A fast prediction method of ship mechanical noise with missing some information of acceleration excitation

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (12) : 247-253.

LIU Xi’an1,2, YANG Deqing1,2, LIU Jianhua3

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Abstract

To address the issue of large errors of ship mechanical noise prediction, a fast prediction method of ship mechanical noise was investigated under missing some information of acceleration excitation. By investigating the influence of exciting generalized force components on mechanical noise, it pointed out that the mechanism model of equipment is simplified to equivalent load model FzMxy which consists of Fz, Mx and My. According to the principle of energy superposition, the fast method based on equivalent load model is proposed to predict ship mechanical noise. Equipment loads characterized by average acceleration, the mechanical noise can be accurately predicted by the method if the exciting generalized forces can be determined. Otherwise, the range of mechanical noise is fast predicted. Experimental results show that the error of underwater radiated sound power is within 1dB with the complete acceleration; As the average acceleration is given, the range of sound power can be determined fast and efficiently by the equivalent load model.

Key words

mechanical noise / acceleration load / load identification / equivalent load model / hydroacoustic experiment

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LIU Xi’an1,2, YANG Deqing1,2, LIU Jianhua3. A fast prediction method of ship mechanical noise with missing some information of acceleration excitation[J]. Journal of Vibration and Shock, 2022, 41(12): 247-253

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