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sol200; fit accPSD response to test results

adam.narozniak
I have a 2 mass and 2 spring system which has test response specified in DABLED1​. I would like to find spring stiffneses to match the test result. How to define the objective function in such case?
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  • 0
    See attached PDF. Slide S30 shows a setup. For your model you could use the table constraints on your response shown in S37.
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  • 0
    It does not work.​ If I make it like this:
     
    DCONSTR 800   801     17            20.    2000.
    DRESP1  801   PSDpar  PSDACCL 1000             3     MAX   2
     
    TABLED1 17     log    log                                                    
    +      20.    0.16   21.33  0.17   23.28  0.19   27.18  0.23   +      
    +      72.37  2.41   84.49  7.71   92.24  34.09  98.36  237.82 +      
    +      102.26 66.3   107.83 14.6   118.4  3.4    213.95 0.32   +      
    +      234.92 0.65   247.71 1.91   257.52 5.02   279.72 0.24   +      
    +      313.17 0.02   382.18 0.01   1347.62 0.01   1644.6 0.01   +      
    +      1841.28 0.01   2000.  0.01   ENDT  
     
     
    I got an error:
        "DCONSTR ASSOCIATED WITH DRESP1     801, AN IMPLIED DRESP2, CAN NOT REFERENCE TABLEDx ID IN LALLOW AND/OR UALLOW FIELDS.
        USER ACTION: SPECIFIC ALLOWABLES IN REAL NUMBER MUST BE PROVIDED ON DCONSTR FOR AN IMPLIED DRESP2."
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  • 0
    Attached modified file.
     
    DRESP1  801  PSDpar  PSDACCL 1000       3   10.   2
    This will work.
    -------------------
    DRESP1  801  PSDpar  PSDACCL 1000       3   MAX  2
     
    MAX is not allowed. It can take input at specific freq only.
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