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Wyszukujesz frazę "Zhang, Yujie" wg kryterium: Autor


Wyświetlanie 1-7 z 7
Tytuł:
The mining of high risk equipment based on the algorithm of HR-Tree’s decision
Autorzy:
Wang, Shanyuan
Zhang, Yujie
Li, Yao
Gao, Suisui
Yang, Feiling
Powiązania:
https://bibliotekanauki.pl/articles/329680.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
high-risk equipment set
HR-Tree
minus branch
early warning
system elektroenergetyczny
monitorowanie
wczesne ostrzeganie
Opis:
Due to the different construction of various subsystems in the power grid, the information of various systems are not closely connected. Nowadays, the network is complex and changeable where the automation is getting higher. This article takes high-risk equipment set of substation in Liaoyang as the research background. It constructs HR-Tree for the device set, and establishes a high-risk equipment evaluation system which based on the HR-Tree context. Then we calculate high-risk equipment sets in the structure of overall data set. By establishing the original data set and the prior knowledge system of equipment risk, the non-candidate high-risk equipment set is reduced in the local path of the high-risk equipment set. We refer to the process of reducing data as minus branch. After the threshold is established, the branches are reduced and the highest risk equipment set is obtained. Finally, we use the scoring system to find the probability of occurrence of associated devices, such information is more open. Example showed that such methods could effectively express high-risk device sets, and managers could get early warning information based on this. It helps people monitoring the power system, w hich could also provides new ideas for the monitoring project.
Źródło:
Diagnostyka; 2020, 21, 2; 51-59
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The analysis of transformers condition based on Bayes-discriminant method with fault-tree fuzzy evaluation
Autorzy:
Li, Dianyang
Wang, Shanyuan
Zhang, Yujie
Feng, Jian
Wang, Hongzhe
Qin, Ling
Powiązania:
https://bibliotekanauki.pl/articles/328004.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
oil-immersed power transformers
fault tree analysis
fuzzy-evaluation system
Bayes-discriminant
health-operation
transformator mocy
system monitorowania
analiza drzewa błędów
Opis:
China's electric power construction is renewing Increasingly, and the network is complex and changeable where the automation is getting higher. In this paper, Fuzzy evaluation system is established according to fault tree, and the estimation of transformer’s state is judged by analytic hierarchy process. Bayes-discriminant and discriminant formula are used to discriminate transformer’s attributes, which are based on historical data. The machine identification of transformer faults combines the fuzzy evaluation and Bayes-discriminant. It’s accuracy can be improved by correcting parameters. This method can effectively avoid subjective interference caused by artificial weights. The example shows that this method could be applied to judge health status of electric power equipment and this method can play an early-warning role in the operation of monitoring system.
Źródło:
Diagnostyka; 2020, 21, 2; 3-12
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of coil factors on a hydraulic electric inerter based vehicle suspension
Autorzy:
Zhang, Hongdang
Shen, Yujie
Yang, Hongtu
Powiązania:
https://bibliotekanauki.pl/articles/2055039.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
vehicle
suspension
hydraulic electric
inerter
Opis:
This paper concerns the impact of coil factors on a hydraulic electric inerter-based vehicle suspension. A hydraulic electric inerter device is first introduced, and the dynamic model of a quarter car is established. Subsequently, the influences of the coil factors on the body acceleration, suspension working space and dynamic tire load are investigated in both the time and frequency domain. Results show that the coil factors have a slight effect on the vehicle suspension performance, decreasing the root-mean-square (RMS) of the vehicle body acceleration and increasing the RMS of the suspension working space and dynamic tire load.
Źródło:
Journal of Theoretical and Applied Mechanics; 2020, 58, 3; 711--722
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low-Frequency Sound Absorption Potential of Subwavelength Absorbers Based on Coupled Micro-Slit Panels
Autorzy:
Qian, Yujie
Gao, Zhengyuan
Zhang, Jie
Powiązania:
https://bibliotekanauki.pl/articles/31339748.pdf
Data publikacji:
2024
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
coupled MSP
CMSP
cavity-depth optimal scheme COS
panel thickness optimal scheme TOS
low frequency
absorption performance
Opis:
Due to space limitations during installation, reducing low-frequency noise has always been a challenging area. Sub-wavelength structures are typically favored in such scenarios for noise reduction. This paper explores the potential of micro-slit panels (MSP) for low-frequency sound absorption. To further optimize the panel thickness, coupled MSPs (CMSP) with a distance between two MSPs of less than 1 mm are proposed. Firstly, the low-frequency absorption performances of a single MSP based on two optimized schemes – the cavity-depth optimal scheme (COS) and the panel thickness optimal scheme (TOS) – are examined and compared with those of existing ultrathin metamaterials. The results demonstrate that MSP has significant potential for low frequency sound absorption, and COS allows for a smaller overall structural thickness but a larger panel thickness than TOS. Secondly, to reduce the panel thickness, the CMSP is developed and the theoretical model of its acoustic impedance is established and validated by experiments. Then, based on the theoretical model, the low-frequency absorption potential of CMSP is optimized using COS. The results show that both the overall thickness and the panel thickness of the CMSP absorber are reduced while maintaining better performance. Furthermore, the proposed absorber achieves a subwavelength scale since its total thickness can be as small as 0.138λ.
Źródło:
Archives of Acoustics; 2024, 49, 1; 121-128
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Forced motion CFD simulation and load refinement evaluation of floating vertical-axis tidal current turbines
Autorzy:
Zhang, Wanchao
Zhou, Yujie
Wang, Kai
Zhou, Xiaoguo
Powiązania:
https://bibliotekanauki.pl/articles/1573876.pdf
Data publikacji:
2020
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
vertical-axis tidal current turbine
hydrodynamic loads
pitching motion
added mass
damping coefficients
Opis:
Simulation of the hydrodynamic performance of a floating current turbine in a combined wave and flow environment is important. In this paper, ANSYS-CFX software is used to analyse the hydrodynamic performance of a vertical-axis turbine with various influence factors such as tip speed ratio, pitching frequency and amplitude. Time-varying curves for thrust and lateral forces are fitted with the least squares method; the added mass and damping coefficients are refined to analyse the influence of the former factors. The simulation results demonstrate that, compared with nonpitching and rotating turbines under constant inflow, the time-varying load of rotating turbines with pitching exhibits an additional fluctuation. The pitching motion of the turbine has a positive effect on the power output. The fluctuation amplitudes of thrust and lateral force envelope curves have a positive correlation with the frequency and amplitude of the pitching motion and tip speed ratio, which is harmful to the turbine’s structural strength. The mean values of the forces are slightly affected by pitching frequencies and amplitudes, but positively proportional to the tip speed ratio of the turbine. Based upon the least squares method, the thrust and lateral force coefficients can be divided into three components, uniform load coefficient, added mass and damping coefficients, the middle one being significantly smaller than the other two. Damping force plays a more important role in the fluctuation of loads induced by pitching motion. These results can facilitate study of the motion response of floating vertical-axis tidal current turbine systems in waves.
Źródło:
Polish Maritime Research; 2020, 3; 40-49
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluka simulation of PGNAA system for determining heavy metal pollution in the soil sample
Autorzy:
Zhang, Can
Yang, Jianbo
Li, Rui
Qiao, Yujie
Zhang, Xu
Xu, Jie
Powiązania:
https://bibliotekanauki.pl/articles/146960.pdf
Data publikacji:
2020
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
PGNAA
Fluka
heavy metal
prompt gamma-ray yield
metal ciężki
szybka wydajność
promieniowanie gamma
Opis:
This study presented a self-designed prompt gamma neutron activation analysis (PGNAA) model and used Fluka simulation to simulate the heavy metals (Mn, Cu, Hg, Ni, Cr, Pb) in soil samples. The relationship between the prompt gamma-ray yield of each heavy metal and soil thickness, content of heavy metals in the soil, and source distance was obtained. Simulation results show that the prompt gamma-ray yield of each heavy metal increases with the increase in soil thickness and reaches saturation at 18 cm. The greater the proportion of heavy metals in the soil, the greater the prompt gamma-ray yield. The highest content is approximately 3%, and the change in distance between the neutron source and soil sample does not affect the prompt gamma-ray yield of heavy metals.
Źródło:
Nukleonika; 2020, 65, 1; 13-17
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Opportunistic maintenance strategy of a Heave Compensation System for expected performance degradation
Autorzy:
Zhang, Chao
Qian, Yujie
Dui, Hongyan
Wang, Shaoping
Chen, Rentong
Tomovic, Mileta M.
Powiązania:
https://bibliotekanauki.pl/articles/2038156.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
opportunistic maintenance
importance measure
heave compensation
hydraulic system
Monte Carlo
Opis:
In the marine industry, heave compensation systems are applied to marine equipment to compensate for the adverse effects of waves and the hydraulic system is usually used as the power system of heave compensation systems. This article introduces importance theory to the opportunistic maintenance (OM) strategy to provide guidance for the maintenance of heave compensation systems. The working principle of a semi-active heave compensation system and the specific working states of its hydraulic components are also first explained. Opportunistic maintenance is applied to the semi-active heave compensation system. Moreover, the joint integrated importance measure (JIIM) between different components at different moments is analyzed and used as the basis for the selection of components on which to perform PM, with the ultimate goal of delaying the degradation of the expected performance of the system. Finally, compared with conditional marginal reliability importance (CMRI)based OM, the effectiveness of JIIM-based OM is verified by the Monte Carlo method.
Źródło:
Eksploatacja i Niezawodność; 2021, 23, 3; 512-521
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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