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Tytuł:
Comparative Study of the Penetration Characteristics of Ni-Al and Pure Cu Shaped Charge Liners
Autorzy:
Liu, Yingbin
Zhang, Chaoxia
Hu, Xiaoyan
Yang, Li
Sun, Miao
Zhang, Zeng
Yuan, Lei
Powiązania:
https://bibliotekanauki.pl/articles/27788048.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
shaped charge liners
Ni-Al
penetration experiments
white band
microstructure analysis
Opis:
In order to investigate the correlation between the reactivity of Ni-Al and micro-structural differences in the crater walls, penetration experiments were performed with Ni-Al and pure Cu shaped charge liners (SCLs). The experimental results showed that the average penetration depth of Cu jets is 2.3 times that of Ni-Al jets, but the crater entrance diameter of Ni-Al jets is larger by 26.6%. The microstructure of the recovered targets was characterized using optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, and a Vickers micro-hardness system. The Ni-Al “white” band was thicker than that of Cu because it releases a lot of heat. The micro-hardness test showed that the “white” band had a relatively high hardness, and the “white” band hardness in the tail was more significant than that in the head. However, the micro-structural evolution of the crater walls is related to the reactivity of Ni-Al, but is also related to other factors. Combined with the macro penetration results and the evolution of the micro-structure of the crater walls, the “white” band can absorb impact energy more strongly and weaken the jet breaking ability or armour protection ability.These results can provide more valuable reference for designing shaped charge warheads and protection structures.
Źródło:
Central European Journal of Energetic Materials; 2021, 18, 2; 199--222
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water Crises, Water Disputes and Water Cooperation: New Perspectives for Sino-Indian Relations
Autorzy:
Chunyan, Zhang
Xiangyu, Zeng
Powiązania:
https://bibliotekanauki.pl/articles/2092054.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warszawski. Wydział Nauk Politycznych i Studiów Międzynarodowych
Tematy:
Foreign policy
Water
Water resources development
Use of water resources
Management of water resources
Security
Safety risk identification
Polityka zagraniczna
Woda
Gospodarowanie zasobami wody
Użytkowanie zasobów wodnych
Zarządzanie zasobami wodnymi
Bezpieczeństwo
Identyfikacja zagrożeń bezpieczeństwa
Opis:
Both China and India are suffering from a set of grave water crises involving water scarcity, imbalance in both space and time, low water use efficiency and rampant water pollution. Sino-Indian relations might suffer due to a 'concern' over the so-called 'diversion of the Yarlung Zangbo' and water resource development in Tibet. However, the two neighbours need to cultivate sincere water cooperation covering joint research in hydro-technology and water policy, business-to-business engagement and international cooperation on water issues. This will effectively help address the water challenges of both countries. The paper aims to outline the major water security challenges inside both China and India as well as potential conflict over water between them on the one hand, and to explore possible water cooperation between the two neighbours on the other. The major hypothesis is that domestic water security challenges for both China and India are real and severe, while the so-called water conflict between them is largely a played-up story. In this sense, the paper rejects the zero-sum realist framework and calls for a non-zero-sum liberalist approach for a better understanding of the water dynamics between China and India. (original abstract)
Źródło:
Stosunki Międzynarodowe - International Relations; 2017, 53, 3; 143-161
0209-0961
Pojawia się w:
Stosunki Międzynarodowe - International Relations
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on optimal configuration of fault current limiter based on reliability in large power network
Autorzy:
Zeng, Jianjun
Zhang, Yonggao
Powiązania:
https://bibliotekanauki.pl/articles/949918.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
configuration optimization
fault current limiter
reliability
short circuit current
Opis:
With the availability of UHV engineering technology, the scale of the power network is expanding, and the level of the short-circuit current is getting higher, which brings hidden trouble to the safe and stable operation of the power network. Further this article issued a method that optimized the configuration of a current limiter based on the reliability of the power network. According to the reliability analysis under the influence of a short circuit, the quantitative evaluation of reliability of the power network is realized by the calculation of the short-circuit current. A quantitative model is established among reliability evaluation and the short-circuit current as well as load loss, the candidate installation site of a current limiter can be determined according to reliability quantification results. This method uses the particle swarm optimization algorithm to optimize the distribution of the limiter, aiming at the reliability level and the minimum number of current limiters in the short circuit of a power grid. Finally, taking the actual power grid of a province as an example, the result shows that this method can reduce the search space of the optimal solution, optimize the configuration of the current limiter, and effectively limit the short-circuit current and improve the reliability of the power network.
Źródło:
Archives of Electrical Engineering; 2020, 69, 3; 661-677
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study of the aerodynamics of sail in natural wind
Autorzy:
Zeng, X.
Zhang, H..
Powiązania:
https://bibliotekanauki.pl/articles/259718.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
natural wind
wind sail
aerodynamics
sail assisted ship
Opis:
In order to evaluate the impacts of a motor vessel after installing wind sails, the aerodynamics of the sail should be accurately calculated. However most of the research on sails are based on stable wind instead of natural wind which is changing horizontally and vertically. In this paper wind tunnel tests are carried out based on stable wind field and simulated natural wind field, the results shown that there are 16–44% decrease in natural wind in terms of lifting coefficient and 11–42% decrease for drag coefficient. This would provide a valuable reference to the effectiveness evaluation of the impact of sails for sail assisted ships.
Źródło:
Polish Maritime Research; 2018, S 2; 17-22
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detonation Characteristics of Gaseous Isopropyl Nitrate at High Concentrations
Autorzy:
Zeng, Linghui
Liang, Huimin
Zhang, Qi
Powiązania:
https://bibliotekanauki.pl/articles/27788043.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
isopropyl nitrate
detonation properties
detonation products
fuel-rich
numerical simulation
Opis:
Isopropyl nitrate (IPN) is a component of propellant fuel. High concentrations of IPN can still produce detonation. To date, very limited literature is available regarding high concentrations of IPN detonations. The detonation pressure is related to the equivalence ratio and density of IPN/air mixtures. These two factors have opposing effects on the detonation of an IPN/air mixture. The detonation characteristics of gaseous IPN/air mixtures at high concentrations (300-4000 g/m3) have been studied numerically. The results showed that when the IPN concentration is 300-600 g/m3, density played a dominant role on detonation. The maximum detonation pressure, 2.81 MPa, and the maximum detonation velocity, 1890 m/s, occurred at a concentration of 600 g/m3 (equivalence ratio Φ = 2.15). When the IPN concentration was increased from 300 to 600 g/m3, the peak overpressure and velocity increased by 19.6% and 6.2%, respectively. When the IPN concentration is higher than 600 g/m3, the equivalence ratio is extremely large and the detonation properties were seriously degraded. An analysis of the detonation products illustrated the burn-off rate of high concentrations of IPN and the influence of the detonation product CH3CHO. At a concentration of 600 g/m3, the IPN/air mixture can achieve optimal detonation properties and fuel economy.
Źródło:
Central European Journal of Energetic Materials; 2021, 18, 2; 245--270
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Asymmetrical Bending Pipe with Different Gating Systems on Low-Pressure Metal Mold Casting
Autorzy:
Wang, Ning
Li, Rong
Zhang, ZiQi
Zeng, Qi
Powiązania:
https://bibliotekanauki.pl/articles/27314123.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
pipe of aluminum
asymmetrical bending
metal mould
low-pressure casting
casting simulation
rura aluminiowa
forma asymetryczna
odlewanie niskociśnieniowe
symulacja odlewania
Opis:
To prepare a high-quality asymmetrical bending pipe of aluminum alloy by casting, the parting surfaces of the asymmetrical parts were determined based on the characteristics of the parts. Also, the forming process was designed and calculated. After that, the different types of gating systems were designed and the casting process was calculated by ProCAST, and then the influence of different casting gating systems on asymmetrical bending pipes was analyzed. The simulation results show that in the solidification process, although the filling speed of the single runner was slow, but the filling was stable. The gating system with a single runner-round flange filling system would lead to being more uniform for filling flow field and be sequential solidification of temperature field distribution, and stronger of the feeding ability. During the solidification process, the solid phase ratio of the single runner-round flange casting system is larger, and the shrinkage volume is smaller, which made the quality of castings better. Finally, a metal mold and core were made to cast a perfect asymmetric bending pipe of aluminum alloy product in a die casting machine. So the single runner-round flange filling system is suitable for asymmetrical bending pipe casting.
Źródło:
Archives of Foundry Engineering; 2023, 23, 1; 83--102
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the average maintenance time of CNC machine tools based on type II failure correlation
Określenie średniego czasu konserwacji obrabiarek CNC w oparciu o korelację awarii typu II
Autorzy:
Shen, G.
Zeng, W.
Han, C.
Liu, P.
Zhang, Y.
Powiązania:
https://bibliotekanauki.pl/articles/300892.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
obrabiarki CNC
średni czas konserwacji
korelacja awarii typu II
DEMATE /ISM
funkcja kopuły
CNC machine tools
Average maintenance time
Type II failure correlation
DEMATEL/ISM
copula function
Opis:
An average maintenance time calculation method based on components failure correlation analysis is proposed to revise the traditional system maintenance time. This paper focus on complex system type II fault correlation, using the Decision-making trial and evaluation laboratory / Interpretative structural model method to divide the fault level of components. And the copula connection function is introduced to calculation of failure rate function of failure correlation components. In addition, the system maintenance time model is established by synthesizing the failure rate function of each unit of the system. Moreover, the average maintenance time under the minimum number of failures is determined. This method shows that the minimum average maintenance time of the proposed system is more reasonable than the traditional one and provides the basis for system and component reliability design.
W artykule zaproponowano metodę obliczania średniego czasu konserwacji, opartą na analizie korelacji uszkodzeń elementów składowych systemu. Metoda ta ma na celu rewizję tradycyjnego czasu konserwacji systemu. Głównym tematem pracy jest korelacja awarii typu II występujących w systemach złożonych. Elementy systemu podzielono ze względu na poziom uszkodzenia przy użyciu metody DEMATEL w połączeniu z interpretacyjnym modelowaniem strukturalnym. Funkcję intensywności skorelowanych uszkodzeń elementów systemu obliczono za pomocą funkcji łączącej (kopuły). Dodatkowo, opracowano model czasu konserwacji systemu poprzez syntezę funkcji intensywności uszkodzeń każdej jednostki systemu. Ponadto, określono średni czas konserwacji dla minimalnej liczby uszkodzeń. Metoda ta pokazuje, że minimalny średni czas konserwacji proponowanego systemu jest korzystniejszy niż tradycyjnie przyjęty i stanowi podstawę do projektowania niezawodności systemu i jego składowych.
Źródło:
Eksploatacja i Niezawodność; 2017, 19, 4; 604-614
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving the stability of discretization zeros with the Taylor method using a generalization of the fractional-order hold
Autorzy:
Zeng, C.
Liang, S.
Zhang, Y.
Zhong, J.
Su, Y.
Powiązania:
https://bibliotekanauki.pl/articles/330136.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
stability
discretization zeros
Taylor method
signal reconstruction
sampled data model
stabilność
dyskretyzacja
metoda Taylora
rekonstrukcja sygnału
model danych
Opis:
Remarkable improvements in the stability properties of discrete system zeros may be achieved by using a new design of the fractional-order hold (FROH) circuit. This paper first analyzes asymptotic behaviors of the limiting zeros, as the sampling period T tends to zero, of the sampled-data models on the basis of the normal form representation for continuous-time systems with a new hold proposed. Further, we also give the approximate expression of limiting zeros of the resulting sampled-data system as power series with respect to a sampling period up to the third order term when the relative degree of the continuous-time system is equal to three, and the corresponding stability of the discretization zeros is discussed for fast sampling rates. Of particular interest are the stability conditions of sampling zeros in the case of a new FROH even though the relative degree of a continuous-time system is greater than two, whereas the conventional FROH fails to do so. An insightful interpretation of the obtained sampled-data model can be made in terms of minimal intersample ripple by design, where multirate sampled systems have a poor intersample behavior. Our results provide a more accurate approximation for asymptotic zeros, and certain known results on asymptotic behavior of limiting zeros are shown to be particular cases of the ideas presented here.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2014, 24, 4; 745-757
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of heating rate and solvent on Ni-based catalysts prepared by solution combustion method for syngas methanation
Autorzy:
Zeng, Yan
Ma, Hongfang
Zhang, Haitao
Ying, Weiyong
Fang, Dingye
Powiązania:
https://bibliotekanauki.pl/articles/779390.pdf
Data publikacji:
2014
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
nickel catalysts
syngas methanation
solution combustion method
Opis:
Ni-Al2O3 catalysts prepared by solution combustion method for syngas methanation were enhanced by employing various heating rate and different solvent. The catalytic properties were tested in syngas methanation. The result indicates that both of heating rate and solvent remarkably affect Ni particle size, which is a key factor to the catalytic activity of Ni-Al2O3 catalysts for syngas methanation. Moreover, the relationship between Ni particle size and the production rate of methane per unit mass was correlated. The optimal Ni-Al2O3 catalyst prepared in ethanol at 2°C/min, achieves a maximum production rate of methane at the mean size of 20.8 nm.
Źródło:
Polish Journal of Chemical Technology; 2014, 16, 4; 95-100
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Comprehensive Study of the Electrostatic Discharge Sensitivity and Chargeability of Tris(carbohydrazide)zinc Perchlorate
Autorzy:
Li, Z.
Zeng, D.
Zhou, Z.
Zhou, M.
Zhang, T.
Huang, H.
Zhang, J.
Yang, L.
Powiązania:
https://bibliotekanauki.pl/articles/358298.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
primary explosive
tris(carbohydrazide)zinc perchlorate
electrostatic discharge sensitivity
chargeability
Opis:
Most primary explosives are non-conductors, easily accumulate charge when contacting with and separating from other materials, and are sensitive to electrostatic discharge (ESD). In order to reduce the number of accidents caused by ESD initiation of primary explosives, studies on their electrostatic hazards are necessary. This work presents comprehensive experimental results of electrostatic discharge sensitivity and chargeability of tris(carbohydrazide)zinc perchlorate (ZnCP) under different conditions. The influences of the testing conditions, of devices, particle size, ambient temperature and relative humidity on the electrostatic discharge sensitivity and chargeability have been investigated in detail, and the quantitative regression equations obtained.
Źródło:
Central European Journal of Energetic Materials; 2014, 11, 4; 553-573
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The analysis of surface deformation controlled by key strata groups and separation in strip mining
Autorzy:
Luan, Yuan-Zhong
Li, Zeng-Xin
Weng, Li-Yuan
Zhang, Ming-Xin
Powiązania:
https://bibliotekanauki.pl/articles/1402348.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
key strata groups
separation
breaking distance
surface deformation
probability integration
Opis:
In this paper, the key stratum theory is introduced in view of the small surface deformation value of the mining of thick coal mines in Gucheng Coal Mine. The analysis of geological drilling data in Gucheng Goal Mine determines three key strata groups and one main key stratum for controlling the surface deformation of the stratum above the No. 3 coal according to the stiffness and strength condition of the stratum. The breaking distance of the main key stratum in this Mine is determined to be 302–373.7 m in terms of the elastic foundation beam theory and the surface measured basin data. In addition, a large-scale separation model of the main key stratum of the five strip mining face of this Mine is established, and the quantitative calculation formula of the limit spanning of rock beam is proposed and applied to. Finally, the probability integral method is used to predict the surface deformation problem of multiple working faces, and the partition prediction is performed according to the key stratum breaking distance to obtain prediction values of surface deformation consistent with the fracture of key stratum in the study area.
Źródło:
Mining Science; 2020, 27; 303-322
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of preoxidation on copper flotation from copper-lead mixed concentrate
Autorzy:
Peng, Zeng
Haiyun, Xie
Yanling, Jin
Pei, Zhang
Jialing, Chen
Liu, Dianwen
Powiązania:
https://bibliotekanauki.pl/articles/24085956.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
copper-lead mixed concentrate
peroxidation
separation of copper and lead
response surface methodology
Opis:
Flotation separation of galena and chalcopyrite is always a difficult problem in mineral processing. In this paper, the selective preoxidation of galena and chalcopyrite with sulfuric acid was developed, and then the two minerals were completely separated by flotation. The surface oxidation mechanism of galena and chalcopyrite with sulfuric acid was analyzed by Fourier transform infrared spectroscopy (FT-IR) and Atomic Force Microscopy (AFM), and the results showed that hydrophilic oxide film was formed on the galena surface, while the surface of chalcopyrite is still hydrophobic sulfide film, which led to the separation of the two minerals by flotation. In addition, the Response Surface Methodology (RSM) was used to analyze the influence of main preoxidation parameters on the flotation separation of copper-lead concentrate, and the parameters were further optimized, as follows: sulfuric acid concentration of 5.3 mol/L, oxidation temperature of 101.8 °C and time of 48.3 min. The mixed concentrate containing Cu 11.57% and Pb 16.75% was preoxidized under the above conditions, and the flotation separation verification results showed that Cu concentrate with Cu grade of 18.09% and recovery of 95.41%, and Pb concentrate with Pb grade of 44.96% and recovery of 95.94% was obtained respectively. This paper provides a new method of preoxidation combined flotation to achieve high-efficiency separation of copper-lead mixed concentrate.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 163253
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic expression profile of DNA methyltransferases in rat testis development
Autorzy:
Xu, H.X.
Qin, J.Z.
Zhang, K.Y.
Zeng, W.X.
Powiązania:
https://bibliotekanauki.pl/articles/31635.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
DNA methyltransferases (Dnmts) are unique and perform specific functions during male germ cell development. To further characterize the significance of Dnmts in the events leading to production of spermatozoa, we investigated whether the expression patterns in Dnmt1, Dnmt3a, Dnmt3b and Dnmt3l were apparent in rat testes at different time points during development. The qRT-PCR results showed that expression levels of Dnmt3a and Dnmt3l were abundant before birth and were present at the highest levels in testes tissue at 18.5 days postcoitus (dpc), and gradually decreased from day 0 postpartum (dpp) to 90 dpp. Expression of Dnmt1 and Dnmt3b reached a peak after birth (P <0.01), and then gradually reduced until adulthood. Western blotting and immunolocalization analysis of Dnmt3a and Dnmt3b further confirmed the differential expression and localization of the two proteins during rat testis development. The dynamic expression profile of Dnmts implies specific and potentially nonredundant roles for each of these enzymes in the developing rat testis.
Źródło:
Polish Journal of Veterinary Sciences; 2015, 18, 3
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Collaborative 3D-To-2D Tight-Fitting Garment Pattern Design Process for Scoliotic People
Proces projektowania odzieży dla osób ze skoliozą przy użyciu skanera 3D
Autorzy:
Hong, Y.
Zeng, X.
Bruniaux, P.
Liu, K.
Chen, Y.
Zhang, X.
Powiązania:
https://bibliotekanauki.pl/articles/232785.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
atypical morphology
virtual prototyping
collaborative design
sensory evaluation
design process
nietypowa morfologia
projektowanie wirtualne
ocena sensoryczna
proces projektowania
Opis:
This paper presents a virtual design process for a tight-fitting garment pattern for adapter consumer garments, aimed at consumers with scoliosis. The design process proposed is based on a virtual human model created using a 3D scanner, allowing simulation of the morphological shape of an individual with atypical physical deformations. Customized 2D and 3D virtual garment prototyping tools are used in combination to create products through interactions between the consumer, designer and pattern maker. After following an interactive sequence: Scanning – Design – Display – Evaluation – Adjustment, a final design solution acceptable to both the designer and consumer can be obtained. Through this process, traditional 2D garment design knowledge, especially design rules influenced by the fabric information, is fully utilized to support the design process proposed. Using the knowledge based collaborative design process, design satisfaction can be largely improved.
W artykule przedstawiono wirtualny proces projektowania wzoru odzieży dla osób ze skoliozą. Zaproponowany projekt jest oparty na wirtualnym modelu ciała człowieka stworzonym przy użyciu skanera 3D, umożliwiającego symulację morfologicznego kształtu ciała osoby o nietypowych deformacjach fizycznych. Po wykonaniu sekwencji interaktywnej: skanowanie – projekt – wyświetlacz – ocena – dostosowanie, można uzyskać ostateczne rozwiązanie projektowe akceptowalne zarówno dla projektanta, jak i dla konsumentów. W tym procesie tradycyjna wiedza z zakresu zasad projektowania odzieży 2D jest w pełni wykorzystywana w celu wspierania zaproponowanego procesu projektowania. Korzystając z kombinacji obu systemów 2D i 3D można w znacznym stopniu poprawić jakość otrzymanego projektu. Udane rozwiązania projektowe można zintegrować z bazą wiedzy o projektowaniu mody, aby tworzyć nowe zasady projektowania i rozszerzać profesjonalną wiedzę dotyczącą projektowania.
Źródło:
Fibres & Textiles in Eastern Europe; 2017, 5 (125); 113-118
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study of the nonlinear behaviour of deep-sea mooring polyester fibre ropes
Autorzy:
Zhang, He
Zeng, Ji
Jin, Bowen
Chou, Chiate
Li, Hangyu
Dong, Hailei
Powiązania:
https://bibliotekanauki.pl/articles/34611198.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
polyester fibre ropes
static stiffness
creep coefficient
long-term cyclic loads
dynamic stiffness
Opis:
Mooring ropes are essential components of ships and offshore floating structures and they are subjected to cyclic axial loads. This study investigates the evolution of the full-cycle stiffness of fibre polyester ropes under long-term static and dynamic loading. First, the static stiffness characteristics of the ropes, including the rope elongation properties at different stages, shrinkage rates, and creep coefficients after an idle period, are examined under static loads; an empirical formula for static stiffness is established. Second, the dynamic stiffness characteristics of the ropes are investigated under cyclic loads that are typical of platform production operations. The stabilities of the structure under different tensions are compared; the effects of mean tension, tension amplitude, and load cycle on the dynamic stiffness of the ropes are analysed and an empirical formula is established to predict the dynamic stiffness during the engineering design phase. The results of this study can be helpful for the rational design of deep-sea taut-leg mooring systems because they present the evolution of the full-cycle stiffness characteristics of mooring ropes.
Źródło:
Polish Maritime Research; 2023, 3; 153-162
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 21

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