SlideShare une entreprise Scribd logo
1  sur  10
Télécharger pour lire hors ligne
Vehicle Dynamics
Example Problems
Example problems
• Calculate value of resistive forces
– Aerodynamic
– Rolling
– Gravity
• Power required to overcome resistive
forces
Problem 2.1
A new sports car has a drag coefficient of
0.29 and a frontal area of 20 ft2, and is
traveling at 100 mi/h. How much power is
required to overcome aerodynamic drag if
=0.002378 slugs/ft3?
Problem 2.2
A vehicle manufacturer is considering an engine for a new sedan (CD
= 0.25, Af = 17 ft2). The car will be tested at 100 mph maximum speed
on a concrete paved surface at sea level (ρ = 0.002378 slugs/ft3).
The car currently weights 2100 lb, but the designer selected an under-
powered engine because he did not account for aerodynamic and
rolling resistances. If 2 lb of additional vehicle weight is added for
each unit of horsepower needed to overcome the neglected
resistance, what will be the final weight of the car if it is to achieve its
100 mph speed?
Balance forces
• Calculate available tractive effort
– Maximum tractive effort
– Engine generated tractive effort
– Acceleration
• Calculate maximum speed
– Available engine power
– Resistive forces
– Maximum speed
Problem 2.8
A car is traveling on a paved road with CD = 0.35, Af = 21 ft2, W = 3000 lb,
ρ = 0.002378 slugs/ft3. Its engine is running at 3000 rpm and is
producing 250 ft-lb of torque. The car’s gear reduction ratio is 3.5 to 1,
driveline efficiency is 90%, driveline slippage is 3.5%, and the road-wheel
radius is 15 inches. What will the car’s maximum acceleration be under
these conditions on a level road? (assume the available tractive effort is
the engine-generated tractive effort)
Problem 2.10
• A 2500-lb car has a maximum speed of
150 miles/hour with 14 inch radius wheels,
a gear reduction of 3 to 1, and a driveline
efficiency of 90%. It is known that at the
car’s top speed the engine is producing
200 ft-lb of torque. If the car’s frontal area
is 25 ft2, what is its drag coefficient?
Braking and stopping
• Braking
– Braking force
– Brake force ratio
• Theoretical stopping distance
• Practical stopping distance
• Driver perception/reaction
Problem 2.20
• A driver is traveling at 110 miles/hour
down a 3% grade on good, wet pavement.
An accident investigation team noted that
braking skid marks started 590 ft before a
parked car was hit at an estimated 55
mi/h. Ignoring air resistance, and using
theoretical stopping distance, what was
the braking efficiency of the car?
Problem 2.23
• A car is traveling at 75 mi/h down a 3% grade on
poor, wet pavement. The car’s braking
efficiency is 90%. The brakes were applied 300
ft before impacting a object. The car had an
antilock braking system, but the system failed
200 ft after the brakes had been applied (wheels
locked). What speed was the car traveling at
just before it impacted the object? (Assume
theoretical stopping distance, ignore air
resistance, and let frl=0.015.)

Contenu connexe

Similaire à Vehicle Dynamics example problems.ppt

The Greening Of The Transportation Industry
The Greening Of The Transportation IndustryThe Greening Of The Transportation Industry
The Greening Of The Transportation Industryrandybbb
 
SELECTION OF POWERTRAIN TO ACHIEVE PERFORMANCE OF VEHICLE
SELECTION OF POWERTRAIN TO ACHIEVE PERFORMANCE OF VEHICLESELECTION OF POWERTRAIN TO ACHIEVE PERFORMANCE OF VEHICLE
SELECTION OF POWERTRAIN TO ACHIEVE PERFORMANCE OF VEHICLEJournal For Research
 
Mila - The Endurance Car PDR (Spring 2019)
Mila - The Endurance Car PDR (Spring 2019)Mila - The Endurance Car PDR (Spring 2019)
Mila - The Endurance Car PDR (Spring 2019)Hector Molina Rivera
 
ENGINE SELECTION & GEARBOX DESIGN_015453.pdf
ENGINE SELECTION & GEARBOX DESIGN_015453.pdfENGINE SELECTION & GEARBOX DESIGN_015453.pdf
ENGINE SELECTION & GEARBOX DESIGN_015453.pdfalvinsemel
 
SmartWay Transport Partnership - Trucking Efficiency Improvements
SmartWay Transport Partnership - Trucking Efficiency ImprovementsSmartWay Transport Partnership - Trucking Efficiency Improvements
SmartWay Transport Partnership - Trucking Efficiency ImprovementsSouth Shore Clean Cities
 
Advanced technology for fuel effieciency
Advanced technology for fuel effieciencyAdvanced technology for fuel effieciency
Advanced technology for fuel effieciencyAbdullah Sayeed
 
Fbp1043 web1 tagged op
Fbp1043 web1   tagged opFbp1043 web1   tagged op
Fbp1043 web1 tagged opAswin Poudel
 
Trolley assist dumpers
Trolley assist dumpersTrolley assist dumpers
Trolley assist dumpersChandan Chaman
 
2010 GMC Sierra Toledo Brochure
2010 GMC Sierra Toledo Brochure2010 GMC Sierra Toledo Brochure
2010 GMC Sierra Toledo BrochureBallas Buick GMC
 
2010 GMC Sierra Toledo Brochure
2010 GMC Sierra Toledo Brochure2010 GMC Sierra Toledo Brochure
2010 GMC Sierra Toledo BrochureBallas Buick GMC
 
Ch14.3 powerpoint
Ch14.3 powerpointCh14.3 powerpoint
Ch14.3 powerpointravh001
 
Brakingperformance
BrakingperformanceBrakingperformance
BrakingperformanceSuresh Ram
 
CARB - Understanding California Air Resources Board
CARB - Understanding California Air Resources BoardCARB - Understanding California Air Resources Board
CARB - Understanding California Air Resources BoardProgressive Reporting Agency
 
1999 Future Car_WI_Technical Paper
1999 Future Car_WI_Technical Paper1999 Future Car_WI_Technical Paper
1999 Future Car_WI_Technical PaperTim Roebke
 

Similaire à Vehicle Dynamics example problems.ppt (20)

The Greening Of The Transportation Industry
The Greening Of The Transportation IndustryThe Greening Of The Transportation Industry
The Greening Of The Transportation Industry
 
Air Powered Car
Air Powered CarAir Powered Car
Air Powered Car
 
SELECTION OF POWERTRAIN TO ACHIEVE PERFORMANCE OF VEHICLE
SELECTION OF POWERTRAIN TO ACHIEVE PERFORMANCE OF VEHICLESELECTION OF POWERTRAIN TO ACHIEVE PERFORMANCE OF VEHICLE
SELECTION OF POWERTRAIN TO ACHIEVE PERFORMANCE OF VEHICLE
 
Mila - The Endurance Car PDR (Spring 2019)
Mila - The Endurance Car PDR (Spring 2019)Mila - The Endurance Car PDR (Spring 2019)
Mila - The Endurance Car PDR (Spring 2019)
 
10 browand 10_11_trans
10 browand 10_11_trans10 browand 10_11_trans
10 browand 10_11_trans
 
Air powered car
Air powered car Air powered car
Air powered car
 
ENGINE SELECTION & GEARBOX DESIGN_015453.pdf
ENGINE SELECTION & GEARBOX DESIGN_015453.pdfENGINE SELECTION & GEARBOX DESIGN_015453.pdf
ENGINE SELECTION & GEARBOX DESIGN_015453.pdf
 
SmartWay Transport Partnership - Trucking Efficiency Improvements
SmartWay Transport Partnership - Trucking Efficiency ImprovementsSmartWay Transport Partnership - Trucking Efficiency Improvements
SmartWay Transport Partnership - Trucking Efficiency Improvements
 
Advanced technology for fuel effieciency
Advanced technology for fuel effieciencyAdvanced technology for fuel effieciency
Advanced technology for fuel effieciency
 
Bombardier Eco4
Bombardier Eco4Bombardier Eco4
Bombardier Eco4
 
Fbp1043 web1 tagged op
Fbp1043 web1   tagged opFbp1043 web1   tagged op
Fbp1043 web1 tagged op
 
Trolley assist dumpers
Trolley assist dumpersTrolley assist dumpers
Trolley assist dumpers
 
2010 GMC Sierra Toledo Brochure
2010 GMC Sierra Toledo Brochure2010 GMC Sierra Toledo Brochure
2010 GMC Sierra Toledo Brochure
 
2010 GMC Sierra Toledo Brochure
2010 GMC Sierra Toledo Brochure2010 GMC Sierra Toledo Brochure
2010 GMC Sierra Toledo Brochure
 
Ch14.3 powerpoint
Ch14.3 powerpointCh14.3 powerpoint
Ch14.3 powerpoint
 
air-powered-vehicles
air-powered-vehiclesair-powered-vehicles
air-powered-vehicles
 
Brakingperformance
BrakingperformanceBrakingperformance
Brakingperformance
 
Braking performance 4
Braking  performance 4Braking  performance 4
Braking performance 4
 
CARB - Understanding California Air Resources Board
CARB - Understanding California Air Resources BoardCARB - Understanding California Air Resources Board
CARB - Understanding California Air Resources Board
 
1999 Future Car_WI_Technical Paper
1999 Future Car_WI_Technical Paper1999 Future Car_WI_Technical Paper
1999 Future Car_WI_Technical Paper
 

Plus de KANWARGILL16

How_Differential_works.ppt
How_Differential_works.pptHow_Differential_works.ppt
How_Differential_works.pptKANWARGILL16
 
CHAPTER 3 CASTING.pptx
CHAPTER 3 CASTING.pptxCHAPTER 3 CASTING.pptx
CHAPTER 3 CASTING.pptxKANWARGILL16
 
FUNDAMENTALS OF METAL CASTING.ppt
FUNDAMENTALS OF METAL CASTING.pptFUNDAMENTALS OF METAL CASTING.ppt
FUNDAMENTALS OF METAL CASTING.pptKANWARGILL16
 
WELDING_DESIGN_AND_PROCESS_SELECTION.ppt
WELDING_DESIGN_AND_PROCESS_SELECTION.pptWELDING_DESIGN_AND_PROCESS_SELECTION.ppt
WELDING_DESIGN_AND_PROCESS_SELECTION.pptKANWARGILL16
 
EDM+Plasma Arc.ppt
EDM+Plasma Arc.pptEDM+Plasma Arc.ppt
EDM+Plasma Arc.pptKANWARGILL16
 
10_nontraditional.ppt
10_nontraditional.ppt10_nontraditional.ppt
10_nontraditional.pptKANWARGILL16
 
lathe-and-drilling-machines.ppt
lathe-and-drilling-machines.pptlathe-and-drilling-machines.ppt
lathe-and-drilling-machines.pptKANWARGILL16
 
Rapid Prototyping-2.ppt
Rapid Prototyping-2.pptRapid Prototyping-2.ppt
Rapid Prototyping-2.pptKANWARGILL16
 
Milling_machine_Operations.ppt
Milling_machine_Operations.pptMilling_machine_Operations.ppt
Milling_machine_Operations.pptKANWARGILL16
 
Electric_Vehicle_and_Hybrid_Electrique_V(1).pptx
Electric_Vehicle_and_Hybrid_Electrique_V(1).pptxElectric_Vehicle_and_Hybrid_Electrique_V(1).pptx
Electric_Vehicle_and_Hybrid_Electrique_V(1).pptxKANWARGILL16
 

Plus de KANWARGILL16 (18)

3.GETT.pptx
3.GETT.pptx3.GETT.pptx
3.GETT.pptx
 
brake.ppt
brake.pptbrake.ppt
brake.ppt
 
How_Differential_works.ppt
How_Differential_works.pptHow_Differential_works.ppt
How_Differential_works.ppt
 
MODULE_4.ppt
MODULE_4.pptMODULE_4.ppt
MODULE_4.ppt
 
CHAPTER 3 CASTING.pptx
CHAPTER 3 CASTING.pptxCHAPTER 3 CASTING.pptx
CHAPTER 3 CASTING.pptx
 
FUNDAMENTALS OF METAL CASTING.ppt
FUNDAMENTALS OF METAL CASTING.pptFUNDAMENTALS OF METAL CASTING.ppt
FUNDAMENTALS OF METAL CASTING.ppt
 
WELDING_DESIGN_AND_PROCESS_SELECTION.ppt
WELDING_DESIGN_AND_PROCESS_SELECTION.pptWELDING_DESIGN_AND_PROCESS_SELECTION.ppt
WELDING_DESIGN_AND_PROCESS_SELECTION.ppt
 
MODULE_3.ppt
MODULE_3.pptMODULE_3.ppt
MODULE_3.ppt
 
EDM+Plasma Arc.ppt
EDM+Plasma Arc.pptEDM+Plasma Arc.ppt
EDM+Plasma Arc.ppt
 
10_nontraditional.ppt
10_nontraditional.ppt10_nontraditional.ppt
10_nontraditional.ppt
 
Abrasive.pptx
Abrasive.pptxAbrasive.pptx
Abrasive.pptx
 
lathe-and-drilling-machines.ppt
lathe-and-drilling-machines.pptlathe-and-drilling-machines.ppt
lathe-and-drilling-machines.ppt
 
Rapid Prototyping-2.ppt
Rapid Prototyping-2.pptRapid Prototyping-2.ppt
Rapid Prototyping-2.ppt
 
Milling_machine_Operations.ppt
Milling_machine_Operations.pptMilling_machine_Operations.ppt
Milling_machine_Operations.ppt
 
4_cutting.ppt
4_cutting.ppt4_cutting.ppt
4_cutting.ppt
 
ie550pp.ppt
ie550pp.pptie550pp.ppt
ie550pp.ppt
 
Feb 27 2004.ppt
Feb 27 2004.pptFeb 27 2004.ppt
Feb 27 2004.ppt
 
Electric_Vehicle_and_Hybrid_Electrique_V(1).pptx
Electric_Vehicle_and_Hybrid_Electrique_V(1).pptxElectric_Vehicle_and_Hybrid_Electrique_V(1).pptx
Electric_Vehicle_and_Hybrid_Electrique_V(1).pptx
 

Dernier

Lakshitha maduranga CV - for data entry clerck
Lakshitha maduranga CV - for data entry clerckLakshitha maduranga CV - for data entry clerck
Lakshitha maduranga CV - for data entry clerckLakshanMadhushanka3
 
Work Experience - A Love Supreme.ghgfhdgfhfgpptx
Work Experience - A Love Supreme.ghgfhdgfhfgpptxWork Experience - A Love Supreme.ghgfhdgfhfgpptx
Work Experience - A Love Supreme.ghgfhdgfhfgpptxLewisJB
 
Commercial Extractor fan repair services
Commercial Extractor fan repair servicesCommercial Extractor fan repair services
Commercial Extractor fan repair servicesmb1294198
 
Study on Financing of zero-emission trucks and their infrastructure
Study on Financing of zero-emission trucks and their infrastructureStudy on Financing of zero-emission trucks and their infrastructure
Study on Financing of zero-emission trucks and their infrastructureEuropeanCleanTruckin
 
Nosfdsfsdfasdfasdfasdfsadf asdfasdfasdfasdf
Nosfdsfsdfasdfasdfasdfsadf asdfasdfasdfasdfNosfdsfsdfasdfasdfasdfsadf asdfasdfasdfasdf
Nosfdsfsdfasdfasdfasdfsadf asdfasdfasdfasdfJulia Kaye
 
Modern Trams, Light rail transit systems.pdf
Modern Trams, Light rail transit  systems.pdfModern Trams, Light rail transit  systems.pdf
Modern Trams, Light rail transit systems.pdfmaputi
 

Dernier (8)

Lakshitha maduranga CV - for data entry clerck
Lakshitha maduranga CV - for data entry clerckLakshitha maduranga CV - for data entry clerck
Lakshitha maduranga CV - for data entry clerck
 
Work Experience - A Love Supreme.ghgfhdgfhfgpptx
Work Experience - A Love Supreme.ghgfhdgfhfgpptxWork Experience - A Love Supreme.ghgfhdgfhfgpptx
Work Experience - A Love Supreme.ghgfhdgfhfgpptx
 
Commercial Extractor fan repair services
Commercial Extractor fan repair servicesCommercial Extractor fan repair services
Commercial Extractor fan repair services
 
Reinventing the Car - as I reported it in 1985!
Reinventing the Car - as I reported it in 1985!Reinventing the Car - as I reported it in 1985!
Reinventing the Car - as I reported it in 1985!
 
Study on Financing of zero-emission trucks and their infrastructure
Study on Financing of zero-emission trucks and their infrastructureStudy on Financing of zero-emission trucks and their infrastructure
Study on Financing of zero-emission trucks and their infrastructure
 
Nosfdsfsdfasdfasdfasdfsadf asdfasdfasdfasdf
Nosfdsfsdfasdfasdfasdfsadf asdfasdfasdfasdfNosfdsfsdfasdfasdfasdfsadf asdfasdfasdfasdf
Nosfdsfsdfasdfasdfasdfsadf asdfasdfasdfasdf
 
Modern Trams, Light rail transit systems.pdf
Modern Trams, Light rail transit  systems.pdfModern Trams, Light rail transit  systems.pdf
Modern Trams, Light rail transit systems.pdf
 
EVAT - Future Mobility Transformation in Thailand
EVAT - Future Mobility Transformation in ThailandEVAT - Future Mobility Transformation in Thailand
EVAT - Future Mobility Transformation in Thailand
 

Vehicle Dynamics example problems.ppt

  • 2. Example problems • Calculate value of resistive forces – Aerodynamic – Rolling – Gravity • Power required to overcome resistive forces
  • 3. Problem 2.1 A new sports car has a drag coefficient of 0.29 and a frontal area of 20 ft2, and is traveling at 100 mi/h. How much power is required to overcome aerodynamic drag if =0.002378 slugs/ft3?
  • 4. Problem 2.2 A vehicle manufacturer is considering an engine for a new sedan (CD = 0.25, Af = 17 ft2). The car will be tested at 100 mph maximum speed on a concrete paved surface at sea level (ρ = 0.002378 slugs/ft3). The car currently weights 2100 lb, but the designer selected an under- powered engine because he did not account for aerodynamic and rolling resistances. If 2 lb of additional vehicle weight is added for each unit of horsepower needed to overcome the neglected resistance, what will be the final weight of the car if it is to achieve its 100 mph speed?
  • 5. Balance forces • Calculate available tractive effort – Maximum tractive effort – Engine generated tractive effort – Acceleration • Calculate maximum speed – Available engine power – Resistive forces – Maximum speed
  • 6. Problem 2.8 A car is traveling on a paved road with CD = 0.35, Af = 21 ft2, W = 3000 lb, ρ = 0.002378 slugs/ft3. Its engine is running at 3000 rpm and is producing 250 ft-lb of torque. The car’s gear reduction ratio is 3.5 to 1, driveline efficiency is 90%, driveline slippage is 3.5%, and the road-wheel radius is 15 inches. What will the car’s maximum acceleration be under these conditions on a level road? (assume the available tractive effort is the engine-generated tractive effort)
  • 7. Problem 2.10 • A 2500-lb car has a maximum speed of 150 miles/hour with 14 inch radius wheels, a gear reduction of 3 to 1, and a driveline efficiency of 90%. It is known that at the car’s top speed the engine is producing 200 ft-lb of torque. If the car’s frontal area is 25 ft2, what is its drag coefficient?
  • 8. Braking and stopping • Braking – Braking force – Brake force ratio • Theoretical stopping distance • Practical stopping distance • Driver perception/reaction
  • 9. Problem 2.20 • A driver is traveling at 110 miles/hour down a 3% grade on good, wet pavement. An accident investigation team noted that braking skid marks started 590 ft before a parked car was hit at an estimated 55 mi/h. Ignoring air resistance, and using theoretical stopping distance, what was the braking efficiency of the car?
  • 10. Problem 2.23 • A car is traveling at 75 mi/h down a 3% grade on poor, wet pavement. The car’s braking efficiency is 90%. The brakes were applied 300 ft before impacting a object. The car had an antilock braking system, but the system failed 200 ft after the brakes had been applied (wheels locked). What speed was the car traveling at just before it impacted the object? (Assume theoretical stopping distance, ignore air resistance, and let frl=0.015.)