The Vibration of a turbine blade under the effect of speed rotation

- June 16, 2023 at 3:02 pm
  
  mohammedlaminemekhalfia
  Subscriber
  
  Dear users.
  Hope this post will find you well.
  The problem I am trying to simulate is described as the following:
  The Blade (one of 60) in the picture is a turbine blade and it is fixed to a disk that turne from 0-6000 rpm inside an isolating chamber where the pressure is 5 mbar and the assembly is supposed to be only under the impact of centrifugal force due to rotation speed. (we are supposing that there is no effect of the aerodynamic loading and no effect of temperature change.
  My Question: I would like to plot the Vibration of a point at the of the blade per time under the effect of rotation speed. is transient is the adequate solver I shoud use? in the static modal analysis the natural frequencies were 57, 200 and 550 Hz. what should be the parameters of the transient analysis?
  Shall I only input a speed on an axis, is this enough to obtain what I am seeking for ?
  is it necessary to add a disk, in my assumption also that there is no coupling between the disk and the blade. I am also considering that the damping is 0.1 only
- June 19, 2023 at 1:48 pm
  
  Chandra Sekaran
  Ansys Employee
  
  You can do a cyclic symmetry prestressed modal analysis as shown in https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v231/en/mech_tut/ds_MStag_Comp_tut.html . OR as shown in https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v231/en/mech_tut/ds_cyclic_tutorial.html
  You can find details on cyclic symmetry analysis at static analysis at https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v231/en/ans_cycsym/ans_cycsym.html

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