Über dieses Buch

Self-excited vibrations in mechanical systems can be very dangerous for machines and structures. Therefore, means and methods to avoid or suppress such vibrations are of great importance. In this monograph the rather novel idea of employing parametric excitation for Vibration suppression is investigated thoroughly. By introducing a time­periodic stiffness parameter it is possible to enhance positive damping in the system and thereby cancel self-excited vibrations.
Analytical methods are presented for an approximate stability investigalion of low­dimensional systems with periodic coefficients. For the most part a numerical method, based on slmulation, is used, to compute domains of stability for self-excited systems and decide on the effectiveness of the proposed method. Many results are presented for simple 2-degrees-of-freedom systems, but in the last chapter also a more complex rotor system is investigated.

Über den Autor

Horst Ecker received his diploma degree in 1980 and his doctoral degree in 1990 in Mechanical Engineering from Vienna University of Technology (TU Vienna). At that time he was working mainly in Vehicle Dynamics, Tire Mechanics and also on torsional vibration problems. In 1995 he was awarded a Max Kade research stipend and spent a year as a research scholar at Duke University, Durham, North Carolina. His research was focused on the nonlinear dynamics of rotors supported by magnetic bearings. In the late 90's he became interested in vibrations of parametrically excited systems and started a research project on this topic. In March 2004 he received the habilitation degree (venia docendi) and became a docent for Technical Dynamics at TU Vienna. Since October 2004 he is an Associate Professor (a.o.Univ.Prof.) at the Institute of Mechanics and Mechatronics at TU Vienna.