A fast prediction method of ship mechanical noise with missing some information of acceleration excitation
LIU Xi’an1,2, YANG Deqing1,2, LIU Jianhua3
1. School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
2. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
3. Marine Design and Research Institute of China, Shanghai 200011, China
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.
刘西安1,2，杨德庆1,2，刘见华3. 加速度载荷信息部分缺失下船舶机械噪声快速预报[J]. 振动与冲击, 2022, 41(12): 247-253.
LIU Xi’an1,2, YANG Deqing1,2, LIU Jianhua3. A fast prediction method of ship mechanical noise with missing some information of acceleration excitation. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(12): 247-253.
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