VIBRATION CONTROL DEVICE OF SPACECRAFT ONBOARD

摘要

PURPOSE: To surely prevent resonance of onboard equipment by providing a weight supported by a buffer means which vibrates at the same frequency as and in opposite phase to the resonance frequency of the onboard equipment and a guide rail for guiding the weight in the direction of vibration, and providing a bearing means between the guide rail and the weight. ;CONSTITUTION: In a vibration control device for preventing resonance of a spacecraft 1 and onboard equipment 3, a weight 5 supported on a coil spring 4 is guided in the direction of resonance of the onboard equipment 3 by a direct driven rolling bearing 6 and a guide rail 7. The mathematical model of the vibration system comprises a mass m₁ corresponding to the onboard equipment 3, a spring constant K₁ of the equipment structure system, the mass m₂ of the vibration control device and a spring constant K₂ of the vibration control device structure system. When the mass m₁ is acted upon by an excitation of PCosωt, the mass m₂ of the weight is set such that the characteristic frequency ω₂= K₂1/2/m₂ of the m₂K₂ system equals the excitation frequency ωand then the steady displacement X₁, X₂ of m₁, m₂ becomes X₁=0 and X₂=-P/K₂ and the exciting force P balances the spring forces X₂, K₂, whereby resonance of the onboard equipment 3 can be prevented.;COPYRIGHT: (C)1993,JPO&Japio