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ME 270

ME 270. Car and Seatbelt Analysis By Joseph Roeschen. Begin by Opening Camp G. Open Camp G software Build Bond Graph according to system Select the Analyze button and then select Matlab Camp G opens Matlab At command prompt, type “Campgmatlab” and hit enter. Matlab Analysis.

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ME 270

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  1. ME 270 Car and Seatbelt Analysis By Joseph Roeschen

  2. Begin by Opening Camp G • Open Camp G software • Build Bond Graph according to system • Select the Analyze button and then select Matlab • Camp G opens Matlab • At command prompt, type “Campgmatlab” and hit enter

  3. Matlab Analysis • Once Matlab has completed opening the file, select the “campgmod” tab and enter the system variables

  4. Enter System Variables as Follows and Run Model: Initial conditions ........ Q5IN= 0 ; Q11IN= 0 ; P13IN=100*25*.44704 ; P7IN= 1500*25*.44704 ; initial = [Q5IN; Q11IN; P13IN; P7IN] ; % System Physical Parameters........ R4 = 80000 ; C5 = 1/300000 ; I7 = 1500 ; R10 = 500 ; C11 = 1/10000 ; I13 = 100 ; External inputs ...... global SF1 SF1 = 0 ; Simulation Time Control ..... t0= 0 ; % Initial Time tf= 5 ;

  5. Model Output @ 25mph

  6. Model Output @ 55mph

  7. Analyze Displacement of Dummy and Force of Seatbelts • 30mph is critical velocity where dummy does not hit windshield (@ 1meter), but at force of 10,000N with single belt, dummy does not survive. Duel belts would save dummy in this situation. • With single belt configuration, 20mph is critical velocity where no injury or windshield contact occurs (6672 Newton's).

  8. Time to Windshield w/o seatbelt • @ 55mph, contact occurs at .058 seconds • @ 40mph, contact occurs at .065 seconds • @ 25mph, contact occurs at .1 seconds

  9. Build Simulink Model and Verify

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