Small Group Exercise Adams (GMSD and DMKS)

In these small group exercises students learn to solve vibration problems using multibody simulation programs.


The tutorial is supported by funds from the tuition fees and is only offered in German language.


Content:

The application of MBS programs is a complementary teaching form of vibration technology lectures. The program visualizes dynamic system properties and behaviours, which are presented in very abstract matrix equations in lectures, in three-dimensional graphical interfaces. It also conveys how to use learned knowledge to transfer common used calculation software to real technical systems. Therefore the laboratory exercises provide an improved and more extensive preparation for tasks in work life.


Modeling

Available model-elements in the MBS program support the principle of modeling in vibration technology. Therefore the laboratory exercises can directly start with the creation of a first model of technical systems. Key physical effects that occur in technical systems are being replicated in a muti-body system.

Work techniques and procedures to create models are taught. For example, it is taught how to use parameters in models to be able to change models easily and efficiently at any time.


Kinematic und Dynamic Analysis of Technial Systems

Another important step in the multibody simulation besides the creation of models is the determination of numeric values of the model parameter. Therefore simple analysis tools for model verification are explained in the second teaching unit. The model typology is verified prior the simulation ("preprocessing"). The relationship between binding equations and degrees of freedom and the difference between the first and second Wittenbauer' problem will be developed.

Transient processes will be simulated afterwards. The results will be analysed by the tools of "postprocessing" to develop work techniques to analyze simulations.


Dynamic Properties

Dynamic properties of a system are characterized by its own behavior. MBS-programs have necessary tools to calculate eigenvalues and mode shapes. They allow statements about amplitudes and frequencies of vibrations and the decay of free vibrations. Stability statements are also possible. In addition to analysis tools, techniques to automate MBS-calculations are taught.


Forced Vibrations

Periodic excitations occur during the operation of technical systems, e.g. by unbalanced forces. In such cases, critical excitation frequencies or drive speeds need to be calculated and frequency-dependent system behaviours have to be determined.

Tools to transform simulation results from frequency-domains to time domains are introduced. Thus, influences of different amounts of vibration excitations can be determined. Fast-Fourier-Transformations can create water fall charts to analyse multiple operating modes.


Mechatronic Systems

In the last teaching unit, the limits of purely mechanical systems are exceeded. The created model of the mechanical system becomes a subsystem of a mechatronical system. A key technique here is the co-simulation, in which motor and control system are modelled in a second simulation program. Both programs and both models run in the same simulation.

The modeling of motors and control system shows that many work techniques that are taught in vibration technology can be used in electrical engineering and control engineering. Furthermore, the creation of a model-based feedforward control system achieves an improved dynamic behaviour of mechatronic systems with the holistic design.

CONTACT


Institute of Mechanism Theory, Machine Dynamics and Robotics

RWTH Aachen University

Eilfschornsteinstraße 18

52062 Aachen

Germany

 

Phone: +49 241 80 95546

Fax:      +49 241 80 92263

Mail:     

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