What are vibration dampers?

Vibration dampers are elastic components that absorb and reduce movements, vibrations or shocks between two components. They are used to decouple vibrations caused by motors, drives or other moving assemblies. In contrast to rigid connections, they enable controlled movement and at the same time act as energy absorbers by converting kinetic energy into heat.

 

Typical designs are

  • Rubber-metal-dampers (e.g. silent blocks or vibration isolators)
  • Pure elastomer dampers without metallic inserts
  • Spring-damper combinations for highly dynamic applications

 

The damping effect depends on parameters such as Shore hardness, geometry and installation position. The decisive factor is matching the damper to the natural frequency of the system in order to avoid resonance. Vibrations in different frequency ranges can be effectively reduced through targeted material selection and design, which ensures both component protection and damping performance.

 

Functions & applications of vibration dampers

The main function of a vibration damper is to isolate vibrations. It prevents unwanted vibrations from being transmitted from a source to sensitive structures. At the same time, it protects components from mechanical overload and minimises noise generation.

Typical areas of application:

  • Mechanical and plant engineering: Mounting of motors, pumps, compressors or machine tools to decouple vibrations from the foundation
  • Vehicle technology: reduction of engine vibrations, mounting of driver's cabs, exhaust systems and shock absorbers
  • Electronics and precision devices: Protecting sensitive components from micro-vibrations
  • Building technology: Damping of heating, ventilation and air conditioning systems
  • Medical technology and laboratory equipment: Minimising the effects of vibrations on measurement results or sensitive equipment

 

Vibration dampers perform functional tasks such as

  • Energy absorption during impacts
  • Vibration isolation over defined frequency ranges
  • Noise reduction
  • Increased operational reliability and service life of the assemblies

 

An optimally designed vibration damper prevents resonance effects, reduces maintenance costs and ensures quiet, low-wear operation.

 

Materials & components of vibration dampers

Vibration dampers usually consist of an elastic material in combination with metallic inserts or fastening elements. The choice of material depends on the load, ambient temperature, chemical resistance and the required damping characteristics.

 

Typical materials:

  • Natural rubber (NR): High elasticity, good damping effect, limited ageing resistance
  • Nitrile rubber (NBR): Oil and fuel resistant, often used in engine mounts
  • EPDMResistant to weathering, ozone and vapour and well suited for outdoor applications in infrastructure
  • Silicone rubber (VMQ/FVMQ): High temperature resistance (-60 °C to +200 °C), vibration-insulating in high temperature ranges
  • Metal-rubber composite partsCombination of steel, Aluminium or Stainless steel With rubber for secure screw connection
  • Roughly speaking, one can say that Sulphur cross-linked elastomers (especially with polysulphide bridges) have a greater hysteresis and thus higher attenuation than with over peroxide- or silane crosslinked Elastomers

 

The geometry varies depending on the installation situation - cylindrical, conical, flange-mounted or customised close contour designs are common. Materials with electrically insulating, conductive or direction-dependent properties are also used for special applications.