With the pressing need to reduce weight and cost in the automotive industry, can Micro-perforated plates be a substitute for absorptive materials especially in automotive noise control with particular application to muffler acoustics?
In general, automotive muffler mainly work with acoustic reflection chambers to reduce noise; absorption material is more applied in motorcycle exhaust systems. In automotive exahust systems, there is a configuration of pipes and volumes in a specific order, so that the noise energy is reduced by reflection-based effects. This technology is rather cheap and not sensitive in view of vibrations, temperature and corrosion. If a new MPP material could handle these influences (vibrations, temperature and corrosion) over the lifetime of an exhaust system at low production costs, it might be an interesting alternative.
On the other hand, MPP could be used for noise reduction at other places than in the exhaust system, e.g. in the engine area, intake system, or at the engine hood.
Best regards,
Mario
Thank you Prof Mario for your answers. As you said, the use of MPP as a an acoustic element in real world production mufflers is not yet reported (to the best of my knowledge) perhaps due to the limitations listed by you... It would be an interesting task to study these aspects... Please let me know if you have further information in this regards.
Kind regards,
David
Hello,
I am sorry, but we did not work on this technology yet (for automotive applications). But it is an interesting idea. Eventually, MPP could serve as secondary measure for reduction of noise - not in the exhaust system, but in form of covers at sensitive areas around the exhaust. Besides automotive manufacturer, trucks and commercial vehicle industry could be possibly interested in this technology.
Best regards,
Mario
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