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  1. PLCKing

    Pneumatic Proportional Rotary Actuator

    Right I forgot, the torque required would be aroudn 75 in-lb. I'll check out those manufacturers. Thanks!
  2. PLCKing

    Pneumatic Proportional Rotary Actuator

    Hi, Not sure if this is the right forum for pneumatics, but it was the closest I could find on this site. I'm trying to source out a Proportional Rotary actuator, but all I can find for rotary actuators is fully closed or fully open actuation and nothing in between. There are some like the...
  3. PLCKing

    Non-Linear Mesh

    Is there a reason why you can't mesh a beam element with a beam mesh when doing Non-linear anlalysis or a drop test in Solidworks Simulation 2009?
  4. PLCKing

    Structural Steels Modeling

    The difference between a linear and non-linear analysis is the varience in the stiffness of the material as a load is applied. Since a HSS(square tube) beam has a different stiffness then a C channel, would this mean that you need to do a non-linear analysis to see the difference each...
  5. PLCKing

    Structural Steels Modeling

    That's great information. I'll play around with it a bit more and see what I come up with. For some reason in solidworks simulation 2009, if you want to do a non-linear analysis, then you can't change mesh types from solid mesh to beam(or I have't figured out yet how). Thanks for the...
  6. PLCKing

    Cosmos & structural steels

    I have a frame made out of 5"X4"X3/16" HSS. I want to run some load analysis and I want to compare the strenght results if the top X beam is HSS or an Angle beam (all other beams will be HSS). For this analysis, you need to use the beam mesh, but how does the beam mesh know if the X beam is...
  7. PLCKing

    Structural Steels Modeling

    Thanks for the reply, I'll try to move it into the solidworks forum. I agree that solid mesh is not the best, but then how do you go about modeling different types of strucutral members? Also, the model has solid blocks in it for the coner re-enforcements. Can you mix beam and solid meshes in...
  8. PLCKing

    Structural Steels Modeling

    I wasn't sure how to edit my post and move it to the right place, so I'm re-posting it in the right place instead. If an administrator could erase the original from the Structural->other thread. Thanks, I'm using solidworks/cosmosworks to model a structural frame that's made up of structural...
  9. PLCKing

    Correct Formula?

    The area was based on a 1/3 of the cylindrical tank sticking out of the rectangular tank. I worked it out to 0.55 m^2 including the flat ends of the cyclindrical tank. Now assuming the cylindrical tank is fully submerged inside the rectangular tank that's full of water at 50 deg C, and the...
  10. PLCKing

    Correct Formula?

    Thanks for the replys guys. I see so what I've been calculating is the maximum amount of heat transfer through the exposed aluminum at a 30 deg C temperature difference. I agree that convection accross the exposed top cylindrical tank is a better way to go. I'll look through my book to see...
  11. PLCKing

    Correct Formula?

    I have a 24" dia x 22" long cyclindrical aluminum tank 1/4" thick. This tank is filled with diesel fuel. I need to place this tank inside a reactangular (26"x26"x16"high) aluminum tank 1/4" thick that will be filled with water. The water tank (rectangular) will have an inlet and an outlet to...
  12. PLCKing

    CosmosWorks Results Accurate?

    The CosmosWorks version I'm using doesn't have non-linear analysis in it. I understand that the non-linear analysis would give more accurate results (I'd expect lower resulting stresses), but how much more accurate? 10%, 20% 50%? PKing
  13. PLCKing

    CosmosWorks Results Accurate?

    GBor, the stresses in the web of the stiffener are at max in the middle of the stiffener and then go approx. a 1/3 of the length each way from the middle. I'm not sure how I can post a pic, but if I figure it out I'll put it up. For the UL142 testing, I believe that you can go above the...
  14. PLCKing

    CosmosWorks Results Accurate?

    The excessive stress covers most of the stiffeners "web" and also the top plate. I was trying to get an idea of how much I need to "beef up" the design so it would pass the 175 kPa test. Do I need to get the stressed below 58 ksi (A36's UTS) or do I need to get below the yield stress of 36...
  15. PLCKing

    CosmosWorks Results Accurate?

    Yes,you're right rb1957, 30 psig is 207 kPa, I was putting in 5 psig as a safety factor. Yes, the tip of the stiffener will let go first as that tha's the highest stress concentration, but that part will be welded to the side of the tank, so a strong weld will be important there. But I was...
  16. PLCKing

    CosmosWorks Results Accurate?

    I appreciate all the replies, you guys have given me excellent information to go on with. I have a couple more questions. This analysis I’m modeling is for a UL142 specification tank. The UL certification test requires for the tank to be pressurized to 175 kPa and held for 2 minutes. During...
  17. PLCKing

    CosmosWorks Results Accurate?

    I'm using solidworks office premium 2007, so I'm hoping the bugs are worked out. I am running it as a non-linear analysis. For some reason I can't get the shell mesh using surfaces to work properly when being analyzed. I select the plate face and give it a thickness, then I select each of the...
  18. PLCKing

    CosmosWorks Results Accurate?

    Thanks for the replys guys I appreciate your help with this. The problem I was having with using shell elements is that I'm modeling it as an assembly and in an assembly you need to select reference faces and then give it some thickness. When I do this, for some reason the analysis fails. I...
  19. PLCKing

    CosmosWorks Results Accurate?

    I'm doing a FEA model of stresses in a plate. The plate ASTM A36 steel and dimensions are 140" x 250" x 0.25" thick. The plate is restrained along all 4 0.25" edges. The bottom side has stiffeners that are 0.125" thick and also A36 material and are spaced every 16". The stiffeners are "L"...
  20. PLCKing

    Circuit Breaker Sizing

    Hello, I have a 30Amp 24VDC power supply. The power input to the power supply is 480VAC and the output from the power supply is 24VDC. I want to put a 3-phase circuit breaker before the power supply, but I'm having a hard time sizing the circuit breaker. Is there a formula that I can use for...

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