检索结果-内蒙古大学图书馆

第37届中国控制会议

作者： Hongxu Zhang Jun Hu Lei Zou Department of Applied Mathematics Harbin University of Science and Technology School of Measurement and Communication Harbin University of Science and Technology The Higher Educational Key Laboratory for Measuring & Control Technology and Instrumentations of Heilongjiang Province Harbin University of Science and Technology School of Engineering University of South Wales College of Electrical Engineering and Automation Shandong University of Science and Technology

In this paper, we address the event-triggered state estimation problem for a class of time-varying complex networks subject to multiplicative noises and stochastic coupling under uncertain occurrence probability. The stochastic coupling is modeled by introducing a set of Bernoulli distributed random variables, where the uncertainties of the occurrence probability is characterized. Moreover, the event-triggered mechanism is employed with hope to reduce the network burden and save energy consumption. The aim of the paper is to design the robust state estimator for addressed dynamics networks and derive an optimized upper bound of the estimation error covariance by properly choosing the estimator gain. Finally, simulations and comparisons are provided to verify the validity of the proposed robust state estimation method.

关键词： Stochastic coupling networks State estimation Event-triggered mechanism Multiplicative noises Uncertain occurrence probability

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Research on fractal method for soft fault diagnosis of nonlinear analog circuits

Modelling, Measurement and Control A

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Modelling, Measurement and control A 2017年第1期90卷 58-73页

作者： Lu, Xinmiao Zhao, Hong Wu, Qiong Higher Educational Key Laboratory for Measuring and Control Technology and Instrumentations of Heilongjiang Province Harbin University of Science and Technology Harbin China

The soft fault diagnosis of nonlinear analog circuits is an important guarantee of the stable and reliable operation of electronic products. In view of the low accuracy and heavy computation load of current soft fault diagnosis methods for nonlinear analog circuits, this paper presents a soft fault diagnosis method for nonlinear analog circuits based on fractal theory. Analyzing the single-fractal and generalized multi-fractal diagnosis mechanisms, and taking the fault signal as an example, the proposed method calculate the fractal dimension of the fault signal by the single-fractal box dimension and generalized multi-fractal dimension calculation method, and analyzes the influence of different frequency input signals on the features of the fault state signal through experimental simulation. It is concluded that the increasing frequency of the input signal has little effect on the fractal characteristics of the fault signal. Comparing the single-fractal and the generalized multi-fractal diagnosis method, the author discovers that the effect is better when generalized multi-fractal dimension sequence is used to diagnose the circuit fault.

关键词： Failure analysis

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A 13.8-W, high-efficiency, α-cut Tm, Ho:YAP laser pumped by two laser diodes

A 13.8-W, high-efficiency, α-cut Tm, Ho:YAP laser pumped by...

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International Conference on Optical Communications and Networks (ICOCN)

作者： Linjun Li Xining Yang Guangchao Ye Long Zhou Yunfeng Bai Heilongjiang Province Optoelectronics and Laser Technology Key Laboratory Heilongjiang Institute of Technology Harbin China Higher Educational Key Laboratory for Measuring & Control Technology and Instrumentations of the Heilongjiang Province Harbin University of Science and Technology Harbin China

ISBN: (纸本)9781538632741;9781538632734

We report a high-power, high-efficiency Tm, Ho:YAlO 3 (Tm, Ho:YAP) laser pumped by two laser diodes. The Tm (5 at.%) and Ho (0.5 at.%):YAP crystal is cut along the a axes, and the resulting crystals are measured 4 × 4 × 8 mm 3 . The laser crystal is double end-pumped by two 18.0-W fiber-coupled laser diodes at 793.6 nm, and the output power of the Tm, Ho:YAP laser is 13.8W in continuous wave (CW) mode operation. An optical-optical conversion efficiency of 38.3% is acquired, corresponding to a slope efficiency of 40.6%.

关键词： Laser excitation Pump lasers Semiconductor lasers Laser theory Power lasers Power generation Laser modes

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Projecting distortion calibration and evaluation of coding fringes in structured light system 2nd

Projecting distortion calibration and evaluation of coding f...

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2nd International Conference on Young Computer Scientists, Engineers and Educators, ICYCSEE 2016

作者： Wu, Haibin Xu, Qing Wu, Xi Sun, Guanglu Yu, Xiaoyang Sun, Xiaoming The Higher Educational Key Laboratory for Measuring and Control Technology and Instrumentations of Heilongjiang Province Harbin University of Science and Technology Harbin150080 China

ISBN: (纸本)9789811020520

Coded structured light is an accurate, fast 3D measurement approach with high sampling density, of which the encoded fringes are distorted when projected to curved surface. Focused on the demand of encoding, decoding, multiview registration and system calibration, we expect to obtain undistorted fringes from camera image. Therefore, in this paper, we analyze the accuracy and sampling density of projecting distortion calibration approach based on control point and fitting surface. Moreover, combining the characteristic of coded structured light system, we design encoded fringe projecting distortion calibration scheme based on simplified encoded structured light model. Primarily, we neglect the minor parameters that affect the calibration in structured light model to reduce complexity. Then, we build the correspondence between camera image points and projector image points and achieve the calibration. Finally, we design evaluation scheme of projecting distortion calibration with parallelism and equal interval, and verify the effectiveness and accuracy of the approach through visual effect and experimental data. © Springer Science+Business Media Singapore 2016.

关键词： Calibration

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Design of an static reconfiguration based on FPGA system

International Journal of Multimedia and Ubiquitous Engineeri...

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International Journal of Multimedia and Ubiquitous Engineering 2016年第2期11卷 99-106页

作者： Wu, Li-Hua Zhang, Xu-Zhang Pan, Xiao-Lei Wu, Meng-Yuan The higher educational key laboratory for Measuring and Control Technology Instrumentations of Heilongjiang Province Harbin University of Science and Technology Harbin China

Aiming at the problem of limited logical resources of FPGA and low rates of internal resource utilization, the design of the static reconfiguration system was introduced in this paper. Based on the structure of CPLD matching FPGA, the static reconfiguration system is able to enhance the scalability of the FPGA device. Major functionality in the static reconfiguration system is accomplishing field reconfiguration of the FPGA device without PC. Users are able to flexibly change the different configuration files in FPGA for that the internal resources of FPGA are occupied by the configuration files of different function at different times. The experimental results showed that the system achieved dynamic switching between different logic function and time division multiplexing of internal resources. The generality of FPGA and the rates of internal resource utilization were improved and the power dissipation was reduced by this design. © 2016 SERSC.

关键词： Field programmable gate arrays (FPGA)

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The real time infrared image acquisition and processing system design based on FPGA

International Journal of Multimedia and Ubiquitous Engineeri...

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International Journal of Multimedia and Ubiquitous Engineering 2016年第2期11卷 297-308页

作者： Jianying, Fan Xin, Cui Zhigang, Fan Yao, Feng The Higher Educational Key Laboratory for Measuring and Control Technology Instrumentations of Heilongjiang Province Harbin University of Science and Technology Harbin China

Field programmable gate array (FPGA) has the characteristics of high speed, low power consumption, high integration, flexibility and, small size, etc. In this paper, I design a real time infrared image processing and display system based on FPGA for the requirement of real time infrared image processing, which will realize the transmission, transformation, and storage of the image information, and then complete the infrared image edge detection based on Sobel algorithm by using this system as a platform. At last, the advantages of infrared image processing with this system compared with other methods will be verified in this paper. The experimental results show that the system spends 11.44ms on processing the colorful image whose resolution is 640×*** system has realized the real time, high speed, stable and reliable acquisition, processing and display of infrared image and we can realize the infrared target feature extraction, recognition and tracking when we combine the system with other algorithms. © 2016 SERSC.

关键词： Edge detection

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Study of Fuzzy PID control System for the Product Oil Pipe-convey

Study of Fuzzy PID Control System for the Product Oil Pipe-c...

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2016 Sixth International Conference on instrumentation and Measurement,Computer,Communication and control (IMCCC2016)(第六届仪器测量、计算机通信与控制国际会议)

作者： Zhongming Luo Hailin Lv Yibo Ma Zhuofu Liu Huifang Yuan The higher educational key laboratory for Measuring &Control Technology and Instrumentations of Heil Department of Communication and Promotion Harbin Research Institute of Electrical Instrumentation Ha

ISBN: (纸本)9781509011964

Oil is one of the most important energy sources in the world,due to the uneven distribution of it,its transportation is an important step in the process of oil *** the development of information technology,the traditional way of pipeline transportation has been unable to meet the requirement of high speed and high accuracy of product oil transportation process.A fuzzy PID control system in the product oil pipeconvey is designed in this paper,industrial control computer,programmable logic controller and KingView are used in the system for monitoring the oil transportation process on the *** the hysteresis character of pipeline pressure and oil flow rate,fuzzy PID is used in the system for reducing overshoot and improving control *** with programmable logic controller,KingView configuration software and fuzzy PID algorithm,the system has the advantages of easy operation,high reliability and easy *** put the system into production,the result shows that: the system has high reliability and high control accuracy;it can meet the requirements of the transmission of product oil.

关键词： Pipe-convey Monitoring system fuzzy PID

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Infrared camera calibration in the 3D temperature field reconstruction

International Journal of Multimedia and Ubiquitous Engineeri...

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International Journal of Multimedia and Ubiquitous Engineering 2016年第6期11卷 27-34页

作者： Xiaoming, Sun Haibin, Wu Wei, Wang Liubo Guoguang, Cui The higher Educational Key Laboratory for Measuring & Control Technology and Instrumentations Harbin University of Science and Technology HarbinHeilongjiang Province150080 China

In order to reconstruct the 3D temperature field based on the binocular vision system, we carry out a research on the calibration of the infrared camera. To start with, we make a calibration board which can be clearly identified by the infrared camera;then, with the help of OpenCV, we implement the calibration of two infrared cameras respectively and rectify the infrared images. According to the parameters obtained from the single infrared camera calibration, we accomplish the stereo calibration. The experimental results show that the average reprojecting error is below 0.14 pixels and when using the system to carry out a real measurement, the average error is 3.12%. The feasibility of the proposed calibration approach is verified, the experimental measurement results is close to the ground truth. © 2016 SERSC.

关键词： Calibration

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Projecting Distortion Calibration and Evaluation of Coding Fringes in Structured Light System

Projecting Distortion Calibration and Evaluation of Coding F...

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The Second International Conference of Young Computer Scientists, Engineers and Educators,ICYCSEE 2016

作者： Haibin Wu Qing Xu Xi Wu Guanglu Sun Xiaoyang Yu Xiaoming Sun The Higher Educational Key Laboratory for Measuring and Control Technology and Instrumentations of Heilongjiang Province Harbin University of Science and Technology

Coded structured light is an accurate, fast 3D measurement approach with high sampling density, of which the encoded fringes are distorted when projected to curved surface. Focused on the demand of encoding, decoding, multiview registration and system calibration, we expect to obtain undistorted fringes from camera image. Therefore, in this paper, we analyze the accuracy and sampling density of projecting distortion calibration approach based on control point and fitting surface. Moreover, combining the characteristic of coded struc-tured light system, we design encoded fringe projecting distortion calibration scheme based on simplified encoded structured light model. Primarily, we neglect the minor parameters that affect the calibration in structured light model to reduce complexity. Then, we build the correspondence between camera image points and projector image points and achieve the calibration. Finally, we design eval-uation scheme of projecting distortion calibration with parallelism and equal interval, and verify the effectiveness and accuracy of the approach through visual effect and experimental data.

关键词： Coded structured light Projecting distortion Geometric calibration Encoded fringe

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Research on the working-wavelength selection method of the MSP non-source temperature calibration method based on cuvre similarity principle

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International Journal of Future Generation Communication and Networking 2016年第1期9卷 243-252页

作者： Kun, Sun Jia, Yu Hui, Sun Wei, Li The Higher Educational Key Laboratory for Measuring and Control Technology and Instrumentations of Heilongjiang Province Harbin University of Science and Technology Harbin China

In the field of multi-spectral temperature measurement, the high-temperature blackbody furnace is applied to calibrate the multi-spectral pyrometer (MSP). The material of the blackbody furnace is graphite and its melting point is 3000 °C. As a result, the MSP is not able to be calibrated above 3000 °C (non-source temperature) and the measurement range of MSP is limited to lower than 3000°C. Currently, the needs of the temperature measurement above 3000 °C are gradually increasing. To solve the problem above, the non-source temperature calibration method based on curve similarity principle (NCCSP) is proposed. The core idea of the NCCSP is that the mathematical model is formed based on curve similarity of the MSP output and the power function and then the derivative fitting which can control the curve trend well is applied to obtain model parameters to achieve the purpose that apply the calibration data below 3000 °C to predict the calibration data above 3000 °C. The NCCSP is significance to expand multi-spectral pyrometer measurement range and supplement multispectral temperature measurement theory. The working-wavelength number of MSP is from a few to hundreds, under which the NCCSP is more accurate needs to be further researched. Therefore, in this paper, the impacts on the NCCSP accuracy of the working-wavelength selection are researched. Combine with Planck’s law by theoretical simulation method to get the working-wavelength selection basis. © 2016 SERSC.

关键词： Calibration

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