摘要
为缩减惯性导航平台的共振带宽并抑制平台角偏移,以减振系统三向等刚度为技术目标,分析了平台减振器传统布置方式的缺点,提出将8个减振器在平台台体顶端部位斜角布置,系统满足振动解耦的条件且符合三向等刚度要求,并采用有限元模型进行了数值仿真。模态分析结果表明,改进布置方式后,平台系统3个线振动固有频率以及3个角振动固有频率基本相等,系统的共振频率点由传统布置方式的4个降低至2个,且共振频率点覆盖的频带宽度大幅降低。随机振动分析显示,采用斜角布置方式后平台加速度响应均方根值降低了30.09%。由此可见,平台减振器斜角布置方式与传统布置方式相比,在缩减共振带宽、降低振动量级方面具有明显优势。
In order to reduce resonant bandwidth and restrict angular displacement,the vibration damping system of an inertial navigation platform should possess tri-directive equal stiffness as far as possible.The disadvantages of traditional placement for rubber dampers are analyzed,and a new placement method for rubber dampers to achieve tri-directive equal stiffness is proposed.This method involves fixing the eight dampers at an incline on the vertexes of the platform.The vibration system is decoupled under such conditions,and tri-directive equal stiffness can be achieved.Numerical simulation is carried out using the finite element model.The results of modal analysis show that with the new placement method,the three transla-tional vibration frequencies as well as the three angular vibration frequencies are almost identical.In addition,the resonant frequencies decrease from 4to 2,and random vibration analysis indicates that the level of vibration is reduced by 30.09%.
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2014年第3期447-451,587-588,共5页
Journal of Vibration,Measurement & Diagnosis
基金
国家自然科学基金资助项目(10902024)
教育部新世纪优秀人才支持计划资助项目(NCET-11-0086)
江苏省自然科学基金资助项目(BK2010397)
航空科学基金资助项目(20090869009)
关键词
惯性导航平台
三向等刚度
橡胶减振器
斜角布置
inertial navigation platform
tri-directive equal stiffness
rubber damper
inclined placement
作者简介
周亚东，男，1987年9月生，博士研究生。主要研究方向为结构动力学与振动控制。曾发表《惯性导航平台角振动抑制技术》（《东南大学学报：自然科学版》2013年第43卷第1期）等论文。E-mail：tunie-chou@126．com
