Engineering Analysis for Portable Hockey Goal

1
Engineering AnalysisforPortable Hockey Goal

• March 3, 2004
• W.A.R.
• Andrew Clarke Sean Moseley
• Tyler Lowe Adam Waddle
• Nick Maser Davison Wilson
• ME 4182-C
• Professor Harvey Lipkin

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Weight

• Using a camping chair as an example
• Material Aluminum
• Pole Diameter (do) 3/4 inches
• Pole Thickness (t) 1/16 inches

• Cross-sectional area A 0.071 in2

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Weight (cont.)

• Total Length of Hockey Goal 660 in (55 feet)
• Volume V 46.9 in3
• Material Density r 0.0976 lbm/in3 (2.7
  g/cm3)
• Mass M rV 4.58 lbm (2.08 kg)
• Neglecting weight of the hinges and net

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Spring Analysis (opening)

• Opening time of 1 second
• x 3 feet (half the width of the goal)
• a x /t2 3.0 ft/s2
• Fopening m a 4.58 lbm 3.0 ft/s2
  13.74 lbf

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Spring Analysis (closing)

• Dx 10.75 inches
• Fclosing Fopening k Dx
• Therefore the spring constant k 1.28 lbf/in