【摘要】 对随机载荷作用下的特种车辆进行优化改进及检修维护的前提是预测其关键部件的疲劳寿命，为预测随机载荷作用下机构关键部件的疲劳寿命，提出基于随机载荷作用下的机构疲劳寿命预测方法。提出获得疲劳寿命曲线的拉伸疲劳实验法，得到关于构件本身的S-N曲线；提出基于疲劳寿命曲线的载荷谱编制，得到关于构件实际运动的疲劳寿命载荷谱；提出基于模糊理论的概率Miner法则，得到随机载荷应力作用下疲劳寿命预测模型；以舰载机牵引车举升机构关键部件举升轴为例进行研究，与通过实际工作参数进行计算得到的真实举升轴的疲劳寿命进行评估比较，得出此预测疲劳寿命方法更接近于实际，验证了这种方法求疲劳寿命的准确性，更加满足工程要求，为特种车辆的优化改进及检修维护提供理论依据。更多还原

【Abstract】 The premise of optimizing and improving the special vehicle under random load is to predict the fatigue life of its key components. In order to predict the fatigue life of key components of the mechanism under random load,it proposes the prediction of the fatigue life of the mechanism based on random load. method.A tensile fatigue test method for obtaining the fatigue life curve is proposed to obtain the S-N curve of the component itself;a load spectrum compilation based on the fatigue life curve is proposed to obtain the fatigue life load spectrum for the actual movement of the component;a probabilistic Miner rule based on fuzzy theory is proposed,The fatigue life prediction model under random load stress is obtained.The lifting shaft of the key components of the carrier-borne tractor-lifting mechanism is taken as an example to evaluate and compare with the fatigue life of the real lifting shaft calculated from the actual working parameters.It is concluded that this method for predicting fatigue life is closer to the reality,and verifies the accuracy of this method for the fatigue life,which meets the engineering requirements more,and provides a theoretical basis for the optimization improvement and maintenance of special vehicles.更多还原