[AR] Re: Successful liquid launch at FAR
- From: Matthew JL <prmattjl@xxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Tue, 25 Jan 2022 17:15:27 -0500
plus pitch and yaw
control-surface angles simply set directly proportional to pointing error.
So that would be something like 5 degrees of error = 5 degrees of
deflection in the opposite direction?
On Tue, Jan 25, 2022 at 12:20 PM Henry Spencer <hspencer@xxxxxxxxxxxxx>
wrote:
On Mon, 24 Jan 2022, Robert Watzlavick wrote:
The plan is to add active stability control to the existing rocket
(using movable control surfaces, not gimbaling)... That may take me a
while though. I'm a bit challenged in linear algebra and control theory
so I'll have to dust off the textbooks for this effort.
You might not need very much, if you use one of the MEMS IMUs that Troy
mentioned, which can directly report angles. The early Sidewinders were
very successful with the most boneheaded control approach imaginable: no
active roll control (rollerons for roll damping), plus pitch and yaw
control-surface angles simply set directly proportional to pointing error.
(I expect there was a bit of filtering of the pointing-error signal.)
Guys who'd spent years sweating over control design for other AAMs were
astonished that something so crude worked so well.
Henry
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