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Dynamic Pitch Misalignment Angle Measurement System for Precision Centrifuges

Laser and Optoelectronics Progress 2025年第9期62卷

作者： Liu, Xin Wang, Shanshan Zhang, Peihan He, Dong Hao, Leilei Qi, Yuxiang Hao, Qun School of Optics and Photonics Beijing Institute of Technology Beijing100081 China National Key Laboratory on Near-Surface Detection Beijing100072 China Laboratory of Science and Technology on Ultra-Precision Aerospace Control Instrument Beijing100039 China Beijing Institute of Aerospace Control Devices Beijing100039 China China Aerospace Academy of Electronics Technology Beijing100094 China School of Opto-Electronic Engineering Changchun University of Science and Technology Jilin Changchun130022 China

The measurement system was designed that utilizes the principle of photoelectric autocollimation to detect the dynamic pitch misalignment angle of a precision centrifuge. The system allows for real-time measurement of pitch angle variations at the end of the centrifuge arm, situated outside the centrifuge chamber. An external trigger module determines when the centrifuge reaches the measurement position and generates a trigger signal to initiate the measurement process. Experimental analyses were conducted to evaluate the signal-to-noise ratio of the detector under varying exposure levels, and an automatic dimming module was implemented to mitigate inconsistencies in image gray levels at different centrifuge speeds. Simulation experiments were conducted to analyze measurement errors in the optical path and the effects of environmental temperature fluctuations. Finally, on-site measurements of the dynamic pitch angle were performed at the centrifuge facility, achieving a measurement repeatability of 0. 207″. © 2025 Universitat zu Koln. All rights reserved.

关键词： Centrifuges

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Priority Based Adaptive MAC Protocol for UAV Ad Hoc Networks

Priority Based Adaptive MAC Protocol for UAV Ad Hoc Networks

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International Conference on Computer and Communications (ICCC)

作者： Xinglin Mou Hao Li Feng Yan Kai Ding Tao Wu Weiwei Xia Lianfeng Shen National Mobile Communications Research Laboratory Southeast University Nanjing China Science and Technology on Near-Surface Detection Laboratory Wuxi China Jiangsu ZhongLi Electronic Information Sci-Tech Co. Ltd Changshu China

ISBN: (纸本)9781665409513

In this paper, a priority based adaptive MAC protocol (PM-MAC) is proposed for UAV ad hoc networks. Firstly, in the protocol, the arriving packets are classified into different queues according to the priority of services. A Markov chain model is proposed to analyze the channel access probabilities of different queues. And it is ensured that packets with high priority can access the channel with high probability. Secondly, the size of contention window is adaptively adjusted based on backoff times and the current packet size. Finally, simulation results show that PM-MAC can guarantee the access requirements of high priority packets, and compared with the traditional backoff method, the backoff mechanism in PM-MAC achieves better performance in access success rate, channel utilization and backoff delay.

关键词： Adaptation models Analytical models Protocols Adaptive systems Simulation Markov processes Media Access Protocol

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Generative Adversarial Networks for Exo-atmospheric Infrared Objects Discrimination

Generative Adversarial Networks for Exo-atmospheric Infrared...

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2019 IEEE International Conference on Signal, Information and Data Processing, ICSIDP 2019

作者： Wu, Dongya Lu, Huanzhang Tao, Huamin Zhao, Bendong Zhao, Ming National University of Defense Technology Department of Electronic Science Changsha China Science and Technology on Near-Surface Detection Laboratory Wuxi China

ISBN: (纸本)9781728123455

External atmospheric infrared (IR) target recognition is an important research topic of space surveillance systems. The different micromotion states of the target result in respective features in the obtained sequence of IR radiation intensities, and such differences are difficult to visually describe and difficult to extract efficiently. Due to the difficulty of spatial experiments, the target sample data is very limited. In the case of limited labeled samples, there are few methods that can effectively classify time series effectively, resulting in low classification accuracy and difficulty in meeting practical application requirements. We use generative adversarial networks(GAN) for semi-supervised learning, combining neural network classifiers with adversarial generation models for the classification of infrared grayscale time series of spatial targets. The effective classification of the target is achieved with a small number of labeled target samples. The experiment proves the effectiveness of the method and the classification effect is better than other methods. © 2019 IEEE.

关键词： Generative adversarial networks

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Design and implementation of real-time localization system (RTLS) based on UWB and TDoA algorithm

arXiv

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arXiv 2021年

作者： Zhang, Fengyun Yang, Li Liu, Yuhuan Ding, Yulong Yang, Shuang-Hua Li, Hao Department of Computer Science and Engineering Southern University of Science and Technology Shenzhen China Army Engineering University of PLA Nanjing China Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology Shenzhen China PCL Research Center of Networks and Communications Peng Cheng Laboratory Shenzhen China Science and Technology on Near-surface Detection Laboratory Wuxi China

Nowadays, accurate localization plays an essential role in many fields, like target tracking and path planning. The challenges of indoor localization include inadequate localization accuracy, unreasonable anchor deployment in complex scenarios, lack of stability, and the high cost. So the universal positioning technologies cannot meet the real application requirements scarcely. To overcome these shortcomings, a comprehensive Ultra Wide-Band (UWB) based RTLS is presented in this paper. We first introduce the architecture of real-time localization system, then propose a new wireless clock synchronization (WCS) scheme, finally discuss the time difference of arrival (TDoA) algorithm. We define the time-base selection strategy for TDoA algorithm, and analyze the relationship between anchor deployment and positioning accuracy. The Extended Kalman Filter (EKF) method is presented for non-linear dynamic localization estimation, and it performs well in terms of stability and accuracy in moving target. Copyright © 2021, The Authors. All rights reserved.

关键词： Extended Kalman filters

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A Practical Control Strategy for Magnetic Levitation System against Two Probes Failures

A Practical Control Strategy for Magnetic Levitation System ...

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Chinese Control Conference (CCC)

作者： Jinhui Li Kai Ding Jianmei Sun Chi Wang Hongtao Zhao Huijie Zhu Science and Technology on Near-Surface Detection Laboratory Wuxi China Department of Precision Mechanical Engineering Shanghai University Shanghai China

ISBN: (数字)9789881563903

ISBN: (纸本)9781728165233

This paper addresses the active control for magnetic levitation system against two probes failures, which degrades the stability of the levitation control, decreases the ride comfort near the rail joint. Firstly, a minimum interaction model containing vertical dynamics of electromagnets, cabin and traditional control scheme is developed. The output characteristics of probes near or under the typical joint are obtained by fitting experimental data. It shows that the maximum of the deviation values is up to 11mm, which should be attenuated effectively. Inspired by the probes' output characteristics and limited response range in the process of crossing the joint, a practical joint recognition method is explored. It shows that the joint can be identified timely. Then a pair of complementary filters acting on acceleration and limited gap signal is developed to reconstruct the levitation gap signals. It shows that the deviations of the synthesized value are reduced substantially. After building the overall dynamic model with details, numerical simulations are carried out, and the results illustrating the improvement of stability and extended low speed range are provided.

关键词： Probes Levitation Electromagnets Rails Fluctuations Electromagnetic forces

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MEMS Accelerometer Stability and Temperature Compensation for Long Term Structure Surveillance System

MEMS Accelerometer Stability and Temperature Compensation fo...

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IEEE International Conference on Robotics and Biomimetics

作者： Yingjiao Rong Zengshuai Qiu Guang Luo Congcong Ma Guangyi Shi Juanhui Zheng The Science and Technology on Near-Surface Detection Laboratory Wuxi China DFH Satellite Co. Ltd. Beijing China Peking University Beijing China BEWIS Sensing Technology LCC Wuxi China School of Software and Microelectronics Peking University Beijing China

ISBN: (纸本)9781665405362

This paper describes the compensation strategy for MEMS accelerometer which needs long time stability and good temperature drift parameter for long time surveillance system. A noise filter for static monitoring environment is designed. The static stability algorithm is designed by studying railway monitoring data. Temperature compensate system is designed, temperature compensation model fitted with a polynomial equation is proposed. Experimental result shows the difference between the heating curve and the cooling curve, a method for judging the heating and cooling according to the readings of the temperature sensor is proposed. Accelerometer array with redundant structure is designed and temperature compensation model is designed to compensate the heating and cooling separately. Through experiments, the errors of the new method and the traditional method are compared. The temperature drift can be compensated less then 80 μg.

关键词： Temperature sensors Accelerometers Heating systems Micromechanical devices Wavelet transforms Cooling Surveillance

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Towards Automatic Operation Motion Tracking Algorithm Based on Inertial Sensors for Multi Joints Machinery

Towards Automatic Operation Motion Tracking Algorithm Based ...

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IEEE International Conference on Robotics and Biomimetics

作者： Yingjiao Rong Zengshuai Qiu Jiayi Liu Zhan Shu Chen Jiao Guangyi Shi Qiang Qin The Science and Technology on Near-Surface Detection Laboratory Wuxi China DFH Satellite Co. Ltd. Beijing China Peking University Beijing China BEWIS Sensing Technology LCC Wuxi China School of Software and Microelectronics Peking University Beijing China

ISBN: (纸本)9781665405362

This paper presents a novel method for multi joints machinery motion tracking, which is useful for automatic operation. Heavy machinery such as excavator bulldozer forklift and grader are with multiple arms for particular tasks. These arms with rotation motion will change the dimensional coordinates accordingly. Thus, the motion tracking will give the feedback for automatic control and realize the unmanned operation in the end. Inertial measurement units (IMUs) are designed with 6D MEMS sensors. Calibration method is studied and the installation error is corrected. Extend Kalman filter is designed for dynamic motion tracking. The acceleration chip structure is also studied for later on ASIC design. Experimental result shows that the dynamic angle error is better than 0.1 degree for every joint of a robot arm, which proves the dynamic tracking method.

关键词： Tracking Robot kinematics Heuristic algorithms Dynamics Arms Robot sensing systems Calibration

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Location of Buried Target with Method of Auxiliary Sources 4

Location of Buried Target with Method of Auxiliary Sources

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4th IEEE Advanced Information technology, Electronic and Automation Control Conference, IAEAC 2019

作者： Liang, Shan Zhang, Shuang Chen, Shudong Liu, Zhaohe Jilin University College of Electronic Science and Engineering Changchun130012 China Science and Technology on Near-Surface Detection Laboratory Wuxi214035 China

ISBN: (纸本)9781728119076

It is a key problem to locate a buried target in UXO detection. The inversion algorithm based on the principle of least squares requires a large number of forward calculations to estimate the position of a target. The method of auxiliary sources (MAS) which can directly locate a UXO-like target is presented here without forward calculation. With a brief description of single dipole model for a UXO-like target, the basis of target location with magnetic field and scalar magnetic potential is deduced theoretically. Auxiliary sources made of elementary magnetic dipoles on a plane are applied to estimate the equivalent scalar magnetic potential from the measured magnetic field. Firstly, the moment of elementary magnetic dipoles is estimated by matching the measured magnetic field with the auxiliary sources modeled field. Then, the equivalent scalar magnetic potential is calculated with these elementary magnetic dipoles without a priori knowledge of the target's location. Finally, the position is calculated directly with the measured magnetic field and the equivalent scalar magnetic potential. The responses of four UXOs excited by a z-component square transmitting coil are recorded by a 9×9 3-component receiving coil array. With the auxiliary sources on a plane under the measurement grid, the equivalent scalar magnetic potential is calculated precisely. Experimental results show that the measured magnetic field matches well with the auxiliary sources modeled field, and the estimated positions of all targets are highly consistent with the measured ones. The horizontal error is within 2 cm, and the depth error is within 6 cm. © 2019 IEEE.

关键词： Magnetic fields

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Observation of e+e-→■-+c.c.

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Chinese Physics C 2023年第4期 22-31页

作者：麦迪娜 M.N.Achasov P.Adlarson M.Albrecht R.Aliberti A.Amoroso 安美儒安琪白旭红白羽 O.Bakina R.Baldini Ferroli I.Balossino 班勇 V.Batozskaya D.Becker K.Begzsuren N.Berger M.Bertani D.Bettoni F.Bianchi J.Bloms A.Bortone I.Boyko R.A.Briere A.Brueggemann 蔡浩蔡啸 A.Calcaterra 曹国富曹宁 S.A.Cetin 常劲帆常万玲 G.Chelkov 陈琛陈超陈刚陈和生陈玛丽陈申见陈少敏 T.Chen 陈旭荣 X.T.Chen 陈元柏陈卓俊成伟帅初晓 G.Cibinetto F.Cossio 崔佳佳代洪亮代建平 A.Dbeyssi R.E.de Boer D.Dedovich 邓子艳 A.Denig I.Denysenko M.Destefanis F.De Mori 丁勇董静董燎原董明义董翔杜书先 P.Egorov 范玉兰方建房双世方文兴方易 R.Farinelli L.Fava F.Feldbauer G.Felici 封常青冯俊华 K Fischer M.Fritsch C.Fritzsch 傅成栋高涵高原宁高扬 S.Garbolino I.Garzia 葛潘婷葛振武耿聪 E.M.Gersabeck A Gilman K.Goetzen 龚丽龚文煊 W.Gradl M.Greco 谷立民顾旻皓顾运厅关春懿郭爱强郭立波郭如盼郭玉萍 A.Guskov 韩婷婷韩文颖郝喜庆 F.A.Harris 何凯凯何康林 F.H.Heinsius C.H.Heinz 衡月昆 C.Herold M.Himmelreich 侯国一侯颖锐侯治龙胡海明 J.F.Hu 胡涛胡誉黄光顺黄凯旋黄麟钦黄麟钦黄性涛黄燕萍黄震 T.Hussain N Hüsken W.Imoehl M.Irshad J.Jackson S.Jaeger S.Janchiv 纪全姬清平季晓斌季筱璐吉钰瑶贾泽坤姜侯兵姜赛赛江晓山 Y.Jiang 焦健斌焦铮金山金毅荆茂强 T.Johansson N.Kalantar-Nayestanaki 康晓珅 R.Kappert 柯百谦 I.K.Keshk A.Khoukaz P.Kiese R.Kiuchi R.Kliemt L.Koch O.B.Kolcu B.Kopf M.Kuemmel M.Kuessner A.Kupsc W.Kühn J.J.Lane J.S.Lange P.Larin A.Lavania L.Lavezzi 雷祚弘 H.Leithoff M.Lellmann T.Lenz 李翠李聪李春花李澄李德民李飞李刚李慧李贺李海波李惠静 H.N.Li J.Q.Li 李静舒李井文李科 L.J.Li 李龙科李蕾李明浩李培荣李素娴栗帅迎李腾李卫东李卫国李旭红李晓玲李晓宇梁昊梁浩梁浩梁勇飞梁羽铁廖广睿廖龙洲 J.Libby A.Limphirat 林创新林德旭 T.Lin 刘北江刘春秀 D.Liu 刘福虎刘芳刘峰 G.M.Liu H.Liu 刘宏邦刘怀民刘欢欢刘汇慧刘建北刘佳俊刘晶译刘凯刘魁勇刘珂刘亮刘露刘美宏刘佩莲刘倩刘树彬刘桐刘维克刘卫民刘翔刘英刘玉斌刘振安刘智青娄辛丑卢飞翔吕海江吕军光陆小玲卢宇卢云鹏 Z.H.Lu 罗成林罗民兴罗涛罗小兰吕晓睿吕翌丰马凤才马海龙马连良马明明马秋梅马润秋马瑞廷马骁妍马尧 F.E.Maas M.Maggiora S.Maldaner S.Malde Q.A.Malik A.Mangoni 冒亚军毛泽普 S.Marcello 孟召霞 J.G.Messchendorp G.Mezzadri H.Miao 闵天觉 R.E.Mitchell 莫晓虎 N.Yu.Muchnoi Y.Nefedov F.Nerling I.B.Nikolaev 宁哲 S.Nisar 牛艳 S.L.Olsen 欧阳群 S.Pacetti 潘祥潘越 A.Pathak M.Pelizaeus 彭海平 K.Peters 平加伦平荣刚 S.Plura S.Pogodin V.Prasad 齐法制齐航漆红荣祁鸣齐天钰钱森钱文斌钱圳乔从丰秦佳佳秦丽清覃潇平秦小帅秦中华邱进发屈三强 K.H.Rashid C.F.Redmer 任旷洁 A.Rivetti V.Rodin M.Rolo 荣刚 Ch.Rosn Institute of High Energy Physics G.I. Budker Institute of Nuclear Physics SB RAS(BINP) Novosibirsk State University Uppsala University Bochum Ruhr-University Johannes Gutenberg University of Mainz University of Turin INFN Liaoning Normal University State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China University of Jinan Southeast University Joint Institute for Nuclear Research INFN Laboratori Nazionali di Frascati INFN Sezione di Ferrara Peking University State Key Laboratory of Nuclear Physics and Technology Peking University National Centre for Nuclear Research Institute of Physics and Technology University of Muenster Carnegie Mellon University Wuhan University University of Chinese Academy of Sciences Istinye University Moscow Institute of Physics and Technology Nankai University Soochow University Nanjing University Tsinghua University Institute of Modern Physics Hunan University School of Physics and Electronics Hunan University Shandong University Yunnan University Helmholtz Institute Mainz Liaoning University Zhengzhou University University of Eastern Piedmont Sun Yat-Sen University University of Oxford University of Ferrara University of Manchester GSI Helmholtzcentre for Heavy Ion Research GmbH Guangxi University Nanjing Normal University Shandong Normal University Fudan University Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics Fudan University Henan Normal University University of Hawaii Suranaree University of Technology Goethe University Frankfurt South China Normal University Guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum Matter South China Normal University University of South China University of the Punjab Indiana University Huangshan College University of Groningen Justus-Liebig-Universitaet Giessen Ⅱ. Physikalisches Institut Indian Institute of Technology Madras Qufu Normal University Shanxi Normal University Beijing Institute of Petrochemical Technology Lanzhou Univ

Using data taken at 29 center-of-mass energies between 4.16 and 4.70 GeV with the BESⅢ detector at the Beijing Electron Positron Collider corresponding to a total integrated luminosity of approximately 18.8 fb-1, the process e+e-→■+ c.c. is observed for the first time with a statistical significance of 11.5σ. The average Born cross sections in the energy ranges of（4.160, 4.380） GeV,（4.400, 4.600） GeV and（4.610, 4.700） GeV are measured to be（21.5±5.7±1.2） fb,（46.3±10.6±2.5） fb and （59.0±9.4±3.2） fb, respectively, where the first uncertainties are statistical and the second are systematic. The line shapes of the ■ and ppπ-invariant mass spectra are consistent with phase space distributions, indicating that no hexaquark or di-baryon state is observed.

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Bucking coil used in unexploded ordnance detection with transient electromagnetic system 4

Bucking coil used in unexploded ordnance detection with tran...

引用

4th IEEE Advanced Information technology, Electronic and Automation Control Conference, IAEAC 2019

作者： Jiang, Hejun Luan, Xinqun Hao, Jun Zhang, Shuang Chen, Shudong Science and Technology on Near-Surface Detection Laboratory Wuxi214035 China Jilin University College of Electronic Science and Engineering Changchun130012 China

ISBN: (纸本)9781728119076

Off-time response is usually measured by transient electromagnetic (TEM) system to detect subsurface targets. Compared with off-time response, on-time response of TEM system is more sensitive to high-conductivity targets, such as UXOs. However, it is difficult to obtain on-time response directly due to the strong primary field response. The key problem for on-time measurement is to eliminate the primary field response. Bucking coil is adopted here to compensation the primary field of transmitter coil at receiving coil for on-time response measuring. Firstly, the structure of the sensor with transmitting coil, bucking coil, and receiving coil is presented. Then, the primary field of transmitting coil and bucking coil at the position of receiving coil is calculated theoretically. With the side length of transmitting coil, bucking coil and the receiving coil fixed, the number of turns for transmitting coil and bucking coil are optimized for the best compensation. Calculated results show that the best compensation effect can reach 0.53%. Finally, the sensor with a transmitting coil (constructed with a side length and number of turns of 96 cm and 30, respectively), a bucking coil (constructed with a side length and number of turns of 26 cm and 8, respectively), and a receiving coil (constructed with a side length of 6 cm) was built. Measured results show that the primary field response after compensation is no more than 1% of the original response, and the maximum amplitude is only 0.4V. The on-time response of targets can be accurately recorded. © 2019 IEEE.

关键词： Transient analysis

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