Corso di laurea magistrale - Area di Ingegneria - Accesso libero con verifica del possesso dei requisiti curriculari - Classe LM-33 (D.M. 270/2004)
Descrizione e obiettivi formativi
Il corso offre una preparazione specialistica rispetto allo studio dei principi di funzionamento ed alla progettazione di componenti meccanici, di macchine e sistemi complessi, di impianti e processi industriali. Viene inoltre affrontato il tema dell’automazione dei processi e delle tecniche di monitoraggio per i sistemi meccanici e gli impianti industriali. In linea con le esigenze dello sviluppo sostenibile grande attenzione viene spesa per la valutazione dell’impatto delle soluzioni ingegneristiche riguardanti i sistemi meccanici nel contesto sociale e fisico-ambientale. Tra gli obiettivi metodologici, la progettazione meccanica assistita, la progettazione di macchine, sistemi meccanici, termomeccanici e meccatronici con tecniche innovative che integrino la sperimentazione con lo studio teorico e la simulazione, lo sviluppo e la gestione dei processi industriali convenzionali e innovativi. In tutti i casi l’obiettivo formativo principale è l’acquisizione di capacità critiche e di autonomia di azione nel campo dell’ingegneria meccanica e nei vari settori che la caratterizzano.
Il percorso formativo prevede, accanto agli insegnamenti che approfondiscono gli aspetti teorico-scientifici, una importante attività di progettazione e ricerca, che si conclude con un elaborato (tesi) che dimostra la padronanza degli argomenti, la capacità di operare in modo autonomo e un buon livello di capacità di comunicazione.
Sbocchi professionali
Sia nella libera professione che nelle imprese manifatturiere o di servizi e nelle amministrazioni pubbliche, il laureato magistrale in Ingegneria Meccanica lavora tipicamente negli ambiti della ricerca di base e applicata, dell’innovazione di prodotto e di processo, dello sviluppo della produzione, della progettazione avanzata, della pianificazione e della programmazione, della gestione di sistemi complessi.
Il laureato magistrale è in grado di svolgere differenti funzioni in contesti caratterizzati da un elevato livello di innovazione e da un respiro internazionale. Tra queste di particolare interesse la progettazione di sistemi meccanici, la progettazione e la realizzazione di processi produttivi e di impianti industriali, la direzione e la conduzione dei processi produttivi, la gestione ed il controllo degli impianti. Per l’articolazione dei corsi e la possibilità di specializzazione che è possibile acquisire lo sviluppo e la gestione dell'innovazione di processo e di prodotto sono attività particolarmente adatte al laureato magistrale in Ingegneria Meccanica, sia all’interno di realtà produttive sia nel campo specifico della ricerca e sviluppo.
Condizione occupazionale (indicatori di efficacia e livello di soddisfazione dei laureandi):
http://statistiche.almalaurea.it/universita/statistiche/trasparenza?CODICIONE=0580207303400001
Valutazione della didattica - Studenti
Anno accademico precedente
Riferimenti web e contatti
Sito Web: http://www.ingegneriameccanica.uniroma2.it/
Coordinatore: Prof. Stefano Cordiner
E-mail: cordiner@uniroma2.it
Segreteria didattica:
Sig.ra Anna Mezzanotte
Tel: 06 7259 7156
E-mail: anna.mezzanotte@uniroma2.it
Per ulteriori informazioni consulta anche il sito web di Facoltà:
http://ing.uniroma2.it/didattica/corsi-di-laurea/
1 Fundamentals of fluids: Definition of a fluid, fluid as a continuum system, stresses and viscosity. Quantities and their units equations of state and thermodynamic variables. 2 Statics and kinematics of fluids: Equilibrium of a fluid at rest (compressible and incompressible), Archimede's principle and Stevin law, Standard atmosphere (pressure transducers). Lagrangian and Eulerian description, material derivative. Trajectories, streamline and streaklines. 3 Dynamics of fluids and conservation equations: Material and control volumes, Reynolds transport theorem, conservation of mass, momentum balance and energy conservation (integral and differential forms). 4 Exact solutions of thei Navier-Stokes equations: Plane solutions: Flow between flat and parallel plates, palne Couette flow. Hagen-Poiseuille flow. 5 Bernoulli equation: Bernouilli equation and its applications (Venturi and Pitot tubes). 6 Boundary layer: Phoenomenology of boundary layer, Prandtl equations, integral equation of the boundary layer. Boundary layer separation, prassure losses. 7 Fluid dynamic loads and similitudes: Forces and force coefficients, viscous and pressure drags, Buckingham Pi theorem, dimensional analysis and dynamic similitude. Distributed and concentrated losses.
Thermodynamics Thermometry. Second principle of Thermodynamics. Mechanical work: closed and open systems, irreversible processes. Heat pumps. Open systems. Specific heats. Free energy and enthalpy. Maxwell equations. Change of state. Exergy and chart Exergy-Enthalpy. Gouy-Stodola theorem. Real gases. Virial equation. Compressibility factor. Van Deer Waals equation. Thermodynamic functions for real gases. Diesel, dual, Stirling, Joule and Ericsson engines. Steam plants. Binary cycles. Cogeneration and trigeneration. Magneto-Hydro-Dinamics plants. Thermoelectric generators. Refrigeration plants. Absorption plants. Refrigeration thermoelectric plants. Thermal and fluid dynamics Flow lines. Laminar and turbulent flow. Flow between two paralle plates and Couette flow. Distributed and concentrated flow losses. Steady flow and discharge from containers. Euler equation. Unsteady flow in container. Viscosity measurements. Flow with variable density. Compressible flow, pressure waves and sound velocity. Stagnation. Measurements of temperature, pressure and density at the stagnation. Nozzles. Hugoniot equation, velocity and mass flow rate. Heat transfer Conduction with variable properties. Conduction in two phase media and various geometries. Heat conduction in permeable wall. Unsteady state conduction in container with non negligible heat capacity. Semi-infinite wall. General heat conduction equation. Similarity variable. Non-Fourier heat conduction. Unsteady state conduction in an infinite body, welding and interfacial temperature. Melting and solidification. Thermal radiation. Grey bodies with absorbing gas. Thermal radiation and heat conduction. Heat convection. Mass amd momentum conservation equations. Blasius solutione, without pressure gradient. Energy conservation equation. Natural convection.
- Basic notions and remarks on the Mechanics of Solids and Structures (2 hours) - Elastic cables and stays for structural applications (7 hours) - Secondary torsion in thin-walled beams (4 hours) - The technical 3D theory for beams (3 hours) - Constitutive symmetries and anisotropy (4 hours) - Linear homogenization for heterogeneous materials: analytical approaches and computational methods (7 hours) - Fiber-reinforced composite materials; the laminate theory (3 hours) - Linear mechanics of unconventional materials (shape-memory alloys, piezoelectric materials) (2 hours) - Basics of palsticity (8 hours) - Linear fracture mechanics (10 hours) - Elements of damage theories (6 hours) - Stability of the equilibrium: introduction and analysis of Eulerian and non-Eulerian problems (4 hours)
Quenching and martensitic transformation in the system Fe-C. TTT and CCT diagrams, effect of the alloying elements on the transformation temperatures and on the mechanical properties. Martensitic transformation stress-assisted and straind-induced. Jominy test. Steel properties modifications as a function of the tempering temperature. Annealing, normalizing and recrystallization. Stainless steels (ferritic, martensitic and austenitic), Schaeffler diagram: steel choice according to the application. HSLA, Dual Phase and their use for structural applications. Ultra steels and innovative thermomechanical treatments. Superelastic and shape memory behavior: Ti-based and Cu-based alloys and their applications (temperature sensors, actuators, reversible couplings). Diffusion, Fick laws and diffusive transformations. Precipitation hardening in Al alloys for applications in aeronautical and automotive field. Superalloys, intermetallics and other materials with ordered structure for applications at high temperature. Thermomechanical treatments (ausforming, isoforming) and surface treatments: nitriding, case-hardening, surface coatings (CVD, PVD, etc.), shot-peening, treatments for gears, bearings, brake discs, valves, rotors. Laboratory exercises Thermal treatments: quenching, tempering, annealing and normalizing. Optical microscopy, scanning electron microscopy and hardness tests will be employed in order to evaluate the mechanical properties of some steels after quenching, tempering, annealing and normalizing. Mechanical behavior of shape memory alloys.
Industrial sustainability. Manufacturing systems and environmental issues. Design for the Environment. Lyfe-Cycle Analysis. Organization, management and improvement of manufacturing systems. Manufacturing systems evaluation. Environmentally conscious manufacturing. Air quality and environmental impact assessment in manufacturing. Technologies for recycling. Disassembly. Industrial energy efficiency.
The course will consist of the following contents: - General part: 1) Knowledge of the basic rules of the property collateral and the peculiarities of the crisis for the firm. Insolvency: historical evolution and framework of the current system; crisis and insolvency; 2) voluntary arrangements; 3) bankruptcy proceeding; 4) administrative proceedings (outlines); 5) proceedings for the resolution of the crisis by over-indebtedness (outlines). - Special Section: 1) the financing of the firm in crisis; 2) the temporary business management during the bankruptcy proceedings.
Non presente
Introduction and basic scientific elements of Physics and Chemistry. Physical Chemistry of solid surfaces at nanoscale limit. Zero-dimensional nanostructures: Nanoparticles. One-dimensional nanostructures: nanowires and nanorods. Two-dimensional nanostructures: thin films. Synthesis procedures: Bottom-up and Top-down. Self-assembling methods. Physical and chemical techniques for nanostructure fabrication. Characterization methods: morphological, chemical and physical. Innovative properties at the nanoscale level and industrial application fields. Compatibly with time availability and number of students some experimental experiences in laboratory on specific topics will be carried out .
Introduction: Non-conventional technologies. Non-conventional processes: Water and abrasive water jet. Chemical machining. Electro-chemical machining. Electron beam machining. Ultrasonic machining. Electrical discharge machining. Laser sources and processes. Plasma processes. Additive manufacturing. Polymeric materials: Properties. Extrusion. Injection moulding. Blow moulding. Rotational moulding. Thermoforming. High performance polymers. Composite materials: Polymeric matrix composites. Structure and properties. Manufacturing technologies: Automatic processes. Characterization. Innovative materials: Cellular materials. Nano-materials. Smart materials and shape memory materials. Aesthetic technologies and surface engineering.
Operations Management performance indicators OEE and its reduction Management and improvement of manufacturing processes Lean approaches Maintenance Safety
http://didattica.uniroma2.it/docenti/curriculum/5136-Angelo-Spena
Effect of the deformation rate in plastic deformation at high and low temperature of metals with different crystal lattice. Deformation under explosion. Constitutive equation and workability window. Creep: microstructural aspects and improvement of the mechanical behavior. Criteria for the choice and the development of materials with good creep resistance. Superplasticity. Fatigue: microstructural aspects and improvement of the mechanical behavior. Effect of both creep and fatigue. Ti alloys, Ti composites with long-fibre and Ni superalloys for aeronautical and aerospatial applications at medium and high temperature. Metallic materials for low temperature. Embrittlement: causes and remedies. Metal foams. Metallic materials amorphous and nanostructured. Normative about the general requirements for the competence of the test laboratories (UNI EN ISO 17025).
This course addresses fundamental legal issues of competition in the EEC and in Italy: Regulation of private and public undertakings, Antitrust Law, and Intellectual Property Law. More information: http://didattica.uniroma2.it
THERMODYNAMIC PROPERTIES OF FLUIDS Thermodynamic properties of working fluids (gases, gas mixtures, vapors, liquids) for applications in fluid machines, heat exchangers and energy systems in general. Use of software tools for the evaluation of thermodynamic properties. Combustion: thermodynamic properties of the most important fuels and of combustion products. TURBOMACHINERY Velocity triangles, stage reaction and work output, design considerations for axial and radial-flow turbines and compressors. Steam turbines: efficiency, expansion line, seals; multistage turbine layout; applications. Gas turbines: layout, design considerations on compressor and turbine; applications. Compressors: mono- and multi-stage machine layout; applications. HEAT EXCHANGERS AND STEAM GENERATORS Fundamentals about heat exchanger design, with particular reference to steam power plant components: deaerator, feedwater heaters, condenser. Steam generators: layout, operating parameters and performance of fossil boilers and heat recovery steam generators. OFF-DESIGN BEHAVIOR OF COMPONENTS AND SYSTEMS Fluid dynamic similarity criteria applied to the design of full-scale and prototypes of machines and heat exchangers. Dimensionless parameters. Corrected parameters. Operating parameters and performance curves of machines and heat exchangers. Off-design behaviour analysis of machines (turbines, pumps, compressors) and heat exchanger systems (condenser, feedwater heater, steam generators). Off-design behaviour and control of power plants: applications to gas turbines and steam power plants. Model and simulation of the dynamic behaviour of components and systems in Simscape.
Fundamental equations Conservation of mass and momentum. Stress tensor symmetry. Newtonian fluids constitutive relation. Navier Stokes equation for incompressible flows. Boundary conditions. Navier condition and slip length. Dimensionless form of the Navier-Stokes equations. Reynolds number. Stokes equation, linearity and symmetries. Notes on Purcell's theorem concerning the swimming of microorganisms. Poiseuille flow. Brownian Motion Diffusion of particles in a fluid. Conservation equation. Langevin equation for the motion of a single colloid. Fluctuation-dissipation theorem. Numerical methods for stochastic differential equations. Electrohydrodynamics Complete system of equations for transporting charged species. Poisson-Boltzmann equation. Debye length. Ideal electroosmotic flow in a plane channel. Electroosmotic flows in nanopores. Applications for biosensors and blue energy. Surface and dynamic tension of the interfaces Definition of surface tension. Laplace equation. Young's equation and contact angle. Cassie and Wenzel states. Jurin's law. Capillary length. Taylor-Rayley instability. Overview on continuous models for two-phase flows (Continuum force model). Atomistic simulation techniques. Turbulence Description in Fourier space. Production, transfer and dissipation of turbulent kinetic energy. Kolmogorov theory for homogeneous and isotropic turbulence. Kolmogorov scale. Reynold-averages equations.
Lectures will cover the following topics: 1. Introduction to Additive manufacturing (AM) The philosophy of layer manufacturing and its economic justification; Classification of AM techniques; The economic reasons behind the diffusion of AM techniques; applications and future trends. 2. AM techniques and polymers for the production of components of polymeric components Introduction on polymers; consolidation and properties of polymers processed by AM; Vat photopolymerization process and polymers; material extrusion based AM processes and polymers ; powder bed AM processes (Selective laser sintering & Multi Jet Fusion) and polymers; consolidation and properties of polymers processed by AM 3. AM techniques and metals for the production of components of metal components Raw metallic materials for AM: powder production and characterisation, Powder Bed Fusion processes (selective laser melting, electron beam melting, etc.); Directed Energy Deposition (laser metal deposition, electron beam additive manufacturing, joule printing, etc.); Material Extrusion (atomic diffusion AM, bound metal deposition) and Binder Jetting. Microstructure and properties of aluminium alloys for AM; Microstructure and properties of steels for AM.Microstructure and properties of titanium for AM; Microstructure and properties of nickel alloys for AM; Microstructure and properties of Metal Matrix Composites (MMCs) 4. Design for Additive Manufacturing Optimization of part design through numerical techniques (topology optimization and generative design); Part orientation and support structures; Manufacturing requirements and specifications 5. Integration with conventional processes for the finishing of metallic components produced by means of additive manufacturing. The training will focus on the Design for Additive Manufacturing (DFAM) approach that will be applied for the definition of the shape of components in polymeric/metallic materials. In addition, lab activities will be proposed for powder characterisation, analysis of PSD flowability, porosity and cracks of bulk samples, and microstructural characterisation.
