基于连续接触“有效长度模型”及Archard磨损的运动可靠性分析

以某装卸机械中的铰链四杆机构为例,提出了一种运动可靠性的计算方法。将原始杆长尺寸误差、铰链间隙误差及磨损量误差均视为随机变量,基于诸影响因素均服从正态分布的假设,对机构进行了运动可靠性分析数学模型及计算机编程计算。对"有效长度模型"理论进行改进,建立了连续接触的"有效长度模型"。根据Archard磨损理论,对机构进行运动及受力分析,建立新的运动副磨损模型。使用Matlab软件对实例进行编程计算,定量对比分析了上述因素对机构装卸手臂输出位移可靠度的影响程度。此方法不仅结果更加精确且更接近工程实际。

Analysis of the Motion Reliability Based on the Effective Length Model of Continuous Contact and the Archard's Wear Theory

Based on the hinge four-bar mechanism in small handling device,a new method of motion reliability is proposed.The original length size error,the hinge joint-gap error and wear allowance error are considered as random variables.In the assumption that the influence factors are normal distributed,the mathematical models and computer programming calculation are carried out.By improving the effective length of the model theory,a new effective length model of continuous contact is established.According to the Archard′s wear theory,a new motion pair model is created for the analysis of movement and stress.Using the Matlab software to program and calculate,the quantitative analysis of the above factors shows the influence on output displacement reliability of the handling arm.The present method is more accurate and closer to engineering practice.