طراحی تست عمر تسریع‌شده برای دستگاه تست سیستم انتقال قدرت خودرو بر اساس تحلیل خستگی و داده‌های جاده

In this paper, an accelerated life test (ALT) algorithm for rig testing of vehicle power transmission is proposed based on fatigue analysis and real road load data (RLD). Since the driver and driven shafts of vehicle power transmission are subjected to different loading conditions depending on road load conditions, driving style, traffic conditions, etc., the driver and driven components of the powertrain experience variable torque levels, which lead to fatigue damage of the parts. Given that there is a correlation between the field failures and tests, if a duty cycle is derived correlating the field usage of the vehicle, rig testing can be effectively used for the ALT of these components. So, in this research, an approach is presented in which the number of ALT cycles for the gearbox input shaft is obtained based on the RLD of the test vehicle under different driving conditions and various road mixes, as well as using the S-N curve of the materials. The logged RLD includes values of engine torque, throttle position and engine speed. The designed algorithm of this study is an efficient method to determine the number of duty cycles of the shafts and rotating components of the powertrain system. The presented method has been utilized to find the ALT schedule for the new six-speed gearbox installed on the Runna vehicle. According to the results, the gearbox should be tested for 278.5 hours at an engine speed of 3000 rpm and a torque of 150 Nm.