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| 基于时域波形再现技术的车架焊缝疲劳寿命研究 | |
| 引用本文： | 高大威,李智垠,尚祎晨. 基于时域波形再现技术的车架焊缝疲劳寿命研究[J]. 上海理工大学学报, 2020, 42(1): 57-62 |
| 作者姓名： | 高大威 李智垠 尚祎晨 |
| 作者单位： | 上海理工大学机械工程学院,上海 200093;上海理工大学机械工程学院,上海 200093;上海理工大学机械工程学院,上海 200093 |
| 摘 要： | 为从试车场载荷谱中提取动载荷以准确预测车架焊缝疲劳寿命,采集试验车辆关键位置在试车场道路的时域载荷;对车架柔性化处理后,利用动力学分析软件LMS Virtual Lab搭建整车刚柔耦合多体动力学模型;基于时域波形再现技术,对目标信号进行虚拟迭代,求得目标位置垂向位移驱动信号;将驱动信号输入整车刚柔耦合多体动力学模型,分解关键连接点的动态载荷谱;基于线性疲劳累积损伤理论和Volvo法,结合目标连接点的动态载荷谱,预测目标位置焊缝的疲劳寿命;通过优化第三横梁和纵梁的连接形式使焊缝疲劳寿命提升近4倍。 |
| 关 键 词： | 车架焊缝 时域波形复现 多体动力学 Volvo法 疲劳预测 |
| 收稿时间： | 2018-09-24 |
Prediction on the fatigue life of a frame seam weld based on time waveform replication technology |
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| GAO Dawei,LI Zhiyin and SHANG Yichen. Prediction on the fatigue life of a frame seam weld based on time waveform replication technology[J]. Journal of University of Shanghai For Science and Technology, 2020, 42(1): 57-62 | |
| Authors: | GAO Dawei LI Zhiyin SHANG Yichen |
| Affiliation: | School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China,School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China and School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China |
| Abstract: | In order to preliminarily predict the fatigue life of a weld seam, the road load data of a test vehicle were collected. The chassis was dealt with as flexible and a rigid-flexible coupling model was built in the LMS Virtual Lab. Based on the technology of time waveform replication, the virtual iteration method was applied to obtain the vertical displacement driving signal on the target. The driving signal was used as the input of the rigid-flexible multi-body dynamical model of the vehicle to decompose the dynamical load spectra at connection points. Based on the theory of linear cumulative damage and the Volvo method, the fatigue life of the seam weld was predicted by virtue of the dynamical load spectrum. The weld fatigue life is increased by nearly 4 times by optimizing the connection form of the third beam and longitudinal beam. |
| Keywords: | frame weld time waveform replication multi-body dynamic Volvo method fatigue prediction |
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