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References

Teaching Language

Course Content

Suggested readings

Learning Objectives

Prerequisites

Teaching Methods

Type of Assessment

Course program

Curriculum ELETTRICO/AUTOMAZIONE

Belonging Department

Ingegneria Industriale

Course Type

Attività formativa monodisciplinare

Scientific Area

ING-IND/13 - MECCANICA APPLICATA ALLE MACCHINE

Course year

Second year - Annualità Singola

Teaching Term

dal 17/09/2018 al 07/06/2019

Attendance required

No

Credits

9

Type of Evaluation

Voto Finale

Teaching Hours

81

Course Content

Course program

Lectureship

- Last name/s A-L ALLOTTA BENEDETTO
- Last name/s M-Z RINDI ANDREA

Italian

Italian

Planar and spatial mechanisms.

Friction and wear.

Kinetostatics

Efficiency of machines and group of machines.

Ordinary and differential gearings.

Gears.

Lubrication.

Motion transmission with flexible elements.

Lagrangian Dynamics.

Balancing of alternative mechanisms.

Friction and wear.

Kinetostatics

Efficiency of machines and group of machines.

Ordinary and differential gearings.

Gears.

Lubrication.

Motion transmission with flexible elements.

Lagrangian Dynamics.

Balancing of alternative mechanisms.

Planar and spatial mechanisms.

Friction and wear.

Kinetostatics

Efficiency of machines and group of machines.

Ordinary and differential gearings.

Gears.

Lubrication.

Motion transmission with flexible elements.

Lagrangian Dynamics.

Balancing of alternative mechanisms.

Friction and wear.

Kinetostatics

Efficiency of machines and group of machines.

Ordinary and differential gearings.

Gears.

Lubrication.

Motion transmission with flexible elements.

Lagrangian Dynamics.

Balancing of alternative mechanisms.

E. Funaioli ed altri, "Meccanica applicata alle macchine", vol. I e II, Ed. Patron Bologna.

S. Falomi, M. Malvezzi, S. Papini, "Esercitazioni di Meccanica Applicata alle Macchine", Volume 1 - Cinematica e Cinetostatica, Esculapio, Bologna.

M. Malvezzi, S. Papini, M.C. Valigi, "Esercitazioni di Meccanica Applicata alle Macchine", Volume 2, Dinamica e Ruotismi, Esculapio, Bologna.

S. Falomi, M. Malvezzi, S. Papini, "Esercitazioni di Meccanica Applicata alle Macchine", Volume 1 - Cinematica e Cinetostatica, Esculapio, Bologna.

M. Malvezzi, S. Papini, M.C. Valigi, "Esercitazioni di Meccanica Applicata alle Macchine", Volume 2, Dinamica e Ruotismi, Esculapio, Bologna.

E. Funaioli ed altri, "Meccanica applicata alle macchine", vol. I e II, Ed. Patron Bologna.

S. Falomi, M. Malvezzi, S. Papini, "Esercitazioni di Meccanica Applicata alle Macchine", Volume 1 - Cinematica e Cinetostatica, Esculapio, Bologna.

M. Malvezzi, S. Papini, M.C. Valigi, "Esercitazioni di Meccanica Applicata alle Macchine", Volume 2, Dinamica e Ruotismi, Esculapio, Bologna.

S. Falomi, M. Malvezzi, S. Papini, "Esercitazioni di Meccanica Applicata alle Macchine", Volume 1 - Cinematica e Cinetostatica, Esculapio, Bologna.

M. Malvezzi, S. Papini, M.C. Valigi, "Esercitazioni di Meccanica Applicata alle Macchine", Volume 2, Dinamica e Ruotismi, Esculapio, Bologna.

CC3: Systematic knowledge and understanding of the key aspects of mechanical design of industrial engineering and its methods. In particular: mechanical study of parts and assemblies, their dimensioning, their static and dynamic behaviour and interactions between components.

CC8: Knowledge and understanding of the wider multidisciplinary context of engineering with a particular focus on problem solving, which starts from the problem to identify causes and possible measures (typically multidisciplinary) to tackle them.

CA3: Applying knowledge and understanding related to the most appropriate methods of analysis, modelling, verification and experimentation to design, analyze and test machines and plants. This includes: the sizing and the functional and structural verification of components and mechanical groups subjected to static and fatigue stress; the functional setting of the design of a mechanical system, applying the principles of kinematics and static principles.

CA8: Applying knowledge and understanding problems related to multidisciplinary engineering, taking into account the constraints also of a non-technical nature, and working in collaboration with other engineers or other professional skills typically present in manufacturing companies.

In particular, to make the pupils familiar with: kinematic pairs and mechanisms; friction and wear, lubrication; application of Lagrangian dynamics to mechanisms. Make the pupils capable of: performing kinetostatic analysis of planar mechanisms, with and without friction, with graphical and analytical methods; performing the preliminary design of gearings and bearings.

CC8: Knowledge and understanding of the wider multidisciplinary context of engineering with a particular focus on problem solving, which starts from the problem to identify causes and possible measures (typically multidisciplinary) to tackle them.

CA3: Applying knowledge and understanding related to the most appropriate methods of analysis, modelling, verification and experimentation to design, analyze and test machines and plants. This includes: the sizing and the functional and structural verification of components and mechanical groups subjected to static and fatigue stress; the functional setting of the design of a mechanical system, applying the principles of kinematics and static principles.

CA8: Applying knowledge and understanding problems related to multidisciplinary engineering, taking into account the constraints also of a non-technical nature, and working in collaboration with other engineers or other professional skills typically present in manufacturing companies.

In particular, to make the pupils familiar with: kinematic pairs and mechanisms; friction and wear, lubrication; application of Lagrangian dynamics to mechanisms. Make the pupils capable of: performing kinetostatic analysis of planar mechanisms, with and without friction, with graphical and analytical methods; performing the preliminary design of gearings and bearings.

CC3: Systematic knowledge and understanding of the key aspects of mechanical design of industrial engineering and its methods. In particular: mechanical study of parts and assemblies, their dimensioning, their static and dynamic behaviour and interactions between components.

CC8: Knowledge and understanding of the wider multidisciplinary context of engineering with a particular focus on problem solving, which starts from the problem to identify causes and possible measures (typically multidisciplinary) to tackle them.

CA3: Applying knowledge and understanding related to the most appropriate methods of analysis, modelling, verification and experimentation to design, analyze and test machines and plants. This includes: the sizing and the functional and structural verification of components and mechanical groups subjected to static and fatigue stress; the functional setting of the design of a mechanical system, applying the principles of kinematics and static principles.

CA8: Applying knowledge and understanding problems related to multidisciplinary engineering, taking into account the constraints also of a non-technical nature, and working in collaboration with other engineers or other professional skills typically present in manufacturing companies.

In particular, to make the pupils familiar with: kinematic pairs and mechanisms; friction and wear, lubrication; application of Lagrangian dynamics to mechanisms. Make the pupils capable of: performing kinetostatic analysis of planar mechanisms, with and without friction, with graphical and analytical methods; performing the preliminary design of gearings and bearings.

CC8: Knowledge and understanding of the wider multidisciplinary context of engineering with a particular focus on problem solving, which starts from the problem to identify causes and possible measures (typically multidisciplinary) to tackle them.

CA3: Applying knowledge and understanding related to the most appropriate methods of analysis, modelling, verification and experimentation to design, analyze and test machines and plants. This includes: the sizing and the functional and structural verification of components and mechanical groups subjected to static and fatigue stress; the functional setting of the design of a mechanical system, applying the principles of kinematics and static principles.

CA8: Applying knowledge and understanding problems related to multidisciplinary engineering, taking into account the constraints also of a non-technical nature, and working in collaboration with other engineers or other professional skills typically present in manufacturing companies.

In particular, to make the pupils familiar with: kinematic pairs and mechanisms; friction and wear, lubrication; application of Lagrangian dynamics to mechanisms. Make the pupils capable of: performing kinetostatic analysis of planar mechanisms, with and without friction, with graphical and analytical methods; performing the preliminary design of gearings and bearings.

The lecturer assumes as acquired by the students the knowledge and competencies in phisics 1 (mechanics) and analytical dynamics

The lecturer assumes as acquired by the students the knowledge and competencies in phisics 1 (mechanics) and analytical dynamics

De visu lectures; class exercise

De visu lectures; class exercise

Oral exam with 3 or 4 questions on theoretical and practical issues, with at least one exercise. The exam aims at verifying a good level in CC3 and CA3 and at least sufficient in CC8 and CA8

Oral exam with 3 or 4 questions on theoretical and practical issues, with at least one exercise. The exam aims at verifying a good level in CC3 and CA3 and at least sufficient in CC8 and CA8

1. -Presentation of the course; explanation about examinations

Basic definitions: machine, kinematic chain, mechanism

-Kinematic pairs, elementary kinematic pairs (rotational, helical, prismatic) and higher kinematic pairs in the plane and in three

-dimensional space

-computation of the degrees of freedom (DOFs) of a plane mechanism (Grübler rule) and a spatial mechanism (Kutzbach rule); Bi-dimensional examples: four-bar linkage, crank, cam follower, cam follower with roller, cross connector, cross connector with ineffective auction; spatial examples: spatial four-bar mechanism with 4 revolute pairs, spatial four-bar mechanism with two revolute, a spherical and a cylindrical joint.

2. Sliding friction: Coulomb's law, friction coefficient and friction angle - Definition of boundary lubrication, hydrostatic lubrication (natural and forced) and hydrodynamic lubrication (hard and soft) - Rolling friction: definition of the rolling friction parameter and rolling friction coefficient. Friction between dry surfaces, Reye's hypothesis: push pin, flat sled.

3. Reye hypothesis: brake blocks (only evolution of the pressures on the contact surface, assuming a given direction of approach) - Definition of mechanical efficiency and loss factor – Efficiency of machines in series and in parallel with examples. Efficiency in forward and reverse motion with definition of non back-driveability .

4. Theoretical Treatment of static problems and kinetostatic - Cardinal equations of statics as a result of the dynamic equations - Rigid body subjected to two forces, two forces and a moment, three forces, three forces and a moment, four forces- Examples: four-bar mechanism and crank thrust (only ideal case).

5. Mechanical efficiency of the inclined plane; forces exchanged in a rotational joint in the ideal case, and with friction - definition of the friction circle - efficiency of the rotational joint – efficiency of the prismatic joint - efficiency of the screw-nut pair.

6. Efficiency of the screw-nut torque, direct and reverse motion - relationships between the characteristic angles of the thread - The wheel in locomotion: driven wheel, traction and braking – Example of vehicle moving on a horizontal road.

7. Kinetostatics exercise: crankshaft with friction

8. Recall kinematic circular rigid motions, rolling curve (roulette) and fixed curve in plane motions

9. Kinematic analysis of four-bar mechanisms, analytical formulation for crankshaft

10. Cams and tappets

11. Kinetostatics exercise: ideal case, case with friction.

12. Gearing, introduction to mating profiles

13. Geometry of gears with involute teeth profile

14. Definition of conjugate profiles and methods for their generation; definition of involute and evolute curves; spur gears with involute teeth: basic properties; geometric characteristics and design: pitch, normal pitch (module), etc.; conditions of continuity of the motion and of non-interference; hints on cutting gears; correction of the toothed wheels and mounting of the same; notes on the spur gears with helical teeth.

15. Ordinary and planetary gear trains with 1 DOF

16. Two-DOFs gearing: automotive differential

17. Mechanical systems with flexible organs: transmissions with belts

18. Ordinary and pulley blocks, belt brakes

19. Introduction to the theory of lubrication, deduction of Reynolds' equation starting from Navier-Stokes' ones; application to the case of the flat slide: Reynolds' equation

20. Application to the case of the flat sled: infinitely wide sled, finite width slide, infinitely narrow sled. Reynolds equation

21. Infinitely long rotational joint, finite length rotational joint, infinitely short rotational joint, Reynolds' equation and examples

22. Lubrication for juxtaposition, Reynolds' equation and examples

23. Thrust bearing, journal bearing

24. Recalls of Newtonian dynamics. Recalls of Lagrangian dynamics: non-redundant formulation

25. Lagrangian dynamics recalls: redundant formulation and examples

26. Kinematics and dynamics of crankshaft mechanism: equation of motion

27. Dynamic balancing of single-cylinder engines

28. Dynamic balancing multi-cylinder engines

Basic definitions: machine, kinematic chain, mechanism

-Kinematic pairs, elementary kinematic pairs (rotational, helical, prismatic) and higher kinematic pairs in the plane and in three

-dimensional space

-computation of the degrees of freedom (DOFs) of a plane mechanism (Grübler rule) and a spatial mechanism (Kutzbach rule); Bi-dimensional examples: four-bar linkage, crank, cam follower, cam follower with roller, cross connector, cross connector with ineffective auction; spatial examples: spatial four-bar mechanism with 4 revolute pairs, spatial four-bar mechanism with two revolute, a spherical and a cylindrical joint.

2. Sliding friction: Coulomb's law, friction coefficient and friction angle - Definition of boundary lubrication, hydrostatic lubrication (natural and forced) and hydrodynamic lubrication (hard and soft) - Rolling friction: definition of the rolling friction parameter and rolling friction coefficient. Friction between dry surfaces, Reye's hypothesis: push pin, flat sled.

3. Reye hypothesis: brake blocks (only evolution of the pressures on the contact surface, assuming a given direction of approach) - Definition of mechanical efficiency and loss factor – Efficiency of machines in series and in parallel with examples. Efficiency in forward and reverse motion with definition of non back-driveability .

4. Theoretical Treatment of static problems and kinetostatic - Cardinal equations of statics as a result of the dynamic equations - Rigid body subjected to two forces, two forces and a moment, three forces, three forces and a moment, four forces- Examples: four-bar mechanism and crank thrust (only ideal case).

5. Mechanical efficiency of the inclined plane; forces exchanged in a rotational joint in the ideal case, and with friction - definition of the friction circle - efficiency of the rotational joint – efficiency of the prismatic joint - efficiency of the screw-nut pair.

6. Efficiency of the screw-nut torque, direct and reverse motion - relationships between the characteristic angles of the thread - The wheel in locomotion: driven wheel, traction and braking – Example of vehicle moving on a horizontal road.

7. Kinetostatics exercise: crankshaft with friction

8. Recall kinematic circular rigid motions, rolling curve (roulette) and fixed curve in plane motions

9. Kinematic analysis of four-bar mechanisms, analytical formulation for crankshaft

10. Cams and tappets

11. Kinetostatics exercise: ideal case, case with friction.

12. Gearing, introduction to mating profiles

13. Geometry of gears with involute teeth profile

14. Definition of conjugate profiles and methods for their generation; definition of involute and evolute curves; spur gears with involute teeth: basic properties; geometric characteristics and design: pitch, normal pitch (module), etc.; conditions of continuity of the motion and of non-interference; hints on cutting gears; correction of the toothed wheels and mounting of the same; notes on the spur gears with helical teeth.

15. Ordinary and planetary gear trains with 1 DOF

16. Two-DOFs gearing: automotive differential

17. Mechanical systems with flexible organs: transmissions with belts

18. Ordinary and pulley blocks, belt brakes

19. Introduction to the theory of lubrication, deduction of Reynolds' equation starting from Navier-Stokes' ones; application to the case of the flat slide: Reynolds' equation

20. Application to the case of the flat sled: infinitely wide sled, finite width slide, infinitely narrow sled. Reynolds equation

21. Infinitely long rotational joint, finite length rotational joint, infinitely short rotational joint, Reynolds' equation and examples

22. Lubrication for juxtaposition, Reynolds' equation and examples

23. Thrust bearing, journal bearing

24. Recalls of Newtonian dynamics. Recalls of Lagrangian dynamics: non-redundant formulation

25. Lagrangian dynamics recalls: redundant formulation and examples

26. Kinematics and dynamics of crankshaft mechanism: equation of motion

27. Dynamic balancing of single-cylinder engines

28. Dynamic balancing multi-cylinder engines

1. -Presentation of the course; explanation about examinations

Basic definitions: machine, kinematic chain, mechanism

-Kinematic pairs, elementary kinematic pairs (rotational, helical, prismatic) and higher kinematic pairs in the plane and in three

-dimensional space

-computation of the degrees of freedom (DOFs) of a plane mechanism (Grübler rule) and a spatial mechanism (Kutzbach rule); Bi-dimensional examples: four-bar linkage, crank, cam follower, cam follower with roller, cross connector, cross connector with ineffective auction; spatial examples: spatial four-bar mechanism with 4 revolute pairs, spatial four-bar mechanism with two revolute, a spherical and a cylindrical joint.

2. Sliding friction: Coulomb's law, friction coefficient and friction angle - Definition of boundary lubrication, hydrostatic lubrication (natural and forced) and hydrodynamic lubrication (hard and soft) - Rolling friction: definition of the rolling friction parameter and rolling friction coefficient. Friction between dry surfaces, Reye's hypothesis: push pin, flat sled.

3. Reye hypothesis: brake blocks (only evolution of the pressures on the contact surface, assuming a given direction of approach) - Definition of mechanical efficiency and loss factor – Efficiency of machines in series and in parallel with examples. Efficiency in forward and reverse motion with definition of non back-driveability .

4. Theoretical Treatment of static problems and kinetostatic - Cardinal equations of statics as a result of the dynamic equations - Rigid body subjected to two forces, two forces and a moment, three forces, three forces and a moment, four forces- Examples: four-bar mechanism and crank thrust (only ideal case).

5. Mechanical efficiency of the inclined plane; forces exchanged in a rotational joint in the ideal case, and with friction - definition of the friction circle - efficiency of the rotational joint – efficiency of the prismatic joint - efficiency of the screw-nut pair.

6. Efficiency of the screw-nut torque, direct and reverse motion - relationships between the characteristic angles of the thread - The wheel in locomotion: driven wheel, traction and braking – Example of vehicle moving on a horizontal road.

7. Kinetostatics exercise: crankshaft with friction

8. Recall kinematic circular rigid motions, rolling curve (roulette) and fixed curve in plane motions

9. Kinematic analysis of four-bar mechanisms, analytical formulation for crankshaft

10. Cams and tappets

11. Kinetostatics exercise: ideal case, case with friction.

12. Gearing, introduction to mating profiles

13. Geometry of gears with involute teeth profile

14. Definition of conjugate profiles and methods for their generation; definition of involute and evolute curves; spur gears with involute teeth: basic properties; geometric characteristics and design: pitch, normal pitch (module), etc.; conditions of continuity of the motion and of non-interference; hints on cutting gears; correction of the toothed wheels and mounting of the same; notes on the spur gears with helical teeth.

15. Ordinary and planetary gear trains with 1 DOF

16. Two-DOFs gearing: automotive differential

17. Mechanical systems with flexible organs: transmissions with belts

18. Ordinary and pulley blocks, belt brakes

19. Introduction to the theory of lubrication, deduction of Reynolds' equation starting from Navier-Stokes' ones; application to the case of the flat slide: Reynolds' equation

20. Application to the case of the flat sled: infinitely wide sled, finite width slide, infinitely narrow sled. Reynolds equation

21. Infinitely long rotational joint, finite length rotational joint, infinitely short rotational joint, Reynolds' equation and examples

22. Lubrication for juxtaposition, Reynolds' equation and examples

23. Thrust bearing, journal bearing

24. Recalls of Newtonian dynamics. Recalls of Lagrangian dynamics: non-redundant formulation

25. Lagrangian dynamics recalls: redundant formulation and examples

26. Kinematics and dynamics of crankshaft mechanism: equation of motion

27. Dynamic balancing of single-cylinder engines

28. Dynamic balancing multi-cylinder engines

Basic definitions: machine, kinematic chain, mechanism

-Kinematic pairs, elementary kinematic pairs (rotational, helical, prismatic) and higher kinematic pairs in the plane and in three

-dimensional space

-computation of the degrees of freedom (DOFs) of a plane mechanism (Grübler rule) and a spatial mechanism (Kutzbach rule); Bi-dimensional examples: four-bar linkage, crank, cam follower, cam follower with roller, cross connector, cross connector with ineffective auction; spatial examples: spatial four-bar mechanism with 4 revolute pairs, spatial four-bar mechanism with two revolute, a spherical and a cylindrical joint.

2. Sliding friction: Coulomb's law, friction coefficient and friction angle - Definition of boundary lubrication, hydrostatic lubrication (natural and forced) and hydrodynamic lubrication (hard and soft) - Rolling friction: definition of the rolling friction parameter and rolling friction coefficient. Friction between dry surfaces, Reye's hypothesis: push pin, flat sled.

3. Reye hypothesis: brake blocks (only evolution of the pressures on the contact surface, assuming a given direction of approach) - Definition of mechanical efficiency and loss factor – Efficiency of machines in series and in parallel with examples. Efficiency in forward and reverse motion with definition of non back-driveability .

4. Theoretical Treatment of static problems and kinetostatic - Cardinal equations of statics as a result of the dynamic equations - Rigid body subjected to two forces, two forces and a moment, three forces, three forces and a moment, four forces- Examples: four-bar mechanism and crank thrust (only ideal case).

5. Mechanical efficiency of the inclined plane; forces exchanged in a rotational joint in the ideal case, and with friction - definition of the friction circle - efficiency of the rotational joint – efficiency of the prismatic joint - efficiency of the screw-nut pair.

6. Efficiency of the screw-nut torque, direct and reverse motion - relationships between the characteristic angles of the thread - The wheel in locomotion: driven wheel, traction and braking – Example of vehicle moving on a horizontal road.

7. Kinetostatics exercise: crankshaft with friction

8. Recall kinematic circular rigid motions, rolling curve (roulette) and fixed curve in plane motions

9. Kinematic analysis of four-bar mechanisms, analytical formulation for crankshaft

10. Cams and tappets

11. Kinetostatics exercise: ideal case, case with friction.

12. Gearing, introduction to mating profiles

13. Geometry of gears with involute teeth profile

14. Definition of conjugate profiles and methods for their generation; definition of involute and evolute curves; spur gears with involute teeth: basic properties; geometric characteristics and design: pitch, normal pitch (module), etc.; conditions of continuity of the motion and of non-interference; hints on cutting gears; correction of the toothed wheels and mounting of the same; notes on the spur gears with helical teeth.

15. Ordinary and planetary gear trains with 1 DOF

16. Two-DOFs gearing: automotive differential

17. Mechanical systems with flexible organs: transmissions with belts

18. Ordinary and pulley blocks, belt brakes

19. Introduction to the theory of lubrication, deduction of Reynolds' equation starting from Navier-Stokes' ones; application to the case of the flat slide: Reynolds' equation

20. Application to the case of the flat sled: infinitely wide sled, finite width slide, infinitely narrow sled. Reynolds equation

21. Infinitely long rotational joint, finite length rotational joint, infinitely short rotational joint, Reynolds' equation and examples

22. Lubrication for juxtaposition, Reynolds' equation and examples

23. Thrust bearing, journal bearing

24. Recalls of Newtonian dynamics. Recalls of Lagrangian dynamics: non-redundant formulation

25. Lagrangian dynamics recalls: redundant formulation and examples

26. Kinematics and dynamics of crankshaft mechanism: equation of motion

27. Dynamic balancing of single-cylinder engines

28. Dynamic balancing multi-cylinder engines