solve ut Problem 3. A tractor-trailer rig has a frontal area of A = 102 ft and drag coefficient Cp = 0.9. The ratio of rollingresistance to vehicle weight is CR = FR/W = (6 lbr)/(1000 lb;). The specific fuel consumption (defined as mass of fuelconsumed divided by power, or thrust, produced times the time period) for the diesel engine isSFC = m;/(PAt) 0.34 lb, and the drivetrain efficiency is na = 92%. The density of diesel fuel is p; = 6.9 lbm /gal.(a) Estimate the fuel economy, FE, for a rig traveling at a speed of U = 55 mph with a weight of W = 72,000 lbf.(b) For a fairing system that reduces the aerodynamic drag by 15%, estimate the improved fuel economy, FEfaired-(c) Calculate the annual fuel savings, FS, for a rig that travels 120, 000 miles per year. (d) Plot FE and FE faired versusspeed, U, assuming SfC and na are constant.

Data given- frontal area A = 102 ft2 Drag coefficient cD = 0.9 Tractor weight W= 72000 lbf Rolling…

Problem 3. A tractor-trailer rig has a frontal area of A = 102 ft² and drag coefficient Cp = 0.9. The ratio of rolling resistance to vehicle weight is CR = FR/W = (6 lbr)/(1000 lb;). The specific fuel consumption (defined as mass of fuel consumed divided by power, or thrust, produced times the time period) for the diesel engine is SFC = mj/(PAt) 0.34 lb, and the drivetrain efficiency is na = 92%. The density of diesel fuel is py = 6.9 lb, /gal. (a) Estimate the fuel economy, FE, for a rig traveling at a speed of U = 55 mph with a weight of W = 72,000 lb/. (b) For a fairing system that reduces the aerodynamic drag by 15%, estimate the improved fuel economy, FE faired- (c) Calculate the annual fuel savings, FS, for a rig that travels 120, 000 miles per year. (d) Plot FE and FE faired versus speed, U, assuming SFC and n4 are constant.

Problem 3. A tractor-trailer rig has a frontal area of A = 102 ft² and drag coefficient Cp = 0.9. The ratio of rolling resistance to vehicle weight is CR = FR/W = (6 lbr)/(1000 lb;). The specific fuel consumption (defined as mass of fuel consumed divided by power, or thrust, produced times the time period) for the diesel engine is SFC = mj/(PAt) 0.34 lb, and the drivetrain efficiency is na = 92%. The density of diesel fuel is py = 6.9 lb, /gal. (a) Estimate the fuel economy, FE, for a rig traveling at a speed of U = 55 mph with a weight of W = 72,000 lb/. (b) For a fairing system that reduces the aerodynamic drag by 15%, estimate the improved fuel economy, FE faired- (c) Calculate the annual fuel savings, FS, for a rig that travels 120, 000 miles per year. (d) Plot FE and FE faired versus speed, U, assuming SFC and n4 are constant.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

solve ut

Problem 3. A tractor-trailer rig has a frontal area of A = 102 ft and drag coefficient Cp = 0.9. The ratio of rolling
resistance to vehicle weight is CR = FR/W = (6 lbr)/(1000 lb;). The specific fuel consumption (defined as mass of fuel
consumed divided by power, or thrust, produced times the time period) for the diesel engine is
SFC = m;/(PAt) 0.34 lb, and the drivetrain efficiency is na = 92%. The density of diesel fuel is p; = 6.9 lbm /gal.
(a) Estimate the fuel economy, FE, for a rig traveling at a speed of U = 55 mph with a weight of W = 72,000 lbf.
(b) For a fairing system that reduces the aerodynamic drag by 15%, estimate the improved fuel economy, FEfaired-
(c) Calculate the annual fuel savings, FS, for a rig that travels 120, 000 miles per year. (d) Plot FE and FE faired versus
speed, U, assuming SfC and na are constant.

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