SX360型自卸车车架静动态有限元分析及结构改进

【作者】 吕江涛；

【导师】 应锦春； 李德信；

【作者基本信息】 西安理工大学 ， 机械制造及其自动化， 2000， 硕士

【摘要】 SX360型自卸车是陕西汽车制造总厂设计生产的供野外作业的运输车辆，由于设计上的缺陷，该车架在恶劣工况下使用3-5个月后便出现了疲劳裂纹。本文利用大型有限元分析软件ALGOR FEAS对车架疲劳裂纹产生的原因进行了深入的研究，并提出了改进方案。 本文建立了以板单元为基本单元的车架有限元计算模型，在此模型基础上首先进行静应力分析，得到车架在各静工况下的应力分布；其次对车架做模态分析，得到车架的各阶固有频率和固有振型；最后做随机振动分析，得到车架在路面激励下的位移响应和应力响应。根据车架实际工作环境所得到的有限元计算结果，分析出车架疲劳裂纹过早产生的原因。针对于已发生疲劳裂纹和尚未发生疲劳裂纹的车架，提出了修改方案，同时针对该型车的车架提出了一种设计思路。 本文对SX360型自卸车车架的有限元分析方法和过程，适用于各类车架的设计与分析。更多还原

【Abstract】 The SX360 model dump truck is a kind of vehicle for field task designed and manufactured by Shaanxi Automobile Manufacture Assemble P1an. Because of disfigurement on design, fatigue cracks appear on the frame after working in scurviness condition within three to five months. In this paper, using the super FEM analysis software ALGOR FEAS, the reason for engendering fatigue crack of frame is studied deeply and the improved scheme is put forward.In this paper, frame FEM computation model taking plate as basic unit isestablished. Based on this model, firstly, static stress is analyzed and the stress distribution offrame under various static working condition is attained; secondly, modal analysis of frame iscarried out and natural frequency and modes of this frame is received; finally, randomvibration is analyzed and displacement and stress reaction stimulated by road surface isattained. In terms of the FEM computation results under practical working environment of frame ,the reason for frame fatigue crack appearing in the early stage is analyzed. The modification scheme to the frame that has appeared fatigue crack and hasn’t appeared is putforward. At the same time,a kind of design idea to this frame is brought forward.The frame FEM analysis method and process of SX360 dump truck in this paper is appliedto the design and analysis of all kinds of frame.更多还原