Example 452: A clamped beam modal analysis

No description


The comfile run by this example is as follows:

#Example_452 Modal analysis of a clamped beam
                                                                     
fem                            #set FEM environment                  
fem define nodes;r;clamped_beam;example #read in the nodes to define a beam
fem define window;c            #calculate the window size
fem define bases;r;;example        #defines a bicubic Hermite basis function
fem define elements;r;;example     #defines the beam elements   
fem draw lines                 #make the line segments visible
fem define fibre;r;;example    #Default fibre angle
fem define element;r;;example fibre
fem define equation;r;;example     #Define a modal analysis using linear
#                              !  elasticity with plane stress elements.
fem define material;r;;example     #Define the material parameters for 
#                              !  steel. 
fem list material              #List the material parameters
fem define initial;r;;example      #Define boundary conditions for the 
#                              !  problem. In this case as the beam is
#                              !  fixed at both ends, there is zero
#                              !  displacement.  The slope (i.e.
#                              !  derivative) is not fixed so that the
#                              !  beam can shear.
fem draw node                  #Draw the node numbers showing the 
#                              !  fixed boundary conditions.
fem hide node                  #Hide the node numbers
fem define solve;r;;example        #Define the solution parameters. We are
#                              !  only interested in the lowest modes
#                              !  so we only need to look for some
#                              !  of the lower eigenvalues.
fem list solve                 #List the solution parameters
fem solve                      #Solves the modal analysis problem
fem list modal mode 1          #Lists the modal frequencies and shapes
#                              !  for mode 1
fem list modal value           #Lists the modal frequencies for all the
#                              !  modes
fem draw line mode 1 dotted scale 2   #lowest frequency mode
fem draw line mode 2 dotted scale 2                       
fem draw line mode 3 dotted scale 2   #higher frequency mode 

Additional testing commands:

fem list modal

Files used by this example are:

Name                     Modified     Size

example_452.com 22-Apr-2003 2.3k clamped_beam.com 20-Nov-2001 194 clamped_beam.ipbase 10-Apr-2000 1.5k clamped_beam.ipelem 10-Apr-2000 4.2k clamped_beam.ipelfb 10-Apr-2000 2.3k clamped_beam.ipequa 26-May-2003 1.7k clamped_beam.ipfibr 28-Jun-2001 7.5k clamped_beam.ipinit 22-Apr-2003 1.2k clamped_beam.ipmate 10-Apr-2000 1.4k clamped_beam.ipnode 10-Apr-2000 16k clamped_beam.ippara 12-Nov-2002 5.8k clamped_beam.ippara_old 10-Apr-2000 4.3k clamped_beam.ipsolv 27-Aug-2002 496 test_output.com 10-Apr-2000 15

Download the entire example:

Name                      Modified     Size

examples_4_45_452.tar.gz 19-Aug-2006 14k

Testing status by version:

StatusTestedReal time (s)
i686-linux
cmSuccessSun Mar 6 00:01:55 20161
cm-debugSuccessSat Mar 5 00:02:12 20161
mips-irix
cmSuccessSun Aug 19 01:31:28 20075
cm-debugSuccessWed Aug 15 01:24:39 20078
cm-debug-clear-mallocSuccessSat Aug 18 01:28:47 200712
cm-debug-clear-malloc7SuccessMon Aug 20 01:26:07 200712
cm64SuccessSun Aug 19 01:31:35 20074
cm64-debugSuccessTue Aug 21 01:24:05 20079
cm64-debug-clear-mallocSuccessThu Apr 1 10:14:11 200420
rs6000-aix
cmSuccessWed Mar 4 01:07:15 20091
cm-debugSuccessMon Mar 2 01:06:58 20091
cm64SuccessWed Mar 4 01:07:15 20091
cm64-debugSuccessTue Mar 3 01:12:11 20091
x86_64-linux
cmSuccessSun Mar 6 00:01:03 20160
cm-debugSuccessSat Mar 5 00:01:14 20160

Testing status by file:


Html last generated: Sun Mar 6 05:50:20 2016

Input last modified: Wed Jan 4 13:46:59 2006


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