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NVH Consulting - Overview
  Consulting    NVH Consulting     Consulting for Vehicle Acoustics     Door Slam/ Door Opening
Door opening and closing sounds are important factors influencing the quality impression received from a vehicle and are therefore often subject to sound design. In order to improve the opening or closing sound quality,    Binaural Transfer Path Analysis and Synthesis (BTPA/BTPS) can be applied as a powerful listening-based engineering tool.
 
The procedure allows for individual auralization of door noise path contributions originating from the latch mechanism, striker impact, seal interaction and cavity boom, and thus reveals the origins of unwanted noises. Furthermore, the acoustic effect of component modifications can be predicted, and changes can be applied that improve the overall sound quality with respect to a given target.
Microphone and triaxial accelerometer at the striker. The door functionality is fully maintained.
When a door is opened or closed, the transfer behaviour of both airborne and structure-borne noise changes rapidly, for example as seals are more and more compressed.
 
Transfer behaviour for Door BTPA
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Thus a time-variant transfer path model is used that takes quickly-changing transfer functions into account. Seals and cavity noise are added in order to achieve an even more realistic synthesis.
Simulated door sound components vs. sum
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Structure-borne components vs. sum
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Sources of annoying patterns can be clearly identified!
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