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2013 15th IEEE International Conference on Communication Technology

作者： Yanyu Zhang Peng Zeng Guang Yang Jinying Li Key Lab.of Networked Control System Shenyang Institute of AutomationChinese Academy of Sciences School of Computer and Information Engineering Henan University University of Chinese Academy of Sciences

ISBN: (纸本)9781479900763

Motor systems are critical equipment in modern *** make the equipment maintenance more efficient,this paper proposes an online and remote machine condition monitoring and fault diagnosis system for motor system based on WIA-PA(Wireless network for Industry Automation Process Automation).The system continuously monitors the status of the target motor systems using wireless vibration *** extracting the feature of vibration signals,the wireless vibration transmitters send feature data to host computer through WIA-PA wireless sensor *** data are processed further in host computer to make diagnosis for the motor system using the customized expert *** paper describes the structure of the system,vibration transmitter,WIA-PA wireless network and host computer system in *** proposed system was tested in field,and the results are presented.

关键词： Condition-based maintenance Fault diagnosis Industrial wireless sensor network WIA-PA Vibration transmitter

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A geofence algorithm for autonomous flight unmanned aircraft system

A geofence algorithm for autonomous flight unmanned aircraft...

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2019 International Conference on Communications, Information system, and Computer Engineering, CISCE 2019

作者： Fu, Qixi Liang, Xiaolong Zhang, Jiaqiang Qi, Duo Zhang, Xiujun Air Force Engineering University National Key Laboratory of Air Traffic Collision Prevention Xi'an China Shaanxi Province Lab. of Meta-synthesis for Electronic and Information System Xi'an China Air Force Engineering University Air Traffic Control and Navigation College Xi'an China

ISBN: (纸本)9781728136813

In order to improve the safety of UAS flight, an autonomous flight UAS geofence algorithm is proposed. Firstly, by scaling the original geofence, a geofence pre-control-layer generation algorithm is proposed. Then, the buffer is added on the basis of traditional ray method to solve the problem of misjudgement of intersection points. The improved ray casting algorithm is used to detect the violation of geofence, and a re-planning method of the violating waypoints is proposed for the UAS with violating danger. The corresponding control law of boundary maintaining autonomous controls is designed. Simulation results both show that the UAS can modify the original flight path as little as possible on the basis of avoiding the violation of the geofence, and the proposed geofence algorithm is effective and can ensure the flight safety of autonomous UAS in geo-fence. © 2019 IEEE.

关键词： Flight simulators

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A new wireless time synchronization approach for whole-view test system in smart substation

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Dianli Xitong Zidonghua/Automation of Electric Power systems 2013年第9期37卷 103-109页

作者： Jing, Shi Huang, Qi Zhen, Wei Wu, Jie Key Lab. of Wide-Area Measurement and Control on Power System of Sichuan Province University of Electronic Science and Technology of China Chengdu 611731 China Sichuan Electronic Power Research Institute Chengdu 610072 China

The whole-view test method for smart substation is a new test approach in which data transmission and time synchronization are implemented with wireless communication. This paper proposes a new time synchronization method based on wireless local area networks (WLAN) to satisfy the demand of synchronized triggering of data and time lab.ling in the system. The proposed method is implemented by integrating IEEE 1588 precise time protocol and IEEE 802.11 WLAN standard considering the specialty of transmission mechanism and data link in wireless communication, thus current availab.e time synchronization method is improved. Simulation result shows that the precision of wireless time synchronization can be improved up to ±10 μs. © 2013 State Grid Electric Power Research Institute Press.

关键词： IEEE Standards

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A Global Function Model for Digital system Testing

A Global Function Model for Digital System Testing

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1998 3rd International Conference on ASIC

作者： Liu Zejian Lu Hongda Yang Lianxing Chen Qin Dept. of Inf.& Control Eng. Shanghai Jiaotong University ASIC & System State Key Lab. Fudan University

In this paper,the concept of global function of complex digital systems is proposed according to the philosophy of *** a novel approach of test generation is *** approach may be stated summarily as two *** first is to extract global function model by topological analysis and logical analysis of complex digital system,and the next is to find the input vector sequence in order to verify this model This is computer aided test generation using algorithmic graph theory and logic synthesis *** approach is worthy for practical solution of VLSI test generation because it is adaptable to the digital systems described in different levels of abstraction.

关键词： complex digital system memory element comiection graph control unit operational unit logic synthesis

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Characteristics analysis of sugar beet powder fermentated by staphylococcus xylostose 3

Characteristics analysis of sugar beet powder fermentated by...

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2021 3rd International Conference on Polymer Synthesis and Application, ICPSA 2021

作者： Yu, Hao Haibin, Li Siyu, Shi Ting, Li Jiayun, Kang Wenhui, Liang Meixia, Pang Fang, Wang Jinghua, Qi Beijing Key Lab. of Agri. Prod. Detection and Control of Spoilage Organisms and Pesticide Residue Beijing University of Agriculture Beijing China Pengcheng Food Branch of Beijing Shunxin Agricultural Limited Company Beijing China Beijing Innovation Consortium of Swine Research System Beijing China

As a color and antiseptic additive, nitrite has been widely added to meat products. The large amount of nitrite remaining in meat products will generate carcinogenic nitrosamines in the body after eating, so natural sources of nitrate-rich fermented vegetables Powder has certain potential as a substitute for nitrite. In this paper, fermented beet powder rich in nitrite as the research object, spectral characteristics were analyzed. The stability of its pigments under the conditions of temperature, time, pH, metal ions, oxidants and preservatives were studied. The results showed that the maximum absorption wavelength of fermented beet powder measured with an ultraviolet spectrophotometer was 538 nm. The conditions that most affect the content of betacyanins were temperature, pH, and metal ions. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Metal ions

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Single-step model predictive control of VSC converter station supplying power to passive network 4

Single-step model predictive control of VSC converter statio...

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4th International Conference on Advanced Electronic Materials, Computers and Software Engineering, AEMCSE 2021

作者： Shuang, Lv Yu, Yu Wenkang, Yang Lichao, Xu Hubei University of Technology Hubei Key Lab. for High-Efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System China State Grid Hubei Electric Power Co.Ltd. Wuhan Electric Power Supply Company Wuhan430068 China

ISBN: (纸本)9781665415965

The AC power quality of the VSC converter station that supplies power to the passive network is in most cases affected by the PI control parameters. In this paper, the model predictive control algorithm without the need to modulate the PI parameters is applied to the VSC converter station control. Firstly, the discrete mathematical model of VSC inverter in αβ coordinate is derived, and the one-step prediction model of AC control voltage is established. Then, the corresponding cost function is constructed to obtain the next time optimal switching state to act on the inverter with the minimum cost function. Finally, a VSC inverter model that supplies power to the passive network is established in MATlab. and a single-step model predictive control strategy is used to do simulation studies on the conditions of linear load, sudden load change, AC voltage reference value change, and model parameter deviation. The results show that the single-step model predictive control method adopted in this paper improves the power quality and the robustness of the control system. © 2021 IEEE.

关键词： Passive networks

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RNN-based Method for Fault Diagnosis of Grinding system

RNN-based Method for Fault Diagnosis of Grinding System

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IEEE International Conference on Cyber Technology in Automation, control, and Intelligent systems

作者： Qu Xing-yu Zeng Peng Xu Chengcheng Fu Dong-dong University of Chinese Academy of Sciences Beijing China Key Lab of Networked Control System Chinese Academy of Sciences Shenyang China College of Information Science and Engineering Northeastern University Shenyang China

ISBN: (纸本)9781538604915

At present, the fault diagnosis of grinding system is evaluated by human being, which causes low efficiency, low accuracy, high cost and casualties easily. The traditional method has the unsatisfied performance on the classification ability of sample dataset with high dimension and temporal correlation. Aiming at the above problems, a RNN-LSTM based deep learning method is proposed in the paper, which realizes the intelligent fault diagnosis of grinding system. The dataset is batched for inputs of LSTM networks, and the temporal correlation of dataset is extracted, which is used to analyze the fault classification of feature vectors input of before and after time. We conduct the comparison of RNN-LSTM based networks and autoencoder based networks via simulation. It is concluded that the RNN-LSTM based method is obviously superior to the method with autoencoder for the dataset with high dimension and high temporal correlation, and the result of the error rate is less than 3%.

关键词： Fault diagnosis Biological neural networks Training Feature extraction Correlation Machine learning

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Regulation of Magnetism on Fe- and Ni-Doped Sno2 (110) Surfaces by Oxygen Vacancy and Adsorbed O2 Molecule

SSRN

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SSRN 2022年

作者： Shi, Xiaojing Zhang, Yongjia Hao, Weidong Yang, Zhi College of Physics & Optoelectronics Key Lab. of Advanced Transducers & Intelligent Control System Ministry of Education Taiyuan University of Technology Taiyuan030024 China

We investigated the ferromagnetism of Fe- and Ni-doped SnO2 (110) surfaces and the regulation of the doped surface ferromagnetism by the oxygen vacancy and adsorbed O2 molecule. The introduction of Fe/Ni can make the nonmagnetic SnO2 (110) surface have a large magnetic moment and exhibit stable ferromagnetic coupling. The presence of oxygen vacancy weakens the surface magnetic moment and attenuates the surface ferromagnetic coupling. The adsorbed O2 molecule that fills the oxygen vacancy on the doped surface increases the magnetic moment of the defective Fe/Ni-doped SnO2 (110) surface, and has a significant effect on the magnetic coupling of the surface. © 2022, The Authors. All rights reserved.

关键词： Ferromagnetism

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Chaos characteristics analysis of transient signals for phase-locked synthesizer based FHC system

Chaos characteristics analysis of transient signals for phas...

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International Symposium on Communications and Information Technologies (ISCIT)

作者： Li Ping Wang Guohong Xiaopeng Yan Gong Peng Wenbo Shi Song Chunyun Beijing Institute of Technology National Key Lab. of Mechatronic Engineering and Control Beijing China Northeastern University School of Computer and Communication Engineering Qinhuangdao China National Lab. of Information Control Technology for Communication System Jiaxing Zhejiang China

ISBN: (纸本)9781479944156

Frequency synthesizer plays an important role in frequency hopping communication system. In this paper, we derivate the conditions for a system to become the chaotic based on the phase model of phase-locked synthesizer. We found that the system parameter changing during the frequency switching is able to make the system to be chaotic. Based on the Cao's method [5], we find that the fractal dimension of the transient signals should be equal to or less than 4, which also provides the maximal positive Lyapunov exponent. In addition, the unique double-ring attractor of them is also reproduced through the phase reconstruction, which also implies that the frequency switching will result in a chaotic for Frequency-Hopping Communication system.

关键词： Chaotic communication Switches Fractals Estimation Variable speed drives

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AUV dead-reckoning navigation based on neural network using a single accelerometer 11

AUV dead-reckoning navigation based on neural network using ...

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11th ACM International Conference on Underwater Networks and systems, WUWNet 2016

作者： Xie, Yan-Xin Liu, Jun Hu, Cheng-Quan Cui, Jun-Hong Xu, Hongli State Key Laboratory of Robotics CAS No. 114 Nanta Street Shenhe District Shenyang China College of Computer Science and Technology Jilin University Changchun China Underwater Sensor Network Lab. University of Connecticut StorrsCT06269 United States Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai200240 China

ISBN: (纸本)9781450346375

The accuracy of the Autonomous Underwater Vehicles (AUVs) navigation system determines whether they can safely operate and return. Traditional Dead-reckoning (DR) relies on the inertial sensors such as gyroscope and accelerometer. A major challenge for DR navigation is from measurement error of the inertial sensors (gyroscope, accelerometer, etc.), especially when the AUV is near or at the ocean surface. The AUV's motion is affected by ocean waves, and its pitch angle changes rapidly with the waves. This rapid change and the measurement errors will cause great noise to the direction measured by gyroscopes, and then lead to a large error to the DR navigation. To address this problem, a novel DR method based on neural network (DR-N) is proposed to explore the time-varying relationship between acceleration measurement and orientation measurement, which leverages acoustic localization and neural network estimate timely pitch angle through the explored time-varying relationship. This method enables AUV's DR navigation with a single acceleration, without relying on both acceleration and gyroscope. Most importantly, we can improve the accuracy of AUV navigation through avoiding DR errors caused by gyroscope noise at the sea surface. Simulations show DR-N significantly improves navigation accuracy.

关键词： Accelerometers

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