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Study on surface fitting algorithm applied in manufacturing of CFETR VV

FUSION ENGINEERING AND DESIGN 2021年 170卷 112689-112689页

作者： Fan, Xiaosong Gu, Yongqi Ji, Haibiao Zheng, Yuanyang Liu, Zhihong Wu, Jiefeng Ma, Jianguo Huainan New Energy Res Ctr Anhui Prov Key Lab Special Welding Technol Huainan 232063 Peoples R China Chinese Acad Sci Inst Plasma Phys Hefei 230031 Peoples R China Shenzhen Univ Coll Engn Key Lab Optoelectron Device & Syst Minist Educ & Guangdong Prov Shenzhen 518060 Peoples R China Shenzhen Univ Adv Energy Res Ctr Shenzhen 518060 Peoples R China

During the manufacturing process of China Fusion Engineering Test Reactor vacuum vessel mock-up, the dimensional accuracy and the contour accuracy of the vacuum vessel decrease inevitably due to manufacturing and assembly errors. To solve this problem, measuring and fitting method is used and new reference points are established. For nonuniform distribution of deviations caused by the asymmetric structure of the vacuum vessel sector, least square algorithm is improved by introducing weight factors from the least squares method. With the improved fitting algorithm, the error distributions of simulation results and deviations after fitting of the 1/32 vacuum vessel sector become more even, and the error maximums are reduced. Results show that measuring and fitting method with improved algorithm is effective in improving the manufacturing errors of vacuum vessel sectors and can be used as a reference for manufacturing of other vacuum vessels.

关键词： CFETR VV Measuring and fitting method Weight factor fitting algorithm

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Measurement of Temperature Dependence Complex Permittivity Based on fitting algorithm of Terminal short circuit

Measurement of Temperature Dependence Complex Permittivity B...

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International Applied-Computational-Electromagnetics-Society Symposium - China (ACES)

作者： Li, Qiangqiang Li, Hongliang Liu, Dawei Bai, Ming Beihang Univ Microwave Engn Lab Beijing 100083 Peoples R China

ISBN: (纸本)9780996007849

Aiming at the measurement of temperature dependence complex permittivity of low loss material, a new fitting algorithm is designed based on terminal short circuit method. The calculation process is simpler and remain accuracy. At the same time the temperature dependence test system is designed and built in this paper. The accuracy of the algorithm and the system is verified. The results show that the complex permittivity of low loss materials can be accurately measured from room temperature to 250 degrees C under the wide band.

关键词： low loss material Complex permittivity high temperature terminal short circuit fitting algorithm

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High-precision Resistance Calibrator Error Compensation Method Research Based on fitting algorithm 12

High-precision Resistance Calibrator Error Compensation Meth...

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12th IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Yang, Chunling Yu, Jiajian Zhu, Min Harbin Inst Technol Sch Elect Engn & Automat Harbin Heilongjiang Peoples R China

ISBN: (纸本)9781509061617

In the design of high-precision resistance calibrator, using the fitting algorithm to fit the resistance control curve is an important method of error compensation. The interpolation method and the approximation method are commonly used in the fitting algorithm. However, there exist overmuch test points and noise problems in the high accuracy resistance calibrator, which leads to the problem of low accuracy of interpolation and approximation. In order to realize accurately fitting, a fitting algorithm based on least squares approximation was used to fit the curve. The results show that the proposed algorithm can be applied to the error correction of the resistance calibrator, which greatly improves its accuracy.

关键词： fitting algorithm high-precision resistance calibration error compensation

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Analysis of Surface Plasmon Resonance Curves with a Novel Sigmoid-Asymmetric fitting algorithm

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SENSORS 2015年第10期15卷 25385-25398页

作者： Jang, Daeho Chae, Geunhyoung Shin, Sehyun Korea Univ Sch Mech Engn Seoul 136701 South Korea Sungkyunkwan Univ Coll Informat & Commun Engn Suwon 440476 South Korea

The present study introduces a novel curve-fitting algorithm for surface plasmon resonance (SPR) curves using a self-constructed, wedge-shaped beam type angular interrogation SPR spectroscopy technique. Previous fitting approaches such as asymmetric and polynomial equations are still unsatisfactory for analyzing full SPR curves and their use is limited to determining the resonance angle. In the present study, we developed a sigmoid-asymmetric equation that provides excellent curve-fitting for the whole SPR curve over a range of incident angles, including regions of the critical angle and resonance angle. Regardless of the bulk fluid type (i.e., water and air), the present sigmoid-asymmetric fitting exhibited nearly perfect matching with a full SPR curve, whereas the asymmetric and polynomial curve fitting methods did not. Because the present curve-fitting sigmoid-asymmetric equation can determine the critical angle as well as the resonance angle, the undesired effect caused by the bulk fluid refractive index was excluded by subtracting the critical angle from the resonance angle in real time. In conclusion, the proposed sigmoid-asymmetric curve-fitting algorithm for SPR curves is widely applicable to various SPR measurements, while excluding the effect of bulk fluids on the sensing layer.

关键词： surface plasmon resonance fitting algorithm sigmoid-asymmetric critical angle resonance angle

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The cascaded steady-state lumped parameter circuits for describing resonance characteristics of transmission lines

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ELECTRIC POWER SYSTEMS RESEARCH 2025年 241卷

作者： Sun, Xing Lei, Wanjun Hu, Linqiang Zhang, Xiaotong Li, Lei Xi An Jiao Tong Univ Sch Elect Engn State Key Lab Elect Insulat & Power Equipment Xian 710000 Peoples R China

This paper proposes a determination method for cascaded lumped parameter circuits (LPCs) to describe steadystate resonance characteristics of transmission lines, with a focus on the cascaded number. The physical simulation of long-distance transmission lines is achieved by cascaded LPCs. The existing methods for determining the cascaded number are applicable to transient-state operating conditions. The LPC with a cascaded number adequate for transient-state needs causes misjudgment in physical simulation. The number is determined by simulation and is limited by computational simulation software tools. This paper proposes a fitting participation factor (PF)-based method to determine the cascaded number. With the proposed method, the LPC and the transmission line have approximately proportional harmonic propagation distribution and harmonic voltage. Errors of resonance frequency and resonance center in the LPC are investigated based on numerical analysis and resonance mode analysis. The misjudgment in physical simulation is discussed through PF. Next, the general expression for the measuring impedance of the LPC is deducted. The applicable operating conditions and equivalent conditions for various LPCs are examined. In addition, the proposed method is independent of skin effect and suitable for lossy lines. The validity of the proposed method is verified by simulations.

关键词： Transmission lines Lumped parameter circuits Cascaded number Resonance characteristics fitting algorithm

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IDPMS: A New Integrated Dose-Position Measuring System for Ion Therapy

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IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 2025年 74卷

作者： Li, Juan Chen, Yucong Li, Weilong Liu, Xiaotao Xu, Zhiguo Luo, Faming Zhao, Zulong Kang, Xincai Mao, Ruishi Hu, Zhengguo Chinese Acad Sci Inst Modern Phys Lanzhou 730000 Gansu Peoples R China Lanzhou Univ Sch Informat Sci & Engn Lanzhou 730000 Gansu Peoples R China

For proton or carbon ion therapy, when using the point scanning method to control a pencil beam for treatment, rapid measurement of the position of each spot, the absorbed dose, and even the angle of incidence, as well as rapid feedback and interlocking signals, are necessary to ensure the accuracy of beam delivery. In this article, we present a new integrated dose-position measuring system (IDPMS) developed by the Institute of Modern Physics that is highly integrated and scalable, with fast measurement speed and no dead time. The system can rapidly measure the beam position and the relative absorbed dose. Optical ports can also synchronize the two systems to measure beam incidence angularity rapidly. A new Gaussian fitting algorithm has been developed on the field programmable gate array (FPGA) of this system, which has been tested by many beams and operated stably and reliably and can complete the Gaussian fitting within 4 mu s. In point scanning mode, the detector system can achieve a spot position measurement with a maximum deviation of 0.15 mm and generate a beam spot position interlock signal within 55 mu s. Using two ionization chambers (ICs) working in synchronization with a distance of more than 103 mm, the virtual source axis distance of similar to 7 m, the maximum deviation of the elevation angle is 0.03 degrees, and the maximum deviation of the azimuth angle is 1.38 degrees. The system's scalability and multiple modes of operation make it capable of meeting the beam monitoring needs of most current ion therapy devices and achieving machine quality assurance (QA). In addition, the system can also monitor the beam state in real-time in particle physics experiments, providing powerful technical support for scientific research and medical applications.

关键词： Monitoring Medical treatment Detectors Ions Position measurement Particle beam measurements fitting Accuracy Synchronization Particle measurements Beam incidence angle measure fitting algorithm ion therapy ionization chamber (IC) real-time dose-position measure

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Experimental and numerical insights on the CFRP propeller: comparative interlaminar mechanical simulation, and strain-time prediction with LSTM neural network

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OCEAN ENGINEERING 2025年 331卷

作者： Wang, Jinlong Shi, Zeyu Ji, Xiukun Wang, Depeng Bao, Yongjie Yang, Yuxing Dalian Maritime Univ Marine Engn Coll Dalian Peoples R China Dalian Maritime Univ Naval Architecture & Ocean Engn Coll Dalian Peoples R China Dalian Univ Technol Sch Mech Engn Dalian Peoples R China

The interlaminar mechanical characteristics and strain prediction method of carbon fibre-reinforced polymer propellers are key issues in practical engineering. Carbon Fiber Reinforced Polymer (CFRP) is a high-performance composite material composed of carbon fibers and a polymer matrix, abbreviated as CFRP in the article. In this study, the custom-designed CFRP propeller is taken as the research object. First, the detailed summary of CFRP propeller numerical modeling techniques with two lamination structures are provided, including cladding blade and symmetrical blade. Then, the mechanical tests and fluid-structure interaction numerical simulation are conducted to comparatively analyze and screening the mechanical characteristics of CFRP propeller blades with two lamination structural structures. The results reveal that the cladding blade exhibits superior stiffness and interlaminar stress distribution compared to the symmetrical blade, indicating better mechanical properties. Last, the cladding CFRP propeller is taken as the investigation subject for its better mechanical characteristic, and "an underwater test is conducted to explore the strain prediction method. Long-Short Term Memory is a special type of recurrent neural network, abbreviated as LSTM in the article. Based on the test results, LSTM neural network is employed to evaluate the strain of the cladding CFRP propeller during rotation, the coefficient of determination and error are all in acceptable range which proves that LSTM neural network is capable to fit the strain-time series data. The research on exploring interlaminar mechanical characteristic, developing the strain-time prediction with LSTM are of great significance to the application of CFRP propeller in the ocean engineering.

关键词： LSTM CFRP material Propeller fitting algorithm

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Automatic reorientation to generate short-axis myocardial PET images

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EJNMMI PHYSICS 2024年第1期11卷 70页

作者： Yang, Yuling Wang, Fanghu Han, Xu Xu, Hui Zhang, Yangmei Xu, Weiping Wang, Shuxia Lu, Lijun Southern Med Univ Sch Biomed Engn 1023 Shatai Rd Guangzhou 510515 Peoples R China Southern Med Univ Guangdong Prov Key Lab Med Image Proc 1023 Shatai Rd Guangzhou 510515 Peoples R China Southern Med Univ Guangdong Prov Peoples Hosp Guangdong Acad Med Sci PET CtrDept Nucl Med 106 Zhongshan Er Rd Guangzhou 510080 Peoples R China Univ Chinese Acad Sci Canc Hosp Zhejiang Canc Hosp Hangzhou Zhejiang Peoples R China Pazhou Lab Guangzhou 510515 Peoples R China

BackgroundAccurately redirecting reconstructed Positron emission tomography (PET) images into short-axis (SA) images shows great significance for subsequent clinical diagnosis. We developed a system for automatic redirection and quantitative analysis of myocardial PET *** total of 128 patients were enrolled for 18 F-FDG PET/CT myocardial metabolic images (MMIs), including 3 image classifications: without defects, with defects, and excess uptake. The automatic reorientation system includes five modules: regional division, myocardial segmentation, ellipsoid fitting, image rotation and quantitative analysis. First, the left ventricular geometry-based canny edge detection (LVG-CED) was developed and compared with the other 5 common region segmentation algorithms, the optimized partitioning was determined based on partition success rate. Then, 9 myocardial segmentation methods and 4 ellipsoid fitting methods were combined to derive 36 cross combinations for diagnostic performance in terms of Pearson correlation coefficient (PCC), Kendall correlation coefficient (KCC), Spearman correlation coefficient (SCC), and determination coefficient. Finally, the deflection angles were computed by ellipsoid fitting and the SA images were derived by affine transformation. Furthermore, the polar maps were used for quantitative analysis of SA images, and the redirection effects of 3 different image classifications were analyzed using correlation *** the dataset, LVG-CED outperformed other methods in the regional division module with a 100% success rate. In 36 cross combinations, PSO-FCM and LLS-SVD performed the best in terms of correlation coefficient. The linear results indicate that our algorithm (LVG-CED, PSO-FCM, and LLS-SVD) has good consistency with the reference manual method. In quantitative analysis, the similarities between our method and the reference manual method were higher than 96% at 17 segments. Moreover, our method demonstrated excellent

关键词： Positron emission tomography (PET) Automatic reorientation Regional division Image segmentation fitting algorithm

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Optimal design of FBG flexible sensor for high-precision monitoring of three-dimensional deformation of power transmission line tower foundation

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ENERGY REPORTS 2023年 9卷 46-54页

作者： Tian, Changbin Ma, Xin Ma, Xiangxue Peng, Bo Shandong Jianzhu Univ Sch Informat & Elect Engn 1000 Fengming Rd Jinan 250101 Peoples R China

During the operation of the power transmission line tower foundation, uneven settlement and horizontal sliding were formed due to the damage of the local environment or external force. It is the most direct and effective way to realize the transformation from "passive response " to "active prevention and control " by real-time and long-term monitoring of the tower foundation and providing automatic early warning. In this paper, based on FBG (fiber Bragg grating) sensing technology, a FBG flexible sensor with temperature self-compensation characteristic was developed, which can be used for real-time monitoring of three-dimensional deformation field of tower foundation. Based on the strain information measured by the sensor, a coordinate transformation fitting algorithm was applied to reconstruct the deformation field of the tower foundation. To improve the displacement sensing precision of the flexible sensor, the influence of the length of the cemented layer and the groove radius on the strain transfer coefficient was analyzed, and the orthogonal curvature obtained by the sensing point was corrected by cubic spline interpolation. In the displacement sensing experiment, the mean absolute errors along the x-axis direction after interpolation correction were 1.84 mm (Type 1), 1.52 mm (Type 2) and 1.96 mm (Type 3), respectively;the mean absolute errors along the y-axis direction were 1.64 mm (Type 1), 2.34 mm (Type 2) and 1.21 mm (Type 3), respectively. After interpolation correction, the maximum absolute error percentages of the measuring points along the x-axis were 9.62% (Type 1), 9.01% (Type2) and 10.23% (Type 3);the maximum absolute error percentages along the y-axis were 10.44% (Type 1), 9.53% (Type2) and 9.43% (Type 3). Therefore, the designed FBG flexible sensor can be competent for the task of monitoring the three-dimensional deformation field of the tower foundation, which has important significance and application promotion value.(c) 2022 The Author(s). Publi

关键词： Deformation monitoring FBG flexible sensor fitting algorithm Sensing precision Cubic spline interpolation

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QPA: A Quantization-Aware Piecewise Polynomial Approximation Methodology for Hardware-Efficient Implementations

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IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS 2023年第7期31卷 931-944页

作者： Geng, Haoran Chen, Xiaoliang Zhao, Ning Du, Yuan Du, Li Nanjing Univ Sch Elect Sci & Engn Nanjing 210023 Peoples R China

Piecewise polynomial approximation (PPA) on nonlinear functions plays an important role in high-precision computing. In this article, we proposed QPA, an integration of error-flattened quantization-aware PPA methods, to generate the optimized coefficients for efficient hardware implementations targeting any polynomial order. QPA incorporated four key features to minimize the fitting error and the hardware cost, including using the Remez algorithm to compute the minimax fitting polynomial, combining the fitting and quantization operations to get an error-flattened characteristic, assigning specific coefficient bit width to each multiplier to reduce the hardware cost, and fine-tuning the truncated coefficients to further reduce the fitting error. Experimental results showed that our methods consistently achieved the lowest fitting error compared with the state-of-the-art error-flattened piecewise approximation methods. We synthesized the proposed designs with 28-nm TSMC CMOS technology. The results showed that the proposed designs achieved up to 37.0% area reduction and 50.5% power consumption reduction compared to the state-of-the-art error-flattened piecewise linear (PWL) method, and up to 27.0% area reduction, 21.4% delay reduction, and 20.8% power consumption reduction compared to the state-of-the-art error-flattened piecewise quadratic (PWQ) method.

关键词： fitting Hardware Approximation algorithms Table lookup Partitioning algorithms Adders Very large scale integration Approximate computing error-flattened fine-tuning rounding fitting algorithm piecewise polynomial approximation (PPA) prequantization Remez algorithm VLSI architecture

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