Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. Burner2k

    MSC Patran Composite Question & a Vibration Analysis Question

    Greglock, thanks for the response on range.
  2. Burner2k

    MSC Patran Composite Question & a Vibration Analysis Question

    At least in Femap, it GUI clearly shows which side is Top. I went through MSC documentation on Patran & so far I have not come across any content regarding which side is Top or Bottom. I think I will import the input deck in to Femap and find out there. RB1957, using global ply IDs, one can...
  3. Burner2k

    MSC Patran Composite Question & a Vibration Analysis Question

    Hello, I have a basic question regarding modeling composite laminates using MSC Patran. I need to edit input deck files that I receive from my colleagues and I use MSC Patran to do the same. I use the PCOMP editor and I have asked this question to our MSC seller as well but I am not convinced by...
  4. Burner2k

    Help with FEA Verification

    Karachun, Thanks for detailed explanation. I will download your sample file and check on weekend. I have one more question. Perhaps it is a little bit advanced at this stage. In the test example, I know the type of loading and the response from it (Tensile -> stretching/extension) or a simple...
  5. Burner2k

    Help with FEA Verification

    Hi GregLocock, there is no damping specified. The X axis on the output graphs represent case # (Case 0 will be at 0 sec & Case 33 will be at 7.75E-5 sec)
  6. Burner2k

    Help with FEA Verification

    Firstly, I apologize for the numbers not showing up big enough to be read. Secondly, thanks GregLocock & karachun for your replies. Karachun, I followed your suggestions. I ran SOL 103 Normal modes analysis and the corresponding frequency for which axial mode gets excited is 12900 Hz T =...
  7. Burner2k

    Help with FEA Verification

    Thanks for the replies. I have asked my company to purchase Blevins. In the meanwhile, I did run a small test case and I got results which just confused me more. I have to admit that my understanding of Dynamic systems is evolving. I hope the images are clear enough. Please help me out in...
  8. Burner2k

    Help with FEA Verification

    Hello, I am looking to some help (references) about verification of FEA methodology. Specifically for transient dynamic analysis. I am thinking of a simple tensile load or pointed transverse load on cantilever as shown below. I will first try with axial since it will be a single DOF system &...
  9. Burner2k

    Strain Gauging Instrumentation Help

    Thanks all for the replies. Since we are starting from scratch (or near scratch), many of the points mention here have to be learnt. Please keep on bring in relevant pointers from your experience. I may not have the answer but it will help us on giving some thought towards accommodating the...
  10. Burner2k

    Strain Gauging Instrumentation Help

    Hi all, Firstly, thanks for the many replies. After some research & consultation with people who have had some experience with aerospace testing, we will be proceeding with instrumenting our ground test articles. A few questions: 1. Our wings are composite fibers. Any special considerations...
  11. Burner2k

    Strain Gauging Instrumentation Help

    @SWComposites & RB1957, Our "bird" is a small UAV & we're located outside of US & EU . There are no certification requirements for our product. Our intentions of putting strain gauges are purely for research. Thanks for the few pointers you've shared. My intuitions were correct...this ain't...
  12. Burner2k

    Strain Gauging Instrumentation Help

    Hello, We are planning to strain gauge instrumenting our birds during ground static tests and flights. I am looking for some references & pointers on how to accomplish the same. I need help in the following: 1. Determine suitable locations on Wings/Fuselage from Finite Element Models. If I am...
  13. Burner2k

    Help with Inertia Relief & RBE Issue

    I wanted some tips on simulating recoil force on our launcher. The launch is being done by pneumatic means and considering the pressures we have, the recoil force is gonna be significant. For verification, I want to do a FEA. The setup illustration is shown below. Obviously, I've...
  14. Burner2k

    Help with Inertia Relief & RBE Issue

    RB1957 & dmapguru, Firstly, sorry for the late replies. Last month has been super crazy and super busy for me. RB, we have decided to go with steel even though that would make our product heavier than we'd like. This launcher would be a ground based system and& a proof of test article and to...
  15. Burner2k

    Help with Inertia Relief & RBE Issue

    For the initial set of prototypes, we will be using Aluminum since excess weight is a consideration but not a requirement. Just part of overall literature survey, was curious to figure out what kind of material these types of launchers might be using...
  16. Burner2k

    Help with Inertia Relief & RBE Issue

    I have a different question but related to the above. Typically, what materials are these tubes made of? At least the contemporary ones? Example of a contemporary system would be Common Launch Tube (CLT)...Composites are a great choice...just wondering if other materials (other than metallic...
  17. Burner2k

    Help with Inertia Relief & RBE Issue

    ^^This was a first cut analysis to give us a starting point on our sizing. The contained carries an object which has significant mass. Currently, I created another node (offset from CG by a small distance) & applied the acceleration as a statically equivalent load (m x a) & ran an IR SOL 101...
  18. Burner2k

    Help with Inertia Relief & RBE Issue

    @SWComposites, in Inertia Relief, I know for sure GRAV cards get cancelled out...probably same is true for Accelerations as well. The analysis will run but the output is all zero (zero deflections, zero stresses etc.)
  19. Burner2k

    Help with Inertia Relief & RBE Issue

    RB1957 & SWComposites, I am modeling just the projectile (or structure). The tube is not considered here. The objective is to assess the integrity of the structure (skin as of now with layup definiton) under sudden acceleration (NOTE: After the initial instantaneous acceleration...there are no...
  20. Burner2k

    Help with Inertia Relief & RBE Issue

    Here is the setup of my problem. I have a projectile which is being launched from a tube. I need to do a static analysis on the projectile. Objective is to ascertain integrity of the structure during launch. I have quasi-static loads (in terms of Gs) which the projectile will experience at the...

Part and Inventory Search

Back
Top