Forced vibrations

- June 19, 2021 at 6:45 pm
  
  Evgenii_K
  Subscriber
  
  Hello everyone! Again I solve the test problem, but this time for forced fluctuations. There is a single-span beam on which the engine is fixed as a load, the engine has a mass and a shaft rotation speed.
- June 19, 2021 at 7:19 pm
  
  HesamK
  Subscriber
  
  Hi. what do you exactly want? you'd like to calculate unbalance force due to rotation of the beam? or due to a harmonic force that assert on the beam as a result of engine vibration?
- June 19, 2021 at 7:29 pm
  
  Evgenii_K
  Subscriber
  
  HesamK, Hello.
  I want to test various tasks including harmonic response and vibration, starting small. In this task, I want to determine the amplitude of forced oscillations.
- June 19, 2021 at 8:47 pm
  
  HesamK
  Subscriber
  
  Hi, for this purspose you must implement harmonic response module, not modal. in modal you get mode shapes not amplitudes. to know how to perform harmonic analysis, please watch examples on YouTube, if there are any question after that, I can help you.
- June 19, 2021 at 9:35 pm
  
  Evgenii_K
  Subscriber
  
  HesamK, thanks, but your help is not needed. The question still remains open.
- June 20, 2021 at 6:30 pm
  
  Evgenii_K
  Subscriber
  
  Found the CMOMEGA command - can this command be used for angular velocity?
- June 21, 2021 at 2:48 am
  
  peteroznewman
  Subscriber
  
  You want to simulate the force generated by an eccentric mass m that rotates with an angular velocity omega. The eccentricity is e.
  Force F = e m omega^2 If there is no eccentricity, there is no force.
  If you have a Harmonic Response analysis system, you can insert a Rotating Force load and that allows you to insert the mass and the eccentricity directly.
  Then you can compute the response over a range of omega values. 400 RPM = 6.66 Hz.
  You could plot the response from 1 Hz to 60 Hz. The eccentricity is called Rotating Radius in the Details window.
- August 8, 2021 at 9:53 am
  
  Evgenii_K
  Subscriber
  
  Thanks for the answer, peteroznewman
  Rotating Force is valid only in Full Harmonic with Coriolis Effect On.
  Now I have the following problem - now I'm trying to figure it out.
- April 25, 2022 at 6:40 am
  
  tumulpurwar
  Subscriber
  
  nice info

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