ICDP1a

ICDP1a - CE 361 In-Class Design Problem Vehicle Design For...

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CE 361 In-Class Design Problem: Vehicle Design For this exercise, you are to design a vehicle by selecting dimensions, engine size, etc. You will need to make a number of assumptions, and typical road tests are provided to help you in this regard. Based on your knowledge of vehicle design, select reasonable values for the following vehicle attributes: Vehicle weight (lb) Engine power and torque (estimate based on roadtests provided) Front or rear wheel drive Wheelbase Location of center of gravity Total frontal area Passenger capacity Driver’s eye height Overall gear reduction ratio (estimate based on roadtests provided) Approximate 0 – 60 mi/h time Based on the values selected above, compute the following: 1. Optimal brake-force proportioning (front and rear) on good, wet pavement at 70 mi/h. 2. Maximum acceleration from rest on good, dry pavement. 3. Theoretical stopping distance (exclude perception/reaction time) without antilock brakes from 70 mi/h on good, dry pavement (assume a brake efficiency of 80 percent and ignore aerodynamic resistance). 4. Theoretical stopping distance with antilock brakes (ABS) from 70 mi/h on good, dry pavement (assume appropriate brake efficiency for ABS and ignore aerodynamic resistance). 5. Include a sketch of your vehicle.

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List Price est \$19,999 Price as Tested est \$22,249 PERFORMANCE Acceleration Time to speed Seconds 0–30 mph ..... 2.5 0–40 mph ..... 3.8 0–50 mph ..... 5.0 0–60 mph ..... 6.8 0–70 mph ..... 8.6 0–80 mph ..... 11.0 0–90 mph ..... 13.7 0–100 mph ..... 16.8 Time to distance 0–100 ft ..... 3.3 0–500 ft ..... 8.3 0–900 ft ..... 11.9 0—1320 ft (¼ mile) ..... 15.1 @ 94.6 mph Braking Minimum stopping distance From 60 mph ..... 133 ft From 80 mph ..... 228 ft Control ..... excellent Brake feel ..... very good Overall brake rating ..... very good Subjective ratings consist of excellent, very good, good, average, poor; na means information is not available. Fuel Economy Our driving ..... 19.7 mpg EPA city/highway ..... 22/31 mpg Cruise range ..... 240 miles Fuel capacity ..... 13.2 gal. Handling Lateral acceleration (200-ft skidpad) ..... 0.85g Balance ..... mild understeer Speed through 700-ft slalom ..... 68.6 mph Balance ..... mild understeer Lateral seat support ..... good Interior Noise Idle in neutral ..... 45 dBA Maximum in 1st gear ..... 78 dBA Constant 50 mph ..... 69 dBA 70 mph ..... 72 dBA Engine Type ..... aluminum block & head, inline-4 Valvetrain ..... dohc 4-valve/cyl Displacement ..... 122 cu in./1998 cc Bore x stroke ..... 3.39 x 3.39 in./ 86.0 x 86.0 mm Compression ratio ..... 11.0:1
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