Virtual vibration test rig for fatigue analysis of dozer push arms

IF 3.4 Q1 ENGINEERING, MECHANICAL 国际机械系统动力学学报(英文) Pub Date : 2024-08-31 DOI:10.1002/msd2.12125
Lei Hou, Weibin Li, Wenyan Gu, Zizheng Sun, Xiangqian Zhu, Jin-Hwan Choi
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Abstract

To obtain accurate fatigue life results for construction machinery components, acquiring load spectra is crucial, as their authenticity and validity directly determine the precision of the analysis. In working conditions, component attitudes change continuously, but they remain static on the vibration test rig (VTR), so the acquired target signals should match with the actual component attitudes in the driving signal generation. This paper proposes an efficient and economical simulation-based virtual VTR for fatigue analysis of dozers. First, the relationship between the push arm rotation angle and the cylinder stroke is established, since the cylinder strokes can be measured easily in data acquisition experiments. Second, load decomposition is used to determine the attitude relationship between virtual VTR conditions and actual conditions, and target signals are calculated based on this attitude relationship and measured data. According to the system's frequency response function, the driving signals are iterated until the system's response signals converge with the target signals. Finally, the iteratively obtained load spectra are utilized for fatigue life analysis. The results show that the virtual VTR can effectively and accurately obtain the results of fatigue analysis and has engineering application significance.

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用于推土机推臂疲劳分析的虚拟振动试验台
要获得准确的工程机械部件疲劳寿命结果,获取载荷谱至关重要,因为其真实性和有效性直接决定了分析的精度。在工作条件下,部件姿态不断变化,但在振动试验台(VTR)上却保持静态,因此获取的目标信号应与驱动信号生成时的实际部件姿态相匹配。本文提出了一种高效、经济的基于仿真的虚拟推土机疲劳分析 VTR。首先,建立了推臂旋转角度与油缸行程之间的关系,因为油缸行程可以在数据采集实验中轻松测量。其次,利用载荷分解确定虚拟 VTR 条件与实际条件之间的姿态关系,并根据该姿态关系和测量数据计算目标信号。根据系统的频率响应函数,对驱动信号进行迭代,直到系统的响应信号与目标信号趋同。最后,利用迭代得到的载荷谱进行疲劳寿命分析。结果表明,虚拟 VTR 可以有效、准确地获得疲劳分析结果,具有工程应用意义。
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