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CABLE DESIGN PROJECT

Team 1Autumn Murphy, Zach Anderson, Shane Miller

1. Define a 3 cable system to lift truck.

2. Must lift from two corners and the opposite midpoint.

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Plan of Action

State given information Declare position Find Position vectors Find unit vectors Use E of E to solve

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Truck Information• Truck dimensions• Length = 307.4 in.• Width = 97.5 in.• Height = 115 in.• Weight = 5000

lbs.

Weight acts at center of truck

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Platform Information

• Platform Dimensions• Platform length = 353.4 in.• Platform width = 143.5 in.• Platform weight = 5000 lbs.

Weight acts at center of platform

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Lifting Hook

For now, assume that cables attached to the outer edges of the plates will not contact the truck.

• Lifting hook is located above platform at 230 in.• Being attached to 3 cable connected to a platform.

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FBD of Platform• Origin set at center of platform

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Calculating Forces in Cables

Step 1, Geometryrda -71.75 -176.7 -230 in.rdb 71.75 -176.7 -230 in.rdc 0 176.7 -230 in.u da -0.24014 -0.5914 -0.76979u db 0.240141 -0.5914 -0.76979u dc 0 0.609227 -0.793

x y z UnitsA -71.75 -176.7 0 in.B 71.75 -176.7 0 in.C 0 176.7 0 in.D 0 0 230 in.

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Calculating Forces in Cables

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Weight on the Cables• Cables DA & DB carry 3255 lbs.• Cable DC carries 6315 lbs.

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Tension on Mars

Earth MarsTda= 3255 lb 1236.9 lb

Tdb= 3255 lb 1236.9 lb

Tdc= 6315 lb 2399.7 lb

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The End