平面轨迹机构时变可靠性分析的联合概率方法

发布时间：2018-05-09 22:42

本文选题：平面轨迹机构 + 时变可靠性　；参考：《机械工程学报》2017年15期

【摘要】：机构运动时变可靠度用以度量机构在指定运动区间上的满足运动要求的概率,该类可靠度反映了机构运动的总体效应,其实质为机构系统可靠度。现有针对函数生成机构提出的运动时变可靠性分析方法不适用于轨迹机构的可靠性分析。为此,提出一种基于联合概率的轨迹机构运动时变可靠性分析方法。对于轨迹型机构,在任一坐标分量上的运动误差超过允许误差就意味着机构运动失效,因此可认为平面轨迹机构包括两种失效模式。基于此,将平面轨迹机构的系统可靠性处理为由各失效模式组成的串联系统可靠性,同时每个坐标分量也处理为N个轨迹离散点构成的串联系统,进而采用多维正态分布函数实现轨迹机构的运动可靠度求解,最后给出两个平面轨迹机构验证方法的有效性。
[Abstract]:The time-varying reliability of the mechanism is used to measure the probability that the mechanism meets the requirements of the motion in the specified motion interval. The reliability of this kind of mechanism reflects the overall effect of the mechanism motion, and its essence is the reliability of the mechanism system. The existing time-varying reliability analysis methods for the function generating mechanism are not suitable for the reliability analysis of the trajectory mechanism. In this paper, a method of time-varying reliability analysis of trajectory mechanism based on joint probability is proposed. For the locus type mechanism, the motion error in any coordinate component exceeds the allowable error, which means the motion failure of the mechanism. Therefore, it can be considered that the planar trajectory mechanism includes two failure modes. Based on this, the system reliability of planar locus mechanism is treated as series system reliability composed of each failure mode, and each coordinate component is also treated as a series system composed of N trajectory discrete points. Then the kinematic reliability of the locus mechanism is solved by using the multi-dimensional normal distribution function. Finally, the validity of the two methods for verifying the planar locus mechanism is given.
【作者单位】：西华大学机械工程学院;
【基金】：国家自然科学基金资助项目(51275425) 流体及动力机械教育部重点实验室研究基金(西华大学)(JYBFX-YQ-1) 四川省科技厅项目(2017TD0023) 四川省教育厅项目(15TD0016,12ZZ008)资助项目
【分类号】：TH112

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