基于拓扑优化的基座减振性能

海洋平台设备的安装基座是连接设备和平台的重要结构,开展基座减振设计是控制平台结构振动和辐射噪声的关键环节。本文提出了三种拓扑优化方案,以输出点群的加速度响应幅值均方根为目标函数,采用拓扑优化方法对基座进行优化设计。通过对三种方案进行对比分析,确定了最优拓扑设计方案。结果表明,相对于初始设计基座,优化设计后的基座其加速度振级落差由3.6dB提升到12.3dB,减振效果明显提高,且基座的总重量也略有降低,相关研究方法和设计结果对开展基座减振设计具有一定的指导和借鉴意义。

Research on Vibration Reduction Performance of Pedestal based on Topology Optimization

The pedestal of offshore platform is an important structure which connect equipment and platform. The vibration reduction design of pedestal is key to reduce structural vibration and radiated noise. In this paper, three topology optimization schemes are proposed. They are designed by using the minimum amplitude of the root mean square acceleration response of the evaluation point group as the objective function. Three schemes are compared and analyzed to determine the optimal topology scheme. The results show that the acceleration vibration level difference of the optimized pedestal is increased from 3.6dB to 12.3dB compared with the original pedestal. It proves the optimized pedestal damping effect is obviously improved and the weight of pedestal has a slight decrease. The research result has great guidance and reference for the design of pedestal vibration reduction.