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Residual modes in vibrations

  1. Feb 5, 2013 #1
    what exactly are residual modes of vibrations?
    I have come across this terminology in various fem solvers like ansys and pam crash.
     
  2. jcsd
  3. Feb 5, 2013 #2

    tiny-tim

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  4. Feb 5, 2013 #3

    Bobbywhy

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    pukb,

    Residual modes of vibration are resonant vibrations caused by an interaction between the inertial and elastic properties of the materials that form the structure. They occur in the structure after a desired motion stops, and therefore called “residual” or “left over”.

    Vibration reduction is a decisive aim for light-weight manipulators especially in space applications where low energy consumption is coupled with increasing demand for higher speed and precise motion performances. The persisting residual vibration at the end of a motion limits the performance of a system in terms of operating time and accurate positioning.

    Ultra-precision manufacturing machines are designed to fabricate and measure complex parts having micrometer-level features, with nanometer-level tolerances/surface finishes. Due to stringent accuracy requirements, these machines must be properly isolated from floor vibrations. Passive isolators provide an energy neutral, reliable and cost-effective means for vibration isolation. A major problem with the soft mounting provided by passive vibration isolators is that it induces low-frequency residual vibrations of the isolated machine base, which degrades the achievable accuracy/speed of these machines.

    Here’s one textbook on the subject:
    http://books.google.com/books?id=MU...nepage&q=residual modes of vibrations&f=false

    Cheers,
    Bobbywhy
     
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