基于故障树和贝叶斯网络的履带车辆行星变速机构可靠性分析

RELIABILITY ANALYSIS OF TRACKED VEHICLE PLANETARY TRANSMISSION MECHANISM BASED ON FAULT TREE AND BAYESIAN NETWORK

行星变速机构作为履带车辆传动系统的核心部件,其可靠性直接影响履带车辆的正常运行。以履带车辆行星变速机构为研究对象,基于实测试验结果建立故障树,将故障树转化为贝叶斯网络(Bayesian Network,BN)模型,并考虑行星变速机构正常、普通故障、严重故障3种状态进行可靠性分析。研究结果表明,行星变速机构失效概率为89.34×10^(-8)h^(-1),其工作400 h的可靠度为0.99964,符合设计要求;利用贝叶斯网络双向计算的功能,可知当行星变速机构发生失效,由主轴断裂或摩擦片烧蚀、翘曲、断裂或齿轮疲劳断齿引起的可能性较大。为后续装备检修、改进设计提供理论依据。

Planetary transmission mechanism is the core part of tracked vehicle transmission system,its reliability directly affects the tracked vehicle normal operation.Taking tracked vehicle planetary transmission mechanism as the research object,the fault tree was established based on the measured test results,and the fault tree was transformed into a Bayesian network(BN)model,and the reliability analysis was carried out considering the planetary transmission mechanism three states of normal,general failure and serious failure.The results show that planetary transmission mechanism failure probability is 8934×10-8 h-1,and its reliability is 099964 for 400 hours,which meets the design requirements.Using Bayesian network bidirectional calculation function,planetary transmission mechanism fault is more likely to be caused by the main shaft fracture or friction plate ablation,warping,fracture or gear fatigue broken teeth.It provides a theoretical basis for subsequent equipment maintenance and improvement design.