OIL HYDRAULIC SYSTEMS
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- Versione italiana
- Academic year
- 2017/2018
- Teacher
- MASSIMO MARTELLI
- Credits
- 6
- Didactic period
- Secondo Semestre
- SSD
- ING-IND/08
Training objectives
- Fluid power is a multidisciplinary subject integrating elements of mechanics, fluid-dynamics and controls. Furthermore, fluid power is one of the basic technologies for power transmission and it is applied to countless fields, from automotive to earth moving, agricultural and lifting or special machines, from aerospace to naval applications, to fixed applications such as automatic manufacturing machines.
The objective of the course is to provide the competence in the architectures and operating principles of hydraulic systems, providing both the base knowledge of hydraulic components and the design principles for hydraulic control architectures (circuits). This expertise is aimed at providing the necessary competence to break into the production world, especially in the above mentioned fields. Prerequisites
- To undertake the course it is highly recommended to have attended and gained understanding of the topics covered in the courses of “Fisica Tecnica” and “Macchine”.
Course programme
- The course includes 56 hours of lecture, 2 hours of workshop, 2 hours of visit at IMAMOTER - CNR labs. The topics of the lectures are the following:
1) Introduction to fluid power; main parameters for hydraulic power transmission; equations and basic principles of fluid power; nomenclature and symbols. (6 hours)
2) Introduction to basic components; pumps and motors; cylinders and valves; Power Port models; mathematical models for hydraulic components. (7 hours)
3) Supply groups; single/multiple pump group; pressure and flow control valves. (8 hours)
4) Linear actuators; functional characteristics and applications; braking of hydraulic actuators; overcentre valves; regeneration. (8 hours)
5) Load Sensing supply group; multiple actuators; motion synchronization. (6 ore)
6) Rotational actuators (hydraulic motors); Wilson efficiency models; hydrostatic transmissions (closed circuit). (9 hours)
7) Flow forces; Axial and radial balance of spool valves; servovalves. (6 hours)
8) Hydraulic fluids; piping; contamination control; filtration. (6 hours)
9) Workshop by an industry professional on working experiences in the fluid power field. (2 hours)
10) Visit at IMAMOTER - CNR labs. (2 hours) Didactic methods
- The course is structured as follows:
• lectures (56 hours);
• workshop by an industry professional (2 hours);
• visit at IMAMOTER - CNR labs (2 hours). Learning assessment procedures
- The final test is an oral exam for the verification of the level of accomplishment of the above mentioned educational objectives.
Reference texts
- Recommended books
- Zarotti G.L. – Circuiti Oleodinamici
- Watton J. – Fundamentals of Fluid Power Control, Cambridge University Press, UK
Further study books:
- Nervegna N. - Oleodinamica e Pneumatica - Vol. 1: Sistemi, Vol. 2: Componenti, Vol. 3: Esercitazioni - POLITEKO, May 2003
- Merritt H.E., Hydraulic Control Systems, John Wiley & Sons
- Speich H., Bucciarelli A. - Manuale di Oleodinamica - Ed. Tecniche Nuove
Other teaching material
Notes from previous fluid power courses, “Appunti dal Corso di Oleodinamica” by R. Paoluzzi, G.L. Zarotti, are available in pdf format at www.imamoter.cnr.it/oil_hyd_sys.php
