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Expert Witness

Product Noise

Component Testing

Material Performance Evaluation


Component Testing

The testing of parts and components can involve two different types of measurement based studies. One method is determining how the component reacts to noise or vibration and the other is measuring the noise or vibration emitted by the component.

In testing the acoustical performance of a component, the component is subjected to airborne excitation (via loudspeakers) or structure-borne excitation (via shakers or impact hammers) and measuring a resultant noise or vibration level. The results are often expressed in noise or vibration reduction, sound transmission loss, or loss factor. Examples of this type of study include the evaluation of:

  • Automotive Body Panels
  • Dash Mats
  • Wheelhouse Treatments
  • Door Trim Acoustic Packages
  • Passthroughs and Seals
  • Carpet and Underlayment Systems
  • Interior Trim Parts
  • Loudspeaker Grilles
  • Seatbelt Retractors

Measuring the noise emitted from a part or component can help establish acoustic targets, validate production parts against a specific requirement, or aid in the optimization of noise controls. Typical components tested include:

  • Motors (e.g. power mirrors, seats, and windows)
  • Solenoids (e.g. HVAC actuators, power locks, and transmission shift locks)
  • Pumps
  • Transmission Shift Lever Assemblies
  • HVAC Blower Assemblies