An optimization method of recovering steady state value from short time oscillatory signal of force balance for impulse tunnel
WANG Feng,WU Long,WU Dongsheng,LE Jialing
Science and Technology on Scramjet Laboratory, Hypervelocity Aerodynamics Institute, China Aerodynamic Research and Development Center, Mianyang 621000, China
Abstract：An impulse tunnel can only provide a flow with very short testing period, and the outputs of force balance are oscillatory signals with large amplitude. A new method was proposed to recover the steadystate value from the oscillatory signal. The balance’s signals over the initiation period of the tunnel were omitted and only the signals over the steady testing period were adopted for analysis. This segment of the balance’s signals was regarded as free vibration responses of a multidegreeoffreedom system caused by initial displacements and velocities, and the system was originally in a nonzero steady state supported by constant loads. The free vibration response was formulated with unknown parameters, and an optimization problem was constructed by minimizing the deviation of theoretical response from the measured response. The unknown parameters including the steadystate value of the balance’s output could be estimated by solving the optimization problem. Finally the effectiveness of the proposed method was demonstrated by several application examples.
王锋，武龙，吴东升，乐嘉陵. 脉冲风洞天平短时振荡测力数据稳态值提取的优化识别方法[J]. 振动与冲击, 2018, 37(8): 153-157.
WANG Feng,WU Long,WU Dongsheng,LE Jialing. An optimization method of recovering steady state value from short time oscillatory signal of force balance for impulse tunnel. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(8): 153-157.
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