摘要
基于超静定方程组的最小二乘法对飞行器遥测低频振动数据进行了分析,求得振动模态的广义坐标,再根据模态叠加法对中心吸气式飞行器的动载荷工况和动载荷进行识别。在缺乏动载荷实测数据的情况下,将模态矩阵左乘辨识得到的广义加速度复现物理空间加速度,并与遥测低频振动加速度对比,验证了辨识出的广义坐标的正确性,证明了动载荷识别结果合理,不仅能识别载荷大小,也能识别载荷沿飞行器的空间结构分布,也证明了由亥姆赫兹不稳定现象引起的内外流干扰是引起飞行器动载荷的主要原因。
Based on the least squares method for solving statically indeterminate equation set, the telemetry low frequency vibration parameters are analyzed and the modal ＇s generalized coordinates are obtained. Using modal superposition method,the central air-breathing hypersonic flight vehicle＇s dynamic loadcase and dynamic load are recognited. In the absence of directly measured load data,multiplying the generalized coordinates by the modal matrix and the accelerations in the physical space is replicated and the comparison between the replicated accelerations and the telemetry low frequency vibration accelerations is made. The comparison proves the validity of the identifcated generalized coordinates and therefore the correctness of the dynamic load ＇recognition is proved rationality. After verification,the dynamic load recognition mothed is proved to be feasible and rational and in this way,the recognition results of the magnitude of load and the the spatial structure distribution of load along the aircraft are given. Meanwhile,the dynamic load＇forming reason is the internal and external flow interference caused by the Helmholtz phenomenon is proved.
作者
王骁峰
段毅
袁锐之
WANG Xiaofeng;DUAN Yi;YUAN Ruizhi(Science and Technology on Space Physics Laboratory, Beijing 100076, China)
出处
《兵器装备工程学报》
CAS
北大核心
2018年第6期33-35,57,共4页
Journal of Ordnance Equipment Engineering
关键词
载荷识别
模态叠加
最小二乘法
中心吸气式
超声速飞行器
load recognition
modal superposition
least squares method
central air-breathing
hypersonic flight vehicle
