Homework #3 solution

Homework #3 solution - VPI&SU Fall Semester 2008 CEE 3604...

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Fall Semester 2008 CEE 3604 - Homework #3 solution Interpretation of Sensitivity Tests Test 1: Decreasing the desired speed to 20 km/hr The fuel consumption is a concave curve and a function of speed. When speed decreases from 50 to 20 km/h, the engine consumes more fuel per km (inefficient fuel consumption). Since we are using the same annual utilization (hrs/year) the distance traveled (AKM) will be less and so interest and depreciation go up per 1000 km. However other parameters remain the same as base case. Test 2: Increasing desired speed to 100 km/h With the increased speed, the fuel consumption would be higher than that at a speed of 50 km/h since the engine needs to generate more power to overcome air resistance and partly resistance forces at a faster rate. However in contrast to test 1, higher speed means the distance traveled (AKM) is higher and consequently less depreciation and interest costs per 1000 km. Test 3: Increase payload to 400 kg
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Homework #3 solution - VPI&SU Fall Semester 2008 CEE 3604...

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