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- 저자 : Jingtao Wu (검색결과 5 건)
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Estimation of Electromechanical Modes from Ambient PMU Data in China Southern Power Grid
Shi, Bonian,Wu, Jingtao,Yang, Dong,Liu, Yongjun The Korean Institute of Electrical Engineers 2013 The Journal of International Council on Electrical Vol.3 No.3
Online estimation of electromechanical oscillation modes using ambient PMU data is adopted for monitoring the China Southern Power Grid (CSG). After some preprocessing steps, the ambient PMU data is processed by ARMA (Autoregressive Moving average) method, different identification results are obtained from multiple PMU sites. Then by utilization of a clustering method, oscillation modes representing the system operating conditions are derived. In this paper, we report on the preliminary results in CSG and restriction on the ambient data usage is explained. Application of ambient data analysis for oscillation event study is also proposed to judge the oscillation type by comparing the estimated damping ratio value before and during ringdown period. Some suggestions on further ambient data analysis study are also discussed.
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Static Mechanical Characteristics Analysis of Aircraft Tire Under Extreme Weather Conditions
Kai Lei,Jingtao Wu,Zhanpeng Ren,Wenliang Deng,Cong Wang 한국항공우주학회 2024 International Journal of Aeronautical and Space Sc Vol.25 No.3
Rubber is the main component material of aircraft tires. It will harden or soften to a certain extent due to the extreme temperature environment present in the operating conditions of civil aircraft, which changes the stiffness of the tire and affects the cushioning performance of the landing gear dropping process and the maneuverability during taxiing. This article researches the static mechanical characteristics of the 50 × 20 R22 radial aircraft tire across a wide temperature range. Through uniaxial tensile tests, the stress–strain relationships of three rubber materials, including tread rubber, carcass compound, and bead filler, were studied under temperature conditions of − 61 °C, − 41.3 °C, 25 °C, 49 °C, and 70 °C. On this basis, the constitutive relationships of the three rubber materials were established using the Yeoh model. In the finite element software ABAQUS, a three-dimensional numerical simulation model of the tire was created to analyze the radial stiffness, lateral stiffness, longitudinal stiffness, and torsional stiffness of the aircraft tire, as well as the ground contact imprint. The modeling method's accuracy was verified through experiments. This study provides a reference for the environmental adaptability design of aircraft tires.
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Simulation Research on Ice-Breaking Dynamics of Civil Aircraft Flap Mechanism Based on Measured Data
Binwen Wang,Zhu Cheng,Guoyan Qiang,Jingtao Wu,Zhanpeng Ren 한국항공우주학회 2024 International Journal of Aeronautical and Space Sc Vol.25 No.1
In the alpine environment, the flap movement of civil aircraft is easily affected by frozen ice. At present, there are few experimental data on the adhesion strength of frozen ice that can be used to simulate the ice-breaking load of civil aircraft flaps, and the temperature points do not meet the actual use scenarios. To study the dynamic change law of the flap motion mechanism when breaking ice under the condition of ground icing, this paper conducts icing adhesion strength tests at different icing temperature points that meet the actual use scene, and calculates the icing resistance moment under different working conditions according to the experimental data. The icing resistance moment under the condition is the simulation load input. By changing the icing width of the seam to simulate different icing conditions, the process of ice-breaking motion of the flap moving mechanism is simulated, and the general process method of the ice-breaking motion simulation of the moving parts of the civil aircraft is formed, which calibrates the ice-breaking load values of aircraft moving parts under various icing conditions. The research results show that the combination of measured data and dynamic simulation can obtain the variation law of driving torque in the ice-breaking motion of moving parts under various icing conditions, as well as the critical conditions of aircraft use. In addition, the validity and engineering practicability of the method in the anti-ice movement of the civil machine are verified.
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Ziliang Li,Boyu Qin,Xiaoguang Qi,Jingtao Mao,Dan Wu 대한약학회 2016 Archives of Pharmacal Research Vol.39 No.10
Isoalantolactone possessed various biological activities. However, whether it could treat breast cancer and its underlying mechanism remained largely unknown. This study was designed to evaluate the anticancer effects of isoalantolactoneonbreastcancerandexploredthemolecular mechanism.Twohumanbreastcancercelllines(MDA-MB231 and MCF-7) and one normal breast cellline (MCF-10A) were applied. Our data suggested that isoalantolactone decreased breast cancer cell viability in a dose-dependent manner, but showed almost no toxicity to MCF-10A cells. Theanticancereffectsofisoalantolactonewererelatedtothe overexpression of reactive oxygen species. Isoalantolactone significantly induced breast cancer cell apoptosis byactivating caspase cascade, cleaving poly (ADP-ribose) polymerase. Increase of Bax/Bcl-2 ratio, depolarization of mitochondrial membrane potential, release of cytochrome c from mitochondria to cytoplasm and cell cycle arrest at G2/ M phase were associated to the apoptosis induction. Additionally,isoalantolactoneincreasedtheproteinexpressionof p38 MAPK and JNK. The apoptosis-induction of isoalantolactone could be abrogated by co-treatment with SB203580 (inhibitor of p38 MAPK) or SP600125 (inhibitor of JNK). Furthermore, isoalantolactone induced breast cancer cells apoptosis in a caspase-independent pathway, which was downregulation of SIRT1. Therefore, isoalantolactone may serve as a chemotherapeutic agent for the treatment of human breast cancer.
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