Crankshaft kinetic analysis method

Abstract

The invention relates to the field of engines, in particular to a crankshaft kinetic analysis method. The method includes the steps of A, building finite element models of an engine and crankshaft system parts, partitioning a crankshaft, and directly performing 3D entity finite element meshing on the partitioned crankshaft; B, inputting the engine structure and crankshaft system part data into the finite element models, and respectively performing rigidity calculation on crank throw; C, selecting a lubricant and explosion pressure curve to perform load calculation; D, calculating crankshaft stress and safety coefficient; E, evaluating the crankshaft according to calculation results. The crankshaft kinetic analysis method has the advantages that the method is fast, high in efficiency and high in reliability, and time is reduced greatly; fast and efficient 3D meshing of the crankshaft is achieved, analysis model building is fast, and the analysis models are fast in response; calculation time is short; the method is more accurate as compared with a one-dimensional method and faster as compared with a complete three-dimensional method.

Description

technical field [0001] The invention relates to the field of engines, in particular to a crankshaft dynamics analysis method. Background technique [0002] The crankshaft is one of the most important parts of the engine. Its size parameters not only affect the overall size and weight of the engine to a large extent, but also affect the reliability and life of the engine to a large extent. Destruction of the crankshaft may cause serious damage to other components and the engine. At the beginning of engine design and development, it is necessary to evaluate the crankshaft structure, size parameters, materials and processes as soon as possible. Therefore, fast, efficient and accurate dynamic analysis of crankshaft stress and safety factor is very important in the conceptual design stage of the engine. [0003] In the traditional crankshaft dynamics analysis, there are the following problems: [0004] 1. Use one-dimensional analysis method to simplify the crankshaft, which ca...

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Problems solved by technology

[0004] 1. Use one-dimensional analysis method to simplify the crankshaft, which cannot reflect the structural information of the crankshaft in detail;

[0005] 2. To use a complete three-dimensional analysis method, it is necessary to establish a FEM finite element model of the engine. Complex parts such as cylinder blocks, cylinder heads, crankshafts, etc. are time-consuming to divide finite element meshes and mesh assembly; the number of meshes is large, and the finite element The grid quality is also difficult to guarantee; with a huge number of grids, the finite element analysis takes a long time; the finite element calculation is difficult to converge, and the analysis is prone to failure

[0006] 3. When meshing the crankshaft, first perform 2D meshing on the crankshaft, and then generate a 3D mesh. 2D meshing is time-consuming, and the quality of the 3D mesh is problematic. Multiple adjustments to the 2D mesh are required , takes a long time

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