An optimization method of recovering steady state value from short time oscillatory&nbsp; signal of force balance for impulse tunnel

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (8) : 153-157.

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

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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 steadystate 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 multidegreeoffreedom system caused by initial displacements and velocities, and the system was originally in a nonzero 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 steadystate 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.

Key words

impulse tunnel / force balance / force measuring / parameter identification

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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[J]. Journal of Vibration and Shock, 2018, 37(8): 153-157

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