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  1. IceMan30

    Standard/guide for vacuum test for a presure vessel?

    r6155 - Thanks! Ed - I believe the answer to your question is "general vacuum test." We are applying vacuum, closing a valve and shutting off vacuum. Data is vacuum loss (pressure rise) over time.
  2. 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...
  3. IceMan30

    Vacuum Leak Test - gauge and rate?

    Thank you all for your replies! Some responses and perhaps better insights: - These parts are currently tested via a positive pressure "bubble test," somewhat as described by CompositePro. We have a requirement to perform some sort of seal check, and this has been the method for some time...
  4. IceMan30

    Designing for Wind Tunnel Test Section Velocity

    Apologies up front if I missed something in the other replies... You can certainly use Bernoulli and other similar simplifications(VA_1 = VA_2) for a low speed setup like that. If you're going that route, you could also calculate for a top end around 60mph, and your losses will put you in the...
  5. 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...
  6. 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? :)
  7. 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...
  8. 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...
  9. IceMan30

    needs to solve system of 4 eqns, 4 unknowns

    FeX32, My bad, I mis-entered the equations in first post sqrt(x^2+y^2) + t + sqrt((val1-x)^2 + (y-val2)) + Const1 = 0 sqrt(x^2+y^2) + t + Const2 = 0 sqrt(x^2+y^2) + t + 3*sqrt((x-val3)^2 + (z-val3)) + Const3 = 0 sqrt(x^2+y^2) + t + 2*sqrt((val4-y)^2 + (z-val2)) + Const4 = 0 x, y, z, and...
  10. 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...
  11. 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...
  12. IceMan30

    system of equations - square root involved

    Thanks Brad. I think fzero, or another built-in optimization function, may be what I'm looking for. The pieces are slowly starting to fall back into place.. :) Thanks to all.
  13. IceMan30

    system of equations - square root involved

    Excellent suggestions...except that I'm on Matlab R2007a, and I only have the Image Processing and Signal Processing toolboxes. That doesn't mean I can't get Optimization or others, but I'm trying to make due with what I have at my disposal. Very frustrating, as I can...almost...remember...what...
  14. 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...
  15. IceMan30

    microchip programming

    Some good thoughts to chew on...thanks guys!
  16. IceMan30

    microchip programming

    Allow me to clarify... Does anyone have any thoughts, suggestions, comments, etc as to the use and effectiveness of an RTOS for microchip circuits for high-speed timing? I was just trying to cast the proverbial "wider net" in regards to getting additional opinions and viewpoints. :)
  17. 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...
  18. IceMan30

    Toolbox directory in Mac OS X?

    Figures it out... On the surface (with OS X 10.6.7 and R2010aSV-student version), all I have under Applications is the Matlab Application itself. However, if I "Show Package Contents"...then I get the subcontent you must be seeing, which includes the toolbox folder. Tricky :P Side note - I...
  19. IceMan30

    Toolbox directory in Mac OS X?

    Huh...well that sounds easy enough - not sure how I missed it! I'll give that a try when I get home! Thanks! :)
  20. 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...

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