检索结果-内蒙古大学图书馆

Design of a flyback switching power for smart meter

International Journal of Smart Home 2016年第9期10卷 207-216页

作者： Jian-Ying, Fan Yu-Ling, Zhang Dong-Qing, Shi The higher educational key labortory School of Measure-control Technology and Communication Engineering of Heilongjiang Province Harbin University of Science and Technology Harbin150080 China Heilongjiang Province Electronic Information Products Supervision Inspection Institute Harbin150080 China

With switching power supply being widely used in Smart Meter, there exists more restrictions on the performance of it. This paper designs a single-ended flyback switching power supply based on LNK364DN chips which is used in intelligent single-phase table, Compares the advantages and disadvantages of the switching power supply and the traditional linear regulated power supply, and introduces the reaction type switching power supply design principle and working process. In order to satisfy the security requirements, this paper also designs the EMI suppression circuit, surge suppression current, clamp circuit, etc. The design process, including the maximum duty cycle including transformer, the primary inductance calculation, etc, of the flyback type switch power supply transformer is introduced in detail. The experimental results show that the switch regulated power supply has small volume, good electromagnetic compatibility, small ripple, low power consumption, high efficiency of AC/DC transform and excellent performance .

关键词： Energy efficiency

来源：评论

学校读者我要写书评

暂无评论

Integrated navigation for pedestrian with building heading algorithm and inertial measurement unit

Integrated navigation for pedestrian with building heading a...

引用

International Conference on control, Automation and Information Sciences (ICCAIS)

作者： Yingbo Cai Qian Sun Ya Zhang Chunzhu Yu Hongmei Bai School of Electrical Engineering and Automation Harbin Institute of Technology Harbin China College of Information and Communication Engineering Harbin Engineering University Harbin China Beijing Aerospace Automatic Control Research Institute Beijing China College of Automation Harbin Engineering University Harbin China

ISBN: (纸本)9781509006519

To improve the positioning accuracy in indoor environments, we use the Inertial Navigation System (INS) algorithm to perform the pedestrian tracking, and the measurements consist of two parts: the velocity error and the heading error. The velocity error can be gotten from the navigation result. Meanwhile, we get the heading error in two ways. First, taking the magnetometer as the heading resource, the magnetic perturbations can be eliminated through a new ellipsoid fitting based calibration algorithm. Furthermore, the building heading algorithm(BHA) is also adopted to aid the Inertial measurement Unit (IMU), the corresponding building heading can be derived based on the motion path. Finally, the Kalman filter (KF) is utilized to fuse the data in order to compensate the sensor error and navigation solution through a 15-dimentional state vector. As a result, some field trials were taken to prove the validity of the proposed algorithm. By contrast the result of Magnetometer (MAG)/BHA/INS and the Zero Velocity update (ZUPT) algorithms, we proved that the algorithm of MAG/BHA aiding INS can effectively improve the indoor positioning accuracy which shows better performance.

关键词： Navigation Magnetometers Buildings Micromechanical devices Calibration Automation Conferences

来源：评论

学校读者我要写书评

暂无评论

Inertial navigation system positioning assisted by star sensor

Inertial navigation system positioning assisted by star sens...

引用

International Conference on control, Automation and Information Sciences (ICCAIS)

作者： Hongsong Du Qian Sun Ya Zhang Zhao Qi Ya Wen Navy Academy of Armament The Research Institute of Ships Beijing China College of Information and Communication Engineering Harbin Engineering University Harbin China School of Electrical Engineering and Automation Harbin Institute of Technology Harbin China Beijing Aerospace Automatic Control Research Institute Beijing China

ISBN: (纸本)9781509006519

The Star Sensor can be used to assist the inertial navigation system (INS) for navigation and positioning, restraining the accumulated error caused by the inertial components. During the integrated navigation process, the Star Sensor is installed above the INS, generated installation errors between the INS body coordinate system and the Star Sensor body coordinate system. In order to increase the system accuracy, a new gyro error model is established in this paper which taken full account of various error factors. The gyro drifts and the gyro errors coefficients are considered as the state variables. The attitude information of Star Sensor is used as the high-accurate information to construct the observation with the attitude information of INS. Taken the nonlinearity of the actual system into account, the nonlinear filter Cubature Kalman Filter (CKF) is used to estimate the gyro errors commendably. The experiment results showed that the positioning error reduced a lot by utilizing this novel method.

关键词： Mathematical model Inertial navigation Calibration Satellite navigation systems Automation Quaternions

来源：评论

学校读者我要写书评

暂无评论

A JPSO algorithm for SML estimation of DOA

A JPSO algorithm for SML estimation of DOA

引用

International Symposium on communications and Information Technologies (ISCIT)

作者： Haihua Chen Shibao Li Jianhang Liu Chen Gong Fen Liu Masakiyo Suzuki College of Computer and Communication Engineering China University of Petroleum Qingdao Shandong College of Information and Control Engineering China University of Petroleum Qingdao Shandong China Graduate School of Engineering Kitami Institute of Technology Kitami Hokkaido Japan

ISBN: (纸本)9781509041008

The estimation of DOA is an important problem in sensor array signal processing and its industrial applications. Among all the solving techniques for DOA, the Stochastic Maximum Likelihood (SML) algorithm is well-known for its high accuracy of DOA estimation. However, its computational complexity is very high because a multi-dimensional nonlinear optimization problem is involved. The Particle Swarm Optimization (PSO) algorithm is considered as a rather efficient way for multi-dimensional non-linear optimization problems in DOA estimation. However Conventional PSO algorithm usually needs a large number of particles and the iteration number is also a litter high when all the particles converge. As a result, the computational complexity is still a litter high. This paper proposes a low complexity Joint-PSO (JPSO) algorithm for SML estimation. It uses the solution of Estimation of Signal Parameters via Rotational Invariance Techniques (ESPRIT) and stochastic Cramer-Rao bound (CRB) to determine a novel initialization space. In this case, smaller number of particles and less iteration number are required. Therefore, the computational complexity can be greatly reduced. Simulation results are also shown to demonstrate the validity of proposed JPSO algorithm.

关键词： Direction-of-arrival estimation Computational complexity Signal processing algorithms Covariance matrices Sensor arrays Maximum likelihood estimation

来源：评论

学校读者我要写书评

暂无评论

Vibration diagnostic method based on improved intrinsic time-scale decomposition and energy operator demodulation for fault diagnosis of helicopter planetary gearboxes

Vibration diagnostic method based on improved intrinsic time...

引用

Prognostics and System Health Management Conference (PHM)

作者： Canfei Sun Youren Wang Yan Zhang College of Automation Engineering Aviation Key Laboratory of Science and Technology on Fault Diagnosis and Health Management Nanjing China College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing China Research Center Shanghai Aero Measurement & Control Technology Research Institute Shanghai China

ISBN: (纸本)9781509027798

Planetary gearboxes play a significant role in helicopter transmission system. Fault diagnosis of planetary gearboxes is a key topic for health monitoring and maintenance of helicopter. The vibration signals of faulty planetary gearboxes have complicated spectral structures due to its distinctive and complex structure and time-variant running operation condition, leading to the difficulty in fault diagnosis of planetary gearboxes. Considering that both the amplitude envelope and the instantaneous frequency of vibration signals are associated with the characteristic frequency of the faulty gear, we propose a vibration diagnostic method using the amplitude and frequency demodulation analysis. First, the vibration signal was decomposed into several proper rotation components (PRs) and a trend component by the improved intrinsic time-scale decomposition (IITD) method. Then the energy operator method was exploited to estimate the amplitude envelope and instantaneous frequency of the PR which contained obvious impacts. Finally, by analyzing the dominant peaks in the Fourier spectra of the demodulated amplitude envelope and instantaneous frequency with the theoretical characteristic frequency of each gear, we can diagnose planetary gearbox faults. The effectiveness of the proposed method is demonstrated by simulated signal analysis, and is validated by experimental signal analysis of a lab planetary gearbox with sun gear faults including a chipped tooth and a missing tooth.

关键词： Gears Frequency modulation Sun Vibrations Helicopters Demodulation Fault diagnosis

来源：评论

学校读者我要写书评

暂无评论

Near-infrared down-conversion in Eu3+/Yb3+codoped Ba4La6O（SiO4）6 glass ceramics

Near-infrared down-conversion in Eu3+/Yb3+codoped Ba4La6O（S...

引用

The 24th International Congress on Glass

作者： W.J.Zhang L.J.Wu Y.Y.Yu X.Z.Wang S.Q.Liu W.C.Wang Y.Liu Q.Y. Zhang School of Material Science and Engineering and Shandong Provincial Key Lab of Preparation and Measurement of Building Materials University of Jinan State Key Lab of Luminescent Materials and Devices and Institute of Optical Communication Materials South China University of Technology

The main obstacle faced in developing low cost-efficient solar cell stems from the spectral mismatch between the incident solar spectrum and the spectral response of solar ***,the resultant energy loss can be

关键词： SiO4 Near-infrared down-conversion in Eu codoped Ba4La6O glass ceramics

来源：评论

学校读者我要写书评

暂无评论

A realization method of rotating speed measurement based on different M/T

引用

AIP Conference Proceedings 2017年第1期1829卷

作者： Jingbo Xu Xianyu Yin Xiaomeng Cui Zhiliang Liu 1School of Measure-control Technology & Communication Engineering Harbin University of Science and Technology Harbin Heilongjiang 150080 China 2State Key Laboratory of Hydropower Equipment Harbin Institute of Large Electrical Machinery Harbin Heilongjiang 150046 China

A realization method for rotating speed measurement is put forward in this paper. Timer 1 of STM32F103 is used to count the external pulses and its timer 2 is used to count the internal clock pulses. Two timers are set in master-slaver synchronous mode, and the rotating speed is computed based on different M/T method. This realization method can ensure the two timers strictly synchronously work, and the counting value of the master timer can also be set dynamically according to rotating speed. This method has high measurement accuracy and wide measurement range, and is easy to realize.

关键词：

来源：评论

学校读者我要写书评

暂无评论

State estimation with quantized innovations in wireless sensor networks: Gaussian mixture estimator and posterior Cramér–Rao lower bound

引用

Chinese Journal of Aeronautics 2015年第6期28卷 1735-1746页

作者： Zhang Zhi Li Jianxun Liu Liu Liu Zhaolei Han Shan Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China Nanjing Research Institute of Electronics Technology Engineering Research Center of Wideband Wireless Communication Technology Ministry of EducationNanjing University of Posts and Telecommunications

Since the features of low energy consumption and limited power supply are very impor- tant for wireless sensor networks （WSNs）, the problems of distributed state estimation with quan- tized innovations are investigated in this paper. In the first place, the assumptions of prior and posterior probability density function （PDF） with quantized innovations in the previous papers are analyzed. After that, an innovative Gaussian mixture estimator is proposed. On this basis, this paper presents a Gaussian mixture state estimation algorithm based on quantized innovations for WSNs. In order to evaluate and compare the performance of this kind of state estimation algo- rithms for WSNs, the posterior Cram6r-Rao lower bound （CRLB） with quantized innovations is put forward. Performance analysis and simulations show that the proposed Gaussian mixture state estimation algorithm is efficient than the others under the same number of quantization levels and the performance of these algorithms can be benchmarked by the theoretical lower bound.

关键词： Posterior Cramer-Rao lower bounds Quantiation State estimation Target tracking Wireless sensor network

来源：评论

学校读者我要写书评

暂无评论

A new important-place identification method

A new important-place identification method

引用

IEEE International Conference on Computer and communications, ICCC 2015

作者： Ma, Chun-Lai Ma, Tao Shan, Hong Electronic Engineering Institute Hefei China Science and Technology on Communication Information Security Control Laboratory Hefei China

ISBN: (纸本)9781467381253

For the problem that the location of LBSN users was sparse because of it was updated sporadically. An important place identification method was studied by improving the clustering algorithm. Firstly, a velocity pruning algorithm was applied to remove interference points from source data. Secondly, clustering algorithm based on density peak named CFSFDP was selected. To solve the problem that it is unable to decide the cluster number with CFSFDP, an improved algorithm was presented. With a cluster center automatic choosing strategy, the algorithm searched for the 'turning points' with the trends of cluster center weights changing. Then we could regard a set of points which weight is bigger than turning points' as cluster center. As a result, the error brought by ruling in the Decision Graph could be avoided with the strategy. Thirdly, reverse geocoding technology was applied to translate coordinate in semantic place. Check-in data of Foursquare user was set as an example in experiment, the result show that the improved algorithm had higher accuracy rate and lower computation compared to CFSFDP and DBSCAN. It also proved that the feasibility and effectiveness of the method proposed in the paper. © 2015 IEEE.

关键词： Clustering algorithms

来源：评论

学校读者我要写书评

暂无评论

A new method of active power measurement under the conditions of distortion signals based on multiple wavelets

引用

International Journal of Hybrid Information technology 2015年第6期8卷 269-278页

作者： Xiaobing, Zhang Hongguang, Li Wei, Cao Institute of Measurement Control Technology and Communication Engineering University of Science and Technology Harbin150080 China

It is discussed that a new method for active power measurement under the conditions of distortion signals. Accurate measurement of the power consumed by the distorted signals has been focused on in recent years due to its practical utilities. In this work, a mathematical description of powers is deducted in the conditions of distorted signals according to a simplified model of the electrical network. Then, a rational measuring method of the electric energy for distorted signals is proposed on the basis of the analysis of the power flow. Also, a measuring method based on multiple wavelets was employed for measuring the active power in the conditions of unsteady distorted signals. Experimental results demonstrate that, by using the simulated typical distorted signals, the proposed measurement method can produce extremely accurate results compared to theoretical results. © 2015 SERSC.

关键词： Wavelet transforms

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：