MECHANICAL ENGINEERING

Programma

Corso di Laurea Magistrale in Ingegneria Chimica per la Sostenibilità Industriale (LM-22)

Anno Accademico 2014 - 2015

 

CORSO DI MECCANICA PER L’INGEGNERIA CHIMICA (Cod: 91284)

 

Course teacher: Prof. Alessandro Cammarata

Room # 9 – Dipartimento di Ingegneria Industriale, Building 3.

Phone 095-7382403, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Office hours: Day: Friday from 11.00 to 13.00

OBIETTIVI

The course is divided into two parts. In the first part the basic concepts of Applied Mechanics are provided to the students while in the second one issues related to the mechanical vibrations are dealt.

 

The teaching methodology of the course consists of lectures and tutorials.

 

PREREQUISITI RICHIESTI

No Prerequisites

 

FREQUENZA LEZIONI

The student is required to attend at least 70% of the lessons, cfr. Punto 3.3 of Regolamento Didattico of CLM in Chemical Engineering for Industrial Sustainability

 

TESTI DI RIFERIMENTO

1. Funaioli E., Maggiore A., Meneghetti U., “Lezioni di Meccanica Applicata alle Macchine – Vol. 1”, Pàtron Editore.

 

2. Jacazio G., Piombo B., “Meccanica Applicata alle Macchine – Vol.2”, Levrotto & Bella Torino.

3. Diana G., Cheli F., “Dinamica e vibrazione dei sistemi”, Utet Libreria.

 

 

PROVA D’ESAME

 

 

Appelli successivi all’erogazione del corso

Written and oral examinations.

.

Modalità di iscrizione ad un appello d’esame

The reservation for an examination session is mandatory and must be made exclusively through the web portal for students within the scheduled period.

 

Date d’esame 

www.ing.unict.it

CONSEGNA MATERIALE DIDATTICO

Educational materials in electronic format delivered by the teacher during the course.

 

PROGRAMMA DEL CORSO

APPLIED MECHANICS

 

1. GENERALITY ON MECHANISMS

Machines and mechanisms, kinematic pairs, degrees of freedom of the kinematic pairs, degrees of freedom of planar and spatial mechanisms.

 

 

2. EFFICIENCY.

Definition of mechanism efficiency, in series and in parallel efficiency, inverse motion.

 

 

3. FRICTION AND WEAR.

Coefficient of friction and work, notes on the theory of sliding friction, rolling friction, friction circle. Examples: revolute pair, inclined plane. Contact pressures distribution and Reye's hypothesis. Applications: flat sliding pair, turning pair, disc brake, contact brake-pulley and brake drum.

 

 

4. GEAR WHEELS.

Friction gears, conjugate profiles, primitive and fundamental circles, definition of involute of a circle. Spur gears and relative dimensioning, determination of the arc of action, non-interference condition. Spur gears with helical teeth, determination of the arc of action. Hints on bevel gears.

 

 

5. Gearboxes.

Ordinary gearboxes, planetary gears and Willis’ formula, automotive differential. Examples and exercises on gearboxes.

 

 

6. FLEXIBLES.

Lifting devices, elastic and inelastic stiffness, friction in the pivots, lifting hoists, pulley block.

 

 

7. BELTS AND CHAINS.

Type of belts: flat, round, V-ribbed, toothed. Belt transmission between parallel axes, transmission efficiency, forcing of belts, maximum transmittable power. Ordinary and differential tape brake. Hints on the chains.

 

MECHANICAL VIBRATIONS

 

1. ONE DEGREE OF FREEDOM VIBRATING SYSTEMS: FREE OSCILLATIONS.

General information on mechanical vibrations, free elementary oscillator, equivalent systems, springs in series and in parallel. Examples.

 

2. ONE DEGREE OF FREEDOM VIBRATING SYSTEMS: DAMPED OSCILLATIONS.

Elementary damped oscillator, critical, hyper-critical and sub-critical damping, method of the logarithmic decrement. Examples.

 

3. ONE DEGREE OF FREEDOM VIBRATING SYSTEMS: FORCED OSCILLATIONS.

Elementary forced oscillator, amplification factor, Argand-Gauss plane representation with rotating vectors. Applications: Foundations, constraints displacement, seismographs and accelerometers.

 

4. ONE DEGREE OF FREEDOM VIBRATING SYSTEMS: TORSION OSCILLATOR.

Elementary torsional oscillator, trees arranged in series and parallel, reduction of the rotating masses. Examples.

 

5. TWO DEGREES OF FREEDOM VIBRATING SYSTEMS: FREE AND FORCED OSCILLATIONS.

System with two-dofs, determination of the equations of motion. Two-dofs forced system and determination of the equations of motion. Dynamic absorber.