Publish Date: 12.01.2023

Category: News from the University

Lightweight structures such as wind turbines and aircraft are exposed to high dynamic loads during operation. Due to these operating conditions and their low mass, they vibrate. This is comparable to musical instruments, which produce sounds due to induced vibrations. The vibrations of structures are characterised by the dynamic parameters and change during operation. Musical instruments change the sound they produce after they have been used. A musician detects such a change in operating conditions with his or her hearing and tunes the instrument (maintenance). In structures, which are usually complex, such monitoring is not possible; instead, the dynamic parameters are monitored. One of the dynamic parameters is structural damping, which characterises the dissipation of vibration energy in structures. If there were no damping, a guitar would never stop sounding after a string pluck. Damping in structures is caused by various sources, such as internal friction in the material, the environment in which the structure vibrates (water, air, space), joints, etc. It is very difficult to model each of these sources as they all occur simultaneously. Therefore, for simplicity, it is characterised by a single parameter called the damping ratio.

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