Jump to content
Sign in to follow this  
gmamo

Innovative Gyro stabilization

Recommended Posts

By visiting a couple of fora, and viewing videos of helis doing 3D,

one can arrive to a conclusion that the new breed of SMM gyros are bloody

good... namely the GY-401 and all the above specd gyros. You can see them doing

full power climbouts, and tail first backwards maneuvers, and the tail

never seems to sway. This is a combination of a powerful Tailrotor, a good

gyro and a fast tail servo.

Here comes the interesting bit:

If I were to have a 3 axis camera mount or gymbal and mount 3 complete tail rotor assemblies( all with a small brushless motor driving the Tailrotor through a belt ( or whatever), with a fast servo and a good gyro matched to the system) in an XYZ fashion, each one controling roll, pan and tilt, you could have the full potential of the current gyro technology. I would for now, remove the effect of

downdraught caused by the main rotor of a model helicopter... although I

think it is irrelevant considering how 3d helis perfectly control

backwards and sideways flight.

This arrangement would provide the benefits of having a very strong and

very fast lock on a heading ( just like a 3d heli ) with the camera

remaining pointed at infinity.... all this if there is no physical

restraint from the heli carrier itself...ie.. the gimbals should be

totally allowed to pivot freely.

Do you like this ??? I think it'll work nicely

Now for the next step.

IF you, an extrovert PIC expert ;-) , can build a PIC project ... an emulator for

a tail rotor system...

That is... A tail rotor IMHO is a constant power applied to a propellor

with a variable pitch mounted on a tail boom. when the gyro senses even a

small movement, you can see that the fast servo moves a large amount at

first, the tail rotor pitch increases/decreases, the tail starts moving

( here we have some inertia, when the tail is approaching the new heading

the tail servo goes to slightly negative value of the previous amount to

stop the tail inertia from moving bringing a sudden dampened stop to the

system. It's very hard to explain in words what seems clear in my mind :(

If one can manage to either design a new gyro, to reprogram a gyro pic to tune the PID loop to a camera gimbal, or else insert a PIC to mimic the tail responce, on can place the gyro on the actual axis that is being actuated by the gyro

itself for a closed loop performance .... ( just like on a heli, but now without the three tail rotors stickling out :)

I don't know if you have tried to experiment with gyros placed on the actual

actuated axis... there is a severe positive oscillation which ruins the

stabilization if the gain is turned up so that some stabilization starts to happen.

My experiments have only worked to a limited satisfaction,

only if the gyro is mounted outside the actuated axis (ie.. mechanically, one step axis up from the actuated axis itself ... if you know what i mean !! )

Any comments about this idea ? Any PIC experts wanna do a Tail dynamics emulator ?

George from sunny Malta !!

post-6-1070009073_thumb.jpg

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×