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8. Introduction

Author

Ji, Jiadong, Shi, Baojun, Deng, Haishun, Ji, Jiadong, Shi, Baojun, and Deng, Haishun

Published
2024
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15. ANALYSIS OF LOAD-BEARING MESHING CHARACTERISTICS OF CYCLOIDAL PINWHEEL OF RV REDUCER BASED ON FINITE ELEMENT MODELING (MT)

Author

LIANG Qiang, CHENG Cheng, and SHI BaoJun

Subjects
Cycloid needle wheel, ANSYS, Transient dynamics, Meshing characteristics, Contact stress, Mechanical engineering and machinery, TJ1-1570, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

In order to study the influence of load change on the meshing characteristics of cycloid pinwheel of RV reducer, considering the modification of cycloid tooth profile, the three-dimensional model of cycloid pinwheel mechanism was established by UG. The changes of meshing tooth pairs and meshing stress of cycloid pinwheel in a meshing transmission cycle were analyzed by using the transient dynamics module of Ansys, and the simulation was compared with the theoretical contact stress. Results show that the overall trend of contact stress between simulation and theory is consistent, the number of meshing teeth and meshing stress of cycloid pinwheel show a periodic law, and increase with the increase of load. The change trend of contact stress and equivalent stress is opposite to the number of meshing teeth, the more the number of meshing teeth, the smaller the meshing stress. The equivalent stress of the needle tooth in the length direction increases with the increase of load, and the stress has a trend of uniform distribution, but the change is small. The finite element analysis has certain reference significance for the design, analysis and manufacture of RV reducer.

Published
2023
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19. Design and Performance Analysis of a Composite Thermal Protection Structure for a Robot Pan–Tilt.

Author

Shi, Baojun, Tian, Saikun, Li, Tao, Song, Shijia, and Sun, Haoran

Abstract

To improve the adaptability of the robot pan–tilt to the high-temperature environment, a design scheme for a composite thermal protection structure composed of aerogel felt, hollow glass, and skin is proposed. The effects of aerogel felt thickness, glass type, and ambient temperature on the thermal protection performance of the structure are studied, using a fluid–solid–thermal coupling model. Numerical results show that the structure exhibits good protection performance, and that the thermal resistance distribution changes the main path of heat transmission. The optimal thickness of the aerogel felt is approximately 8 mm. Compared to 3 mm, 5 mm, and 10 mm thicknesses, 8 mm reduces the maximum temperature by 15.90%, 8.37%, and 6.22%, and reduces the total entropy by 79.23%, 52.44%, and 12.5%. Lower thermal conductivity of the gas inside the hollow glass results in decreased maximum temperatures and total entropy. Using argon-filled hollow glass at 573.15 K decreases maximum temperature by 33.52% and 8.40%, with a total entropy reduction of 33.46% and 6.04%, compared to the single-layer and air-filled glass. Higher ambient temperatures correlate with increased maximum temperature, total entropy, and average surface-heat-transfer coefficient, indicating that the adaptability of the structure to high-temperature environments is limited. [ABSTRACT FROM AUTHOR]

Published
2024
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23. Effective one-pot multienzyme (OPME) synthesis of monotreme milk oligosaccharides and other sialosides containing 4-O-acetyl sialic acid.

Author

Yu, Hai, Zeng, Jie, Li, Yanhong, Thon, Vireak, Shi, Baojun, and Chen, Xi

Subjects
Milk, Animals, Sialic Acids, Sialyltransferases, N-Acylneuraminate Cytidylyltransferase, Oligosaccharides, Molecular Conformation, Infectious Diseases, Nutrition, Influenza, Medicinal and Biomolecular Chemistry, Organic Chemistry
Abstract

A facile one-pot two-enzyme chemoenzymatic approach has been established for the gram (Neu4,5Ac2α3Lac, 1.33 g) and preparative scale (Neu4,5Ac2α3LNnT) synthesis of monotreme milk oligosaccharides. Other O-acetyl-5-N-acetylneuraminic acid (Neu4,5Ac2)- or 4-O-acetyl-5-N-glycolylneuraminic acid (Neu4Ac5Gc) -containing α2-3-sialosides have also been synthesized in the preparative scale. Used as an effective probe, Neu4,5Ac2α3GalβpNP was found to be a suitable substrate by human influenza A viruses but not bacterial sialidases.

Published
2016

31. Exposure to air pollution is associated with congenital anomalies in the population born by in vitro fertilization

Author

Li, Lipeng, primary, Zhang, Na, additional, Wu, Xiaohua, additional, Feng, Tengfei, additional, Zhao, Zhiming, additional, Pang, Yaxian, additional, Zhang, Yaling, additional, Wang, Ning, additional, Ning, Jie, additional, Zhao, Shibin, additional, Jiang, Tao, additional, Shi, Baojun, additional, Niu, Yujie, additional, Zhang, Rong, additional, and Hao, Guimin, additional

Published
2022
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