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以我国西北地区铁路运输环境真实振动数据为基础,利用不同频率、幅值与相位的谐波叠加方法生成随机振动信号。采用理论分析方法,建立谐波相位影响随机振动的功率谱密度、峭度和偏离度的数学模型,进而根据该模型,编制Matlab程序对真实非高斯振动环境的时域信号进行数字模拟。利用ANSYS软件建立车载印制电路板(PCB)的3D有限元模型,通过静力分析、模态分析验证有限元模型的正确性、合理性,同时根据结果对比,对有限元模型进行修正,保证获得较为准确的PCB有限元模型。最后,根据非高斯随机振动模拟结果和车载PCB有限元模型,分析PCB的响应,根据材料的S-N曲线、雨流计数法和Palmgren-Miner准则,通过FE-SAFE软件预测车载PCB在真实非高斯随机振动条件下的疲劳寿命。
Based on the real vibration data of the railway transportation environment in the northwest of China, a random vibration signal is generated by the harmonic superposition method with different frequencies, amplitudes and phases. A theoretical analysis method is used to establish the mathematical model of power spectral density, kurtosis and deviation of the random vibration affected by the harmonic phase. According to the model, a Matlab program is developed to simulate the real time non-Gaussian vibration signal in time domain. The finite element model of vehicle printed circuit board (PCB) is established by ANSYS software. The correctness and rationality of the finite element model are verified by static analysis and modal analysis. At the same time, the finite element model is amended and guaranteed according to the result comparison Get more accurate PCB finite element model. Finally, based on the results of non-Gaussian random vibration simulation and on-board PCB finite element model, the response of PCB is analyzed. According to the SN curve, rain flow counting method and Palmgren-Miner criterion, FE- Fatigue life under vibration conditions.