仪器舱舱段局域共振单元减振设计  

Vibration reduction design of local resonance unit in instrument cabin

作　　者：郭慧婷 董龙雷[1] 周嘉明 胡迪科 赵建平[1] GUO Huiting;DONG Longlei;ZHOU Jiaming;HU Dike;ZHAO Jianping(School of Aerospace Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Shanghai Institute of Astronautical Systems Engineering,Shanghai 201109,China)

机构地区：[1]西安交通大学航天航空学院,西安710049 [2]上海宇航系统工程研究所,上海201109

出　　处：《振动与冲击》2022年第17期313-319,共7页Journal of Vibration and Shock

基　　金：运载典型舱段减振设计与验证研究项目。

摘　　要：仪器舱是运载火箭的关键结构,仪器舱的振动会影响电子设备的可靠性,因此,改善仪器舱的振动环境具有重要意义。介绍了一种螺旋型局域共振单元,并分析了其减振机理,提出将该局域共振单元应用到仪器舱减振上。以仪器舱缩比结构为对象进行仿真方法验证,建立并修正了缩比结构的有限元模型,分析了局域共振单元对缩比模型的减振效果,结果表明在20~200 Hz内结构的振动衰减可以达到30%。对局域共振单元和缩比模型进行加工并开展声激励试验,试验结果表明振动衰减达到30%以上,与仿真分析相吻合,从而验证了仿真方法的正确性和合理性。将该方法推广到仪器舱减振分析上,仿真结果表明在20~250 Hz内该局域共振单元对仪器舱的减振可达40%。Instrument cabin is key structure of carrier rocket.Its vibration can affect reliability of electronic equipment.Thus,it is of great significance to improve its vibration environment.Here,a helical local resonance unit was introduced,and its vibration reduction mechanism was analyzed.This local resonance unit was proposed to be applied in vibration reduction of instrument cabin.Firstly,the scaled structure of instrument cabin was taken as the study object to do the verification of simulation method,the finite element model of the scaled structure was established and modified,and the vibration reduction effect of the local resonance element on the scaled model was analyzed.The results showedthat the vibration attenuation of the structure can reach 30%within the range of 20-200 Hz.Then,the local resonance unit and the reduced scale model were processed to conduct acoustic excitation tests.The test results showed that the structure’s vibration attenuation is more than 30%to agree well with that obtained usingsimulation analysis,so the correctness and rationality of the simulation method are verified.Finally,the proposed method was extended to vibration reduction analysis of instrument cabin.The simulation results showedthat vibration reduction of instrument cabin with local resonance unit can reach 40%within the range of 20-250 Hz.

关 键 词：局域共振 减振 仪器舱 运载火箭 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3