CODE 60141 ACADEMIC YEAR 2024/2025 CREDITS 6 cfu anno 2 INGEGNERIA MECCANICA - ENERGIA E AERONAUTICA 9270 (LM-33) - GENOVA 6 cfu anno 2 INGEGNERIA MECCANICA - PROGETTAZIONE E PRODUZIONE 9269 (LM-33) - GENOVA SCIENTIFIC DISCIPLINARY SECTOR ING-IND/13 LANGUAGE Italian TEACHING LOCATION GENOVA SEMESTER 2° Semester MODULES Questo insegnamento è un modulo di: MECHANICS OF VIBRATION AND STRUCTURAL FEM DESIGN TEACHING MATERIALS AULAWEB AIMS AND CONTENT LEARNING OUTCOMES Qualitative and quantitative understanding of linear dynamic systems obtained by lumped-mass modeling or finite element modeling. Ability to design mechanical components and structures subject to vibrations. Ability to design damping and insulation systems. Ability to carry out dynamic measurements and identification of linear systems Understanding of limits of linear modeling and basic knowledge of some nonlinear phenomena. Ability to analyze mechanical systems with rotating components. SYLLABUS/CONTENT Dynamics of discrete mechanical systems Equations of motion, modal analysis, frequency domain representation (FRF), state space representation, numerical integration, discrete time models. Dynamic substructuring, component-mode synthesis, Craig-Bampton method Notes on the response of nonlinear systems (bifurcation, jump, limit cycle) Instability, divergence, flutter Dynamic response of linear systems with random forcing Review of probability theory, stationary random processes, PSD, self- and cross-correlation, coherence Stationary linear response (spectral analysis), maximum response value, expected frequency, peak factor Dynamics of rotors and rotating elements Free lateral response of rigid rotors on flexible supports, Campbell diagram, synchronous and non-synchronous forces Linear vibrations of elements subject to centrifugal forces (rotor blades), stress stiffening, spin softening Dynamic properties of structures with cyclic symmetry (rotor discs) Vibration measurement and dynamic identification Review of measurements (AD conversion, sampling, quantization), discrete Fourier transform, aliasing, leakage, windows. PSD and FRF estimate. Experimental modal analysis. Modal identification principles and algorithms, parameterizations of the dynamic system. Operational modal analysis. Structural integrity monitoring tools. Trend identification, envelope estimation (Hilbert transform), identification of pure tones (spectral kurtosis). RECOMMENDED READING/BIBLIOGRAPHY Fundamentals of Structural Dynamics. Roy R. Craig, Andrew J. Kurdila Dynamics of Rotating Machines. Michael I. Friswell, John E. T. Penny, Seamus D. Garvey, Arthur W. Lees Modal Testing: Theory, Practice and Application. D. J. Ewins Lecture notes TEACHERS AND EXAM BOARD LUIGI CARASSALE Exam Board LUIGI CARASSALE (President) MASSIMILIANO AVALLE FLAVIA LIBONATI (President Substitute) ABDELHAKIM BOURAS (Substitute) FLAVIA CARONNA (Substitute) MATTIA FRASCIO (Substitute) DAVIDE IAFFALDANO (Substitute) LUDOVICO MUSENICH (Substitute) ALESSANDRO REBORA (Substitute) ALESSANDRO STAGNI (Substitute) LESSONS LESSONS START https://corsi.unige.it/en/corsi/9269 Class schedule The timetable for this course is available here: Portale EasyAcademy EXAMS EXAM DESCRIPTION Oral discussion ASSESSMENT METHODS Evaluation of knowledge and clarity of presentation through the discussion of the topics covered Exam schedule Data appello Orario Luogo Degree type Note 13/01/2025 09:00 GENOVA Esame su appuntamento 14/02/2025 09:00 GENOVA Esame su appuntamento 03/06/2025 09:00 GENOVA Esame su appuntamento 30/06/2025 09:00 GENOVA Esame su appuntamento 08/09/2025 09:00 GENOVA Esame su appuntamento