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Found 675 results

  1. Guest

    Linear Static Analysis.

    Hi, I have attached a running board linear static analysis. I’m getting a deflection of about 0.0053mm deflection. But in real scenario they are experiencing 1 to 5mm deflection. Instead of applying load on REB3 if I applied load as a point load (single point in the middle of 200 x 80 mm) I’m getting deflection of 3mm. So what should I do here? Should I use REB3 or point load for a cross section of 200 X 80 mm Thanks, Vijay
  2. Hello, I have a laminate with 3 plies. I want to optimise the orientation of these plies such that the deflection of the laminate is minimum under the applied load. I can only perform composite shuffle, but I'm not able to optimise the ply angles. Please advice as to how to proceed to solve this issue Thanks, Kushal.
  3. A fatal error has been detected during input processing: *** ERROR # 762 *** The PID given in OBST of DTPL is already defined as a topological design property. DTPL id = 1 violated property id = 4
  4. Hi, I am trying to learn fatigue using optistruct , Please share me with the videos and fem files regarding fatigue. I already went through the fatigue tutorials in optistruct If I put all of the fatload into one fatevnt, are they now occurring simultaneously? How do I change the model that the loads occurs one after each other? Thankyou N.K
  5. Yousif

    1d fem

    Hi could somebody please answer me on this page. Thank you
  6. I am creating flexible body in optistruct of a truck chassis with trailer which is very big model with so many number of nodes and elements. CBN method is used UB_FREQ given 20 but i am getting 131 modes and fbi file size is about 15GB which is too much to import in SIMPACK and then i gave NMODES 40 but still its giving 131 modes which is very high So please help me with this Thank You
  7. I am trying to run an optimization of a design and I am receiving the error code: *** ERROR # 157 *** Error opening the scratch file "./optimization1_10188_01fm.rs~" Fortran error code = 9 This may be caused by not having the access right to open the file, not enough memory left for the system routines, or some other system setup related reasons. This error was detected in subroutine opseqsav. The computer I am using is running windows 8 with an Intel i7-4700MQ and 8GB of system ram.
  8. Hello Forum, A) OS-1380: Computation of Equivalent Radiant Power In this Tutorial I would like to know Step 2: Create ERPPNL 2.Click review and select ERP_elem In this step what criteria is used to select /specify the ERP elements. B.) For topography optimisation does optistruct implicitily reduces the ERP of component or is there is method to set this as the objective. with Regards Pratik
  9. Good evening to everyone, i'm trying to run a topological optimization but it doesn't work. looking at the .out it shows that a problem occurs in the design variables, the message is: "NO DESIGN MATERIAL OR DESIGN VARIABLES FOUND: ANALYSIS ONLY" after that the code prosecutes with the linear static analysis. The design property related to the desvar is a PSOLID; the analysis regards a mass minimization with a boundary on the maximum stress. many thanks for your help, Andrea
  10. Hi, I performed topology optimization (Upper bound displacement and minimize volfrac). But I am having problem in interpreting results. Please clear following doubts: 1) Results are very irregular. It doesn't show some material removal in some uniform shape. 2) Which iso-value should I consider? What is the use of it? 3) When I try to export it using OSSmooth, It takes input of .GRID file which I couldn't find anywhere in the folder. How do I get that .grid file.
  11. Hello, I want result of frequency response analysis in real and Imaginary form in H3D format. I have specified this in load step and also in Global output control . but still I get output in Phase imaginary form. I am want to use this Vectors Real and Imaginary further in Hyperstudy to do Model updating where I have defined my own criteria. Regards Pratik
  12. Hello I want to a component which will be tested using laser velocimeter and "Normal surface velocity" will be measured. (at some points on surface of the component) I want to have this parameter "Normal surface velocity" as output from directresponse analysis or Modal analysis from optistruct. Is it possible to have it. Thanks and regard Pratik
  13. Hello, I want to ask you that, the door which i have to optimize. I am doing it with size optimization by taking the thickness of shell elements as variable. But i am not achieving my desired results. Is there any way that, I could take the height of ribs (within the door) as variable ( door thickness as variable) which will give me desired natural frequency of the door ??? Please reply me as soon as possible with detailed answer. Thanks in advance. Regards, Hassan Razzaq
  14. hello all I am defining optimisation to reduce erp by topology optimisation. My objective is to find optimum material distribution to have low erp my defination goes as dconstraint: Erp: upper bound > (Target values) #### Volumefrac= upperbound 0.3 design volume objective= minimize design volume Loadstep = Modal frequency Response. ###For this setup I get error selected subcase not compatible with type of response while setting constraint on ERP how do i set the erp as target value. Regards Pratik
  15. Hello Group I wanted to know whether its is possible to define output as a constraint in optimisation. I am validating my modell with frequency response test I want to vary values of Material properties like Emodulus, G modulus so that at certain frequencies Frequency Response Function FRF (velocity) is say (+\- 10 % ) of the FRF calculated by test. eg Vary values of E = 1000 mpa to 2000 mpa G= 200 mpa to 400 mpa so that at node 256 Frq frf (test) frf(simulation) 5hz 0.256 (+/- 0.01) of 0.256 10hz 0.586 (+- 0.01) of 0.586 15 hz 1.457 (+- 0.01) of 1.457 etc Is it possible to define constraint this way a suggestion or example tutorial would be quit helpful Thanks and Regards Pratik
  16. Hi, I have a geometry where i already reduce its size by factor of 5 in order to reduce the element number and calculation time. But, when i run the topology optimisation, its stuck at 0 iteration with 62% progress. I don't know why this happen because i expected it the calculation time should be shorter since i reduce its size. Please explain it to me. Here is my .fem file Chassis_Facteur_5.fem
  17. Hello all, I am attempting to use some RBE3 elements to apply loads and I am receiving this error: A fatal error has been detected during input processing: *** ERROR # 774 *** When a grid's component has no stiffness, then that component cannot be an independent d.o.f. in an RBE3. RBE3 id = 270584 grid id = 326669 weighted components = 123 max d.o.f with stiff = 1 Would greatly appreciate some advice regarding this. Thanks
  18. Hi! I'm a student and I have the Student version of HyperWorks. I would like to import an STL file in Optistruct, but there isn't the choice of STL in Import Solver Deck. Is it possible to import it? Thanks Martina
  19. Hi! I try to calculate the resulting spcforces for a given displacement field on a hugh model with about 2.000.000 nodes. The displacements are applied to the model using spcs for each node and each component. This usually should be easy to calculate since the stiffness matrix does not even have to be inverted. The problem is that after the solver is finished, writing the .op2 file tooks a big amount of time... Time spent in section: SOLVER; CPU= 3916.96; WALL= 704.95 Time spent in section : OP2; CPU= 39045.11; WALL= 39026.59 Is this a common problem? For which reasons could writing the .op2 file that slow? In the following you can find the .stat file of the job: Program execution started at Wed Jun 19 12:16:49 EDT 2019 Command line arguments: mono_wo_RBE3_and_2_only_one_subcase.fem -ram=92000 same as: -len -nproc=8 Options read from config files: DOS_DRIVE_R = /. env(OS_RAM) 6000 TIME SPENT IN MODULE : READ; CPU= 133.56; WALL= 133.51 START RUNNING MODULE : PREPR1 ... TIME SPENT IN MODULE : PREPR1; CPU= 4.13; WALL= 4.18 START RUNNING MODULE : DESIGN ... TIME SPENT IN MODULE : DESIGN; CPU= 6.48; WALL= 6.47 START RUNNING MODULE : PREPRO ... Start running section : PRPDDM ... Time spent in section : PRPDDM; CPU= 0.01; WALL= 0.01 ***** datamanager call insert irlist for array size 542810504 using 32-bit ***** datamanager call insert scr4_ for array size 516096848 using 32-bit Start running section : PRPSL4 ... Time spent in section : PRPSL4; CPU= 167.88; WALL= 167.87 Request for memory resize from 9200 to 54973 MB Resize ok with new memory. TIME SPENT IN MODULE : PREPRO; CPU= 314.15; WALL= 310.87 ITERATION 0 START RUNNING MODULE : CHECKEL ... TIME SPENT IN MODULE : CHECKEL; CPU= 6.01; WALL= 3.71 START RUNNING MODULE : SOLVER ... Start running section : PRASMB ... Time spent in section : PRASMB; CPU= 0.08; WALL= 0.08 Start running section : SPASMB ... ***** datamanager call insert force for array size 2147483640 using 32-bit Time spent in section : SPASMB; CPU= 127.78; WALL= 127.71 Solving subcase 11 Solving subcase 11 Solving subcase 11 Start running section : PREFCT ... Time spent in section : PREFCT; CPU= 0.32; WALL= 0.32 Start running section : INPTVM ... Time spent in section : INPTVM; CPU= 8.34; WALL= 8.34 Start running section : FCTMTX ... Time spent in section : FCTMTX; CPU= 3660.07; WALL= 520.04 Start running section : SOLRHS ... Time spent in section : SOLRHS; CPU= 81.98; WALL= 11.57 Start running section : SAVFCT ... Time spent in section : SAVFCT; CPU= 32.89; WALL= 31.11 Start running section : STRENR ... Time spent in section : STRENR; CPU= 4.14; WALL= 3.73 Start running section : KINENR ... Time spent in section : KINENR; CPU= 0.00; WALL= 0.00 Start running section : OBJFUN ... Time spent in section : OBJFUN; CPU= 0.00; WALL= 0.00 TIME SPENT IN MODULE : SOLVER; CPU= 3916.96; WALL= 704.95 START RUNNING MODULE : STRESS ... TIME SPENT IN MODULE : STRESS; CPU= 119.78; WALL= 118.96 START RUNNING MODULE : RESP 1 ... ***** datamanager call insert scratch1 for array size 2147483620 using 32-bit TIME SPENT IN MODULE : RESP 1; CPU= 0.03; WALL= 0.03 START RUNNING MODULE : SCREEN ... TIME SPENT IN MODULE : SCREEN; CPU= 0.02; WALL= 0.02 START RUNNING MODULE :CONVERGE ... TIME SPENT IN MODULE :CONVERGE; CPU= 0.06; WALL= 0.06 START RUNNING MODULE : PRINT ... TIME SPENT IN MODULE : PRINT; CPU= 0.01; WALL= 0.01 START RUNNING MODULE : RESULTS ... ***** datamanager call insert sortres for array size 2147483640 using 32-bit Start running section : OP2 ... CASECC data block written to the .op2 file for 1 SUBCASEs. Length = 14820 words. GEOM1S data block written to the .op2 file. GEOM2S data block written to the .op2 file. GEOM3S data block written to the .op2 file. GEOM4S data block written to the .op2 file. EPTS data block written to the .op2 file. MPTS data block written to the .op2 file. OUGV1 data block written to the .op2 file for 2108395 grids. OES1X data block written to the .op2 file for 1954188 elements. Time spent in section : OP2; CPU= 39045.11; WALL= 39026.59 Start running section : MISC ... Time spent in section : MISC; CPU= 0.64; WALL= 1.29 LIMIT ON ITERATIONS REACHED. INFEASIBLE DESIGN (AT LEAST ONE CONSTRAINT VIOLATED). TIME SPENT IN MODULE : RESULTS; CPU= 39045.76; WALL= 39027.88 START RUNNING MODULE :FINISHUP ... TIME SPENT IN MODULE :FINISHUP; CPU= 4.36; WALL= 4.37 Detailed disk usage: High usage overall :96709.6 MiB, Solver scratch :41605.0 MiB, Internal database : 4109.0 MiB, Out-of-core assembly : 0.0 MiB, Temporary files :51183.6 MiB. AVERAGE SYSTEM LOAD 5.14 SOLUTION COMPLETED, THE FOLLOWING IS CPU/WALL CLOCK SUMMARY (IN SECONDS): TOTAL TIME SPENT IN MODULE :READ ; CPU= 133.56; WALL= 133.51 TOTAL TIME SPENT IN MODULE :PREPR1 ; CPU= 4.13; WALL= 4.18 TOTAL TIME SPENT IN MODULE :DESIGN ; CPU= 6.48; WALL= 6.47 Total time spent in section :PRPDDM ; CPU= 0.01; WALL= 0.01 Total time spent in section :PRPSL4 ; CPU= 167.88; WALL= 167.87 TOTAL TIME SPENT IN MODULE :PREPRO ; CPU= 314.15; WALL= 310.87 TOTAL TIME SPENT IN MODULE :CHECKEL ; CPU= 6.01; WALL= 3.71 Total time spent in section :PRASMB ; CPU= 0.08; WALL= 0.08 Total time spent in section :SPASMB ; CPU= 127.78; WALL= 127.71 Total time spent in section :PREFCT ; CPU= 0.32; WALL= 0.32 Total time spent in section :INPTVM ; CPU= 8.34; WALL= 8.34 Total time spent in section :FCTMTX ; CPU= 3660.07; WALL= 520.04 Total time spent in section :SOLRHS ; CPU= 81.98; WALL= 11.57 Total time spent in section :SAVFCT ; CPU= 32.89; WALL= 31.11 Total time spent in section :STRENR ; CPU= 4.14; WALL= 3.73 Total time spent in section :KINENR ; CPU= 0.00; WALL= 0.00 Total time spent in section :OBJFUN ; CPU= 0.00; WALL= 0.00 TOTAL TIME SPENT IN MODULE :SOLVER ; CPU= 3916.96; WALL= 704.95 TOTAL TIME SPENT IN MODULE :STRESS ; CPU= 119.78; WALL= 118.96 TOTAL TIME SPENT IN MODULE :RESP 1 ; CPU= 0.03; WALL= 0.03 TOTAL TIME SPENT IN MODULE :SCREEN ; CPU= 0.02; WALL= 0.02 TOTAL TIME SPENT IN MODULE :CONVERGE; CPU= 0.06; WALL= 0.06 TOTAL TIME SPENT IN MODULE :PRINT ; CPU= 0.01; WALL= 0.01 Total time spent in section :OP2 ; CPU= 39045.11; WALL= 39026.59 Total time spent in section :MISC ; CPU= 0.64; WALL= 1.29 TOTAL TIME SPENT IN MODULE :RESULTS ; CPU= 39045.76; WALL= 39027.88 TOTAL TIME SPENT IN MODULE :FINISHUP; CPU= 4.36; WALL= 4.37 CUMULATIVE RUN TIME: CPU= 43551.31; WALL= 40315.02 TIME SPENT IN MODULE : CLOSE; CPU= 0.46; WALL= 0.98
  20. Hello, I would like to understand what the solver is doing wile trying to solve a nonlinear problem. I understand I have stated in NLPARAM to star iteration at 1.0E-2. I have also activated ExpertNL In the next picture, what is the solver doing each iteration of each load step? what is changing? what Average U, Err. EPI, Measures EWI mean? WHat is the goal of the solver to notice it is reaching convergence?
  21. Hi everyone, I modeled an element in Altair Inspire, then I imported it in HyperWorks as a Solver deck. The mesh is created by Inspire, is there a procedure to refine the mesh o remesh the object? I tried to remesh some volumes, but the longest side of the FEs was not divided. Bests Martina
  22. I have worked before with Pretension analysis and pretension manager on Optistruct. I am obtaining this error at the moment *** ERROR # 3090 *** Normals on the cutting section of PRETENS #20 are not consistent. Do you kow what this means? Thank you!
  23. Hello Experts, I am trying to perform a complex eignevalue/ brake squeal problem on Optistruct 11. The error that i am getting is as follows:- *** ERROR # 1461 *** Card "STATSUB(PRELOAD)" is not allowed for this subcase type. I have used Generic as a solver instead of Modal Complex Eigenvalue as it doesn't support Statsub. Can anyone please explain how to resolve this issue. I have been following quite a few tutorials and have followed exactly the steps mentioned but cant get around this error. Thanks
  24. Which material card should i preferred for polypropylene copolymer? Polypropylene_Copolymer.pdf
  25. Hello,Forums I am doing analysis of a unique CFRP pipe by Optistruct. I am receiving this following error message: *** ERROR # 605 *** Element 1 is referenced by STACK 1 (on PLY 1) and by STACK 2 (on PLY 5) simultaneously. Different stacks are created by dividing the upper and lower areas of the pipe into sets. There seems to be an error because it refers to the same element Is there any good way to do it? (Modeling is possible but analysis is error) CFRP-PIPE-Asymmetric laminated.hm
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