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2 Vibrations in Physical Systems

2 2024

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Experimental tests of selected damping and sound-absorbing materials to determine their suitability for sound attenuation of hydroacoustic measuring tank

Schmidt Aleksander M., Kilian Lech, Marszal Jacek

Vibrations in Physical Systems

2024

Vol. 35, nr 1

art. no. 2024113

The article contains a description and results of the measurements necessary to select the optimal material for damping two hydroacoustic measuring tanks according to simple suitability criteria, i.e. obtaining minimal sound reflections from the water surface, walls and bottom in these pools by covering the surfaces with sound-dispersing materials or acoustic absorbers. One will be larger (15x10x10 m) for measurements in the range of possibly low ultrasound frequencies and the other smaller (4x3x3 m). The frequency characteristics of these materials, but also the price, ease of assembly and cleaning, and ageing, are decisive for their usefulness. Attractive (according to these criteria) patches of ‘synthetic grass’ and plates made of various plastics were selected for the measurements. The obtained results were compared with the measurement results of the long-used curtains made of dissipative brushes for dampening the measuring tank of the Department of Sonar Systems (DSS) and with those presented by a specialized manufacturer of commercial absorption plates.

A tool for designing water tanks for measuring hydroacoustic transducers

Salamon Roman, Marszal Jacek, Kochańska Iwona

Vibrations in Physical Systems

2024

Vol. 35, nr 1

art. no. 2024109

Special water tanks are commonly used to measure the parameters of underwater acoustic systems. They must meet specific requirements, the fulfilment of which ensures very small but acceptable measurement errors. These requirements define the size of the tank and its shape as well as the strong attenuation of reflected waves. At the design stage, it is necessary to determine the impact of the tank structure on the measurement errors and to adapt it to the expected measurement methodology. The article presents a mathematical tool for designing such water tanks using the impulse response method. Contrary to the use of this method in architectural design, the presented method is here used to determine the measurement signals emitted by ultrasonic transmitting transducers and received by receiving transducers. The relationships are given between the parameters of the impulse response and the design parameters of the tank and the measurement system, as well as its transfer functions and sample measurement signals.