The Dynamic Load Recognition of Central Air-Beathing Hyperosonic Flight Vehicles
WANG Xiaofeng;DUAN Yi;YUAN Ruizhi;Science and Technology on Space Physics Laboratory;
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.
【CateGory Index】： V415.4