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Singularity detection of magnetic memory signal of steel-cord conveyor belt

Telkomnika - Indonesian Journal of Electrical engineering 2013年第9期11卷 4904-4910页

作者： Tiezhu, Qiao Xiaolu, Li Xueying, Zhang Education Ministry Key Lab of Advanced Transducers and Intelligent Control System Taiyuan University of Technology Taiyuan 030024 China College of Information Engineering Taiyuan University of Technology Taiyuan 030024 China

Metal magnetic memory technology was an important method for detecting the steel-cord conveyor belt early fault, characteristics of magnetic memory signal extraction is critical for judging of the conveyor belt failure. Generally using of magnetic memory signal maximum gradient value can quickly judge the stress concentration zone, but the magnetic memory signal is susceptible to effected by environmental and noise;In view of the weak and non-stationary characteristics of magnetic memory signal, this paper has proposed the singularity detection method based on wavelet transform modulus maximum for metal magnetic memory signal, the method could exactly judged the stress concentration zone of joints and located the fault points of the steel-cord belt, the characteristic gradient of magnetic memory signal and the Lipschitz exponent were extracted. The result of simulation indicated the technology was effectively for judging the stress concentration zone and fault point. © 2013 Universitas Ahmad Dahlan.

关键词： Signal detection

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Resonance effect existence or not for landslides triggered by 2008 Wenchuan earthquake:A reply to the comment by *** Chong and Xu Xiwei

Resonance effect existence or not for landslides triggered b...

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中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： Shengwen Qi Qiang Xu Hengxing Lan Bing Zhang Jianyou Liu Key Lab.of Engineering Geomechanics Institute of Geology and GeophysicsChinese Academy of Sciences State Key Lab.of Geo-hard Prevention and Geo-environment Protection Chengdu University of Technology State Key Laboratory of Resources and Environmental System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences Centre for Earth Observation and Digital Earth Chinese Academy of Sciences

We are very grateful to receive these remarks about our *** our paper,we found that more landslides occurred in the block located between F2 and F3 than that in the hanging wall of the seismogenic fault of F2（see Figure 6 in our paper） based on a database of 13,085 landslides in a distributed area of 418.85 km（the smallest landslide in this inventory covers an area of 306.5 m）,and we thought that this is maybe the result of resonance of the block between F2 and F3 under the combination movement of the seismogenic faults F2 and F3 and then the motion there is *** their discussion,Xu and Xu （2012）point out that there is no resonance effect of the block between F2 and F3 combination movement,or the resonance effect is rather

关键词： Coseismic landslide Wenchuan earthquake coseismic fault surface rupture

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Hybrid brain/muscle-actuated control of an intelligent wheelchair

Hybrid brain/muscle-actuated control of an intelligent wheel...

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IEEE International Conference on Robotics and Biomimetics

作者： Zhijun Li Shuangshuang Lei Chun-Yi Su Guanglin Li Key Lab of Autonomous System and Network Control Ministry of Education and College of Automation Science and Engineering South China University of Technology Guangzhou China Department of Mechanical and Industrial Engineering Concordia University Montreal Canada Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen Guangdong China

Brain-computer interface (BCI) controlled wheelchair robots can serve as powerful aids for severely disabled people in their daily life, especially to help them move voluntarily. In order to better understand human “thought”, owing to the development of the hybrid brain/muscle interface technique, in this paper, we present a real-time hybrid brain/muscle interface to control a wheelchair directly to keep the disables recovering several motion capabilities by using noninvasive motor imagery Electroencephalography (EEG) and Electromyography (EMG). The EMG and EEG signals from the users are extracted to control the motion of an intelligent wheelchair. Both signals processing consists of off-line training, online control evaluation, and real-time control. An algorithm called the common spatial patterns (CSP) is used in this human-robot system to extract the most discriminative spatial patterns pairs as features. The extensive experiments were conducted on the developed human-wheelchair systems to verify the proposed approaches.

关键词： Wheelchairs Electroencephalography Electromyography Training Robots Muscles Real-time systems

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A numerical simulation of incremental forming process for polymer sheets

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International Journal of Modelling and Simulation 2012年第4期32卷 265-272页

作者： Sy, Le V. Nam, Nguyen T. PetroVietnam University Hanoi Viet Nam National Key Lab for Digital Control and System Engineering HCM Viet Nam

The incremental sheet forming (ISF) technology has recently received considerable interest due to pre-eminence advantages for low-batch, high-quality, and customized products. Regarding the manufacturing of polymeric materials, this technology could be considered as potential candidate to satisfy growing requirements of low batch and customized products in very short development and production lead-times. In this paper the numerical simulation of ISF process with a cone shape in 45° wall angle, hemispherical-head tools and helical tool-paths is presented. A finite element model, implementing a viscoelasticity material model, is used to examine the deformation of ISF on polymer sheets. The simulated results were utilized to predict variances in thickness of deformed polymer sheet and geometric accuracy. Finally, the comparison between the results from numerical simulations and laboratory experiments carried out on a CNC machine is also presented.

关键词： Viscoelasticity

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Recent development of silicon nanowire FET biosensor for DNA detection

Recent development of silicon nanowire FET biosensor for DNA...

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2012 International Conference on Computing, Measurement, control and Sensor Network, CMCSN 2012

作者： Fan, Xuge Sang, Sengbo Hu, Jie Li, Peiwei Li, Gang Zhang, Wendong MicroNano System Research Center Information Engineering College Taiyuan University of Technology China Key Lab. of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Taiyuan Shanxi China

ISBN: (纸本)9780769547381

Recently biosensors based on silicon nanowire field-effect transistors (SiNW-FETs) have drawn huge amounts of attention, due to their ultrasensitivity, selectivity, label-free and real-time detection abilities. As people know more and more knowledge of the structure and function of nucleic acid molecules, DNA detection has gained importance increasingly. Here, we briefly summarize major fabrication methods in synthesising SiNW-FETs and selectively describe some applications of SiNW-FET biosensors in DNA detection over the past few years. Some key results from each article are summarized, involving the concept and mechanism behind each sensor, with the aim of stimulating more efforts in developing SiNW-FET biosensors for detecting DNA. © 2012 Crown Copyright.

关键词： Biosensors

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Admission control with Elastic QoS for Video on Demand systems

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International Journal of Automation and computing 2012年第5期9卷 467-473页

作者： Fu-Shou Lin 1 Bao-Qun Yin 1,2 Jing Huang 1 Xu-Min Wu 1 1 key lab of Anhui Network Communication system and control, University of Science and Technology of China, Hefei 230027, China 2 National Network New Media engineering Research Center, Institute of Acoustics, Chinese Academy of Science, Beijing 100190, China 1. Key Lab of Anhui Network Communication System and Control University of Science and Technology of China Hefei 230027 China 2. National Network New Media Engineering Research Center Institute of Acoustics Chinese Academy of Science Beijing 100190 China

In network service systems, satisfying quality of service (QoS) is one of the main objectives. Admission control and resource allocation strategy can be used to guarantee the QoS requirement. Based on partially observable Markov decision processes (POMDPs), this paper proposes a novel admission control model for video on demand (VOD) service systems with elastic QoS. Elastic QoS is also considered in resource allocation strategy. Policy gradient algorithm is often available to find the solution of POMDP problems, with a satisfactory convergence rate. Through numerical examples, it can be shown that the proposed admission control strategy has better performance than complete admission control strategy.

关键词： Partially observable Markov decision processes (POMDPs) admission control resource allocation elastic quality of service (QoS) policy gradient

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I-V characteristics of the metal-semiconductor junction

I-V characteristics of the metal-semiconductor junction

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2012 International Conference on Computing, Measurement, control and Sensor Network, CMCSN 2012

作者： Ma, Wenzhe Zhang, Wendong Li, Pengwei Hu, Jie Li, Gang Sang, Shengbo MicroNano System Research Center Information Engineering College Taiyuan University of Technology Taiyuan Shanxi China Key Lab. of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Taiyuan Shanxi China

ISBN: (纸本)9780769547381

The electrical characteristic test of nanowires is important in nano-materials research. The metal-semiconductor junction that is fabricated with semiconductor nanowire and metal probe in electrical test system has impact on the test result directly, therefore it's necessary to study I-V characteristics of the metal-semiconductor(M-S) junction. Si,ZnO,GaN have been selected from multiple semiconductor materials. When they connected with tungsten probe, all of them formed Schottky barriers, but the relationships between current and voltage of the junctions are distinct. In the thesis, I-V curves of these M-S junctions are compared, and the best electrical performance of M-S junction is selected. © 2012 IEEE.

关键词： Nanowires

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The design of burglar alarm circuit based on the magnetic field sensor

The design of burglar alarm circuit based on the magnetic fi...

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2012 International Conference on Computing, Measurement, control and Sensor Network, CMCSN 2012

作者： Deng, Lili Sang, Shengbo Zhang, Wendong Li, Pengwei Hu, Jie Li, Gang Feng, Hui Tang, Xiaoliang MicroNano System Research Center Information Engineering College Taiyuan University of Technology Taiyuan Shanxi China Key Lab. of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Taiyuan Shanxi China

ISBN: (纸本)9780769547381

This paper introduces a design method and a hardware circuit of burglar alarm circuit based on the magnetic field sensor, which can be used to achieve the protection of valuables. The circuit design is ingenious, and has the characteristics of simple structure, light weight, small size, timeliness, high sensitivity and low cost. It has been proved to have a stable and reliable performance by experiment. © 2012 IEEE.

关键词： Timing circuits

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Decentralized control of heterogeneous multi-agents in collective circular motion

Decentralized control of heterogeneous multi-agents in colle...

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31st Chinese control Conference, CCC 2012

作者： Zhiyong, Chen Zhang, Hai-Tao School of Electrical Engineering and Computer Science University of Newcastle Callaghan NSW 2308 Australia Department of Control Science and Engineering State Key Lab of Digital Manufacturing Equipments and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9789881563811

It is an interesting topic to study decentralized control algorithms for a group of agents to achieve a class of collective circular motion, or called torus. An algorithm was proposed in [1] where no global beacon information is required, however, the agents are homogeneous. In particular, it was assumed that the agents have a common nominal rotation radius and share a common reference frame. In this paper, an improved algorithm is proposed on heterogeneous agents by removing the two assumptions. © 2012 Chinese Assoc of Automati.

关键词： Decentralized control

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Post-processing algorithm based on total differential method for multi-axis machine tools with arbitrary configuration

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Jixie Gongcheng Xuebao/Journal of Mechanical engineering 2012年第13期48卷 121-126页

作者： Peng, Fangyu Ma, Jiyang Wang, Li Yan, Rong Li, Bin State Key Lab. of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan 430074 China National Numerical Control System Engineering Research Center Huazhong University of Science and Technology Wuhan 430074 China

Due to existing post-processing algorithm, which is only suitable for a specific type of multi-axis NC machine tool, a generalized method that fits arbitrary configuration is presented. It derives a general kinematic model from multi-body kinematics, and describes the spatial relationship between adjacent CL-data as total differential. The complicated reverse kinematics problem is transformed into solving linear equations. The initial machine control data is solved with the combination of numerical method and total differential method to ensure solving accuracy of subsequent CL-data. In comparison with conventional methods, experiments on a specific machine tool show that the total differential method has attributes of being better generalized, more accurate, and with faster computing speed. © 2012 Journal of Mechanical engineering.

关键词： Machine tools

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