Experimental Study on Frequency Band of Dynamic Vibration Absorber in Pipe Systems

2016 ◽  
Author(s):  
Xiufeng Yang ◽  
Lidong He ◽  
Bingkang Zhang
Keyword(s):  
Vibration Suppression ◽  
Single Layer ◽  
Chemical Equipment ◽  
High Mass ◽  
Vibration Absorber ◽  
Dynamic Vibration Absorber ◽  
Dynamic Vibration ◽  
Particle Damping ◽  
New Type ◽  
Pipe Vibration

This paper investigated the vibration control mechanism of dynamic vibration absorber (DVA) used in pipelines and other chemical equipment. For investigating the broadband characteristics, a pipe-vibration absorber test bench was built and different tests were carried out. The results showed that high mass ratio could widen the frequency bandwidth of effective vibration suppression. A new type of passive ring-shaped DVA with particle damping, employing moving steel particles in single-layer or more-layers boxes was designed, and its vibration suppression capability tested and compared with traditional DVA. The proposed damped DVA could reduce the pipeline double vibration peaks typical of the traditional DVAs. Moreover, results showed that stratifying the box was a useful method to improve the vibration suppression efficiency that increased from 59.5% (single-layer-box case) to 72.5% when two-layers-box were used and to 78.5% with three-layers-box.

A New Type Dynamic Vibration Absorber to Reduce Broad-Band Vibration in Plates

2010 ◽  
Vol 148-149 ◽  
pp. 485-497
Author(s):  
He Ye Xiao ◽  
Mei Ping Sheng ◽  
Ye Lei
Keyword(s):  
Broad Band ◽  
Optimization Method ◽  
Vibration Energy ◽  
Vibration Absorber ◽  
Variable Cross ◽  
Dynamic Vibration Absorber ◽  
Rubber Layer ◽  
Dynamic Vibration ◽  
New Type ◽  
Multi Mode

A new type dynamic vibration absorber, which consists of steel layer and variable cross section rubber layer fitted to plate by bolt through L-shape connection, is introduced firstly and applied to control vibration of plates at multi mode frequencies in this paper. The aim of the present paper is to study the energy absorbing ability of the new type dynamic vibration absorber and apply optimization method to obtain parameters of absorber which is excellent in absorbing energy. The coupling model of composite beam and plate is established by power flow method and energy of plate attenuated by absorber is analyzed. To improve energy dissipated by absorber, the particle swarm method is used to optimize parameters of absorber to minimize vibration energy of the plate. An experiment is executed to certificate the energy mitigated by absorber to validate analytical modeling method. The test data are consistent with the analytical results, demonstrating that the new type dynamic vibration absorber can suppress the vibration energy at every mode of plate and achieve a goal of multi-mode control.

scholarly journals Optimal parameters of dynamic vibration absorber for linear damped rotary systems subjected to harmonic excitation

2020 ◽  
Author(s):  
Vu Duc Phuc ◽  
Tong Van Canh ◽  
Pham Van Lieu
Keyword(s):  
Vibration Suppression ◽  
Fixed Point Theory ◽  
Damping Ratio ◽  
Harmonic Excitation ◽  
Tuning Parameter ◽  
Vibration Absorber ◽  
Optimal Parameters ◽  
Dynamic Vibration Absorber ◽  
Practical Applications ◽  
Dynamic Vibration

Dynamic vibration absorber (DVA) is a simple and effective device for vibration absorption used in many practical applications. Determination of suitable parameters for DVA is of significant importance to achieve high vibration reduction effectiveness. This paper presents a   method to find the optimal parameters of a DVA attached to a linear damped rotary system excited by harmonic torque. To this end, a closed-form formula for the optimum tuning parameter is derived using the fixed-point theory based on an assumption that the damped rotary systems are lightly or moderately damped. The optimal damping ratio of DVA is found by solving a set of non-linear equations established by the Chebyshev's min-max criterion. The performance of the proposed optimal DVA is compared with that obtained by existing optimal solution in literature. It is shown that the proposed optimal parameters are possible to obtain superior vibration suppression compared to existing optimal formula. Extended simulations are carried out to examine the performance of the optimally designed DVA and the sensitivity of the optimum parameters. The simulation results show that the improvement of the vibration performance on damped rotary system can be as much as 90% by using DVA.

Study on the vibration suppression of a flexible carbody for urban railway vehicles with a magnetorheological elastomer-based dynamic vibration absorber

2019 ◽  
Vol 234 (7) ◽  
pp. 749-764 ◽  
Author(s):  
Yongpeng Wen ◽  
Qian Sun ◽  
Yu Zou ◽  
Haoming You
Keyword(s):  
Vibration Suppression ◽  
Design Method ◽  
Elastic Vibration ◽  
Parameter Determination ◽  
Railway Vehicle ◽  
Vibration Absorber ◽  
Magnetorheological Elastomer ◽  
Dynamic Vibration Absorber ◽  
Optimum Frequency ◽  
Dynamic Vibration

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 controllable shear modulus of magnetorheological elastomer is widely used in vibration systems. In the study, a flexible carbody model with a magnetorheological elastomer dynamic vibration absorber is established. A design method of a semiactive dynamic vibration absorber that is based on magnetorheological elastomer is introduced, and the operational principle of the semiactive dynamic vibration absorber is also discussed. To improve the vibration absorption performance of the magnetorheological elastomer dynamic vibration absorber, via multiple regression analysis, the optimal design frequency expressions for both the rigid vibration and the elastic vibration of the carbody are fitted. Parameter determination for the magnetorheological elastomer dynamic vibration absorber is investigated in detail. Then, the effects on the rigid vibration and the elastic vibration with the magnetorheological elastomer vibration absorber both with the passive vibration absorber and without a vibration absorber are analyzed. Finally, Sperling’s riding index is used to evaluate the feasibility and the performance of the magnetorheological elastomer dynamic vibration absorber in a practical application. The results demonstrate that the vibration of the carbody can be effectively reduced by using the magnetorheological elastomer dynamic vibration absorber instead of the dynamic vibration absorber without the magnetorheological elastomer. The magnetorheological elastomer dynamic vibration absorber that is modified by the optimum frequency provides superior vibration reduction performance and improves the riding quality of the railway vehicle.

Adaptive dynamic vibration absorber based on a new type of smart material

2017 ◽  
Vol 65 (3) ◽  
pp. 191-196 ◽  
Author(s):  
Weizhi Song ◽  
Yanqing Zhao ◽  
Haijun Zhao ◽  
Hui Zhou ◽  
Kai Laing
Keyword(s):  
Smart Material ◽  
Vibration Absorber ◽  
Dynamic Vibration Absorber ◽  
Adaptive Dynamic ◽  
Dynamic Vibration ◽  
New Type

149 Vibration Suppression of Tilted Vibration System by Dynamic Vibration Absorber with Two Rollers

2004 ◽  
Vol 2004 (0) ◽  
pp. _149-1_-_149-6_
Author(s):  
Yilin SONG ◽  
Hidenori SATO ◽  
Yoshio IWATA ◽  
Toshihiko KOMATSZAKI ◽  
Yoshiyuki KISHIMOTO
Keyword(s):  
Vibration Suppression ◽  
Vibration Absorber ◽  
Vibration System ◽  
Dynamic Vibration Absorber ◽  
Dynamic Vibration

scholarly journals Friction-Induced Vibration Suppression via the Tuned Mass Damper: Optimal Tuning Strategy

Lubricants ◽  
2020 ◽  
Vol 8 (11) ◽  
pp. 100
Author(s):  
Jia Lin Hu ◽  
Giuseppe Habib
Keyword(s):  
Vibration Suppression ◽  
Vibration Absorber ◽  
Vibration Absorbers ◽  
Dynamic Vibration Absorber ◽  
Restoring Force ◽  
Stick Slip ◽  
Optimal Tuning ◽  
Dynamic Vibration ◽  
Tuning Strategy ◽  
Friction Induced Vibration

Friction-induced vibrations are a significant problem in various engineering applications, while dynamic vibration absorbers are an economical and effective tool for suppressing various kinds of vibrations. In this study, the archetypal mass-on-moving-belt model with an attached dynamic vibration absorber was considered. By adopting an analytical procedure, the optimal tuning of the absorber’s parameters was defined. Furthermore, the bifurcations occurring at the loss of stability were analytically investigated; this analysis illustrated that a properly chosen nonlinearity in the absorber’s stiffness permits controlling the supercritical or subcritical character of the bifurcation. However, a numerical analysis of the system’s dynamics, despite confirming the analytical results, also illustrated that the system’s global behavior is only slightly affected by the bifurcation character. Indeed, a dynamic vibration absorber possessing a perfectly linear restoring force function seems to provide the optimal performance; namely, it minimizes the velocity range for which stick–slip oscillations exists.

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