检索结果-内蒙古大学图书馆

第四届国际自动化测试与仪器仪表学术会议

作者： Xu Xiaoli Jiang Zhanglei Chen Peng School of Mechanical and Vehicle Engineering Beijing Institute of Technology Key Laboratory of Modern Measurement & Control Technology Ministry of EducationBeijing Information Science and Technology University Department of Environmental Science and Engineering Faculty of Bio-resources Mie University

In order to carry out safety protection in advance and implement predictive maintenance,and also to prevent accident occurrence by using fault prediction method to reveal the fault feature.A fault prediction method faced to internal combustion engine group based on Internet of Things(IOT) is ***'s beneficial to improve the operation stability of key equipment group and promote the emerging IOT technology application in equipment *** fault prediction model mainly includes the system of remote online sample acquisition based on IOT,constructing fault prediction model coupling the physical information and numerical rules information of the mechanical systems,both to reflect the physical nature of the mechanical system,but also reflects the fault indicates numerical rules of the mechanical *** feature is used to predict fault trend in order to ensure safe and stable operation of internal combustion engine group.

关键词： internal combustion engine IOT feature extraction fault prediction

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Application study on distribution network operations management system based on smart phones

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Journal of Convergence Information technology 2012年第23期7卷 476-483页

作者： Yi, Jianbo Li, Yongbin Huang, Qi He, Sihai Sichuan Provincial Key Laboratory of Power System Wide-Area Measurement and Control University of Electronic Science and Technology of China UESTC Chengdu Sichuan Province 611731 China Jianyang Power Supply Bureau Sichuan Electric Power Company Jianyang Sichuan Province 641400 China

An application system of distribution network field operation and management (DNFQMS) based on smart phones and hybrid network communication technology is presented in this paper. The distribution network operation and maintenance management as an important part of the security of electricity supply is required to have high efficiency and reliability. In order to overcome the low efficiency and less standardized problems in traditional distribution network operation and maintenance, the novel DNFQMS proposed employs smart phones equipped with windows mobile operation system and mobile communication with general packet radio service (GPRS), then utilizes Internet to constructive web servers and mobile clients information system. The first step is to develop smart phones application software, which uses C# language to implement the field operations data real-time collection and process. The second step is web server design which has the ability to handle multimedia information and global position system (GPS) information. Finally, the E-sheet, multimedia and GPS data transmission technology are described in detail. Furthermore, the system performance test and the user application analysis verify the validity and reliability of the proposed system in the present paper.

关键词： Efficiency

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Fault feature extraction based on optimal energy using lifting wavelet packet

Fault feature extraction based on optimal energy using lifti...

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2011 International Conference on Information Science and technology, ICIST 2011

作者： Xu, Xiaoli Chen, Tao Wang, Shaohong Key Laboratory of Modern Measurement and Control Technology Beijing Information Science and Technology University Beijing Institute of Technology Beijing China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing China

ISBN: (纸本)9781424494408

Fault prediction is the key technology to guarantee the safe operation of large mechanical equipment,and fault feature extraction is a key issue in fault prediction. To extract fault feature from the non-stationary fault signals, this paper proposed a fault feature extraction method using lifting wavelet packet, and constructed the fault feature vector of optimal energy. The fault feature extraction analysis shows that the proposed method can highlight the energy change within the optimal decomposition frequency band, and effectively reflect the fault status. © 2011 IEEE.

关键词： Feature extraction

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Creation and integration mechanism of instrumentation flexible developing system

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机械工程前沿 2011年第2期6卷 235-240页

作者： Xiaoli XU Qiushuang LIU Beijing Key Laboratory Measurement and Control of Mechanical and Electrical System Beijing Information Science & Technology University Beijing 100092 China School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081 China Beijing Key Laboratory Measurement and Control of Mechanical and Electrical System Beijing Information Science & Technology University Beijing 100092 China

To solve many key technical problems during the development of modern instrumentation system integration and provide a new mode and fundamental technical equipment for the research and development (R&D) of modern instrumentation products, based on the concept of an instrumentation flexible developing system (IFDS), this paper discusses the creation and open flexible integration mechanism, perfects the integrated supporting environment and integrated system of the flexible interconnection, and constructs the new flexible integrated system. Based on the operation mechanism of the modern instrumentation developing system and the research and optimization of the rapid integration design method, the paper emphasizes the dynamic integrating method of multiple types of knowledge in a modem instrument R&D system, to effectively utilize the rich integrated resource and achieve rapid integration of the system. Applications show that the new IFDS can improve the integration level and efficiency of R&D of the modern instrumentation system, enforce the reliability of the system, shorten the R&D period, and reduce the development costs.

关键词： modern instrumentation developing flexible interconnection flexible integration mechanism rapid integration system dynamic integrating method

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Research of Uninformative Variable Elimination method for spectral data analysis of milk

Research of Uninformative Variable Elimination method for sp...

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6th International Forum on Strategic technology, IFOST 2011

作者： Wang, Lijie Guo, Jianying Ding, Xibo Zhou, Zhen Bai, Yamei Qin, Yong College of Measurement and Control Technology and Communication Engineering Higher Educational Key Laboratory for Measuring and Control Technology Harbin University of Science and Technology Harbin China

ISBN: (纸本)9781457703966

During the NIR spectral analysis to quickly determine concentrations of essential components of milk, spectral region is wider, peaks are overlap, and searching space is larger, spectrum acquiring often subjects to interference coming from environmental noise and interference of other components, so it is necessary to make optimum selecting to wavelength variables. In this paper, for concentration of protein in milk samples, Uninformative Variable Elimination (UVE) method is used to make optimum selecting to wavelength variables, and the selected wavelengths are taken as the input variables to build PLS model. Prediction results of PLS model built after processed by the UVE method is respectively compared with results of the PLS model by Genetic Algorithms (GA) method and results of the PLS model without making wavelength variable selection. The result shows that the UVE-PLS model has great advantage comparing with the GA-PLS model, and using the UVE method to select the wavelength variable of milk spectrum can make variable numbers for the final PLS model become smaller, redundant information become minimize, robustness of model become steady, and testing time of spectrum acquiring become shorter. © 2011 IEEE.

关键词： Genetic algorithms

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The visualization simulation platform design of low-voltage power line carrier communication system

The visualization simulation platform design of low-voltage ...

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6th International Forum on Strategic technology, IFOST 2011

作者： Zhang, Xuhui Zhao, Yingjie Jia, Junfeng Zhang, Bin Liu, Ja Higher Educational Key Laboratory for Measuring and Control Technology Measurement-Control and Communication Institute Harbin University of Science and Technology Harbin 150080 China

ISBN: (纸本)9781457703966

There are three steps to establish the visualization simulation platform of low-voltage power line carrier communication system. Firstly, we establish the MARLAB/Simulink simulation platform to simulate low-voltage power line carrier communication system. The simulation platform bases on the analysis of power line channel characteristics and take the multipath channel transmission model of *** and ***. Then, we actually measure a large of noise, and the collected data of noise is made of MAT file. We use the SIMULINK's From File model to set up the noise simulation model based on the analysis of noise characteristics. Lastly, through the parameters of channel and simulation are inputted in the designing GUI interface in order to control the process of system simulation, we realize the visualization of system simulation based on the object-oriented thought. Based on setting up the platform, it is proof that using the adaptive OFDM technology can overcome the frequency-selective fading characteristics of power line channel transmission, enhance the system's anti-interference capability and realize the reliable high-speed data communication. © 2011 IEEE.

关键词： Orthogonal frequency division multiplexing

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Remote monitoring and control of photovoltaic system using wireless sensor network

Remote monitoring and control of photovoltaic system using w...

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International Conference on Electric Information and control Engineering

作者： Xu, Xiaoli Qiao, Daoe Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing China

ISBN: (纸本)9781424480395

Efficient energy yield is a major concern in photovoltaic systems in solar energy supply. Smart photovoltaic modules offer a potential solution to allow solar generators to maximize their productivity. This paper describes details of the design and instrumentation of smart photovoltaic modules, a wireless sensor network, and software for real-time sensing and control of a photovoltaic system with maximum power point tracking at module level. Field condition is monitored by voltage, current, irradiance, and temperature sensors distributed across the photovoltaic field. The sensory data are periodically sampled and transmitted to a base station. The power point is controlled by a integrated DC-DC converter. The output voltage in the converter is regulated by a digital controller. The reference voltage is calculated based on a neural network model, which is used to identify maximum power point. The communication data for remote monitoring and distributed control are successfully transmitted using a low-cost ZigBee wireless network. The web-based software developed in this paper offers stable remote access to field conditions and real-time control of the power points in the smart photovoltaic system. © 2011 IEEE.

关键词： Solar energy

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Comparison of neural network algorithms based on gas qualitative analysis

Comparison of neural network algorithms based on gas qualita...

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6th International Forum on Strategic technology, IFOST 2011

作者： Yu, Mingyan Shi, Yunbo Zhao, Wenjie Feng, Qiaohua Wang, Xuan Sun, Lining Measurement-control Tech and Communications Engineering College Higher Educational Key Laboratory for Measuring and Control Technology Harbin University of Science and Technology Harbin China

ISBN: (纸本)9781457703966

For the problem of gas qualitatively identify in the field of gas detection, this paper is based on the multi-sensor and pattern recognition of neural network, the uniform change voltage of the sensor output is simulated by the gradient descent algorithm, the additional momentum algorithm and the LM algorithm of neural network, then compare the three simulation results of the three algorithms, the result proves that the LM algorithm is the optimal algorithm of the data simulation in this paper, in the range of allowable error, completed the gas qualitative identification. © 2011 IEEE.

关键词： Gases

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Evaluation of upper limb muscle fatigue based on surface electromyography

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Science China(Life Sciences) 2011年第10期54卷 939-944页

作者： ZHOU QianXiang CHEN YuHong MA Chao ZHENG XiaoHui Key Laboratory of Mechanobiology and Biomechanics of Ministry of Education Beihang University Beijing 100191 China The Quartermaster Research of the General Logistics Department Beijing 100010 China Key Laboratory of Measurement and Control Technology of Ministry of Education Beijing Information Science and Technology University Beijing 100192 China

Fatigue is believed to be a major contributory factor to occupational injuries in machine *** development of accurate and usable techniques to measure operator fatigue is therefore *** this study,we used a novel method based on surface electromyography (sEMG) of the biceps brachii and the Borg scale to evaluate local muscle fatigue in the upper limb after isometric muscle *** young males performed isometric actions with the upper limb at different force *** activities of the biceps brachii were recorded during the *** scales were used to evaluate the subjective sensation of local fatigue of the biceps brachii after the *** activities were analyzed using the one-third band octave method,and an equation to determine the degree of fatigue was derived based on the relationship between the variable and the Borg *** results showed that the relationship could be expressed by a conic curve,and could be used to evaluate muscle fatigue during machine operation.

关键词： isometric muscle activity muscle fatigue one-third band octave method evaluation model for muscle fatigue

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The fabrication of array wind speed and direction sensor based on Pt film

The fabrication of array wind speed and direction sensor bas...

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6th International Forum on Strategic technology, IFOST 2011

作者： Feng, Qiaohua Shi, Yunbo Sun, Lining Higher Educational Key Laboratory for Measuring and Control Technology College of Measurement-Control Tech. and Communications Engineering Harbin University of Science and Technology Harbin China

ISBN: (纸本)9781457703966

In order to meet the measurement requirements of the two-dimensional flow field in small-scale space, a new hot film wind speed and direction sensor based on Pt film is designed in this paper. The figure of array sensor is formed by magnetron sputtering and mechanical mask, whose process is simple and has good consistensy;the insulation groove is formed by micromachining technology, which can reduce the interaction between the heating elements and thermosensitive elements, so the power consumption is reduced, and the sensitivity is improved, the measurement of low wind speed is achieved. © 2011 IEEE.

关键词： Micromachining

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