The Boundary Condition’s Study and Application of Diesel Dynamics Analysis on Unsteady Working Condition

With the instruction of computational dynamics of multi-body systems theory, the system of rigid bodies and rigidflexible bodies model of the diesel are built using CAE technology. Based on the models, considering the factors of fluid-solid coupling, modal coupling and feedback control technology, the rational boundary condition of diesel’s unsteady working condition is analyzed; it contains: cylinder pressure, transient speed, constraint relation and the simulation of the main bearing. The dynamics strength is analyzed using the models on unsteady working condition. The dynamics stress distributing is gotten in different working condition. The modeling and analyzing process can apply to the optimum design of diesel structure, the study of matching of ship-engine-oar and other marine machinery. Keywords-boundary condition; computational dynamics of multi-body systems; diesel; rod