I Have inserted the starting pass at a much needed section on Vibration Control in the ArduCopter Wiki and would very much like feedback for corrections or additions from you all.
This is the close coupled mount that I use on my little F330 Flamewheel.
To achieve this plus and minus one tenth G vibration dampening.
In any case, please review the Vibration Control Wiki section under Assembly and give me some (constructive) feedback.
Thank You,
Gary McCray
Comments
Jason....I think that would be the best solution. All the hardware are already in place for all who own an APM. I assume it should work for the props too once to motors are balanced.
I was thinking of writing a simple motor balancing CLI test. Basically it would run a particular motor at certain speeds for 5 seconds then spit out a score. Move your tape around the motor until the score drops and you've got a balanced motor. It would use the accels from the APM so it should be fairly accurate and practical since you wouldn't need to unmount your motors. Just your props.
Jason
1) Consider putting prop balancing first along with details on how to do it. That's a pretty simple way to reduce a lot of vibration.
2) What is a good motor balance procedure? I am not familiar with this.
Does anyone have good theories on where most of the vibration comes from to begin with? Props? Motors? Turbulence? Natural frequency of various frames? Frame material might play a large part in vibration.
Mike
There was recently a posting that talked about how we are overdoing the amount of dampening material. Or better yet; not taking full potential of thier properties.
I think we need something simple, like we coat the inside of the APM2.5+ Case with vibration dampening material such as this...
Silent Running stops unwanted noise and vibration.
Thereby not needing external vibration dampening; or mountings that can lead to loss of "visibility" to the sensors.
Thoughts?
Hi Again Josh,
I Googled Moon Gel and definitely would like to know your results with it, looks like a really exotic substance, and should be interesting.
Hi Max,
I had already looked at your O-ring mount Blog (excellent pictures by the way).
It is quite similar to the way that my F450 FlameWheel is mounted.
I discovered that a much shorter coupled (Board closer to the standoffs) method worked noticeably better.
It permits less initial O-ring tension while rapidly increasing tension and dampening with the smallest possible board movement it also prevents unnecessary board tilt or motion.
That said, this is the traditional O-ring suspension method and it certainly provides results sufficient for inertial navigation.
Just close coupling works better.
I am going to be ordering a bunch of assorted 1/16" Silicone O-rings soon in assorted diameters and they should work better than the Buna-N ones for dampening as well.
Hi Josh,
Good question.
The most important circumstance we need to get flight log vibration information from is a stable hover.
For camera use generally a Multicopter is not flown acrobatically and so the flying G forces are pretty light and vibration information from a hover will suffice.
However, for all out acrobatic or high speed maneuvering flight the G forces placed on the copter might exceed the relatively benign conditions encountered in a hover.
If this is the case you might want to produce a flight log which incorporates flying to this extreme envelope and then analyze the vibrations at that point in the flight where the copter was subjected to those extreme maneuvers.
Hi Randy,
I do know that concise is not my strong point.
I fully agree with and respect your comment though and will work at it.
In the meantime, I agree completely about the 80 percent of the people reading the first half page or so and will reorganize it as you suggest.
I'll move the Quick Fix stuff to the top with the pictures and put the Log walk through Immediately under it, then the rest of the more theoretical and development oriented stuff after that for those who want to go all out.
I was already planning to provide links to specific material sources and information, but I will kick it up a notch on my to do list.
I was looking for some good tips for my current build, good timing and thanks for starting a one-stop shop for vibration elimination tips.
the content looks pretty good but a couple of suggestions on layout:
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