关键词: 果园作业平台, 车架, 加速载荷谱, 伪损伤保留编制法, 耐久性

Abstract: Aiming at the problems of complex working conditions, multiple external forces and great influence on the life of structural parts of agricultural machinery, this paper took the orchard working platform frame as the research object, compiled the accelerated load spectrum of the frame and analyzed the durability of the frame. The finite element analysis method was used to carry out mechanical analysis of the frame and select the key load measuring points. The multibody dynamics model of the orchard operation platform was established to collect the load spectrum of the corresponding measuring points. The accelerated load spectrum of different pseudodamage retention amounts was obtained by using the pseudodamage retention editing method. The influence of pseudo damage retention on the mass of accelerated load spectrum was analyzed. The effects of different editing schemes on the accuracy and efficiency of durability analysis were compared by frame durability simulation. The comparison results show that the pseudo damage retention is not less than 90% to ensure the quality of the accelerated load spectrum. The simulation results show that the minimum life course of the frame is about 65 000 km. According to the service condition of the orchard operating platform and the users service condition survey, it is known that the orchard operating platform travels about 8 100 km every year and the service life is 8 years. The frame meets the requirements. When the pseudo damage retention is 95%, it is the best preparation scheme, the time compression of the accelerated load spectrum is 55%, the error of the frame durability simulation analysis can be controlled within 5% and the simulation efficiency can be increased by 391%. This paper provides reference for improving the editing quality of the durability load of agricultural machinery parts.

Key words: orchard operation platform, frame, acceleration load spectrum, pseudodamage retention coding method, durability