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Fused-like angles: replacement for roll-pitch-yaw angles for a six-degree-of-freedom grating interferometer Research Article

Di Chang, Pengcheng Hu, Jiubin Tan,di.chang@hit.edu.cn,hupc@hit.edu.cn,jbtan@hit.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 12,   Pages 1551-1684 doi: 10.1631/FITEE.2000432

Abstract: is important in a six-degree-of-freedom but only a few studies have focused on this topic. Roll-pitch-yaw angles, widely used in aviation, navigation, and robotics, are now being brought to the field of multi-degree-of-freedom interferometric measurement. However, the roll-pitch-yaw angles are not the exact definitions the metrologists expected in interferometry, because they require a certain sequential order of rotations and may cause errors in describing complicated rotations. The errors increase as the tip and tilt angles of the grating increase. Therefore, a replacement based on fused angles in robotics is proposed and named “.” The are error-free, so they are more in line with the definitions in grating interferometry and more suitable for s. have already been used in research on the kinematic model and decoupling algorithm of the six-degree-of-freedom .

Keywords： 无偏溯源角；光栅干涉仪；六自由度测量；角度表达方法    

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Displacement measuring grating interferometer: a review Special Feature on Precision Measurement and Inst

Peng-cheng HU, Di CHANG, Jiu-bin TAN, Rui-tao YANG, Hong-xing YANG, Hai-jin FU

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 5,   Pages 631-654 doi: 10.1631/FITEE.1800708

Abstract:

A grating interferometer, called the “optical encoder,” is a commonly used tool for precise displacement measurements. In contrast to a laser interferometer, a grating interferometer is insensitive to the air refractive index and can be easily applied to multi-degree-of-freedom measurements, which has made it an extensively researched and widely used device. Classified based on the measuring principle and optical configuration, a grating interferometer experiences three distinct stages of development: homodyne, heterodyne, and spatially separated heterodyne. Compared with the former two, the spatially separated heterodyne grating interferometer could achieve a better resolution with a feature of eliminating periodic nonlinear errors. Meanwhile, numerous structures of grating interferometers with a high optical fold factor, a large measurement range, good usability, and multidegree-of-freedom measurements have been investigated. The development of incremental displacement measuring grating interferometers achieved in recent years is summarized in detail, and studies on error analysis of a grating interferometer are briefly introduced.

Keywords： Grating interferometer     Optical encoder     Displacement measurement     Precision measurement    

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Analysis of Characteristics and CMAC Neural Networks Controller of Electrohydraulic Servo System of the 6-DOF Paralle Platform

Zhai Chuanrun,ZhanXingqun,Zhang Yanhua,Ran Xianglai,Zhao Keding

Strategic Study of CAE 2001, Volume 3, Issue 10,   Pages 36-40

Abstract:

This paper analyzed the kinematics and dynamics of the 6-DOF platform, and adopted CMAC Neural Networks as controller to realize tailing track. Simulation results showed that the analysis of kinematics and dynamics was correct and the controller had the capabilities of resisting disturbance and good robustness.

Keywords： 6-DOF in-parallel platform     CMAC neural network     kinematics     kinetics    

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A general method of designing phase-shifting algorithms for grating lateral shearing interferometry None

Chao FANG, Yang XIANG, Ke-qi QI

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 6,   Pages 809-814 doi: 10.1631/FITEE.1601692

Abstract: We propose a general method of designing phase-shifting algorithms for grating lateral shearing interferometry. The algorithms compensate for the zeroth-order effect error and phase-shifting error in varying degrees. We derive a general expression of the phase-shifting algorithm in grating lateral shearing interferometer and introduce the corresponding design method. Based on the expression and method, four phase-shifting algorithms are designed with different phase-shifting errors to obtain high measurement accuracy. A new 13-frame phase-shifting algorithm is designed and simulated with a large zeroth-order effect. Simulation results verify the general expression and the corresponding design method.

Keywords： Interferometry     Phase measurement     Phase-shifting algorithms    

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Study on the Method About Type Synthesis of the One-dof Planar Closed Chain’s Mechanisms

Zhang Meilin,Zhang Ye,Yang Zhiyi

Strategic Study of CAE 2002, Volume 4, Issue 6,   Pages 5-8

Abstract:

This paper puts forward a kind of method about type synthesis of the one-dof planar closed chain's mechanisms, that is , “type synthesis by planar graph”.

The program of the method is that components of the chain are set up by the mechanical function first of all, then the planar graph is configured by the chain, finally the type synthesis and inversion of mechanisms are made by the graph, and the optimum structural kinematic scheme is formed.

Keywords： mechanisms     kinematic chain     planar graph    

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Dual-Comb Ranging Review

Zebin Zhu, Guanhao Wu

Engineering 2018, Volume 4, Issue 6,   Pages 772-778 doi: 10.1016/j.eng.2018.10.002

Abstract:

Absolute distance measurement is a fundamental technique in mobile and large-scale dimensional metrology. Dual-comb ranging is emerging as a powerful tool that exploits phase resolution and frequency accuracy for high-precision and fast-rate distance measurement. Using two coherent frequency combs, dual-comb ranging allows time and phase response to be measured rapidly. It breaks through the limitations related to the responsive bandwidth, ambiguity range, and dynamic measurement characteristics of conventional ranging tools. This review introduces dual-comb ranging and summarizes the key techniques for realizing this ranging tool. As optical frequency comb technology progresses, dualcomb ranging shows promise for various professional applications.

Keywords： Ranging     Dual-comb interferometer     Phase noise     Timing jitter     Tight-locking     Post-correction    

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Study on the six dimension management method of producing technical documentation for warship maintenance

Chen Zhimin and Yang Bin

Strategic Study of CAE 2015, Volume 17, Issue 5,   Pages 83-89

Abstract:

The six dimension management method considering the characteristics of ship depot maintenance technical documentation is presented in this paper. The existing maintenance technical documentation situations are examined. Considering the characteristics huge contents， many company participate， big difficulty for quality and progress manage of write documentation. To solve these issues， a six dimension management method of request， kind example， maintain analysis， the knowledge base， quality management， progress

Keywords： ship；maintenance technical documentation；six dimension management method；maintain analysis    

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Model-free adaptive control for three-degree-of-freedom hybrid magnetic bearings Article

Ye YUAN, Yu-kun SUN, Qian-wen XIANG, Yong-hong HUANG, Zhi-ying ZHU

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 12,   Pages 2035-2045 doi: 10.1631/FITEE.1700324

Abstract: Mathematical models are disappointing due to uneven distribution of the air gap magnetic field and significant unmodeled dynamics in magnetic bearing systems. The effectiveness of control deteriorates based on an inaccurate mathematical model, creating slow response speed and high jitter. To solve these problems, a model-free adaptive control (MFAC) scheme is proposed for a three-degree-of-freedom hybrid magnetic bearing (3-DoF HMB) control system. The scheme for 3-DoF HMB depends only on the control current and the objective balanced position, and it does not involve any model information. The design process of a parameter estimation algorithm is model-free, based directly on pseudo-partial-derivative (PPD) derived online from the input and output data information. The rotor start-of-suspension position of the HMB is regulated by auxiliary bearings with different inner diameters, and two kinds of operation situations (linear and nonlinear areas) are present to analyze the validity of MFAC in detail. Both simulations and experiments demonstrate that the proposed MFAC scheme handles the 3-DoF HMB control system with start-of-suspension response speed, smaller steady state error, and higher stability.

Keywords： Model-free adaptive control     Hybrid magnetic bearings     Nonlinear areas     Faster response     Higher stability    

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Rapid thermal sensors with high resolution based on an adaptive dual-comb system Special Feature on Precision Measurement and Inst

Yi-zheng GUO, Ming YAN, Qiang HAO, Kang-wen YANG, Xu-ling SHEN, He-ping ZENG

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 5,   Pages 674-684 doi: 10.1631/FITEE.1800347

Abstract:

We report a high-resolution rapid thermal sensing based on adaptive dual comb spectroscopy interrogated with a phase-shifted fiber Bragg grating (PFBG). In comparison with traditional dual-comb systems, adaptive dual-comb spectroscopy is extremely simplified by removing the requirement of strict phase-locking feedback loops from the dual-comb configuration. Instead, two free-running fiber lasers are adopted as the light sources. Because of good compensation of fast instabilities with adaptive techniques, the optical response of the PFBG is precisely characterized through a fast Fourier transform of the interferograms in the time domain. Single-shot acquisition can be accomplished rapidly within tens of milliseconds at a spectral resolution of 0.1 pm, corresponding to a thermal measurement resolution of 0.01 °C. The optical spectral bandwidth of the measurement also exceeds 14 nm, which indicates a large dynamic temperature range. It shows great potential for thermal sensing in practical outdoor applications with a loose self-control scheme in the adaptive dual-comb system.

Keywords： Interferometers     Fiber sensors     Laser spectroscopy    

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A digital moiré fringe method for displacement sensors Article

Jian WU,Ting-ting ZHOU,Bo YUAN,Li-qiang WANG

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 9,   Pages 946-953 doi: 10.1631/FITEE.1500270

Abstract: In this study, a displacement measurement method based on digital moiré fringe is described and experimentally demonstrated. The method is formed by only one grating with a constant pitch. First, the magnified grating image is received by an imaging array and is sent to a computer. Then, the digital moiré fringes are generated by overlaying the grating image with its mirrored one. Finally, a specifically designed algorithm is used to obtain the fringes’ phase difference before and after movement and calculate the displacement. This method has the effects of amplifying displacement and averaging the grating lines error, the same as the traditional moiré technique using two pieces of gratings. At the same time, the proposed system is much easier to assemble and the measurement resolution can be set more flexibly. One displacement measuring system based on this method was built up. Experiment results show that its measurement errors are less than 0.3 μm and less than 0.12 μm at the resolutions of 0.1 μm and 0.03 μm, respectively.

Keywords： Digital moiré     fringe     Displacement measurement     Grating    

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Accurate two-degree-of-freedom discrete-time current controller design for PMSM using complex vectors None

Meng WANG, Jia-qiang YANG, Xiang ZHANG, Chang-sheng ZHU

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 4,   Pages 569-581 doi: 10.1631/FITEE.1601390

Abstract: Properties of the current controller are essential for permanent magnet synchronous machine (PMSM) drives, but the conventional continuous-time current controller cannot fully decouple the cross-coupling terms when applied in the digital processor. Its performance is related closely to the rotational speed. To improve the performance of the current loop, the direct design method in the discrete-time domain is adopted using the accurate discrete-time complex vector model. An integrated accurate hold-equivalent discrete model for PMSM is derived considering the difference between the output of the voltage source inverter and the back electro-motive force. Then an accurate two-degree-of-freedom (2DOF) current controller with a third-order closed-loop transfer function is designed. The 2DOF controller has more freedom in pole placement, and two schemes with a different cancelled pole-zero pair are investigated. Analysis is conducted by the robust root locus method via the complex vector root locus and sensitivity functions, showing properties in disturbance rejection and sensitivity to parameter variation of two schemes. Both schemes have their own advantages. Finally, the dynamic performance and flexibility of the proposed current controller is verified on a 2.5-kW PMSM test bench.

Keywords： Permanent magnet synchronous machine (PMSM)     Discrete-time current controller     Complex vector    

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Antenna design and analysis of Fengyun-3 microwave humidity sounder

Wang Hongjian,Li Jing,Liu Heguang,Zhang Shengwei

Strategic Study of CAE 2009, Volume 11, Issue 4,   Pages 39-45

Abstract:

Fengyun-3(FY-3) microwave humidity sounder antenna has the following specialties: high gain, low noise, high beam efficiency and high frequency. This Antenna has great influence on the precision of the whole system of FY-3MHS (microwave humidity sounder), offset parabolic antennae with conical corrugated horns are selected for these antennae. The frequencies of the antenna are 150 GHz and 183 GHz respectively (up to the highest frequency of the payload for the domestic satellite ), in addition, dual linear polarizations are also needed for the 150 GHz channels. Great challenges are brought about with the stringent demand for the FY-3MHS antenna. The analysis and design of this antenna need intercross knowledge of the electromagnetic theory, mechanics, manufacturing, measurements, quasi-optics, thermal and orbit etc. The successful design and assembly of FY-3MHS antennae fill up the gap of remote sensing in our country and stride a greatly leap in antenna theory.

Keywords： FY-3MHS     offset parabolic antenna     corrugated horn     remote sensing    

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Error analysis and compensation of compound measuring system for blade surface

Li Bing,Chen Lei,Ding Jianjun,Jiang Zhuangde

Strategic Study of CAE 2013, Volume 15, Issue 1,   Pages 39-44

Abstract:

The high-accuracy measurement of complex airfoil surfaces is a critical issue in the inspection of blades. Aiming at this problem, a compound measuring principle is proposed in this paper. Using the principle, the airfoil surface and root datum of a blade are measured based on contact inductance method and non-contact laser triangular method, respectively. And a four-coordinate measuring system is designed and established. Then, on the basis of the mechanical structure of the measuring system, the geometric error of which is analyzed syste-matically. And a corresponding extraction and compensation method is proposed based on the laser interferometry. The experimental results show that the proposed error analysis and compensation methods can improve the accuracy of the four-coordinate measuring system effectively.

Keywords： blade airfoil surface     compound measuring principle     error analysis     error compensation     laser interferometry    

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Improved binary similarity measures for software modularization Article

Rashid NASEEM, Mustafa BinMat DERIS, Onaiza MAQBOOL, Jing-peng LI, Sara SHAHZAD, Habib SHAH

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 8,   Pages 1082-1107 doi: 10.1631/FITEE.1500373

Abstract: Various binary similarity measures have been employed in clustering approaches to make homogeneous groups of similar entities in the data. These similarity measures are mostly based only on the presence or absence of features. Binary similarity measures have also been explored with different clustering approaches (e.g., agglomerative hierarchical clustering) for software modularization to make software systems understandable and manageable. Each similarity measure has its own strengths and weaknesses which improve and deteriorate the clustering results, respectively. We highlight the strengths of some well-known existing binary similarity measures for software modularization. Furthermore, based on these existing similarity measures, we introduce several improved new binary similarity measures. Proofs of the correctness with illustration and a series of experiments are presented to evaluate the effectiveness of our new binary similarity measures.

Keywords： Binary similarity measure     Binary features     Combination of measures     Software modularization    

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A method for Absolute Protein Expression Quantity Measurement Employing Insulator RiboJ Article

Hongbin Yu, Zheng Wang, Hanyue Xu, Jiusi Guo, Qingge Ma, Xiangxu Mu, Yunzi Luo

Engineering 2018, Volume 4, Issue 6,   Pages 881-887 doi: 10.1016/j.eng.2018.09.012

Abstract:

Measuring the absolute protein expression quantity for a specific promoter is necessary in the fields of both molecular biology and synthetic biology. The strength of a promoter is traditionally characterized by measuring the fluorescent intensity of the fluorescent protein downstream of the promoter. Until now, measurement of the absolute protein expression quantity for a promoter, however, has been unsuccessful in synthetic biology. The fact that the protein coding sequence influences the expression level for different proteins, and the inconvenience of measuring the absolute protein expression level, present a challenge to absolute quantitative measurement. Here, we introduce a new method that combines the insulator RiboJ with the standard fluorescence curve in order to measure the absolute protein expression quantity quickly; this method has been validated by modeling verification. Using this method, we successfully measured nine constitutive promoters in the Anderson promoter family. Our method provides data with higher accuracy for pathway design and is a straightforward way to standardize the strength of different promoters.

Keywords： RiboJ     Promoter measurement     Synthetic biology    

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Title Author Date Type Operation

Fused-like angles: replacement for roll-pitch-yaw angles for a six-degree-of-freedom grating interferometer

Di Chang, Pengcheng Hu, Jiubin Tan,di.chang@hit.edu.cn,hupc@hit.edu.cn,jbtan@hit.edu.cn

Journal Article

Displacement measuring grating interferometer: a review

Peng-cheng HU, Di CHANG, Jiu-bin TAN, Rui-tao YANG, Hong-xing YANG, Hai-jin FU

Journal Article

Analysis of Characteristics and CMAC Neural Networks Controller of Electrohydraulic Servo System of the 6-DOF Paralle Platform

Zhai Chuanrun,ZhanXingqun,Zhang Yanhua,Ran Xianglai,Zhao Keding

Journal Article

A general method of designing phase-shifting algorithms for grating lateral shearing interferometry

Chao FANG, Yang XIANG, Ke-qi QI

Journal Article

Study on the Method About Type Synthesis of the One-dof Planar Closed Chain’s Mechanisms

Zhang Meilin,Zhang Ye,Yang Zhiyi

Journal Article

Dual-Comb Ranging

Zebin Zhu, Guanhao Wu

Journal Article

Study on the six dimension management method of producing technical documentation for warship maintenance

Chen Zhimin and Yang Bin

Journal Article

Model-free adaptive control for three-degree-of-freedom hybrid magnetic bearings

Ye YUAN, Yu-kun SUN, Qian-wen XIANG, Yong-hong HUANG, Zhi-ying ZHU

Journal Article

Rapid thermal sensors with high resolution based on an adaptive dual-comb system

Yi-zheng GUO, Ming YAN, Qiang HAO, Kang-wen YANG, Xu-ling SHEN, He-ping ZENG

Journal Article

A digital moiré fringe method for displacement sensors

Jian WU,Ting-ting ZHOU,Bo YUAN,Li-qiang WANG

Journal Article

Accurate two-degree-of-freedom discrete-time current controller design for PMSM using complex vectors

Meng WANG, Jia-qiang YANG, Xiang ZHANG, Chang-sheng ZHU

Journal Article

Antenna design and analysis of Fengyun-3 microwave humidity sounder

Wang Hongjian,Li Jing,Liu Heguang,Zhang Shengwei

Journal Article

Error analysis and compensation of compound measuring system for blade surface

Li Bing,Chen Lei,Ding Jianjun,Jiang Zhuangde

Journal Article

Improved binary similarity measures for software modularization

Rashid NASEEM, Mustafa BinMat DERIS, Onaiza MAQBOOL, Jing-peng LI, Sara SHAHZAD, Habib SHAH

Journal Article

A method for Absolute Protein Expression Quantity Measurement Employing Insulator RiboJ

Hongbin Yu, Zheng Wang, Hanyue Xu, Jiusi Guo, Qingge Ma, Xiangxu Mu, Yunzi Luo

Journal Article