Vibration Control Using an Impact Damper System  -Comparison between Translating Impactor and Rotating Impactor, and Improvement of Rotating Impactor-

Nagashima, Takaaki; Sato, Taichi; Tanaka, Kihachiro

doi:10.1299/jee.5.402

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…Nagashima and et al investigate the damping characteristics of an ID system when using a translating impactor and rotating impactor. 46 This investigation shows that the damping characteristics of an ID using a rotating impactor are insensitive between the impactor and the base surface.…”

Section: Introductionmentioning

confidence: 82%

Experimental and analytical investigation of impact dampers in free vibration reduction with coulomb friction

Safaeifar¹,

Farshidianfar

2021

Noise & Vibration Worldwide

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The presence of vibration in structures and machines can establish failures and reduce the efficiency. Passive dampers have been used extensively for vibration control because of their simple concept. One of these dampers is impact damper (ID). Impact dampers are suitable to operate in harsh environments and effective over a wide range of frequencies. In this paper, the experimental and theoretical investigation on the effect of the ID in free vibration of a cantilever beam is done. The lateral motion of the free end of the cantilever beam is modeled as one degree of freedom (1-DOF) system. The motion of the 1-DOF system equipped with the ID with Coulomb friction is studied analytically. Free vibration of cantilever beam investigated experimentally. The experimental results are presented and discussed. The damping inclination of the ID in various experimental and theoretical studies is proposed. The results show the validation between the experimental and the theoretical studies.

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Section: Introductionmentioning

confidence: 82%

Experimental and analytical investigation of impact dampers in free vibration reduction with coulomb friction

Safaeifar¹,

Farshidianfar

2021

Noise & Vibration Worldwide

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Damping Effects of Impact Damper System with Multi-Impactor

Nagashima

Sato²,

Tanaka³

2011

Trans.JSME(C)

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We made a test apparatus which consists of a cantilevered beam onto which a primary mass with an impact damper was attached to the free end of the beam. We measured the acceleration time history of the primary mass when the frequency of the foundation excitation was swept up under the constant magnitude of the acceleration of the foundation while changing the clearance between the impactor and the wall of the primary system. The experimental tests indicate that the acceleration level decreases at resonance when the number of the impactor increases. We also created a simulation program to calculate the vibration response of the impact damper, and verified that the calculation result was in accordance with the experimental one. Furthermore, we calculated mechanical energy of the vibration system to explain the mechanism of damping in the case of multi-impactor.

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Simultaneous Vibration Control Using an Impact Damper System in Horizontal and Vertical Directions

Nagashima

Sato²,

Tanaka³

2011

Trans.JSME(C)

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We applied the impact damper system to the vibration model of a cantilever beam. The impact damper system consists of an impactor and walls placed in a container, which vibrates in the horizontal and vertical directions when the first and second modes of vibration are excited at the same time. The damping effects are influenced by a clearance between an inpactor and walls of a container. We changed the clearance and the acceleration of the foundation and investigated the damping characteristics of the impact damper system when the system vibrated in two directions at the same time. We calculated the vibration response of the impact damper numerically, and found that the calculation results were in accordance with the experimental ones. The impact damper system converts the vibration energy of the vibrating body to the kinetic energy of the impactor by collision. Therefore, to investigate the damping effects of two directions in the simultaneous vibration, we calculated the mechanical energy of the vibration system. We found that the damping effects of the horizontal direction were not affected by the vertical vibration when a horizontal clearance was larger than the optimum clearance. On the other hand, we found that the damping effects of vertical direction were not affected by the horizontal vibration when the impactor did not collide to the ceiling. In other words, we found that using an impactor reduced the vibrations of both the horizontal and the vertical direction at the same time when the clearance was properly adjusted.

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Vibration Control Using an Impact Damper System -Comparison between Translating Impactor and Rotating Impactor, and Improvement of Rotating Impactor-

Cited by 4 publications

References 5 publications

Experimental and analytical investigation of impact dampers in free vibration reduction with coulomb friction

Experimental and analytical investigation of impact dampers in free vibration reduction with coulomb friction

Damping Effects of Impact Damper System with Multi-Impactor

Simultaneous Vibration Control Using an Impact Damper System in Horizontal and Vertical Directions

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