In multibody analysis, it is initially rigid body movements that are analyzed by setting kinematic equations. This analysis is incredibly informative in relation to variation of forces and loads in interconnected systems, bearings, etc. For more detailed analyzes of single parts, structural response is also included.
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A multibody dynamic (MBD) system is one that consists of solid bodies, or links, that are connected to each other by joints that restrict their relative motion. The study of MBD is the analysis of how mechanism systems move under the influence of forces, also known as forward dynamics. A study of the inverse problem, i.e. what forces are necessary to make the mechanical system move in a specific manner is known as inverse dynamics.