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Hi, there I wanna know the way to evaluate a anechoic chamber, semi anechoic chamber and reverbration room. Please let me know the standards or manual of evaluating those rooms. Thanks in advance.

Hi!~ It's too small to measure RPM with a optical tachometer. Is there any method to get RPM of a small motor? Thanks in advance...

Hi.. Let me know the acoustic impedance of a glass wool. Thanks in advance..

Hi! I'd like to know the FEM analysis of a silencer with SYSNOISE. Anybody to know any site of it? Thanks in advance~

Hi! I'd like to measure air-flow velocity at the end of the duct(dia 200mm) with pitot tube. (25m/s) I've found a schematic diagram on a measuring points like 0968*D, 0.865*D...etc...however but... how can I get its integrals? Just multiply with sectors? Let me know any formula or web in...

Hi! I wanna test the duct noise cancelation with ANC. Anyone who knows how can I get a ANC kit or something. Thanks in advance..

Hi. I've got a problem to prevent 'fatigue fracture of a fan'. Any idea to simulate it with ANSYS? or do you know any site dealing that problem? Thanx in advance.

Hi! Beginner's simple question... How do I get a high quality image? My rough image with untidy lines doesn't get better, I use "High quality image" menu in "View>>Visualization" though. Thanks in advance~