摘要
文章采用Harmonic的谱估计方法,研究了系统不同构件之间通过螺钉连接时,预紧力对系统动态特性的影响。在预紧力相同的情况下,不同量级的外界激励,会造成系统表现出不同的频率响应特性,呈现非线性时不变特性;大量级的外界激励会造成系统预紧力"失效",刚度降低,导致系统的固有频率降低,产生频率漂移,在共振处放大倍数降低。
In this paper,the influence of the preload on the dynamic characteristics of a system with screw connections among different components is investigated with the harmonic spectrum estimation method.It is shown that with a preload of the same order of magnitude,the system exhibits different dynamic characteristics or FRFs under excitations of different orders of magnitude,as a non-linear time-invariant system.High level excitation may invalidate the preload,thus lead to reductions of the stiffness,the natural frequency,and the amplification in the resonance region.
作者
李太平
翁海宽
江浩
洪岩
齐晓军
LI Taiping;WENG Haikuan;JIANG Hao;HONG Yan;QI Xiaojun(Shanghai Institute of Satellite Equipment,Shanghai 200240, China;Shanghai Yuda Industrial Co., Ltd., Shanghai 200240, China)
出处
《航天器环境工程》
2017年第6期636-641,共6页
Spacecraft Environment Engineering
关键词
预紧力
频率漂移
共振
非线性
Harmonic谱估计方法
仿真分析
试验验证
preload
frequency variations
resonance
nonlinearity
Harmonic spectrum estimation method
simulation analysis
test validation
