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Acoustic Consideration of Passthroughs in Automobiles
Published September 26, 1994 by Automotive Technology Group, Inc. in United States
The dash panel in a car has the potential to provide significant reduction in noise from the engine compartment. In addition, dashmats are used to enhance the noise reduction. However, holes on the dash panel and dashmat are unavoidable when installing passthroughs and other accessories that are necessary for the operation of the car and the comfort of the occupant. The challenge lies in the design, engineering, and subsequent sealing of these holes such that noise transmitted through passthroughs are minimal.
This paper states the basic problem with noise due to the presence of a hole, how the performance varies with the size of the hole, and how the hole should be sealed. The paper discusses how this noise problem should be quantified and addressed. Examples are provided to substantiate the acoustical capabilities of passthroughs and to discuss various passthrough designs that are incorporated to eliminate acoustical leads and to enhance noise reduction.