滚筒洗衣机悬挂系统优化设计

发布时间：2018-01-18 10:31

本文关键词：滚筒洗衣机悬挂系统优化设计　出处：《东南大学》2015年硕士论文　论文类型：学位论文

【摘要】：为降低滚筒洗衣机脱水过程中因洗涤衣物分布不均导致的整机振动并延长零部件的工作寿命,本课题围绕优化目标—降低滚筒洗衣机的振动幅值,基于多刚体系统动力学理论,对某型滚筒洗衣机悬挂系统进行虚拟样机建模,通过时域和频域求解分析了滚筒洗衣机在脱水阶段下的动力学特性。利用筒体x、y和z方向的振动位移测试曲线验证了模型的准确性,仿真数据与实验结果吻合良好。在对各关键零部件参数灵敏度分析的基础上,研究各设计参数对滚筒洗衣机外筒振幅的影响规律。基于ADAMS建立了滚筒洗衣机的参数化模型,对吊簧刚度、阻尼器阻尼系数、配重块质量与位置等参数进行了振动优化,一定程度上改善了系统的振动性能。在避免箱体与筒体碰撞的前提下,适当地减小吊簧刚度可以获得较好的减振、隔振效果。阻尼器阻尼系数在保证一定隔振效果的取值范围内,其值越大,筒体的瞬态振幅可以得到更好地抑制。而配重的静平衡和动平衡则直接决定了整机振动状况,通过仿真比较两种优化方案,确立了整体优化方案二,方案二在降低合振幅9.1%的同时还减轻了配重块2.1%的重量。根据滚筒洗衣机的振动传递路径,结合液体平衡环的工作原理,建立相应平衡环的数学模型,详细分析了液体体积与平衡环内容积之比、液体密度以及平衡环内外径等因素对自动纠偏特性的影响。考虑到液体平衡环应用于滚筒洗衣机上所产生的不利影响,设计出新型球式平衡环结构,并在仿真模型的基础上提出了旋转阻尼系数的概念来替代球式平衡环,而不是传统的虚拟力模型。通过设计研究的方法最终得到旋转阻尼系数的优化方案,优化后筒体x方向和z方向的振幅最大峰峰值分别降低了5.79mm、3.36mm ,仿真结果表明该方案可以较好地抑制筒体振动,并在这一基础上完成了球式平衡环结构的改进设计方案。其结果可作为滚筒洗衣机悬挂系统研发的选择与参考,从而避免盲目的经验设计。
[Abstract]:In order to reduce the vibration of the whole machine caused by the uneven distribution of washing clothes in the dehydration process of the drum washing machine and prolong the working life of the parts, this topic revolves around the optimization goal-reducing the vibration amplitude of the drum washing machine. Based on the dynamic theory of multi-rigid body system, the virtual prototype model of the suspension system of a certain type of washing machine is built, and the dynamic characteristics of the washing machine in the dehydration stage are analyzed by time domain and frequency domain. The vibration displacement test curves in y and z directions verify the accuracy of the model, and the simulation data agree well with the experimental results. Based on the sensitivity analysis of the key components parameters. The influence of design parameters on the amplitude of the outer cylinder of the drum washing machine is studied. Based on ADAMS, the parametric model of the drum washing machine is established, which can improve the stiffness of the spring and the damping coefficient of the damper. The parameters such as mass and position of weight distribution block are optimized to improve the vibration performance of the system to a certain extent. On the premise of avoiding the collision between the box body and the cylinder body, a better vibration reduction can be obtained by properly reducing the stiffness of the suspension spring. Vibration isolation effect. The damping coefficient of dampers is larger in the range of certain vibration isolation effect. The transient amplitude of the cylinder can be suppressed better, and the static balance and dynamic balance of the counterweight directly determine the vibration of the whole machine. Through the comparison of the two optimization schemes, the whole optimization scheme 2 is established. The second scheme reduces the joint amplitude 9.1% and reduces the weight of the weight distribution block 2.1%. According to the vibration transfer path of the drum washing machine, the working principle of the liquid balance ring is combined. The mathematical model of the corresponding equilibrium ring is established, and the ratio of the liquid volume to the volume in the equilibrium ring is analyzed in detail. The influence of liquid density and inner and outer diameter of the balance ring on the characteristics of automatic deviation correction. Considering the adverse effect of liquid balance ring applied to the drum washing machine, a new type of spherical balancing ring structure is designed. On the basis of the simulation model, the concept of rotational damping coefficient is put forward to replace the spherical equilibrium ring instead of the traditional virtual force model. Finally, the optimization scheme of rotational damping coefficient is obtained by the method of design and research. After optimization, the maximum peak and peak amplitude of x direction and z direction are reduced by 5.79 mm / 3.36 mm, respectively. The simulation results show that the proposed scheme can suppress the vibration of the cylinder well. On this basis, the improved design scheme of the spherical balance ring structure is completed. The results can be used as the choice and reference for the research and development of the drum washing machine suspension system, thus avoiding blind empirical design.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM925.33

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