Introduction to Multibody System Simulations

Multibody system simulation (MBS), also known as multibody simulation or multibody dynamics, is used to predict and optimize the behavior of any type of mechanical system by solving the equations of motion (that is, dynamics). A mechanical system is defined as a set of distinct bodies, usually fully rigid, that are connected by joints. The equations of motion represent the position, velocity, and acceleration of the bodies as determined by the forces, mass, and moments of inertia of the bodies. Multibody mechanical systems can refer to a wide range of systems including machinery, vehicles, engines, gearboxes, wind turbines, robotics, and electro-mechanical systems.

The behavior of a multibody system can be classified as either kinematic or dynamic, as follows:

Kinematic behavior

Describes the motion of bodies in a multibody system with respect to their joints without considering applied or internal forces.

Dynamic behavior

Describes the motion of the system due to the applied forces and the inertia characteristics of the bodies; that is, their mass, moments of inertia, and position of the center of gravity.

Using computer-aided engineering technology to model multibody system simulations is essential for the analysis and design of mechanical systems.