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ME 270 Vehicle Analysis

ME 270 Vehicle Analysis. By: Kevin McClain. ME 270. Objective Develop a mathematical model of a vehicle for simulation using CAMP-G and Matlab. Analyze the system for the following parameters. Ensure driver does not hit the windshield

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ME 270 Vehicle Analysis

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  1. ME 270 Vehicle Analysis By: Kevin McClain

  2. ME 270 • Objective • Develop a mathematical model of a vehicle for simulation using CAMP-G and Matlab. • Analyze the system for the following parameters. • Ensure driver does not hit the windshield • Determine if fatal injuries occur at speeds of 25 mph and 55 mph • Determine the “critical” speed at which the driver is not injured.

  3. ME 270 • Camp G • Bond Graph system representation *Illustration represents bond graph for single belt, Causalities not shown SF 1:vo 0 1:v2 0 1:v1 I:m I:M C:k1 R:b2 C:k2 R:b1

  4. ME 270 • Matlab • Select Matlab in the interface menu of Camp G • Camp G opens Matlab • At Matlab command prompt, enter “Campgmatlab” • Select the “campgmod” tab and enter the system parameters and variables.

  5. ME 270 • Matlab • System Parameters • Vehicle • Mass [M] = 1,500 kg • Bumper, Damper Rate [b2] = 80,000 N-s/m • Bumper, Spring Rate [k2] = 300,000 N/m • Seat Belt • Damper Rate [b1] = 500 N-s/m • Spring Rate [k1] = 10,000 N/m

  6. ME 270 • Matlab • System Parameters cont. • Driver • Mass [m] = 100 kg • Force on Driver Cannot Exceed 1,500 lbf (6,672 N) • Displacement of Driver Cannot Exceed 100 cm (1 m)

  7. ME 270 • Matlab • System variables • System Initial Conditions • Q5IN = 0 • Q11IN = 0 • P13IN=100*25*0.44704 • P7IN=1,500*25*0.44704 • Initial = [Q5IN; Q11IN; P13IN; P7IN]

  8. ME 270 • Matlab • System Variables cont. • System Parameters • R4 = 80,000 • C5 = 1/300,000 • I7 = 1500 • R10 = 500 • C11 = 1/10,000 • I13 = 100

  9. ME 270 • Matlab • System Variables cont. • External System Inputs • Global Source Flow 1 • SF1 = 0 • Simulation Time Control • T0 = 0 • Tf = 5

  10. ME 270 • Matlab

  11. ME 270 • Matlab • Model Output @ 55mph

  12. ME 270 • Analysis • 25 mph, One and Two Seat Belts • Driver will NOT contact windshield • Force on Driver is NOT fatal. • 55 mph, One and Two Seat Belts • Driver WILL contact windshield • Force on Driver IS fatal.

  13. ME 270 • Analysis cont. • Critical Velocity, One Seat Belt • Driver will not contact windshield and force on driver does not exceed allowable force at a speed of 30.58 mph • Critical Velocity, Two Seat Belts • Driver will not contact windshield and force on driver does not exceed allowable force at a speed of 44.97 mph

  14. ME 270 • Analysis cont. • Time to Windshield w/o seatbelt • 55mph, contact at .058 seconds • 40mph, contact at .065 seconds • 25mph, contact at .1 seconds

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