Multibody-system simulation (MBS)

Full title:

Multibody-system simulation (MBS)

Objectives:

The model development process in the multi-body system simulation subdivide the system to be analysed into a finite number of bodies. The movement between the bodies is described by means of joints, force-elements and constraints. Depending on the research objective, the bodies can be modelled both rigidly and by modal-reduced substitute systems. This methodology allows the investigation of the dynamics of arbitrary, complex systems, whereby the fields of application can extend over the investigation of the accuracy of clocks, the driving behavior of vehicles or the dynamics of turbomachines.

In multi-body system simulation, the focus of our analyses is, among other things, on determining the time-variant loads that are characteristic of a system. These are often not known in the design of machines and systems, but are absolutely necessary for resource-saving dimensioning, e.g. of drive systems. Another core competence is the optimization of system behavior. This means both the identification of critical operating states and the development and simulative testing of damage prevention measures which can be used to extend the service life of existing machines significantly.

In order to maintain the closeness to reality when creating the multi-body simulation model, the calculation models are always analyzed with regard to the selected boundary conditions and the system boundary. Our experience shows that the system boundary has to be extended beyond mechanics in certain applications. This means in particular the realistic provision of the drive and output loads of drive systems. Interdisciplinary expert knowledge is required to describe these loads, since, for example, specialist areas from electronics and control engineering (converter-fed asynchronous machine), fluid mechanics (wind field, flow field) or terra mechanics (digging force model, driving on soft soils) have to be served. For these as well as other problems, mathematical models were developed at the Chair of Machine Elements. The functionality of the models was confirmed by measurements on real systems.

Dr.-Ing. Thomas Rosenlöcher
Dipl.-Ing. Stefanie Günther
Dipl.-Ing. Susanne Gnilke
Dipl.-Ing. Markus Spiegelhauer

• Wind turbines

• Flexible gearings

• Modelling and simulation of roller bearings

• Rotor dynamics - vibrations and unbalance excitation

• SRau-Dyn – Drive simulation crawler tracks

• Use of thruster drives in Arctic waters ArTEco (ERA-Net MARTEC)

• Mechanical watches

• Rail drive

• Hydrodynamic effects and dynamic properties of propellers and thrusters, HyDynPro (ERA-Net MARTEC)

• SRad-Dyn – Drive simulation bucket wheel excavator gearboxes

• Load determination for ladle cranes

• Integrated simulation and multi-sensor monitoring system for the dynamic design and condition diagnostics of onshore and offshore wind turbines, SIMU-WIND (INNONET)

• Simulation, observation and control minimization of dynamic loads in drive trains of wind turbines, DynLast (DFMRS, AiF)

• Dynamische Belastungen in Windenergieanlagen bei Netzunsymmetrien und Netzfehlern, DynKurz (DFMRS, AiF)

• Dynamic analysis of vertical mills for cement production