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The characteristics of automotive dampers (i.e. shock absorbers) noise are discussed in detail from both aspects of mechanical vibration and fluid flow induced noises. The measurements based upon industrial specifications of structure- and air-borne noises of automobile dampers are presented. Several noise reduction attempts were conducted on double-tube dampers at Monroe Auto Equipment Company. The results of these typical modifications and their physical implications are included in the paper.

This paper presents the key issues regarding the measurement of damper (shock absorber) noises, including the type of microphones, the locations of microphones, the mini-anechoic chamber design considerations, selection of a shaker, and the observations gathered from conducting damper noise measurements in the Monroe Auto Equipment Company. The characteristics of two typical noises, a mechanical/click noise and a swish noise, generated by the dampers are discussed in detail. In addition, the functional features of a complete digital signal processing system, including A/D (analog-to-digital) and D/A (digital-to-analog) converters for the damper's noise and vibration measurements, are discussed in the paper.