The Finite Element Analysis of Connecting Rod of Diesel Engine

Connecting rod mechanism is an important consideration in the design of Diesel Engine. But it is difficult to describe the dynamic changes of boundary conditions of the running engine by the traditional method of simply finite element analysis. In order to obtain the vibration characteristics and vibration frequency distributions, structural characteristics of the connecting rod mechanism using modal analysis is investigated. Firstly, a physical model of connecting rod mechanism is built using CAD software. Secondly finite element analysis and simulation of the model is taken by Hyperworks and MSC. Nastran softwares. Then its flexible multi-body dynamic model is established by ADAMS/View. And the fatigue stress of connecting rod under the max combustion pressure and Inertia force condition is calculated using the durability Module. The result indicates the stress distribution and deformation instance. The stress is mainly produced on the joint of connecting rod shell and the bottom end or the top end. And the biggest stress acting on the connecting rod is just 34.0613 MPa, early smaller than its limited stress 355 MPa. The method provides the theoretical evidence for connecting rod structure improvement and optimum design.