Analytic Computation Method of the Equivalent Thickness of Superposition Multi-Throttle-Slices of Twin-Tubes Shock Absorber

By elastic mechanics, the deformation of single throttle-slice for shock absorber was analyzed, the formula of its deformation was established. According to the relation of the deformation of multi-throttle-slices with the pressure on each slice, the analytic formula of equivalent thickness of multi-throttle-slices was established. Followed is a practical example for the computation of the equivalent thickness of multi-throttle-slices, compared the computed results with that simulated by ANSYS. The results show that the computation method of equivalent thickness of multi-throttle-slices is accurate enough.

Modeling and simulation of twin-tube hydraulic shock absorber thermodynamic characteristics and sensitivity analysis of its influencing factors

In order to find out the sensitivity of the thermophysical and structural parameters to the thermodynamic characteristics of twin-tube hydraulic shock absorbers,based on the bench test,a method for calculating the time-varying rate of the external work on the shock absorber oil is proposed.And then,a thermodynamic model of the twin-tube hydraulic shock absorber is established by using the basic thermodynamic principles.By analyzing the influence of each parameter on the thermodynamic characteristics of the shock absorber,it can be seen that,the radius of the working cylinder outer wall has the greatest influence on the temperature rise of the shock absorber,followed by the thermal conductivity of the oil,the height of the oil,the heat transfer length of the cylinder barrel,the radius of the oil storage cylinder outer wall,the emissivity of the oil storage cylinder outer wall,the height of the nitrogen,the thermal conductivity of the nitrogen,the specific heat capacity of the oil,the density of the oil,the thermal conductivity of the cylinder,and the mass of the working oil.The kinematic viscosity of the oil has the least influence on the temperature rise of the shock absorber.The research can provide an effective theoretical guidance and reference for the design of the twin-tube hydraulic shock absorber.

双桶洗衣机连体桶模具偏心问题研究

分析了双桶洗衣机连体桶模具在注射成型过程中存在的偏心问题,得出了影响其偏心的主要原因来自动模与定模斜楔配合面、热流道和浇口温度以及脱水侧型芯导向头。通过对这些因素的控制,使双桶洗衣机连体桶模具偏心问题得到了解决,投入批量生产后比较稳定。

双桶洗衣机脱水桶动力学特性研究

将双桶洗衣机脱水桶的运动模型简化为平面二自由度模型,利用达郎贝尔原理建立了双桶洗衣机脱水桶的运动方程,并对所建立方程进行求解,绘制了两个自由度的幅频特性曲线和桶部件顶端的合位移曲线,研究了脱水桶附加质量的高度对脱水桶振动的影响,最后通过CAE技术,对脱水桶悬置系统进行了模态分析和频率响应分析,验证了所建立的运动方程的正确性和可行性。

洗衣机桶后盖模具设计

本文较详细对塑胶模具中的一些复杂结构提供了新颖的、实用的解决方案：行位中有垂直向上的倒扣时，可采取行位中弹针的脱模结构；行位中产品存在出上下模方向的倒扣时，可采用前模出行位针结构；大行位中还有向下的倒扣时，可采用大行拉内斜顶的结构；对于模肉内部产品在型腔内有倒扣时，可利用产品本身的碰穿面实现模肉内弯销脱模结构。