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HomeAircraftHelicopterFlybarless Rotor Head SystemsOther › Flybarless Controller Latency Testing
02-20-2013 08:16 PM  5 years agoPost 41
JKos

rrProfessor

Redondo Beach, CA

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FS,
My use of MATLAB for the purposes of this testing is really of no significance. I use MATLAB because I know it well and have been using it for all types of personal and professional projects since '93. That's all.

- John

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02-20-2013 10:07 PM  5 years agoPost 42
Four Stroker

rrElite Veteran

Atlanta

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They give it away to students. Then the company that hires them buys it because they already know how to use it. I have had to use it a lot. It's OK. Very expensive!

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02-21-2013 12:29 AM  5 years agoPost 43
Greg Faust

rrApprentice

Northern VA, USA

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JKos, thanks for your work here and on the radio and servos.

Would it be worth mounting a FBL controller to a servo horn and using your micro controller to move the servo. This would enable the measurement between the time of perceived (unwanted) movement, and the reaction time? I would assume this could be performed for all 3 axes.

Bonus would be to graph the FBL response to various magnitude and speed of unwanted movement.

I guess it would be tricky to graph the output of the control loop of various FBL controllers. Maybe a graph with the positive side of the sale representing the output and the negative side representing the unwanted movement.

Can any of you electrical engineers think of a better way to graph this?

<<<Lithium Field Rep>>>

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02-21-2013 02:56 AM  5 years agoPost 44
F1 Rocket

rrKey Veteran

Melbourne, Florida USA

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Why not just mount the FBL controller in your heli and see how big a grin you have while flying it. Isn't this what really matters in the end

Danny - DemonAero Support Team

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02-21-2013 03:16 AM  5 years agoPost 45
Greg Faust

rrApprentice

Northern VA, USA

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I like to calculate exactly how much fun I am having

<<<Lithium Field Rep>>>

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02-21-2013 03:26 AM  5 years agoPost 46
AWittleWabbit

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O.C., CA

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Can any of you electrical engineers think of a better way to graph this?
I'm not a EE but you would run a frequency response test. To do it right, the output (servos) would need a representative load on them while doing so. The input would be the fbl controller being moved. I imagine the fbl controller gains would have to be tinkered with so you would have to run the test many times.

Heli-itis sufferer.

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02-21-2013 03:44 AM  5 years agoPost 47
F1 Rocket

rrKey Veteran

Melbourne, Florida USA

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I like to calculate exactly how much fun I am having
Fair enough. Everyone needs a hobby. Mine is flying as much as I can

Danny - DemonAero Support Team

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02-21-2013 05:17 AM  5 years agoPost 48
BobOD

rrElite Veteran

New York- USA

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Why not just mount the FBL controller in your heli and see how big a grin you have while flying it. Isn't this what really matters in the end
It's cold, windy and dark out at the moment.
On a more serious note, I like to make my purchases based on performance specifications as much as possible. That may not be for everyone, but it has served me quite well. I learned a long time ago that good marketing and "persistently satisfied owners" working in concert could sell you a turd and convince you it's putting a smile on your face.

Team POP Secret

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02-21-2013 06:54 AM  5 years agoPost 49
GetToDaChopper

rrElite Veteran

Las Vegas , NV

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and convince you it's putting a smile on your face
but the reality is your not really happy with it even though you're smiling but you just can't admit it to yourself because you spent so much money on it and all the pros say it great so you think it must be something i'm doing or not doing......

    ▲
  ▲ ▲
▲ ▲ ▲ One of a Kind !!!

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02-21-2013 12:49 PM  5 years agoPost 50
rexxigpilot

rrProfessor

Florida

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but the reality is your not really happy with it even though you're smiling but you just can't admit it to yourself because you spent so much money on it and all the pros say it great so you think it must be something i'm doing or not doing......
I believe we call that a sh1+ eating grin, not a smile.

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02-21-2013 02:31 PM  5 years agoPost 51
Four Stroker

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Atlanta

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I suspect that John does not have a four axis Contraves Goerz rate table OR a real time simulation of the response of a FBL heli 500/600/700. The control loop response crap you guys are talking is out of scope. John is doing exactly the same calculation as on the other thread. The main goal of this thread is to see if distributing the processing from the TX to the FBL box introduces more latency. Also the CCPM calculations still have to be done in the FBL box. Do some brands use a cheap processor that introduces latency ? There is a hell of a difference in a $2 and $20 processor these days.

Questions like "what does boost do ?" are just a bonus.

I am curious what the manufacturers of FBL have as tools ?

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02-21-2013 03:25 PM  5 years agoPost 52
Ronald Thomas

rrMaster

Gainesville, Fl, USA

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Admittedly I know almost nothing about what this testing is doing but I do I know in order for a true test and analysis to be done, all things have to be considered if they are in the chain of the test. If there were some way to take the control loop out of the equation, I am sure you could get a good test but with that being said, when you add the control loop back into the system, it may make the overall performance of the unit different then what the "numbers" say....which is the point I think MrMel was trying to make.
Looking forward to seeing what gives.....Ron

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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02-21-2013 08:59 PM  5 years agoPost 53
AWittleWabbit

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O.C., CA

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The control loop response crap you guys are talking is out of scope.
Fourstroker,

Can't someone talk about something without your approval? If John has a problem with the extra discussion I would gladly stop.

I think we can all agree FBL introduces some new things to this testing. What John can/wants to test is up to him.

Heli-itis sufferer.

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02-21-2013 10:15 PM  5 years agoPost 54
BobOD

rrElite Veteran

New York- USA

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As noted above, doing this for collective (as John has) is a wise start as it's not in a control loop. No need to take it out if it's not in one.
Where I think it might get interesting is with more advanced gyros that can put collective in a control loop. Gyros that have accelerometers or GPS for example. This could make the results more complicated to interpret. That doesn't mean something couldn't be gleened from the information though.

Team POP Secret

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02-22-2013 01:11 AM  5 years agoPost 55
rexxigpilot

rrProfessor

Florida

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Correct BobOD. I was going to post about that too. Many of the newer FBL systems use accelerometers in addition to the gyro sensors. The collective is within a control loop is this case.

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02-22-2013 01:32 AM  5 years agoPost 56
Ronald Thomas

rrMaster

Gainesville, Fl, USA

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Correct BobOD. I was going to post about that too. Many of the newer FBL systems use accelerometers in addition to the gyro sensors. The collective is within a control loop is this case.
That is what I thought as well but I was not positive so I did not post.

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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