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:

Testing status by file:

• cmiss_test.log
  

  i686-linux
  Success	cm:	cmiss_test.log.retain.
  Success	cm-debug:	cmiss_test.log.retain.
  mips-irix
  Success	cm:	cmiss_test.log.retain.
  Success	cm-debug:	cmiss_test.log.retain.
  Success	cm-debug-clear-malloc:	cmiss_test.log.retain.
  Success	cm-debug-clear-malloc7:	cmiss_test.log.retain.
  Success	cm64:	cmiss_test.log.retain.
  Success	cm64-debug:	cmiss_test.log.retain.
  Success	cm64-debug-clear-malloc:	cmiss_test.log.retain.
  rs6000-aix
  Success	cm:	cmiss_test.log.retain.
  Success	cm-debug:	cmiss_test.log.retain.
  Success	cm64:	cmiss_test.log.retain.
  Success	cm64-debug:	cmiss_test.log.retain.
  x86_64-linux
  Success	cm:	cmiss_test.log.retain.
  Success	cm-debug:	cmiss_test.log.retain.

  
  
• cmiss_test.out
  

  i686-linux
  Success	cm:	ndiff test: no significant differences with generic answer.
  Success	cm-debug:	ndiff test: no significant differences with generic answer.
  mips-irix
  Success	cm:	ndiff test: no significant differences with generic answer.
  Success	cm-debug:	ndiff test: no significant differences with generic answer.
  Success	cm-debug-clear-malloc:	ndiff test: no significant differences with generic answer.
  Success	cm-debug-clear-malloc7:	ndiff test: no significant differences with generic answer.
  Success	cm64:	ndiff test: no significant differences with generic answer.
  Success	cm64-debug:	ndiff test: no significant differences with generic answer.
  Success	cm64-debug-clear-malloc:	ndiff test: no significant differences with generic answer.
  rs6000-aix
  Success	cm:	ndiff test: no significant differences with generic answer.
  Success	cm-debug:	ndiff test: no significant differences with generic answer.
  Success	cm64:	ndiff test: no significant differences with generic answer.
  Success	cm64-debug:	ndiff test: no significant differences with generic answer.
  x86_64-linux
  Success	cm:	ndiff test: no significant differences with generic answer.
  Success	cm-debug:	ndiff test: no significant differences with generic answer.

  
  

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

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