Autor: Wrona, Stanislaw - Katalog OPAC zbiorów

Tytuł:: Sound Transmission Through a Thin Plate with Shaped Frequency Response
Autorzy:: Wrona, Stanislaw
Mazur, Krzysztof
Rzepecki, Jaroslaw
Chraponska, Anna
Pawelczyk, Marek
Powiązania:: https://bibliotekanauki.pl/articles/177996.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: structural control
frequency response shaping
vibrating plate
optimisation
modelling
Opis:: Thin plates, in the form of individual panels or whole device casings, often separate the noise source from its recipients. It would be very desirable if the panels could effectively block the sound transmission preventing noise from further propagation. This is especially challenging to achieve at low frequencies. A promising approach, intensively developed in the recent years, is to employ active control methods by adding sensors and actuators, and running a control algorithm. However, if the noise is narrow-band, an alternative passive solution originally developed by the authors can be applied. It is based on appropriately located passive elements which can be used to alter the frequency response of the vibrating structure thus improving its sound insulation properties. Such an approach is referred to as the frequency response shaping method. The purpose of this paper is to further develop this method and apply it to a device casing panel. The efficiency of the method is evaluated by simulation and real experiments. Appropriate cost functions and mathematical models are formulated and used to optimise the arrangement of passive elements mounted to the plate, enhancing its sound insulation properties at the given frequency range. The results are reported, and advantages and limits of the method are pointed out and discussed.
Źródło:: Archives of Acoustics; 2019, 44, 4; 731-738
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: FXLMS with Multiple Error Switching for Active Noise-Cancelling Casings
Autorzy:: Mazur, Krzysztof
Wrona, Stanislaw
Chraponska, Anna
Rzepecki, Jaroslaw
Pawelczyk, Marek
Powiązania:: https://bibliotekanauki.pl/articles/176371.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: active noise control
adaptive control
active casing
Opis:: Passive noise reduction methods require thick and heavy barriers to be effective for low frequencies and those clasical ones are thus not suitable for reduction of low frequency noise generated by devices. Active noise-cancelling casings, where casing walls vibrations are actively controlled, are an interesting alternative that can provide much higher low-frequency noise reduction. Such systems, compared to classical ANC systems, can provide not only local, but also global noise reduction, which is highly expected for most applications. For effective control of casing vibrations a large number of actuators is required. Additionally, a high number of error sensors, usually microphones that measure noise emission from the device, is also required. All actuators have an effect on all error sensors, and the control system must take into account all paths, from each actuator to each error sensor. The Multiple Error FXLMS has very high computational requirements. To reduce it a Switched-Error FXLMS, where only one error signal is used at the given time, have been proposed. This, however, significantly reduces convergence rate. In this paper an algorithm that uses multiple errors at once, but not all, is proposed. The performance of various algorithm variants is compared using simulations with the models obtained from real active-noise cancelling casing.
Źródło:: Archives of Acoustics; 2019, 44, 4; 775-782
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Influence of Double-Panel Structure Modification on Vibroacoustical Properties of a Rigid Device Casing
Autorzy:: Chrapońska, Anna
Rzepecki, Jarosław
Mazur, Krzysztof
Wrona, Stanisław
Pawełczyk, Marek
Powiązania:: https://bibliotekanauki.pl/articles/176468.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: noise control
vibration control
double-panel structures
active casing
natural frequencies
modeshapes
Opis:: Nowadays, noise generated by devices is a serious issue in industry and in everyday life, because it may cause health damage to humans. In this research, a cubic rigid device casing built of double-panel thin steel walls is employed to reduce noise emitted from an enclosed noise source. Double-panel structure is used because of good sound insulation it provides. There exist three main groups of noise reduction methods, i.e. passive, semi-active and active. In this paper, a semi-active modification of double-panel structure is applied and examined. The bistable actuator (solenoid) mounted between incident and radiating plates changes its state due to applied constant voltage, causing the coupling of plates. Experimentally measured natural frequencies and modeshapes of the structure are compared to the simulation results. The influence of proposed modification on dynamical properties of the structure is analyzed and discussed.
Źródło:: Archives of Acoustics; 2020, 45, 1; 119-127
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Problem podparcia hydraulicznych koparek jednonaczyniowych
Autorzy:: Konopka, Stanisław.
Wrona, Józef.
Powiązania:: Biuletyn Wojskowej Akademii Technicznej 1998, nr 4, s. 69-79
Data publikacji:: 1998
Tematy:: Koparka jednonaczyniowa
Mechanika
Roboty ziemne narzędzia i maszyny
Opis:: Rys.; bibliogr.; Abstr., Rez., streszcz.
Dostawca treści:: Bibliografia CBW

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Skocz do pozycji: 15.

Tytuł:: Granulaty bentonitowe jako uszczelnienia mobilnych zapór przeciwpowodziowych
Bentonite granulates as a seals for mobile flood barriers
Autorzy:: Wrona, Piotr
Panna, Wojciech
Lipiński, Stanisław
Woźniak, Maciej
Powiązania:: https://bibliotekanauki.pl/articles/1402366.pdf
Data publikacji:: 2020
Wydawca:: Państwowa Wyższa Szkoła Zawodowa w Tarnowie
Tematy:: mobilne zapory przeciwpowodziowe
bentonity
uszczelnienia bentonitowe
mobile flood barriers
bentonites
bentonite seals
hybrid flood barriers
Opis:: Bentonity i inne surowce smektytowe są szeroko stosowane w wielu gałęziach przemysłu. Autorzy niniejszej pracy dokonali analizy przydatności bentonitowych granulatów pęczniejących w celu ich użycia jako uszczelnień w mobilnych zaporach przeciwpowodziowych. Do tego celu dokonano analizy porównawczej parametrów pęcznienia i uziarnienia trzech dostępnych na rynku granulatów a następnie wykonano próbę makroskopową pęcznienia na specjalnie do tego celu przygotowanym stanowisku badawczym. Wykonane badania wykazały, że nie tylko udział składnika pęczniejącego – smektytu – znacząco wpływa na doszczelnianie układu, ale determinuje go przede wszystkim rozkład wielkości granul i rodzaj smektytu.
Bentonites and other smectite raw materials are widely used in many industries. The authors of the study analyzed the suitability of swelling granulates for their use as a seals in mobile flood barriers. For this purpose, a comparative analysis of the swelling and granulation parameters of three samples available on the market was performed. This results was compared with a macroscopic swelling test, which was realized on the specially prepared test stand. The carried out research shows that not only the content of the swelling minerals – mainly smectite – affect on the sealing of the system, but also they are determine by granules size distribution and the type of smectite.
Źródło:: Science, Technology and Innovation; 2020, 11, 4; 16-23
2544-9125
Pojawia się w:: Science, Technology and Innovation
Dostawca treści:: Biblioteka Nauki

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