[논문]Auto-tuning of a two-degree-of-freedom rotational pendulum absorber

doi:10.1016/j.jsv.2012.02.021

Auto-tuning of a two-degree-of-freedom rotational pendulum absorber

Journal of sound and vibration, v.331 no.13, 2012년, pp.3020 - 3034

Abstract ▼ AI-Helper

AbstractA dynamic vibration absorber is effective in suppressing harmonic excitation by tuning its natural frequency to match the excitation frequency. The rotational pendulum absorber (RPA) has a wide-range of natural frequencies that are continuously tunable by setting a suitable rotational speed. In this paper it is shown how to automatically tune the rotational speed of a two-degree-of-freedom RPA by detecting the phase between the vibration of the primary structure and that of the RPA. For this purpose the speed response of the RPA is introduced in addition to the frequency response. It is seen that if the excitation frequency is above a critical value dependent on the parameters of the RPA, the second vibration mode of the RPA is effective, allowing a relatively low rotational speed for the pendulums. The speed tuning algorithm is tested on a flexible plate that is subject to excitations of around 80Hz, which do not generate visible oscillations but emit audible noise instead. Experimental results confirm the noise-level reduction effect of the RPA. Highlights► The rotational pendulum absorber has a wide range of natural frequencies. ► The natural frequency is continuously tunable by setting the rotational speed. ► An automatic speed tuning algorithm is developed via a phase detector. ► The device is tested on a flexible plate subject to noisy excitations. ► Noise level is significantly reduced as the absorber is properly tuned.

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표제어: PCR

동의어: Packet Collision Rate

용어 설명 출처 목록 (6)

용어 설명: PCR은 세균 특이성이 있는 primer를 이용하여 적은 수의 세균이 있을지라도 쉽게 검출할 수 있는 유용한 방법이며, 이를 이용하여 구강 내 치면세균막이나 타액에서 직접 세균을 검출할 수 있게 되었다[8].

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Auto-tuning of a two-degree-of-freedom rotational pendulum absorber

Abstract ▼ AI-Helper

참고문헌 (23)

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