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When making changes to a design or product, different measures can be taken to get the required effect. Stiffening, decoupling and damping can be used in certain situations.

Stiffening

 As an example, the influence of a stiffening rib can be seen in the sound imaging results of figure 1. This shows engineers how the behavior of their product changes. In this case by adding stiffening rib on the point of maximum deflection, a structural mode could be reduced massively.

 

Decoupling

Another very effective measure is decoupling a certain vibrating source. When vibrations cannot be transferred to another structure or surface, less acoustic energy can be build up. In figure 2 the results of two measurements can be seen a the normal toothbrush in the loader in comparison to a decoupled toothbrush.

 

Damping

 Together with stiffening and decoupling a system or object, damping can also be used to improve the noise and vibration capabilities of covers, plates and other structures.Damping is in general used to reduce more low frequent vibrations. The material or mass that can be added increases the resistance of a plate or structure and adds damping so that the structure first of all is more difficult to excited and secondly will damp out more quickly.
posted by root on Thu, 03/08/2012 - 11:30