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256. Study on the Design and Load Capacity Calculation Method of Dual-lead Precision Worm Drives

Author

Chen Yonghong, Jin Lianghua, Wang Zhigang, and Yuan Hexiang

Subjects
Dual-lead worm drive, Meshing geometry, Parameter design, Bearing capacity, Mechanical engineering and machinery, TJ1-1570
Abstract

In view of the lack of design theory and load-bearing calculation method of dual-lead precision worm drives, the meshing geometry model of the dual-lead worm drive is established based on the principle of spatial meshing, and the design methods of geometric parameters, adjustment and compensation of this worm drive are proposed. Based on the ISO/TS 14521 and using the relative calculation method, loading capacity calculation models for the transmission efficiency, tooth surface wear, tooth surface pitting and tooth root broken are developed. The dual-lead precision worm drive prototype is designed and manufactured, and the transmission performance test is carried out. Through the theoretical analysis, simulation calculation and prototype performance experiment, the correctness of the design method and the reliability of the load-bearing calculation method are verified, which provides a theoretical basis for the design and analysis of the wide application of dual-lead precision worm drives.

Published
2023
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257. Brassinosteroids Mediate Endogenous Phytohormone Metabolism to Alleviate High Temperature Injury at Panicle Initiation Stage in Rice

Author

Chen Yanhua, Wang Yaliang, Chen Huizhe, Xiang Jing, Zhang Yikai, Wang Zhigang, Zhu Defeng, and Zhang Yuping

Subjects
rice, high temperature, panicle initiation stage, phytohormone metabolism, physiological and biochemical indices, Plant culture, SB1-1110
Abstract

High temperatures cause physiological and biochemical changes and significantly affect young panicle development of rice (Oryza sativa L.). Brassinosteroids play important roles in enhancing crop stress resistance. In this study, we subjected rice cultivars Huanghuazhan (heat-resistant) and IR36 (heat-sensitive) to high temperature (HT, 40 ºC) or normal temperature (NT, 33 ºC) for 7 d at the panicle initiation stage, in conjunction with application of 24-epibrassinolide [EBR, a synthetic brassinolide (BR)] or brassinazole (BRZ, a BR biosynthesis inhibitor) at the beginning of the treatments. HT exacerbated spikelet degeneration and inhibited young panicle growth, which were partially prevented by EBR application, while BRZ application aggravated the reduction in spikelet number. HT decreased the contents of BR, active cytokinins (aCTK), active gibberellins (aGA) and indole-3-acetic acid (IAA), but increased the content of abscisic acid (ABA) in young panicles. The activities of key enzymes involved in sucrose hydrolysis, glycolysis and the tricarboxylic acid cycle in young panicles were decreased with the change of endogenous hormone levels under HT. In addition, the contents of H2O2 and malondialdehyde (MDA) were increased and the activities of antioxidant enzymes were decreased in young panicles. Exogenous application of EBR induced the expression of phytohormone biosynthesis-related genes and down-regulated the expression of phytohormone catabolism-related genes to increase the contents of endogenous BR, aCTK, aGA and ABA, thus promoting the decomposition and utilization of sucrose in young panicles, enhancing the activities of superoxide dismutase, catalase and peroxidase, and reducing the accumulation of H2O2 and MDA in young panicles, whereas application of BRZ had the opposite physiological effects. These results showed that brassinosteroids mediate endogenous phytohormone metabolism to alleviate HT injury at the panicle initiation stage in rice.

Published
2023
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258. Asymmetric voltage equalization control strategy of half-bridge three-level dual active bridge

Author

WANG Zhigang, WANG Housheng, ZHANG Qingjie, WU Jinli, and GE Weimei

Subjects
half-bridge three-level (hbtl), dual active bridge (dab), symmetric control, asymmetric control, midpoint potential balance, voltage equalization, Applications of electric power, TK4001-4102
Abstract

To make sure the half-bridge three-level dual active bridge (HBTL-DAB) circuit works correctly,the problem of capacitor voltage equalization between the upper and lower direct current (DC) buses on the three-level side must be solved. In the traditional symmetrical control mode,the capacitor voltage equalization control under load can be achieved by fine-tuning the duty cycle. However,in the case of no-load,the symmetrical control mode is difficult to realize the balance adjustment of the upper and lower DC bus capacitor voltages from the control strategy. Therefore,in view of the above problem,an asymmetric control method for the HBTL-DAB circuit is proposed. Firstly,the reason why the symmetrical mode cannot be equalized is theoretically analyzed. And then according to the asymmetric method,energy deviation on the upper and lower DC bus capacitor between positive and negative half cycles under no-load conditions is calculated. The capacitor voltage equalization control is achieved by adjusting the energy deviation,and the main factors affecting the effect of voltage balance control are also pointed out. Finally,the asymmetric control method is verified under various working conditions by simulation. The results show that no matter in condition of existing external continuous unbalance factors,or external initial unbalance factors,or internal pulse error factors,voltage balance adjustment is achieved by the asymmetric control method under no-load and loaded conditions.

Published
2022
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276. Particle Swarm Based Reinforcement Learning

Author

Duan, Jianyu, Guo, Yanxiao, Wang, Zhigang, Ke, Liangjun, Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Prates, Raquel Oliveira, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Tan, Ying, editor, and Shi, Yuhui, editor

Published
2022
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277. Spatial Data Publication Under Local Differential Privacy

Author

Zhuang, Jian, Wang, Ning, Wang, Zhigang, Wang, Xiaodong, Qu, Haipeng, Wei, Zhiqiang, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Zhao, Xiang, editor, Yang, Shiyu, editor, Wang, Xin, editor, and Li, Jianxin, editor

Published
2022
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278. Multi-Channel RPL Protocol Based on Cross-Layer Design in High-Density LLN

Author

Lei, Jianjun, Wang, Tianpeng, Zhao, Xunwei, Zhang, Chunling, Bai, Jie, Wang, Zhigang, Wang, Dan, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Wang, Lei, editor, Segal, Michael, editor, Chen, Jenhui, editor, and Qiu, Tie, editor

Published
2022
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279. Research on the '32N' Mode of RAMS Management in Urban Rail Transit Signal System

Author

Ma, Jie, Zhang, Fengqin, Wang, Zhigang, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, and Zhang, Zhenyuan, editor

Published
2022
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280. Rolling Bearing Fault Diagnosis Method Based on SSA-ELM

Author

Qian, Long, Wang, Zhigang, Zhou, Zhiqiang, Li, Dong, Peng, Xinjie, Li, Binbin, Jiao, Bin, Howlett, Robert J., Series Editor, Jain, Lakhmi C., Series Editor, Nakamatsu, Kazumi, editor, Kountchev, Roumen, editor, Patnaik, Srikanta, editor, Abe, Jair M., editor, and Tyugashev, Andrey, editor

Published
2022
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281. Uncertain Programming Model for Multiple Distribution Centers

Author

Lv, Yu’er, Cao, Chuxin, Shen, Kang, Wang, Zhigang, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Jia, Yingmin, editor, Zhang, Weicun, editor, Fu, Yongling, editor, Yu, Zhiyuan, editor, and Zheng, Song, editor

Published
2022
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282. Optimization Model of Emergency Shipping Route Based on Uncertainty Theory

Author

Cao, Chuxin, Lv, Yu’er, Shen, Kang, Wang, Zhigang, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Jia, Yingmin, editor, Zhang, Weicun, editor, Fu, Yongling, editor, Yu, Zhiyuan, editor, and Zheng, Song, editor

Published
2022
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296. Combined Application of Leguminous Green Manure and Straw Determined Grain Yield and Nutrient Use Efficiency in Wheat–Maize–Sunflower Rotations System in Northwest China

Author

Zhao, Na, primary, Bai, Lanfang, additional, Han, Dongxun, additional, Yao, Zhiyuan, additional, Liu, Xiaodong, additional, Hao, Yaru, additional, Chen, Zhipeng, additional, Zhang, Xiaohong, additional, Zhang, Dongrui, additional, Jin, Xiaoling, additional, and Wang, Zhigang, additional

Published
2024
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