基于路谱的随机振动耐久试验研究

目的 将多轴耐久转化为单轴耐久分析产品耐久性，大幅度降低开发成本和周期。方法 采用时域信号转化疲劳损伤谱，进一步转化功率谱密度，通过最大冲击响应谱控制路谱频域下极大值的方法生成台架试验条件。由于文中结合排气管开发进行认证，因此加入旋转构件造成的激励振源和阶次分析方法，并且形成了发动机激励和路面激励合成的台架试验谱。结果 该排气管振动耐久试验结果合格，市场及试验场并无开裂现象。结论 实现了加速试验效果，缩短了试验周期，降低了验证成本。

Random Vibration Durability Test Based on Road Spectrum

The work aims to transform the multiaxial durability into uniaxial durability and analyze the product durability to greatly reduce the development cost and cycle. The fatigue damage spectrum was transformed by the time domain signal and then the power spectrum density was further transformed. The bench test conditions were generated by controlling the maximum value of the road spectrum in frequency domain by the maximum shock response spectrum. In view of the development and certification of exhaust pipe, the analysis method for excitation source and order caused by rotating components was added, and the bench test spectrum of engine excitation and road excitation was formed. The vibration durability test results of the exhaust pipe were qualified, and there was no crack in the market and test site. The accelerated test effect is realized, the test cycle is shortened and the verification cost is reduced.