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When modeling multibody systems, flexible and rigid bodies are connected using various types of joints, gears, cams, bearings, springs, or dampers and are subjected to large displacements and rotations. One of the advantages of using the Multibody Dynamics Module is how easy it is to mix rigid and flexible parts.
Multibody Dynamics Module can be used, for example, to calculate forces experienced at the joints of the rigid parts of the structure as well as stresses generated in the flexible components. With the material models available within the module, you can selectively assign rigid and flexible parts to your model to perform detailed structural analyses that include the effects of nonlinear materials.
A multibody dynamic system is defined as a collection of solid bodies (or links) that are connected to each other by joints. In such a multibody system, some or all of the bodies can move relative to one another, but do so while maintaining the aspect ratio.
Multibody dynamics analysis is a virtual simulation of this entire body of parts as it analyses the effects they have on each other when they are in motion. It helps in designing and developing a system that works smoothly, synchronized and unhindered.
There are two types of multibody dynamic analyses undertaken – forward dynamics and inverse dynamics. Forward dynamics involves the analysis of how individual components of the body move by the application of external forces. Inverse dynamics involves the study of forces needed to make the system move in a specific manner.
The Multibody Dynamics Module can be used for modeling the static and dynamic behavior of components that undergo combinations of translational and rotational motions with respect to one another.
The module can be used to simulate, for example, the dynamics of transmission components like gears or chains. The results from a multibody analysis can then be used for other types of analysis, such as fatigue evaluation or acoustic analysis to find noise emitted by the system.
The Multibody Dynamics Module, an add-on to the COMSOL Multiphysics® software, provides an advanced set of tools for designing and optimizing 2D and 3D multibody systems using finite element analysis (FEA). The module has the ability to simulate mixed systems of flexible and rigid bodies to find the critical components in a system, all while saving computational effort.
