Softening vs. hardening nonlinear energy sink: optimization-based comparison
Témavezető
Habib Giuseppe
Email
habib@mm.bme.hu
Típus
BSc MSc TDK
Nyelv
magyar angol
Bevezető:
Tuned mass dampers are a common type of passive device used to reduce unwanted oscillations. In recent years, a nonlinear version of the tuned mass damper called a nonlinear energy sink (NES) has been developed. The NES utilizes a purely nonlinear restoring force function, allowing it to resonate at virtually any frequency and effectively dampen vibrations over a wide frequency range.We recently developed a new type of NES that utilizes a softening restoring force, which has shown exceptional performance in mitigating shock oscillations in multi-degree-of-freedom systems.
The goal of this thesis is to compare the effectiveness of hardening and softening NESs through numerical optimization of their frequency response characteristics. The NESs will be tested for their ability to suppress vibrations in a multi-degree-of-freedom primary system.
Feladatok:
- Research and analyze the current state of the art of dynamic vibration absorbers, with a focus on nonlinear energy sinks- Establish a mechanical model of the system
- Develop a generic function for the NES restoring force, which can be uniquely defined using a finite number of parameters
- Define performance evaluation criteria for the NES
- Optimize the NES restoring force function using both numerical and analytical techniques to meet the defined performance objectives
- Compare the optimal NES designs and draw general conclusions about their potential performance and suitability for different applications
- Investigate the main dynamic phenomena occurring in the optimal NES designs.
Example of a multi-DoF primary system with an attached NES
