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Using LAbView for developing an avionics system.
Bodypilot
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11-15-2002 04:31 AM
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Hi there,
I�m thinking of using LabView to develop a pitot-tube system as a graduate project but, since I�ve never worked with LabView, wondered if this is possible.
Here�s what I plan to do:
A pitot-tube is basically a tube somewhere on an aircraft used to record static- and dynamic pressure. Airspeed, current altitude and rate of climb/descent can be derived from these pressure readings.
The plan is to link two pressure sensors (one to record static pressure and the other to record dynamic pressure) to a LabView application. In addition to this a rotateble part of the system (not unlike a wind-vane) has to be fitted with a sensor, which can measure angles to record �angle of attack�.
Since this system will be used
by skydivers to measure the performance of parachutes it has to be small, lightweight, energy efficient (possibly run on a laptop battery?) and be able to store data either locally (preferred) or send data to a ground station via a data-link.
Questions:
1) Can LabView be used for this application and if so, what LabView modules should I consider?
2) Are the sensors mentioned above which are currently on the market small and energy efficient enough?
3) What hardware would you advice me to use?
4) How much would this hardware/system cost?
5) Should the LabView application used to collect the data be an *.exe running on some kind of portable computer on can I use an EPROM for that?
6) Can someone who�s not particular good at the �conventional� control systems engineering (i.e. MatLAb, Simulink, Laplace-transforms and modeling in the frequency domain) build this system or is this kind of knowledge a prerequisite to using LabView to build this system?
I�m really interested in lear
ning to use LabView so any respond is welcomed,
Gerjo
The Netherlands.
I�m thinking of using LabView to develop a pitot-tube system as a graduate project but, since I�ve never worked with LabView, wondered if this is possible.
Here�s what I plan to do:
A pitot-tube is basically a tube somewhere on an aircraft used to record static- and dynamic pressure. Airspeed, current altitude and rate of climb/descent can be derived from these pressure readings.
The plan is to link two pressure sensors (one to record static pressure and the other to record dynamic pressure) to a LabView application. In addition to this a rotateble part of the system (not unlike a wind-vane) has to be fitted with a sensor, which can measure angles to record �angle of attack�.
Since this system will be used
by skydivers to measure the performance of parachutes it has to be small, lightweight, energy efficient (possibly run on a laptop battery?) and be able to store data either locally (preferred) or send data to a ground station via a data-link.
Questions:
1) Can LabView be used for this application and if so, what LabView modules should I consider?
2) Are the sensors mentioned above which are currently on the market small and energy efficient enough?
3) What hardware would you advice me to use?
4) How much would this hardware/system cost?
5) Should the LabView application used to collect the data be an *.exe running on some kind of portable computer on can I use an EPROM for that?
6) Can someone who�s not particular good at the �conventional� control systems engineering (i.e. MatLAb, Simulink, Laplace-transforms and modeling in the frequency domain) build this system or is this kind of knowledge a prerequisite to using LabView to build this system?
I�m really interested in lear
ning to use LabView so any respond is welcomed,
Gerjo
The Netherlands.
javi 328
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11-15-2002 12:03 PM
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A lot of good questions. I'll take a couple of them:
1.LabVIEW will measure anything so, yes it can be used. For something as portable as you are talking about, I believe you might be better off with something that is less of a hit in terms of what it needs to run. That said, if you go with some kind of open source, your development time will triple or worse. If you make a really lean VI and use the compiller, it may work. By lean I mean you will have to start one from scratch and not use any examples without modification. Strip them down.
5. I don't personally know of anyone running a VI on EPROM, but I'm sure someone will answer that question (I'm really interested too). If you decide to run it on a portable computer along with all the other things you men
tioned (wireless, etc) please make sure you are not running Windows. Don't get me wrong, windows is great for some things, but not for this type of application (in my opinion). I have developed apps that are run on Linux and Windows and the ones running on Linux always outperform and out last the windows ones.
6. Depending on your development schedule, you should be able to learn LabVIEW quickly. It is very intuitive and has pleanty of resources to go for help (like this one). It would also be 100% better than most of your alternatives.
Ok. My 2 cents.
Javi
1.LabVIEW will measure anything so, yes it can be used. For something as portable as you are talking about, I believe you might be better off with something that is less of a hit in terms of what it needs to run. That said, if you go with some kind of open source, your development time will triple or worse. If you make a really lean VI and use the compiller, it may work. By lean I mean you will have to start one from scratch and not use any examples without modification. Strip them down.
5. I don't personally know of anyone running a VI on EPROM, but I'm sure someone will answer that question (I'm really interested too). If you decide to run it on a portable computer along with all the other things you men
tioned (wireless, etc) please make sure you are not running Windows. Don't get me wrong, windows is great for some things, but not for this type of application (in my opinion). I have developed apps that are run on Linux and Windows and the ones running on Linux always outperform and out last the windows ones.
6. Depending on your development schedule, you should be able to learn LabVIEW quickly. It is very intuitive and has pleanty of resources to go for help (like this one). It would also be 100% better than most of your alternatives.
Ok. My 2 cents.
Javi
PdB
Active Participant
11-16-2002 03:24 AM
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I measured (well, did the programming) airspeed using pitot-tube with LabVIEW in chimneys(Corus). The sensors, tubes and convertors don't make it that compact.
I encourage you to look at alternatives, how about ultra-sound based air-speed sensors (they also detect the angle). And what about GPS? If you find a device that outputs data (or better internally logs) position data for a certain time at fast enough rate, you only need to post-process the data when you're on the ground.
Just some ideas.
Good luck,
Patrick de Boevere NL
I encourage you to look at alternatives, how about ultra-sound based air-speed sensors (they also detect the angle). And what about GPS? If you find a device that outputs data (or better internally logs) position data for a certain time at fast enough rate, you only need to post-process the data when you're on the ground.
Just some ideas.
Good luck,
Patrick de Boevere NL
