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An improved initial rotor position estimation method using high-frequency pulsating voltage injection for PMSM
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作者 Yang Jiang Ming Cheng 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2024年第3期19-29,共11页
High frequency pulsating voltage injection method is a good candidate for detecting the initial rotor position of permanent magnet synchronous motor.However,traditional methods require a large number of filters,which ... High frequency pulsating voltage injection method is a good candidate for detecting the initial rotor position of permanent magnet synchronous motor.However,traditional methods require a large number of filters,which leads to the deterioration of system stability and dynamic performance.In order to solve these problems,a new signal demodulation method is proposed in this paper.The proposed new method can directly obtain the amplitude of high-frequency current,thus eliminating the use of filters,improving system stability and dynamic performance and saving the work of adjusting filter parameters.In addition,a new magnetic polarity detection method is proposed,which is robust to current measurement noise.Finally,experiments verify the effectiveness of the method. 展开更多
关键词 Initial position detection Signal demodulation algorithm Magnetic polarity detection Filter elimination
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Detecting the Position of the Moving-iron Solenoid by Non-displacement Sensor Based on Parameter Identification of Flux Linkage Characteristics
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作者 WANG Xuping QUAN Long XIONG Guangyu 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2013年第6期1204-1211,共8页
Currently, most researches use signals, such as the coil current or voltage of solenoid, to identify parameters; typically, parameter identification method based on variation rate of coil current is applied for positi... Currently, most researches use signals, such as the coil current or voltage of solenoid, to identify parameters; typically, parameter identification method based on variation rate of coil current is applied for position estimation. The problem exists in these researches that the detected signals are prone to interference and difficult to obtain. This paper proposes a new method for detecting the core position by using flux characteristic quantity, which adds a new group of secondary winding to the coil of the ordinary switching electromagnet. On the basis of electromagnetic coupling theory analysis and simulation research of the magnetic field regarding the primary and secondary winding coils, and in accordance with the fact that under PWM control mode varying core position and operating current of windings produce different characteristic of flux increment of the secondary winding. The flux increment of the electromagnet winding can be obtained by conducting time domain integration for the induced voltage signal of the extracted secondary winding, and the core position from the two-dimensional fitting curve of the operating winding current and flux-linkage characteristic quantity of solenoid are calculated. The detecting and testing system of solenoid core position is developed based on the theoretical research. The testing results show that the flux characteristic quantity of switching electromagnet magnetic circuit is able to effectively show the core position and thus to accomplish the non-displacement transducer detection of the said core position of the switching electromagnet. This paper proposes a new method for detecting the core position by using flux characteristic quantity, which provides a new theory and method for switch solenoid to control the proportional valve. 展开更多
关键词 switch solenoid flux characteristic quantity position detection non-displacement sensor
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An artificial neural network for detecting weld position in arc welding process
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作者 高向东 黄石生 余英林 《China Welding》 EI CAS 1999年第1期76-82,共7页
A kind of self organizing artificial neural network used for weld detection is presented in this paper, and its concepts and issues are discussed. The network can transform the weld visual information into typical pa... A kind of self organizing artificial neural network used for weld detection is presented in this paper, and its concepts and issues are discussed. The network can transform the weld visual information into typical patterns and match with the weld data collected on line, and so realize the accurate detection of the weld position in arc welding process. 展开更多
关键词 artificial neural networks self adaptive resonance theory VISION weld position detection
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In-pit coal mine personnel uniqueness detection technology based on personnel positioning and face recognition 被引量:11
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作者 Sun Jiping Li Chenxin 《International Journal of Mining Science and Technology》 SCIE EI 2013年第3期357-361,共5页
Since the coal mine in-pit personnel positioning system neither can effectively achieve the function to detect the uniqueness of in-pit coal-mine personnel nor can identify and eliminate violations in attendance manag... Since the coal mine in-pit personnel positioning system neither can effectively achieve the function to detect the uniqueness of in-pit coal-mine personnel nor can identify and eliminate violations in attendance management such as multiple cards for one person, and swiping one's cards by others in China at present. Therefore, the research introduces a uniqueness detection system and method for in-pit coal-mine personnel integrated into the in-pit coal mine personnel positioning system, establishing a system mode based on face recognition + recognition of personnel positioning card + release by automatic detection. Aiming at the facts that the in-pit personnel are wearing helmets and faces are prone to be stained during the face recognition, the study proposes the ideas that pre-process face images using the 2D-wavelet-transformation-based Mallat algorithm and extracts three face features: miner light, eyes and mouths, using the generalized symmetry transformation-based algorithm. This research carried out test with 40 clean face images with no helmets and 40 lightly-stained face images, and then compared with results with the one using the face feature extraction method based on grey-scale transformation and edge detection. The results show that the method described in the paper can detect accurately face features in the above-mentioned two cases, and the accuracy to detect face features is 97.5% in the case of wearing helmets and lightly-stained faces. 展开更多
关键词 Coal mine Uniqueness detection Recognition of personnel positioning cards Face recognition Generalized symmetry transformation
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Visual positioning of rectangular lead components based on Harris corners and Zernike moments 被引量:4
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作者 王祖进 黄筱调 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第7期2586-2595,共10页
With the increasing necessities for reliable printed circuit board(PCB) product, there has been a considerable demand for high speed and high precision vision positioning system. To locate a rectangular lead component... With the increasing necessities for reliable printed circuit board(PCB) product, there has been a considerable demand for high speed and high precision vision positioning system. To locate a rectangular lead component with high accuracy and reliability, a new visual positioning method was introduced. Considering the limitations of Ghosal sub-pixel edge detection algorithm, an improved algorithm was proposed, in which Harris corner features were used to coarsely detect the edge points and Zernike moments were adopted to accurately detect the edge points. Besides, two formulas were developed to determine the edge intersections whose sub-pixel coordinates were calculated with bilinear interpolation and conjugate gradient method. The last experimental results show that the proposed method can detect the deflection and offset, and the detection errors are less than 0.04° and 0.02 pixels. 展开更多
关键词 visual positioning Harris corners Zernike moments edge detection sub-pixel image registration
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X-ray detection based on complementary metal-oxide-semiconductor sensors
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作者 Qian-Qian Cheng Chun-Wang Ma +3 位作者 Yan-Zhong Yuan Fang Wang Fu Jin Xian-Feng Liu 《Nuclear Science and Techniques》 SCIE CAS CSCD 2019年第1期43-48,共6页
Complementary metal-oxide-semiconductor(CMOS) sensors can convert X-rays into detectable signals; therefore, they are powerful tools in X-ray detection applications. Herein, we explore the physics behind X-ray detecti... Complementary metal-oxide-semiconductor(CMOS) sensors can convert X-rays into detectable signals; therefore, they are powerful tools in X-ray detection applications. Herein, we explore the physics behind X-ray detection performed using CMOS sensors. X-ray measurements were obtained using a simulated positioner based on a CMOS sensor, while the X-ray energy was modified by changing the voltage, current, and radiation time. A monitoring control unit collected video data of the detected X-rays. The video images were framed and filtered to detect the effective pixel points(radiation spots).The histograms of the images prove there is a linear relationship between the pixel points and X-ray energy. The relationships between the image pixel points, voltage, and current were quantified, and the resultant correlations were observed to obey some physical laws. 展开更多
关键词 X-ray detection SIMULATED positionER COMPLEMENTARY METAL-OXIDE-SEMICONDUCTOR sensor Effective PIXEL POINTS
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Contrastive study of HIV RNA detection and RIBA test in anti-HIV repeated positive donors
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《中国输血杂志》 CAS CSCD 2001年第S1期405-,共1页
关键词 RIBA HIV Contrastive study of HIV RNA detection and RIBA test in anti-HIV repeated positive donors RNA
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Analysis and Design of Surgical Instrument Localization Algorithm 被引量:1
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作者 Siyu Lu Jun Yang +4 位作者 Bo Yang Zhengtong Yin Mingzhe Liu Lirong Yin Wenfeng Zheng 《Computer Modeling in Engineering & Sciences》 SCIE EI 2023年第10期669-685,共17页
With the help of surgical navigation system,doctors can operate on patients more intuitively and accurately.The positioning accuracy and real-time performance of surgical instruments are very important to the whole sy... With the help of surgical navigation system,doctors can operate on patients more intuitively and accurately.The positioning accuracy and real-time performance of surgical instruments are very important to the whole system.In this paper,we analyze and design the detection algorithm of surgical instrument location mark,and estimate the posture of surgical instrument.In addition,we optimized the pose by remapping.Finally,the algorithm of location mark detection proposed in this paper and the posture analysis data of surgical instruments are verified and analyzed through experiments.The final result shows a high accuracy. 展开更多
关键词 Surgical navigation system surgical instruments positioning positioning mark detection algorithm matching algorithm posture analysis
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FPC-BTB detection and positioning system based on optimized YOLOv5
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作者 Changyu Jing Tianyu Fu +2 位作者 Fengming Li Ligang Jin Rui Song 《Biomimetic Intelligence & Robotics》 EI 2023年第4期56-66,共11页
With the aim of addressing the visual positioning problem of board-to-board(BTB)jacks during the automatic assembly of flexible printed circuit(FPC)in mobile phones,an FPC-BTB jack detection method based on the optimi... With the aim of addressing the visual positioning problem of board-to-board(BTB)jacks during the automatic assembly of flexible printed circuit(FPC)in mobile phones,an FPC-BTB jack detection method based on the optimized You Only Look Once,version 5(YOLOv5)deep learning algorithm was proposed in this study.An FPC-BTB jack real-time detection and positioning system was developed for the real-time target detection and pose output synchronization of the BTB jack.On that basis,a visual positioning experimental platform that integrated a UR5e manipulator arm and Hikvision industrial camera was built for BTB jack detection and positioning experiments.As indicated by the experimental results,the developed FPC-BTB jack detection and positioning system for BTB target recognition and positioning achieved a success rate of 99.677%.Its average detection accuracy reached 99.341%,the average confidence of the detected target was 91%,the detection and positioning speed reached 31.25 frames per second,and the positioning deviation was less than 0.93 mm,which conforms to the practical application requirements of the FPC assembly process. 展开更多
关键词 detection and positioning systems Deep learning Small target detection Posture estimation Flexible printed circuit
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多工位变位器的精度检测
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作者 王俊 《模具制造》 2023年第5期131-133,共3页
运用视觉检测系统替代传统的激光跟踪仪检测装置,高效、精准的实现了多工位变位器的重复定位精度的检测,提高生产率、降低工装成本,促进了多工位变位器在生产线中的推广。
关键词 变位器 视觉系统 精度检测
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A Method of Measuring Large Displacement and Deformation with High Precision *
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作者 杨勇 钟秉林 +1 位作者 何小元 杨汉国 《Journal of Southeast University(English Edition)》 EI CAS 1998年第1期53-56,共4页
A CCD position detecting system measuring the displacement and deformation of structure is presented. The measure method takes advantage of the position detecting technique based on digital image processing. A bright ... A CCD position detecting system measuring the displacement and deformation of structure is presented. The measure method takes advantage of the position detecting technique based on digital image processing. A bright spot is pegged on the object to be measured and imaged to the target of CCD camera through a telescopic lens. The CCD target converts the optical signal to equivalent electric signal. The video frequency signal is digitized to an array of 512×512 pixels by the analog to digital converter (ADC), then transmitted to the computer. The computer controls the data acquisition, conducts image processing and detects the location of the target spot. Comparing the current position with the original position of the spot, the displacement of object is obtained. With the aid of analysis software, the system can achieve the resolution of 0 01 mm in the 6 m distance from the object to the point of observation. To meet the need of practice, the measuring distance can be extended to 100 m or even farther. 展开更多
关键词 DISPLACEMENT DEFORMATION CCD position detection long distance measurement
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阀门定位器阀位检测与压电阀驱动电路设计 被引量:3
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作者 张卫华 江李丽 廖宣亮 《铜业工程》 CAS 2011年第1期61-65,共5页
本文主要介绍定位器两大模块:阀位检测电路模块与压电阀驱动电路模块进行详细的硬件设计,电路都是针对检测或驱动对象的特性展开设计的,通过理论分析与电路测试证明两大模块的电路设计方案可行性较好。
关键词 阀门定位器 电路设计 压电阀驱动电路 阀位检测电路
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火车车辆位置确定系统的设计与实现 被引量:1
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作者 李长安 《神华科技》 2012年第2期83-86,共4页
针对现有技术中必须由人工确认定位车落臂位置的问题,本文设计了一种车辆位置确定系统,可以替代人工定位实现车辆位置的自动识别,进而实现定位车自动定位落臂位置。本系统不仅可以节省人力提高作业效率,而且可以完全实现定位车的自动化... 针对现有技术中必须由人工确认定位车落臂位置的问题,本文设计了一种车辆位置确定系统,可以替代人工定位实现车辆位置的自动识别,进而实现定位车自动定位落臂位置。本系统不仅可以节省人力提高作业效率,而且可以完全实现定位车的自动化作业。 展开更多
关键词 定位车PLC光检测单元
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A real-time detection and positioning method for small and weak targets using a 1D morphology-based approach in 2D images 被引量:8
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作者 Min-Song Wei Fei Xing Zheng You 《Light(Science & Applications)》 SCIE EI CAS CSCD 2018年第1期1063-1071,共9页
A small and weak target detection method is proposed in this work that outperforms all other methods in terms of real-time capability.It is the first time that two-dimensional(2D)images are processed using only one-di... A small and weak target detection method is proposed in this work that outperforms all other methods in terms of real-time capability.It is the first time that two-dimensional(2D)images are processed using only one-dimensional1D structuring elements in a morphology-based approach,enabling the real-time hardware implementation of the whole image processing method.A parallel image readout and processing structure is introduced to achieve an ultra-low latency time on the order of nanoseconds,and a hyper-frame resolution in the time domain can be achieved by combining the row-by-row structure and the electrical rolling shutter technique.Experimental results suggest that the expected target can be successfully detected under various interferences with an accuracy of 0.1 pixels(1σ)under the worst sky night test condition and that a centroiding precision of better than 0.03 pixels(1σ)can be reached for static tests.The real-time detection method with high robustness and accuracy is attractive for application to all types of real-time small target detection systems,such as medical imaging,infrared surveillance,and target measurement and tracking,where an ultra-high processing speed is required. 展开更多
关键词 high robustness and accuracy 1D morphology-based approach row-by-row structure real-time detection method small and weak target detection and positioning
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超声波技术在电力系统故障诊断中的应用 被引量:4
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作者 王松江 《油气田地面工程》 2020年第8期66-69,共4页
针对预防性试验不能发现电力设备集中缺陷问题,如电容器内部串并联部分小电容断线、瓷质开裂、绝缘部分受潮、绝缘内气泡、电缆故障点及路径查找,提出了应用超声波定位技术解决故障探测问题。超声波能形成很窄的波束,即具有指向性,利用... 针对预防性试验不能发现电力设备集中缺陷问题,如电容器内部串并联部分小电容断线、瓷质开裂、绝缘部分受潮、绝缘内气泡、电缆故障点及路径查找,提出了应用超声波定位技术解决故障探测问题。超声波能形成很窄的波束,即具有指向性,利用高频率超声波这一特性可以有效检测设备故障点。现场应用表明,该技术在发现均压电容器断线、电缆故障查找和电力设备绝缘诊断等方面效果显著,为进一步提高超声波技术在电力系统中的应用能力,提出了超声波局部放电检测及定位技术在开关柜中的应用研究方向。 展开更多
关键词 电力设备 故障探测 超声波 定位技术 超声波定位仪
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基于智能阀门定位器的自动检测系统
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作者 赵俊奎 马乾 张宇 《自动化与仪器仪表》 2014年第1期72-73,共2页
介绍一种针对智能阀门定位器的自动检测系统,并对自动检测系统总体设计、系统硬件说明、软件设计、打印结果进行介绍。
关键词 智能阀门定位器 自动检测
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SIPART PS2智能阀门定位器 被引量:2
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作者 李学秋 《华东纸业》 2010年第2期29-32,共4页
该文对智能型定位器的工作原理与系统结构作详细的分析,并对参数组态合初始化功能做一个简单的介绍。
关键词 智能型定位器 压电阀 行程检测 初始化
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