With respect to the problem of acquiring the service loads during the durability development of special vehicles,a high-confidence ( above 90％) minimum acquisition mileage model is proposed for the durability load spectrum with the characteristic parameter obeying the Weibull distribution. The Weibull distribution and parameter estimation of this characteristic parameter are studied based on the cumulative power spectral density which comprehensively characterizes the energy distribution and damage distribution of load spectrum. And then a high-confidence minimum acquisition mileage model of durability load spectrum is constructed. Taking the minimum mileage of load spectrum acquisition for durability development of special vehicles as an example,the minimum mileage of acquisition is calculated by taking the wheel six-axis force signal acquired under two journeys as an object. The calculation is performed by specifying the accuracy indexes and confidence requirements between the measured load spectrum samples and the sample population. The minimum acquisition mileages of the load spectrum of special vehicles can be obtained under typical working conditions and are validated with each other. The results show that the proposed model which uses the load spectrum feature parameters obeying the Weibull distribution can effectively realize the calculation of minimum mileage for load spectrum acquisition with high confidence and high accuracy.
关键词
特种车辆/耐久性载荷谱/威布尔分布/最少采集样本量/累积功率谱密度
Key words
special vehicle/durability load spectrum/Weibull distribution/minimum acquisition mileage/cumulative power spectral density
维普
万方数据