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attachment:/home/controls/Desktop/pic.png = Transfer Function Measurements =
In this tutorial, we present a simple method to make a rudimentary transfer function measurement, using Frequency Domain Analysis. This method was discovered on a search for a more direct procedure, and so this tutorial should be modified if such a method is found. The strategy is to physically perturb one portion of the object with an oscillatory drive, and observe the maximum displacement of another portion as frequency is varied.


'''1) Create or upload your object. We will use a simple steel rectangular bar for this example. '''


http://nodus.ligo.caltech.edu:8080/40m/100726_110926/Screen_shot_2010-07-23_at_2.57.14_PM.png

'''2) Under the Solid Mechanics Physics option, add a face load to the surface which needs to be driven. Modify the pressure in each direction as needed. COMSOL understands this as a constant pressure right now, but as we move to FDA, COMSOL will automatically update this to an oscillatory pressure. '''

http://nodus.ligo.caltech.edu:8080/40m/100726_111005/Screen_shot_2010-07-23_at_2.57.38_PM.png

http://nodus.ligo.caltech.edu:8080/40m/100726_111030/Screen_shot_2010-07-23_at_2.57.45_PM.png

http://nodus.ligo.caltech.edu:8080/40m/100726_111056/Screen_shot_2010-07-23_at_2.58.05_PM.png

http://nodus.ligo.caltech.edu:8080/40m/100726_111114/Screen_shot_2010-07-23_at_2.58.18_PM.png

http://nodus.ligo.caltech.edu:8080/40m/100726_111128/Screen_shot_2010-07-23_at_2.59.02_PM.png

http://nodus.ligo.caltech.edu:8080/40m/100726_111144/Screen_shot_2010-07-23_at_3.00.37_PM.png

Transfer Function Measurements

In this tutorial, we present a simple method to make a rudimentary transfer function measurement, using Frequency Domain Analysis. This method was discovered on a search for a more direct procedure, and so this tutorial should be modified if such a method is found. The strategy is to physically perturb one portion of the object with an oscillatory drive, and observe the maximum displacement of another portion as frequency is varied.

1) Create or upload your object. We will use a simple steel rectangular bar for this example.

http://nodus.ligo.caltech.edu:8080/40m/100726_110926/Screen_shot_2010-07-23_at_2.57.14_PM.png

2) Under the Solid Mechanics Physics option, add a face load to the surface which needs to be driven. Modify the pressure in each direction as needed. COMSOL understands this as a constant pressure right now, but as we move to FDA, COMSOL will automatically update this to an oscillatory pressure.

http://nodus.ligo.caltech.edu:8080/40m/100726_111005/Screen_shot_2010-07-23_at_2.57.38_PM.png

http://nodus.ligo.caltech.edu:8080/40m/100726_111030/Screen_shot_2010-07-23_at_2.57.45_PM.png

http://nodus.ligo.caltech.edu:8080/40m/100726_111056/Screen_shot_2010-07-23_at_2.58.05_PM.png

http://nodus.ligo.caltech.edu:8080/40m/100726_111114/Screen_shot_2010-07-23_at_2.58.18_PM.png

http://nodus.ligo.caltech.edu:8080/40m/100726_111128/Screen_shot_2010-07-23_at_2.59.02_PM.png

http://nodus.ligo.caltech.edu:8080/40m/100726_111144/Screen_shot_2010-07-23_at_3.00.37_PM.png

How_To/COMSOL4/Transfer_Function_Measurements (last edited 2012-01-03 23:02:37 by localhost)