A very frequent problem which an engineer in the automotive field has to face, is how to attenuate the vibrations produced by systems of movement in the automobile such as powertrain, road noise, etc.
Generally, the engineer will try to diminish the vibration level generated by the radiant body from the vibratory energy that goes to the supports or to the surrounding systems.
An insulator of vibrations is used to resolve this. It is a system k,c with such properties that the resonant frequency of the system gets moved. The set of these three combined properties is known as mechanical impedance.
In the figure, the vibrating system is isolated from the base that sustains it by means of an insulator that is made up of a spring (k) and a damper (c). The frequency of resonance of the system must be well below the operating frequency of the system, so that the isolation of the vibrations is effective.