Dynamic Simulation And Analysis Of Crankshaft System In A New Diesel Engine

Diesel engine is the main power device. Further improvement of its design and manufacture has very important significance to the social development. Whether its main dynamic performance is good or not directly restricts the merits of its overall performance. With the rising of power per liter (rated power/cylinder volume), the parts&components of diesel engine have to gain more power with decreased volume. As a result, the mechanical and thermal load of them surges. So it’s vital to carry out dynamic analysis of the motion mechanism. This thesis makes a series of research on this issue.Noise vibration is a key indicator during the diesel research process. This academic thesis adopt the engine module of multi-body dynamic simulation software ADAMS to model the global data and conduct multi-body dynamics simulation and piston secondary motion simulation analysis with the considering of lubrication of temperature and viscosity. The side thrust force of piston, energy loss of impact, the forces at the main bearings and the gap between piston and cylinder in high-speed and heavy load condition were obtained. The research indicates that with the rising of the engine speed, the energy loss becomes more obvious; and gets the dynamic behavior of piston secondary motion, paves the way for noise analysis.Crankshaft is an important component of the diesel engine and it’s the difficult point in diesel engine design because of it’s complex force condition. The traditional design uses static analysis and design methods, which is difficult to meet the requirement of use. This paper adopts Pro/ENGINEER software, Hypermesh software, multi-body dynamic simulation software ADAMS and finite element software Ansys to study the dynamic performance of crankshaft-connecting rod-piston system of diesel and establish virtual prototype model of the crankshaft connecting rod and piston mechanism. Application of interface software MECHANISM/Pro realized the seamless connection between ADAMS and Pro/ENGINEER. The load condition of crankshaft in every position of the working cycle were analyzed considering the main influencing factors of stress distribution such an fillet. Then the relative stress load was got by the use of Ansys to find the dangerous part in working which lay the foundation for the optimization of crankshaft.The results of this research show that the use of virtual prototyping technology combined with finite element analysis tool obtained good simulation results of the dynamic analysis of crankshaft-connecting rod-piston mechanism. Meanwhile, it has an important significance for the optimization of the crankshaft-connecting rod-piston mechanism, improvement of the design and overall performance of the diesel engine. This scientific means is both economical and effective.