Vibration Characteristics of Plate Structures Embedded with Acoustic Black Holes and Distributed Dynamic Vibration Absorbers

2019 ◽  
Vol 24 (3) ◽  
pp. 531-539
Author(s):  
Xiuxian Jia ◽  
Yu Du ◽  
Ye Yu ◽  
Kunmin Zhao
Keyword(s):  
Vibration Response ◽  
Vibration Absorbers ◽  
Uniform Thickness ◽  
Frequency Range ◽  
Plate Structures ◽  
Design Constraint ◽  
Plate Structure ◽  
Dynamic Vibration ◽  
Dynamic Vibration Absorbers ◽  
Structural Mass

This study discusses a method of combining the acoustic black hole (ABH) concept and dynamic vibration absorbers (DVAs) together as a lightweight passive control approach for structural vibration and noise attenuation. Finite element (FE) simulations and experiments are used to compare vibration response levels of plate structures. The plate structures have been integrated with various vibration attenuation treatments including damping layers, DVAs, ABHs and ABH-DVA pairs. It is demonstrated experimentally that the plate structure integrated with two ABH-DVA pairs has the lowest overall vibration response level in the frequency range below 800 Hz. More interestingly, the total structural mass of the plate structure integrated with ABH-DVA pairs is 8.24% less than that of the uniform thickness plate. The experimental observations are further verified with simulation results. With the help of the FE model, plate structures integrated with more than two ABH–DVA pairs targeted at the simultaneous attenuation of multiple resonances are studied and compared with traditional uniform thickness plates. Under the design constraint of the total structural mass being equal, it is shown that plates integrated with DVA-ABH pairs always have lower vibration response levels in the low-mid frequency range where mechanical vibration commonly occurs.

scholarly journals Optimizations of distributed dynamic vibration absorbers for suppressing vibrations in plates

2018 ◽  
Vol 37 (4) ◽  
pp. 1188-1200 ◽  
Author(s):  
Xuezhi Zhu ◽  
Zhaobo Chen ◽  
Yinghou Jiao
Keyword(s):  
Vibration Control ◽  
Optimization Problems ◽  
Mode Shapes ◽  
Vibration Absorber ◽  
Superposition Method ◽  
Vibration Absorbers ◽  
Dynamic Vibration Absorber ◽  
Plate Structures ◽  
Dynamic Vibration ◽  
Dynamic Vibration Absorbers

Dynamic vibration absorber is an ideal device for vibration control at specific frequencies. In order to get a robust vibration control performance, multiple or distributed dynamic vibration absorbers are usually used for suppressing vibrations in plate structures. Optimization methods for the single dynamic vibration absorber in various vibration systems had been proposed many years ago. However, the analytical optimization solutions with respect to the distributed dynamic vibration absorbers for the plate structures have not been found. In this paper, the optimization problems of the distributed dynamic vibration absorbers for suppressing vibrations in plates are studied. Vibration equations of the plate carrying distributed dynamic vibration absorbers are established using modal superposition method. The similarities of vibration shapes of the dynamic vibration absorbers and mode shapes of the plate are revealed. According to the characteristics of the vibration shapes of dynamic vibration absorbers, the vibration equations of the plate carrying distributed dynamic vibration absorbers are transformed into a form of equations of a two degree of freedom system. The analytical optimization formulas of the distributed dynamic vibration absorbers for suppressing vibrations in plates are derived by applying the fixed-points theory. The effectiveness of the optimization formulas is verified through numerical simulations. The simulation results also show that a brilliant multi-mode vibration control can be realized by using the optimized distributed dynamic vibration absorbers.

Structural Optimization of Cantilever Mechanical Elements

1986 ◽  
Vol 108 (4) ◽  
pp. 427-433 ◽  
Author(s):  
Eugene I. Rivin
Keyword(s):  
Structural Optimization ◽  
Natural Frequencies ◽  
Superior Performance ◽  
Vibration Absorbers ◽  
Stability Margins ◽  
Dynamic Vibration ◽  
Robot Arms ◽  
Limited Effectiveness ◽  
Mass Ratios ◽  
Dynamic Vibration Absorbers

Naturally limited stiffness of cantilever elements due to lack of constraint from other structural components, together with low structural damping, causes intensive and slow-decaying transient vibrations as well as low stability margins for self-excited vibrations. In cases of dimensional limitations (e.g., boring bars), such common antivibration means as dynamic vibration absorbers have limited effectiveness due to low mass ratios. This paper describes novel concepts of structural optimization of cantilever components by using combinations of rigid and light materials for their design. Two examples are given: tool holders (boring bars) and robot arms. Optimized boring bars demonstrate substantially increased natural frequencies, together with the possibility of greatly enhanced mass ratios for dynamic vibration absorbers. Machining tests with combination boring bars have been performed in comparison with conventional boring bars showing superior performance of the former. Computer optimization of combination-type robot arms has shown a potential of 10–60 percent reduction in tip-of-arm deflection, together with a commensurate reduction of driving torque for a given acceleration, and a higher natural frequencies (i.e., shorter transients). Optimization has been performed for various ratios of bending and joint compliance and various payloads.

Dynamic Vibration Absorber Optimal Design With Emphasis on Complete Machine Dynamics Modelling

2008 ◽  
Author(s):  
Bohdan M. Diveyev ◽  
Zinovij A. Stotsko
Keyword(s):  
Optimal Design ◽  
Vibration Absorber ◽  
Vibration Absorbers ◽  
Rotating Machines ◽  
Dynamic Vibration Absorber ◽  
New Methods ◽  
Dynamic Vibration ◽  
Methods Development ◽  
Dynamic Vibration Absorbers ◽  
Dynamics Modelling

The main aim of this paper is improved dynamic vibration absorbers design with taking into account complex rotating machines dynamic The is considered for the complex vibroexitated constructions. Methods of decomposition and the numerical schemes synthesis are considered on the basis of new methods of modal methods. Development of of complicated machines and buildings in view of their interaction with system of dynamic vibration absorbers is under discussion.

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