Opposing rotational motion

[asaw]

Hi all! I am looking to design and build a device that resists rotational motion.
I am thinking about some sort of damper, like a dashpot, but focused on opposing angular motion. Any thoughts or currently-existing devices I can look to?

 

[gruntguru]

You haven't given us much information (angle limits, speed, energy dissipation etc). Existing devices include:
- a wide range of friction brakes (disc, drum, prony etc)
- numerous electrical devices (eddy-current brakes, generators etc)
- hydraulic brakes (positve diplacement, dynamic or viscous)
- various "air stirring" devices, club propellors etc.

You mention dampers so I assume you want a rising rate and low (or zero) torque at zero velocity. Some door closers use hydraulic dashpots butangular range is less than 180*.

je suis charlie

 

[asaw]

Thanks for the response! I'd like for the device to allow unconstrained motion under normal conditions, and I want it to begin opposing motion above a certain threshold angular velocity/acceleration. For example, it should oppose motion above an input angular velocity of 30 rad/s (just an example).

 

[GregLocock]

Sounds like a centrifugal clutch.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

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[BUGGAR]

Or a lever action shock absorber, like on the front end of a 1950 Oldsmobile?

 

[rb1957]

available space ? available systems ?

do you want to bet this'll be another "twenty questions" thread, with vital information relayed in about the 19th question ?

another day in paradise, or is paradise one day closer ?

 

[3DDave]

Is it larger than a bread box?

 

[MintJulep]

Like a rotary damper.

 

[IRstuff]

What is causing the rotational motion?

TTFN
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[btrueblood]

Opposed to rotary motion? I would stand on street corners with a sign saying "Go Straight!"

 

[IRstuff]

Yeah, "Down with Spin Classes!"

TTFN
I can do absolutely anything. I'm an expert!
homework forum: //

http://www.engineering.com/AskForum/aff/32.aspx

faq731-376 forum1529

 

[BUGGAR]

An anti-twerking device?

 

[btrueblood]

I'm probably on a list at the local Rotary club now...