With passive vibration reduction, conventional methods are used to deal with vibration problems, i.e. no external power supply, which is necessary for active systems, is used. The classic passive approaches are:
- Vibration isolation
- Use of a damper
- Use of an absorber
With passive vibration isolation, usually the aim is to prevent vibrations caused by alternating forces from being transferred into the supporting (building) structure. This is done with a suitable dynamic design of the machine support (machine feet). For larger machines, a separate machine foundation is built for this purpose which must be designed in accordance with the operating conditions of the machines and technical vibration conditions. We have decades of experience in the dynamic design of machine bases and machine foundations with corresponding verification procedures for various load cases (operating loads or special loads).
Dampers are components that, when installed, reduce vibrations by converting vibrational energy into internal energy which is then dissipated. These components are most effective in the area of structural resonances, as that is where the highest vibration amplitudes are usually present. There are many damper designs and principles of operation. In case of larger dampers being required, those from our joint venture partner VICODA are used. More information regarding dampers can be found on the page about machine foundations.
A system consisting of a spring, a damper and mass can be connected to a given machine / structure as a vibration reduction absorber. The absorber is tuned to a frequency. Ideally, the absorber should be installed as close as possible to the most highly vibrating area. Examples of tuned mass dampers (TMD) can be found on the product page for vibration reduction, for example TMD.Pipe or TMD.Sound.
Absorbers are very cost-effective and reliable solutions for vibration problems because they work very effectively within their target frequency range and are characterized by a high level of robustness. A major advantage is that no abutment is required.
This means that absorbers can be mounted almost anywhere, being optimized exclusively according to the effect criteria.