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Costruzione di Macchine (M/Z)
Machine Design
Marco Sasso

Seat Ingegneria
A.A. 2016/2017
Credits 9
Hours 72
Period I
Language ENG

Prerequisites
Basic knowledge of the mechanics of materials and solids, and of the dynamic and kinematic of rigid bodies.

Learning outcomes
KNOWLEDGE AND UNDERSTANDING:
The course enables students to acquire knowledge on the main criteria for the selection, verification and design of technical solutions of mechanical systems and components. This knowledge, by integrating the knowledge gained in the courses of solid mechanics, applied mechanics and mechanical technology, will provide the insights of design methodologies, so that the student acquires knowledge of the broader context of mechanical and industrial engineering, with a clear reference to the aspects concerning materials, structural mechanics, machines and production technologies.
CAPACITY TO APPLY KNOWLEDGE AND UNDERSTANDING:
The student acquires the ability to use appropriate techniques and tools to solve engineering problems that concern the analysis and design of machine components or simple mechanical systems. This capacity is expressed through professional skills, such as: 1. the ability to identify structural solutions suitable to achieve the expected performance, both using consolidated architectures and introducing innovative elements; 2. the ability to identify and apply the most suitable calculation methods for the analysis and the design of the mechanical components; 3. the ability to appropriately select materials and manufacturing technologies for the realization of mechanical components; 4. the ability to choose standard components from the catalogues for the design of simple mechanical systems
TRANSVERSAL SKILLS:
The solution of exercises and simple structural problems carried out during the lessons helps to improve both the ability to select relevant information and the degree of independent judgment. Moreover, in the discussion the student exercises the ability to communicate information, ideas, and solutions with adequate technical language

Program
The course consists of two parts: the first is devoted to the mechanics of materials, observed by the mechanical designer's point of view; the second part reviews the major machine components, with illustrations of the main relationships and procedures for design and verification. Outline of engineering materials and on the main items of interest for the mechanical designer; concept of damage of a mechanical component and safety factor; the concept of equivalent stress; the contact stress: the Hertz theory; the phenomenon of elastic instability; analysis of the fatigue behavior of materials; procedures for design and verification of components subject to high cycle fatigue; models of cumulated damage in load variability conditions. Thin wall pressure vessels; axes and shafts; keying systems: sticks, tabs, splines; gear units: spur gears and helical gears, bevel gears; power transmission by flat and V-belts; bending and torsion springs; radial, axial and angular contact bearings; disassembling joining: bolts; fixed joining: notes on welds calculation according to UNI-EN 10011.

Development of the examination
LEARNING EVALUATION METHODS
This is assessed through written and oral test. In the written examination, students must address structural verification or design problems of components or simple mechanical systems, with the aid of methods, mathematical models and tools discussed during the lectures. In the oral exam the student is asked to present the main concepts and theoretical bases of machine design, answering questions or discussing his written report.

LEARNING EVALUATION CRITERIA
In the examination the student must demonstrate the ability to use independently and correctly, the methodologies, models and tools of mechanical design presented during the lessons; furthermore, the student must demonstrate sufficient ability to judge, select, synthesize and clearly present ideas, concepts and construction solutions related to machine design.

LEARNING MEASUREMENT CRITERIA
It Is evaluated the student's independent ability to set and solve problems that he is aksed to face. Also, it is evaluates the ability to correctly use the methodologies, the models and tools of mechanical design.

FINAL MARK ALLOCATION CRITERIA
The maximum mark, equal to thirty points with laud, is awarded to students who demonstrate, in the two tests, full autonomy to set and solve problems and close acquaintance with the methods, models and tools of mechanical design. The minimum mark, equal to eighteen, is assigned to students who demonstrate to succeed the problems they are asked to face and sufficient knowledge of the methods, models and tools of mechanical design.

Recommended reading
"Shigley's Mechanical Engineering Design", McGraw-Hill; lessons notes available on Moodle platform.

Courses

• Ingegneria Meccanica (Corso di Laurea Triennale (DM 270/04))