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PORTALE DELLA DIDATTICA

Motor vehicle design

04LNLLI, 04LNLLN

A.A. 2020/21

2020/21

Motor vehicle design

The module aims at providing the basic engineering knowledge for the main vehicle subsystems and how they influence the vehicle performances. Tyres and wheels, suspension, brake and steering systems are analysed to understand their functions, the most common structure and construction, and how to model their behaviour. The module also has the goal of giving the students the instruments to compute vehicle performance in terms of speed, acceleration fuel consumption and handling.

Motor vehicle design

The aim of the course is to provide the system level knowledge of the the vehicle performances in longitudinal and lateral behaviour. Components such as tyres and wheels, suspensions, brake and steering systems are analysed to understand their functions, their most common structure and construction, and how to model their behaviour. The knowledge of the subsystem components allows then to compute vehicle performance in terms of speed, acceleration fuel consumption, stability and handling.

Motor vehicle design

The student is expected to learn the functionality, and the main characteristics of the vehicle subsystems such as tyres, brakes, suspensions, steering, powertrain (conventional, hybrid, electric). Ability to analyse and simulate the main performances of a motor vehicle in straight running and in handling, stability, fuel consumption.

Motor vehicle design

At the end of the course the student will know the main characteristics of the following vehicle subsystems: - Tire construction, longitudinal, lateral and combined behavior, rolling resistance. - Powertrain architecture and main performance and fuel consumption characteristics - Brake system architecture and components - Steering system kinematics and components - Suspension system elasto-kinematics and construction The acquired skills will enable to compute vehicle performance in terms of speed, acceleration fuel consumption and handling. This requires the student the capability to: - Model and predict the vehicle performances and fuel consumption due to factors such as mass distribution, tire behavior, powertrain characteristics. - Decide the most suitable transmission ratios. - Determine the front-rear brake split and torque requirements of the brake system. - Model and predict the vertical dynamic behavior of the suspensions by means of simplified approaches such as the quarter car model. - Model and predict the vehicle performances during steady state cornering. Understand under and over-steering behavior and the parameters that affect the vehicle stability.

Motor vehicle design

Prerequisite for understanding the contents of this module are: Technical drawing, Mathematical analysis I e II, Physics, Geometry, Applied Mechanics. Additionally, Automotive evolution is suggested to gain a broader insight in the topic.

Motor vehicle design

Prerequisite for understanding the contents of this module are: Technical drawing, Mathematical analysis I e II, Physics, Geometry, Applied Mechanics. Additionally, Automotive evolution is suggested to gain a broader insight in the topic.

Motor vehicle design

1. Introduction: aims and contents of the module, suggested textbooks and exam procedure. 2. Reference frames for the vehicle and the tires. 3. Forces and moments acting on a vehicle, tire-road contact forces, aerodynamic forces and moments 4. Longitudinal performance of the vehicle, distribution of ground loads and load transfer, power required for motion, available power, choice of the gear ratios, maximum performance (speed, acceleration, gradeability); fuel consumption, braking and distribution of the braking power on the wheels. 5. Lateral performance of the vehicle. Kinematic steering and basic handling models. Vehicle lateral stability. Under and oversteering behaviour, influence of the cross wind. 6. Vehicle subsystems. Functional analysis and construction details of the most common vehicle subsystems such as: -suspensions and their elasto-kinematic behaviour. Dampers and shock absorbers. -steering system and its kinematic behaviour. -braking system, brake types, brake circuit, power brake, system level understanding of ABS, and ESP systems.

Motor vehicle design

1. Introduction: aims and contents of the module, suggested textbooks and exam procedure (1.5 hours). 2. Forces and moments acting on a vehicle, tire-road contact forces, aerodynamic forces and moments (12 hours) 3. Longitudinal performance of the vehicle, distribution of ground loads and load transfer, power required for motion, available power, choice of the gear ratios, maximum performance (speed, acceleration, gradeability); fuel consumption, braking and distribution of the braking power on the wheels (13.5 hours). 4. Lateral performance of the vehicle. Kinematic steering and basic handling models. Vehicle lateral stability. Under and oversteering behaviour, influence of the cross wind (9 hours) 5. Vehicle subsystems (18 hours). Functional analysis and construction details of the most common vehicle subsystems such as: -suspensions and their elasto-kinematic behaviour. Dampers and shock absorbers. -steering system and its kinematic behaviour. -braking system, brake types, brake circuit, power brake, system level understanding of ABS, and ESP systems.

Motor vehicle design

Motor vehicle design

Motor vehicle design

The course is organised as follows Lessons in classroom: 54 hours Exercises: The exercises are organised in 3 projects about the following topics: tire behaviour, longitudinal dynamics, brake split analysis, suspension kinematics. The projects are carried on in teams of typically 3-4 students each. All teams attend 12 hours in classroom to have a general explanation and then 14 hours in LAIB to perform the numerical analyses required by the four projects.

Motor vehicle design

The course is organised as follows Lessons in classroom: 54 hours Exercises: The exercises are organised in 3 projects about the following topics: tire behaviour, longitudinal dynamics, brake split analysis, suspension kinematics. The projects are carried on in teams of typically 3-4 students each. All teams attend 12 hours in classroom to have a general explanation and then 14 hours in LAIB to perform the numerical analyses required by the four projects. In a.y. 2020/21 the lessons and exercises will be held in the form of virtual classooms by means of the BBB platform. All virtual classrooms will be recorded and made available on Portale della Didattica. A in the presence exercise session will be made available each week for a number of students according to the safety regulations and on the availability of classrooms.

Motor vehicle design

The recommended reference text is: G. Genta, L. Morello, The automotive Chassis, Springer, 2008 Useful sources for further closer examinations: Milliken W. F., Milliken D. L., Race Car Vehicle Dynamics, SAE International. Genta G., Motor vehicle mechanics, World Scientific, Singapore, 2004 Reimpell J., Stoll H., Betzler J.; The Automotive Chassis, Butterworth-Heinemann, 2001 Naunheimer, H., Bertsche, B., Ryborz, J., Novak, W.; Automotive Transmissions, Springer, 2011.

Motor vehicle design

The documentation for preparing the exam recommended reference text is: G. Genta, L. Morello, The automotive Chassis, Springer, 2008 Useful sources for further closer examinations: Milliken W. F., Milliken D. L., Race Car Vehicle Dynamics, SAE International. Genta G., Motor vehicle mechanics, World Scientific, Singapore, 2004 Reimpell J., Stoll H., Betzler J.; The Automotive Chassis, Butterworth-Heinemann, 2001 Naunheimer, H., Bertsche, B., Ryborz, J., Novak, W.; Automotive Transmissions, Springer, 2011.

Motor vehicle design

Modalità di esame: Prova orale facoltativa; Prova scritta tramite PC con l'utilizzo della piattaforma di ateneo; Elaborato progettuale in gruppo;

Motor vehicle design

Learning outcomes

Motor vehicle design

Exam: Optional oral exam; Computer-based written test using the PoliTo platform; Group project;

Motor vehicle design

Expected learning outcomes. The aim of the course is to provide the basic engineering knowledge for the main vehicle subsystems and how they influence the vehicle performances. This requires the student to know the main characteristics of the following vehicle subsystems: - Tire construction, longitudinal, lateral and combined behavior, rolling resistance. - Powertrain architecture and main performance and fuel consumption characteristics - Brake system architecture and components - Steering system kinematics and components - Suspension system elasto-kinematics and construction The course has also the goal of giving the students the instruments to compute vehicle performance in terms of speed, acceleration fuel consumption and handling. This requires the student the capability to: - Model and predict the vehicle performances and fuel consumption due to factors such as mass distribution, tire behavior, powertrain characteristics. - Decide the most suitable transmission ratios. - Determine the front-rear brake split and torque requirements of the brake system. - Model and predict the vertical dynamic behavior of the suspensions by means of simplified approaches such as the quarter car model. - Model and predict the vehicle performances during steady state cornering. Understand under and over-steering behavior and the parameters that affect the vehicle stability. Exam rules and procedure The Motor Vehicle Design exam consists of an online written based on the Exam Platform and Respondus interface, it includes 30 multiple choice questions and 8 numerical exercises. The evaluation of the exercise reports prepared during the semester is included in the written exam. Each multiple-choice question has just one correct answer. The numerical exercises require to solve a numerical problem similar to those shown during the exercise lessons. The time to complete the exam is 2 hours. During the exam it is possible to use just a simple scientific calculator, pen and paper or the calculator available in Respondus interface. Exchange information among students is not permitted by any means. Use of multimedia devices such as cell phone, tablet, pc, smart watch is not allowed. Use of any written material such as notes, textbooks is not allowed. Scoring: The total exam score is composed by the evaluation of the written exam, the exercise reports and an optional oral as follows Written exam The written exam is composed of multiple choice questions, numerical exercises, and exercise reports 30 m.c.questions Correct answer: + 1 point No answer: 0 points Wrong answer: - 1/2 points 8 numerical exercises Correct answer: +2 points No or wrong answer: 0 points The total score of the multiple-choice questions and the numerical exercises is rescaled linearly to 32/30. The four exercise reports prepared during the semester are evaluated with a score from 0 to 3 points that are added to the score of the multiple-choice questions and the numerical exercises (after rescaling). The exercise reports have to be uploaded in pdf form on the “elaborati” section of the Portale della Didattica at least one week before the written exam. Score of written exam=(score of multiple choice + score of numerical exercise)*32/46 + score of exercise reports. The exam is overcome successfully for scores higher than 18/30. The scores of the written exam are uploaded on Portale della Didattica within a week from the written exam. Optional oral examinations is possible just for scores of the written exam higher or equal to 25/30 or in cases left to the teacher's decision, such as an unclear result of the written. The oral examination consists in a number of at least three questions covering the course program for a further assessment of the expected learning outcomes. The student will be asked to answer giving priority to quantitative arguments, graphical representations, and analytical reasoning.

Motor vehicle design

Modalità di esame: Prova scritta (in aula); Prova orale facoltativa; Elaborato scritto individuale;

Motor vehicle design

Expected learning outcomes. The aim of the course is to provide the basic engineering knowledge for the main vehicle subsystems and how they influence the vehicle performances. This requires the student to know the main characteristics of the following vehicle subsystems: - Tire construction, longitudinal, lateral and combined behavior, rolling resistance. - Powertrain architecture and main performance and fuel consumption characteristics - Brake system architecture and components - Steering system kinematics and components - Suspension system elasto-kinematics and construction The course has also the goal of giving the students the instruments to compute vehicle performance in terms of speed, acceleration fuel consumption and handling. This requires the student the capability to: - Model and predict the vehicle performances and fuel consumption due to factors such as mass distribution, tire behavior, powertrain characteristics. - Decide the most suitable transmission ratios. - Determine the front-rear brake split and torque requirements of the brake system. - Model and predict the vertical dynamic behavior of the suspensions by means of simplified approaches such as the quarter car model. - Model and predict the vehicle performances during steady state cornering. Understand under and over-steering behavior and the parameters that affect the vehicle stability. Exam rules and procedure The Motor Vehicle Design exam consists of 30 multiple choice questions and 8 numerical exercises. Each multiple-choice question has just one correct answer. The numerical exercises require to solve a numerical problem similar to those shown during the exercise lessons. The time to complete the exam is 2 hours. During the exam it is possible to use just a simple scientific calculator, pen and paper or the calculator available in Respondus interface. Exchange information among students is not permitted by any means. Use of multimedia devices such as cell phone, tablet, pc, smart watch is not allowed. Use of any written material such as notes, textbooks is not allowed. Scoring: The total exam score is composed by the evaluation of the written exam, the exercise reports and an optional oral as follows Written exam The written exam is composed of multiple choice questions, numerical exercises, and exercise reports 30 m.c.questions Correct answer: + 1 point No answer: 0 points Wrong answer: - 1/2 points 8 numerical exercises Correct answer: +2 points No or wrong answer: 0 points The total score of the multiple-choice questions and the numerical exercises is rescaled linearly to 32/30. The four exercise reports prepared during the semester are evaluated with a score from 0 to 3 points that are added to the score of the multiple-choice questions and the numerical exercises (after rescaling). The exercise reports have to be uploaded in pdf form on the “elaborati” section of the Portale della Didattica at least one week before the written exam. Score of written exam=(score of multiple choice + score of numerical exercise)*32/46 + score of exercise reports. The exam is overcome successfully for scores higher than 18/30. The scores are uploaded on Portale della Didattica within a week from the written exam.

Motor vehicle design

Exam: Written test; Optional oral exam; Individual essay;

Motor vehicle design

Expected learning outcomes. The aim of the course is to provide the basic engineering knowledge for the main vehicle subsystems and how they influence the vehicle performances. This requires the student to know the main characteristics of the following vehicle subsystems: - Tire construction, longitudinal, lateral and combined behavior, rolling resistance. - Powertrain architecture and main performance and fuel consumption characteristics - Brake system architecture and components - Steering system kinematics and components - Suspension system elasto-kinematics and construction The course has also the goal of giving the students the instruments to compute vehicle performance in terms of speed, acceleration fuel consumption and handling. This requires the student the capability to: - Model and predict the vehicle performances and fuel consumption due to factors such as mass distribution, tire behavior, powertrain characteristics. - Decide the most suitable transmission ratios. - Determine the front-rear brake split and torque requirements of the brake system. - Model and predict the vertical dynamic behavior of the suspensions by means of simplified approaches such as the quarter car model. - Model and predict the vehicle performances during steady state cornering. Understand under and over-steering behavior and the parameters that affect the vehicle stability. Exam rules and procedure The Motor Vehicle Design exam consists of 30 multiple choice questions and 8 numerical exercises. Each multiple-choice question has just one correct answer. The numerical exercises require to solve a numerical problem similar to those shown during the exercise lessons. The time to complete the exam is 2 hours. During the exam it is possible to use just a simple scientific calculator, pen and paper or the calculator available in Respondus interface. Exchange information among students is not permitted by any means. Use of multimedia devices such as cell phone, tablet, pc, smart watch is not allowed. Use of any written material such as notes, textbooks is not allowed. Scoring: The total exam score is composed by the evaluation of the written exam, the exercise reports and an optional oral as follows Written exam The written exam is composed of multiple choice questions, numerical exercises, and exercise reports 30 m.c.questions Correct answer: + 1 point No answer: 0 points Wrong answer: - 1/2 points 8 numerical exercises Correct answer: +2 points No or wrong answer: 0 points The total score of the multiple-choice questions and the numerical exercises is rescaled linearly to 32/30. The four exercise reports prepared during the semester are evaluated with a score from 0 to 3 points that are added to the score of the multiple-choice questions and the numerical exercises (after rescaling). The exercise reports have to be uploaded in pdf form on the “elaborati” section of the Portale della Didattica at least one week before the written exam. Score of written exam=(score of multiple choice + score of numerical exercise)*32/46 + score of exercise reports. The exam is overcome successfully for scores higher than 18/30. The scores of the written exam are uploaded on Portale della Didattica within a week from the written exam. Optional oral examinations is possible just for scores of the written exam higher or equal to 25/30 or in cases left to the teacher's decision, such as an unclear result of the written. The oral examination consists in a number of at least three questions covering the course program for a further assessment of the expected learning outcomes. The student will be asked to answer giving priority to quantitative arguments, graphical representations, and analytical reasoning.

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