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Wyszukujesz frazę "Anderson, D. D." wg kryterium: Autor


Wyświetlanie 1-2 z 2
Tytuł:
Probabilistic model of fibrillation currents created by superposition of two shocking currents with different frequencies
Autorzy:
Korniluk, W.
Sajewicz, D.
Anderson, E.
Powiązania:
https://bibliotekanauki.pl/articles/141388.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
prąd fibrylacyjny
superpozycja prądów rażeniowych
prąd rażeniowy
częstotliwość
fibrylacja komór serca
napięcie rażeniowe
fibrillation current
superposition of shocking currents
frequency 50 Hz and higher
threat of ventricular fibrillation
highest contact shock voltages
Opis:
The paper presents the probabilistic model of fibrillation currents containing two components with different frequencies. An analysis was conducted of the threat of ventricular fibrillation which occurs in consequence of the electric shock with the highest permissible contact shocking voltage of the network frequency (50 Hz), taking into account the threat caused by the second component of the voltage which has the frequency higher than the network frequency. The sample results of calculations apply to the probability of the ventricular fibrillation in case of a shock caused by the highest permissible contact shocking voltage, for the defined time of shock duration, without and with the participation of an additional voltage component with higher frequency. The formula has been presented for the calculation of the highest permissible contact shock voltages with taking into account the voltage component of the frequency higher than the network frequency. The results of calculations indicate that a considerable reduction of the highest permissible contact shock voltage is necessary in order to compensate for a growth of the ventricular fibrillation threat caused by the presence of an additional component with the frequency other the network frequency. This applies in particular to the long shock duration times and low frequencies (up to 500 Hz) of an additional component of the shocking voltage.
Źródło:
Archives of Electrical Engineering; 2010, 59, 1-2; 67-77
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimized Driver Placement for Array-Driven Flat-Panel Loudspeakers
Autorzy:
Anderson, D. A.
Heilemann, M. C.
Bocko, M. F.
Powiązania:
https://bibliotekanauki.pl/articles/177774.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
loudspeaker
array
crossover network
spatial sampling
Opis:
The recently demonstrated ‘modal crossover network’ method for flat panel loudspeaker tuning employs an array of force drivers to selectively excite one or more panel bending modes from a spectrum of panel bending modes. A regularly spaced grid of drivers is a logical configuration for a two-dimensional driver array, and although this can be effective for exciting multiple panel modes it will not necessarily exhibit strong coupling to all of the modes within a given band of frequencies. In this paper a method is described to find optimal force driver array layouts to enable control of all the panel bending modes within a given frequency band. The optimization is carried out both for dynamic force actuators, treated as point forces, and for piezoelectric patch actuators. The optimized array layouts achieve similar maximum mode coupling efficiencies in comparison with regularly spaced driver arrays; however, in the optimized arrays all of the modes within a specified frequency band may be independently addressed, which is important for achieving a desired loudspeaker frequency response. Experiments on flat panel loudspeakers with optimized force actuator array layouts show that each of the panel modes within a selected frequency band may be addressed independently and that the inter-modal crosstalk is typically −30 dB or less with non-ideal drivers.
Źródło:
Archives of Acoustics; 2017, 42, 1; 93-104
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
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