Multibody Dynamics (MBD) simulations are suited to study the dynamic behaviour of interconnected rigid and/or flexible bodies undergoing large translational or rotational displacements. The motion of those bodies is calculated based on applied loads and boundary conditions defined. MBS offer comparably short calculation times. This makes them a very efficient simulation tool and an excellent choice for parameter studies and optimisations of complex assemblies having many degrees of freedom.


Multibody models can be built up based on 3D CAD drawings of parts or assemblies. Within special MBD software, the model is getting divided into several bodies, each having a characteristic mass and centre of gravity. The bodies are interconnected using joints that allows specific movements. To describe the specific behaviour of these joints, properties like stiffness, damping, and friction can be defined. From this model, the motion of the multibody system can be simulated, analysed, and optimised by applying numerical solving algorithms.
By post-processing the results of MBD, engineers then can analyse and evaluate moving paths, velocities, accelerations, forces, and moments.


Our simulation engineers apply MBD simulations in most cases in which the kinematic behaviour or dynamic forces of complex assemblies is the main topic to assess. Due to their short calculation times, MBD enable early insights in the effect of design parameters on the overall performance of a system. This allows to make well-founded design choices in a very early state of the development process, saving costs by lowering lead times and reducing the number of extended hardware tests significantly.
Often, MBD simulations are coupled to other advanced analyses, such as an extended integrity analysis of a single component or a whole assembly, performed by means of Finite Element Analyses.
Want to learn more about the software we use? Click here.


Efficient Dummy Modelling

Since the human body can be considered as a multibody system, MBD can be effectively applied in biomechanics. Hence, MBD are highly suited to model the kinematical behaviour of humans, respective crash dummies, during impact testing. Our simulation experts couple multibody models of crash dummies with impact analyses of child car seats conducted by means of Finite Element Analyses. Compared to finite element dummies, the multi body equivalents offer significantly shorter simulation times which allow to shorten lead times and fasten up the progress of the development process.

Studying Kinematics and Dynamics

MBD is particularly suited to analyse complex systems with multiple degrees of freedom.  Examples are cars, trucks, railways, roller coasters, and household appliances. Using MBD, several aspects of those applications, such as safety, performance, and comfort, can be evaluated and optimised. We apply MBD to model both the kinematics and the dynamics of moving systems. This enables our engineers to calculate and visualise the movements and forces resulting from external excitations. With this information the dynamical behaviour of an application can be optimised effectively.

✓  Efficient modelling and behaviour knowledge of complex dynamic systems
✓  High efficiency due to short calculation times
✓  Shorter project lead times
✓  Improved product properties
✓  Fewer hardware tests

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