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Pressure versus Volume graph

  1. #1
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    Default Pressure versus Volume graph

    Hi Everyone,
     
    On my system i require a graph of pressure vs volume.
     
    I have tried merging the data from the my pressure transducer and my crank angle encoder (volume) but i end up with a graph showing the two different data streams.
     
    How can i alter the information so that it gives me a graph of pressure vs volume instead of pressure and volume vs time?
     
    I have struggled on this for a while now and i cant find a solution.
     
    Please help me!
     
    Alex
     
    :mansad:

  2. #2
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    Default Re: Pressure versus Volume graph

    You can use the XY graph instead of the normal Waveform graph.
    Vikas


    XY graph pallete.PNG:
    http://forums.ni.com/attachments/ni/170/304629/1/XY graph pallete.PNG

  3. #3
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    Default Re: Pressure versus Volume graph

    Hi Alex,
    can you show us the vi with the xy graph?
    Thanks
    Mike

  4. #4
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    Default Re: Pressure versus Volume graph

    Hi Mike,
     
    Here you are.
     
    Thanks
     
    Alex


    Transducer.vi:
    http://forums.ni.com/attachments/ni/.../Transducer.vi

  5. #5
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    Default Re: Pressure versus Volume graph

    Thanks Viskas,
    Can you put these into an earlier version of Labview? Ive only got 8.2!
    Thanks
    Alex

  6. #6
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    Default Re: Pressure versus Volume graph

    Hi Alex,
    I assume you are using the sinusoidal signals for experimentation. See the attached VIs - they should give you some idea of the usage.
    Vikas


    XY_Graph_sine_signals.vi:
    http://forums.ni.com/attachments/ni/...ine_signals.vi


    XY_Graph_Volume_Pressure_curve.vi:
    http://forums.ni.com/attachments/ni/...ssure_curve.vi

  7. #7
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    Default Re: Pressure versus Volume graph

    Hi Alex,
    here is your vi with some changes.
    MikeMessage Edited by MikeS81 on 02-29-2008 01:08 PM


    Transducer[1].vi:
    http://forums.ni.com/attachments/ni/...2/1/Transducer[1].vi

  8. #8
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    Default Re: Pressure versus Volume graph

    Hi Alex,
     
    Here are 8.2 versions..
     
    Vikas


    XY_Graph_sine_signals.vi:
    http://forums.ni.com/attachments/ni/...ine_signals.vi


    XY_Graph_Volume_Pressure_curve.vi:
    http://forums.ni.com/attachments/ni/...ssure_curve.vi

  9. #9
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    Default Re: Pressure versus Volume graph

    Thanks a lot Viskas,
    you've done me a huge favour there, the stress was beginning to become a permanent fixture!
    Cheers
    Alex

  10. #10
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    Default Re: Pressure versus Volume graph

    Mike thats brilliant. Thanks.
    I tried to get the data into the correct array/cluster forms for the XY graph but I just couldnt find the right ones.
    Thanks a lot.
    Alex

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