*HEADING STEADY STATE DYNAMICS PROCEDURES - /STANDARD VERIFICATION, 2D CONNECTORS ** *NODE, NSET=NALL 1,0.0,0.0, 2,1.0,0.0, 3,2.0,0.0, 4,3.0,0.0, *NSET, NSET=FIXED 1,4 *PARAMETER C=1.0 KROT1=1.0E3 UR1=1.0E-3 KROT2=KROT1/10 UR2=100*UR1 M1=KROT1*UR1 M2=M1+KROT2*(UR2-UR1) mM1=-M1 mM2=-M2 mUR1=-UR1 mUR2=-UR2 ** ** CONNECTOR ELEMENTS ** *ELEMENT, TYPE=CONN2D2, ELSET=ROT 1,1,2 2,2,3 *ELEMENT, TYPE=CONN2D2, ELSET=ACTUATOR 3,3,4 *ELSET, ELSET=CONNECTORS ROT,ACTUATOR ** ** ROTARY INERTIA ** *ELEMENT, TYPE=ROTARYI, ELSET=ROTARY 1001,1 1002,2 1003,3 1004,4 ** ** SECTION DEFINITIONS ** *ROTARY INERTIA, ELSET=ROTARY ,,1.0, *CONNECTOR SECTION, ELSET=ROT, BEHAVIOR= CB_ROT ROTATION *CONNECTOR SECTION, ELSET=ACTUATOR ROTATION ** ** CONNECTOR BEHAVIOR DEFINITIONS ** *CONNECTOR BEHAVIOR, NAME= CB_ROT *CONNECTOR ELASTICITY, COMPONENT=6, NONLINEAR , , , , *CONNECTOR DAMPING, COMPONENT=6 , ** ** BOUNDARY CONSTRAINTS (BASE STATE) ** *BOUNDARY NALL,4,5 FIXED,6, ** ** *STEP STEP-1: OBTAIN NATURAL MODES OF THE 2-D.O.F. SYSTEM ** *FREQUENCY, EIGENSOLVER=SUBSPACE, SIM=NO 2, ** *OUTPUT, FIELD *NODE OUTPUT U,RF *ELEMENT OUTPUT, ELSET=CONNECTORS CU,CTF *NODE PRINT UR3,RM3 *EL PRINT, ELSET=ROT CTM3,CEM3,CRM3 CUR3, *EL PRINT, ELSET=ACTUATOR CTM3,CEM3,CRM3 CUR3, *NODE FILE U,RF *EL FILE, ELSET=CONNECTORS CTF,CEF,CRF,CU *END STEP ** ** *STEP STEP-2: OBTAIN STEADY STATE DYNAMIC RESPONSE IN TERMS OF PHYSICAL DEGREES OF FREEDOM - DIRECT ** USE CONNECTOR LOAD ** *STEADY STATE DYNAMICS, DIRECT, INTERVAL=EIGENFREQUENCY 12, 60 ** *CONNECTOR LOAD, LOAD CASE=1 ACTUATOR,6,-1.0 *CONNECTOR LOAD, LOAD CASE=2 ACTUATOR,6,-1.0 ** *OUTPUT, FIELD *NODE OUTPUT U,RF *ELEMENT OUTPUT, ELSET=CONNECTORS CU,CTF *OUTPUT, HISTORY *ELEMENT OUTPUT, ELSET=CONNECTORS CTM3,CEM3,CVM3,CRM3 CUR3, *NODE PRINT, FREQUENCY=1 UR3,VR3,AR3,PUR3 CM3,RM3 *EL PRINT, ELSET=ROT, FREQUENCY=1 CTM3,CEM3,CVM3,CRM3 PHCTM3,PHCEM3,PHCVM3,PHCRM3 CUR3,PHCUR3 *EL PRINT, ELSET=ACTUATOR, FREQUENCY=1 CTM3,CEM3,CVM3,CRM3 PHCTM3,PHCEM3,PHCVM3,PHCRM3 CUR3,PHCUR3 *NODE FILE U,RF *EL FILE, ELSET=CONNECTORS CTF,CEF,CVF,CRF PHCTF,PHCEF,PHCVF,PHCRF CU,PHCU *END STEP ** ** *STEP STEP-3: OBTAIN STEADY STATE DYNAMIC RESPONSE IN TERMS OF PHYSICAL DEGREES OF FREEDOM - DIRECT ** USE *CONNECTOR MOTION ** *STEADY STATE DYNAMICS, DIRECT, INTERVAL=EIGENFREQUENCY 12, 60 ** *OUTPUT, FIELD *ELEMENT OUTPUT, ELSET=CONNECTORS CU,CTF *CONNECTOR MOTION, LOAD CASE=1 ACTUATOR,6,-0.1 *CONNECTOR MOTION, LOAD CASE=2 ACTUATOR,6,-0.1 *END STEP ** ** *STEP STEP-4: OBTAIN STEADY STATE DYNAMIC RESPONSE IN TERMS OF THE SYSTEM'S EIGENMODES - MODE BASED ** *STEADY STATE DYNAMICS, INTERVAL=EIGENFREQUENCY 12, 60 ** *OUTPUT, FIELD *ELEMENT OUTPUT, ELSET=CONNECTORS CU,CTF *CONNECTOR LOAD, LOAD CASE=1 ACTUATOR,6,-1.0 *CONNECTOR LOAD, LOAD CASE=2 ACTUATOR,6,-1.0 *END STEP ** ** *STEP STEP-5: OBTAIN STEADY STATE DYNAMIC RESPONSE IN TERMS OF THE SYSTEM'S EIGENMODES - SUBSPACE PROJECTION ** *STEADY STATE DYNAMICS, SUBSPACE PROJECTION, INTERVAL=EIGENFREQUENCY 12, 60 ** *OUTPUT, FIELD *ELEMENT OUTPUT, ELSET=CONNECTORS CU,CTF *CONNECTOR LOAD, LOAD CASE=1 ACTUATOR,6,-1.0 *CONNECTOR LOAD, LOAD CASE=2 ACTUATOR,6,-1.0 *END STEP ** ** *STEP, NLGEOM STEP-6: CHANGE THE BASE STATE ** *STATIC 0.1,1.0 *CLOAD 2,6,2.0 ** *OUTPUT, FIELD *NODE OUTPUT U,RF *ELEMENT OUTPUT, ELSET=CONNECTORS CU,CTF *ELEMENT OUTPUT NFORC,ELEN *OUTPUT, HISTORY *ELEMENT OUTPUT, ELSET=CONNECTORS CTM3,CEM3,CVM3,CRM3 CUR3,CPR3 *NODE PRINT, FREQUENCY=1 UR3,CM3,RM3 *EL PRINT, ELSET=ROT, FREQUENCY=1 CTM3,CEM3,CVM3,CRM3 CUR3,CPR3 *EL PRINT, ELSET=ACTUATOR, FREQUENCY=1 CTM3,CEM3,CVM3,CRM3 CUR3,CPR3 *NODE FILE U,RF *EL FILE, ELSET=CONNECTORS CTF,CEF,CVF,CRF,CP,CU *END STEP ** ** REPEAT ALL STEPS ** *STEP STEP-7: OBTAIN NATURAL MODES OF THE 2-D.O.F. SYSTEM ** *FREQUENCY, EIGENSOLVER=SUBSPACE, SIM=NO 2, ** *OUTPUT, FIELD *NODE OUTPUT U,RF *ELEMENT OUTPUT, ELSET=CONNECTORS CU,CTF *NODE PRINT UR3,RM3 *EL PRINT, ELSET=ROT CTM3,CEM3,CRM3 CUR3, *EL PRINT, ELSET=ACTUATOR CTM3,CEM3,CRM3 CUR3, *NODE FILE U,RF *EL FILE, ELSET=CONNECTORS CTF,CEF,CRF,CU *END STEP ** ** *STEP STEP-8: OBTAIN STEADY STATE DYNAMIC RESPONSE IN TERMS OF PHYSICAL DEGREES OF FREEDOM - DIRECT ** USE CONNECTOR LOAD ** *STEADY STATE DYNAMICS, DIRECT, INTERVAL=EIGENFREQUENCY 12, 60 ** *CONNECTOR LOAD, LOAD CASE=1 ACTUATOR,6,-1.0 *CONNECTOR LOAD, LOAD CASE=2 ACTUATOR,6,-1.0 ** *OUTPUT, FIELD *NODE OUTPUT U,RF *ELEMENT OUTPUT, ELSET=CONNECTORS CU,CTF *OUTPUT, HISTORY *ELEMENT OUTPUT, ELSET=CONNECTORS CTM3,CEM3,CVM3,CRM3 CUR3, *NODE PRINT, FREQUENCY=1 UR3,VR3,AR3,PUR3 CM3,RM3 *EL PRINT, ELSET=ROT, FREQUENCY=1 CTM3,CEM3,CVM3,CRM3 PHCTM3,PHCEM3,PHCVM3,PHCRM3 CUR3,PHCUR3 *EL PRINT, ELSET=ACTUATOR, FREQUENCY=1 CTM3,CEM3,CVM3,CRM3 PHCTM3,PHCEM3,PHCVM3,PHCRM3 CUR3,PHCUR3 *NODE FILE U,RF *EL FILE, ELSET=CONNECTORS CTF,CEF,CVF,CRF PHCTF,PHCEF,PHCVF,PHCRF CU,PHCU *END STEP ** ** *STEP STEP-9: OBTAIN STEADY STATE DYNAMIC RESPONSE IN TERMS OF PHYSICAL DEGREES OF FREEDOM - DIRECT ** USE *CONNECTOR MOTION ** *STEADY STATE DYNAMICS, DIRECT, INTERVAL=EIGENFREQUENCY 12, 60 ** *OUTPUT, FIELD *ELEMENT OUTPUT, ELSET=CONNECTORS CU,CTF *CONNECTOR MOTION, LOAD CASE=1 ACTUATOR,6,-0.1 *CONNECTOR MOTION, LOAD CASE=2 ACTUATOR,6,-0.1 *END STEP ** ** *STEP STEP-10: OBTAIN STEADY STATE DYNAMIC RESPONSE IN TERMS OF THE SYSTEM'S EIGENMODES - MODE BASED ** *STEADY STATE DYNAMICS, INTERVAL=EIGENFREQUENCY 12, 60 ** *OUTPUT, FIELD *ELEMENT OUTPUT, ELSET=CONNECTORS CU,CTF *CONNECTOR LOAD, LOAD CASE=1 ACTUATOR,6,-1.0 *CONNECTOR LOAD, LOAD CASE=2 ACTUATOR,6,-1.0 *END STEP ** ** *STEP STEP-11: OBTAIN STEADY STATE DYNAMIC RESPONSE IN TERMS OF THE SYSTEM'S EIGENMODES - SUBSPACE PROJECTION ** *STEADY STATE DYNAMICS, SUBSPACE PROJECTION, INTERVAL=EIGENFREQUENCY 12, 60 ** *OUTPUT, FIELD *ELEMENT OUTPUT, ELSET=CONNECTORS CU,CTF *CONNECTOR LOAD, LOAD CASE=1 ACTUATOR,6,-1.0 *CONNECTOR LOAD, LOAD CASE=2 ACTUATOR,6,-1.0 *END STEP