发动机曲轴扭振仿真分析与研究  

Simulation analysis on the engine crankshaft torsional vibration mechanism

作　　者：李静[1] 王东方[1] 缪小冬[1] 邓伟[1] LI Jing WANG Dongfang(School of Mechanical MIAO Xiaodong, DENG Wei and Power Engineering, Nanjing University of Technology, Jiangsu Nanjing, 211816, China)

机构地区：[1]南京工业大学机械与动力工程学院,江苏南京211816

出　　处：《机械设计与制造工程》2017年第5期41-45,共5页Machine Design and Manufacturing Engineering

基　　金：江苏省自然科学基金资助项目(BK20130941)

摘　　要：为提高发动机运行的平稳性以及整机性能,研究了发动机曲轴扭振问题。以EQH200-30发动机曲柄连杆机构为研究对象,首先利用ADAMS软件对无约束条件的曲轴进行6阶模态振型分析,然后分析了曲轴发生共振时4种临界转速扭转振幅,最后利用快速傅里叶变换(FFT)对额定转速下的扭转振幅进行操作。结果表明:曲轴连杆在前端轴、曲柄销与曲柄臂连接处发生了弯曲和扭转变形,随着频率的增大,扭转现象越发明显。而在曲轴发生共振时,对4种转速扭转振幅分析后发现,额定转速下最大振幅与实验数据吻合度较高,验证了仿真的可行性与准确性。对额定转速下的扭转振幅进行FFT操作,得到了相应的频域响应曲线,得出前轴端发生扭转变形主要是受到该转速下的频率及谐次频率影响的结论。It is significant to study the torsional vibration of the engine crankshaft for improving the stability of the engine and the performance of the whole machine. Taking the crank connected with the rod of EQH200 - 30 en- gine as the object, it analyzes six order modal without any constraint condition and crankshaft resonance based on ADAMS software, simulates the four critical speed torsional amplitude. It uses Fourier transform FFT under the rated speed to operate the torsional amplitude. The results show that the main form of vibration mode is bending deformation and torsion deformation, the main position occurs at the end of the crankshaft, crank pin and crank arm connection with the frequency of large, the phenomenon of torsion is more and more obvious. And it analyzes the four critical speed torsional amplitude at crankshaft resonance occurs, finds that the rated speed under the maximum amplitude is identical with experimental data, verifies the feasibility and accuracy of the simulation. The torsional amplitude of FFT operation under the rated speed obtains the corresponding frequency domain response curve, shows that the front axle end torsional deformation is mainly affected with the speed of the influence of harmonic frequency and time frequency.

关 键 词：曲柄连杆 发动机 曲轴扭振 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]