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2024 Vol. 45, No. 4
Published: 2024-04-28
 
465 Design and Measurement of Micro-displacement Detection System Based on Solid State Quantum Spin Regulation
LI Zhonghao,LIU Yuqi,ZHANG Hao,LIU Xin,ZHANG Jiaxuan
DOI: 10.3969/j.issn.1000-1158.2024.04.01
In order to realize high-precision micro-displacement detection, the nitrogen-vacancy (NV) color center magnetometer is taken as the basis, and testing is conducted using the quantum spin regulation principle and uniform variation of spatial gradient magnetic field. Firstly, the gradient magnetic field is constructed with uniform variation by the permanent magnet, and the correlation between the magnetic field gradient and displacement is obtained. Secondly, the Ramsay sequence parameters required in the experiment is determined by testing the NV color center optical detection magnetic resonance (ODMR) frequency points and determining the quantum flip period corresponding to the Rabi oscillation in the time domain. Finally, the correlation of fluorescence intensity and magnetic field gradient is completed based on the Ramsey magnetic field measurement principle. The relationship between fluorescence intensity and micro-displacement change is obtained, and the micro-displacement measurement is realized. The minimum resolution of displacement is about 104nm.
2024 Vol. 45 (4): 465-470 [Abstract] ( 146 ) HTML (1 KB)  PDF (5742 KB)  ( 191 )
471 A 3D Reconstruction Method Based on Stereo Target Location
CHEN Yuan,LUO Zai,YANG Li,JIANG Wensong
DOI: 10.3969/j.issn.1000-1158.2024.04.02
In order to solve the problem of large data splicing error caused by lack of feature information of line laser sensor, a method of line laser data splicing based on stereoscopic target positioning is proposed. The target point library is constructed by the spatial geometry constraint of binocular stereo vision, and the position calibration of stereo target coordinate system and linear laser coordinate system is realized. Canny edge detection, sub-pixel edge extraction, ellipse fitting and other algorithms are used to identify and locate circular feature points. The homologous points of the collected local landmarks are matched with the target point library, the real-time pose of the line laser sensor is calculated. The initial coordinates of line laser are unified with the global coordinate system by coordinate system transformation, and the three-dimensional reconstruction of point cloud is realized. The experimental results show that the average absolute error of target calibration is 0.078mm, the average fitting error of the measured standard parts is 0.127mm. Compared with the Coordinates Measuring Machine (CMM), the average measuring error of this method is 0.165mm. Compared with the results of robot positioning splicing and depth camera measurement, the measurement system built has smaller average measurement error and standard deviation, which can meet the demand of real-time multi-angle scanning of complex surfaces.
2024 Vol. 45 (4): 471-479 [Abstract] ( 156 ) HTML (1 KB)  PDF (23472 KB)  ( 64 )
480 Research on Measurement of Fried Dough Twists Drill Edge Band Width Based on LM Method
ZHOU Zheng,TAI Ligang,CHEN Zhiyuan,ZHANG Yu
DOI: 10.3969/j.issn.1000-1158.2024.04.03
A detection method of twist drill blade width based on binarization is proposed. Firstly, the target edge is sharpened, and then the edge information is extracted by Butterworth high-pass filtering. Secondly, through the improved Otsu binarization algorithm, the suspected edge points are threshold segmentation and the coordinates of the edge points are obtained. Again, the Levenberg-Marquardt(LM) method is used to fit the points near the edge, so as to get the edge band width curve and its inflection point, and get the data of edge band width of twist drill. Finally, the contrast experiment is carried out, and the untreated M35 blade image with a diameter of 2.5cm is processed by LM method, the blade width is 1.467mm, and the measurement error is 0.467mm.. The improved measurement result is 0.853mm and the measurement error is 0.147mm.
2024 Vol. 45 (4): 480-488 [Abstract] ( 92 ) HTML (1 KB)  PDF (15313 KB)  ( 48 )
489 Multi-channel Anti-crosstalk Spectral Confocal Displacement Measurement Method
SUN Zhenguo,LI Jiafu,LUO Mingzhe,LI Yifan,HU Jiacheng
DOI: 10.3969/j.issn.1000-1158.2024.04.04
Propose a displacement measurement method to address the issue of mutual interference between different confocal points in a scanning spectral confocal measurement system. Maintain the independence between multiple measurement channels by using optical fiber bundles and employ optical switches to switch between measurement channels to prevent interference. The system comprises seven focal points arranged in an equilateral hexagon, with six points positioned at the hexagons vertices and one focal point at its center, yielding a hexagon side length of 43.27μm. Displacement measurement experiments indicate an absolute error of less than 0.15μm across all measurement channels and a range of 0～90μm. In experiments involving step surfaces, with two steps of 30μm height difference, the maximum error is 0.16μm. In sphere radius measurements,all seven channels can measure without the need to move the measurement system or the object being measured. A fitted approximation for a sphere with a radius of 5mm yields a maximum error of 80.92μm. Compared with traditional methods, this method shows higher precision and resolution.
2024 Vol. 45 (4): 489-495 [Abstract] ( 91 ) HTML (1 KB)  PDF (10015 KB)  ( 54 )
496 Development of Geometric Profile Calibration Device for Standard Nuclear Fuel Assembly
SUN Anbin,GAO Ting,CAO Tieze, QIAO Lei
DOI: 10.3969/j.issn.1000-1158.2024.04.05
The standard nuclear fuel assembly is used for the on-site calibration of the nuclear fuel assembly measuring instrument. For the traceability requirements of geometric parameters of standard nuclear fuel assemblies, a geometric profile calibration device for standard nuclear fuel assembly is developed. Based on the concept of spatial coordinate measurement, the device uses multi-channel contact sensors as the profile measurement unit, and obtains the profile coordinates by combining the height position of the measuring table. Through straightness and torsion measurement and error compensation, the precision of geometric contour measurement is further improved. By integrating motion control and special measurement software, the standard nuclear fuel assembly geometric profile parameters (straightness, torsion, perpendicularity, parallelism) can be automatically detected. Through analysis and test, it is verified that the standard uncertainty of straightness and parallelism is 0.01 mm, the standard uncertainty of torsion is 0.007 mm and the standard uncertainty of perpendicularity is 0.017 mm. The above data show that the device can meet the traceability requirements of standard nuclear fuel assemblies.
2024 Vol. 45 (4): 496-502 [Abstract] ( 98 ) HTML (1 KB)  PDF (7928 KB)  ( 59 )
503 Investigation on the Influence of Alignment Angle Error of the Polarization Analyzer on Polarization Coupling easurement of Fiber Coil
WANG Xueqin,CAO Zhifeng,LIANG Lanju
DOI: 10.3969/j.issn.1000-1158.2024.04.06
To investigate the influence of the alignment angle error between the polarization axis of polarization analyzer and the fiber polarization axis on the measurement results of the polarization coupling intensity of the fiber coil, the basic principle of using optical coherence domain polarization detection (OCDP) technology to test the polarization coupling intensity of the fiber coil is theoretically analyzed, and the relationship model between the coupling intensity of the polarization coupling point in the fiber coil and the alignment angle of the polarization analyzer is established. According to the relationship model, the variation of the measured value of polarization coupling intensity at the coupling point with the alignment angle of the polarization analyzer is simulated and analyzed. The simulation results show that the measurement error reaches minimum when the alignment angle between the polarization axis of the polarizer and the polarization axis of the fiber coil is 45°. The more the alignment angle deviates from 45°, the greater the intensity measurement error will be. When the alignment angle error between the polarization axis of the polarization analyzer and the polarization axis of the fiber coil is 0.6°, the measurement error of the polarization coupling intensity caused by the alignment angle error is 0.18dB. The measurement error of polarization coupling intensity caused by the error of polarization axis to axis can be less than 1dB by controlling the error of alignment angle within 3°.
2024 Vol. 45 (4): 503-507 [Abstract] ( 94 ) HTML (1 KB)  PDF (1926 KB)  ( 55 )
508 Research on Nonlinear Response of Silicon Detectors Based onInfrared Laser Integrating Sphere
WANG Bingkai,HUAN Kewei,AN Baolin,ZHAO Yunlong,DONG Wei,LI Yiwen
DOI: 10.3969/j.issn.1000-1158.2024.04.07
so it is xery important to study the nonlinearity of the filter radiometer in this band. A nonlinear measurement system for spectral response of silicon detector was designed and built based on the flux multiplication method of single-phase dry light source double optical path. The flux was regulated by double-violet external fused quartz spectroscope, and the detector field of view was completely filled by integrating sphere to improve the repeatability of incident light in the photosensitive area of the detector. The high absorption light trap was used to avoid multiple reflections during flux regulation. The experiment extends the photocurrent range by switching the neutral density filter, and characterizes the nonlinearity of the 0.9μm filter radiometer in the photocurrent range 1.6×10-8～8×10-6A. The nonlinear value of single measurement is -8.7×10-5～4.8×10-5, the standard uncertainty of single measurement is better than 3.7×10-4, the nonlinear value of cumulative measurement is -2.7×10-4, and the standard uncertainty is better than 7.6×10-4.
2024 Vol. 45 (4): 508-513 [Abstract] ( 106 ) HTML (1 KB)  PDF (3989 KB)  ( 72 )
514 Measurement of the True Temperature at the Bottom of a Blackbody Cavity Based on Active Laser Radiation Thermometry
WANG Xinyu,AN Baolin,ZHANG Xinda,DONG Wei,YAN Quanying,ZHAO Yunlong,ZHAI Huixing
DOI: 10.3969/j.issn.1000-1158.2024.04.08
The true temperature and uniformity of the blackbody cavity bottom are the key factors affecting the evaluation of the cavity emissivity, but the existing studies for the temperature uniformity characterization are mostly based on the brightness temperature. An active laser radiation thermometry technique, which is capable of emissivity-free temperature measurement, is applied to carry out a study on the real surface temperature and uniformity measurement of the cavity bottom of a blackbody radiation source in 973K. Meanwhile, based on the measured temperature field data, the Monte-Carlo method was used to numerically simulate the effective emissivity distribution of the cavity, obtaining the simulation results at typical positions and combining with the bright temperature data to obtain the true temperature field at the bottom of the cavity. And compared with the direct measurement results of the surface real temperature by active laser radiation thermometry, the results show that for the nine selected measurement points, the relative deviations of the two are between 0.04% and 0.77%. The good agreement verifies the feasibility of the active laser radiometric thermometry technique for true temperature measurements at the bottom of the cavity of a blackbody radiation source.
2024 Vol. 45 (4): 514-519 [Abstract] ( 87 ) HTML (1 KB)  PDF (6678 KB)  ( 76 )
520 Research on the Influence of Cavity Effect on Integrated Blackbody High-temperature Emissivity Measurement
SUN Luge,AN Baolin,ZHAO Yunlong,WANG Bingkai,ZHAI Huixing,DONG Wei,WANG Ruixiang
DOI: 10.3969/j.issn.1000-1158.2024.04.09
Theoretical models for correction factors of non-isothermal boundary cavity effects in integrated blackbody method are proposed. Based on the finite element method, theoretical calculations of correction factors for non-isothermal boundary cavity effects are carried out under different emissivity samples and specific temperature fields. These calculations are compared with correction factors obtained based on the Monte Carlo ray tracing method, showing good agreement with a maximum deviation of no more than 2.5%. The results indicate that with longer wavelengths and lower sample emissivity, the cavity effect has a greater impact on emissivity measurement results. Emissivity measurements of platinum material samples are conducted at 1000°C temperature and within the wavelength range of 12~14μm. These measurements are compared with results obtained using the discrete blackbody method. After correction, the consistency between the integrated blackbody method and the discrete blackbody method is improved from 0.08 to 0.03. This result verifies the feasibility of introducing correction factors for non-isothermal boundary cavity effects in the theoretical model and improves the accuracy of emissivity measurement using this method.
2024 Vol. 45 (4): 520-526 [Abstract] ( 89 ) HTML (1 KB)  PDF (6229 KB)  ( 68 )
527 The Influence of Inducing Methods on the Zinc Freezing Plateaus
HU Ziliang,YAN Xiaoke,XIONG Yaxuan,ZHANG Mingyu
DOI: 10.3969/j.issn.1000-1158.2024.04.10
The zinc freezing point is the defining fixed-point of the International Temperature Scale of 1990 (ITS-90). Also, it is an important reference point for calibrating standard platinum resistance thermometers (SPRT). In order to improve the level of realization of the zinc freezing point, the zinc fixed point cell with metal shell was used to study the influence of different inducing methods on the zinc freezing plateaus and supercoolings. The Overall Maximum Estimate (OME) method was adopted to determine the impurity concentration. The reliability of the cell was evaluated using the changes of the impurity concentrations and the differences between the melting plateaus and freezing plateaus. The results showed that the zinc fixed point cell with metal shell had good reliability; under different induction times, the value of zinc freezing plateaus obtained by using quartz, stainless steel and nickel inducation rods was consistent in the range of 0.15 mK, that is, the different inducing methods can obtain good zinc freezing plateaus; and the inducing methods had no effect on the supercoolings of high purity zinc.
2024 Vol. 45 (4): 527-532 [Abstract] ( 108 ) HTML (1 KB)  PDF (5731 KB)  ( 54 )
533 Experimental study of thermal and physical properties of aviation kerosene
RONG Youzhan,WANG Fei,JIN Hao1,HOU Lintong,YANG Meng,XU Jingyu
DOI: 10.3969/j.issn.1000-1158.2024.04.11
Experimental studies on the thermophysical property parameters in the temperature range of -10℃~40℃ were carried out for hydrocarbon fuels widely used in aircraft engines. Taking aviation kerosene provided by a testing center as the test sample, its density, viscosity, compression coefficient and expansion coefficient at different temperatures were tested. The results show that the viscosity and compression coefficient of aviation kerosene are positively correlated with temperature, while the density is negatively correlated with temperature, and the expansion coefficient of aviation kerosene shows complex fluctuations with increasing temperature. In this basis, the mathematical prediction models of density, viscosity, compression coefficient and expansion coefficient with temperature were proposed by combining the measurement results of each parameter at standard temperature.
2024 Vol. 45 (4): 533-539 [Abstract] ( 129 ) HTML (1 KB)  PDF (5749 KB)  ( 40 )
540 Measurement of Viscosity Coefficient of Unknown Gas Based on Poiseuille’s Law
TANG Bowen,PENG Yuexiang,ZHANG Yu,ZUO Aibin
DOI: 10.3969/j.issn.1000-1158.2024.04.12
To study and measure the viscosity coefficient of unknown gas,a simple measuring device based on capillary was built. According to Poiseuille’s law,the relationship between gas volume flow and viscosity coefficient was established. With N2 as the calibration standard gas,the viscosity coefficients of H2,CO2 and synthetic air in the temperature range of 280~320K and the pressure range of 169~376kPa were calculated by measuring the volume flow. The reliability of this method is theoretically analyzed,and the results are compared with the viscosity coefficient in NIST database. The relative error rate of this method is in the range of ［-1.109%,1.779%］ when the differential pressure is in the range of 103~206kPa.
2024 Vol. 45 (4): 540-545 [Abstract] ( 76 ) HTML (1 KB)  PDF (3721 KB)  ( 34 )
546 An Image Reconstruction Method of ECT Based on Two-step Regularization Gauss-NewtonIterative Algorithm
ZHANG Lifeng,CHEN Da,LIU Weiliang
DOI: 10.3969/j.issn.1000-1158.2024.04.13
Electrical capacitance tomography (ECT) is a nonlinear problem and has serious ill-posed. In order to improve the accuracy of image reconstruction, an ECT image reconstruction method based on two-step regularized Gauss-Newton iterative algorithm is proposed. Aiming at the non-convergence problem of standard regularized Gauss-Newton iterative algorithm in image reconstruction, a two-step iterative method is introduced. The regularization matrix is improved, which improves the accuracy of estimation. Considering the dependence of Gauss-Newton algorithm on the initial value of iteration, homotopy algorithm is added. Finally, the simulation and static experiment are carried out, and compared with the linear back projection (LBP) algorithm, Landweber algorithm and Tikhonov regularization algorithm, the results show that this method can effectively improve the accuracy of image reconstruction.
2024 Vol. 45 (4): 546-551 [Abstract] ( 74 ) HTML (1 KB)  PDF (10686 KB)  ( 35 )
552 Establishment and Verification of Real-time In-use Measurement System for Ultrasonic Flowmeter
LI Wenli,LI Chunhui,LI Mengna,JIN Yuqiang,XIE Dailiang
DOI: 10.3969/j.issn.1000-1158.2024.04.14
To realize a real-time monitoring of ultrasonic flowmeter accuracy, a real-time in-use measurement system of ultrasonic flowmeter based on the high pressure closed loop facility was developed, which was combined with a prediction model of ultrasonic flowmeter with the relationship between signal parameters (including sound velocity deviation) and indicating value error based on random forest algorithm, and LabVIEW software platform. Within the measurement system, three characteristic signals of ultrasonic flowmeters, including signal quality, flow state index, sound speed index, can be real-time collected, and the simultaneous prediction of flowmeter indication error from the prediction model was obtained. The experimental tests were carried out in the range of 160~800m3/h, which showed that the deviation between the real error and the prediction error of the flowmeter was within the range of±0.42%.
2024 Vol. 45 (4): 552-558 [Abstract] ( 127 ) HTML (1 KB)  PDF (5903 KB)  ( 138 )
559 Multi-defective Lattice Structure Performance Parameter Prediction Method Based on XGBoost Model
ZHANG Zhiwei,ZHANG Yuyan,WEN Yintang,REN Yaxue
DOI: 10.3969/j.issn.1000-1158.2024.04.15
To address the problem that the diversity and randomness of defects in additively manufactured metal lattice structures make it difficult to accurately predict their mechanical properties, a model for predicting the yield stress of lattice structures based on the parameter optimization XGBoost model was proposed. Based on CT test data, a threshold judgement criterion was proposed for the rapid detection and classification of multiple defects. Focusing on the problems of strut diameter size and angular deviation defects, the number of defects dominated by oversized struts, undersized struts, and waviness struts were used as input features of the model, respectively. The number of layers was used as another input feature, considering the randomness of defect locations. Based on the measured data, a simulation model of the defect-containing lattice structure was established, and its yield stress was simulated. Using the parameter optimization method to optimize the prediction model hyperparameters and combining the results of the yield stress simulation, the prediction of the yield stress of the structural member is achieved with an R2 of 0.81 and an RMSE of 18.87. A comparison between the prediction results and the actual sample test results was provided in the experimental section, and the deviation is 7.6%, which shows that the prediction model can accurately predict the yield stress of the structure.
2024 Vol. 45 (4): 559-564 [Abstract] ( 97 ) HTML (1 KB)  PDF (8000 KB)  ( 34 )
565 Sensitivity Compensation Method for Hydrophones with Different Scales in Vibrating Liquid Column Tube
XIE Jianyu,WANG Yuebing,ZHAO Peng,ZHANG Kai,WANG Mingwei
DOI: 10.3969/j.issn.1000-1158.2024.04.16
A sound field model in the tube was established using COMSOL simulation software for different scales of spherical and cylindrical hydrophones. The interference of different scales of hydrophones on the sound field was analyzed, and the pressure sensitivity of different scales of hydrophones was compensated and corrected accordingly. The hydrophones of different scale were calibrated using a vibrating liquid column calibration device in the frequency band of 100~1000Hz, and the comparison results with the compensated hydrophone sensitivity value indicated that the size of the hydrophone affects the distribution of the surrounding sound field, resulting in uneven distribution of the sound field in the tube. When the size of the sensitive element is close to the inner diameter of the acoustic tube, the interference of the cylindrical hydrophones in the very low frequency band is close to 2.28dB, and the interference in the high frequency band is up to 5dB. And the cylindrical hydrophone of the same size had greater interference to the sound field than the spherical hydrophone. The sensitivity uncertainty of the hydrophone after compensation is within 0.52dB, which meets the requirements of the calibration of the vibrating liquid column method.
2024 Vol. 45 (4): 565-572 [Abstract] ( 100 ) HTML (1 KB)  PDF (9195 KB)  ( 46 )
573 Study on Influencing Factors of Location Deviation of Sound Transmission Path in Anechoic Chamber Calibration
RUAN Zhangfeng,GU Chengcheng,CHEN Haiyong,DING Jijie,MENG Ziwei
DOI: 10.3969/j.issn.1000-1158.2024.04.17
Anechoic chamber acoustic measurement is an important means to measure the acoustic characteristics of products, and its performance directly affects the accuracy of relevant acoustic tests. The accuracy of measurement process is not only limited by theoretical calculation, but also affected by practical measurement process. Due to the dead weight of the sound transmitting device and the wire rope, the sound transmitting path is deformed from an ideal straight line to a curve, which affects the accuracy of the acoustic performance measurement. Therefore, it is particularly important to calibrate the sound transmission path of anechoic chamber. Finite element simulation focuses on the influence of rope length, tightness and inclination on the sound transmission path, verifies the accuracy of the simulation model through corresponding experiments, and studies the specific influence of different parameters on the sound transmission path through lateral comparison of parameters. Aiming at the study of parameters on the deviation of sound transmission path, a way for the calibration of sound transmission path error from multiple perspectives is provided, which is helpful to improve the accuracy of anechoic chamber measurement device and promote the development of high-precision automatic calibration system of anechoic chamber to a certain extent.
2024 Vol. 45 (4): 573-579 [Abstract] ( 87 ) HTML (1 KB)  PDF (8064 KB)  ( 68 )
580 Evaluation of Lithium-battery Conductive Slurry Dispersion byNuclear Magnetic Resonance Technology
ZHOU Ping,LUAN Zhenchao
DOI: 10.3969/j.issn.1000-1158.2024.04.18
The positive conductive slurries prepared by different types of conductive particles for lithium batteries are studied by using nuclear magnetic resonance (NMR) technology. By measuring the relaxation time and spectrum of the slurries, it is found that the relaxation time of carbon black slurry is negatively correlated with the BET value under the same grinding dispersion condition, and the relaxation spectrum of carbon black slurry is single-peak structure, indicating that carbon black is more easily dispersed. The relaxation spectra of carbon nanotube (CNT) slurry are all multi-modal, which indicates that the dispersion of CNT is poor. Further research results show that the larger the solid content of CNT slurry, the larger the specific surface area of the particles, the larger the relaxation time of the main peak of the relaxation spectrum, the lower the proportion of the main peak signal, indicating that the CNT is more prone to entanglement and aggregation in the solvent.
2024 Vol. 45 (4): 580-585 [Abstract] ( 97 ) HTML (1 KB)  PDF (3865 KB)  ( 181 )
586 The Fast Algorithm of Sine Wave Curve-fitting
LIANG Zhiguo
DOI: 10.3969/j.issn.1000-1158.2024.04.19
The running time of the four-parameter sine wave curve fitting software is studied, and a quantitative evaluation method of the software fitting time is proposed. The influence of the time used for the four-parameter sinusoidal curve fitting is quantitatively evaluated on the different factors and conditions such as the length of the sequence, the number of signal cycles contained in the sequence, the amplitude of the sine wave, the phase, the DC component, and the number of A/D bits, and the law of the fitting time varying versus each factor is obtained. Aiming at the main factors affecting the software running time, a fast fitting method is proposed to reduce the fitting time by reducing the length of the fitting sequence. They are direct sequence interception method and secondary sampling method. The validity and feasibility of the method are verified by a group of experiments, the conclusion is that the secondary sampling method is superior to the direct interception method. Both of them all can be used for fast calculation of four-parameter sine fitting.
2024 Vol. 45 (4): 586-593 [Abstract] ( 72 ) HTML (1 KB)  PDF (7195 KB)  ( 57 )
594 Impacts of Tissue-equivalent Liquid Properties onSAR and the Correction Model
ZHOU Xin,LI Anxiang,PANG Xinhua,DOU Lilan,TANG Wei,SHEN Qingfei,WU Tong
DOI: 10.3969/j.issn.1000-1158.2024.04.20
To determine a correction model that can be used to correct the measured specific absorption rate (SAR) in a homogeneous phantom when its dielectric properties deviates from standardized target values. The correction model is established based on the method of electromagnetic numerical simulation. The method is verified by comparison with the data in the IEC 62209＼IEEE 1528 standards at 835MHz. Based on the method, correction models at 3.5 and 28GHz, which are the candidate bands for the future communication systems, are proposed. Employing the correction models reduces the SAR measurement uncertainty, thereby improving the reproducibility of SAR compliance assessment between laboratories. Another benefit is that it enables the use of broadband tissue-equivalent liquids, whose dielectric parameters are not currently within the tight tolerances of existing standards. The use of broadband liquids reduces the cost of SAR measurement.
2024 Vol. 45 (4): 594-599 [Abstract] ( 99 ) HTML (1 KB)  PDF (3857 KB)  ( 52 )
600 Dynamic Prediction of NOx Concentration Based on Dung Beetle Optimization Ensemble Weighted Fusion
JIN Xiuzhang,CHANG Han,ZHAO Dayong,ZHAO Shushan
DOI: 10.3969/j.issn.1000-1158.2024.04.21
Aiming at the problem that a single prediction model for SCR inlet NOx concentration could not maintain prediction accuracy under different operating conditions, a dynamic model for predicting SCR inlet NOx concentration based on weighted fusion of Dung Beetle Optimizer (DBO) ensemble model was proposed. Firstly, a hybrid model of CatBoost and LightGBM was used to filter auxiliary variables while obtaining the delay time and order information of the auxiliary variables, and the input variables of the prediction model were determined based on the above information. Then, an integrated model consisting of LightGBM,XGBoost, and CatBoost was established, and the prediction results were weighted and fused using the dung beetle optimization algorithm. Finally, the DBO integrated weighted fusion dynamic prediction model was compared with three single models and the two weighted fusion prediction models optimized by the dung beetle algorithm. The evaluation indicators of the DBO integrated weighted fusion dynamic prediction model were superior to other models, with higher prediction accuracy, real-time performance, and adaptability, which could better meet the requirements of NOx concentration prediction under different working conditions.
2024 Vol. 45 (4): 600-608 [Abstract] ( 81 ) HTML (1 KB)  PDF (3110 KB)  ( 98 )
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