February 13, 2021 at 5:35 pmGloriaGloriaSubscriberI 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
February 15, 2021 at 12:43 pmAniketAnsys EmployeeAnsys staff can not download any files on the forum, so if you want to reach a larger audience to get answers from, please insert inline images describing your problem.nBTW, can you please check if the following helps:nhttps://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v201/en/ans_rot/Hlp_G_ROTEXAMPLES.htmln-AniketnHow to access Ansys help linksnGuidelines for Posting on Ansys Learning Forumn
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