Search

Your search keyword '"Lei, Xusheng"' showing total 113 results
Start Over Author "Lei, Xusheng"
113 results on '"Lei, Xusheng"'

5. The Model Reference Adaptive Control Method for Pesticide Spraying Quadrotor UAVs

Author

Lei, Xusheng, Liao, Shigang, Hao, Yankun, 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, 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, Zhang, Junjie James, Series Editor, Yan, Liang, editor, and Yu, Xiang, editor

Published
2022
Full Text
View/download PDF

13. Loss Minimization Control Based on Bivariate Extreme Value Theory for PMSMs

Author

Liu, Zhuang, Mao, Kun, Lei, Xusheng, Zheng, Shiqiang, and Zhang, Haifeng

Abstract

As considering both copper loss and iron loss, the loss minimization control (LMC) method could help permanent magnet synchronous motors (PMSMs) get higher efficiency compared with the traditional maximum torque per ampere control method. Unfortunately, it suffers from approximate models and the electromagnetic torque, which is hard to get precisely. To overcome these shortcomings and further improve efficiency, this article proposes an improved LMC method based on bivariate extreme value theory for PMSMs. First of all, based on the equivalent model of PMSM considering both copper loss and iron loss, the electrical loss of the PMSM is transformed into a function of the d-q-axis currents. Then, according to the bivariate extreme value theory, the optimal d-q-axis currents without the torque constraint are obtained. On this basis, the optimal d-axis active current model is derived, while the q-axis active current is obtained by the speed controller. After that a current regulator with the feedforward decoupling control of iron loss currents is designed to realize the LMC strategy with implicit torque constraint. At last, implementing comparative experiments with id = 0 control and traditional LMC method, the improved LMC strategy can increase the efficiency of PMSMs significantly, which verifies its effectiveness.

Published
2024
Full Text
View/download PDF

15. In Situ Measurement of High-Frequency Magnetic Field Produced by Electric Heaters in Atomic Sensors

Author

Shao, Qi, Jiang, Liwei, Zhao, Xin, Liu, Jiali, Fang, Chi, Zhu, Jun, Zou, Yuntian, Lei, Xusheng, and Quan, Wei

Abstract

In this study, an in situ measurement method for the high-frequency magnetic field (HFMF) produced by electric heaters in atomic sensors has been proposed for the first time. It is hypothesized and demonstrated that the HFMF generated by electric heaters can be equated to a modulation field that excites atomic spin coherence, from theory and experiment, respectively. Specifically, the spin polarization of atoms in response to the HFMF generated by electric heaters is modeled skillfully using a rotating frame based on the establishment of an optically detected magnetic resonance (ODMR) atomic magnetometer. By combining different equations of spin polarization through systematically varying the parameters of bias and modulation fields, the triaxial amplitudes of the HFMF can be rapidly obtained which are $ (42.26~\pm ~0.12) $ nT, $ (79.28~\pm ~0.04)$ nT, and $ (184.98~\pm ~1.98)$ nT, respectively. The corresponding coefficients of variation are 0.28%, 0.05%, and 1.07%, respectively. The agreement observed between experimental and simulation results provides robust confirmation of the reliability and utility of the method put forth in this study. Our method presented here implements the in situ measurement of HFMF generated by electric heaters, avoiding positional errors arising from non-in situ measurement methods, which has the potential for miniaturized and low-cost atomic sensor applications.

Published
2024
Full Text
View/download PDF

21. The Development of Robot Technology in China

Author

Wang, Tianmiao, Lei, Xusheng, Chou, Wusheng, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Goebel, Randy, editor, Siekmann, Jörg, editor, Wahlster, Wolfgang, editor, Xiong, Caihua, editor, Huang, Yongan, editor, Xiong, Youlun, editor, and Liu, Honghai, editor

Published
2008
Full Text
View/download PDF

23. SVR-Based Oblivious Watermarking Scheme

Author

Fu, Yonggang, Shen, Ruimin, Lu, Hongtao, Lei, Xusheng, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Wang, Jun, editor, Liao, Xiao-Feng, editor, and Yi, Zhang, editor

Published
2005
Full Text
View/download PDF

24. Feedback Control of Humanoid Robot Locomotion

Author

Lei, Xusheng, Su, Jianbo, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Carbonell, Jaime G., editor, Siekmann, Jörg, editor, Wang, Lipo, editor, and Jin, Yaochu, editor

Published
2005
Full Text
View/download PDF

26. Application of RBFNN for Humanoid Robot Real Time Optimal Trajectory Generation in Running

Author

Lei, Xusheng, Su, Jianbo, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Yin, Fu-Liang, editor, Wang, Jun, editor, and Guo, Chengan, editor

Published
2004
Full Text
View/download PDF

30. A High-Performance Compound Control Method for a Three-Axis Inertially Stabilized Platform under Multiple Disturbances

Author

Rui Wang, Fa Fu, and Lei Xusheng

Subjects
Physics and Astronomy (miscellaneous), Chemistry (miscellaneous), General Mathematics, Computer Science (miscellaneous), inertially stabilized platform, nonlinear dynamic model, adaptive extended state observer, back-stepping integral sliding mode control, disturbances
Abstract

Symmetry is presented in the frame structure, modeling, and disturbance analysis of the three-axis inertially stabilized platform (ISP), which affects the control performance of the ISP. To realize high-performance control for the ISP, a nonlinear dynamic model based on the geographic coordinates and a compound control method based on the adaptive extended state observer (ESO) and adaptive back-stepping integral sliding mode control (SMC) are proposed. The nonlinear dynamic model based on geographic coordinates could avoid the degradation of measurement and control performance due to complex coordinate transformations. An adaptive ESO (AESO) has been developed to estimate the unknown disturbances of ISP. With the information from the ISP system, the adaptive bandwidth of AESO can deal with the peaking phenomenon without introducing excessive noise. Furthermore, based on the integral sliding mode, the adaptation laws of parameter uncertainty and disturbance estimation compensation have been developed for the back-stepping integral SMC method, which can reduce the estimation burden and improve the disturbance estimation accuracy of AESO. The asymptotic stability of the compound control method has been proven by the Lyapunov stability theory. Through a series of simulations and experiments, the effectiveness of the compound method is validated.

Published
2022

32. A Compound Control Method Based on the Adaptive Linear Extended State Observer and Global Fast Terminal Sliding Mode Control for Inertially Stabilized Platform

Author

Rui Wang, Fa Fu, and Lei Xusheng

Subjects
inertially stabilized platform, adaptive linear extended state observer, global fast terminal sliding mode control, disturbances, Control and Optimization, Control and Systems Engineering, Mechanical Engineering, Computer Science (miscellaneous), Electrical and Electronic Engineering, Industrial and Manufacturing Engineering
Abstract

To realize high-performance control for the inertially stabilized platform, a compound control method based on the adaptive linear extended state observer and global fast terminal sliding mode control is proposed. For estimating the unknown disturbances of inertially stabilized platform, an adaptive linear extended state observer was developed. With the full use of the information of attitude and angular velocity, the adaptive bandwidth of an adaptive linear extended state observer can deal with the peaking phenomenon without introducing excessive noise. Furthermore, the adaptation law based on the global fast terminal sliding mode control for disturbance estimation compensation was developed, which can improve the disturbance estimation accuracy of the adaptive linear extended state observer, and the higher order terminal function in global fast terminal sliding mode control was replaced by the lumped disturbance estimation of adaptive linear extended state observer, which can improve the anti-interference ability of inertially stabilized platform, reduce the chattering problem, and improve the control performance. The asymptotic stability of the proposed control method has been proven by the Lyapunov stability theory. The effectiveness of the proposed method was validated by a series of simulations and experiments.

Published
2022

44. Research on detection method of UAV obstruction based on binocular vision.

Author

Zhu, Xiongwei, Lei, Xusheng, Sui, Zhehao, Liu, Lin, Yang, Can, and Ke, Jianfeng

Subjects
*DRONE aircraft, *BINOCULAR vision, *IMAGE processing, *AERONAUTICAL flights, *MEASUREMENT of distances
Abstract

For the autonomous obstacle positioning and ranging in the process of UAV (unmanned aerial vehicle) flight, a system based on binocular vision is constructed. A three-stage image preprocessing method is proposed to solve the problem of the noise and brightness difference in the actual captured image. The distance of the nearest obstacle is calculated by using the disparity map that generated by binocular vision. Then the contour of the obstacle is extracted by post-processing of the disparity map, and a color-based adaptive parameter adjustment algorithm is designed to extract contours of obstacle automatically. Finally, the safety distance measurement and obstacle positioning during the UAV flight process are achieved. Based on a series of tests, the error of distance measurement can keep within 2.24% of the measuring range from 5 m to 20 m. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

46. An adaptive system identification method for a micro unmanned helicopter robot

Author

Liang Jianhong, Wu Yongliang, Lei Xusheng, Wang Chaolei, and Wang Tianmiao

Subjects
Engineering, Adaptive control, State-space representation, business.industry, System identification, ComputerApplications_COMPUTERSINOTHERSYSTEMS, Control engineering, Mobile robot, Servomechanism, Remotely operated underwater vehicle, Data modeling, law.invention, law, Robot, business, Simulation
Abstract

Focusing on the dynamic model parameter identification problem, this paper proposed an adaptive linear-time-domain system identification method for the micro unmanned helicopter robot. Based on the flash memory in the Micro Guide Navigation Control (MGNC), system recorded the flight data sequences regarding the input signal for servos and output signals for attitude and velocity information. Through the adaptive genetic algorithm, the system can construct the high precise dynamic state space model for the micro unmanned helicopter robot. Finally, the effectiveness of the identified model is verified by a series of simulation and tests. The micro unmanned helicopter robot can finish hover, turn, and straight flight tasks.

Published
2009

Catalog

Books, media, physical & digital resources
See catalog results