Thread: Bridge Mass Properties
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Unread 23-06-2002, 23:02
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Bridge Mass Properties
Posted by Dodd Stacy at 1/16/2001 12:02 AM EST


Engineer on team #95, Lebanon Robotics Team, from Lebanon High School and CRREL/CREARE.



We measured our bridge properties, and here is what we found, for those teams who are taking a mathematical approach to their design effort. Our bridge weighs 214 lbf, including the weights but not including the sexy aluminum diamond side plates (not our style), and we hadn't yet put on the two steel lip plates at the bridge ends. More important, we measure the bridge CG height - including the weights - at about 6" above the top of the bridge deck.

The measurement technique involved balancing the bridge on the end lip and measuring the small angle of the deck from vertical with a level and protractor, so the error may be significant, but there it is for what it's worth. Put your robot weight and its CG height into play with an inverted pendulum, and see how fast the system will pitch forward and how fast you have to correct your position, if your robot wants to balance on the bridge. Good luck, all.

Dodd


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