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Interesting Bridge Data
Posted by Dodd Stacy at 1/30/2001 8:58 PM EST
Engineer on team #95, Lebanon Robotics Team, from Lebanon High School and CRREL/CREARE. In Reply to: Bridge force chart Posted by Ken Leung on 1/26/2001 7:31 PM EST: : Here is what our team's field expert Andy lee found out about manipulating the ramp: : (the -'s are just for spacing) : Data set one: An unloaded ramp. : Inches froms pivot point----Static mass required to ----------------------------change posistion(lbs). : ----------------------------Slanted--------Balanced : 12--------------------------30--------------80 : 24--------------------------15--------------30 : 36--------------------------10--------------15 : 48--------------------------5---------------10 : Data set two: Loaded with 260Lbs of robot(105bls), goals(70lbsx2), and balls(black 1lbsx10 each & one big 5lbs) : : Inches froms pivot point----Static mass required to ----------------------------change posistion(lbs). : ----------------------------Slanted--------Balanced : 12--------------------------170--------------80 : 24--------------------------50---------------30 : 36--------------------------30---------------15 : 48--------------------------25---------------10 : : Force to hold a goal on the ramp while tilted = 10 Lbs : Constant force required to pull the goal up the ramp = 20 lbs : Force to pull the strecher up the ramp = 30lbs : These are all approximate values due to the dynamic nature of the system. Ken, Thank you and your team for generating and posting the bridge force data set. What I find quite interesting is that the force at each point to tip a balanced bridge is the same whether the bridge is empty or loaded with a robot and two full goals. It doesn't look like dragging a couple of goals up with the bot is going to make it any less twitchy to balance! Dodd |
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