柴油机增程器机电耦合作用下的扭振特性分析

doi:10.19562/j.chinasae.qcgc.2025.02.008

Abstract

Abstract:

Torsional vibration of power system is a hot and difficult problem in NVH field of extended range electric vehicles. In order to investigate the torsional vibration characteristics of the range extender under electromechanical coupling， taking a diesel engine range extender as the research object， systematic quantification of the shaft system is carried out and a torsional vibration mechanical model of the eight-degree-of-freedom shafting system is established. A non-contact measurement method is used to conduct torsional vibration tests on the range extender platform to verify the accuracy of the model. The method of obtaining shafting structure parameters， electromagnetic parameters and excitation torque is discussed. The coupling calculation of the range-extender shafting is carried out and the comparison analysis with the original machine is made. It is concluded that the addition of the motor rotor system will reduce the natural frequency of shafting by 27.6Hz and the maximum amplitude by about 21%. The resonant speed is shifted forward by about 200 r/min on the basis of the original machine， and a natural frequency is increased in the first 12 steps. The influence of electromagnetic parameters on torsional vibration characteristics of shafting is analyzed according to the particularity of range extender working condition. The results show that the electromagnetic damping is linearly and negatively correlated with torsional vibration amplitude， but it does not change the natural frequency and resonant speed of shafting. The electromagnetic stiffness has no obvious effect on the amplitude of torsional vibration， and mainly affects the size of zero frequency， which will lead to low frequency rolling vibration of shafting.

Key words: range extender, torsional vibration, electromechanical coupling, dynamics

Jilin Lei,Xiongzhuan Yang,Weichao Wang,Yue Qiu,Zhaoqian Yang,Yuhua Bi,Rui Mo. Torsional Vibration Characteristic Analysis of Diesel Engine Range Extender Under Electromechanical Coupling[J].Automotive Engineering, 2025, 47(2): 281-291.

Figures/Tables 19

参数	数值
额定电压（AC）/ V	380
额定转矩/ （N·m）	250
额定功率/ kW	60
额定转速/ （r·min^-1）	2 400
极对数p	10
永磁体磁链 $ψ f / W b$	0.126
直轴电感（定子绕组d轴等效电感）L_d /mH	0.492
交轴电感（定子绕组q轴等效电感）L_q /mH	0.495

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参数	数值
活塞直径D/mm	80
曲柄半径R/mm	38.439
皮带轮端等效转动惯量I₁/（kg · mm²）	8.097 × 10³
4个曲拐转动惯量I₂-I₅/（kg · mm²）	7.003 × 10³
曲轴和飞轮间梯形轴转动惯量I₆/ （kg · mm²）	2.315 × 10³
飞轮转动惯量I₇/（kg · mm²）	1.816 × 10⁵
扭转减振器转动惯量I₈/（kg · mm²）	5.346 × 10³
发电机转子转动惯量I₉/（kg · mm²）	6.150 × 10⁴
各曲拐之间轴段扭转刚度K₂-K₅/（N·mm·rad^-1）	1.185 × 10⁹
皮带轮与第1曲拐间扭转刚度K₁/（N·mm·rad^-1）	5.860×10⁸
第4曲拐与飞轮端轴段扭转刚度K₆/（N·mm·rad^-1）	8.396×10⁸
电机输出端扭转刚度K₇/（N·mm·rad^-1）	1.050× 10⁹
扭转减振器扭转刚度K₈/（N·mm·rad^-1）	5.856×10⁵
发电机外阻尼系数	0.02^［13］

设备仪器	型号	主要技术参数
冷却水箱	ET4900-DJ	控制精度：±2 ℃ 最高进水温度：≤32 ℃ 温控范围：循环水温5-80 ℃
电池模拟器	BPDC1000D-EV	10%-90%负载上升/ 下降时间：<5 ms
数据采集系统	NI PXI-1050	槽数：12 频率：47-63 Hz 功率：最大960 V·A
编码器	LF-102.4BM-C24F	光栅齿数：360 电源电压：5 V 工作原理：增量式

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Torsional Vibration Characteristic Analysis of Diesel Engine Range Extender Under Electromechanical Coupling

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