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  • Users: Rob45
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  1. Rob45

    T60 Reverberation Time Testing Question

    I am going to do a measurement on a larger space than I've tested before - where I've gotten by with a hand-clap - and I'm wondering if there are guidelines for the excitation sound level required? When can I use a large balloon (a friend uses a 36" dia. balloon), for example, and when would...
  2. Rob45

    TMD to Improve Isolation at Mount?

    Greetings: I have a situation where an isolated vehicle cab structure has poor dynamic stiffness in one direction, at approximately 300 Hz, and therefore has poor isolation. This results in noise at the operator's ear at 300 Hz. Since in this case redesigning the structure is not an...
  3. Rob45

    Diesel Engine Noise in Trucks: Information

    I have recently run across odd-order noise in heavy-duty trucks, and have traced it to the engine, and to the engine block specifically. What I see most often is high noise levels at engine 4.5-order, although sometimes also at 3.5 order. Oh yeah: these are in-line six-cylinder turbocharged...

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