are provided in the resilient body on both sides of the stiffening elements which enable an intentional reduction of its torsional stiffness so that a resonant frequency rate fr /ft of 2.5 or more can be realized for the vibration absorber.
22 citations
01 Jan 2004
TL;DR: In this paper, a design method based on the wave propagation approach is proposed, where active filters are used as shunting electronics to implement the tuning criteria and the developed tuning methods resulted in superior capabilities in minimizing structural vibration and noise radiation compared to other tuning methods.
Abstract: The use of shunted piezoelectric patches in reducing vibration and sound radiation of structures has several advantages over passive viscoelastic elements, e.g., lower weight with increased controllability. The performance of the piezoelectric patches depends on the shunting electronics that are designed to dissipate vibration energy through a resistive element. In past efforts most of the proposed tuning methods were based on modal properties of the structure. In these cases, the tuning applies only to one mode of interest and maximum tuning is limited to invariant points when based on den Hartog's invariant points concept. In this study, a design method based on the wave propagation approach is proposed. Optimal tuning is investigated depending on the dynamic and geometric properties that include effects from boundary conditions and position of the shunted piezoelectric patch relative to the structure. Active filters are proposed as shunting electronics to implement the tuning criteria. The developed tuning methods resulted in superior capabilities in minimizing structural vibration and noise radiation compared to other tuning methods. The tuned circuits are relatively insensitive to changes in modal properties and boundary conditions, and can applied to frequency ranges in which multiple modes have effects.
22 citations
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TL;DR: In this paper, a variable stiffness and damping isolator (VSDI) is proposed for vibration control in an integrated vibratory system, which consists of a traditional steel-rubber vibration absorber, as the passive element, and a magneto-rheological elastomer (MRE) as the semiactive element.
Abstract: This study presents the feasibility of a new variable stiffness and damping isolator (VSDI) in an integrated vibratory
system. The integrated system comprised of two VSDIs, a connecting plate and a mass. The proposed VSDI consists of
a traditional steel-rubber vibration absorber, as the passive element, and a magneto-rheological elastomer (MRE), with a
controllable (or variable) stiffness and damping, as the semi-active element. MREs' stiffness and damping properties
can be altered by a magnetic field. Dynamic testing on this integrated system has been performed to investigate the
effectiveness of the VSDIs for vibration control. Experimental results show significant shift in natural frequency, when
activating the VSDIs. Transmissibility and natural frequency of the integrated system are obtained from properties of
single device. The experimental and predicted results show good agreement between the values of the natural frequency
of the system at both off and on states. However, system damping predictions are different from experimental results.
This might be due to unforeseen effects of pre-stressed MREs and nonlinear material properties.
22 citations
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15 Apr 1985TL;DR: In this paper, the optimal passive vibration absorbers are designed for one and two WF structural representations using three parameter optimization techniques: minimum maximum steady-state response; pole placement; and quadratic cost minimization.
Abstract: The selection of the passive parameters for passive and active inertial vibration absorbers intended for use in large flexible space structures is investigated. Optimal passive vibration absorbers are designed for one and two WF structural representations using three parameter optimization techniques: minimum maximum steady-state response; pole placement; and quadratic cost minimization. The three techniques yield nearly identical results. Theoretically, a single mode damping ratio of 5% of critical damping can be achieved with a passive vibration absorber mas that is equal to 2% of the structural modal mass. Control actuators, which incorporate passive absorber components are also designed. Optimal gains for specific passive component values are determined using Linear Quadratic Regulator formulations. The optimal actuator is the one that's combined passive components and active gains minisizes the quadratic cost. The optimal actuator's passive design is near that of the optimal passive vibration absorber leading to a near optimal sequential design technique. Proof of concept laboratory tests were performed on a quasi free-free beaa. Electromagnetic, inertial-reaction devices usable in both active and passive configurations were implemented. Experimentally, a single mode damping of
22 citations