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Sound Radiation by Vibrating Building Partitions in Terms of Acceptable Vibration Values

100%
Szeląg A., Stypuła K., Kamisiński T.
Acta Physica Polonica A
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2014
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vol. 125
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issue 4A
A-122-A-126
EN
The subject of this study is an analysis of the phenomenon of sound radiation generated by vibrating building partitions in terms of acceptable vibration values set out in PN-88/B-02171: Evaluation of the vibration impact on people in buildings. The aim of the research was to determine conditions when vibration limits, determined as those providing the required human comfort according to the standard, do not meet the requirements of PN-87/B-02151/02 describing sound level limits in rooms. In order to carry out research showing the phenomenon, various aspects of sound radiation by vibrating building partitions were analyzed theoretically. It was assumed that the vibration velocity of elements did not exceed the limits specified in the standard. Calculations were carried out, in particular, for variants with variable thickness or surface of vibrating partition as well as various types of the construction material. Furthermore, the minimum vibration duration was determined for which the values of noise exceeded the sound level limits.
2
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Narrow Frequency Range Problem of Sound Reflector Arrays

100%
Szeląg A., Rubacha J., Kamisiński T.
Acta Physica Polonica A
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2013
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vol. 123
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issue 6
1059-1063
EN
Overhead stage canopies composed of many panels suspended under ceiling provide proper acoustic field in concert halls and auditoria. The purpose of using these structures is adequate direction and partial dispersion of sound reflected from them. Frequency range of sound reflected from flat panels closely depends on their shape, size and configuration. It is often too narrow and therefore insufficient for the proper sound of the interior. Mutual dependence of the lower and upper frequency limit of sound transmission requires the search for other ways to improve these structures. The paper proposes some solutions concerning spatial structures which have not been yet defined. An attempt was made to determine the useful frequency band of sound transmitted through such reflective structures.
3
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Analysis of disturbing effect of 3 kV DC supplied traction vehicles equipped with two-level and three-level VSI on railway signalling track circuits

100%
Steczek M., Szeląg A., Chatterjee D.
Bulletin of the Polish Academy of Sciences: Technical Sciences
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2017
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issue 5
4
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Influence of contact gaps on the conditions of vehicles supply and wear and tear of catenary wires in a 3 kV DC traction system

89%
Maciołek T., Lewandowski M., Szeląg A., Steczek M., Maciołek T., Lewandowski M., Szeląg A., Steczek M.
Bulletin of the Polish Academy of Sciences: Technical Sciences
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2020
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issue 4
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