Manuel Metz
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25kg delta UAV starts oscillating during descent

Started this discussion. Last reply by george Apr 2, 2013. 7 Replies

HelloI made around 30 flights with a delta wing uav with a weight about 25kg. APM 2.5 fm 2.68So the plane was tuned at about 30m/s in horizontal cruise flight.So when i start descent from waypoint…Continue

 

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Manuel Metz replied to Andrew Tridgell's discussion ArduPlane 2.71 released
"Hello Andrew When are you expecting to release Arduplane 2.72? Really want to check out the L1 Nav-Controller on our 30kg Jet UAV. Best regards Manuel"
Apr 24, 2013
george replied to Manuel Metz's discussion 25kg delta UAV starts oscillating during descent
"What's needed is gain scheduling. Attopilot had this years ago."
Apr 2, 2013
Tim McPherson replied to Manuel Metz's discussion 25kg delta UAV starts oscillating during descent
"Hi Manuel, Your aircraft and launcher are superb! If you have a link to it being launched or flying, it would be greatly appreciated. Is it constructed of foam and, are those slick/slender wings causing your oscillations at high speed?"
Apr 1, 2013
Manuel Metz replied to Manuel Metz's discussion 25kg delta UAV starts oscillating during descent
"i attached a picture here"
Apr 1, 2013

Developer
John Arne Birkeland replied to Manuel Metz's discussion 25kg delta UAV starts oscillating during descent
"We don't have much information about you UAV except that is must be big and heavy. The oscillation can just as well be a mechanical problem with wing flutter caused by excessive airspeed. If so no amount of PID tuning will prevent this, and you…"
Apr 1, 2013
Søren Kuula replied to Manuel Metz's discussion 25kg delta UAV starts oscillating during descent
"Hi, That's pretty interesting. So the effect of a control is (about) proportional to the square of the airspeed? Try change it! I suppose you could find critical P values at 3 different airspeeds and that should give you all you need to…"
Apr 1, 2013
Manuel Metz replied to Manuel Metz's discussion 25kg delta UAV starts oscillating during descent
"Hey Tim Thank you for your repley. I did that already. I saw in the code there is a airspeed scaler. but the gains should be corrected with differential airpressure ant not air speed. differential air pressure or even airspeedˆ2. What are you…"
Apr 1, 2013
Tim McPherson replied to Manuel Metz's discussion 25kg delta UAV starts oscillating during descent
"What do you mean by oscillating with respect to your aircraft? If you mean roll or pitch oscillations then try reducing the corresponding Proportional gains a bit to make it less sensitive at higher air speeds."
Apr 1, 2013
Manuel Metz posted a discussion

25kg delta UAV starts oscillating during descent

HelloI made around 30 flights with a delta wing uav with a weight about 25kg. APM 2.5 fm 2.68So the plane was tuned at about 30m/s in horizontal cruise flight.So when i start descent from waypoint one to waypoint to- distance between waypoint one around 1500m and a change of alt about 300mthe airspeed overshoots and the plane starts oscillating. Even when i turn the airspeed pitch PID to zero.What i figured out is that the plane gets to fast during descent even when the engine is almost…See More
Apr 1, 2013

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UAV operator at zhaw
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uav and automatic systems

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