Applied Mathematics and Mechanics (English Edition) ›› 2020, Vol. 41 ›› Issue (3): 383-400.doi: https://doi.org/10.1007/s10483-020-2588-9

• 论文 •    下一篇

Suppression of multiple modal resonances of a cantilever beam by an impact damper

Xiaofeng GENG1, Hu DING1, Kexiang WEI2, Liqun CHEN1   

  1. 1. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai Key Laboratory of Mechanics in Energy Engineering, School of Mechanics and Engineering Science, Shanghai University, Shanghai 200072, China;
    2. Department of Mechanical Engineering, Hunan Institute of Engineering, Xiangtan 411104, Hunan Province, China
  • 收稿日期:2019-10-31 修回日期:2019-12-23 出版日期:2020-03-01 发布日期:2020-02-17
  • 通讯作者: Hu DING E-mail:dinghu3@shu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (No. 11772181), the Program of Shanghai Municipal Education Commission (No. 2019-01-07-00-09-E0018), and the Key Research Projects of Shanghai Science and Technology Commission (No. 18010500100)

Suppression of multiple modal resonances of a cantilever beam by an impact damper

Xiaofeng GENG1, Hu DING1, Kexiang WEI2, Liqun CHEN1   

  1. 1. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai Key Laboratory of Mechanics in Energy Engineering, School of Mechanics and Engineering Science, Shanghai University, Shanghai 200072, China;
    2. Department of Mechanical Engineering, Hunan Institute of Engineering, Xiangtan 411104, Hunan Province, China
  • Received:2019-10-31 Revised:2019-12-23 Online:2020-03-01 Published:2020-02-17
  • Contact: Hu DING E-mail:dinghu3@shu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (No. 11772181), the Program of Shanghai Municipal Education Commission (No. 2019-01-07-00-09-E0018), and the Key Research Projects of Shanghai Science and Technology Commission (No. 18010500100)

摘要: Impact dampers are usually used to suppress single mode resonance. The goal of this paper is to clarify the difference when the impact damper suppresses the resonances of different modes. A cantilever beam equipped with the impact damper is modeled. The elastic contact of the ball and the cantilever beam is described by using the Hertz contact model. The viscous damper between the ball and the cantilever beam is modeled to consume the vibrational energy of the cantilever beam. A piecewise ordinary differential-partial differential equation of the cantilever beam is established, including equations with and without the impact damper. The vibration responses of the cantilever beam with and without the impact damper are numerically calculated. The effects of the impact absorber parameters on the vibration reduction are examined. The results show that multiple resonance peaks of the cantilever beam can be effectively suppressed by the impact damper. Specifically, all resonance amplitudes can be reduced by a larger weight ball. Moreover, the impacting gap is very effective in suppressing the vibration of the cantilever beam. More importantly, there is an optimal impacting gap for each resonance mode of the cantilever beam, but the optimal gap for each mode is different.

关键词: impact damper, cantilever beam, impacting gap, multiple modes, viscous damper

Abstract: Impact dampers are usually used to suppress single mode resonance. The goal of this paper is to clarify the difference when the impact damper suppresses the resonances of different modes. A cantilever beam equipped with the impact damper is modeled. The elastic contact of the ball and the cantilever beam is described by using the Hertz contact model. The viscous damper between the ball and the cantilever beam is modeled to consume the vibrational energy of the cantilever beam. A piecewise ordinary differential-partial differential equation of the cantilever beam is established, including equations with and without the impact damper. The vibration responses of the cantilever beam with and without the impact damper are numerically calculated. The effects of the impact absorber parameters on the vibration reduction are examined. The results show that multiple resonance peaks of the cantilever beam can be effectively suppressed by the impact damper. Specifically, all resonance amplitudes can be reduced by a larger weight ball. Moreover, the impacting gap is very effective in suppressing the vibration of the cantilever beam. More importantly, there is an optimal impacting gap for each resonance mode of the cantilever beam, but the optimal gap for each mode is different.

Key words: impact damper, cantilever beam, impacting gap, multiple modes, viscous damper

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