Temat: target strength - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Research on the Acoustic Scattering Characteristics of Multi-Sections Conning Tower Geometries in Monostatic Configuration
Autorzy:: Han, Lin-Jiang
Song, Hao
Chen, Chang-Xiong
Peng, Xi-Rui
Peng, Zi-long
Powiązania:: https://bibliotekanauki.pl/articles/2141632.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: conning tower
Kirchhoff approximation
target strength
monostatic configuration
Opis:: The overall acoustic echo of a submarine is greatly dependent on the conning tower. For enhancing the acoustic stealth performance of a submarine, it is necessary to research an innovative design scheme of the conning tower to reduce its target strength (TS). The aim of this work is to reduce the TS of a conning tower by varying its geometry and streamlining. The accuracy in modelling the acoustic scattering of a conning tower using the Kirchhoff approximation (KA) was validated, compared with finite element analysis (FEA). Several angular conning tower geometries were designed to analyze the effect of streamlining and the number of lateral facets on TS using the KA method. In consideration of the actual situation, the acoustic effect of backing medium was analyzed by compared water-filled elastic hulls with rigid hulls. From the observed TS calculation results, it is shown that the non-streamlined four lateral-facet conning tower geometries are optimal for acoustic stealth performance during the range of incidence angles from −10° to 10°, whereas the streamlined versions have better performance at incidence angles beyond this range. Furthermore, elastic hulls and rigid hulls provide similar spatial distribution regularities in monostatic configuration with the rigidity affecting the magnitude of the TS.
Źródło:: Archives of Acoustics; 2022, 47, 3; 307-317
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Modelling of acoustic backscattering by southern Baltic herring
Autorzy:: Idczak, J.
Gorska, N.
Powiązania:: https://bibliotekanauki.pl/articles/331977.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: acoustic biomass estimation
Baltic herring
target strength
modelling approach
X-ray images
Opis:: Assessment of Baltic herring abundance can be carried out using acoustic techniques. Analysis of the relationship between the Baltic herring individual target strength, TS, and the total fish length, L, important for the acoustic assessment, showed the relationship to be dependent on the location of the study area. This finding motivated a detailed analysis of the relationship for the herring occurring in the southern Baltic ICES subdivisions 24, 25, and 26, in which Poland is responsible for the acoustic herring abundance assessment. The paper addresses the numerical analysis of the backscattering properties of the southern Baltic herring. The modelling approach used to study the backscattering was based on the Modal Series-Based Deformed Cylinder Model approximation. Details of the individual herring swimbladders were taken into account. Morphometric data necessary for the analysis was obtained from X-ray images of herring from the Polish coastal zone (ICES subdivision 26).
Źródło:: Hydroacoustics; 2016, 19; 145-152
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Normal Mode Solutions of Target Strengths of Solid-filled Spherical Shells and Discussion of Influence Parameters
Autorzy:: Jia, Bing
Fan, Jun
Li, Gui-Juan
Wang, Bin
Chen, Yun-Fei
Powiązania:: https://bibliotekanauki.pl/articles/31339751.pdf
Data publikacji:: 2024
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: solid-filled spherical shell
room temperature vulcanized silicone rubber
target strength enhancement
Opis:: The normal mode solution for the form function and target strength (TS) of a solid-filled spherical shell is derived. The calculation results of the spherical shell’s acoustic TS are in good agreement with the results of the finite element method (FEM). Based on these normal mode solutions, the influences of parameters such as the material, radius, and thickness of the inner and outer shells on the TS of a solid-filled spherical shell are analyzed. An underwater spherical shell scatterer is designed, which uses room temperature vulcanized (RTV) silicone rubber as a solid filling material and does not contain a suspension structure inside. The scatterer has a good TS enhancement effect.
Źródło:: Archives of Acoustics; 2024, 49, 1; 83-93
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Rodzina betonów - geneza pojęcia, terminologia, kryteria, ogólne zasady kreacji
Family of concretes - origin of the concept, terminology, criteria, general design principles
Autorzy:: Kohutek, Z. B.
Powiązania:: https://bibliotekanauki.pl/articles/161194.pdf
Data publikacji:: 2010
Wydawca:: Polski Związek Inżynierów i Techników Budownictwa
Tematy:: beton
rodzina betonów
określenie
terminologia
ocena zgodności
zasada projektowania
beton referencyjny
wytrzymałość docelowa
concrete
family of concretes
concept
definition
terminology
conformity assessment
designing rules
reference concrete
target mean strength
Opis:: W roku 2003 opublikowano normę europejską dla betonu w języku polskim, nadając jej symbol PN-EN 206-1 i tytuł "Beton - cz. 1: Wymagania, właściwości, produkcja i zgodność". W porównaniu do rozwiązań normalizacyjnych poprzedniej generacji (norma PN-88/B-06250 "Beton zwykły" ) kładzie ona nacisk m.in. na ochronę strukturalną betonu w konstrukcji przed agresją ze strony środowiska, rewolucjonizując w ten sposób podejście do kwestii trwałości materiału.
In 2003 a European standard for concrete was published in Polish under the reference number PN-EN 206-1, with the title "Concrete - part 1: Requirements, properties, production and compliance". Compared with the previous generation of standard requirements (the PN-88/B-06250 standard "Ordinary concrete") it places emphasis on such matters as the structural protection of concrete against environmental factors, thus revolutionizing the approach taken to the question of durability of the material.
Źródło:: Przegląd Budowlany; 2010, R. 81, nr 10, 10; 26-31
0033-2038
Pojawia się w:: Przegląd Budowlany
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Assessment of the strength reduction factor in predicting the flexural strength
Autorzy:: Alacali, S.
Arslan, G.
Powiązania:: https://bibliotekanauki.pl/articles/280506.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: reinforced concrete
beam
flexure strength
reduction factor
target reliability
Opis:: In the design of flexural strength, the strength reduction factor φ decreases from tension- -controlled sections to compression-controlled sections to increase safety with decreasing ductility. This paper presents how to determine the reduction factor for flexural strength of reinforced concrete beams according to ACI code. In the reliability-based design, the reliable prediction of the flexural strength of reinforced concrete members is assured by the use of reduction factors corresponding to different target reliability index β. In this study, for different β and coefficients of variation of the flexural strength parameters, the flexural strength reduction factor has been investigated by using experimental studies available in the literature. In the reliability analysis part of the study, the first-order second moment approach (FOSM) has been used to determine the reduction factor. It has also been assumed that the random variables are statistically independent.
Źródło:: Journal of Theoretical and Applied Mechanics; 2018, 56, 4; 1043-1053
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The investigation of the strength reduction factor in predicting the shear strength
Autorzy:: Arslan, G.
Alacali, S. N.
Sagiroglu, A.
Powiązania:: https://bibliotekanauki.pl/articles/281620.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: reinforced concrete
beam
shear strength
reduction factor
target reliability
Opis:: Design codes propose to restrict the nominal probability of failure within specific target structural reliability levels using a load factor and a strength reduction factor. In the current ACI318 Code, the strength reduction factor varies from 0.65 to 0.90, and the value considered in predicting the shear strength equals to 0.75. In this study, the change in the strength reduction factor in predicting the shear strength according to ACI318 has been investigated for different coefficients of variation of concrete compressive strength by using the first-order second moment approach, and the strength reduction factor is proposed for the target values of failure probability.
Źródło:: Journal of Theoretical and Applied Mechanics; 2015, 53, 2; 371-381
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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