Importing modal analysis data

Question How can I get data into the SDT ?

Answer For identification SDT is meant to be used in conjunction with a data acquisition package that estimates frequency domain transfer functions. All such packages, oriented toward modal analysis (CADA-X, IDEAS-Test, Pulse, ...) have the ability to output FRFs in the universal file format.

You can then read data directly with ufread.

   UFS=ufread('File.uff');
  iiplot; % initialize the iiplot GUI and database wrapper XF
  UFS(1).info % lets you determine what is in each data block
  % when you know what data block to display 3 for example.
  XF(1)=UFS(3);
  iiplot

  XF(1).x='frequency';  % modify data set properties
  XF(1).yn='accele';

If your data is not stored using the universal format. You should, initialize the database wrapper XF then fill in the data with your own code.

   iiplot; % initialize the iiplot GUI and database wrapper XF

  XF(1)=w; % set frequencies
  XF(1).xf; % set data (doc sdt/xf will open the manual page for xf format)

  % optionnaly you can set other information
  XF(1).dof=mdof; % sensor definitions
  XF(1).x='frequency';  % modify data set properties
  XF(1).yn='accele';

  XF(1).info % will display details

  % to properly do identification set datatype in IDopt
  IDopt.data='acc';