1955 Vehicle Dynamics!!!
Senior User
Joined: Jul 2000
Posts: 151
Likes: 5
From: Tucson, AZ
scottjo,
Looks like you are already on to this, but the easiest way to get the CG location is to get the weights on the axles with the vehicle resting normally, then incline it as much as possible and get the weights on the support points. Sum the moments about the supports and you can get the CG offset from the load shift. This is how the SAE accident reconstruction types, etc., usually do it.
The best way to do this is with an overhead crane and a high-capacity hanging scale in between the hook on the crane and the bumper (or whatever) on your truck. I would support the truck at the bumpers and lift each end. There are probably a number of scales around the University that will work. (I would look in the ME and CE departements.) The scales are available with 5000 lb capacity accurate to +/- 5 lb. (for example, see http://www.mcmaster.com/ page 1501)
Sounds like a great class. Have you looked at the program SMAC? SMAC dates back to the early 70's and is still in use as a forensic tool.
Cal
Looks like you are already on to this, but the easiest way to get the CG location is to get the weights on the axles with the vehicle resting normally, then incline it as much as possible and get the weights on the support points. Sum the moments about the supports and you can get the CG offset from the load shift. This is how the SAE accident reconstruction types, etc., usually do it.
The best way to do this is with an overhead crane and a high-capacity hanging scale in between the hook on the crane and the bumper (or whatever) on your truck. I would support the truck at the bumpers and lift each end. There are probably a number of scales around the University that will work. (I would look in the ME and CE departements.) The scales are available with 5000 lb capacity accurate to +/- 5 lb. (for example, see http://www.mcmaster.com/ page 1501)
Sounds like a great class. Have you looked at the program SMAC? SMAC dates back to the early 70's and is still in use as a forensic tool.
Cal
I'll have the Roast Duck
Joined: Jul 2002
Posts: 9,622
Likes: 110
From: Northshore, MN
Originally Posted by ALBUQ F-1
My experience with truck scales is that they are accurate to +/- 1,000 lbs. The gravel yard I go to weighs you going in and coming out. Same truck has been as high as 5,800 and as low as 5,200, empty. It's because they are set up to weigh 50,000 lb semi and tandem-axle rigs.
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Senior User
Joined: Aug 2005
Posts: 129
Likes: 0
From: East Liberty, OH
Well I got it weighed, and with me (185lbs) and a full tank of gas( stock tank), a 292 Y-block & 4 speed, dana 60 rear end, oak floor boards in a long box and NO running boards I got a total weight of 3880 LBS with 2340 on the front 1540 on the rear, Left front is 1220, Right front 1120, Left rear 900, Right rear 640. I Got some other things to do before I find the CG and look at the rest of my Homework..........like go have a few............too many, Frosties with my buddies.........well I AM in college, only 8 months left to be Irresponsible!!!!
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