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Your search keyword '"Hao, Yongmei"' showing total 164 results
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164 results on '"Hao, Yongmei"'

17. Analysis of pipeline leakage signal based on adaptive weighted frequency band entropy optimized VMD algorithm.

Author

Yao, Qiang, Hao, Yongmei, Wu, Fan, Xing, Zhixiang, and Yang, Jian

Subjects
*SEARCH algorithms, *LEAKAGE, *ALGORITHMS, *CURVE fitting, *SIGNAL-to-noise ratio, *ENTROPY
Abstract

The influence of pressure and environment on urban polyethylene (PE) gas pipeline makes structural deterioration and leaking to the pipeline and pipeline easy. This paper proposes an analysis method for optimizing Variational Mode Decomposition (VMD) algorithm. Firstly, the optimal bandwidth is obtained by using the adaptive weighted frequency band entropy (AFBE), and the optimal quadratic penalty factor is obtained by curve fitting. Then, the AFBE is used as the fitness function, and the optimal decomposition level is obtained by the optimized beetle whisker search algorithm. Experimental results show that the signal-to-noise ratio (SNR) is improved by 12.74% on average. [ABSTRACT FROM AUTHOR]

Published
2024
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35. Influence of Side Duct Position and Venting Position on the Explosion and Combustion Characteristics of Premixed Methane/Air.

Author

Cheng, Junping, Hao, Yongmei, Xing, Zhixiang, Song, Rui, Wu, Fan, and Zhuang, Sunqi

Subjects
COMBUSTION, COMBUSTION efficiency, GAUSSIAN function, EXPLOSIONS, METHANE, FLAME, ION channels
Abstract

In order to explore the influence of the side duct position and venting position on the premixed combustion and explosion characteristics of methane/air, a premixed combustion and explosion experiment of methane/air and a simulation of an explosion of the same size were carried out in a tube with an internal size of 2000 mm × 110 mm × 110 mm. The results showed that the side duct could change the flame structure and accelerate the flame inside the tube. The maximum increase ratio of the flame propagation speed was 106.1%. The side duct had a certain venting effect on the explosion pressure. For different position cases, when the venting film was placed over the bottom section, the maximum overpressure first decreased and then increased. When the venting film was placed over the middle section and the top section, the maximum overpressure first increased and then decreased, and the change trend of the top section was stronger. Turbulence mostly occurred inside the side duct when the venting film of the side duct ruptured. There is no linear relationship between the maximum flame propagation velocity within the tube and the maximum turbulent kinetic energy inside the side duct. The two had a relationship that could be fitted to the Gauss function; the correlation coefficient R2 was 0.836, and the minimum value was at (4767.72, 17.918), suggesting that the side duct had the best venting effect on the flame inside the duct at this maximum turbulent kinetic energy. The analysis results of the influence of the location of the vent on the maximum flame propagation velocity inside the tube are helpful for optimizing the layout design of the underground space, reducing the combustion efficiency, and ensuring the safety of the process. [ABSTRACT FROM AUTHOR]

Published
2024
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36. Empagliflozin combined with short-term intensive insulin therapy improves glycemic variability and 1,5-anhydroglucitol in patients with type 2 diabetes: a randomized clinical trial

Author

Hao, Zhihua, primary, Zhao, Yuliang, additional, Zhu, Qiuxiao, additional, Ge, Yanhong, additional, Liu, Zibo, additional, Chen, Yanxia, additional, Jiao, Lijing, additional, Zhao, Xin, additional, Wang, Xing, additional, Wang, Jing, additional, Zhou, Jing, additional, Hao, Huiyao, additional, Hao, Yongmei, additional, Zhou, Hong, additional, Wang, Mian, additional, and Zhang, Lihui, additional

Published
2023
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50. Urban hazardous chemicals pipeline leakage positioning method based on CELMD-MCKD

Author

Juncheng Jiang, Yang Ke, Du Zhanghao, Hao Yongmei, Xing Zhixiang, Yan Xinming, and Lei Ni

Subjects
010302 applied physics, Petroleum engineering, Mechanical Engineering, General Physics and Astronomy, 01 natural sciences, Pipeline transport, Mechanics of Materials, Hazardous waste, 0103 physical sciences, Environmental science, General Materials Science, Leak detection, 010301 acoustics, Leakage (electronics)
Abstract

Aiming at the difficulty of leak detection of urban hazardous chemical pipelines, this paper proposes a method for locating pipeline leaks based on the complementary ensemble local mean decompositi...

Published
2020

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