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    Wyświetlanie 1-7 z 7
    Tytuł:
    Full-wave Analysis of Periodic Baffle System in Beamforming Applications
    Autorzy:
    Tasinkevych, Y.
    Danicki, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/177861.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sound field calculation
    linear phased arrays
    BIS expansion
    far-field radiation pattern
    beam-steering
    transducer arrays
    composite transducers
    scattering
    generation
    fields
    Opis:
    Mixed boundary-value problem for periodic baffles in acoustic medium is solved with help of the method developed earlier in electrostatics. The nice feature of the method is that the resulting matrices are relatively easy for computations and that the results satisfy exactly the energy conservation law. Illustrative numerical examples present the wave-beam steering (in the far-field) in a baffle system that may be considered as a model of one-dimensional ultrasonic transducer array.
    Źródło:
    Archives of Acoustics; 2010, 35, 4; 661-675
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania porównawcze samochodowych żarówek reflektorowych
    A comparative test of automotive headlamp bulbs
    Autorzy:
    Targosiński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/160079.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
    Tematy:
    reflektory samochodowe
    żarówki
    wiązka świetlna
    headlamps
    filament lamps
    beam pattern
    Opis:
    Na rynku oferowanych jest wiele odmian samochodowych żarówek reflektorowych. Teoretycznie ich parametry są określone wymaganiami regulaminów homologacyjnych. W ciągu ostatnich lat wzrasta i poszerzana jest oferta żarówek określanych przez producentów jako dające "więcej światła" i oznaczane np. +30% +90% itd. Żarówki te posiadają homologację, jednak konstrukcyjnie nieco różnią się od żarówek typowych. W artykule opisano badania porównawcze tego typu żarówek i żarówek "podstawowych" różnych producentów oraz właściwości wiązki świetlnej reflektorów wytwarzanej przy wykorzystaniu takich żarówek. Badania wykonano za pomocą Analizatora Świateł, a dotyczyły one wybranych parametrów wiązki świetlnej reflektora, które zmieniały się wraz z badaną żarówką.
    Market offer many varieties of car headlight bulbs. Theoretically, the parameters are specified by type approval requirements. In recent years, increased and extended the offer of halogen bulbs defined by the manufacturers as offering "more light" e.g. +30%, +90% etc. These bulbs are type approved, but structurally slightly different from conventional light bulbs. This paper describes comparative tests of this type of bulbs of the various manufacturers and headlight beam characteristics produced using such bulbs. The tests was performer using the headlights analyzer AS, and they concerned the beam performance, which have changed with the tested bulb.
    Źródło:
    Prace Instytutu Elektrotechniki; 2012, 256; 211-222
    0032-6216
    Pojawia się w:
    Prace Instytutu Elektrotechniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Objective tests of headlamps in exploitation conditions from traffic safety point of view
    Obiektywne badania reflektorów samochodowych w warunkach eksploatacji pod kątem bezpieczeństwa ruchu
    Autorzy:
    Targosiński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/243104.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    transport
    oświetlenie pojazdów
    reflektory
    wiązka świetlna
    ocena
    vehicle lighting
    headlamps
    beam pattern
    assessment
    Opis:
    From many years the only exploitation activity regarding headlamps is visual aiming on the base of cut-off line. From one side there are many advanced headlamp designs with excellent performance including gas discharge devices or LED's as light source. In last few years there are many efforts towards to work out laboratory objective quality assessment methods. An example is works of technical committee CIE TC4-45. But in exploitation significant numbers of vehicles are equipped with low quality headlamps installed after repairs. Also many plastic lenses are scratched and tarnished and inside parts of headlamp are dusty. Results of this problems are not noticed during simple periodical technical inspection. In Motor Transport Institute headlight analyzer was worked out. It utilizes CCD camera and computer image analysis and allows test detailed characteristics of beam pattern in garage conditions in objective way. Using these device measurements of many vehicles in exploitation conditions was done. There was find out that significant percentage of headlamps in use does not meet minimum type approval requirements. In paper results of tests are presented and main factors responsible for difference between type approval and exploitation are described.
    Źródło:
    Journal of KONES; 2007, 14, 2; 493-504
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Failure Correction of Flattop and Cosecant Squared Beam Patterns in Linear Antenna Arrays
    Autorzy:
    Patidar, H.
    Mahanti, G. K.
    Muralidharan, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/308727.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    cosecant squared pattern
    failure correction
    firefly algorithm
    flattop beam pattern
    linear array
    side lobe level
    Opis:
    This paper deals with the synthesis of flattop and cosecant squared beam patterns using the firefly algorithm which is based on metaheuristics. This synthesis is followed by the correction of the radiation patterns when unfortunate malfunctioning of the individual elements in the array occurs. The necessary attention is given to the recovery process, with due emphasis on reduction of side lobe level, ripple and the reflection coefficient. Simulation in Matlab shows a successful employment of the firefly algorithm in producing voltage excitations of the good elements necessary for the recovered patterns. The performance of the firefly algorithm in failure correction is validated by duly comparing it with a standard benchmark.
    Źródło:
    Journal of Telecommunications and Information Technology; 2017, 4; 25-30
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron Beam Processing of SensorsRelevant Vacoflux-49 Alloy: Experimental Studies of Thermal Zones and Microstructure
    Autorzy:
    Kumar, Pawan
    Yadav, Anshul
    Kumar, Arvind
    Powiązania:
    https://bibliotekanauki.pl/articles/355379.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electron beam processing
    sensor application
    Vacoflux-49
    solidification ring
    fusion zone
    wavy pattern
    Opis:
    Vacoflux-49 (Fe-49% Co-49% V-2%) is used in torque, sonar and gyroscopic sensors applications due to excellent magnetic properties (high saturation magnetisation, low coercivity and high Curie temperature). In this study, the shape, size and characteristics of different thermal zones and the microstructural evolution during electron beam melting and welding of Vacoflux-49 material are studied. The experimental studies on melting have been carried out with under-focussed, focussed and over focussed electron beam. In the case of the under-focussed and over-focused beam, no evaporated zone is found. In the case of focussed beam, a shallow conical-shaped evaporated zone, a choked funnel-shaped fusion zone, a conical shaped partially melted zone and the heat-affected zone are observed. The solidified melt pool in terms of shape, size and microstructure of different zones are investigated for the focussed beam. The grains in the fusion zone appear wavy having crest and trough. The fusion zone microstructure also shows the formation of solidification rings. From the electron beam welding experiments performed for joining two Vacoflux-49 plates (continuous welding), it is found that the weldment shape is similar to the spot melting and re-solidification experiments. The grain growth in different zones in the welding sample is also examined.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 1147-1156
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Study of the Effect of Furrows on Biosonar Beamforming in Aselliscus Stoliczkanus Bat
    Autorzy:
    He, W.
    Feng, J.
    Gao, L.
    Zhang, Z.
    Lu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/176802.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Aselliscus Stoliczkanus bat
    furrows
    frequency-selective characteristics
    finite element method
    beam pattern
    Opis:
    The Aselliscus Stoliczkanus bat, studied here, has intricately shaped structures surrounding the nostrils. These structures are hypothesised to have influence on animals’ acoustic radiation patterns. Using micro-tomography scanning technique, a 3D digital model of the noseleaf is reconstructed and biosonar beam pattern is analysed using a finite element method based on the 3D noseleaf model. The present research focuses on the conspicuous furrows in noseleaf, and our analysis allows to conclude the followings: a) structural details in noseleaf of Aselliscus Stoliczkanus bat can produce acoustic effects even if it is not adjacent to the nostrils, b) the furrows possess frequency-selective characteristics, c) the furrows have the function to manipulate the direction and width of the outgoing ultrasound wave.
    Źródło:
    Archives of Acoustics; 2017, 42, 3; 395-399
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Beam Pattern Optimization Via Unequal Ascending Clusters
    Autorzy:
    Abdulqader, Ahmed Jameel
    Mohammed, Jafar Ramadhan
    Ali, Yessar E. Mohammad
    Powiązania:
    https://bibliotekanauki.pl/articles/2200966.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    beam pattern
    clustered array
    genetic algorithm
    sidelobes
    Opis:
    In this paper, two different architectures based on completely and sectionally clustered arrays are proposed to improve the array patterns. In the wholly clustered arrays, all elements of the ordinary array are divided into multiple unequal ascending clusters. In the sectionally clustered arrays, two types of architectures are proposed by dividing a part of the array into clusters based on the position of specific elements. In the first architecture of sectionally clustered arrays, only those elements that are located on the sides of the array are grouped into unequal ascending clusters, and other elements located in the center are left as individual and unoptimized items (i.e. uniform excitation). In the second architecture, only some of the elements close the center are grouped into unequal ascending clusters, and the side elements were left individually and without optimization. The research proves that the sectionally clustered architecture has many advantages compared to the completely clustered structure, in terms of the complexity of the solution. Simulation results show that PSLL in the side clustered array can be reduced to more than −28 dB for an array of 40 elements. The PSLL was −17 dB in the case of a centrally clustered array, whereas the complexity percentage in the wholly clustered array method was 12 .5 %, while the same parameter for the partially clustered array method equaled 10%.
    Źródło:
    Journal of Telecommunications and Information Technology; 2023, 1; 1--7
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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