Iet Science Measurement & Technology最新文献_第7页

Development of low-cost leaf spectroscopy based on featured wavelength extraction by fix-bandwidth Gaussian mixture model 基于固定带宽高斯混合模型特征波长提取的低成本叶片光谱研究

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2023-01-03 DOI: 10.1049/smt2.12139

Xingming Long, Ruoshuang Zhang, Jing Zhou

{"title":"Development of low-cost leaf spectroscopy based on featured wavelength extraction by fix-bandwidth Gaussian mixture model","authors":"Xingming Long, Ruoshuang Zhang, Jing Zhou","doi":"10.1049/smt2.12139","DOIUrl":"https://doi.org/10.1049/smt2.12139","url":null,"abstract":"Light spectrum analysis of leaves plays an essential role in measuring the contents of carbohydrates and other important compound like proteins. And it is also useful in evaluating the status of vegetation by remote sensing. Here, an approximation method considering the optical response characteristics of multispectral silicon (Si) sensor for the reflection or absorption spectra of leaves is proposed. The light spectrum is analysed by Gaussian mixture models (GMM) with fixed bandwidth firstly, and then the optimal model parameters are derived and validated to balance the complexity of Si sensor and the 2-norm deviation of spectra, and next a low-cost framework for the leaf spectroscopy with wireless node is illustrated according to the specific centre-wavelengths and bandwidths of the GMM, and finally, an experimental prototype with 18-channel Si sensor node and the developed mobile APP is demonstrated. The simplified strategy and its realization for leaf spectroscopy cast light on large-scale applications in future agriculture.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12139","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50124291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bubble migration characteristics in power transformer oil under coupled stresses of forced vibration and electrical field 强迫振动和电场耦合应力作用下电力变压器油中气泡迁移特性

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-12-31 DOI: 10.1049/smt2.12136

Niyomugabo Emmanuel Ladislas, Qingmin Li, Qiushi Liu, Wu Jie, Huang Weimin

{"title":"Bubble migration characteristics in power transformer oil under coupled stresses of forced vibration and electrical field","authors":"Niyomugabo Emmanuel Ladislas, Qingmin Li, Qiushi Liu, Wu Jie, Huang Weimin","doi":"10.1049/smt2.12136","DOIUrl":"https://doi.org/10.1049/smt2.12136","url":null,"abstract":"The stresses existing in power transformers lead to the generation of bubbles. They are the primary source that worsens and leads to insulation failure. Due to the complexity of bubble dynamics, it is challenging to figure out bubble mechanisms. However, creation, migration, and accumulation mechanisms require further explanation. A set of experiments has been conducted to provide a scientific overview of bubbles. The results revealed that buoyancy is dominant in low electric fields, while high electric fields affect bubbles' rise. Bubbles stretch and oscillate while moving. When the electric field is not strong, the AC field reduces the duration and volume of bubble detachment. Vibration stress on the other side is leading the bubble motion including detachment frequency and migration speed. Under the combination of AC and vibration stresses, the bubble distortion degree aggravates and bubble gathering formation is easy. This research can provide a deeper acumen of the bubble's actions beneath a power transformer under a combination of vibration and electric fields. It provides essential technique parameters to deal with while investigating bubble's problems and related engineering research areas.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12136","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50156045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Novel denoizing method for partial discharge signals using singular value decomposition and spectral subtraction 基于奇异值分解和谱相减的局部放电信号去噪新方法

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-11-26 DOI: 10.1049/smt2.12134

Yifan Xu, Yan Jing, Yanxin Wang, Ruixin He, Jianhua Wang, Yingsan Geng

{"title":"Novel denoizing method for partial discharge signals using singular value decomposition and spectral subtraction","authors":"Yifan Xu, Yan Jing, Yanxin Wang, Ruixin He, Jianhua Wang, Yingsan Geng","doi":"10.1049/smt2.12134","DOIUrl":"https://doi.org/10.1049/smt2.12134","url":null,"abstract":"Partial discharge (PD) detection is essential in assessing the insulation state of electrical equipment. However, PD signals are often overwhelmed by interference, resulting in inaccurate detection results. Aiming at this problem, this study proposes a PD detection method based on singular value decomposition (SVD) and improved spectral subtraction. First, the test signal is constructed as a Hankel matrix, which is used as a trajectory matrix for the SVD. Next, the singular value mutation point in the feature matrix is set as the threshold for removing the narrowband interference (NBI), and a signal containing only white noise is obtained. Finally, the improved spectral subtraction is used to remove white noise and improve the signal-to-noise ratio (SNR). The method proposed herein, along with the variational mode decomposition, the empirical mode decomposition, and the improved threshold wavelet method, are applied to the processing of PD signals. Also, the SNR value, waveform similarity coefficient, and mean square error of the denoizing signal of the four algorithms were calculated, considering the noise suppression and feature preservation abilities. The simulation and measurement results show that the SVD-spectral subtraction method has a strong suppression effect on narrow-band interference and white noise. Compared with other algorithms, this method can significantly improve the execution efficiency and has great application prospects.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12134","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50144991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Research on 3D reconstruction technology of large-scale substation equipment based on NeRF 基于NeRF的大型变电站设备三维重建技术研究

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-11-26 DOI: 10.1049/smt2.12131

Shaotong Pei, Rui Yang, Yunpeng Liu, Wenxuan Xu, Gonghao Zhang

引用次数: 0

Lightning inductive coupling characteristics of parallel cables: Computation and measurement validation 并联电缆的雷电感应耦合特性：计算和测量验证

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-11-24 DOI: 10.1049/smt2.12135

Mi Zhou, Weihan Zhao, Shengquan Zheng, Yongming Guo, Zehong Yang, Jianguo Wang, Li Cai, Yadong Fan

{"title":"Lightning inductive coupling characteristics of parallel cables: Computation and measurement validation","authors":"Mi Zhou, Weihan Zhao, Shengquan Zheng, Yongming Guo, Zehong Yang, Jianguo Wang, Li Cai, Yadong Fan","doi":"10.1049/smt2.12135","DOIUrl":"https://doi.org/10.1049/smt2.12135","url":null,"abstract":"A simulation model composed of an interfering cable and a disturbed cable is established for studying the lightning inductive characteristics between parallel cables. Effects of the horizontal distance between cables (5–40 cm), their height difference (−6–32 cm), as well as the length of disturbed cable (1–100 m) are investigated for the cable induced voltage, which is measured at the resistive load connected between one terminal of the disturbed cable and the ground, when various lightning surge currents (8/20 μs, 5/320 μs, and 0.5 μs/100 kHz) are delivered into the interfering cable. Our findings show that an increase of horizontal distance between cables can give rise to an exponential decrease of the cable induced voltage, and that there exist linear correlations between either the height difference of two cables or the length of disturbed cable and the cable induced voltage, which reaches maximum when the cables are located at the same height and of equal length. Verification experiments for the effect of horizontal distance have also been made, and, in general, they all show a reasonable agreement with the simulations. A detailed theoretical explanation of obtained findings is provided as well.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12135","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50154045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Electricity theft detection method based on multi-domain feature fusion 基于多域特征融合的窃电检测方法

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-11-22 DOI: 10.1049/smt2.12133

Hong-shan Zhao, Cheng-yan Sun, Li-bo Ma, Yang Xue, Xiao-mei Guo, Jie-ying Chang

{"title":"Electricity theft detection method based on multi-domain feature fusion","authors":"Hong-shan Zhao, Cheng-yan Sun, Li-bo Ma, Yang Xue, Xiao-mei Guo, Jie-ying Chang","doi":"10.1049/smt2.12133","DOIUrl":"https://doi.org/10.1049/smt2.12133","url":null,"abstract":"To solve the problem of low accuracy of the previous electricity theft detection methods, the authors propose a multi-domain feature (MDF) fusion electricity theft detection method based on improved tensor fusion (ITF). Firstly, the original electricity consumption series is transformed by gram angle field (GAF) to obtain the time-domain matrix. The original electricity consumption series is converted into frequency-domain by Maximal Overlap Discrete Wavelet Transform (MODWT) to obtain the frequency-domain matrix. Then, the convolutional neural networks (CNN) are used to extract features of the time-domain matrix and frequency-domain matrix, respectively. Next, in order to fuse single-domain feature information and MDF interaction information while reducing redundant information, the authors propose an ITF method to obtain a multi-domain fusion tensor. Finally, the multi-domain fusion tensor is input into the electricity theft inference module to judge whether the user implements electricity theft behaviour. The authors simulate six electricity theft types and evaluate the method's performance separately for each electricity theft type. The results show that the proposed method outperforms other methods.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12133","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50141389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design and analysis of a magnetic connection device for external ventricular drain 心室外引流磁连接装置的设计与分析

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-11-22 DOI: 10.1049/smt2.12132

Rongguo Yan, Junjun Ye, Jiahui Wang, Maomao Wang

{"title":"Design and analysis of a magnetic connection device for external ventricular drain","authors":"Rongguo Yan, Junjun Ye, Jiahui Wang, Maomao Wang","doi":"10.1049/smt2.12132","DOIUrl":"https://doi.org/10.1049/smt2.12132","url":null,"abstract":"It is difficult to separate Luer lock adapters during the external ventricular drainage (EVD) since they are often connected by a threaded connection, and the infusion needle put into the patient's body gets pulled out when extubation occurs unexpectedly. The paper described a new magnetic connection assembly made up of ring magnetic permanents and a Hall sensor that could be used to replace Luer lock adapters for quicker disconnection and reconnection of the drainage catheter. For the design and analysis of the device, the finite element method magnetics (FEMM) was used to estimate the size of magnetic permanents and the best detection site of the Hall sensor for detecting whether the magnetic permanents were closely attracted and/or pulled apart. Then an experiment was conducted to confirm our findings. Both simulation and experiment revealed that a pair of hollow cylindrical magnetic permanents, each with height 10 mm, outer diameter 8 mm, and inner diameter 4 mm, could achieve the same force as the Luer lock adapters held, and that the best Hall sensor detection position was in the middle of the permanent magnets, with a radial distance of about 2 mm.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12132","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50141565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A novel fault diagnosis method of power cable based on convolutional probabilistic neural network with discrete wavelet transform and symmetrized dot pattern 基于离散小波变换和对称点阵卷积概率神经网络的电力电缆故障诊断新方法

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-11-05 DOI: 10.1049/smt2.12130

Hong-Wei Sian, Cheng-Chien Kuo, Shiue- Der Lu, Meng-Hui Wang

{"title":"A novel fault diagnosis method of power cable based on convolutional probabilistic neural network with discrete wavelet transform and symmetrized dot pattern","authors":"Hong-Wei Sian, Cheng-Chien Kuo, Shiue- Der Lu, Meng-Hui Wang","doi":"10.1049/smt2.12130","DOIUrl":"https://doi.org/10.1049/smt2.12130","url":null,"abstract":"To accurately diagnose the XLPE power cable insulation fault, this research proposed a novel hybrid algorithm combined with Convolutional Probabilistic Neural Network (CPNN) based on Discrete Wavelet Transform (DWT) and Symmetrized Dot Pattern (SDP) analysis. First, it built seven different power cable insulation defect models to measure partial discharge signals of power cable insulation faults. Then, a discrete wavelet transform was used for noise filtering. The time-domain partial discharge signal was directly converted into the point coordinate feature image of visual polar coordinates by SDP analyses. Finally, the feature image was trained and recognized by CPNN. After the important feature information of the feature-image was extracted by convolution layer and pooling layer operations, it is applied to the power cable insulation fault state diagnosis system based on the rapid learning and highly parallel computing of Probabilistic Neural Network (PNN). The experimental results proved that the method proposed in this research could accurately diagnose the power cable insulation fault type and the recognition accuracy is higher than 96%. The proposed method has a short detection time and high diagnostic accuracy. This proves that it can be applied to detect the power cable insulation fault type.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12130","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50131898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Improvement of partial discharge resistance of polypropylene under AC voltage by blending elastomer 共混弹性体提高聚丙烯在交流电压下的局部放电电阻

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-10-20 DOI: 10.1049/smt2.12129

Yu Gao, Jinjing Peng, Jing Li, Zheng Song, Xuri Xu, Tao Han, Meng Xiao

{"title":"Improvement of partial discharge resistance of polypropylene under AC voltage by blending elastomer","authors":"Yu Gao, Jinjing Peng, Jing Li, Zheng Song, Xuri Xu, Tao Han, Meng Xiao","doi":"10.1049/smt2.12129","DOIUrl":"https://doi.org/10.1049/smt2.12129","url":null,"abstract":"This paper reports on the partial discharge (PD) erosion characteristics of polypropylene (PP)/elastomer blends where ethylene-octene copolymer elastomer (EOC) and propylene-based elastomer are involved. The PD erosion is performed through a pair of needle-to-plane electrodes by applying 5 kV AC voltage for 2 h. A high-frequency current transformer, optical recorder, and ozone sensor are used to capture the information released during the PD erosion process. In addition, a 3D optical profilometer is employed to record the erosion profile, from which the erosion depth and the surface roughness can be extracted. Carrier trap distribution is derived from the isothermal surface potential decay measurement. The influences of elastomer type and content on the PD resistance are analyzed. The results show that the resistance is improved with the addition of elastomer, and the blend containing EOC of 20 wt% has the best PD resistance among all samples, which is 61.9% higher than that of the pure PP. It is proposed that the carrier trap characteristics, the property of elastomer, and the free volume in the material play important roles in the improvement of the PD resistance. This work provides a potential method to enhance the PD resistance of PP by blending elastomer with proper type and content.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12129","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50139234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multiple objective optimisation for antenna diversity on airborne platforms 机载平台天线分集的多目标优化

IF 1.4 4区工程技术

Iet Science Measurement & Technology Pub Date : 2022-10-11 DOI: 10.1049/smt2.12115

Christian B. Emmett, James A. Flint, Robert D. Seager

{"title":"Multiple objective optimisation for antenna diversity on airborne platforms","authors":"Christian B. Emmett, James A. Flint, Robert D. Seager","doi":"10.1049/smt2.12115","DOIUrl":"https://doi.org/10.1049/smt2.12115","url":null,"abstract":"Vehicles such as automobiles, ships, satellites, and aircraft have a limited amount of physical space to install antennas for communications and navigation systems. This is exacerbated by the use of modern materials, like carbon fibre, and that large areas of the vehicles structure cannot be used to mount antenna, due to aerodynamic or other requirements. Therefore, it is necessary to be able to quickly and accurately find the optimum locations to mount a number of antenna systems, in a restricted space, whilst considering a number of different and sometimes contradictory antenna performance parameters. Thus, defining the optimum antenna locations is a multi-objective problem (MOP) and lends itself to the use of multi-objective evolutionary algorithms (MOEA). This paper presents a MOEA methodology that can be used to accurately, quickly, and robustly define the antenna locations. It will also define an appropriate MOEA and the fitness functions for predicting the radio frequency (RF) interoperability/mutual coupling between antenna systems and antenna RF radiation pattern installed performance.","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12115","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50138703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0