【摘要】 潜艇首部声呐平台区结构复杂,激励也是随机和宽带的,其中,高频(500Hz~10kHz)自噪声预报通常采用SEA(统计能量分析)。由于缺乏实测和试验资料,各子系统间耦合因子和各结构的内损耗因子难以确定,只能近似估算。本文采用试验和SEA相结合的方法来预报其平台区自噪声。通过模型实验测出子系统在各种激励力下的动响应,进而求得子系统振动能量;采用经验公式计算各子系统模态密度,最后利用统计能量法来预报潜艇首部声呐平台区自噪声,得到了令人满意的结果。更多还原

【Abstract】 The structure of submarine sonar platform area is complicated and the driven forces are random and wide-band.Statistical energy analysis is often used to predict its middle and high-frequency(500Hz~10kHz).But coupling factors and loss factors among each subsystem and structure are difficult to confirm accurately for lack of testing data.This paper combines testing method with SEA to predict self-noise in sonar platform area.The subsystems′ dynamic response under some driven force is measured by model-testing,and then vibarancy energy is calculated.The subsystems′ mode density is calculated by empirical formulas.Finally,SEA is adopted to predict self-noise in sonar platform area and satisfying results are obtained.更多还原