基于瑞利法的内燃机曲轴扭纵耦合振动  

COUPLED TORSIONAL-AXIAL VIBRATION OF CRANKSHAFT BASED ON RAYLEIGH DIFFERENTIAL METHOD

作　　者：梁兴雨[1] 舒歌群[1] 卫海桥[1] 王养军[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072

出　　处：《机械工程学报》2006年第B05期183-187,191,共6页Journal of Mechanical Engineering

基　　金：云南省省校合作基金资助项目(2003HBBAA02A049)。

摘　　要：采用瑞利法对高速内燃机曲轴扭纵耦合振动进行了研究。将内燃机曲轴等效为连续分布阶梯轴模型,根据当量轴段以及集中质量的动能和势能关系,通过拉格朗日方程分别建立轴系扭振模型和纵振模型。根据刚度耦合原理,并考虑轴系强迫激励进而建立了扭纵耦合强迫振动模型。采用谐次分析法对模型求解后,通过与采用三维振动测量装置对某直列四缸柴油机曲轴自由端的振动信号进行实际测量所得到的结果进行比较,可以发现,扭振和纵振与实际测量的结果在各主要谐次都保持相当的一致。The principle and method of calculation for the coupled torsional-axial vibration based on Rayleigh differential method of crankshaft for a high speed diesel engine are presented. The internal combustion engine crankshaft is simplified to a continuous stepped shaft model and the kinetic formulas of shafts and masses are constructed. By means of the Lagrange formulation, the motion equation of torsional vibration and axial vibration are deduced. According to coupling principle and excited force of shafting system, a model of coupled torsional-axial forced vibration can be constructed. Using a vector matrix, a single order or a whole system vibration can be analyzed. With a newly designed testing set-up, the axial and torsional vibrations of the crankshaft at the free-end of a 4-cylinder diesel engine are measured. Compared with the practical measurement results, the calculated results are to be in agreement in main order.

关 键 词：内燃机 曲轴 瑞利法 振动 

分 类 号：TK421.6[动力工程及工程热物理—动力机械及工程]