Modeling and Simulation of the Dynamics of Crankshaft-Connecting Rod-Piston-Cylinder Mechanism and a Universal Joint Using The Bond Graph Approach

摘要

This paper deals with modeling and simulation of the dynamics of two commonly used mechanisms, (1) the Crankshaft - Connecting rod - Piston - Cylinder system, and (2) the Universal Joint system, using the Bond Graph Approach. This alternative method of formulation of system dynamics, using Bond Graphs, offers a rich set of features that include, pictorial representation of the dynamics of translation and rotation for each link of the mechanism in the inertial frame, representation and handling of constraints at joints, depiction of causality, obtaining dynamic reaction forces and moments at various locations in the mechanism, algorithmic derivation of system equations in the first order state-space or cause and effect form, coding for simulation directly from the Bond Graph without deriving system equations, and so on. The links of mechanisms are modeled as rigid bodies and are suitably constrained to have certain desirable motion, or freedom, at joints. The multibond graph models have also been simulated using MATLAB code algorithmically and directly produced from them.