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A multi-probe surface encoder for mosaic XY grating

A multi-probe surface encoder for mosaic XY grating

引用

10th International Symposium on measurement and Quality control 2010, ISMQC 2010

作者： Hosono, Koji Kimura, Akihide Kim, Woo-Jae Gao, Wei Zeng, Lijiang Nano-Metrology and Control Lab. Department of Nanomechanics Tohoku University Aramaki Aza Aoba 6-6-01 Aoba-ku Sendai Miyagi 980-8579 Japan State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instruments Tsinghua University China

ISBN: (纸本)9781617820199

A surface encoder, which can measure the displacements in the XYZ directions simultaneously with one measurement point, has been proposed. The surface encoder consists of a scale XY grating, which is two-axis grating, and an optical sensor head, where a reference XY grating is set perpendicular to the scale XY grating. The size of the scale XY grating determines the measurement range of the surface encoder along the in-plane direction of the scale XY grating. This paper proposes a utilizing a mosaic scale XY grating, which is composed of multiple scale XY gratings, to enlarge the grating area. But the mosaic scale XY grating lias problems of the gaps which exist between each scale XY grating. This paper also proposes a multi-probe surface encoder to solve these issues. The multi-probe surface encoder has multiple probes to be projected onto the mosaic scale XY grating. The displacements can be obtained by the probe which is not on the gaps. The prototype of the proposed multi-probe surface encoder was developed and a basic experiment was carried out with the mosaic scale grating. The experimental results show that the proposed multi-probe surface encoder is effective for the mosaic scale XY grating.

关键词： Probes

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Forecasting next-day electricity prices with Hidden Markov Models

Forecasting next-day electricity prices with Hidden Markov M...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Jianhua Zhang Jingyue Wang Rui Wang Guolian Hou Beijing Key Laboratory of Industrial Process Measurement & Control New Technology and System North China Electric Power University Beijing China

Next-day electricity prices forecasting is essential to consumers and producers. Due to the stochastic characteristics of the electricity price time series, a novel model of electricity price forecasting is presented based on the Hidden Markov Model (HMM). The factors impacting the electricity price forecasting are discussed. The proposed approach is utilized in an electricity market, the results show the effectiveness.

关键词： Hidden Markov models Economic forecasting Stochastic processes Predictive models technology forecasting Energy consumption Power markets Support vector machines Probability distribution Laboratories

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Generalized predictive control for wind turbine systems

Generalized predictive control for wind turbine systems

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Jianhua Zhang Hua Wang Guolian Hou Jinfang Zhang Beijing Key Laboratory of Industrial Process Measurement & Control New Technology and System North China Electric Power University Beijing China

ISBN: (纸本)9781424450459;9781424450466

It is difficult to deal with the variable speed constant frequency (VSCF) wind turbine systems due to the stochastic characteristics and the pneumatic effects of wind. In this paper, a new pitch controller based on generalized predictive control theory is designed to improve the power-output quality of variable speed constant frequency wind turbines. An application to a 300MW wind turbines is given, and simulation results show that the proposed method is effective in wind speed interference suppression and constant out power.

关键词： Predictive control Wind turbines Mathematical model Wind speed Power system modeling Rotors Shafts Wind power generation Frequency Wind energy generation

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Bidding Strategy Based on Adaptive Particle Swarm Optimization for Electricity Market

Bidding Strategy Based on Adaptive Particle Swarm Optimizati...

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The 8th World Congress on Intelligent control and Automation(第八届智能控制与自动化世界大会 WCICA 2010)

作者： Jianhuan Zhang Yingxin Wang Rui Wang Guolian Hou Beijing Key Laboratory of Industrial Process Measurement & Control New Technology and System North China Electric Power University Beijing China

In an open electricity market, generation companies (GENCO) have to optimally bid to gain more profits with incomplete information of other competing generators. In this structure, market participants must develop their bids in order to maximize their profits. Building optimal bidding strategies for GENCO could need to evaluate some market parameters such as forecasting market-clearing price (MCP), non-convex production cost function and forecasting load. A new framework to build bidding strategies for GENCO in an electricity market is presented in this paper. A normal probability distribution function (PDF) is used to describe the bidding behaviors of other competing generators. Bidding strategy of a generator for each trading period in a day-ahead market is solved by a new adaptive particle swarm optimization APSO). APSO can dynamically follow the frequently changing market demand and supply in each trading interval. A numerical example serves to illustrate the essential features of the approach and the results are compared with the solutions by other PSO algorithms.

关键词： Optimization Particle swarm optimization Generators Power generation Electricity supply industry Companies Markov processes

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Study on methods of constructing three-dimensional model for the femur

Study on methods of constructing three-dimensional model for...

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International Conference on BioMedical Engineering and Informatics (BMEI)

作者： Zhixiang Li Chao Ma Faculty of Engineering Open University of China Beijing China Key Laboratory of Modern Measurement & Control Technology Beijing Information Science and Technology University Beijing China

In the mechanics studies of human body structure, it is almost impossible to conduct mechanical experiments. Then the finite element model to simulate mechanical experiments has become an effective tool. In this article, femur model is put forword as an example to introduce several common methods of constructing three-dimension model. It can provide reference for getting femur biomechanical model quickly and efficiently and lay the foundation for further biomechanical experiments and clinical applications.

关键词： Solid modeling Biological system modeling Computed tomography Bones Software Finite element methods Mathematical model

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Color Image Registration via Quaternion Fourier Transform and Parametric Template Method

Color Image Registration via Quaternion Fourier Transform an...

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The 8th World Congress on Intelligent control and Automation(第八届智能控制与自动化世界大会 WCICA 2010)

作者： Shumin Fei Juntao Pan Wenlin Zou Yudong Ni Key Laboratory of Measurement and Control of CSE Ministry of Education Southeast University Nanjing School of Science Hefei University of Technology Hefei Anhui Province China

In this paper, we present a new approach that combines quaternion Fourier transform and parametric template method for registering color images that allows for scaling, translation, and rotation. We can accurately estimate model geometrical parameters based on the properties of quaternion Fourier transform. Inspired by parametric template method that allows fast estimation of the model parameters by a direct linear calculation, we conceived a parametric template space by a set of magnitude of quaternion Fourier transforms. Experiments with real-world scenes demonstrate that the proposed method can not only obtain high estimation accuracy in the presence of image translation, rotation and scaling, but also is conceptually simple, easy to implement, and computationally efficient because no iterative steps are involved.

关键词： Quaternions Color Estimation Accuracy Fourier transforms Frequency modulation Pixel

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Nonlinear output feedback control design of a hypersonic vehicle via high gain observers

Nonlinear output feedback control design of a hypersonic veh...

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IEEE International Symposium on Intelligent control (ISIC)

作者： Xindong Li Bin Xian Chen Diao Yanping Yu Kaiyan Yang Yu Feng Tianjin Key Laboratory of Process Measurement and Control Tianjin University Tianjin China Chinese State Nuclear Power Technology Corporation LTD Beijing China

In this paper, the output feedback control problem for a genetic hypersonic vehicle is considered under the restriction that only the vehicle's velocity and altitude are measurable. High gain observers (HGO) are utilized to provide estimation signals for unmeasurable derivatives of the vehicle's velocity and altitude. A comprehensive stability analysis of the closed loop system under the output feedback control is carried to prove that the proposed control law yields semiglobal uniformly ultimately bounded tracking while keep all the closed loop signals bounded. Numerical simulation results are presented to validate the proposed control design.

关键词： Vehicles Vehicle dynamics Output feedback control design Aerodynamics Observers Trajectory

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Fault Detection and Isolation Based on Optimal Fault-Tolerant Observers for Linear System

Fault Detection and Isolation Based on Optimal Fault-Toleran...

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International Conference on Electrical and control Engineering (ICECE)

作者： Jianbo Yi Qi Huang Sichuan Provincial Key Laboratory of Power System Wide-Area Measurement and Control Department of automation University of Electronic Science and Technology Chengdu Sichuan China

The problem of diagnosing the actuator faults and sensor faults of linear system with the methods of fault detection and isolation (FDI) technology and optimal fault-tolerant observers is addressed. The measurable outputs used to reconstruct states for the system carry the fault information, which may affect the performance of the system state estimation. In this paper, by comparing the measurable outputs, reliable outputs without fault is selected as the input of the reconstructed system. Then reduced order optimal fault-tolerant observers are used to track the system states. Based on the FDI technology, residual observers are designed to achieve the fault detection for the linear system. Case studies demonstrate the effectiveness of FDI technology and optimal fault-tolerant observers method used in fault detection and isolation.

关键词： Observers Fault tolerance Fault tolerant systems Actuators Fault detection Linear systems Mathematical model

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Study on Nonuniform Sampling Signals Based on Wavelet Transform

Study on Nonuniform Sampling Signals Based on Wavelet Transf...

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2010 International Conference on Computer,Mechatronics,control and Electronic Engineering(2010计算机、机电、控制与电子工程国际会议 CMCE 2010)

作者： Dong Li Xiangping Cai Anmin Wang Key Laboratory of Modern Measurement & Control Technology of Ministry of Education Beijing Informati Research of Electronic Information Science and Technology Tongfang Electronic & Science Co. Ltd Beij

ISBN: (纸本)9781424479573

a nonuniform sampling digital signal processing method based on wavelet transform and its application in the frequency detection studied in this paper. The fundamental principle of nonuniform sampling wavelet transform is explored, and the processing procedure is illustrated from the uniform wavelet to nonuniform wavelet. The experimental results demonstrated that the wavelet transform based nonuniform sampling was effective in signal detecting digital signal processes, and accurate in estimating the frequencies of sinusoidal signals.

关键词： nonuniform sampling spectrum analysis wavelet transformation

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Application of Flexible Fuzzy control in Membrane Structure Inflation System

Application of Flexible Fuzzy Control in Membrane Structure ...

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International Conference on E-Product E-Service and E-Entertainment

作者： Qiushuang Liu Xiaoli Xu School of Mechanical & Vehicular Engineering Beijing Institute of Technology Beijing China Key Laboratory of Modern Measurement & Control Technology (Ministry of Education) Beijing Information Science and Technology University Beijing China

ISBN: (纸本)9781424471591

In order to eliminate steady-state errors and chatter caused by quantization error of the conventional fuzzy controller, based on the self-adjustment of quantified proportionality factors fuzzy controller, this paper establishes the flexible fuzzy controller, and can achieve the online parameters self-adjusting function. This method is used in inflation process of pneumatic membrane structure, which enables the inflation process to produce the smooth change in flexible frequency conversion. The results show that the flexible fuzzy logic controller has fast response speed and small steady-state error, meanwhile the parameters change of the controlled object has some flexible adaptability.

关键词： control systems Fuzzy control Biomembranes Atmospheric modeling Steady-state Process control Frequency control

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