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Title |
Impact Evaluation of Rubber Type, Hardness and Induced Prestress Force on the Dynamic Properties of a Damper
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Authors |
임채림(Chae-Rim Im) ; 양근혁(Keun-Hyeok Yang) ; 문주현(Ju-Hyun Mun) ; 원은비(Eun-Bee Won) |
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DOI |
https://doi.org/10.11112/jksmi.2022.26.6.167 |
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Keywords |
고무; 동적특성평가; 감쇠장치; 증폭계수 Rubber; Dynamic property; Damper; Amplification factor |
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Abstract |
The objective of this study is to evaluate the dynamic properties of DUS (damping-up system) composed of the materials with excellent damping capacity, and to compare with those of the conventional hangar bolt. The main parameters are the type and hardness ($\eta_{H}$), of rubber and the prestress force (value converted from the compression strain ($\eta_{R}$) in the stress?strain relationship of rubber). The dynamic properties were examined from the natural frequency ($\omega_{n}$), maximum response acceleration ($A_{m}$), amplification coefficient ($\alpha_{p}$), maximum relative displacement ($\Delta_{m}$), and damping ratio ($\xi_{D}$). The test results showed that the $A_{m}$, $\alpha_{p}$, and $\Delta_{m}$ values of DUS were 46.3\%, 46.6\% and 62.9\% lower, respectively, and the $\xi_{D}$ value was 3.89 times higher, when compared to those of the conventional hangar bolt. In particular, the $\alpha_{p}$ value was 1.3 for DUS, and 2.45 for the conventional hanger bolt, which were similar to those of rigid and flexible components specified in KDS 41 17 00, respectively. Consequently, in the optimal details of DUS, the $\eta_{H}$ values of 50 and 45 were required for the NR (natural rubber) and EPDM (ethylene propylene diene monomer), and the $\eta_{R}$ value of 5\% was also recommended.
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