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COMPUTATIONAL VIBROACOUSTICS

Roberto Guglielmo CITARELLA COMPUTATIONAL VIBROACOUSTICS

0622300033
DEPARTMENT OF INDUSTRIAL ENGINEERING
EQF7
MECHANICAL ENGINEERING
2024/2025



YEAR OF COURSE 2
YEAR OF DIDACTIC SYSTEM 2018
AUTUMN SEMESTER
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 OR CAR VEHICLE, OR MARINE SYSTEMS.
SPECIFIC ATTENTION WILL BE DEVOTED TO THE COMPREHENSION OF NOISE GENERATION AND TRANSMISSION IN CAR VEHICLE AND AIRCRAFT/SPACECRAFT AND MARINE SYSTEMS, WITH ALLOWANCE FOR FLUID-STRUCTURE INTERACTION. TO THIS AIM ANALYTICAL AND NUMERICAL APPROACHES WILL BE STUDIED AND APPLIED ON VIBROACOUSTIC CASE STUDIES.

MAKING JUDGEMENTS.
BE ABLE TO IDENTIFY THE MOST APPROPRIATE METHODS TO ANALYZE THE VIBROACOUSTIC PROBLEM.

COMMUNICATION SKILLS.
TO BE ABLE TO DESCRIBE, IN WRITTEN FORM, IN A CLEAR AND CONCISE WAY AND TO EXPLAIN ORALLY WITH PROPRIETY OF LANGUAGE THE OBJECTIVES, THE PROCEDURE AND THE RESULTS OF THE ELABORATIONS CARRIED OUT.

LEARNING SKILLS.
BE ABLE TO APPLY THE ACQUIRED KNOWLEDGE TO CONTEXTS DIFFERENT FROM THOSE PRESENTED DURING THE COURSE, AND DEEPEN THE TOPICS COVERED.
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.
HAVING STUDIED THE CONTENT OF THE COURSE NUMERICAL FLUIDODYNAMICS TURN OUT TO BE USEFUL TO BETTER APPREHEND SOME SPECIFIC PARTS OF THE COURSE.
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 35 HOURS OF THEORETICAL LESSONS, 15 HOURS OF SOFTWARE TRAINING, 5 HOURS OF SEMINARS AND 5 HOURS DEVOTED TO A VISIT TO CIRA PLANT.

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
SLIDES PROVIDED DURING THE COURSE
EVEN IF THE TOPICS COVERED ARE FULLY DESCRIBED IN THE SLIDES PROVIDED TO THE COURSE, THE STUDENT AT HIS OWN DISCRETION CAN DEEPEN THESE TOPICS BY STUDYING THE PARTS HE CONSIDERS MOST APPROPRIATE FROM THE FOLLOWING 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



More Information
SUBJECT DELIVERED IN ITALIAN.
Lessons Timetable

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