四余度伺服机构可靠性试验方法研究

由于四余度伺服机构高可靠性、短寿命设计的特点,使基于大样本长时间的指数分布可靠性试验方法难以奏效.根据四余度伺服机构纯耗损的故障机理,对其可靠性试验方法进行了研究,提出了基于威布尔过程的可靠性试验及参数统计方法.在3个基本假设的基础上,对故障率逐步提高的纯耗损型产品在寿命末期进行工作点线性化处理,认为短任务时间内威布尔过程瞬时故障率可近似等于当前工作点的指数分布故障率,把威布尔过程可靠性试验与指数分布可靠性试验有机地结合起来.试验结果表明,基于威布尔过程的可靠性试验方法可以大大缩短试验时间,节省试验费用,为高可靠性机电产品的可靠性试验提供了一种有效的途径.

Study on Reliability Testing of Four Redundancy Servo Control System

Because four redundancy servo control system is designed by limited life and high reliability, reliability testing base on exponential distribution is difficult to achieve the effect, which need large samples and long testing time. According to the failure mechanism of four redundancy servo control system, this paper studies the reliability testing method, presents a reliability testing and statistical method based on Weibull process. Based on three assumptions, this paper deals with the operational point in the end of life with the linear method. Considering the transient failure rate of Weibull process in little time as the failure rate, this paper contacts the exponential distribution reliability testing method with the Weibull process method. Application of four redundancy servo control stem indicates that the Weibull process reliability testing method can reduce the testing time and samples, and it provides an effective method to high reliability mechatronic products.