Current trends of the works on acoustics presented at the XLVI Open Seminar on Acoustics OSA'99

• Autorzy: Panuszka R. , Iwaniec M.
• Języki publikacji: EN

Abstrakty

EN

The XLVI Open Seminar on Acoustics was held in Zakopane from the 14th to the 17th of September 1999. It was organized by Cracow's Section of the Polish Acoustic Society, the Laboratory of Structural Acoustics and Intelligent Materials, the Faculty of Mechanical Engineering and Robotics of the Academy of Mining in Cracow and the Committee on Acoustics of the Polish Academy of Sciences. The number of participants was 175. 118 papers were presented. The honorary president was Prof. Ignacy Malecki. Prof. Zbigniew Engel was chairman of the Scientific Committee and the Organizing Committee was chaired by Prof. Ryszard Panuszka. The Seminar was opened by the plenary lecture of Prof. Ignacy Malecki devoted to the application of acoustic emission in engineering materials. The examples of new applications presented in his lecture concerned the monitoring of the technology of ceramics, the investigation of variations in the structure and microstructure of those materials caused by thermal shocks and the monitoring of the behaviour of constructions under conditions close to those prevailing during their long term exploitation as well as the analysis of mechanical and thermo-mechanical parameters in that plasticity and pseudoplasticity effects have been considered. At the beginning of the proceedings in each section a plenary lecture was given. All in all, seven lectures were delivered. Prof. Antoni Jaroszewski discussed the perception effects of an acoustic injury caused by exposure to music sounds with reference to loudness, height discrimination and the frequency and time resolution. Musicians are particularly subject to those injuries. Significant lasting, selective and high-frequency losses in their hearing were found. They indicate that the hearing protection of this group of people is insufficient. Prof. Eugeniusz Kozaczka focused his lecture on some problems of the non-linear effects connected with the generation and propagation of elastic waves in water, on non-linear properties of a medium as well as on making use of those properties in parametric sources of acoustic waves. Prof. Adam Lipowczan characterized the usefulness of modern GIS and GPS techniques in the solution of problems connected with the dangers of vibroacoustic effects to the environment. Those techniques, linking computer maps with data bases, offer new research methods and applications to the study of the propagation of noise and mechanical vibrations in the environment. Dr. Henryk Łopacz presented the possibility of the simulation of audio monitoring in physical as well as in virtual rooms. The simulation of audio monitoring conditions is realized by a convolution of pulse response for a given transmission way and the test signal. In the algorithms presented, the influence of room dimensions, the locations of transmitting and receiving points and the attenuating properties of the room can be taken into account. Profesor Stefan Weyna discussed the analysis of measurements of the vector effects of an acoustic wave represented as sound intensity in the acoustic field of real sources. The results presented concerned measurements of acoustic phenomena occurring in the near field and in small limited areas. The application of a broad-band three-way system to the identification and classification of sea fish shoals was presented by Professor Manell Zakharia. The main construction problems of this device concern the transducers, the levels of the transmitted and received signals, the directivity and impedance variations in the whole frequency region. For a correct working of the device, the algorithm of identification of the fish species is also essential. It was shown that neuron nets can be applied to this end. The device discussed is characterized by a high linearity and a better estimation of the fish size. The identification of the fish species is based only on the characteristic frequencies of the received echo.

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2000
• Tom: Vol. 25, no. 1
• Strony: 111--123

Twórcy

autor

Panuszka R.

• Technical University of Mining and Metallurgy, Structural Acoustics and Intelligent Materials Group

autor

Iwaniec M.

• Technical University of Mining and Metallurgy, Structural Acoustics and Intelligent Materials Group