309 カオス振動を利用した弦拘束弓状はり動吸振器の実験

概要

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A new type of vibration-absorber is proposed using dynamic characteristics of chaotic vibration generated by a bowed-type beam constrained with stretched strings. Main purpose of the vibration-absorber is to decrease the amplitude of response of elastic structure, which is the target of vibration-absorber, within broader frequency range. The bowed-typed beam is deformed to a curved configuration by the strings which are stretched between the both tip ends of the beam. The center of the bowed-type beam is connected to an elastic structure. The elastic structure consists of the moving block and elastic plate. Non-periodic responses of the bowed-type beam are generated within broader frequency range of excitation. The amplitude of periodic response of the elastic structure is decrease sufficiently. To confirm the mechanism of the vibration-absorber, the non-periodic responses are examined by the Fourier spectrum, the maximum Lyapunov exponent and the principal component analysis. It is found that modal coupling of symmetrical vibration and asymmetrical vibration is generated within chaotic response of the absorber. The modal coupling is efficiently suppressing the vibration-amplitude on the elastic structure.
一般社団法人日本機械学会の論文
2011-09-05