Dear All,
You are cordially invited to the seminar of the Department of Acoustics, which will be held:
January 30, 2024 at 11:30 am
in the Auditorium named after Prof. Szczepan Szczeniowski
Faculty of Physics, Adam Mickiewicz University, 87 Umultowska St., Poznań
The paper will be presented by Prof. Stefan Weyna, Ph.D., from the Department of Structural Mechanics at the Faculty of Marine Technology and Transport of the West Pomeranian University of Technology in Szczecin.
The title of the paper:
HOW PARTICLE PHYSICS AND NEW SOUND THEORY
CHANGES THE PARADIGM OF CLASSICAL ACOUSTICS
Abstract:
Based on the results of experimental studies of the vector characteristics of acoustic waves, the author tries to confirm the close relationship of fluid mechanics and quantum mechanics with modern acoustics. He takes as an exponent of modernity the transition from classical pressure acoustics to vector vibroacoustics described by the velocity of the acoustic particle or otherwise; acoustic velocity, which is the energetic image of acoustic wave motion. Conducting experimental research using sound intensity, the author focuses on graphical imaging and animation of the dynamics of acoustic flows occurring in real conditions, in free and confined fields. His research employs his own SI-AOD+AI measurement and analysis techniques, as well as non-invasive PIV/LDA laser anemometry.
Thanks to these techniques, commonly known acoustic events such as reflections, refractions and wave dispersions occurring in a real acoustic field can be visually viewed and analyzed (Acoustical Imaging).
With his research results, the author tries to justify a thesis that is open to discussion, assuming that the new theory of acoustic vortex flows (Vortex Sound Theory) based on vector acoustics is changing the paradigm of classical acoustics.
CONTENT:
Introduction to quantum acoustics
Vector acoustics (Vortex Sound Theory)
Vector genesis of sound
Mechano-acoustic analogs and numerical modeling
Decompositions of vector acoustic fields – SI-AOD method
Real source field imaging (AI, Acoustic Imaging)
Experimental analysis of confined flows (waveguides)
New interpretations of some acoustic phenomena – Justification
Summary and conclusions
About the Author:
Professor Stefan Weyna is a retired employee of the Department of Structural Mechanics at the Faculty of Marine Technology and Transport of the West Pomeranian University of Technology in Szczecin. He continues to conduct experimental research in applied acoustics on issues of vector analysis of perturbed acoustic field distributions.
He is engaged in the study of acoustic flows and spatial analysis of perturbed real field structures using proprietary methods of orthogonal decomposition of sound intensity vector fields (SI-AOD) together with graphical imaging (AI, acoustical imaging) of the results of kinematics and dynamics of acoustic wave motion of deeply nonlinear character (spatial wave interference, vortex and rotation effects and turbulence). For measurements, he uses a miniature 3D-UPS sound intensity probe and laser methods (PIV and LDA techniques) adapted for non-invasive acoustic flow studies.
Often surprising experimental results indicate the need to straighten some of the canons of theoretical acoustics, and even to change the paradigm of classical acoustics – moving from pressure acoustics to particle velocity acoustics.
In his research, the professor treats vector acoustic flows as energy phenomena captured with all associated physical reactions, such as; reflection, refraction and scattering of waves. Post-processing analyses of vector acoustic wave features conducted with the author’s tools, place a strong emphasis on the advantages of imaging and animating acoustic events graphically.
As a form of scientific acceptance of the correctness of Prof. Weyna’s innovative research, he has received invitations from several major European scientific and research centers to present relevant papers (Southampton Institut, Delft University, KTH in Stockholm, Charmels University, Politecnik of Valencia, Athen University, The German Aerospace Center- DLR in Göttingen).
Of Professor Weyna’s many award-winning achievements, one can point to his diploma winning the semifinal pool in the prestigious international competition “International Science and Engineering Visualization Challenge” organized by the prestigious SCIENCE Journal and the American scientific institution The Nationale Science Foudation (the paper “The Seven Sound Flowers” was awarded). He was the author of a series of exhibitions of the results of his own work presented in 2006/07 under the name “SHAPES OF SOUND” in several national universities and in the building of the Ministry of Science and Higher Education. The second series of exhibitions currently underway (from 2022) under the name “SHAPES OF SOUND II” is an illustration of the results of the Professor’s research in recent years.
Professor Weyna is the author of more than 350 scientific publications and four books, and for his book entitled. “Dissipation of Acoustic Energy of Real Sources” (PWN), he was awarded the First Degree Prize of the Minister of the Ministry of Science and Higher Education.
You are invited and greeted,
Andrzej Wicher
