Dynamic Design And Experiment Of Nonlinear Whole-spacecraft Vibration Reduction And Energy Harvsting

In the process of launching heavy rocket,the dynamic environment is very bad,and the spacecraft components are prone to damage.Therefore,it is very urgent and necessary to improve the launching environment of heavy carrier rocket.In this paper,a new type of vibration isolation device with nonlinear energy sink of nickel titanium wire rope is designed and applied to the whole-spacecraft system.The response of the system is analyzed from the perspective of transmissibility by using the nonlinear output frequency response function.Secondly,an active negative stiffness isolator is proposed to be applied to the whole-spacecraft system.Such an active negative stifness isolator can adjust its own stiffness adaptively according to the different external excitation received by the system.The system has good vibration reduction performance.In addition,a new integrated vibration control and energy acquisition device for the whole star system is established.Compared with the previous integrated device of the whole-spacecraft system vibration control and energy acquisition,this device achieves the effect of the whole-spacecraft system vibration control and energy acquisition while reducing the overall structure.Then the harmonic balance method is used to analyze the response and energy acquisition of the whole-spacecraft system.Finally,the effects of different parameters on the vibration response and energy acquisition of the system are discussed.Finally,this paper also builds an integrated experiment platform for vibration reduction of the whole-spacecraft system with nonlinear energy well and energy acquisition of GMM.The vibrator is used for sinusoidal sweep excitation,the vibration signal is collected by LMS,and the energy signal is collected by oscilloscope.The experimental results show that the NES-GMM device has good vibration control effect and certain energy acquisition function.