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Technicon-Acoustics - Vibration Damping
Vibration damping materials dissipate excess energy and lower noise levels. This term is most commonly used in electronic, ergonomic, and industrial applications and refers to two main techniques: structural damping and vibration isolation.
- STRUCTURAL DAMPING dissipates vibrations within the structure before they become audible noise. It is most effective in applications with resonant motion. Glass and certain metals have poor damping ability. Adding structural damping materials can reduce their vibrations, controlling resonance. This is especially important in managing more than one source of vibration or when materials vibrate near natural resonance levels.
- VIBRATION ISOLATORS are small components, such as steel springs or rubber pads. They isolate vibrating parts from the materials they rattle or rub against. Isolators and shock absorbers can separate and support assemblies of practically any size or weight, from small electronic components to large vehicle suspension systems.
There are three main materials used in vibration damping: rubber, polyurethane, and PVC.
RUBBER: is a popular choice given that it absorbs energy before re-releasing it as thermal energy, making it excellent at isolating vibration energy. Rubber on its own doesn’t have damping abilities, but when combined with other materials it is highly effective.
POLYURETHANE: is a relatively new material in the field of vibration damping. Foam-like polyurethane substances can absorb a system’s excess energy. Polyurethane features cell structures and densities that can be customized to better suit specialized applications.
PVC: is effective at absorbing vibrations and resisting chemicals. While often used as sound barriers, they can also dampen vibrations in enclosures.