Where to write the "PID" parameters for Aerobrake?

[rocketman768]

Where do you write these and how do you guess the correct values for your ship? For many of my ships, aerobrake does a terrible job when the AoA or bank autopilot is engaged, and the ship gets into bigger and bigger oscillations (especially when there is little dynamic pressure).

 

[rocketman768]

Ok, found them in Modules\Plugin\<shipname>.ld

Any tips on how to go about messing with the parameters?

 

[C3PO]

This should be usefull. (I havn't checked, but it should )
http://en.wikipedia.org/wiki/PID_controller

 

[Poscik]

Where do you write these and how do you guess the correct values for your ship? For many of my ships, aerobrake does a terrible job when the AoA or bank autopilot is engaged, and the ship gets into bigger and bigger oscillations (especially when there is little dynamic pressure).

When you engage AoA autopilot, you have to engage Kill Rot. It keeps ship stable. Sometimes Kill Rot can disengage itself, then you have to engage it once again When you enter more dense atmosphere layer, Kill Rot shouldn't disengage. I'm using this method do make Shuttle stable when I'm not using AutoFCS. Generally I'm using AFCS to make the deorbit burn Rest of re-entry I'm doing with AerobrakeMFD and MapMFD.

 

[rocketman768]

When you engage AoA autopilot, you have to engage Kill Rot. It keeps ship stable. Sometimes Kill Rot can disengage itself, then you have to engage it once again When you enter more dense atmosphere layer, Kill Rot shouldn't disengage. I'm using this method do make Shuttle stable when I'm not using AutoFCS. Generally I'm using AFCS to make the deorbit burn Rest of re-entry I'm doing with AerobrakeMFD and MapMFD.

Thanks, but this seems like a very crude solution.

I actually broke out my differential equations book and started solving this problem with a PD system instead of the full PID system. I basically figured out how to tune the PID parameters via the "manual method" just before C3PO made his post.

If you are looking for the PID parameters for the Shuttle Fleet's shuttle that make the AoA pilot stable, these work very well for me:

AOA RCS P -62.0
AOA RCS I -5.0
AOA RCS D -60.0
AOA ELEV P -200.0
AOA ELEV I -10.0
AOA ELEV D -3000.0