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Politecnico di Torino
Anno Accademico 2015/16
01OGEQD, 01OGENE
Fluid power I
Corso di Laurea Magistrale in Ingegneria Meccanica (Mechanical Engineering) - Torino
Corso di Laurea Magistrale in Ingegneria Meccanica - Torino
Docente Qualifica Settore Lez Es Lab Tut Anni incarico
Rundo Massimo ORARIO RICEVIMENTO A2 ING-IND/08 42 12 6 0 11
SSD CFU Attivita' formative Ambiti disciplinari
ING-IND/08 6 D - A scelta dello studente A scelta dello studente
Presentazione
Il modulo presenta e considera componenti e sistemi oleodinamici di base in termini di architettura, caratteristiche specifiche, realizzazioni costruttive e funzionamento. Vengono introdotte le condizioni di non-idealità dei componenti, le loro caratteristiche e prestazioni. Le macchine volumetriche, nelle varie soluzioni costruttive, vengono studiate in termini di rendimenti, oscillazioni della portata e coppia istantanee e degli aspetti legati alla distribuzione. Il modulo si concentra quindi sullo studio di attuatori lineari e rotativi, sistemi di generazione della portata, accumulatori e valvole presentandone principi e soluzioni costruttive. Gli studenti apprendono le modalità di identificazione e di interpretazione dei circuiti oleodinamici, e spiegano il loro scopo con riguardo ai componenti costitutivi. Le considerazioni teoriche vengono integrate da applicazioni di Simulazione. Obiettivo primario del Corso è quello di presentare agli allievi i metodi per l'analisi e la valutazione critica di componenti e sistemi oleodinamici.
Risultati di apprendimento attesi
Al completamento del Corso gli allievi devono essere in grado di identificare i principali componenti oleodinamici, la loro funzione specifica nonchè il loro funzionamento, interpretare correttamente il loro scopo nel contesto di un sistema oleodinamico e determinare e confrontare da un punto di vista tecnico l'uso di un componente o di un intero sistema in relazione agli usi finali
Prerequisiti / Conoscenze pregresse
Sono necessarie le conoscenze derivanti dai Corsi che trattano la Fisica, la Meccanica dei Fluidi e la Modellazione 3D.
Programma
• Fundamentals of Fluid Power (5 hours).
• Positive displacement pumps and motors (10 hours): different designs, real steady-state characteristics, instantaneous flow rate and torque, volumetric and mechanical-hydraulic efficiencies, flow and torque losses models, evaluation of the displacement. Controls for displacement variation.
• Fluid Power valves (10 hours): on-off directional control valves; flow and pressure control valves, single and double stage; ideal and real performance characteristics.
• Accumulators (2 hours): types and their dimensioning criteria.
• Flow generating units (8 hours): constant and variable flow rate, for open and closed circuits; constant pressure; ideal and real performance characteristics.
• Users groups (14 hours): mechanical characteristic of linear and rotary actuators. Control of overrunning loads by means of counterbalance and overcentre valves. Flow regeneration in differential actuators. Synchronous movement of two linear actuators by means of a flow divider/combiner. Speed control of hydraulic motors with flow control valves (meter-in, meter-out, by-pass). Variable displacement motors. Hydraulic transformers.
• Basics of Load Sensing systems (5 hours): working principles with fixed and variable flow generating units, local compensators, anti-saturation compensators.
Organizzazione dell'insegnamento
Four sessions of mandatory laboratory work (1.5 hours each) are carried out in groups of students:
1. Pumps, motors and linear actuators: various positive displacement pumps and motors (external and internal gear, axial and radial piston and vane machines) of different manufacturers are disassembled, analysed and contrasted to understand and appraise their peculiarities and mode of operation.
2. Fluid Power valves: students can analyse different types of valves a such as pressure relief, pressure reducing, sequence, two and three ports flow control, piloted non-return.
3. Didactic test rig: students can analyse different circuits and components. Interactions and characteristics of valves and actuators are appraised: the practical settings of relief, reducing and sequence valves, implications in series and parallel operation of linear actuators, velocity control of rotary motor with constant and variable loads via variable restrictors and flow control valves.
4. Load test rig: the test rig reproduces the circuit of a hydraulic winch. It includes an orbital motor integrating a holding brake and an overcentre valve. The steady-state characteristic of the winch with resistant and overrunning load is measured. The main components are also dismantled and analysed.

A written report about one of the laboratory topics must be prepared and presented at the examination.
Testi richiesti o raccomandati: letture, dispense, altro materiale didattico
Slides will be progressively made available only to enrolled students on the Didactic Web Portal of the Politecnico.
The entire set of slides used in lectures in printed form will be also available at the beginning of the didactic term:
• Nervegna, N., Rundo, M.: Fluid Power I, Politeko, Torino
For additional insight into specific topics reference is made to the following material (in Italian):
• Nervegna, N.: Oleodinamica e pneumatica: Sistemi. Vol. 1, Politeko, Torino
• Nervegna, N.: Oleodinamica e pneumatica: Componenti. Vol. 2, Politeko, Torino
• Nervegna, N.: Oleodinamica e pneumatica: Esercitazioni. Vol. 3, Politeko, Torino
• Gilardino, L.: Esercizi di Oleodinamica, Clut, Torino
Some additional information (bibliography, links, animations, test rigs for lab sessions) can be found on the official web site of the Fluid Power Laboratory (http://www.fprl.polito.it).
Criteri, regole e procedure per l'esame
ASSESSMENT AND GRADING CRITERIA
During the course 5 numerical exercises will be progressively proposed on the Didactic Web Portal of the Politecnico. This homework must be downloaded and solved individually, according to explicit rules, by all students. The purpose of the homework is twofold: a self-assessment of acquired knowledge and competence; a training route toward the final written test. When successfully registering the exam, students must hand in the complete set of their own homework.
At the end of the course the final exam is grounded on a two-hour written test involving numerical evaluations on a proposed problem as well as theoretical questions on concepts and principles exposed during the lectures and laboratory sessions.
Some examples of written tests will be available on the Didactic Web Portal.
For those who reach in the written test a mark in the range:
• above 20/30 the oral examination is optional,
• from 15/30 to 20/30 an additional oral examination is required to pass the exam,
• below 15/30 the exam is failed.
In case of oral exam, the final mark will be the average between oral and written exams.
The oral exam will focus on lectures, laboratory topics and homework.
Orario delle lezioni
Statistiche superamento esami

Programma definitivo per l'A.A.2015/16
Indietro



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