Vibrations and Acoustics
Basic Acoustics (4 Credit Units, 60 Credit Hours)
Syllabus: Flat acoustic waves. Spherical acoustic waves. Sound radiation of vibrating surfaces. Transmission through two or more means. Resonators and acoustic filters. Acoustics of rooms. Sound absorption. Sound propagation in ducts. Study of the mechanisms of noise generation. Methods of prediction of sound power. Absorption noise control. Enclosure and barriers. Active and reactive attenuators. Project of practical cases.
Acoustics of Internal and External Environments (4 Credit Units, 60 Credit Hours)
Syllabus: Introduction to environmental acoustics. Sound characteristics. Measurement of sound and mechanism of hearing. Noise Indices. The effect of noise on people and noise criteria. Propagation of sound in outdoor environments. Measurement of ambient noise in practice. Sound transmission. Sound absorption. Sound insulation. Impact noise. Sound indoors. Rooms for the spoken word. Rooms for music.
Analysis of Signals and Systems (4 Credit Units, 60 Credit Hours)
Syllabus: Systems: classification. Properties. Relationships between input and output of linear systems. Signs: definitions and classification. Fourier analysis: Fourier series and Fourier transform. Stochastic processes: probability distribution function, mathematical hope and statistical moments; probability density function, correlation functions and spectral density. Digital Signal Processing: Signal Analyzer, Filters, Signal Discretization, Sampling Theorem, Discrete Fourier Transform, Fast Fourier Transform (FFT), and Window Functions. Errors in estimation of frequency response functions.
Vibration Analysis in Machines (4 Credit Units, 60 Credit Hours)
Syllabus: Instrumentation for measuring vibration. Global and spectral level monitoring. Frequencies. Defective characteristics of rotating and alternate machine components. Diagnosis of defects in rotating and alternative machines. Pattern Recognition.
Statistical Energy Analysis (4 Credit Units, 60 Credit Hours)
Syllabus: Energy flow between two oscillators. Basic assumptions. Energy flow equations for composite systems. Modal density for beams type subsystems; plates and acoustic cavities. Experimental determination of the coupling factor. Structural damping. Irradiation efficiency. Estimation of the external power transferred to the system. Example of application in the box-like structure excited by a diffuse field.
Experimental Modal Analysis (4 Credit Units, 60 Credit Hours)
Syllabus: Spatial, modal and response models. Viscous and hysteretic damping mechanisms. Function Measurement Techniques Frequency Response (FRF). Analysis of the methods of extraction of modal parameters in time and frequency domain. Update of numerical models from measured data: methods of comparison, localization and correlation. Realization of tests of simple structures (Beams and Plates) and complex.
Experimental Methods in Acoustics and Vibration (4 Credit Units, 60 Credit Hours)
Syllabus: Methods of measuring the punctual impedance of structures. Structural Damping Measurement by Decay, Bandwidth, and Input Power Measurement Methods. Measurement of Transmitted Forces to Foundations and Analysis of Relative Effects of Isolators and Masses of Inertia. Transmitter Measurement of Isolators. Measurement of Sound Absorption Coefficient of Acoustic Materials using the Impedance Tube. Measurement of the Sound Power by the Sound Intensity Method. Determination of the Radiation Efficiency of Vibrant Structures.
Mechanical Vibrations (4 Credit Units, 60 Credit Hours)
Syllabus: Vibrations of linear systems with various degrees of freedom: mathematical modeling, free vibrations and response to deterministic excitations. Vibrations of continuous systems: cables, bars, beams and plates. Approximate and numerical methods: Rayleigh, Transfer Matrix and Finite Elements. Impedance of mechanical systems. Isolation of vibrations through the use of insulators and inertial mass. Dynamic vibration absorber. Dissipation of vibratory energy through structural damping. Shock control. Application to systems in general.