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  • Users: Vibac
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  1. Vibac

    Human excitation frequencies

    Hi all Can anyone direct me to statistical descriptions of common excitation frequencies for walking, running, dancing, etc.? I'm think of eg. mean frequency with standard deviation for each activity. Would be very useful if you have a building deck with natural frequencies known from mobility...
  2. Vibac

    Natural frequency of expansion joints

    A general question: How do you estimate the natural frequency of an expansion joint mounted on a pipeline? For a simpel SDOF approximation I can get the expansion joint's stiffness (spring rate) from the manufacturer, but how about the oscillating mass? Any better idea than summing the mass of...
  3. Vibac

    Natural frequencies from transmissibility

    Suppose a compact machine is placed on vibration isolators on the ground. You want to check the natural frequencies of the machine-isolator modes corresponding to the isolators being compressed and the machine moving up and down. The proper way to do this is probably a modal analysis from...
  4. Vibac

    Traditional vs. operational modal analysis

    Hello I wondered if any of you have had experience comparing traditional (experimental) modal analysis with operational modal analysis? To my understanding, from reading the B&K website etc. it seems that the latter output-only method provides a very versatile and practical alternative to the...

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