# Ingegneria Meccanica | COMPUTER AIDED ANALYSIS OF MECHANICAL SYSTEMS

## Ingegneria Meccanica COMPUTER AIDED ANALYSIS OF MECHANICAL SYSTEMS

cod. 0612300034

#### COMPUTER AIDED ANALYSIS OF MECHANICAL SYSTEMS

0612300034 | |

DIPARTIMENTO DI INGEGNERIA INDUSTRIALE | |

EQF6 | |

MECHANICAL ENGINEERING | |

2022/2023 |

YEAR OF COURSE 3 | |

YEAR OF DIDACTIC SYSTEM 2018 | |

SPRING SEMESTER |

SSD | CFU | HOURS | ACTIVITY | ||
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ANALISI DEI SISTEMI MECCANICI ASSISTITA DA CALCOLATORE (MODULO DI ING-IND/13) | |||||

ING-IND/13 | 3 | 30 | LESSONS | ||

ANALISI DEI SISTEMI MECCANICI ASSISTITA DA CALCOLATORE (MODULO DI ING-IND/15) | |||||

ING-IND/15 | 3 | 30 | LESSONS |

Objectives | |
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Knowledge and understanding skills: the course is aimed at providing students with the tools to understand the operation, purpose, and expected performance of mechanical devices used in engineering, ranging on different topics that can be grouped in the macro-category of machine mechanics. Reference is made to recurring industrial problems in the reference territory and in mechanical engineering in general. To this end, the course aims to critically transfer to students fundamental engineering tools in the analysis and synthesis of articulated mechanical systems. Ability to apply knowledge and understanding: the examples proposed to the course, the exercises assigned as homework, and the application cutting exercises propose repeated cues for the application of the methodologies learned in frontal lessons. After the course, students will be able to design the functional logic of a mechanical system, to analyze its dynamics, to model its parts to CAD and to interface CAD models with tools for the automatic acquisition of geometric and inertial characteristics for the simulation of dynamics and control of systems. Autonomy of judgment: the course is oriented to stimulate autonomous judgment on the comparison between engineering solutions both in the field of functional design and in the subsequent geometric and dynamic computer modeling of unconventional solutions for the typical problems of machine mechanics. Communication skills: students are required to present and discuss their solution to the problem proposed as the theme of the final exam of the current year, as well as the definition in the oral exam of the theoretical methodologies used to solve the thematic problem both in terms of the model of the dynamic system under examination, from the geometric (CAD), functional (operation, assembly, disassembly, rough sizing), and in its subsequent implementation to the computer (system simulation). Learning skills: being able to apply and update the knowledge acquired to contexts other than those presented during the course, considering technological progress. Ability to use other CAD/MBS modeling tools once the operating logic is acquired. |

Prerequisites | |
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Basic knowledge of the following subjects is required for the successful achievement of the training objectives: 1. Mechanics Applied to Machines. 2. Mechanical Drawing. 3. Fundamentals of Computer Science and Programming. |

Contents | |
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The key aspects of this course are as follows: (a) derivation of dynamic models of multibody systems, both simplified and complex, based on the writing of the motion equations of mechanical systems with few degrees of freedom and their subsequent linearization around assigned configurations and/or trajectories; (b) development in a three-dimensional computerized environment of models of constrained mechanical systems; (c) development of a corresponding multibody model consisting of a set of rigid bodies subject to any type of constraint, as well as appropriate force and force fields; (d) design of PID control laws having different degrees of complexity and their practical implementation by means of simple microcontrollers for industrial use. Students are also provided with the knowledge of basic mechanical components, methods and assembly diagrams of the components themselves (connections, joints, bearings, sprockets, etc..), their modeling through CAD systems and the logic of functional-logical modeling of complex assemblies in order to implement, on them, the laws of system dynamics and control. The duration of the course is 60 hours, of which 40 hours of theory and 20 hours of practice. 1. Introduction to the Mechanics of Multibody Systems and the Analysis and Synthesis of Mechanical Articulated Systems Assisted by Calculator. (3 hours, 3 theory + 0 exercise) 2. Linear Algebra. (3 hours, 3 theory + 0 exercise) 3. 2D and 3D rigid body kinematics. (3 hours, 3 theory + 0 exercise) 4. Static and Dynamics of 2D and 3D Rigid Bodies. (3 hours, 3 theory + 0 exercise) 5. Techniques of Derivation of the Equations of Motion and Linearization. (3 hours, 2 theory + 1 exercise) 6. Mechanical Constraints. (3 hours, 3 theory + 0 exercise) 7. Dynamics of Mechanical Bonded Systems. (3 hours, 3 theory + 0 exercise) 8. Computational Kinematics. (3 hours, 2 theory + 1 exercise) 9. Static and Computational Dynamics. (3 hours, 2 theory + 1 exercise) 10. Elements of Linear Control Theory and PID Controllers. (2 hours, 2 theory + 0 exercise) 11. Elements of Dynamic Identification Techniques. (2 hours, 2 theory + 0 exercise) 12. Programming elements in MATLAB environment. (3 hours, 0 theory + 3 exercise) 13. Introduction to SIMSCAPE. (3 hours, 0 theory + 3 exercise) 14. Elements of Design and Construction of Control Systems with Ultrasonic Sensors, DC Motors, and Inertial Platforms. (3 hours, 0 theory + 3 exercise) 15. Basic elements of machines and mechanisms. (5 hours, 3 theory + 2 exercise) 16. Mechanical constructions, connections, and systems for the transfer of mechanical energy. (3 hours, 3 theory + 0 exercise) 17. Modeling of assemblies and function tests, assembly, and disassembly. (3 hours, 3 theory + 0 exercise) 18. Design Elements of Mechanical Systems. (3 hours, 3 theory + 0 exercise) 19. Computer-Aided 3D Modeling (CAD) techniques. (3 hours, 0 theory + 3 exercise) 20. Design and development of the final draft. (3 hours, 0 theory + 3 exercise) |

Teaching Methods | |
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CLASSES IN THE CLASSROOM AND/OR AT A DISTANCE: THE LESSONS WILL BE HELD USING SLIDES AND/OR NOTES IN ITALIAN AND/OR ENGLISH. SOME LESSONS INVOLVE THE USE OF A COMPUTER AND A CAD SYSTEM. EXERCISES AND SIMULATIONS TO BE CARRIED OUT BOTH BY HAND AND COMPUTER: ABOUT 40% OF THE TIME IN THE CLASSROOM WILL BE DEDICATED TO EXERCISES AND THE SOLUTION OF PROBLEMS RELATED TO THE FINAL WORK TO BE CARRIED OUT USING A 3D CAD MODELING SYSTEM AND A MULTIBODY SIMULATION PROGRAM. LABORATORY EXERCISES WILL ALSO BE CARRIED OUT CONCERNING THE ANALYSIS OF COMPLEX MECHANICAL SYSTEMS (PARTS OF ROBOT MANIPULATORS, DC MOTORS, ETC. ...). |

Verification of learning | |
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The examination involves the discussion of a final project in place of the written test. Subsequently, there is also a mandatory oral test. Access to the oral test is not subject to passing the discussion of the final project, which, however, is compulsory in order to pass the test. The minimum grade (18/30) is achieved by demonstrating adequate knowledge of all theoretical aspects of the subject and by developing at least a complete subset of the final project. The maximum grade (30/30) is awarded to the student who demonstrates excellent knowledge of all aspects of the subject, both during the discussion of the final project and during the oral examination. Praise is awarded to the candidate with a complete and significant mastery of the theoretical and applicative contents of the course, as well as a high level of language skills, synthesis skills, autonomous processing skills, and ability to extend to industrial areas other than those taken into consideration during the course. The final evaluation of the achievement of the set objectives takes place through two consecutive steps, namely the preliminary discussion of an all-inclusive project assigned at the beginning of the course (60% of the final evaluation) and a subsequent oral examination specifically dedicated to the discussion of the theoretical part of the course (40% of the final evaluation). The final work is positively evaluated on the basis of the following aspects: the originality and versatility of the solution identified for the problem during the design phase; the methodological rigor in the definition of the problem on the model level of the dynamic system under examination; the completeness and correctness of the mechanical solutions modeled to CAD, from the point of view of functionality, assembly, and disassembly, the effectiveness and efficiency of any control algorithm implemented in the chosen solution. |

Texts | |
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Handouts: 1. Appunti delle lezioni. 2. Materiale didattico fornito dal docente. Basic books: 1. Shabana, A. A., 2009, Computational Dynamics, Fourth Edition, John Wiley and Sons. 2. Diana, G., Resta, F., 2007 Controllo di Sistemi Meccanici, Polipress. Advanced books: 1. Shabana, A. A., 2020, Dynamics of Multibody Systems, Fifth Edition, Cambridge University Press. 2. Cheli, F., Diana, G., 2015, Advanced Dynamics of Mechanical Systems, Springer. 3. Pennestrì, E., Cheli, E., 2006, Cinematica e Dinamica dei Sistemi Multibody, Volumi 1 e 2, Casa Editrice Ambrosiana. |

More Information | |
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SUBJECT DELIVERED IN ITALIAN. |

BETA VERSION Data source

**ESSE3**[Ultima Sincronizzazione: 2023-03-29]