Abstract:  Based on S-transform a dual threshold editing method was proposed to address the issues of poor acceleration of editing performance in S-transform editing. Firstly, this method performed an S-transform on the load spectrum to obtain the maximum amplitude spectrum. Then the method retained the corresponding load spectrum segments based on the amplitude spectrum segments which were recognized and retained by the dual threshold method to assemble the accelerated load spectrum. Finally, the statistical parameters, power spectral density, breakdown count, and fatigue simulation results of the acceleration spectra edited by the S-transform dual threshold editing method and the S-transform editing method were compared and analyzed. The results indicate that the S-transform dual threshold editing method may significantly compress the original load time, and the compression efficiency is higher than that of S-transform editing method. The fatigue damage and life analysis errors of the steering joint are smaller, which verifies the proposed method is suitable for accelerated editing research of automotive component load spectra.

Key words: S transformation, maximum amplitude spectrum, dual threshold, fatigue calculation, load spectrum acceleration editing

摘要： 针对S变换编辑法加速编辑效果不佳的问题，提出了一种基于S变换双阈值编辑方法。该方法先对载荷谱进行S变换以获取最大幅值谱，在以双阈值识别并保留的幅值谱片段为依据保留对应的载荷谱片段后，再将其拼接成加速后的载荷谱，最后对比分析S变换双阈值编辑法与S变换编辑法编辑的加速谱的统计参数、功率谱密度、穿级计数和疲劳仿真结果。研究结果表明，S变换双阈值编辑法可明显压缩原始载荷时间，且其压缩效率高于S变换编辑法，转向节的疲劳损伤和寿命分析误差更小，适用于汽车零部件载荷谱加速编辑研究。

关键词: S变换, 最大幅值谱, 双阈值, 疲劳计算, 载荷谱加速编辑