Acta Metrologica Sinica

Office Online

Manuscript Tracking

Editor-in-chief

Journal Online

Current Issue

Advanced Search

Archive

Read Articles

Download Articles

Traffic

Quick Search

2017 Vol. 38, No. 5 Published: 2017-09-22

	521	Measurement and Analysis System of Jet Flow Concentration Field Based on Chemiluminescence Solution as a Tracer
		DING Tao,ZHANG Rui-fen,SHI Ming-juan,HE Mo-wei,YING Cheng-xi,SONG Qing-qing
		DOI: 10.3969/j.issn.1000-1158.2017.05.01
		Based on the advantages of chemiluminescence of high sensitivity and being captured by camera without additional light source, a systematically studies for the feasibility of chemiluminescence solution as tracer of jet flow were carried out, and a novel laboratory test method of concentration field of jet flow to obtain integral information of instantaneous concentration field was explored.The main work contains optimization selection and calibration of chemiluminescence system, experimental facilities and analysis system for diffusion of concentration field of jet flow, and study of experiment of concentration field diffusion of jet flow.The feature of the system is the chemiluminescence solution as tracer of concentration field of jet flow, and the facility for image acquisition and image processing program for capturing and analyzing the diffusion process of concentration field of jet flow with space-time dynamic changes.The results indicate that the chemiluminescence system of peroxyoxalate can act as tracer of jet flow to quantitatively describe and analyze the diffusion property of concentration field of jet flow, and the independently designed and developed experimental facilities and analysis systems can measure and analyze the concentration field of jet flow flowing water.
		2017 Vol. 38 (5): 521-526 [Abstract] ( 495 ) HTML (1 KB) PDF (1443 KB) ( 467 )

	527	Development of Quantitative Reference Material of Enterobacter Cloacae
		CHEN Min-fan,FU Bo-qiang,LIN Jing,ZHANG Ling,SUI Zhi-wei,WANG Jing
		DOI: 10.3969/j.issn.1000-1158.2017.05.02
		A reference material in globular shape for the quantification of enterobacter cloacae was prepared by vacuum freeze drying and filter method. The viable count of enterobacter cloacae per sphere was measured in cfu value by filter membrane method. After optimizing the protective agent and freeze-drying process parameters, the average survival rate reached 51%. The reference material has uniform shape, smooth appearance and good reconstituability. The homogeneity and stability of the enterobacter cloacae reference material were determined by plate counting method on violet red bile agar (VRBA) culture media. The results showed that the reference material is homogeneous and stable for up to 6 months when stored at -80 ℃. The reference material was characterized by six laboratories with filter membrane method on Endo Agar. The value of the reference material is（2.0±0.1）log10 (cfu/vial), with the relative expanded uncertainty of 10 %(k=2). The content of viable count of enterobacter cloacae in the reference material is 10² cfu /vial, it can be dissolved directly, without dilution and easy to use, and this can reduce the sources of measurement uncertainty.
		2017 Vol. 38 (5): 527-531 [Abstract] ( 470 ) HTML (1 KB) PDF (557 KB) ( 512 )

	532	Development of Method and Software for Data Processing in Gas Chromatograph
		YE Guo-yang,XU Ke-jun
		DOI: 10.3969/j.issn.1000-1158.2017.05.03
		In order to optimize the data processing method of the gas chromatograph and improve its analysis accuracy, a two-step filtering method combining the median value filter with wavelet filter was studied for preprocessing the gas chromatography signal effectively. Two baseline correction methods were adopted to correct the baseline. Aiming at overlapping peaks, the intersection of vertical method and proportion method were proposed to improve the precision of separating peak greatly. MATLAB language was used in development of the off-line and on-line analysis software for implementing the above-mentioned processing methods. With the good user interface, the soft ware has achieved good application effect.
		2017 Vol. 38 (5): 532-537 [Abstract] ( 453 ) HTML (1 KB) PDF (1548 KB) ( 1495 )

	538	Development of Calibration Device for Formaldehyde Analyzer Based on Static Distribution Method
		SUN Xi-rong,ZHANG Wen-juan,GUAN Wei-jun,YU De-shui
		DOI: 10.3969/j.issn.1000-1158.2017.05.04
		According to the application requirements and research status, a newly formaldehyde analyzer calibration device was developed based on static distribution method, which can produce formaldehyde standard gas with accurately concentrations. It also has more advantages such as good reproducibility, strong robustness, and its uncertainty is smaller than 3%（k＝２）. This device can also be used to calibrate detectors, leak detectors or analyzers of methanol, ethanol, ethyl ether, benzene and a series of low boiling point organic gas, which solve quantity transmission and traceability issues of a large class of gas anaslyzers.
		2017 Vol. 38 (5): 538-542 [Abstract] ( 615 ) HTML (1 KB) PDF (651 KB) ( 514 )

	543	Evaluation of the Uncertainty in the Measurement of Specific Surface Area of Solids by Nitrogen Adsorption Using Static Volumetric Method
		YAN Xiao-ying,GAO Yuan,GUO Yan-jun
		DOI: 10.3969/j.issn.1000-1158.2017.05.05
		Nitrogen adsorption using static volumetric method was commonly used to determine the specific surface area of solids, it is based on the theory of multimolecular layer physical adsorption. A case study was reported for evaluating the uncertainty of the measurement results, where α-Al₂O₃ was measured using commercial instrument in accordance with the standard GB/T 19587—2004, determination of the specific surface area of solids by gas adsorption using the BET method. The uncertainty was analyzed in detail in each process of the testing. The main uncertainty components were identified as calibrating instruments, repeatability of mass weighing and least square fitting of data. The measurement result is (79.3±3.4) m2/g(k=2).
		2017 Vol. 38 (5): 543-547 [Abstract] ( 586 ) HTML (1 KB) PDF (356 KB) ( 611 )

	548	Establish of Spectroscopic Ellipsometry Model of Nanoscale HfO₂ Thin Films
		ZHANG Yin-hui,REN Ling-ling,GAO Hui-fang,JIA Ya-bin,Fu Weien,LIU Xiao-ping,Kim Changsoo,Yasushi Azuma
		DOI: 10.3969/j.issn.1000-1158.2017.05.06
		In order to establish a reliable thickness-measuring fitting model for approximate 1 nm thickness HfO₂ film using spectroscopic ellipsometry, the thickness of a ultrathin HfO₂ film was measured by a grazing incidence X-ray reflection diffractometer, which belongs to a part of country / region interlaboratory comparison and it used as the reference value of ellipsometry model thickness. It investigated the selected dispersion model and fitting parameters of HfO₂ film. The results show that the optimized fitting conditions are obtained, and Tauc-Lorentz 3 for the dispersion model is selected with wavelength ranging from 3.45 eV to 4.35 eV and the ratio of the HfO2 to porosity equals 60:40.
		2017 Vol. 38 (5): 548-552 [Abstract] ( 824 ) HTML (1 KB) PDF (610 KB) ( 465 )

	553	Adjustment and Error Analysis of the Length Measurement System for the Scale-bar Based on Photogrammetry
		TAN Ze-xiang,DONG Ming-li,YAN Bi-xi,SUN Peng,WANG Jun
		DOI: 10.3969/j.issn.1000-1158.2017.05.07
		The precision of a scale-bar directly influences the accuracy of measurement results as it is used as the length standard of photogrammetry. In order to ensure the measuring accuracy of a scale-bar length, a measurement system composed of a aerostatic guideway, a laser interferometer and a CCD imaging system are designed, and the influence factors of the accuracy of the measurement system are analyzed, meanwhile, the adjustment errors of the imaging position of retro-reflective target (RRT), the CCD camera optical axis, the laser interferometer, the scale-bar and the rotation around its own optical axis of CCD imaging system in the measurement system are calculated and analyzed to guide the adjustment processes of CCD imaging system, the laser interferometer and the scale-bar. Finally, the measurement system is used to measure the length of a kind of scale-bar at different times. The experimental result shows that the standard deviation of the scale-bar’s length can reach 1 μm which can meet the requirements of industrial photogrammetry.
		2017 Vol. 38 (5): 553-558 [Abstract] ( 580 ) HTML (1 KB) PDF (720 KB) ( 425 )

	559	Evaluation of Misjudgment Risks Caused by Measurement Uncertainty for Batch Product Inspection
		WANG Hong-tao,WANG Han-bin,CHEN Xiao-huai,CHENG Yin-bao,JIANG Rui
		DOI: 10.3969/j.issn.1000-1158.2017.05.08
		In order to reasonably pre-estimate the influence of measurement uncertainty on the results of batch product inspection, for total inspection and sampling inspection methods, misjudgment risks for both producer and consumer sides were quantified with indices of misjudgment probabilities. Based on absolute probability and conditional probability, models for the risks of total inspection were established, and on the basis, calculation formulas for sampling inspection were derived. Example results show that proposed models can comprehensively reflect risks caused by measurement uncertainty. The misjudgment probabilities calculated by absolute probability models can be used as the basis for the selection of the measurement plan for product inspection. The misjudgment probabilities calculated by conditional probability models can more directly reflect the risks for both producer and consumer sides and prompt inspectors to make decisions more carefully.
		2017 Vol. 38 (5): 559-562 [Abstract] ( 479 ) HTML (1 KB) PDF (468 KB) ( 773 )

	563	Error Analysis for Femtosecond Optical Pulse Reconstruction from Spectrum Measurement with Spectral Phase Interferometry for Direct Electric-field Reconstruction
		DENG Yu-qiang,SUN Qing,LYU Liang,WU Zhi-feng,DAI Cai-hong
		DOI: 10.3969/j.issn.1000-1158.2017.05.09
		Based on the technique of spectral phase interferometry for direct electric-field reconstruction (SPIDER), the effects of spectrum measurement error on femtosecond optical pulses reconstruction are studied. Two types of spectrum measurement errors, wavelength error and spectral irradiance error, are investigated. A low-pressure mercury lamp was used as a natural standard to calibrate the wavelength of the spectrometer. According to the calibration error, the influence of the wavelength error for the reconstructed pulse waveform is studied by blue-shift and red-shift with numerical simulations. The spectral radiation standard was used to calibrate the spectral irradiance of the spectrometer. The influence of spectral irradiance is simulatedly studied by increasing white noise. The reflective spectra from various reflectors were also measured, and the reconstructed waveforms from the spectra was compared and analyzed. The simulated and experimental investigations show that the relative standard uncertainties from both the wavelength error and the spectral irradiance error are within 1%.
		2017 Vol. 38 (5): 563-566 [Abstract] ( 719 ) HTML (1 KB) PDF (1086 KB) ( 761 )

	567	Research on the Photo-electric Characteristic Calibration of Solar Cells
		MENG Hai-feng,XIONG Li-min,ZHANG Jun-chao,HE Ying-wei,ZHANG Bi-feng,CAI Chuan,YE Feng-jun
		DOI: 10.3969/j.issn.1000-1158.2017.05.10
		Based on the solar simulator method, calibration equipment for terrestrial solar cell’s I-V characteristic was established. Herein, the method and procedure for its accurate measurement is proposed. To calculate its uncertainty, influencing factors such as irradiance intensity and spectral mismatch of the light source, spectral responsivity mismatch between the reference solar cell and tested solar cell, and temperature, etc. ,were analyzed here. The relative combined uncertainty of I_sc,V_oc and P_m were,1.2 % (k=2),0.9% (k=2),1.5 % (k=2).
		2017 Vol. 38 (5): 567-570 [Abstract] ( 788 ) HTML (1 KB) PDF (408 KB) ( 620 )

	571	A Research for Mobile Robot Navigation Based on Image Matching
		ZHU Qi-guang,WANG Zi-wei,CHEN Ying
		DOI: 10.3969/j.issn.1000-1158.2017.05.11
		In the process of mobile robot navigation based on SIFT algorithm, the speed of image matching is slow, the improved SIFT algorithm based on subtractive clustering and the binarized feature descriptor are proposed. Firstly, subtractive clustering is used to reduce the redundant points of feature points, which effectively reduces the feature number without affecting the stability of the original SIFT algorithm. The generated feature descriptors are binarized, indexes are produced by the Hash function, and Hamming distance as the metric. Experimental results show that compared with the original SIFT algorithm, in the improved SIFT algorithm ,the number of feature points is decreased by 30%~40%, the logarithm of the matched is basically unchanged, the matching rate increased by 6%~12% and the matching time decreased 60%~70%. Compared with the improved SIFT algorithm which based on color moment and hierarchical image matching, in improved SIFT algorithm the number of feature points is decreased by 15%~25%, the logarithm of the matched is basically unchanged, the matching rate increased by 5%~10% and the matching time decreased 45%~55%.
		2017 Vol. 38 (5): 571-575 [Abstract] ( 775 ) HTML (1 KB) PDF (811 KB) ( 511 )

	576	Image Feature Extraction Using Kernel Winner-take-all Based on Independent Component Analysis Algorithm
		CHEN Jie,SHANG Li
		DOI: 10.3969/j.issn.1000-1158.2017.05.12
		Utilized the property that kernel function learning can solve efficiently the linearly inseparable problem of image features, and combined advantages of sparse representation algorithm, a novel image feature extraction method is proposed. Here the sparse representation of images is realized by the winner-take-all rule based independent component analysis method, which can extract image high-dimension features efficiently and has quicker convergent speed, because it is unnecessary to optimize high-order nonlinear function and estimate sparse density. Compared with the winner-take-all rule based independent component analysis method, the experiment results in PolyU database testify that image features extracted by the combination method of kernel function learning and sparse representation can favor to improve the precision of feature classification.
		2017 Vol. 38 (5): 576-579 [Abstract] ( 853 ) HTML (1 KB) PDF (504 KB) ( 458 )

	580	Measurement for Coefficient of Retroreflected Luminance by Direct Luminance Method
		ZHAO Fei-hu,QIAO Wei-dong,ZHAO Min,LI Yi,ZHANG Jian
		DOI: 10.3969/j.issn.1000-1158.2017.05.13
		The direct luminance method is used to measure the coefficient of retroreflected luminance. The test system is build and the experiment is carried out with the retroreflected marks as the test object.The test and comparison of the direct luminance method and direct luminous intensity method is conducted.The experiment results show that the direct luminance method has obvious advantages on the aspects of the stray light requirement of the darkroom, the measurement object, the measurement distance, and the measurement accuracy. At the same time the direct luminance method has the advantages that the measurement process is simple and the measurement uncertainty reach 3.27%(k=1.96).
		2017 Vol. 38 (5): 580-583 [Abstract] ( 889 ) HTML (1 KB) PDF (318 KB) ( 595 )

	584	Calibrating Pyrometers with High Temperature Fixed Points
		LU Xiao-feng,YUAN Zun-dong,DONG Wei,WANG Tie-jun,LUAN Hai-feng,XIAO Xiao-ting
		DOI: 10.3969/j.issn.1000-1158.2017.05.14
		A 0.65 μm and a 0.9 μm pyrometers are interpolated by three high temperature fixed points (HTFPs), the best uncertainty is estimated 0.3～1.2 ℃ (k=2) in 900～2 500 ℃ for the 0.65 μm pyrometer and 0.3～0.6 ℃ in 600～2 000 ℃ for the 0.9 μm one separately. The pyrometers are also verified by the other fixed points and high temperature blackbody against the primary pyrometer, and the agreement is better than 0.1 ℃. The HTPFs can be applied in the precise calibration of pyrometers to improve the level of measurement uncertainty in high temperature range.
		2017 Vol. 38 (5): 584-588 [Abstract] ( 544 ) HTML (1 KB) PDF (1553 KB) ( 512 )

	589	Study on the Performance of the Low-temperatureBlackbody Radiation Source
		ZHAO Yi-kun,WANG Jing-hui,YUAN Zun-dong,XUE Wen-yan
		DOI: 10.3969/j.issn.1000-1158.2017.05.15
		A new low-temperature blackbody radiation source is developed as low as -30 ℃ by semiconductor refrigeration technology and heat pipe technology. The temperature stability is better than 0.02 ℃/20min, axial temperature uniformity of this cavity wall is better than 0.3 ℃ and the effective emissivity of the heat pipe cavity is higher than 0.999 2 by experimental research. The effective emissivity of the blackbody cavity is evaluated by optical ray tracing with a Monte Carlo method, it is calculated that the emissivity of the heat pipe cavity from the center to the edge is gradually decreasing, and the average rate of change of the emissivity is only 0.06 ‰, it shows that the axial uniformity of the temperature field has little effect on the normal mean effective emissivity.
		2017 Vol. 38 (5): 589-592 [Abstract] ( 508 ) HTML (1 KB) PDF (1018 KB) ( 747 )

	593	Study on the Calibration Method of the Tip Area Function of the Nanoindenter at Super Low Depth
		WANG Xin-wei,TAO Xing-fu,LI Xu,HE Zhi-yong,REN Ling-ling
		DOI: 10.3969/j.issn.1000-1158.2017.05.16
		Three methods were used to calibrate the tip area function of the nanoindenter at super low indentation depth, they are direct method based on atomic force microscope (AFM), spherical surface fitting method and indirect method based on the measurement results of the reference block of fused silica. It was revealed that tip area function calibrated by the direct method is mostly reliable and precise, of which the geometry morphology of the top end of the nanoindenter tip was truly fitted. Moreover, the corresponding mathematical model was established to analysis the main error of the AFM method, which was the error caused by the curvature radius of the AFM tip. The results show, under the super low indentation depth, the relative error of the tip area function of the nanoindentation is increasing with the decrease of indentation depth, which is mainly due to the curvature radius of the AFM tip. The result of the study is meaningful to the nanoindentation measurement of the thin films, of which super low indentation depth is usually required.
		2017 Vol. 38 (5): 593-597 [Abstract] ( 905 ) HTML (1 KB) PDF (686 KB) ( 615 )

	598	Feature Frequency Extraction Method Based on Mean Envelope ITD and Spectral Kurtosis
		ZHANG Shu-qing,DONG Yu-lan,ZHANG Li-guo,YAN Bing,HUANG Wen-jing,XU Jian-tao,HE Peng
		DOI: 10.3969/j.issn.1000-1158.2017.05.17
		A feature frequency extraction method based on mean envelope ITD and spectral kurtosis is proposed.Was applied to the bearing fault diagnosis, the vibration signal was first decomposed and reconstructed by the mean ITD. Then the resonance frequency band was selected automatically through the spectrum kurtosis. Finally, the bearing fault could be diagnosed by comparing the envelope spectrum and the characteristic frequency. The analysis result to the data from Case Western Reserve University bearing center and real project proves that it could get more obvious spectrum and more accurate diagnosis by the mean envelope ITD and spectral kurtosis method.
		2017 Vol. 38 (5): 598-601 [Abstract] ( 600 ) HTML (1 KB) PDF (1297 KB) ( 646 )

	602	Enhancement and Extraction of Gear Weak Impact Fault Signal Based on an Adaptive Stochastic Resonance
		LI Ji-meng,ZHANG Yun-gang,ZHANG Jin-feng,XIE Ping
		DOI: 10.3969/j.issn.1000-1158.2017.05.18
		Aiming at the problem of impact signal detection under strong noise background, an adaptive stochastic resonance method for enhancement and extraction of gear weak impact Fault Signal is proposed. First, a new modified kurtosis index is constructed by using kurtosis index and correlation coefficient, which is applied as the measurement index of stochastic resonance for the detection of impact signals. Second, a data segmentation algorithm via sliding window is adopted to segment the impact signal with different impact amplitudes into multiple sub-signals with single impact component, which are used as the system input of stochastic resonance. And the genetic algorithm is employed to realize the adaptive selection of system parameters. Finally, the proposed method is applied to gearbox fault diagnosis of traveling unit of electric locomotive. The results show that this method can effectively extract the features of gear fault.
		2017 Vol. 38 (5): 602-606 [Abstract] ( 756 ) HTML (1 KB) PDF (1076 KB) ( 592 )

	607	Characteristics Analysis and Detection of Torsional Vibration for Single Phase Series Motor
		ZHAO Hao
		DOI: 10.3969/j.issn.1000-1158.2017.05.19
		The working principle of single phase series motor is described, and the corresponding mathematical model is established, also the expression of electromagnetic torque is deduced. The torsional vibration of single phase series motor is detected under various operating conditions, the torsional vibration-load characteristics and torsional vibration-voltage characteristics are obtained. The theoretical analysis is carried out to obtain the corresponding conclusion, according to the torque expression and torque balance equation of single-phase series motor, which provides an technical support for the torsional vibration suppression of single phase series motor.
		2017 Vol. 38 (5): 607-610 [Abstract] ( 568 ) HTML (1 KB) PDF (509 KB) ( 616 )

	611	l_2,p - norm Based on the Image Reconstruction Algorithm for ECT
		MA Min,GUO Qi,YAN Chao-qi,XUE Qian
		DOI: 10.3969/j.issn.1000-1158.2017.05.20
		Aiming at the problem of the loss of the details of the reconstructed image caused by excessive smoothness of the Tiknonov regularization in the image reconstruction of electrical capacitance tomography(ECT) system, an image reconstruction model with norm l_2,p(0<p≤1), which combines the smoothness of Euclid normand the sparsity of norm l_p(0<p≤1) matrix norm is presented, which is non-convex and non-Lipschitz continuous problem . The extensive experiments have showed, the l_2,p-minimization, which has stronger adaptability, higher resolution and better image quality, is better than the Newton iterative method, conjugate gradient method and traditional singular value decomposition algorithm.
		2017 Vol. 38 (5): 611-615 [Abstract] ( 599 ) HTML (1 KB) PDF (736 KB) ( 686 )

	616	The Focused Ultrasound Nonlinear Acoustic Field Detection Method Based on Empirical Mode Decomposition
		ZHENG Hui-feng,CAO Wen-xu,WANG Yue-bing,YU Qun,FANG Piao-piao
		DOI: 10.3969/j.issn.1000-1158.2017.05.21
		For accurately measurement of harmonic component of the focused ultrasound field and obtain the distribution, the focused ultrasound harmonic detection method which based on EMD in research of focused ultrasound nonlinear acoustic field is presented. First, to analysis the sound signals by using EMD. Then, noise criterion included in IMF by noise criterion is determined. Finally, by using Fourier transform on new signals, the amplitude of each harmonic could be showed on the result. Compared with the traditional method FFT, the focused ultrasound nonlinear acoustic field detection method could effectively suppress the noise; through the result it could obtain smoother harmonic distribution. The new method would make contribution in harmonic imaging and medical ultrasound.
		2017 Vol. 38 (5): 616-620 [Abstract] ( 539 ) HTML (1 KB) PDF (1846 KB) ( 487 )

	621	Comparison of Reciprocity and Surface Pulse Methods for AE Sensor Calibration
		WANG Yu-ying,HE Long-biao,ZHU Hai-jiang,YANG Ping
		DOI: 10.3969/j.issn.1000-1158.2017.05.22
		Acoustic emission sensor calibration is the precondition for the quantitative detection of acoustic emission technique, reciprocity and surface pulse methods are main calibration methods. In order to investigate and verify the consistency of the two methods, reciprocity coefficient and equivalent reciprocity coefficient in surface pulse method of Rayleigh wave were calculated and compared. Time domain and frequency domain components of the force pulse and the corresponding velocity were obtained respectively by equivalent treatment of loading force and laser vibrometer. Based on the physical meaning of reciprocity coefficient, equivalent reciprocity coefficient is calculated by the ratio of the normal velocity to the exciting force per unit. Meanwhile the calibration systems of reciprocity and surface pulse method were established, the calibration results were compared and analyzed. Real and equivalent reciprocity coefficient calculations, as well as the experimental results based on the calibration system, showed good agreements between reciprocity and surface pulse method. The results also showed that effect of radial resonance of acoustic emission transducers caused by electrical excitation can be ignored in reciprocity calibration.
		2017 Vol. 38 (5): 621-625 [Abstract] ( 591 ) HTML (1 KB) PDF (898 KB) ( 630 )

	626	Incipient Fault Detection of Generators in Wind Turbines Based on Sample Entropy
		XIE Ping Yi-fan WANG JIANG Guo-qian Meng-Jun HUANG HE Qun
		DOI: 10.3969/j.issn.1000-1158.2017.05.23
		In order to test the generator incipient faults, such as stator windings inter-turn and broken rotor bars, which have such characteristics with small amplitude, non-stationary and susceptible to load variations, a sample entropy algorithm is introduced to perform fault feature extraction from the stator current and electromagnetic torque signals of generators in wind turbines. The proposed method is used to analyze fault signals under different load conditions to realize the quantitative representation of faulty signals. The results demonstrate that sample entropy algorithm is applicable to achieve fault characteristics quantification with data of short length, especially under varying operations and noise environments and it has great potentials in early fault detection and real-time online monitoring.
		2017 Vol. 38 (5): 626-630 [Abstract] ( 654 ) HTML (1 KB) PDF (509 KB) ( 568 )

	631	The Parameter Identification of Permanent Magnet Synchronous Motor Based on Improved Cuckoo Search Algorithm
		WU Zhong-qiang,DU Chun-qi,ZHANG Wei,LI Feng
		DOI: 10.3969/j.issn.1000-1158.2017.05.24
		Based on improved cuckoo search algorithm, a kind of parameter identification method of permanent magnet synchronous motor is proposed. In view of the deficiency of cuckoo search algorithm, designing the fuzzy reasoning based on cloud membership to adjust the probability of an alien egg discovered by host nests and using adaptive variable step method to adjust step size of Lévy flights. The improved algorithm can accelerate the convergence speed and improve the local and global optimization ability by increasing the diversity of the population. Permanent magnet synchronous motor multi-parameter identification results show that improved cuckoo algorithm can effectively identify the motor parameters, and compared with the unmodified algorithm, the improved algorithm show the effectiveness and superior performance.
		2017 Vol. 38 (5): 631-636 [Abstract] ( 626 ) HTML (1 KB) PDF (1237 KB) ( 427 )

	637	Logic Stochastic Resonance Induced by a Nonlinear Fractional Bistable System
		ZHENG Yong-jun,ZHU Zeng-xian,ZHU Shan-an
		DOI: 10.3969/j.issn.1000-1158.2017.05.25
		Based on the logic stochastic resonance of integer-order Langevin equation, a fractional-order Langevin equation is constructed. A simulation verification for the nonlinear fractional bistable system based on this equation is carried out, and the impact on logic stochastic resonance phenomenon when changing fractional order and system parameters is analyzed. The results show that when the fractional order is less than the critical value, even if no additional Gaussian white noise or weak periodic signal the logical stochastic resonance phenomenon can be observed; when the fractional order is greater than the critical value, the additional Gaussian white noise or weak periodic signal is necessary in order to achieve logical stochastic resonance, the success rate of logical output can be increased by selecting appropriate noise intensity, amplitude and frequency of weak periodic signal.
		2017 Vol. 38 (5): 637-640 [Abstract] ( 631 ) HTML (1 KB) PDF (796 KB) ( 514 )

	641	Measurement Uncertainty Propagation Law for VNA in Frequency Domain Channel Measurement
		ZHOU Xin,FENG Zhi-gang,ZHONG Zhang-dui,BIAN Xin,AI Bo,LIU Ke,GUO Xiao-tao,ZHAO Xing
		DOI: 10.3969/j.issn.1000-1158.2017.05.26
		The measurement uncertainty is introduced by measurement instruments in frequency domain channel measurement systems. The measurement instrument, Vector Network Analyzer, need to be calibrated before measurement. The uncertainty analysis for various calibration methods is the foundation to make a judicious choice of calibration methods. The uncertainty analysis is based on Monte Carlo method. To account for the correlations between S-parameter measurements for different frequencies, covariance-matrix-based analysis is performed. The experiments in this paper show that correlations have a strong influence on the uncertainties of channel parameter measurements. Based on the quantitative analysis, the “response” calibration is suggested for channel measurements.
		2017 Vol. 38 (5): 641-644 [Abstract] ( 621 ) HTML (1 KB) PDF (820 KB) ( 423 )

	645	Study on the Calibration Method for Relative Path Attenuation of MIMO Channel Simulator
		HOU Li-xin,ZHAO Hai-ning,TIAN Fei,ZHAO Xing,YANG Li
		DOI: 10.3969/j.issn.1000-1158.2017.05.27
		The channel power delay profile is measured using channel estimation techniques and therefore relative path attenuation of MIMO channel simulator is calibrated. The calibration system is traceable with the standard network which is made of delay line and attenuator. The experiment results show that the range of calibrating relative path attenuation is from 0 to -25 dB. At 500 MHz radio frequency and 300 ns relative path delay point, the expanded uncertainty of relative path attenuation is 0.35 dB(k=2).
		2017 Vol. 38 (5): 645-649 [Abstract] ( 539 ) HTML (1 KB) PDF (984 KB) ( 628 )

	650	Soft Sensor Modeling Based on CSSE-OSELM Algorithm and Its Industrial Application
		LI Rong-yu,QI Gui-hong
		DOI: 10.3969/j.issn.1000-1158.2017.05.28
		According to the characteristics of soft sensor modeling samples,a soft sensor modeling method called cuckoo search selective ensemble of online sequential extreme learning machine(CSSE-OSELM) is proposed.First of all, OSELM individuals were assembled into the framework of integrated learning,and each OSELM individual is endowed with weight and threshold.Then,with the aid of the cuckoo search algorithm,choose out OSELM individuals,which satisfy the threshold condition ,to a subset of the combined into integrated learning.Finally soft sensor model is established with the subset, with integrating learning and weighted processing.Using UCI standard data sets to test, at the same time, the jet fuel for hydrocracking reaction distillation tower is verified, the simulation results show that the algorithm is superior to the traditional method, with higher prediction precision and stable performance.
		2017 Vol. 38 (5): 650-655 [Abstract] ( 595 ) HTML (1 KB) PDF (1384 KB) ( 407 )

	656	GUM and Analysis of Measurement Uncertainty Evaluation Using Observation Equation
		HU Hong-bo,SUN Qiao,DU Lei,FAN Zhe,BAI Jie
		DOI: 10.3969/j.issn.1000-1158.2017.05.29
		The process of uncertainty evaluation methods based on GUM serials and Bayesian analysis is compared, and it is derived that GUM uncertainty evaluation is based on measurement equation, and a forward uncertainty evaluation method, while Bayesian analysis is an inverse uncertainty evaluation based on observation equation. A probabilistic approach to analysis and comparison is used to the two approaches. It’s concluded that for linear model and with non-informative prior for the measurand both analysis can be applied and get the same result, but for non-linear model, only GUM S1 method and Bayesian analysis give the same result. The results are illustrated by examples.
		2017 Vol. 38 (5): 656-660 [Abstract] ( 641 ) HTML (1 KB) PDF (702 KB) ( 478 )

News

Download

Links

Copyright © Editorial Board of Acta Metrologica Sinica
Supported by:Beijing Magtech