摘要
基于自身振动数据实时测量进行水下结构体辐射噪声快速预报,对于掌握水下目标运行状况、保持隐蔽性具有重要意义。该文针对工况传递路径分析方法评估瞬态辐射噪声问题,在圆柱壳体(舱段模型)上开展验证试验,通过稳态工况下的振动信号和实测辐射噪声,利用基于广义交叉验证的正则化方法求解振-声传递函数,以此来评估瞬态激励下的辐射噪声,并与实测的瞬态辐射噪声进行对比,同时提出针对目标被探测性影响程度的加权平均误差来衡量评估误差。试验结果显示,在瞬态辐射噪声的特征频段(辐射噪声水平明显高于背景噪声),评估结果的加权平均误差在2 dB以内。该文验证了工况传递路径分析方法评估瞬态辐射噪声的有效性,为进一步在水下复杂结构上开展研究奠定了基础。
Rapid prediction of underwater structure radiation noise using real time measurement based on own vibration data is of great significance for understanding operation status of underwater targets and maintaining concealment.Here,transient radiation noise evaluation was performed using the operational transfer path analysis method.Verification tests were conducted for a cylindrical shell,i.e.,a cabin section model.By using vibration signals under steady-state working conditions and actually measured radiation noise,the regularization method based on generalized cross validation was used to solve the vibration-sound transfer function.This function was used to evaluate radiation noise under transient excitation,the results were compared with actually measured transient radiation noise.Meanwhile,a weighted average error was proposed to measure the evaluation error based on the affecting degree of target detectability.The test results showed that within the feature frequency range of transient radiation noise where radiation noise level is obviously higher than background noise,the weighted average error of evaluation results is within 2 dB;the effectiveness of the working condition transfer path analysis method in evaluating transient radiation noise is verified to lay a foundation for further studying complex underwater structures.
作者
陈天宇
徐荣武
李瑞彪
CHEN Tianyu;XU Rongwu;LI Ruibiao(Institute of Noise and Vibration,Naval University of Engineering,Wuhan 430033,China;National Key Laboratory on Ship Vibration and Noise,Wuhan 430033,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2024年第21期231-236,共6页
Journal of Vibration and Shock
基金
国家自然科学基金(5230110454)。
关键词
辐射噪声评估
工况传递路径分析
瞬态辐射噪声
圆柱壳体
radiation noise evaluation
operational transfer path analysis
transient radiation noise
cylindrical shell
