Multi-body Dynamics And Finite Element Analysis Of Crankshaft Based On Digital Prototyping Technology

Crankshaft is one of the most important parts in engine, which bears the complicated and alternant of the impact load and is the focus and difficult in engine design. The simplified analytical methods can not meet the actual needs by traditional design, and multi-body dynamics and finite element method allows the development of more accurate analysis of the crankshaft in response to the question of dynamics possible.This paper discusses the use of digital prototyping technology, mechanical properties of the engine crankshaft are studied by means of multi-body dynamics simulation and finite element analysis. The main research work is summarized as follows:(1) Combining with the application of modern mechanical design theory, modern internal combustion engine system design and development indispensable technology - digital prototyping technology is introduced; the application of digital technology to carry out the crankshaft system dynamics on the main steps is also introduced.(2) Establishment of the crankshaft connecting rod the body model with ADAMS on the study of crankshaft intensity. Based on digital prototyping technology of the crankshaft dynamics analysis, the actual working conditions of the crankshaft is accurately simulated to gain the main axis of the crankshaft carotid and connecting rod journal forces, providing the foundation for further research and analysis of the strength of crankshaft.(3) The three-dimensional solid model of the crankshaft is established with Pro/E. Through the Pro / E and ANSYS interface to convert the ANSYS finite element model, the crankshaft meshes and boundary conditions imposed are realized. The finite element method based on the crankshaft static strength analysis of the crankshaft of the deformation and stress state calculates the fatigue strength of the crankshaft, and the results show that the strength of the crankshaft design and operating condition meet the requirements of working conditions perfectly.(4) Modal analysis were finished based on the above finite element model of crankshaft, the crankshaft before the 6-order free vibration modal analysis of vibration mode shapes and natural frequencies were calculated. By modal experiments and the combination of finite element method, the accuracy of finite element model is verified. Datum show that the finite element method and experimental modal test results agree well, indicating that finite element model of the crankshaft in a certain frequency range can better characterize their dynamic characteristics of the physical model. Modal frequency of the crankshaft can be used to predict the engine components of the possibility of dynamic interference, so the rational structural design could avoid the resonance frequency. Optimize for the engine crankshaft to improve the design based on valuable theoretical basis.With digital prototyping technology, the results combining with finite element analysis tools to complete the engine crankshaft dynamic response analysis show that a very good simulation results can be obtained. It is of great significance for improving the design of the engine crankshaft, improving the level of engine design engine performance, which is both economical and effective scientific means.