加速度载荷信息部分缺失下船舶机械噪声快速预报  

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

作　　者：刘西安 杨德庆[1,2] 刘见华[3] LIU Xi’an;YANG Deqing;LIU Jianhua(School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Marine Design and Research Institute of China,Shanghai 200011,China)

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]上海交通大学海洋工程国家重点实验室,上海200240 [3]中国船舶与海洋工程设计研究院,上海200011

出　　处：《振动与冲击》2022年第12期247-253,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(51479115);海洋工程国家重点实验室课题(GKZD010071);高技术船舶科研计划项目(科军评[2014]148号;联装函[2016]548号)

摘　　要：为解决加速度载荷信息部分缺失时船舶机械噪声预报误差较大的问题,提出了基于设备等效载荷模型的快速预报方法。该方法基于设备载荷对机械噪声的影响规律,将设备的力学模型等效为F_(z)M_(xy)模型(设备力学模型由F_(z),M_(x)和M_(y)构成),通过能量叠加原理实现船舶机械噪声的快速预报。设备载荷以平均加速度表征时,若能确定出激振力的各个分量的载荷系数,则根据该方法可以准确地预报船舶辐射声功率;若无法确定各个激振力分量,通过等效载荷模型确定水下辐射噪声的变化范围。模型试验结果表明:设备激振载荷以完整的加速度载荷信息给出时,基于该方法的辐射声功率的计算误差在1 dB以内;若设备加速度载荷以平均加速度形式给出时,该方法可以给出水下辐射声功率的变化范围。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 F_(z)M_(xy) which consists of F_(z),M_(x) and M_(y).According to the principle of energy superposition,the fast method based on equivalent load model was proposed to predict ship mechanical noise.If 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 1 dB 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.

关 键 词：机械噪声 加速度载荷 载荷识别 等效载荷模型 水声试验 

分 类 号：U661[交通运输工程—船舶及航道工程]