OVERVIEW

According to the Learning outcomes and to the Syllabus (see links below), the course aims at proving the basic information about:

Noise generation from fluid machines,

Effects of noise on human beings, and

Aerodynamic noise reduction methods.

Basic information on Physical acoustics and signal processing is also provided, which is necessary for comprehension of the above listed contents.

LEARNING OUTCOMES

The course aims at providing the basic information about: - Noise generation from fluid machines, - Effect of noise on human beings, and - Aerodynamic noise reduction methods. Basic information on Physical Acoustics and signal processing is also provided, which is necessary for comprehension of the above listed contents.

AIMS AND LEARNING OUTCOMES

With reference to turbomachines and propellers employed in aeronautical propulsion systems, the student, through participation to classes and individual study, will

know the effect of the various kinds of noise on the human beings,

understand the origin of the generated aerodynamic noise,

know the physical properties of the noise generating mechanisms,

know the theoretical bases of the aerodynamic noise reduction,

be able to set measurements of the sound pressure level, and

be able to interpret the results of measurements of sound pressure level and of its power spectrum.

Teaching methods

Theoretical and applied lectures

SYLLABUS/CONTENT

Basic principles of Physical acoustics and Psychoacoustics

Measurements techniques for sound pressure level and method for the analysis of experimental results

Elementary acoustic sources and wave propagation in ducts

Study and properties of the aerodynamically generated noise (Lighthill and Ffowcs-Williams Hawkings equations): noise generated by turbulence, jets, and interaction of fluid flow with solid bodies. Applications to turbomachines, propellers, and jet engines.

Laboratory classes.

RECOMMENDED READING/BIBLIOGRAPHY

Lecture notes available at https://dime.aulaweb.unige.it/course/search.php?search=aeroacustica

S.W. Rienstra e A. Hirschberg, An Introduction to Acoustics, Eindoven University of Technology

A. Hirschberg e S.W. Rienstra, An Introduction to Aeroacoustics, Eindoven University of Technology

Exam Board

ANDREA CATTANEI (President)

MARINA UBALDI

DANIELE SIMONI

ALESSANDRO DOTTO

PIETRO ZUNINO

EDWARD CANEPA

FRANCESCA SATTA (President Substitute)

Teaching methods

Theoretical and applied lectures

LESSONS START

According to the official classes schedule, available at http://www.ingegneria.unige.it/index.php/orario-e-calendario-delle-lezioni

Exam description

Oral examination upon request at the end of classes, normally each Tuesday. Please contact the teacher by email <Andrea.Cattanei@unige.it> at least one week in advance.

Assessment methods

Discussion of the subjects treated in course starting from two questions. The examination aims at evaluating physical understanding and engineering usefulness.

Exam schedule