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Weak wide-band signal detection method based on small-scale periodic state of Duffing oscillator

Chinese Physics B 2018年第3期27卷 205-215页

作者： Jian Hou Xiao-peng Yan Ping Li Xin-hong Hao Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical Engineering Beijing Institute of Technology Beijing 100081 China

The conventional Duffing oscillator weak signal detection method, which is based on a strong reference signal, has inherent deficiencies. To address these issues, the characteristics of the Duffing oscillator＇s phase trajectory in a small- scale periodic state are analyzed by introducing the theory of stopping oscillation system. Based on this approach, a novel Duffing oscillator weak wide-band signal detection method is proposed. In this novel method, the reference signal is discarded, and the to-be-detected signal is directly used as a driving force. By calculating the cosine function of a phase space angle, a single Duffing oscillator can be used for weak wide-band signal detection instead of an array of uncoupled Duffing oscillators. Simulation results indicate that, compared with the conventional Duffing oscillator detection method, this approach performs better in frequency detection intervals, and reduces the signal-to-noise ratio detection threshold, while improving the real-time performance of the system.

关键词： Duffing oscillator weak signal detection stopping oscillation system small-scale periodic state

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Measuring System Of Internal Charges In Electron Irradiated Spacecraft’s Insulating Medium

Measuring System Of Internal Charges In Electron Irradiated ...

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IEEE International Conference on Unmanned Systems (ICUS)

作者： Yue Feng Xusong Tang Yanhui Han Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical Engineering Beijing Institute of Technology Beijing China Beijing Orient Institute of Measurement& Test Beijing China

ISBN: (数字)9781728180250

ISBN: (纸本)9781728180267

The accumulation of internal charge in the insulating medium caused by the high-energy charged particles has been one of the important factors threatening the safety of spacecrafts. As the spacecraft's orbital flight time and flight height increase, the internally charged effect of its insulating medium becomes more and more serious. In this work, we designed an internal charge distribution measuring system for an insulating medium under electron irradiation, based on the acoustic pulse method. The system could measure the internal charge of the dielectric material without contacting between the sample and the excitation unit. Furthermore, the internal charge measurements were performed on three kinds of typical spacecraft insulation medium materials (polyimide (PI), low-density polyethylene (LDPE), and polytetrafluoroethylene (PTFE)) under electron irradiation. The internal charge and internal electric field distribution of the specimens were obtained. This system is more suitable for studying the internal charge accumulation behavior of spacecraft's insulating medium in space environment.

关键词： Radiation effects Polyimides Polyethylene Data processing Charge measurement

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Study on uncertainty reasoning of running reliability testing face to CNC machine

Study on uncertainty reasoning of running reliability testin...

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7th International Symposium on Test Automation and Instrumentation, ISTAI 2018

作者： Wu, Guoxin Zuo, Yunbo Wang, Hongjun Xu, Xiaoli Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science &Technology University Beijing China School of Electromechanical Engineering Beijing Information Science &Technology University Beijing China

It is necessary to test the reliability of the operation of the machine itself for meeting the high-speed, ultra-precision, flexible, and other modern manufacturing and processing needs. In practical applications, the obtained reliability detection information presents a variety of uncertainties such as randomness, imprecision, incompleteness and so on, due to the complexity of the machining environment, the limitations of the sensor itself and the imperfections of the information acquisition technology. The uncertainty reasoning method is proposed to test reliability and accuracy precision. Based on the multi-sensor information characteristic, the rule of the credibility sets is established to achieve the operational reliability analysis. It can realise the uncertainty reasoning for the modal and reliability rules. Examples of analysis show that during the high-end CNC machine tools operational reliability analysis, it has a practical effect to study the uncertainty reasoning method of the modal and reliability propositional rule and the analysis basis can be provided for the precision degradation and fault diagnosis. © 2019 Institution of Engineering and technology. All rights reserved.

关键词： Reliability analysis

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Publisher Correction: An open dataset for intelligent recognition and classification of abnormal condition in longwall mining

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Scientific data 2024年第1期11卷 848页

作者： Wenjuan Yang Xuhui Zhang Bing Ma Yanqun Wang Yujia Wu Jianxing Yan Yongwei Liu Chao Zhang Jicheng Wan Yue Wang Mengyao Huang Yuyang Li Dian Zhao School of Mechanical Engineering Xi'an University of Science and Technology No.58 Mid-Yanta Road Xi'an 710054 China. Shaanxi Key Laboratory of Mine electromechanical equipment intelligent Detection and control No.58 Yanta Road Xi'an 710054 China. School of Mechanical Engineering Xi'an University of Science and Technology No.58 Mid-Yanta Road Xi'an 710054 China. zhangxh@***. Shaanxi Key Laboratory of Mine electromechanical equipment intelligent Detection and control No.58 Yanta Road Xi'an 710054 China. zhangxh@***. MARCO automatic control system development Co. LTD No.20 Fenghui South Road Xi'an 710054 China.

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Neural Dynamic Surface Containment control for Multiple Quadrotors

Neural Dynamic Surface Containment Control for Multiple Quad...

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2019 IEEE International Conference on Unmanned Systems, ICUS 2019

作者： Shao, Xingling Tian, Biao Li, Dongguang Ministry of Education North University of China School of Instrument and Electronics North University of China Key Laboratory of Instrumentation Science Dynamic Measurement Taiyuan030051 China Beijing Institute of Technology Science and Technology on Electromechanical Dynamic Control Laboratory Beijing10081 China

ISBN: (纸本)9781728137926

This paper presents an neural dynamic surface containment control design for multiple quadrotors with uncertainties, such that the followers can be driven into the convex hull constituted by multiple dynamic leaders. To facilitate the control design, the quadrotor dynamics is decomposed into translational and rotational subsystems. For each subsystem, in order to enable smooth and rapid learning of unknown system uncertainties and reduce the computational load in traditional neural network (NN), the estimation errors, instead of tracking errors, are used to regulate NN weights and only one NN learning parameter is required for adaptive neural approximation with the aid of minimal learning parameter (MLP), which is more feasible for real-time implementation. Additionally, dynamic surface control (DSC) technique is introduced to extract the time derivative of virtual control laws, and thus the issue of "explosion of complexity" can be circumvented. Finally, the stability analysis is established. Simulation results illustrate the effectiveness and superiority of the proposed control scheme. © 2019 IEEE.

关键词： Real time control

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Magnetic Spring and Its Application in Fuze

Magnetic Spring and Its Application in Fuze

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Artificial Intelligence and electromechanical Automation (AIEA), International Conference on

作者： Haoyuan Yu Li Sui Xinyuan Bian Qiaoran Zhao School of Mechatronical Engineering Beijing Institute of Technology Beijing China Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China Reactor Engineering Technology Research Department Chinese Academy of Atomic Energy Beijing China

ISBN: (数字)9781728182889

ISBN: (纸本)9781728182896

During the working process of the fuze insurance institution, the metal coil spring as a resistance element may cause failure due to fatigue fracture and stress creep relaxation, thereby affecting the reliability and stability of the fuze safety system. To solve this problem, a kind of variable stiffness spring with negative stiffness characteristic is proposed in this paper, which is composed of two magnets. This spring has the advantages of simple structure and rich stiffness characteristics. It is used in fuze recoil insurance institutions to meet the requirements of fuze security system service handling security and reliable release of insurance at launch, providing new features for improving the performance of fuze insurance institutions Technical approach.

关键词： magnetic spring moving magnet steady state safety moving magnet resistive element insurance Steady state safety springs Device Spring Spring season institutions Fatigue fracture simple structures

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Numerical model of direct internal reforming SOFC: A Comparison between Anode-support and Metal-support 16

Numerical model of direct internal reforming SOFC: A Compari...

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16th International Symposium on Solid Oxide Fuel Cells, SOFC 2019

作者： Wang, Y. Ren, J. Shi, Y. Li, X. National Key Laboratory on Electromechanical Dynamic Control Beijing Institute of Technology Beijing100081 China Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Energy and Power Engineering Tsinghua University Beijing100084 China

ISBN: (纸本)9781607688747

Direct internal reforming (DIR) operation provides many benefits for solid oxide fuel cells (SOFCs) by eliminating the need for an extra reformer. Anode-supported SOFCs (AS-SOFCs) are commonly used for DIR operations. However, the strong endothermic reforming reactions at the cell entrance may result in large thermal stresses and lead to premature failure. In this study, a two-dimensional model was developed to analyze the differences between the AS-SOFC and the new generation metal-supported SOFC (MS-SOFC) in DIR operations. The model considered the coupling effects of the chemical/electrochemical reactions, the mass/charge/heat transport processes and the thermal mechanical stress. The distributions of temperature, species composition, current density and thermal stress were determined and compared for both structures. The failure probability of the cell was estimated by stress distributions. The results showed that the MS-SOFC led to a gentler temperature distribution and a smaller failure probability with slight performance increase compared to the AS-SOFC. © The Electrochemical Society.

关键词： Solid oxide fuel cells (SOFC)

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Theoretical analysis and experimental study of a perforated piezoelectric cantilever

Theoretical analysis and experimental study of a perforated ...

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第二届先进电子材料、计算机与材料工程国际学术会议（AEMCME 2019）

作者： Huaiwei Su Li Sui Ping Song Yousong Lu School of Mechatronical Engineering Beijing Institute of Technology Science and Technology on Electromechanical Dynamic Control Laboratory

Piezoelectric energy harvesters have been studied extensively because they show considerable promise for use in both military and commercial applications. In order to improve the output capability of the piezoelectric energy harvester, the perforated piezoelectric cantilevers were designed in this work. To study how the hole on the cantilever affected the output characteristics, this paper analysed the position and size of the hole separately. The results show that, perforating the cantilever can cause stress concentration of the piezoelectric cantilever, and improve the output capacity.

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Design, Simulation and Fabrication of a Time-Delay Device Based on Micro-Channel

Design, Simulation and Fabrication of a Time-Delay Device Ba...

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第二届先进电子材料、计算机与材料工程国际学术会议（AEMCME 2019）

作者： Qiaoran Zhao Li Sui Ping Song School of Mechatronical Engineering Beijing Institute of Technology Science and Technology on Electromechanical Dynamic Control Laboratory

With the development of micro-machining technology, the application of microchannel is becoming more and more popular. In this paper, we design a set of time-delay device based on micro-channel and micro-fluidics technology. This paper describes the timedelay device's working principle and analyses the micro-channel's flow characteristics by simulation method based on Coventerware. From studies on the micro-channel's cross section, geometry and dimension parameters, the micro-channel's optimal form and dimension can be obtained. Finally, this paper chooses ultra-machining process to fabricate the time-delay device.

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RETRACTED ARTICLE: Optimal design and experimental study of a layer metering sensor for high-speed penetration through multi-layer hard targets

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Soft Computing 2021年第2期28卷 423-423页

作者： Yu, Haoyuan Zou, Qipeng Sui, Li Zhang, Li Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China Northwest Industries Group Co. Ltd Xi’an China

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