Browsing by Author "Eismann, Wolfgang"

Now showing 1 - 3 of 3

Open Access
Balancing on the road
(1992) Eismann, Wolfgang; Schiehlen, Werner
Modern passenger cars are equipped with measurement technology to control the function of engine and different safety systems. In addition, the requirement for improved ride comfort is growing which means that the vibrations of the vehicle has to be minimized. One source of vibrations are unbalanced rotating parts of the vehicle due to wheels and drive shafts. To compensate such unbalances the present technology is based on measurements off the road and the dynamic behaviour of the vehicle system is not taken into account. This paper presents a method based on the parameter identification of a multibody system model of the vehicle to determine the value and angular location of compensation weights for the wheels to achieve an overalJ compensation of harmonically excited vibrations on the road. Thus, the complete dynamic vehicle system driving on its rolling wheels is taken into account.
Open Access
Dynamical measurements in vehicles by transputer technology
(1994) Eismann, Wolfgang; Schiehlen, Werner
The experimental validation of mechanical models in vehicle dynamics requires dynamical measurements while driving. Parallel processing using transputer technology allows long time measurements at high sampling rate without any loss of data as well as online computatlon resulting in a very efficient tool for vibration monitoring and parameter identification of vehicle systems. The paper presents the realization of a mobile data acquisition sytem based on transputer technology and some applications of the system to vibration monitoring and identification of a rolling unbalanced vehicle wheel. The measurements are performed with a standard passenger car of a German trademark.
Open Access
Reduction of nonholonomic systems
(1994) Schiehlen, Werner; Eismann, Wolfgang
The positional degrees of freedom of a mechanical system are by nonholonomic constraints further reduced to a smaller number of motional degrees of freedom. It is shown how the corresponding equations of motion can be reduced to a minimal number using generalized coordinates and generalized velocities. The theoretical results are applied to an actively controlled vehicle with stiff tires. One scalar control variable provides full contollability of the position of the vehicle moving on a plane surface. The control strategy is found for stationary and instationary motions.