波轮式洗衣机脱水桶的结构分析与多目标优化设计

STRUCTURE ANALYSIS AND MULTI-OBJECTIVE OPTIMIZATION DESIGN OF A DEWATERING BUCKET FOR A PULSATOR WASHING MACHINE

为了抑制波轮式洗衣机脱水桶(简称内桶)洗涤振动噪声,优化内桶结构及其性能,先用Solidworks软件建立内筒参数化有限元模型,导入Ansys Workbench软件,进行有限元分析后,获得影响内桶性能的主要尺寸参数,由此确定其结构优化设计的自变量;然后,将试验设计法和响应曲面法结合起来,在提高强度和刚度的条件下,同时以质量最轻为优化目标,通过Ansys Workbench中的试验设计法确定试验点,构建内桶的响应面模型,用拟合优度来评价响应面模型对试验设计数据的拟合程度,评估优化参数,获得最优尺寸方案;最后,利用优化后的尺寸对内桶重新建模,完成有限元动态分析。分析结果表明,优化后的结构在提高强度和刚度的同时,减轻了5%内桶质量,提高了其动态性能,为实际产品的结构优化设计提供了理论依据。

In order to suppress the vibration noise of a tumble dryer（ internal barrel） in a pulsator washing machine,and to optimize the internal barrel for better performance,firstly,a parameterized finite element model of the internal barrel was established by Solidworks software and imported into ANSYS Workbench software. After analyzing it and obtaining the main parameters that effect the performance of an internal barrel,the independent variables were decided for the structure optimization design of the internal barrel. Secondly,Design of Experiments and Response Surface Methodology were combined to solve a multi-objective optimization problem,under the condition of improved strength and stiffness,solution with the lightest mass is choosen as the optimization goal. Using Central Composite Design in ANSYS Workbench software,experimental points were selected,and the response surface model of an inner barrel was built. Goodness of fit evaluated the fit of the response surface model to experiment data and assessed optimization parameters,then obtained the optimal solution.. Finally,an internal barrel model was built using the optimized size. The results of its dynamic finite element analysis show that the strength and stiffness of the optimized inner barrel are improved,at the same time,its quality is reduced by 5% and its dynamic performance is improved. It provides a theoretical basis for a structure optimization design of the actual product.