Home
Help
Search
Login
Register
Oscillation on descent. Need help with PIDS :(
LibrePilot Forum
General Category
General Discussion
Oscillation on descent. Need help with PIDS :(
« previous
next »
Print
Pages: [
1
]
Brugghh
3
Oscillation on descent. Need help with PIDS :(
«
on:
April 09, 2017, 10:40:26 pm »
Hey, recently my quad had just started to oscillate a little bit when i'm descending. I posted a pic of my current pids, what would i need to change about to maybe stop the oscillation?
Logged
utoedter
170
Re: Oscillation on descent. Need help with PIDS :(
«
Reply #1 on:
April 10, 2017, 06:50:32 am »
Do you have these oscillations if you descent non vertically? Often they are caused by flying trough the props turbulences.
Udo
Gesendet von iPhone mit Tapatalk Pro
Logged
Mateusz
808
Re: Oscillation on descent. Need help with PIDS :(
«
Reply #2 on:
April 10, 2017, 07:47:24 am »
If your copter has a narrow range of optimal PIDs it may oscillate when descending (low throttle) or asscending (high throttle). There is option TPS (throttle PID scaling) which I use on my bigger copter 450mm.
Logged
TheOtherCliff
4304
Re: Oscillation on descent. Need help with PIDS :(
«
Reply #3 on:
April 10, 2017, 05:47:33 pm »
As mentioned, TPS definitely helps this. You get to decide how much to increase the PIDs at lower throttle. Another thing that helps a lot if you have a Revo class FC is to run AutoTune.
This is a problem even for full sized helicopters. You get in your own turbulent downwash when you drop straight down in a certain speed range. Come down slower (or faster
) or come down at an angle (say 45 degrees).
Logged
Dashz
3
Re: Oscillation on descent. Need help with PIDS :(
«
Reply #4 on:
April 12, 2017, 09:48:40 pm »
Like @theOtherCliff said, this happens to bigger quadcopters and tbh, it happens to any quadcopter even to the Top-notch or the best racing 250 quads with insanely high Pid Loops and Gyro frequencies plus best hardware.
Logged
Print
Pages: [
1
]
« previous
next »