摘要
利用基于模态应变能的损伤识别方法,对火箭蒙皮上L型梁进行损伤识别方法的可行性研究。该损伤识别方法以结构损伤导致模态参数变化为依据,通过对比损伤前后模态应变能变化率以及模态应变能曲率差构建损伤识别指标。在无噪声的情况下,两个指标都能较准确地识别及定位出损伤,且模态应变能曲率差的识别效果要好于模态应变能变化率。最后在随机噪声的情况下,发现两个指标在模态数据测试较多及噪声水平不是很高的情况下,识别效果较好。
The feasibility study of the damage identification method of L-shaped beam on rocket skin is studied using the method of damage identification based on modal strain energy. The damage identification method is based on the change of modal parameters caused by structural damage. The damage identification index is constructed by comparing the modal strain energy change rate and the modal strain energy curvature difference before and after the damage. In the absence of noise, both indicators can accurately identify and locate the damage, and the recognition performance of the modal strain energy curvature difference is better than that of the modal strain energy change rate. Finally, in the case of random noise, it is shown that the two indicators have better recognition performance when the modal data is tested and the noise level is not very high.
作者
陈家照
毛行
CHEN Jiazhao;MAO Hang(Institute of Missile Engineering, Rocket Force University of Engineering, Xi＇an 710025, China)
出处
《噪声与振动控制》
CSCD
2018年第A02期694-698,共5页
Noise and Vibration Control
关键词
振动与波
L型梁
结构损伤识别
模态应变能变化率
模态应变能曲率差
随机噪声
vibration and wave
L-shaped beam
structural damage identification
modal strain energy change rate
modal strain energy curvature difference
random noise
