Finite Element Analysis Of 3100 Diesel Engine Block

In the parts of diesel engine, the engine block as a casting cabinet part composes the frame work of diesel engine, supports and fixes all the moving components and accessories, meanwhile makes them keep the fit location in operation. Its reliability has an important effect on the performance of the whole diesel engine. In order to improve and optimize design project and achieve satisfied design results, we must analyze and compute it by FEM(finite element method) and have a relatively accurate prediction of the performance during the process of design,.The strength analysis and optimized design technology of the engine block are the difficult problem of study in the parts of diesel engine all along. Because of its large size and complicated force conditions, we have some difficulties in the computation model's establishment. Along with the development of software and hardware, the FEM becomes an important method of assistant design of engine block.Finite element analysis is a kind of universal numerical analysis method and the most reliable and effective tool in the force condition study of complex structure currently. Modal analysis theory and dynamic FEM technology was applied to research free mode and the strength of 3100 diesel engine block in this paper. 3-D geometric model was established on the platform of Pro/E Wildfire 2.0, then the model was reasonably simplified. After that the model was manually meshed by hex element in Patran. The frequencies and mode shapes of 3100 diesel block were worked out by using Lanczos which is the most popular method to solve modal analysis in engineering. The weak area of the engine block were found by mode shape analysis and the corresponding modifications were applied. As a result the construction of the block was optimized. Then on the basis of modal analysis the stimulating force on the engine block under steady condition was calculated considering the main factors which include the cylinder pressure, inertial force and piston side pressure. The strength and distortion of the block under each cylinder Peak pressure were obtained by Nastran. The conclusions of the paper are important for the design and optimization of the engine block construction...