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  • Users: magnusrm
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  1. magnusrm

    Calculation of vertical waterflow caused by air bubbles

    Hi guys. Im working on a project where we need to estimate vertical flow in a wide vertical tube caused by a stream of air bubbles released at the bottom. I have Solidworks Flow, but this is as far as i understand not suitable for this kind of calculation. Do you have any tips to the easiest...
  2. magnusrm

    Rubber properties under isostatic pressure

    Hi guys. I wonder if you have any idea if standard NBR70 rubber will stiffen significantly under high isostatic pressures? The rubber in question is used on a ultra deep water ROV, which operates at 6000m depth. We are wondering if the rubber changes properties when the pressure is about 60MPa?
  3. magnusrm

    High pressure window sealing

    Hi. Im looking at a deep sea underwater camera housing, with a conical acrylic window. At first I thought I would go for place the O-ring grooves on the conical part of the contact face(A), as this would lead to a tight fit, and minimum extrusion risk. I was worried about the contact...
  4. magnusrm

    High torque planetary gear with low ratio

    Hi, im designing a motor which needs a planetary gear with low ratio, 1:2 is ideal, but due to the principle of ( ratio ) = (sun teeth + ring teeth)/(sun teeth) thats not possible. The motor has an output torque of 85Nm and max speed of 4000 rpm. I havent found any solutions or manufacturers who...
  5. magnusrm

    Steel quality for underwater propeller axles

    Hi. Im making a electric thruster for underwater applications (sea water). The propeller axle goes through a radial rubber seal from the internally oil filled casing. Ive previously used super duplex / duplex steel (EN 1.4410 / ASTM UNS S32750, EN 1.4460 / AISI 329 or EN 1.4462). The 316 SS...
  6. magnusrm

    PM motor stator design

    Hi guys. Im working on a project to make a new DC underwater thuster where we are making the stator / rotor ourselves. As im a mechanical engineer, this is not my field of expertise and my customer prefers just to try out the mechanical concept before we spend money on el-mag optimizations. As...
  7. magnusrm

    Analysing a scissor lift table in Siemens NX 9

    Hello guys. Im making a scissor lift table and struggle abit with the FEA. I have never tried this kind of coupled mechanism analysis before, so have patience. I have tried several different methods of coupling the two parts trough center holes where it will have an axle / bolt. There is also a...
  8. magnusrm

    Analysing a scissor lift table in NX 9

    Hello guys. Im making a scissor lift table and struggle abit with the FEA. I have never tried this kind of coupled mechanism analysis before, so have patience. I have tried several different methods of coupling the two parts trough center holes where it will have an axle / bolt. There is also a...
  9. magnusrm

    Error: An operation was attempted on an invalid or unsuitable OM object

    I have encountered the error "An operation was attempted on an invalid or unsuitable OM object" two times lately, where nothing can be done (no saving, changing etc). The error message just comes back as fast as I have pressed "OK". The issue occurs on a simplified FEA model, when I have made...
  10. magnusrm

    Mesh mating sheet bodies?

    Hi. Im running a simplified frame FEA, made with sheet bodies and thinshell 2D mesh. The beam is supported on shims, and in order to use the shim area for the constraint I have split the body. The whole beam, including the split bodies, is meshed in the same mesh. The beam is loaded, and only...
  11. magnusrm

    NX 8.5 64 bit not utilizing the CPU while doing FEA

    Hi. When i do FEA (like topology optimization), NX is only using 10-13% of CPU. Are there any settings to allow it to use more? I have a 1month old PC withj win 7 and Intel i7 quad core CPU. Thanks
  12. magnusrm

    Allowable displacement boundary condition

    Hi. Im currently modeling a crossbow in Abaqus, and im new to this application, so I need some help with the BCs. How do you create a boundary condition that allows a certain displacement in a certain direction? I can only find a fixed boundary condition in the Load module. I want to allow for...
  13. magnusrm

    Variable hole size on cylinder

    I use NX6 to make a cylinder with a large amount of variable holes. After reading thread561-296588 i am able to create a series of 90 points on my cylinder. However the points does not show up in the "Part navigator". I have created some holes by manually selecting each point, but the problem is...
  14. magnusrm

    NX6: Holes in a cylinder

    Hi, im struggeling with the following problem. I have a cylinder that i want to drill a series of holes in. The problem is that the number of holes are allmost hundred, and the holes have different diamter and positions on the z axis. To keep the stress consentration down i want the holes as...
  15. magnusrm

    Tolerance on a conical cylinder

    Hi. Are the tolerances different when making a conical cylinder in comparison to making a right (Straight) cylinder on a CNC lathe? thank you.
  16. magnusrm

    Low loss water check valve

    Hi, i need a low loss check valve that can withstand pressures up to 100 BAR for use in seawater. Do you have any tips to a product serie i should have a look at? The pressure drop should be minimal and the waterflow is about 1200-2400 l/min, but i can use more than one valve.
  17. magnusrm

    Check Analysis Quality out of memory

    When i have done a simulation, i press "Check Analysis Quality", but i run out of memory. Is there any setting that allows NX to use more RAM? My computer has 4GB RAM, but XP only uses 2.7GB. When i press solve, i can go to "Solver Parameters" and under "Nastran command keywords" there is a...

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