Dipl.-Ing. Dr. techn. Sonja DallingerManaging Director of RED Bernard GmbH

Selected references

Dynamics und vibration damping


In the dynamics sector, we deliver expert solutions for vibration problems in construction and mechanical engineering. Besides earthquake measurements of buildings and bridges, wind-induced, human-induced, machine-induced and traffic-induced vibrations are studied.

Computer models (3D) are used to mathematically examine dynamic problems and model adjustments are made on the real object by incorporating measurement results.

Realistic computer models are used to simulate different measures and test them for effectiveness.


Vibration damping

In the vibration damping sector, we offer all engineering services, from design, production and assembly, right up to maintenance of vibration damping measures.

Besides conventional mass-spring damper absorbers, innovative liquid column dampers in passive and adaptive versions are used. In this area, we have two patents for passive and adaptive liquid column dampers.

In addition to the vibration dampers, we also design mass-spring systems to reduce vibrations transferred in the sub-soil. Using vibration-damping measures, the maximum vibration amplitudes can be reduced by up to 90% for resonance.

Further information

Tuned liquid column dampers for wind turbines

An undamped wind turbine tower has a natural frequency of approx. 0.2 Hertz and a natural damping of the structure of approx. 1% This low natural damping leads to
high vibration amplitudes amplified by wave loads in offshore wind turbines. With a tuned liquid column damper (TLCD) in the tower shaft, the effective damping of the structure can be increased to 3%; this leads to a significant reduction in the amplitudes.

In a two-year research project, we developed an innovative, tuned liquid column damper (TLCD) tailored for offshore wind turbines.

 In this area, we offer the following services:

  • Feasibility studies to investigate the effectiveness of a liquid column damper (the feasibility study incorporates the hydrodynamic investigation and determination of the natural frequency and damping)
  • Detailed design of the liquid column damper
  • Development of a prototype
  • Testing the prototype on 1:10 or 1:1 models