基于Wiener过程的密封圈可靠性研究

Study on reliability of seal ring based on Wiener process

针对传统寿命试验方法评估液压缸可靠性出现的耗时长、费用高且无法满足实际需求等问题,基于性能退化的可靠性评估方法,通过性能退化随时间的变化规律对液压缸进行了寿命预测与可靠性评估。采用数值模拟手段判定了各个密封圈的安全性与稳定性,利用Archard磨损模型得到了密封圈的磨损体积曲线。基于考虑随机效应的Wiener过程建立的密封圈可靠性模型,得到了首达时间失效定义下的寿命分布,确立了退化模型参数与可靠度之间的关系,并建立了液压缸密封圈的可靠度数学表达式。搭建了往复式试验平台,试验结果表明,基于Wiener过程的性能退化模型能够更好地描述密封圈的性能退化过程,与传统寿命试验方法相比,对密封圈性能退化的预测更为准确和有效。

Aiming at the problems such as long time,high cost and unable to meet the actual demand in evaluating the reliability of hydraulic cylinder by traditional life test method,the reliability evaluation method based on performance degradation was used to predict the life and evaluate the reliability of hydraulic cylinder through the change law of performance degradation with time.The safety and stability of each seal ring were determined by numerical simulation method,and the wear volume curves of seal rings were obtained by Archard wear model.Based on the reliability model of seal ring established by Wiener process considering random effects,the life distribution under the definition of first arrival time failure was obtained,the relationship between degradation model parameters and reliability was established,and the mathematical expression of the reliability for seal ring of hydraulic cylinder was established.The reciprocating test platform was built.The test results show that the performance degradation model based on the Wiener process can better describe the performance degradation process of seal ring.Compared with the traditional life test method,the prediction for the performance degradation of seal ring is more accurate and effective.