Natural Frequency, Resonance, and FRFs

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  • Опубликовано: 4 дек 2024

Комментарии • 16

  • @ED-ix6mq
    @ED-ix6mq 2 года назад +3

    Very good explanation, thank you!

  • @IRANIGUY
    @IRANIGUY 4 месяца назад

    in FRF plots @4:00 : the vertical axes do not appear to be correct. The Imag axis should be Flipped in the lower phase diagram.

  • @_LusitaSimbolon
    @_LusitaSimbolon 5 месяцев назад

    thank you, very good video!

  • @Lethgar_Smith
    @Lethgar_Smith Год назад +4

    Altering the resonate frequency of an object is the key to an entirely new era of human technology.

  • @jihopark1020
    @jihopark1020 Год назад

    Thank you so much

  • @jjxie3291
    @jjxie3291 2 года назад +2

    Hello, among the three elements of frequency, damping and vibration mode obtained in modal analysis, does damping refer to "damping factor" or "damping ratio"? Is it the latter? Thank you and look forward to your reply

    • @SimcenterTesting
      @SimcenterTesting  2 года назад +1

      Damping factor and damping ratio are just different ways of describing the same thing. See this article for more info and how the different forms are related (in Section 2).
      community.sw.siemens.com/s/article/how-to-calculate-damping-from-a-frf

    • @jjxie3291
      @jjxie3291 2 года назад

      @@SimcenterTesting Thank you. I will continue to study the linked articles

  • @SoulfullSpace
    @SoulfullSpace 4 месяца назад

    I want to find the damping ratio of a helical spring using this method:
    1. Attach an accelerometer at the top of the spring.
    2. Disturb the spring by hand to generate a time vs. frequency graph.
    3. Convert this time vs. frequency graph to an FFT to see the frequency vs. amplitude graph.
    4. Find the damping ratio using the half-bandwidth method on the FFT.
    My questions are:
    a. Is this the right method to find the damping ratio, or is the FRF necessary to include the force with hammer impact?
    b. What if I use or don't use an impact hammer as in this video?

    • @Will_Rog42
      @Will_Rog42 3 месяца назад

      The half-power method is defined based on the FRF, so to use the half-power method you would need to measure the input to the spring. Alternatively, you could use the logarithmic decrement method. This does not require you to measure the force and does not require an FFT.

    • @SoulfullSpace
      @SoulfullSpace 3 месяца назад

      @@Will_Rog42 DO you think we can measure damping ratio using Log decriment without FFT and input force?

  • @giovannigiorgio0
    @giovannigiorgio0 Год назад

    At 5:04 isn't the left spring system supposed to dampen over time?

    • @SimcenterTesting
      @SimcenterTesting  Год назад

      This is a theoretical example where the left mass-spring system does not have any damping (c). As a result, it does not dampen over time.

  • @toddr5732
    @toddr5732 2 года назад

    Where is the powerpoint plug in they mentioned ? Any link to download it ?

    • @SimcenterTesting
      @SimcenterTesting  2 года назад

      community.sw.siemens.com/s/article/active-pictures-plug-ins-for-simcenter-available

  • @dawonpark3268
    @dawonpark3268 3 года назад

    well helped