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Would you advise any commercial software to predict high frequency(1000-5000Hz)turbocharger intake and exhaust system transmission loss and/or insertion loss?

I am look for suppliers to make Micro-Perforated Panel. Any recommendations? What are manufacturing methods to produce MPP? Can MPP be made out of plastic plate?

What is the relationship between Mach Number and Air Flow Noise? What is the threshold of Mach that air flow noise is audible?

I'm having a hard time working out how to model a spiral guide in the duct like one attached below. Any advice greatly appreciated.

Can anyone help me understand 1) why the intake/exhaust manifold runners must have equal length? 2)How the half order noise is generated? 3)Why does half order content affect sound quality? Thank you Thomas

Hello, Has anyone known the air rush noise caused by Helholtz resonator? I have a resonator (500Hz) closed to inlet opening. The chassis dyno testing shows that We are getting quite an adverse affect from the 500 Hz resonator. The thing howls. We don't see it in white-noise tests (no air flow)...

I design a Helmholtz resonator to attenuate engine induction system noise. The resonator frequency is 400Hz. The resonator was connected to the duct, and insertion loss was measured. It was found that the attenuation at 400Hz was very good. However, there were noise amplifications at 280Hz and...