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      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 

vikas kenchapur

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vikas kenchapur last won the day on September 7

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About vikas kenchapur

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  1. Computational aeroacoustics

    Hi Sumit, You may want to re-post this under IND - HyperWorks CFD forum Thanks, Vikas
  2. Hi, Random response analysis is a transfer function of FRF and is a mode based procedure. You need to have these load collectors like RLOAD2, DAREA, FREQi etc as inputs for FRF analysis. I presume ANSYS applies a unit load by default for FRF and then uses it as transfer function to RRA Thanks, Vikas
  3. Contact penetration

    Sure, shall upload it shortly Thanks, Vikas
  4. Hi Vinay, Can you try mapping the temperature results from a steady state thermal analysis into structural mesh using linear interpolation method available in HM under TEMP load. You can then perform either a linear/non-linear static analysis with TEMP as load. Please see the below lines: $ SUBCASE 1 LABEL Thermal ANALYSIS NLSTAT SPC = 1 NLPARM = 6 TEMPERATURE(LOAD) = 2 $ BEGIN BULK $ TEMP 2 1 66.0 TEMP 2 2 66.0 TEMP 2 3 66.0 TEMP 2 4 66.0 TEMP 2 5 66.0 TEMP 2 4099 66.0 Thanks, Vikas
  5. Hi Suresh, Could you please let us know the company you are associated with Thanks Vikas
  6. Hi Manju, Op2 is not a native output file of OptiStruct but of Nastran. Traditionally Op2 files require huge disk as they are not compressed. We suggest you to output the results in .h3d format which is a native output file of OptiStruct. H3D files are super compressed and typically takes few Mbs against few Gbs of Op2 Thanks, Vikas
  7. Hi Anup, Attached document should help you to setup the superelement analysis in OptiStruct Thanks, Vikas SuperElement_Analysis.docx
  8. optimization run time

    Hi Manohar, Elapsed time is the actual time taken by the solver to complete the job. CPU time is the process time and is the amount of time for which CPU was used for processing instructions of a job. Thanks, Vikas

    Hi Uday, Let me answer to your queries in order 1. YES 2. Damping is inherent property of any structure. It is necessary to provide damping to the structure to dampen the transient behavior over time and to find a steady state condition. There are several ways to define damping in OS. Please refer to our help manual for detailed information on the same. 3. The transient load case in OS is linear and do not take the effect of MATS1 card. If you would like to include them, then you must perform either NLSTAT or NLTRAN load cases. Please add PARAM,NLFAT,YES to force OptiStruct to run models in which fatigue solutions reference small displacement nonlinear analysis (NLSTAT) subcases . Thanks, Vikas

    Hi Udhay, Please crate a load collector with no card image. Click on analysis > constraints > change load type to SPCD and pick the nodes where you want to define load.Give the unit value in all 6 directions (DOF 1-6) create another load collector with card image tabled1 and define the acceleration vs time values here. now create another load collector with card image as TLOAD1 and pick the SPCD load collector under EXECTID field Tabled1 under TID field and set the type to ACCE call this TLOAD1 under DLOAD while creating the transient load step. Currently I don't have acces to laptop, I can send the sample deck by tomorrow Thanks Vikas

    We shall send you a sample deck shortly Thanks, Vikas

    Hi Uday, What is the component being tested? You can perform this with a transient dynamic analysis. You can define the G loads using SPCD with ACCELERATION load type in all the 6 directions. The SPCDs with ACCELERATION as load type depending on time can be defined via TABLED1 card. Thanks, Vikas

    Hi Uday, Are you performing a dynamic analysis or a static analysis Thanks, Vikas
  14. The thickness of gasket should be enough to flow or yield the gasket material. The gasket thickness plays a vital role in deciding the gasket stiffness & gasket closure curve is function of gasket thickness. It is important to study the pressure and closure distance in thickness direction of a gasket element to estimate the leakage and hence the output variables as Gasket Thickness- direction pressure. While, Contact traction/pressure is the Generalized pressure caused by the interaction of contact bodies in normal and tangential directions and is not specific to gaskets Thanks, Vikas
  15. Pratik, Typically this section of the forum is meant for commercial users of HW. We do have a separate section for Global acedamic students. Probably you can use that to post your queries the next time. Let me try to answer to you question for now. Generally, the Gasket and Bolt assembly is driven by a frictional contact analysis. You can define the friction for each contact pair through a PCONT property collector. You can then flag this under PID field of CONTACT card. Hope this helps. Thanks Vikas