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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?

Thank you, Srong. I will contact the manufacturer.

More specificly, the MPP that I am interested in is made pf plastic material with 0.5 - 2mm thicness. The hole diameter is around 0.5-1 mm. I would like to use it for engine air intake noise control. Wondering if I can get some samples for testing porpose.

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?

Oops.. I mean Flow noise, not Mach noise.

Thanks, Greg. I am talking about air intake system, and turbocharger intake noise. Would you expand a little more why different systems have various Mach noise? Frequency dependent?

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

Got it. Thank you.

mmauldin, I have one more question: do you how to change the rotation direction of the spiral: closwise vs. counter-clockwise? I appreciate your advice?

I get the math model in UG. thank you all for your help. This is a great engineering website.

doc1995, BOPdesigner, thank you for your help. Sorry about my limited computer knowledge. I am using NX5. Looks like your model is the newer version. Could you please convert it to NX5?

Thank you,mmauldin. but, I could not import youe file in to UG. The message is: " The imported part has features that use expressions and is of different units. Use the "ug_convert_part" program."

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

Check B&K web: www.bkhome.com L.L.

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)...

Thanks a lot, Hacksaw. I am wondering if the resonator changed the standing wave setup in the duct. Do the parasitic resonances always occur in this type of application? Thanks, L.L.

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...