Probabilistic Analysis of a Robot System with Redundant Safety Units and Common-Cause Failures

This paper presents reliability and availability analyses of a model representing a system having one robot and n-redundant safety units with common-cause failures. At least k safety units must function successfully for the robot system success. The robot and other failure rates and the partially failed system repair rates are assumed constant and the failed robot-safety system repair time is assumed arbitrarily distributed. Markov and supplementary variable methods were used to perform mathematical analysis of this model. Generalized expressions for state probabilities, system availabilities, reliability, mean time to failure, and variance of time to failure are developed. Plots of some resulting expressions are shown.

Life prediction for rolling contact fatigue crack initiation of kiln wheels

这份报纸关于轴行偏转调查火炉车轮的滚动接触疲劳，它与车轮上的应用支持的负担是线性的。为有弹性的临时的便床，塑料临时的便床和 ratcheting 材料回答的疲劳裂缝开始标准被使用与轴的行偏转的二个集合估计车轮回答。有限元素模拟被使用双线性的材料模式为执行非线性、运动学在 ANSYS 11.0 变硬。由从不同 critera 比较结果，低周期的疲劳是支配的失败，这被显示出。从不同的轴的线偏转的结果显示最佳调整罐头极大地提高支持的结构的整个生活。