Learning Forum

[GloriaGloria]

I need to find critical speeds. The natural frequencies are 8.29,8.29 and 45.31 Hz. There are three modes but I couldn't draw the Campbell diagram. I also want to ask after running the code; do I have to click General Post-Rotor Dynamics-Plot Campbell? If I have to, there are options and what are slope of the line and lower and of the frequency range. Thanks for the help./PREP7  n!*  nET,1,BEAM188n!*  nET,2,COMBI214  n!*  n!*  nKEYOPT,2,2,1nKEYOPT,2,3,0nKEYOPT,2,4,0n!*  nR,1, ,1.1E7,1.1E7, , , ,nRMORE, , ,  n!*  nR,2,1.1E7,1.1E7,, , , ,n!*  n!*  nMPTEMP,,,,,,,,  nMPTEMP,1,0  nMPDATA,EX,1,,2.06e11nMPDATA,PRXY,1,,0.3  nMPTEMP,,,,,,,,  nMPTEMP,1,0  nMPDATA,DENS,1,,7800 nSECTYPE,  1, BEAM, CSOLID, , 0 nSECOFFSET, CENT nSECDATA,0.035,0,0,0,0,0,0,0,0,0,0,0 nK,1,0,0,0,  nK,2,3.11,0,0,  nK,3,0,-0.2,0,  nK,4,3.11,-0.2,0,nLSTR,    1,    2  nLSTR,    1,    3  nLSTR,    2,    4  nTYPE,  1  nMAT,    1nREAL,    1  nESYS,    0  nSECNUM,  1 n!*  nLMESH,    1  nTYPE,  2  nMAT,    1nREAL,    1  nESYS,    0  nSECNUM,  1 n!*  nFLST,5,1,4,ORDE,1  nFITEM,5,2  nCM,_Y,LINE  nLSEL, , , ,P51X nCM,_Y1,LINE nCMSEL,,_Y  n!*  nTYPE,  2  nMAT,    1nREAL,    1  nESYS,    0  nSECNUM,  1 n!*  nLMESH,    2  nTYPE,  2  nMAT,    1nREAL,    2  nESYS,    0  nSECNUM,  1 n!*  nLMESH,    3  nFLST,5,1,4,ORDE,1  nFITEM,5,1  nCM,_Y,LINE  nLSEL, , , ,P51X nCM,_Y1,LINE nCMSEL,,_Y  n!*  nLESIZE,_Y1, , ,100, , , , ,1n!*  n!*  nANTYPE,2n!*  n!*  nMODOPT,LANB,3  nEQSLV,SPAR  nMXPAND,3, , ,0  nLUMPM,0 nPSTRES,0n!*  nMODOPT,LANB,3,0,0, ,OFF nFLST,2,1,3,ORDE,1  nFITEM,2,1  n!*  n/GO nDK,P51X, , , ,0,ALL, , , , , ,  nFLST,2,1,3,ORDE,1  nFITEM,2,2  n!*  n/GO nDK,P51X, , , ,0,UX,ROTY,ROTZ, , , , n!*OMEGA,5.23,0,0, n! *******************n! TRANSIENT DIAGRAMn! *******************n/ESHAPE,1.0nEPLOTn/VIEW,1,1,1,1n/ANG,1n/REPLOT,FASTnFINISH n/SOLUnANTYPE,2n!*  n!*  n! *******************n! ANALYSIS TYPEn! *******************n/POST1  nSET,LISTn*DIM,SPEED,,7! SPIN VELOCITY (RPM)  n*SET,SPEED(1) , 0n*SET,SPEED(2) , 500n*SET,SPEED(3) , 1000n*SET,SPEED(4) , 1500n*SET,SPEED(5) , 2000n*SET,SPEED(6) , 2500n*SET,SPEED(7) , 3000nRATIO = 4*ATAN(1)/30n!*ANTYPE,MODALn!*NBF = 3 ! NUMBER OF MODESnANTYPE,2n!*  n!*  nMODOPT,LANB,3  nEQSLV,SPAR  nMXPAND,3, , ,0  nLUMPM,0 nPSTRES,0n!*  n*DO,I,1,7nOMEGA,SPEED(I)*RATIO ! ROTATIONAL VELOCITY ABOUT X-DIRECTIONnMXPAND,NBFnSOLVEn*ENDDO  nFINISH  n/SOLn!* nANTYPE,3n!*  n!*  nHROPT,FULL  nHROUT,ONnLUMPM,0 n!*  nEQSLV, ,0,  nPSTRES,0n!*  n! *******************n! CAMPBELL DIAGRAMn! *******************nPRCAMP,,1,RPMn*GET,F1,CAMP,1,FREQ,3n*GET,F2,CAMP,2,FREQ,3n*GET,F3,CAMP,3,FREQ,3n*GET,F4,CAMP,4,FREQ,3n*GET,F5,CAMP,5,FREQ,3n*GET,F4,CAMP,6,FREQ,3n*GET,F5,CAMP,7,FREQ,3nFINISH

[Aniket]

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