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COMPUTATIONAL VIBROACOUSTICS

Roberto Guglielmo CITARELLA COMPUTATIONAL VIBROACOUSTICS

0622300033
DIPARTIMENTO DI INGEGNERIA INDUSTRIALE
EQF7
MECHANICAL ENGINEERING
2019/2020

YEAR OF COURSE 2
YEAR OF DIDACTIC SYSTEM 2018
SECONDO SEMESTRE
CFUHOURSACTIVITY
660LESSONS
ROBERTO GUGLIELMO CITARELLA T Curriculum
LUIGI FEDERICO Curriculum
Objectives

This course is aimed at providing the student with a basic knowledge on the vibroacustic topic, with particular reference to analysis and design of aerospace and car vehicle systems.
Specific attention will be devoted to the comprehension of noise generation and transmission in car vehicle and aircraft/spacecraft, with allowance for fluid-structure interaction. To this aim analytical and numerical approaches will be studied and applied on vibroacoustic case studies.

Prerequisites
As a prerequisite to properly benefit of the course content, the students must preliminary overcome examinations in the following propedeutic courses:
MECCANICA DELLE VIBRAZIONI, COSTRUZIONE DI MACCHINE ED ELEMENTI FINITI e FLUIDODINAMICA NUMERICA (for this exam the compliance with the requisite is optional).
Contents
Origins of aircraft/aerospace and car vehicle noise (4h Teo);
sound wave equation (4h Teo);
noise reflection and absorption, cavity resonant modes (3h Teo);
Boundary Element Method (BEM): direct and indirect formulations (6h Teo, 2h Ese);
Finite Element Method (FEM) as applied to vibroacoustic analyses (3h Teo, 2h Ese);
sound wave propagation in solids (3h Teo);
fluid structure interaction (2h Teo);
FEM/FEM e FEM/BEM coupled approaches (4h Teo, 4h Ese);
Statistical Energy Analysis (SEA) approach (6h Teo, 6h Ese);
Hybrid FEM/SEA approach (2h Teo);
Techniques aimed at improving the vibroacoustic comfort in aircraft/aerospace and car vehicles (3h Teo);
Summarize lessons (2h Teo);
Visit to Italian Aerospace Research Center (CIRA) laboratories (4h Lab).

The case studies that will be analysed during lessons include: vibroacustic analysis of a car vehicle exhaust system; trasmission loss assessment of a car firewall; acoustic sensitivity analysis on a car body; noise effects in the lift-off phase of a spacecraft launcher.
Teaching Methods
The course (6 CFU) is based on 56 hours of theoretical (42 hours) and applicative lessons (14 hours) + 4 hours devoted to laboratory training activity.

Verification of learning
The fulfillment of the course objectives will be assessed by an oral examination. During the oral examination, in addition to answering to questions concerning the topics developed during the course, the students will have to illustrate a technical project they had previously developed in a team, on a topic suggested by the teacher.
Texts
M. Harrison, Vehicle Refinement. Controlling Noise and Vibration in Road Vehicles, Elsevier.

S. M. Kirkup, The Boundary Element Method in Acoustics, Integrated Sound Software.

R. H. Lyon and R. G. DeJong, Theory and Application of Statistical Energy Analysis (Second Edition), Elsevier

Appunti forniti al corso, insieme all'intero contenuto delle slide utilizzate dal docente a supporto della lezione.
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