Simulation Calculation For Diesel Foot Support Force Based On AVL-EXCITE

One of reciprocating internal combustion engine features is nonuniformity motion. The motion of crankshaft which is main shaft of engine power output, is uniform basically, but the motion of pistion and connecting rod with large acceleration and deceleration is nonuniform, which generate thousandfold inertia load, affecting intensity and endurance of load-carrying components and resulting in vibration and noise. With high revolution speed of engine in recent years, it is important to study dynamic of engine.The foot support forces of a16V diesel engine are calculated with3D finite element and non-liner multybody dynamics method. The finite element models of crankshaft and engine block which are created in finite element software, are reduced by substructure technique. The files which are got by reducing are imported AVL-EXCITE. According to research destination, the multybody dynamics models are established in AVL-EXCITE, and diesel parameters and load data are defined. Two operating cycles of diesel engine are simulated at1OOOr/min., the results include the support forces time and frequency domain diagrams. The forces through calculating are compared with test data, the location of maximum support forces is the same as test data. The values between simulation result and test data are different, but the results are still verifying the research method and multybody dynamics models are reasonable.The research method of the paper combines finite element method and multybody dynamics. The method is in consideration of multybody interaction, overcoming the disadvantage of finite element analysis inaccurate boundary condition. The method takes advantage of accuracy of3D entity model, thus the simulation is close to actual diesel engine working condition. The simulation results are referenced in the structural design of engine block and foot support.