摘要:船用柴油机油底壳尺寸大、壁厚薄,导致其模态频率低、局部振动响应大。针对油底壳结构声学优化设计进行研究。首先建立了多目标优化函数,将油底壳实测振动速度作为计算激励力输入,对油底壳横截面、内部横隔板、纵隔板、角钢等进行结构优化设计。优化结果显示:在油底壳部件尺寸不变的情况下,其第一阶模态由56.6 Hz上升至122.71 Hz;振动速度响应由22.5(mm·s-1)降至10.5(mm·s-1),显著改善了油底壳的刚度和振动响应特性。 |
关键词: 油底壳 多目标优化函数 结构 振动响应 优化 |
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Research on Low Noise Design Method for Thin-Walled Oil Sump Structure of Marine Diesel Engines |
Yan Chaoqun,Wang Shaofeng,Han Xiao,Wang Zhigang,Song Yixin |
Shanghai Marine Diesel Engine Research Institute,Shanghai 201108;Wuxi Qiyao East China Vibration Isolation Technology Co., Ltd., Jiangsu Wuxi 214000 |
Abstract:The oil sumps of marine diesel engines are usually large in size and thin in wall thickness, which often causes the problem of low modal frequency and large local vibration response. To solve this problem, optimization design was carried out on an oil sump aiming at its structural acoustics. A multi-objective optimization function was established, and the measured vibration velocity of oil sump was taken as the input of calculation excitation force. The structural optimization design of cross section, inner diaphragm, longitudinal diaphragm and angle steel of the oil sump was carried out. The results show that the first mode of the oil sump is raised from 56.6 Hz to 122.71 Hz, and the vibration speed response is reduced from 22.5( mm·s-1) to 10.5 (mm·s-1) without changing the size of the oil sump, and the stiffness and vibration response characteristics of the oil pan are significantly improved. |
Key words: oil sump multi-objective optimization function structure vibration response optimization |