Functional Design Massimo Callegari
Basic knowledge on machine mechanics, geometry and calculus
KNOWLEDGE AND UNDERSTANDING:
The course aims to provide advanced knowledge in the field of machine mechanics so that students have the skills necessary to study machines and complex mechanical systems. In particular the students will acquire knowledge of functional analysis and design of machines and complex mechanical systems, such as machine tools, devices and robotic systems and vehicles; the class will also deal with the problems of vibrations, actuation systems and transmissions.CAPACITY TO APPLY KNOWLEDGE AND UNDERSTANDING:
The student will be able to develop kinematic, static and dynamic models of mechanisms and machines, to study their behavior by simulation and to deal with their functional design. In addition, he will develop the skills for the analysis and synthesis of machines and complex mechanical systems; he will know how to appropriately select and apply relevant analytic and modeling methods, based on the mathematical and numerical analysis, to be able simulate systems behavior in order to predict and improve its performance.TRANSVERSAL SKILLS:
The student will improve its ability to logical reasoning through the resolution of problems of analysis typical of functional design; moreover he will have the opportunity to develop its communication skills in group exercises, where he will be required to explain and support his ideas to colleagues and to the teacher
KINEMATICS AND DYNAMICS
Kinematics of multi-loop linkages and spatial chains. Linear vibrations of multi dof's systems. Bending and torsional vibrations. Rotordynamics Design of flywheels.
MECHANICAL TRANSMISSIONS AND MECHANISMS FOR MOTION GENERATION
Gearings and gearboxes. Belts and chains Linear modules Linkages. Cams. Mechanisms for intermittent motion.
Actuators for automated machinery. Servo mechanisms: drive selection, laws of motion. Closed-loop systems.
Introduction to the simulation environment. Solving of common problems in the study of the machines Modeling and analysis of simple dynamic systems.
Design process Laws and standards CAE design tools Examples of design: the I.Ca.Ro. robot Design tutorials
Parallel kinematics machines Half-car model of car dynamics Dynamic analysis and balancing of i.c.e. Design of the gearbox of a motor vehicle Torsional vibrations analysis of the driveline of a marine engine Functional design of a mechanical lift transmission
Development of the examination
LEARNING EVALUATION METHODS
The learning achievements of the students are evaluated in two or three parts:
- A written test, consisting of the solution of an exercise;
- An oral exam, consisting in the discussion of one or more topics;
- The presentation of the project of a simple mechanical system (optional).
The projects are optional and are normally carried out in groups of 2-4 students; the projects are presented by the students in one / two days specially set by the teacher at the end of the lessons. Their assessment remains valid until the beginning of the lessons of the same course in the next academic year, also in case of unsuccessful oral session.
LEARNING EVALUATION CRITERIA
To successfully pass the exam, the student must demonstrate, through the tests described above, that he/she understands the basic concepts of the lectures and especially to have acquired the basic skills of the functional design of machines and mechanisms. The assignment of the final rating takes into account the knowledge of all teaching topics. The highest rating is achieved by demonstrating a thorough understanding of lectures throughout the written, oral and design parts. Praise is reserved for students who, having played all three tests in a correct and complete way, have demonstrated the ability to investigate independently the fundamental contents of the lectures
LEARNING MEASUREMENT CRITERIA
For each of the tests indicated above a score between 0 and 30 is assigned: the score 0 corresponds to an exercise not performed or a question unanswered; the score 18 corresponds to a topic treated just sufficiently; the score 30 is given to students who demonstrate a particular brilliance in the oral presentation or in the preparation of the project; intermediate scores are assigned accordingly
FINAL MARK ALLOCATION CRITERIA
The overall evaluation is positive if the student achieves at least 16 points (out of 30) in each of the tests described above and at least 18 points (out of 30) in the overall evaluation. The overall grade, out of thirty, is given by the weighted average of the marks obtained in the tests passed, with rounding to the integer; in the case the project has been presented, the assigned weights are the following: 30% project, 30% written exercise, 40% oral discussion; if the project has not been developed, the weights are attributed as follows: 40% written exercise, 60% oral discussion.
Callegari, Fanghella e Pellicano: Meccanica Applicata alle Macchine, Città Studi, 2013.
Handouts of the course (available on the Moodle site)
- Ingegneria Meccanica (Corso di Laurea Magistrale (DM 270/04))