Payload noise suppression using distributed active vibration absorbers

2002 ◽  
Author(s):  
Stephen D. O'Regan ◽  
Bart Burkewitz ◽  
Christopher Fuller ◽  
Steven A. Lane ◽  
Marty Johnson
Keyword(s):  
Noise Suppression ◽  
Vibration Absorbers ◽  
Active Vibration

scholarly journals Damping in magnetorheological elastomers under compressive stress

2019 ◽  
Vol 254 ◽  
pp. 06002 ◽  
Author(s):  
Mateusz Kukla ◽  
Krzysztof Talaśka ◽  
Ireneusz Malujda
Keyword(s):  
Smart Materials ◽  
Hysteresis Loops ◽  
Machine Construction ◽  
Vibration Absorbers ◽  
Magnetorheological Elastomers ◽  
Practical Applications ◽  
Mechanical Hysteresis ◽  
Compressive Stresses ◽  
Active Vibration ◽  
Energy Absorbers

Magnetorheological elastomers are an important area of study in non-classical engineering materials. These are smart materials, in which some of the physical properties are dependent on the applied magnetic field. This unique property allows to suggest new, innovative practical applications. It is therefore relevant to carry out studies in the possible application of magnetorheological elastomers in machine construction. The present article presents the results of study regarding the properties of the discussed materials subject to compressive stresses. Particular attention is given to the observed growth of surface area of mechanical hysteresis loops, which is evidence of the possibility to change the damping properties of magnetorheological elastomers. This property can be utilized in the construction of different types of machines and devices. These mostly applies to energy absorbers such as active vibration absorbers.

Active control of payload fairing noise using distributed active vibration absorbers

2003 ◽  
Vol 113 (4) ◽  
pp. 2251-2251
Author(s):  
Arnaud Charpentier ◽  
Marty E. Johnson ◽  
Chris R. Fuller
Keyword(s):  
Active Control ◽  
Vibration Absorbers ◽  
Active Vibration ◽  
Payload Fairing

Passive, Adaptive and Active Tuned Vibration Absorbers—A Survey

1995 ◽  
Vol 117 (B) ◽  
pp. 234-242 ◽  
Author(s):  
J. Q. Sun ◽  
M. R. Jolly ◽  
M. A. Norris
Keyword(s):  
Recent Progress ◽  
Noise Suppression ◽  
Vibration Absorbers ◽  
Optimal Tuning ◽  
Tuned Vibration Absorbers ◽  
On Line ◽  
Fail Safe

An overview of the recent development of tuned vibration absorbers (TVAs) for vibration and noise suppression is presented. The paper summarizes some popular theory for analysis and optimal tuning of these devices, discusses various design configurations, and presents some contemporary applications of passive TVAs. Furthermore, the paper also presents a brief discussion on the recent progress of adaptive and semi-active TVAs along with their on-line tuning strategies, and active and hybrid fail-safe TVAs.

Active vibration control of a shaft bracket-plate coupled system

2021 ◽  
pp. 147509022110332
Author(s):  
Dequan Yang ◽  
Xiling Xie ◽  
Mingke Ren ◽  
Zhiyi Zhang
Keyword(s):  
Vibration Control ◽  
Plate Theory ◽  
Active Vibration Control ◽  
Beam Theory ◽  
Experimental System ◽  
Coupled System ◽  
Plate Vibration ◽  
Vibration Absorbers ◽  
Thin Plate Theory ◽  
Active Vibration

Active vibration control of a shaft bracket-plate coupled system is investigated. The vibration of the plate is controlled with electromagnetic vibration absorbers (EVAs), which are mounted around the feet of the shaft bracket to impede the transmission of vibration from the bracket apex to the plate. A dynamic model is established on the Timoshenko beam theory and the Kirchhoff thin plate theory to reveal the mechanism of vibration transmission. It is exhibited that all the induced forces and moments at the coupling points contribute much to the transverse responses of the plate. The feasibility of active control with the EVAs is evaluated numerically based on the controllability of the plate vibration. It is demonstrated that the two-point in-plane control is able to attenuate the plate vibration under the excitation of in-plane disturbance forces, while the multi-point control is effective in reducing the plate vibration regardless of the directions of disturbance forces. An experimental system is built to verify the performance of the two-point in-plane control. The results have shown that with the help of adaptive control, the two-point in-plane control is capable of suppressing the vibration of the foundation induced by the in-plane forces acting on the shaft bracket.

New Control Algorithms for Semi-Active Dynamic Vibration Absorbers

1995 ◽  
Author(s):  
M. Abé ◽  
T. Igusa
Keyword(s):  
Vibration Absorber ◽  
Vibration Absorbers ◽  
Dynamic Vibration Absorber ◽  
Single Degree Of Freedom ◽  
Dynamic Vibration ◽  
Passive Devices ◽  
Active Vibration ◽  
Zero Values ◽  
Dynamic Vibration Absorbers ◽  
Insight Into

Abstract A semi-active dynamic vibration absorber is proposed for controlling the free-vibration impulse response of structures. It is assumed that (i) the initial displacement for the absorber spring can be set to non-zero values and (ii) the viscous damping coefficient for the absorber damping can be adjusted. The theory is first developed for a single-degree-of-freedom structure, and is then generalized to continuous structures. The extensive use of closed-form analytical results provides useful insight into the complex interaction between the structure and absorber. This makes it possible to solve the design problem without recourse to numerical optimization. The semi-active vibration absorber is found to be far more effective than conventional passive devices.

Relative Stability Analysis for Vibration Absorbers With Multiple Delayed Feedback

2000 ◽  
Author(s):  
Chang Huang ◽  
Nejat Olgac
Keyword(s):  
Relative Stability ◽  
Time Delays ◽  
A Priori ◽  
System Stability ◽  
Vibration Absorbers ◽  
Vibration Absorption ◽  
Stability Chart ◽  
On Line ◽  
Active Vibration ◽  
Operating Points

Abstract A novel tuning methodology for active vibration absorption is discussed. The underlying proposition is to use partial state feedback with multiple unrelated time delays. The objective of this tuning is to combat excitation forces with multiple frequencies, which are time varying. It is shown that the required control parameters can be evaluated on-line rather rapidly. The system stability aspect however, needs to be resolved a priori to the control actuation. This is the challenge facing this procedure due to the presence of multiple (and mostly “unrelated”) time delays. A new stability assessment methodology, the Directional Stability Chart method, is presented. The outcome of this procedure is used to determine the local stability levels and preferred operating zones in the domain of the multiple excitation frequencies. The method is also expanded to assess the relative stability level of the tuned absorber. Example case is taken from a PZT actuated active absorber. Desirability of the operating points are compared based on the relative stability levels, and the observations are verified by simulations.

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