Control of casing vibration – an effective approach to reduce device noise Seminar

The research presented in this lecture proposes an effective approach to reducing equipment noise – control of device casing. It has been developed in three ways.

The first, is passive control, in which by attaching appropriately optimized point masses and ribs to the casing walls, it is possible to fully shape the frequency response of the structure and thus provide high isolation for noise dominant frequencies.

An extension of this concept is the use of composite materials with variable properties along their cross section. In the semi-active approach, new actuators are proposed which, attached to the walls of the casing, can change their properties under the influence of the applied control and thus increase the acoustic isolation.

In the active approach, exciters or piezoelectric elements are used to control the vibrations of the casing in such a way as to absorb the noise they transmit.

The result of each of these approaches is a significant reduction of acoustic emission, and most importantly, it is global in space.

Speaker External: Prof. Marek Pawelczyk, Silesian University of Technology

Prof. Marek Pawelczyk is a specialist in industrial automation, signal processing, vibroacoustics and mathematical modelling. He is the author or co-author of about 250 scientific publications, 3 monographs in English, 12 national and international patent applications. He supervised 5 and was a contractor in 7 projects of the State Committee for Scientific Research (KBN), the Ministry of Science and Higher Education (MNiSW), the National Centre for Research and Development (NCBiR), the National Centre for Scientific Research (NCN), and the Horizon 2020 as well as supervised 15 industrial projects and was a contractor in 8 projects. Many of his studies have been implemented and others are at an advanced stage of commercialization.

He received his doctoral degree with distinction in 1999, his habilitation degree in 2005, from the Faculty of Automatic Control, Electronics and Computer Science, Silesian University of Technology, and the title of professor of technical sciences in 2014. He is a Corr. Member of the Polish Academy of Sciences (life-long membership, since 2022).

He currently holds the positions of: Vice Rector for Science and Development at the Silesian University of Technology; Head of the Department of Measurements and Control Systems at the Silesian University of Technology; member of the state Committee for Science Policy at the Ministry of Education and Science (he was the President of the Committee in 2021), Poland; President of the International Institute of Acoustics and Vibration operating in ca. 70 countries; President of the Consortium of Silesian Public Universities; President of the Metrology Commission at the Polish Academy of Sciences, branch in Katowice; member of the Presidium of the Committee on Automation and Robotics of the Polish Academy of Sciences; vice-president of the association ProSilesia - Business, University, Region; vice-President of the College of Vice Rectors for Science and Development of Public Universities of Technology; President of the chapter of the Polish Congress Ambassadors Program; managing editor of the International Journal of Acoustics and Vibration. At the Silesian University of Technology he coordinates programmes Excellence Initiative - Research University as well as European University Eureca-Pro. For his achievements he has been awarded by, among others: Minister of Higher Education, Polish Academy of Sciences, Foundation for Polish Science, FIAT, SIEMENS.

Marek Pawelczyk was a British Council Fellow at ISVR in September-December 1997, under the supervision of Professor Stephen Elliott.

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