How to apply PSD/random vibration excitation in 3 directions simultaneously?
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The input file below applies three psd spectrums simultaneously. /SOLU ANTYPE,SPECTRUM SPOPT,PSD DMPRAT,0.02 ! 2% damping PSDFRQ ! remove any previous spectrum that might be in memory !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 1st Spectrum PSDUNIT,1,ACCG,386.4 PSDFRQ,1,,1,3,4,100,1000 PSDVAL,1,1,1,1,1,1 DMPRAT,0.02 ! 2% D,2,UX,1,, ! excitation at node 2 PFACT,1,BASE, ! compute participation factors for first psd spectrum !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 2nd Spectrum PSDUNIT,2,ACCG,386.4 PSDFRQ,2,,1,3,4,100,1000 PSDVAL,2,2,2,2,2,2 D,2,UX,0 D,2,UY,1 PFACT,2,BASE, !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 3rd Spectrum PSDUNIT,3,ACCG,386.4 PSDFRQ,3,,1,3,4,100,1000 PSDVAL,3,3,3,3,3,3 D,2,UY,0 D,2,UZ,1 PFACT,3,BASE, PSDCOM ! PSD combination for all 3 spectrums |
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