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Question about 3-axis gimbal
Hi there
I have recently come across the idea of a 3-axis gimbal to keep an object (mounted in the innermost ring) horizontal regardless of the motion of the support (on which the outermost ring is pivoted). I understand that the 3-axis (3-rings, with the outermost ring pivoted on the support that is prone to rotation) gimbal would prevent rotation about 3 mutually-perpendicualr axes (let's call them x, y and z). But what if the support (on which the outermost ring is pivoted) rotates about an axis that is at an angle to all of of these 3 mutually-perpendicular axes, ie lets' say at an angle of 30deg to x, y and z axes? Since the 3 rings are designed to prevent rotation of the object ONLY if the support rotates about one of the 3 perpendicualr axes, how will object behave if the support rotated abiut any other arbitrary axes? Your comment will be appreciated. Thanks |
#2
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Question about 3-axis gimbal
"Ady" wrote:
But what if the support (on which the outermost ring is pivoted) rotates about an axis that is at an angle to all of of these 3 mutually-perpendicular axes, ie lets' say at an angle of 30deg to x, y and z axes? Since the 3 rings are designed to prevent rotation of the object ONLY if the support rotates about one of the 3 perpendicualr axes, how will object behave if the support rotated abiut any other arbitrary axes? Each gimbal rotates to take out the portion of the rotation in it's plane. This is a long solved problem. D. -- Touch-twice life. Eat. Drink. Laugh. -Resolved: To be more temperate in my postings. Oct 5th, 2004 JDL |
#3
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Question about 3-axis gimbal
On Feb 15, 5:34 pm, (Derek Lyons) wrote:
"Ady" wrote: But what if the support (on which the outermost ring is pivoted) rotates about an axis that is at an angle to all of of these 3 mutually-perpendicular axes, ie lets' say at an angle of 30deg to x, y and z axes? Since the 3 rings are designed to prevent rotation of the object ONLY if the support rotates about one of the 3 perpendicualr axes, how will object behave if the support rotated abiut any other arbitrary axes? Each gimbal rotates to take out the portion of the rotation in it's plane. This is a long solved problem. D. -- Touch-twice life. Eat. Drink. Laugh. -Resolved: To be more temperate in my postings. Oct 5th, 2004 JDL Thank you Derek for your reply. A further clarification - I am new to gimbal design. I would like to learn more about the actual design and principles of how to prevent rotation of the object in the centre. - do you know of any references which give more info on detailed design/theory/analysis of this subject? Internet links tend to define and give a small description only. - how can I design the pivots if I want to prevent rotation only about all the possible axes that lie in one plane let's say x-y plane? Thanks again |
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