波轮洗衣机动力学系统结构参数优化方法研究

发布时间：2018-06-03 07:47

本文选题：波轮洗衣机 + 撞箱　；参考：《南京航空航天大学》2016年硕士论文

【摘要】：对于洗衣机来说,振动和噪声是评价其性能的重要指标。洗衣机在脱水阶段常常伴有剧烈振动,严重的振动会导致洗衣机出现走动,甚至撞箱问题。本文以某型号波轮洗衣机为研究对象,针对脱水启动阶段出现的撞箱问题进行了研究。本文分析了波轮洗衣机的结构组成,箱体和悬挂系统是组成波轮洗衣机的两大主要部件,也是波轮洗衣机的动力学系统重要的组成部分,箱体是承载洗衣机悬挂系统的框架,其动态性能直接影响洗衣机的整体性能。论文将有限元仿真和试验测试相结合,对洗衣机的箱体进行模态分析,通过箱体模态频率和洗衣机脱水频率对比,判断由于共振造成振动过大出现撞箱问题的可能性。经分析悬挂系统参数对波轮洗衣机振动水平具有重要的影响。本文尝试通过优化悬挂系统动力学参数改善出现的撞箱问题。首先应用Lagrange方程建立了悬挂系统在定质量小位移情况下的动力学方程,并通过有限元仿真和试验验证数学模型的可靠性。在此基础上进一步推导出了悬挂系统在变质量大位移情况下的动力学方程。在MATLAB环境中,应用龙格库塔方法求解出系统的响应,利用Isight的试验设计模块对数学模型进行分析,选取合适的优化参数,然后利用试验设计和多目标优化组合的策略即Opt LHD分别与NCGA和NSGA-II组合进行参数优化,选取更加有效的参数组合。通过对比优化前后的分析结果,可知优化后洗衣机在脱水阶段的振动情况得到明显的改善,有效的避免了撞箱问题的出现。本文最后对洗衣机振动抑制结构参数优化的一般流程进行了总结,为以后继续研究该类问题提供一些思路和参考。
[Abstract]:For washing machine, vibration and noise are important indexes to evaluate its performance. The washing machine is often accompanied by intense vibration during dehydration, which can cause the washing machine to move and even crash into a box. In this paper, a certain type of wave-wheel washing machine is used as the research object, and the problem of crashing box in dehydration start-up stage is studied. In this paper, the structural composition of the wavy washing machine is analyzed. The box and the suspension system are the two main components of the wavy washing machine and the important part of the dynamic system of the wavy washing machine. The box is the frame of the suspension system of the washing machine. Its dynamic performance directly affects the whole performance of washing machine. In this paper, the finite element simulation and test are combined to analyze the modal of the washing machine box. By comparing the modal frequency of the box with the dehydration frequency of the washing machine, the possibility of crashing into the box due to the vibration caused by resonance is judged. It is analyzed that the parameters of the suspension system have an important influence on the vibration level of the wave-wheel washing machine. This paper attempts to improve the collision problem by optimizing the dynamic parameters of the suspension system. Firstly, the dynamic equation of suspension system with small displacement with constant mass is established by using Lagrange equation, and the reliability of the mathematical model is verified by finite element simulation and experiment. On this basis, the dynamic equations of suspension system with variable mass and large displacement are derived. In the MATLAB environment, the Runge-Kutta method is used to solve the response of the system. The mathematical model is analyzed by using the experimental design module of Isight, and the appropriate optimization parameters are selected. Then the experimental design and the strategy of multi-objective optimization combination, Opt LHD and NCGA and NSGA-II are used to optimize the parameters, and the more effective combination of parameters is selected. By comparing the analysis results before and after optimization, it can be seen that the vibration of washing machine in dehydration stage is obviously improved after optimization, and the problem of crashing box is effectively avoided. At the end of this paper, the general process of optimization of structural parameters for vibration suppression of washing machine is summarized, which provides some ideas and references for further study of this kind of problems.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM925.33

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