Politecnico di Torino
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Politecnico di Torino
Academic Year 2017/18
01NHJMT
Structural dynamics of aerospace structures
Master of science-level of the Bologna process in Aerospace Engineering - Torino
Teacher Status SSD Les Ex Lab Tut Years teaching
Di Sciuva Marco ORARIO RICEVIMENTO     50 30 0 0 6
SSD CFU Activities Area context
ING-IND/04 8 B - Caratterizzanti Ingegneria aerospaziale ed astronautica
Subject fundamentals
The course allows integrating the knowledge aerospace engineering students have acquired in the basic courses of structural contents, more specifically directed to provide methodologies and tools for the stress and strain analysis of statically loaded aerospace structures, with methodologies and tools for the numerical and experimental dynamic analysis of the same structures (since the loads acting on these are typically dynamic in nature).
Closely connected with dynamic analysis is the problem of control; the course will also provide the basic concepts of control and an overview of the related methodologies, highlighting critical issues and peculiarities.
To this end, the course is based on lessons, classroom exercises, application of methodologies and tools in the computer lab, and experiments carried out by students in a laboratory.
Expected learning outcomes
Ability to perform preliminary and detailed analysis about the dynamic response and control of simple aerospace structural components, to design and manage laboratory tests on them, critically correlating numerical and experimental results.
Prerequisites / Assumed knowledge
The course uses concepts, notions, and methods of the basic courses in physics and mechanics as well as elements of structural analysis (displacements, strains, stresses, equilibrium, stability).
Contents
Overview on the design and analysis of aircraft structures in the presence of dynamic loads. Tasks of the structural analysis, with particular reference to the analysis and control of the dynamic response. Origin and classification of dynamic loads on an aerospace structure. Levels of dynamic loads.
Elements of mechanical vibrations. Dynamic models for discrete and continuous structural aerospace components (systems with one or more degrees of freedom: rods, beams, plates). Transfer functions and Frequency Response Functions (FRF).
Exact and approximate solutions of the dynamic problem. Finite Element Method (FEM).
Modal analysis. Effects of damping. Response analysis: physical coordinates and modal coordinates. Transient response. Modal reduction techniques.
Experimental dynamic analysis. Introduction to the analysis of discrete signals. Standard components for laboratory tests. Dynamic similarity.
Elements of control theory. Control of structural dynamics. Active control of vibration of multilayered beams and plates.
Delivery modes
During the course, the application of concepts and methodologies will be experienced by students through classroom exercises, activities in the computer lab and at the LAQ-AERMEC "Aeromechanical Structural Systems" laboratory, Department of Mechanical and Aerospace Engineering.
Classroom exercises (9 h). Numerical examples on topics presented during lessons (Laplace and Fourier transform, approximate dynamic analysis of simple structural components, exercises for the final written test).
Computer lab (9 h). Numerical exercises with MATLAB (Dynamic analysis of discrete and continuous systems). FE model for the dynamic analysis of a typical aerospace structure.
Experimental laboratory tests at LAQ-AERMEC (9 h). Components for laboratory tests. Evaluation of FRF of a beam. Experimental modal analysis (modal identification) of typical aerospace structures and correlation with the results of the FEM analysis. Dynamics and active control of a typical structural component.
Texts, readings, handouts and other learning resources
Lecture notes provided by the teacher.

Reference books:
- M.F. Rubinstein, Structural Systems: Statics, Dynamics and Stability. Prentice-Hall, Inc., 1970.
- D.J.Ewins, Modal Testing: Theory and Practice. John Wiley & Sons Inc., 1995.
- M.I.Friswell, J.E.Mottershead, Finite Element Model Updating in Structural Dynamics. Kluwer Academic Publishers, 1996.

Assessment and grading criteria
The knowledge on the methodologies and tools acquired during the course (and the ability to use this knowledge to face the problems related to the dynamic analysis and control of aerospace structures) will be verified.
The exam consists of an oral exam (maxiumum score 30/30). The oral exam lasts about 30 minutes and usually consists of two questions asked to each candidate, one of which aimed to deepen the arguments developed in the written reports about the classroom, numerical and experimental experiences. The candidate must present at the oral exam written reports about activities and exercises developed during the course.
If the applicant write a paper selected from a list provided by the teacher, a question of the oral arguments will focus on that.

Programma definitivo per l'A.A.2016/17
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