基于三参数威布尔分布的自动调整臂服役可靠性研究

作为汽车制动系统关键部件的自动调整臂,其服役可靠性关系到汽车行驶的安全;通过疲劳试验分析自动调整臂零部件失效的可能性,试验结果表明:矩形压簧及螺旋压缩弹簧是影响自动调整臂失效的关键部分;利用MATLAB分析试验数据,可知自动调整臂疲劳寿命服从三参数的威布尔分布,文中结合竞争性故障模型对自动调整臂的服役可靠性进行分析,基于该模型采用最小二乘法及最大相关系数法对试验中的寿命数据进行参数估计；实例分析表明,该法的原理简单,方便实用,结合竞争性故障模型的威布尔分布能准确真实地反映自动调整臂疲劳试验数据的统计特性,具有较好的工程应用价值。

Service Reliability Research of Automatic Brake Adjuster Based on Weibull Distribution of Three Parameters

As a key component of the auto-brake system, the automatic brake adjuster is related to the safety of vehicle driving. The possibility of failure of the automatic brake adjuster is analyzed by fatigue test. The results show that the rectangular compression spring and the helical compression spring are the key factors affecting the failure of the automatic brake adjuster. By using MATLAB, it can be seen that the fatigue life of the automatic brake adjuster obeys the Weibull distribution of three parameters, combining with competitive fault model to analyze the reliability of the automatic brake adjusters. Based on the model, the least squares method and the maximum correlation coefficient method are used to analyze the reliability of the automatic brake adjuster. The life data in the experiment were used to estimate the parameters. The example shows that the method is simple, convenient and practical, and the Weibull distribution of the competitive fault model can accurately reflect the statistical properties of the data of the automatic brake adjuster fatigue test, which is of good engineering application value.