How can I extract Modal transformation matrices (all the eigen vectors) for a cantilever beam

- January 6, 2021 at 5:28 am
  
  Rajveer7
  Subscriber
  
  I am trying to extract Modal Transformation matrices (all eigen vectors) for a simple cantilever beam, fixed from one end & suspended at the other. Can anyone please share the code & how can I view it after extracting them. Thanks for helping in advance !
- January 6, 2021 at 5:55 pm
  
  peteroznewman
  Subscriber
  
  nAre you only interested in exporting data?nHave you already created the Deformation plots for all the modes in Mechanical to look at the shape and the frequency?n
- January 9, 2021 at 5:59 am
  
  Rajveer7
  Subscriber
  
  nYes I have created deformation plots (attached below), I am interested in extracting Modal transformation matrices as I need it in some form which can be later fed to MATLAB in some form for further calculations. So anyways, How can I extract all the required data ?.n
- September 2, 2023 at 6:33 pm
  
  Md_Salem
  Subscriber
  
  Hello,
  I tried to use the APDL command to extract the mass and stiffness matrices, then solve them linearly as an Eigen value problem in MATLAB to get the modal matrix (combination of Eigen vectors), but there was a serious problem: the corresponding Eigen values (which are supposed to be natrural frequencies) don't match totally with those given by the ANSYS modal analysis. I think this problem needs some intention. It is a really serious one.
  Regards
- September 12, 2023 at 7:03 am
  
  Emmal Walt
  Subscriber
  
  Modal transformation matrices, also known as mode shape transformation matrices or eigenvector transformation matrices, are used in structural dynamics to transform a system's coordinates from the physical space to the modal space. They are typically derived through modal analysis, which involves solving the eigenvalue problem of the system's equations of motion. You can choose trap the cat!