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基于振动响应特性的结构随机振动损伤分析 被引量:2

The Structural Fatigue Damage Analysis of Random Vibration Based on Response Characteristics
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摘要 针对某航天器结构的随机振动疲劳损伤问题进行了研究。采用ANSYS软件建立了某航天器结构的有限元模型,并模拟振动台试验条件对其进行了多点激励随机振动响应分析;然后,根据振动响应结果得到结构敏感频率;并在现有样本法的基础上进一步考虑了振动敏感频率和平均应力对疲劳损伤的影响。具体通过在敏感频率附近密集采样而在远离敏感频率范围内稀疏采样的方式得到时域载荷谱;进而采用雨流法得到有效载荷谱,并结合Miner线性累积损伤理论和Soderberg方程估算了结构的疲劳损伤。最后将该方法计算的结果与Steinberg三区间法和现有样本法所得结果进行了对比,结果表明采用本文改进的样本法在少量取样情况下的损伤计算结果就能与三区间法基本一致,从而验证了该方法的适用性。相比较现有样本法,该方法既大大减少了工作量又提高了计算精度。 The fatigue damage analysis of a spacecraft structure under random vibration is discussed in the paper. Firstly, the finite element model of a spacecraft structure is built by ANSYS software, and the random vibration response under multi-support excitation is calculated by simulating shaking table test. Secondly, according to random vibration response, the sensitive frequency range of the response is obtained. Then, effect of the sensitive frequency range and mean stress on vibration fatigue damage is further considered on the basis of existing Sample Approach. Accordingly, the random vibration loading in frequency domain is converted to the random load spectrum in time domain with improved Sample Approach by dense sampling near the sensitive frequency and sparse sampling far from the sensitive frequency. Then, the effective load spectrum is obtained by using the rain/low counting algorithms, and the structural fatigue damage is calculated by the Miner theory and Soderberg equation. Finally, the result calculated by this improved approach is compared with that calculated by the Steinberg's Three-interval method and existing Sample Approach. The result shows that fatigue damage calculated hy improved Sample Approach in the case of small sample is very close to the result by Steinberg's Three-interval method, which proves the applicability of the proposed method. Compared with existing Sample Approach, this improved approach not only reduces the workload greatly but also improves the computational accuracy.
作者 陈华 胡伟平 马爱军 李广利 詹志新 孟庆春 CHEN Hua1 , HU Weiping1, MA Aijun2 , LI Guangli2 , ZHAN Zhixin1 , MENG Qingchun1 (1, School of Aeronautics Science andEngineering,Beijing University of Aeronautics and Astronautics,Beijing 100191, China; 2. Astronaut Research and Training Center of China, Beijing 100094, China)
出处 《机械设计与研究》 CSCD 北大核心 2017年第3期21-25,共5页 Machine Design and Research
关键词 随机振动 功率谱密度 振动响应 样本法 雨流法 疲劳损伤 random vibration power spectral density vibration response sample approach rainflow counting algorithms fatigue damage
作者简介 陈华(1992-),男,硕士生;主要研究方向:损伤力学,已发表论文1篇。
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