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  • Users: IceMan30
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  1. IceMan30

    Standard/guide for vacuum test for a presure vessel?

    Can anyone out there direct me to a standard or guide regarding preferred methods for testing pressure vessels? (AIAA, AMSE, NIST, Whatever Association of Pipe-Fitters and Pressure Vessel Experts, etc.) I've read plenty of anecdotal evidence, and intuitively understand how a vacuum test should...
  2. IceMan30

    Vacuum Leak Test - gauge and rate?

    I am trying to set up a vacuum leak test. I want to apply a vacuum to an assembled panel we produce(~1'x1'x1.5" thick, very little internal space, basically just the space between internal components and outer bezel), then lock the vacuum and measure decay over time. I am thinking ~15-30 mm HG...
  3. IceMan30

    Wind tunnel in iPhone 11 commercial?

    Hey everyone, I’m trying to figure out what wind tunnel is featured in the recent iPhone 11 commercials. Any thoughts? It’s obviously a low speed, likely research-based facility. Really not sure if it’s a private or government facility. What do you guys think? :)
  4. IceMan30

    compare coefficients/aero models

    I have two (2) sets of drag coefficients, purportedly for the same thing. These drag coefficients are used in separate aero models. I know a lot about one aero model, and very little about the other. One thing that stands out to me is that one model uses a constant gravity model, whereas the...
  5. IceMan30

    URGENT - LabVIEW network data read

    Hey All, So here's my problem: I need to read binary data over a closed wireless network into LabVIEW. I know (or will know) the IP address/Port # for where the data is coming from. This will be live, streaming binary data that I will then have to convert into an array or matrix or whatnot, in...
  6. IceMan30

    needs to solve system of 4 eqns, 4 unknowns

    Hello All, I what what I thought (once again!) was a fairly straight-forward problem to solve, but I can't quite seem to get there. I have 4 eqns, 4 unknowns. Equations are along the lines of: sqrt(x^2+y^2) + z + sqrt((val1-x)^2 + (y-val2)) + Const1 = 0 sqrt(x^2+y^2) + z + Const2 = 0...
  7. IceMan30

    read (input) file as real-time data

    Hopefully this one is easy. I think this should be a no-brainer, but I haven't used LV extensively in quite a while... :P I have a text file I want to read in to labview (I'm good there); but I want to read it in at, say, 200Hz, as if to simulate a real-time data stream. I'll be using my VI for...
  8. IceMan30

    system of equations - square root involved

    Hey Y'all, I'm a bit rusty, and could use some help in solving a system of equations. Let's say I have 2 equations, 2 unknowns (simplified for discussion's sake), and one of my equations looks something like: B1 = (const1)x1 + (const2)x2^2 + sqrt(x1-x2). Assuming I can't come up with a third...
  9. IceMan30

    microchip programming

    I'm working on a project where I'm programming an ARM microchip that acts as the "brains" on a custom board with other off-the-shelf components. In programming the ARM chip, you can program the other hardware components. Since I'm not overly experienced as a programmer, and not very familiar...
  10. IceMan30

    Toolbox directory in Mac OS X?

    Does anyone know where/how to access the Matlab Toolbox directory in Mac OS X? On a Windows machine (Win XP), its fairly straightforward: C:\Program Files\MATLAB\R2007a\toolbox. On OS X, I can't seem to find any such directory, even though I have a half-dozen toolboxes installed. I can't even...
  11. IceMan30

    Index of Refraction for Std ATM

    I'm trying to develop a table for Index of Refraction for standard atmosphere. So far I've found reference to the Ciddor and Edlen equations, but I'm having trouble finding the exact calculations and what goes into them. Also, some of the references I've found mention of using the Ciddor...
  12. IceMan30

    Data conversion via Reynolds # - -comments?

    ***Apologies up front for the long, general nature of this post...*** I'm trying to solve an aero problem by converting drag data (Cd at given Mach #s) from a given source to a smaller scale. Somewhat specifically, I'm trying to transpose Cd data for a given rocket body to a smaller cylindrical...
  13. IceMan30

    Adding legend to Matlab figure...

    Really simple question... What's the trick to adding a legend to a matlab plot? I'm a pretty experienced Matlab user, just shaking the rust off after a couple years of little use. To cite the example in a Matlab manual (version 7, from early 2009 I think): >> x = 0:pi/200:2*pi; >> y = sin(x)...
  14. IceMan30

    square wave with Gibbs phenomenon

    I'm trying to create a square wave that accounts for the Gibbs phenomenon (the overshoot that occurs when a square wave changes direction). Specifically, I want to add overshoot at just the leading edge of a rise or fall. Square waves are easy - manually or via function 'square'. I can also do...
  15. IceMan30

    Drag data on bullet shell

    I'm looking for data/info on the trajectory of spent shells/casings after firing a bullet. Drag coefficients/ factors, trajectory data, etc. Any help is appreciated! Keywords: bullet round shell case cartridge drag factor coefficient

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