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1.河北工业职业技术大学,石家庄 050091
2.三一重机试验检测中心,昆山215300
3.燕山大学 河北省特种运载装备重点实验室,秦皇岛 066004
刘志雷,男,1990年生,河北邯郸人,讲师;主要研究方向为底盘动力学数值仿真与耐久性能分析;E-mail:liuzhileiedu@163.com。
纸质出版日期:2025-01-15,
收稿日期:2023-03-11,
修回日期:2023-07-06,
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刘志雷, 杜建, 韩杰. 基于实测载荷谱的横向稳定杆连杆疲劳分析与优化[J]. 机械强度, 2025,47(1):134-145.
LIU ZHILEI, DU JIAN, HAN JIE. FATIGUE ANALYSIS AND OPTIMIZATION OF TRANSVERSE STAILIZER BAR LINK BASED ON MEASURED LOAD SPECTRUM. [J]. Journal of mechanical strength, 2025, 47(1): 134-145.
刘志雷, 杜建, 韩杰. 基于实测载荷谱的横向稳定杆连杆疲劳分析与优化[J]. 机械强度, 2025,47(1):134-145. DOI: 10.16579/j.issn.1001.9669.2025.01.015.
LIU ZHILEI, DU JIAN, HAN JIE. FATIGUE ANALYSIS AND OPTIMIZATION OF TRANSVERSE STAILIZER BAR LINK BASED ON MEASURED LOAD SPECTRUM. [J]. Journal of mechanical strength, 2025, 47(1): 134-145. DOI: 10.16579/j.issn.1001.9669.2025.01.015.
为解决某皮卡车横向稳定杆连杆疲劳断裂问题,以实测载荷谱为数据支撑,基于多体动力学载荷分解法进行连杆疲劳分析与结构改进。开展稳定杆连杆载荷谱采集试验,进行传感器信号之间的关联分析,验证了采集信号的有效性。通过悬架运动学与柔顺性(Kinematics Compliance,KC)试验,校验了悬架系统动力学模型传力的准确性,采用虚拟迭代法,以实测载荷谱信号为激励,验证了整车动态模型的精度。对比运用多体动力学载荷分解法、压杆失稳理论法、台架试验法3种方法分别获取连杆的临界载荷,对连杆强度进行校核,并与连杆实测载荷值进行对比,对3种方法准确性进行评价。结果表明,多体动力学载荷分解法能精准地预测连杆的临界载荷,而台架试验法结果存在一定误差,压杆失稳理论不能直接用于连杆的强度校核。结合名义应力法与多体动力学分解的载荷谱对连杆开展疲劳仿真与优化,仿真预测连杆疲劳里程数为12 143 km,与真实寿命相对误差值为14%,证明了仿真方法的有效性,对连杆杆身端口危险部位进行结构改进,消除了连杆应力集中现象,使连杆设计寿命满足使用要求。
In order to solve fatigue fracture problem of the transverse stabilizer bar link of a pickup truck
taking the measured load spectrum as support
the fatigue analysis and structural improvement of bar link was carried out based on multi-body dynamics load decomposition method. The load spectrum acquisition test of stabilizer bar link was carried out
and the correlation analysis between sensor signals was conducted
and the validity of the collected signals was verified. Through the kinematics compliance(KC) test
the accuracy of suspension dynamics model was verified
by using virtual iteration method
the accuracy of the vehicle dynamic model is verified by the measured load spectrum signal as excitation. The critical load of bar link was obtained by means of multi-body dynamics load decomposition method
compression rod instability theory method and bench test method respectively
the strength of link was checked and compared with the measured load value
and the accuracy of the three methods was evaluated. The results show that multi-body dynamics load decomposition method can accurately predict the critical load
the bench test method have some errors
and the the compression rod instability theory cannot be directly used for strength check of link. Fatigue simulation and optimization of link were carried out by combining nominal stress method and load spectrum of multi-body dynamics decomposition. The fatigue mileage predicted by simulation is 12 143 km
the relative error value with real life is 14%
which proves validity of simulation method. The structural improvement of the dangerous part of link body port eliminates stress concentration of it
and makes the design life of link meet the service requirements.
载荷谱多体动力学虚拟迭代疲劳损伤
Load spectrumMulti-body dynamicsVirtual iterationFatigue damage
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