SACS海事有限元软件培训教程Part 19 - Motion Fatigue
Preparation
1) Under “Training Project”, create “Motion Fatigue” subdirectory
2) Copy SACINP.JACKET and SACINP.DECK model file, TRNINP.DAT motion input file from “Motion” directory to “Motion Fatigue” directory.
3) Copy FTGINP.FTG from “\\Spectral Fatigue\\Fatigue” directory to “Motion Fatigue” directory and rename to FTGINP.MOTIONFTG.
Modifying motion input file TRNINP.DAT for creating transfer function load cases
On motion options line, change Load Generation Option from WS to SL, this will enable the motion program generates real and imagery RAO loads for transfer function.
Delete all wave spectral density WSPEC lines and wave spectrum load case WSLOD lines.
Change barge speed BSPEED line to only include barge speed = 4 knots.
The motion input file generated for motion fatigue shall looks like following
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MOTOPT MN 1.025 79.50 5.0 SL DT VDST STBOPT INTC ABS 6P 75.0 100.0 50.0 MOTRPT PTPTSP JCG MOTPLT TMPT
CARGO 230123052101 88.0 6.5 JACK CARGO2 1.0
INCWGT ANODLPADWKWY
CARGO 607L603L605L 18.0 6.5 DECK CARGO2 1.0
INCWGT AREAEQPTMISC
LIB_VE UR91 3.50 0.15 2.0 FCOMP 1S SETV 75.0 FCOMP 1P SETV 75.0 FCOMP 2S BLST 72.3 FCOMP 2P BLST 72.7 FCOMP 4CS SETV 100.0 FCOMP 4CP SETV 100.0 FCOMP 5CS SETV 100.0 FCOMP 5CP SETV 100.0 FCOMP 5S SETV 95.0 FCOMP 5P SETV 95.0 FCOMP 6P SETV 0.0FF
WAVPER 25.0 20.0 19.0 18.0 17.0 16.0 15.0 14.5 14.0 13.5 WAVPER 13.0 12.5 12.0 11.5 11.0 10.5 10.0 9.5 9.0 8.5 WAVPER 8.0 7.5 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.8 WAVPER 3.7 3.6 3.5 3.45 3.4 3.35 3.3 3.25 3.2 3.15 WAVPER 3.1 3.05 3.0 WAVHED 90.0 135.0 180.0 BSPEED KNT 4.00
WAVSPC PM 2.15 POINT JCG BBBB JACKCG END
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Motion Fatigue - 1
Create motion wave load run file and run the analysis.
The generated OCI file PMSOCI.INERTIALOAD contains real and imagery load cases, total load case number shall be 43 x 2 x 3 direction = 258 load cases.
Create linear static analysis run file and solve the generated real and imagery loads.
Perform linear static analysis and solve the generated OCI file PMSOCI.INERTIALOAD for fatigue analysis.
Modifying fatigue input FTGINP.MOTIONFTG file for fatigue analysis
Fatigue options line: Chang number of additional postfile = 0;
Chang design life to 40 years; Delete fatigue time period;
Delete all joint overrides;
Change group selection line to remove member group CAN from fatigue analysis.
Change joint selection line, remove 401L to 407L, add 101L to 107L.
Delete SCF selection line.
All three spectral wave fatigue case FTLOAD lines need to be modified to select R+I for cyclic stress option, to add wave directions 90.0, 135.0 and 180.0 correspondingly.
The fatigue input file generated for motion fatigue shall looks like following
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FATGIUE INPUT
FTOPT 40. 2. SMAPP MXMNSK LPEFT FTOPT2 PTVC GRPSEL RM CAN
JSLC 101L103L105L107L201L203L205L207L301L303L305L307L SCFLM 6.0 1.5 RELIEF SEAS
FTLOAD 1 .47 1.0 SPC R+I 90.0 SCATD D 1.0 1.0 PM SCWAV 0.30 1.0 2.0 SCPER 1.5 .15 .1 .1 SCPER 3.0 .1 .19 .11 SCPER 5.0 .05 .08 .05 SCPER 8.0 .02 .03 .02
FTLOAD 2 .20 1.0 SPC R+I 135.0 SCATD D 1.0 1.0 PM SCWAV 0.30 1.0 2.0 SCPER 1.5 .10 .13 .08 SCPER 3.0 .15 .13 .10 SCPER 5.0 .08 .08 .07
Motion Fatigue - 2
SCPER 8.0 .03 .02 .03
FTLOAD 3 .33 1.0 SPC R+I 180.0 SCATD D 1.0 1.0 PM SCWAV 0.30 1.0 2.0 SCPER 1.5 .13 .10 .08 SCPER 3.0 .13 .15 .10 SCPER 5.0 .06 .09 .08 SCPER 8.0 .03 .03 .02 EXTRAC HEAD AE 0.5 END
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Create fatigue run file and execute the analysis
Create fatigue run file and run the analysis. Input PMSOCI.INERTIALOAD for Seastate file when asked. Browse for results.
Motion Fatigue - 3
Portion of motion fatigue analysis report for joint 307L and 303L:
----------------------------------------------------------------------------------------------------------------------------------- * * * M E M B E R F A T I G U E R E P O R T * * * (DAMAGE ORDER)
ORIGINAL CHORD REQUIRED JOINT MEMBER GRUP TYPE OD WT JNT MEM LEN. GAP * STRESS CONC. FACTORS * FATIGUE RESULTS OD WT ID ID (CM) (CM) TYP TYP (M ) (CM) AX-CR AX-SD IN-PL OU-PL DAMAGE LOC SVC LIFE (CM) (CM)
307L 203L-307L D02 TUB 50.75 2.000 TK BRC 26.26 61.01 3.39 3.36 3.01 2.94 .0348016 B 1149.372 307L 207L-307L LG2 TUB 107.00 3.500 TK CHD 26.26 4.41 4.60 1.91 3.23 .467-2 BL 8608.219
307L 205L-307L D02 TUB 50.75 2.000 TK BRC 26.26 36.86 3.05 3.01 3.02 3.12 .0771886 TL 518.2112 307L 207L-307L LG2 TUB 107.00 3.500 TK CHD 26.26 3. 3.98 1. 3.43 .0788329 L 507.4021
307L 307L-403L D03 TUB 40.75 1.500 TK BRC 26.26 61.01 2.82 2.00 2.94 1.61 .06228 B 2.1597 307L 307L-407L LG3 TUB 107.00 3.500 TK CHD 26.26 2.66 1.87 1.50 1.55 .51860-2 B 7713.014
307L 307L-405L D03 TUB 40.75 1.500 TK BRC 26.26 36.86 2.26 2.23 2.81 2.55 .0574399 BL 696.3803 307L 307L-407L LG3 TUB 107.00 3.500 TK CHD 26.26 2.34 2.32 1.50 2.28 .0172926 BL 2313.132
307L 303L-307L H31 TUB 40.75 1.500 TK BRC 26.26 61.01 4.16 5.65 2.55 4.57 .0355946 R 1123.766 307L 307L-407L LG3 TUB 107.00 3.500 TK CHD 26.26 4.73 5.60 2.02 4.08 .0235709 R 1697.007
307L 305L-307L H31 TUB 40.75 1.500 TK BRC 26.26 36.86 4.12 5.25 2.55 4.65 .69241 R 57.43627 307L 307L-407L LG3 TUB 107.00 3.500 TK CHD 26.26 4.46 5.12 2.02 4.15 .5511839 R 72.57105
307L 307L-3000 H32 TUB 40.75 1.500 Y BRC 26.26 0.00 3.47 6.00 2.55 4.52 1.187094 R 33.69573 307L 307L-407L LG3 TUB 107.00 3.500 Y CHD 26.26 4.52 6.00 2.01 4.03 .9545278 R 41.90554
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303L 201L-303L D02 TUB 50.75 2.000 TK BRC 26.26 36.86 3.11 3.07 3.02 3.13 .0750368 R 533.0719 303L 203L-303L LG2 TUB 107.00 3.500 TK CHD 26.26 3.97 4.08 1. 3.43 .1607313 R 248.8625
303L 303L-401L D03 TUB 40.75 1.500 TK BRC 26.26 36.86 2.27 2.23 2.81 2.49 .25730-2 R 15546.03 303L 303L-403L LG3 TUB 107.00 3.500 TK CHD 26.26 2.35 2.32 1.50 2.22 .15755-2 R 253.19
303L 301L-303L H31 TUB 40.75 1.500 TK BRC 26.26 36.86 4.17 5.20 2.55 4.69 .3656560 L 109.3924 303L 303L-403L LG3 TUB 107.00 3.500 TK CHD 26.26 4.46 5.06 2.02 4.18 .2602990 L 153.6694
303L 303L-307L H31 TUB 40.75 1.500 Y BRC 26.26 0.00 3.47 6.00 2.55 4.55 .0800176 R 499. 303L 303L-403L LG3 TUB 107.00 3.500 Y CHD 26.26 4.53 6.00 2.02 4.06 .05550 R 708.5293
303L 303L-3000 H32 TUB 40.75 1.500 Y BRC 26.26 0.00 3.47 6.00 2.55 4.52 1.016270 L 39.35963 303L 303L-403L LG3 TUB 107.00 3.500 Y CHD 26.26 4.52 6.00 2.01 4.03 .8556877 L 46.74603
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Motion Fatigue - 4
