Research

Dynamics and Vibrations Group

Research

The Dynamics and Vibrations Group concentrates on the development, investigation and validation of mathematical models describing the dynamical behaviour of complex mechanical and electro-mechanical systems. This includes the active and passive control of mechanical and electro-mechanical structures.

Analytical, semi-analytical and numerical methods are employed to investigate the dynamical properties in the context of the modelling. These are perturbation analysis, Floquet theory as well as Ritz- and Galerkin procedures, for example. Complex multi-body systems, hybrid and elastic systems are simulated numerically. Control theory and Liapunov stability theory are used in the context of active control.

Topics include:

Dynamics of disk brakes

Brake squeal is a high frequency noise (1-12 kHz) of brake systems. The research of the Dynamics and Vibrations Group aims at the understanding of the excitation mechanism of brake squeal, the modelling of disk brakes with respect to squeal in general and the active and passive suppression of brake squeal. One way to achieve the latter is a structural optimization of the brake disk. Details can be found here.

Dynamics of paper machinery

Calendering is the last step in the production process of paper. Here, concerning appearance and printability, the needed surface properties are achieved. Obviously the dynamical behaviour of the paper calender has a strong influence on the final product as well as on the manufacturing efficiency. The research is about the mathematical-mechanical modeling of paper calenders taking into account the special features of the calendring process. Details can be found here.

Vibration-based energy harvesting

The main goal of vibration-based energy harvesting is to power small electronic devices using the energy from their environment, which can be found for example in structural health monitoring applications. In the Dynamics and Vibrations Group the idea of using self-excitation mechanism for energy harvesting is investigated. This approach promises to extend the applicability and the overall efficiency of energy harvesting systems. Details can be found here.

Recently studied topics

Research topics studied in the recent past include the modelling and development of piezoelectric actuators, paradoxical states of rigid body systems with friction and semiactive control by friction. Details can be found here.