| 预紧力对系统频率漂移的影响 |
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| 引用本文： | 李太平,翁海宽,江浩,洪岩,齐晓军.预紧力对系统频率漂移的影响[J].航天器环境工程,2017,34(6):636-641. |
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| 作者姓名： | 李太平 翁海宽 江浩 洪岩 齐晓军 |
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| 作者单位： | 1. 上海卫星装备研究所, 上海 200240;2. 上海裕达实业有限公司, 上海 200240 |
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| 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。
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| 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 |
| 收稿时间： | 2017/5/13 0:00:00 |
| 修稿时间： | 2017/11/30 0:00:00 |
The influence of preload on system frequency variations |
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| LI Taiping,WENG Haikuan,JIANG Hao,HONG Yan,QI Xiaojun.The influence of preload on system frequency variations[J].Spacecraft Environment Engineering,2017,34(6):636-641. |
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| Authors: | LI Taiping WENG Haikuan JIANG Hao HONG Yan QI Xiaojun |
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| Institution: | 1. Shanghai Institute of Satellite Equipment, Shanghai 200240, China;2. Shanghai Yuda Industrial Co., Ltd., Shanghai 200240, China |
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| Abstract: | 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. |
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| Keywords: | preload frequency variations resonance nonlinearity Harmonic spectrum estimation method simulation analysis test validation |
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