基于IWO算法的轴系—基座—壳体系统声辐射优化研究

Research on acoustic radiation optimization of shafting-base-shell system based on IWO algorithm

针对轴系-基座-壳体结构复杂,对于激振力引起的结构表面声辐射尚未形成一套有效的计算和优化方法,文章尝试通过功率流有限元和声学边界元方法,对系统声优化问题进行了研究。在直线校中状态下,用相应单元模拟系统中减振器、隔振器和吸振器,建立轴系-基座-壳体系统有限元模型,利用有限元转子动力学,计算系统某特定工况下频率响应。在此基础上采用IWO算法,以各减振单元参数为设计变量,以传递路径的总功率流为目标函数进行优化,最后利用声学边界元方法对优化结果进行对比分析。结果表明,将流经路径总功率流替代场点声压为目标函数,不仅能将问题简化大大减少计算量,还能为系统减振降噪提供有效的优化计算方法,具有重要工程应用价值。

Aiming at the complexity of shafting-base-shell structure,the calculation of structure surface acoustic radiation caused by exciting force has not yet formed a set of effective methods of calculation and optimization,this paper tries to study the system acoustic optimization problem through the power flow finite element and acoustic boundary element method.Under the straight alignment,the corresponding units are used to simulate shock absorber,vibration isolator and the shafting system-base-shell finite element model is established for calculating system frequency response in a particular condition,by using finite element rotor dynamics.On the basis of it,damping unit parameters as design variables are optimized by using IWO algorithm,and total power flow passed path as the objective function.The optimization results using acoustic boundary element method were analyzed.The results show that total power flow passed path substituting for site sound pressure as the objective function,not only can simplify the problem and greatly reduce calculation amount,but also can provide effective optimization calculation method for system vibration and noise reduction,which has the important engineering application value.