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180 results on '"Yang, Jiangtao"'

2. A Trajectory Planning Method for Optimal Energy Consumption of the Hydraulic Excavator

Author

Zhang Yunyue, Sun Zhiyi, Sun Qianlai, Wang Yin, and Yang Jiangtao

Subjects
Hydraulic excavator, T-type velocity curve, Trajectory planning, Optimal energy consumption, Mechanical engineering and machinery, TJ1-1570
Abstract

In order to reduce the movement energy consumption of the hydraulic excavator and realize the reasonable and effective operation of each joint, a joint interpolation method based on a T-type velocity curve is proposed to realize the optimal energy consumption trajectory planning of the hydraulic excavator. In this method, the speed of each joint is set as uniform acceleration, constant velocity, and uniform deceleration to ensure the stability of the hydraulic excavator in the operation process. Under the constraint conditions of the joint angle, angular velocity, and angular acceleration, the improved adaptive genetic algorithm is used to optimize the uniform acceleration (deceleration) and constant velocity motion time of each joint, obtain the optimal motion curve of each joint, and realize the optimal energy consumption trajectory planning of the hydraulic excavator. The interpolation programming method based on the T-type velocity curve is simulated and compared with the interpolation results of the quartic polynomial under the same conditions. The experimental results show that the trajectory planned by this method has low energy consumption, avoids unnecessary movement of each joint, effectively reduces friction loss, and makes the excavator complete the operation smoothly and with low energy consumption.

Published
2024
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21. Design of a 10 kW Superconducting Homopolar Inductor Machine Based on HTS REBCO Magnet

Author

Ma, Jun, Pan, Yuanhang, Luo, Xuezhi, Xiao, Huaqian, Yang, Jiangtao, Simpson, Nick, and Mellor, Phil

Abstract

The electric aircraft propulsion system requires high speed and high power-weight ratio electrical machines. This paper presents a superconducting homopolar inductor machine (HIM) based on HTS REBCO magnets, which could be a promising candidate for high power density electrical machines for future electric aircraft propulsion system. The HTS-HIM has a simple structure, high rotating speed, and huge potential to achieve a high power-weight ratio (kW/kg). This paper presents our design of a 10 kW HTS-HIM with a rotating speed of 3000 rpm. The structure and crucial parameters of HTS-HIM are presented. A 2D-axial pancake coil model for HTS REBCO magnets was built by using COMSOL. Based on this model, HTS REBCO magnets were design and optimized. The loss of REBCO magnets was also calculated. Finally, the output performance of the 10 kW HTS-HIM was simulated. Our work provides preliminary simulation and analysis for future MW-class HTS-HIM.

Published
2024
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22. Investigation on Performance of Multiple Three-Phase Electrical Machine With Star–Delta Windings

Author

Yu, Jianzong, Yang, Jiangtao, Dai, Shaoren, Wang, Zhenyu, Li, Qing, Huang, Sheng, and Huang, Shoudao

Abstract

The electrical machines with fractional slot windings have been widely investigated. The main challenge of this type of machines is that the magnetomotive force (MMF) harmonics of armature winding is rich, which would lead to torque ripple, eddy current loss, and other adverse effects. In this article, multiple three-phase star–delta windings connection for multiphase electrical machine is proposed, which can efficiently reduce the MMF harmonics of armature winding. First, the general principle of harmonic elimination of multiphase electrical machine with multiple star—delta winding connection is deduced. Then, the influence of multiple star–delta windings of machines with different slot/pole combinations on MMF harmonics of armature winding is investigated. To verify the theoretical analyses, the models of permanent magnetic machine with 24-slot and 36-slot are established, and the multiple star–delta windings is compared with the conventional three-phase, star–delta windings and multiple three-phase windings in terms of torque, torque ripple, loss, vibration, and so on, so as to evaluate the superiority of this connection method. Finally, a prototype with 24-slot/10-pole is manufactured and tested. The test results verify the rationality of the theoretical analyses and simulations.

Published
2024
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32. Design and Evaluation of High-Speed FESS Converter for 1500 VDC Urban Rail Transit System

Author

Tang Yingwei, Liang Yanzhao, Yang Jiangtao, Caiyong Ye, Sifeng Zhao, and Zhang Jian-ping

Subjects
Total harmonic distortion, Energy recovery, Urban rail transit, Computer Networks and Communications, Computer science, medicine.medical_treatment, Aerospace Engineering, Traction (orthopedics), Converters, Automotive engineering, Power rating, Regenerative brake, Duty cycle, Automotive Engineering, medicine, Electrical and Electronic Engineering
Abstract

The urban rail transit system has the characteristics of wide voltage fluctuation, intermittent and strong impact load, limited heat dissipation capacity. The high-speed flywheel energy storage system (FESS) is used to provide network voltage stability and regenerative braking energy recovery due to its high power density, unlimited number of charge-discharge cycles, fast response and environmental friendliness. When considering the design of high-speed FESS converter with 3.6 kHz fundamental frequency and 330 kW rated power used in 1500 VDC urban rail transit system, the two-stage topological converter reduces the efficiency and increase the cost and size, meanwhile, the series-connected converters and the multilevel converter increase the difficulties of control and insulation, so the two-level and I-type three-level converters of high-speed FESS are designed and evaluated. Several comparisons are made by detailed experimental data from the perspective of the traction load characteristics of the 1500 VDC urban rail transit system and the technical and economical requirements of the high-speed FESS. It is found that the three-level converter has significant advantages in matching the traction load characteristics for its higher duty cycle capability, as well as improving the technical and economical performances such as efficiency, du/dt value, THD, voltage stability, and reducing the cost by 40% when compared to the two-level converter. While in the future MW class high-speed FESS development, the maximum output power capacity of the three-level FESS is relatively lower than that of the two-level FESS. The theoretical analyses were verified by experiments.

Published
2021

44. Facile synthesis of N, S co-doped CoMoO4 nanosheets as high-efficiency electrocatalysts for hydrogen evolution reaction.

Author

Wang, Jie, Xuan, Haicheng, Meng, Lingxin, Yang, Jiangtao, Yang, Jiale, Liang, Xiaohong, Li, Yuping, and Han, Peide

Abstract

The development of low-cost and high-efficiency hydrogen evolution reaction (HER) electrocatalysts has become extremely essential to address global energy issues. Herein, we have fabricated arrays of nitrogen and sulfur co-doped CoMoO4 ultrathin nanosheets grown on nickel foam (N, S-CoMoO4/NF400). The experimental results demonstrate that modulating the electronic structure of CoMoO4 by co-doping N and S atoms is one of the most powerful methods to boost the performance of HER. N, S-CoMoO4/NF400 displays superior HER activity under alkaline environment, with overpotentials of 58 and 119 mV at 10 and 100 mA cm−2. The excellent performance of the N, S-CoMoO4/NF400 electrode proves that the N, S co-doping engineering can significantly improve the catalytic activity of transition metal-based oxide HER. [ABSTRACT FROM AUTHOR]

Published
2022
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48. Concise Synthesis of Lacosamide with High Chiral Purity

Author

Meng-Di Chen, Sheng-Hua Gao, An-Jiang Yang, Chunjie Zhao, Yang Jiangtao, Fu-Li Zhang, Feifei Hu, and Zhong Li

Subjects
lcsh:Chemistry, Lacosamide, lcsh:QD1-999, Chemistry, General Chemical Engineering, Antiepileptic drug, medicine, General Chemistry, Combinatorial chemistry, medicine.drug
Abstract

An efficient synthesis process of an antiepileptic drug, lacosamide, with high chiral purity has been developed. A series of acids were screened to form salts with the key intermediate 4, and phosp...

Published
2019

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