Finite Element Analysis And Optimization Research On Crankshaft Based On ANSYS

Crankshaft is one of the most important mechanical components of diesel engine. It also bears greatest load. The size parameters affect the dimensions and weight of the whole diesel engine. It also affects the performance and reliability to a large extent. With the development of engine technology continues to progress and to be perfect, the working condition of crankshaft will continue to be bad, too.The load on the crankshaft is complicated, the theory and practice show that, the main failure of small size diesel engine is the form of bending fatigue.Once it failures, it may cause the other parts destruct. As a result, to the multi-cylinder diesel engine crankshaft, how to obtain the size and distribution of stress and deformation accurately and how to design and improve crankshaft has very important significance.At first, this paper makes an overall structure design of an inline six cylinder engine crankshaft. And then the paper analyzes the balance of the crankshaft to determine the calculation method of the static balance and the dynamic balance. It uses the software of Pro/E to model the designed crankshaft. According to the related parameters we make a simulation to the dynamic characteristic of the crankshaft. Make a seamless connection between the Pro/E software and the ANSYS software, put the model into the ANSYS software, using the appropriate unit and material properties to do the stress analysis and constraint, and then have the static analysis and modal analysis of the crankshaft. It makes calculation of natural frequency and modal structure in modal analysis to explore the influence of vibration frequency of the crankshaft. At last the paper has a try with ANSYS software for the topological structure analysis of the crankshaft, to obtain the topology pseudo density curve, the objective function and the constraint relation of the crankshaft, and the concept design model.