Motorized Rotating Chair for Human Balance Studies

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Thread Starter

Allie

I need to build a motorized rotating (roll plane) chair for a vertical perception/balance study. I need it to be powerful enough to manage the weight
of the subjects and rotate 40-50 degrees/s. Any suggestions?
 
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Steve Myres, PE

Mount the chair on a base frame, connected to the outside world by trunnions mounted on a line throught the center of gravity of the person/chair combination. Then the only motor load will be the wr-squared load to accel and decel the chair. You will need about a 200-250:1 gear reduction for a 1750 rpm motor. Put an encoder on the chair trunnion and feed back to a motion control card in a PC, to provide motion profiles. Hope this helps.
 
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Cameron Anderson

This may be a bit overkill...look at Emerson Control Techniques Flex-i-dex with a servo. I belive the load rating is like 2000lbs. Cost pry $8K for complete system.

Cameron Anderson
Motion Control Specialist
Power/mation - St. Paul, MN
 
K
In January 1990 I visited Lulea University in Sweden, there I saw just such a device you describe. I believe they were doing a study into sea sickness/ motion sickness. They paid students to sit in the chair whilst they applied applied various roll/yaw & rise/fall waveforms to the chair. The equipment was at least three axis servo hydraulic. Perhaps they've finished with it & you could make them an offer? No harm in trying!
Sorry for the sarcy remark! Ken :)
 
Hi - I'm interested in this device - has there been any other threads on this? Anyone know if it's still in Sweden.

Thanks - rather belated message but you never know

> In January 1990 I visited Lulea University in Sweden, there I saw just such a device you describe. I believe
> they were doing a study into sea sickness/ motion sickness. They paid students to sit in the chair whilst they
> applied applied various roll/yaw & rise/fall waveforms to the chair. The equipment was at least three axis servo
> hydraulic. Perhaps they've finished with it & you could make them an offer? No harm in trying!
 
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