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通过有限元计算分别获取柴油机轴系和电动机轴系的前10阶模态频率及振型。在此基础上,通过有限元计算获取混合动力系统轴系的前10阶模态频率及振型。计算结果表明:与普通动力系统相比,由于电动机的接入,混合动力系统轴系各阶模态频率有所下降,但高于电动机轴系各阶模态频率。下降的主要原因是电动机轴系的各阶模态频率明显低于柴油机轴系。对混合动力系统轴系的振动信号进行试验测试和分析。测试结果表明:振动信号的能量集中在X方向和Y方向,表明振动信号主要由弯曲振动产生。振动信号的频谱中出现了动力系统轴系的5阶和6阶模态频率,表明振动信号主要来源于电动机转子的弯曲振动。
Through the finite element calculation, the first 10 modes frequencies and mode shapes of diesel shaft and motor shaft were obtained respectively. Based on this, the first 10 orders of modal frequencies and modes of the hybrid system were obtained by finite element method. The calculation results show that the modal frequencies of the shaft of the hybrid powertrain have decreased compared with those of the normal powertrain due to the motor access, but higher than the modal frequencies of the motor shaft. The main reason for the drop is that the modal frequencies of each shaft of the motor shaft system are obviously lower than that of the diesel engine shaft system. Test and analyze the vibration signals of the hybrid powertrain shaft system. The test results show that the energy of the vibration signal is concentrated in the X direction and the Y direction, indicating that the vibration signal is mainly generated by bending vibration. The fifth and sixth order modal frequencies of the power system shafting appear in the spectrum of the vibration signal, indicating that the vibration signal mainly comes from the bending vibration of the motor rotor.