One of the biggest challenges for automotive Air Induction System engineers is to control noise propagated from the engine. Noise attenuation solutions must not jeopardize engine performance, must withstand harsh environments, must function within a confined area and must be produced to a strict budget.
Porous intake ducting offered by WestAkron can help meet these challenges. The acoustic function of the ducting is to:
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Eliminate or at least drastically reduce the duct's own resonances, thus making it possible to do away with some or all of the plastic resonators.
Provide a chosen attenuation balance between mouth noise and radiated noise to control passenger compartment noise.
Improve the sound quality and smoothen noise harshness.
Function within a limited space.
Engineered to perform for the life of the vehicle
The following computer plots illustrate the attenuation characteristics of the porous duct function.
PLOT A : TRANSFER ORIFICE NOISE / FILTER NOISE
PLOT B : TRANSFER RADIATED NOISE / FILTER NOISE
PLOT C : COMPOUNDED ORIFICE AND RADIATED NOISE / FILTER NOISE
ACOUSTIC BEHAVIOR PREDICTION
In order to efficiently assist the designers of combustion engine air induction systems and of all other devices meant to convey air, we can produce very accurate noise behavior predictions. Our software shows in the graphs the noise levels of expansion chambers, ducts, venturi’s, etc, the walls of which can be air tight or porous. We can also determine optimum porosity levels, etc. This device furthermore gives a visual indication of the "noise quality" the system will have.
EXAMPLE OF NOISE PREDICTION GRAPHS
(air induction on a 4 cylinder engine ):
