基于瑞利法的内燃机曲轴纵向振动研究  

Investigation on Axial Vibration of Crankshaft Based on Rayleigh Differential Method

作　　者：梁兴雨[1] 舒歌群[1] 张宝欢[1] 王养军[1] 陈达亮[1] 

机构地区：[1]天津大学内燃机国家重点实验室,天津300072

出　　处：《中国机械工程》2008年第6期648-653,共6页China Mechanical Engineering

基　　金：中国博士后科学基金资助项目(20060400193);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纵向振动进行研究。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,通过拉格朗日方程建立了轴系纵振模型;根据刚度耦合原理,并考虑轴系扭转激励和弯曲强迫激励,建立了纵振强迫振动模型。采用谐次分析法对模型求解,将结果与采用三维振动测量装置实际测得的某直列四缸柴油机曲轴自由端的振动信号结果进行比较发现,计算结果与实测结果在各主要谐次都保持相当的一致。This paper presented the principle and method of calculation for the axial vibration based on Rayleigh differential method of crankshaft for a high speed diesel engine. At first, the internal combustion engine crankshaft was simplified to a continuous stepped shaft model and the kinetic formulas of shafts and masses were constructed. By means of the Lagrange formulation, the motion equation of torsional vibration and axial vibration were deduced. According to coupling principle and coupled excitation of the shafting system,a model of 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 vibration of the crankshaft at the free-end of a 4-cylinder diesel engine were measured. Compared with the practical measurement results, the calculated results are in agreement in main order.

关 键 词：内燃机 曲轴 瑞利法 纵向振动 

分 类 号：TK421.6[动力工程及工程热物理—动力机械及工程]