作者：魏峰¹, 胡溧¹, 杨啟梁¹, 李兴山², 许晶²

作者单位：1. 武汉科技大学汽车与交通工程学院，湖北 武汉 430081;
2. 东风马勒热系统有限公司，湖北 武汉 430056

关键词：疲劳试验;冷却模块;模拟试验;疲劳损伤谱;载荷谱编制

摘要：

提出一种加速疲劳试验功率谱编辑法。以某款商用车道路试验载荷谱为基础，通过分析各路况下的频域特征，结合冷却模块的计算模态结果，确认导致冷却模块失效的风险路况。基于采集的载荷信号计算得到各路况疲劳损伤谱分量，应用Miner线性叠理论获得总疲劳损伤，最终编辑生成台架加速试验用功率谱。通过对加速谱时域、幅值域和频域角度的对比，验证加速谱台架响应统计特征与原始谱的一致性。冷却模块的台架耐久试验表明，将振动量级提高1.85倍，通过57 h的台架试验模拟完成三种风险路段数百小时的道路试验。并复现道路试验的失效故障，验证其有效性。

Study on accelerated endurance test of cooling module under strengthening bad circuit condition
WEI Feng¹, HU Li¹, YANG Qiliang¹, LI Xingshan², XU Jing²
1. College of Automobile and Traffic Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;
2. Dongfeng Mahle Thermal Systems Co., Ltd., Wuhan 430056, China
Abstract: An accelerated test power spectrum editing method is proposed. Based on the road test load spectrum of a commercial vehicle, by analyzing the frequency domain characteristics of each road condition and referring to the calculated modal results of the cooling module, the risk road conditions leading to the failure of the cooling module were confirmed. The fatigue damage spectrum components of each road condition were calculated based on the collected load signals, the total fatigue damage was obtained by using Miner's linear superposition theory. Finally, the power spectrum for bench acceleration test is generated. With the acceleration spectrum compared and verified through time domain, amplitude domain and frequency domain angles, the data shows that the statistical characteristics of the accelerated spectrum are consistent with the original spectrum. The bench endurance test of cooling module shows that the enhanced vibration magnitude by 1.85 times, hundreds of hours of road tests on three risky conditions can be shortened to 57 hours of bench test, and reproduce failures in the road test, which verifies the effectiveness.
Keywords: fatigue test;cooling module;simulation test;fatigue damage spectrum;load spectrum compilation
2024, 50(3):45-51  收稿日期: 2022-01-17;收到修改稿日期: 2022-02-22
基金项目:
作者简介: 魏峰(1990-),男,辽宁抚顺市人,硕士研究生,专业方向为噪声与振动、汽车NVH及声品质。
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