Nonlinear structural dynamics
Lightweight construction, the use of sustainable, environmentally friendly and recyclable materials, and the development of energy-efficient systems are approaches for reducing both the consumption of energy and resources and the emission of substances harmful to the climate, environment and health. The widespread application of these concepts requires reliable and easy-to-use tools for various phases such as planning, development and operation. Examples are methods for designing, optimising, verifying and investigating machines and structures and monitoring and diagnosis during operation. Many existing methods are based on linear, time-invariant and classically damped theories, while corresponding systems often exhibit several nonlinear influences and localised damping effects. Therefore, this thesis investigates the applicability of structural dynamic methods for such problems and aspects related to their application.
Duration: 01.09.2023 - ongoing
Contact person: DI Thomas Thaller thomas.thaller@tugraz.at
Numerical analysis of viscoelastic rotor-bearing systems
Progressive developments in the field of rotor dynamics require special consideration of viscoelastic materials. The efficient description of rotordynamic systems plays a crucial role. Therefore, classical models can no longer satisfactorily and efficiently represent many of the viscoelastic effects in rotor dynamics.
In this dissertation, a transcendental eigenvalue search algorithm is presented, characterised by high reliability and speed. The developed model can represent all rotor dynamic effects of different viscoelastic material models. In addition to a wide variety of rotors, different unbalances are also modelled. The results show that the model is accurate and resource-efficient, which is particularly advantageous for practical applications.
Duration: 01.03.2022 - ongoing
Contact person: DI Gregor Überwimmer gregor.ueberwimmer@tugraz.at
Institute of Mechanics
Kopernikusgasse 24/IV
8010 Graz
Tel.: +43 (0) 316 873 - 7141
ifm@tugraz.at