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CODE 60141
ACADEMIC YEAR 2024/2025
CREDITS
SCIENTIFIC DISCIPLINARY SECTOR ING-IND/13
LANGUAGE Italian
TEACHING LOCATION
  • GENOVA
SEMESTER 2° Semester
MODULES Questo insegnamento è un modulo di:
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

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

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