Highway Engineering CE 431

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Presentation transcript:

Highway Engineering CE 431 Resistances Eng. Ali Mohammed Babalghaith

Types of resistance: Inertial resistance Grade resistance Rolling resistance Curve resistance Air resistance

1- Inertial resistance :- Page 118

2- Grade resistance:- Page 118 Grade +2% 2 100 Page 119

3- Rolling resistance:- Page 119

4- Curve resistance:- Page 119

5- Air resistance:- Page 120

Power Requirement:- Page 120

Problem 5.6 :- page 122 5.6 Estimate the horsepower required to accelerate a 2,500-lb vehicle traveling 30 mph up a 5.0 percent grade at a rate of 6 ft/sec2. The vehicle has a frontal cross-section area of 20 ft2. The roadway has straight alignment and a badly broken and patched asphalt surface. Assume the drag coefficient = 0.3. Given : Horsepower = ??? Vehicle weight = 2500 lb speed = 30 mph grade = +5% acceleration rate = 6 ft/sec2 Frontal cross-sectional area = 20 ft2 drag coefficient = 0.3 No Horizontal curve

Solution:- 1- Inertial resistance :-

Solution:- 2- Grade resistance :-

Solution:- 3- Rolling resistance :- From table page 119

Solution:- No Horizontal curve Fc = 0.00 4- Curve resistance :- Curve Resistance is not needed (value of zero) since the road is straight No Horizontal curve Fc = 0.00

Solution:- 5- Air resistance :-

Solution:- Power Requirements :-