Unit APPLIED MECHANICS
- Course
- Mechanical engineering
- Study-unit Code
- GP004974
- Curriculum
- In all curricula
- Teacher
- Maria Cristina Valigi
- Teachers
-
- Maria Cristina Valigi
- Francesco Castellani (Codocenza)
- Silvia Logozzo (Codocenza)
- Hours
- 33 ore - Maria Cristina Valigi
- 32 ore (Codocenza) - Francesco Castellani
- 15 ore (Codocenza) - Silvia Logozzo
- CFU
- 10
- Course Regulation
- Coorte 2022
- Offered
- 2022/23
- Learning activities
- Caratterizzante
- Area
- Ingegneria meccanica
- Academic discipline
- ING-IND/13
- Type of study-unit
- Obbligatorio (Required)
- Type of learning activities
- Attività formativa monodisciplinare
- Language of instruction
- Italian
- Contents
- 1)ROTORDYNAMICS
2) KINEMATICS OF MECHANISMS
3) BALANCING OF MECHANISMS
4) LUBRICATION THEORY, MECHNICAL SEALS
5) COUPLING OF MOTORS AND USERS THROUGH MECHANISMS, TRANSIENT REGIMES
6) GEARMOTORS, VARIABLE SPEED GEARMOTORS, BALL SCREWS
7) WEAR EVALUATION METHODS
8) DESIGN AND ANALYSIS OF HYDRAULIC AND PNEUMATIC SYSTEMS
9) ANALYSIS AND APPLICATION OF VISCOUS SHOCK ABSORBERS
10) MECHANICAL CONTROL SYSTEMS
11) ANALYSIS AND NUMERICAL MODELING OF NON-LINEAR MECHANICAL SYSTEMS - Reference texts
- macchine
di Massimo Callegari , Pietro Fanghella , Francesco Pellicano
-Rabie, M. G. (2009). Fluid power engineering (Vol. 28). New York, NY, USA: McGraw-Hill.
-Lecturer's notes - Educational objectives
- -To provide tools to understand, the kinematic and the dynamics of the rigid and flexible bodies machines, with related problems.
-Understand and solve the equations of motion for the main mechanical systems commonly used in the machines.
-Fundamental knowledge for design of machine components using numerical methods.
- Study and analysis of the most common drive systems used in machines.
- Gain the skills for design and study hydraulic and pneumatic power systems - Prerequisites
- Prerequisites for attending the subject are a basic knowledge of applied mechanics, and the ability to write the dynamic equilibrium equations of the mechanical systems.
Basics of computer programming. - Teaching methods
- Lectures and numerical exercises
- Other information
- Attending students have the possibility of examination in itinere.
- Learning verification modality
- Numerical solution of a problem – Oral examination
- Extended program
- ELEMENTS OF KINEMATICS OF RIGID BODIES.
• Kinematics of mechanisms.
• Linkages.
DYNAMIC ANALYSIS OF MACHINES
• Total and partial balancing of mechanisms.
• Direct dynamics of the slider-crank mechanism.
• Forces to the ground: couples, rotating forces, alternating forces. Balancing of the forces to the ground: example on the single slider-crank mechanism
• Kinetic energy of the slider-crank mechanism. Energy of rotating and alternating masses.
• Reduced moment of inertia. Reduced moment of rotating and alternating masses.
ROTOR DYNAMICS
• Ideal and real rotors
• Static and dynamic imbalance
• Flexional vibrations in rotors
• Jeffcott rotor
• Critical velocity, alignment and self-centering
• Rotor balancing on two plane.
THE THEORY OF LUBRICATION
• Deduction of Reynolds' equation starting from Navier-Stokes' ones; application to the case of the flat slide: Reynolds' equation
Application to the case of the flat sled: infinitely wide sled, finite width slide, infinitely narrow sled. Reynolds equation
Infinitely long rotational joint, finite length rotational joint, infinitely short rotational joint, Reynolds' equation and examples. Lubrication for juxtaposition, Reynolds' equation and examples.
• Thrust bearing, journal bearing, mechanical seals.
COUPLING OF MOTORS AND USERS THROUGH MECHANISMS.
• Study of transient regimes with different transmission systems.
GEARMOTORS, VARIABLE SPEED GEARMOTORS, BALL SCREWS
• Functional study
WEAR EVALUATION METHODS
APPLICATION OF HYDRAULIC AND PNEUMATIC SYSTEMS
• hydraulic systems valves and power units
• Design of servo-actuators
• Introduction to pneumatic systems
ANALYSIS AND APPLICATION OF VISCOUS SHOCK ABSORBERS
• General characteristics and design of mechanical dampers
• Tuning and control of damping systems in mechanical applications
MECHANICAL CONTROL SYSTEMS
• theoretical introduction
• numerical analysis for control systems
ANALYSIS AND NUMERICAL MODELING OF NON-LINEAR MECHANICAL SYSTEMS
• Non-linear mechanical systems dynamics
• Numerical simulation of non-linear systems with examples