Iet Science Measurement & Technology最新文献

{"title":"A physical model for the calculation of the corona onset voltage gradient of AC spacers","authors":"Shilong Huang,&nbsp;Jie Mao,&nbsp;Xiaoliang Yan,&nbsp;Weiye Xue,&nbsp;Zhongyuan Zhang,&nbsp;Liang Xie,&nbsp;Yunpeng Liu","doi":"10.1049/smt2.12151","DOIUrl":"https://doi.org/10.1049/smt2.12151","url":null,"abstract":"<p>By correcting the photon area factor (PAF) to suit the structure of the spacer and redefining the effective ionization region of the process of negative corona onset, a physical model for the calculation of COG of AC spacers is established. The validity and practicability of the established physical model are validated by the corona onset test results of spacers in both low-altitude and high-altitude areas. The numerical results pertaining to PAF and effective ionization region are consistent with the theoretical analysis. With the established physical model as a basis, the COG of the spacer is calculated under different geometrical structure parameters and ambient conditions. The results imply that changing the curvature of the spacer edge has a more significant impact on the COG of the AC spacer than changing the curvature of the spacer end and thickness <i>H</i>. The decrease in the length of the ionization region and the rapid attenuation of spatial electric field intensity of the spacer with smaller geometric parameters lead to an increase in the COG.</p>","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"17 7","pages":"269-276"},"PeriodicalIF":1.4,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12151","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50144733","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}

{"title":"Rolling bearing fault diagnosis based on generalized multiscale mean permutation entropy and GWO-LSSVM","authors":"Li Liu,&nbsp;Zijin Liu,&nbsp;Xuefei Qian","doi":"10.1049/smt2.12149","DOIUrl":"https://doi.org/10.1049/smt2.12149","url":null,"abstract":"<p>Faults in rolling bearings are usually observed through pulses in the vibration signals. However, due to the influence of complex background noise and interference from other machine components present in measurement equipment, vibration signals are typically non-stationary and often contaminated by noise. Therefore, in order to effectively extract the random variation and non-linear dynamic variation characteristics of vibration signals, a new method of rolling bearing fault diagnosis based on generalized multiscale mean permutation entropy (GMMPE) and grey wolf optimized least squares support vector machine (GWO-LSSVM) is put forward in this paper. Based on the multiscale permutation entropy (MPE), the multiscale equalization is firstly used to replace the coarse grained process, and the value of mean is extended to variance to avoid the dynamic mutation of the original signal. Finally, the parameters of LSSVM are optimized by the grey wolf optimization algorithm to achieve accurate identification of fault modes. The results of simulation and experiment show that applying the proposed GMMPE to rolling bearing fault feature extraction is feasible and superior, and the method based on GMMPE and GWO-LSSVM has better noise robustness, which can effectively achieve rolling bearing fault diagnosis.</p>","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"17 6","pages":"243-256"},"PeriodicalIF":1.4,"publicationDate":"2023-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12149","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50124803","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}

{"title":"Influence of non-ideal line-reflect-match calibration standards on vector network analyzer S-parameter measurements","authors":"Wei Zhao,&nbsp;Chunyue Cheng,&nbsp;Chao Yang,&nbsp;Jiankang Xiao,&nbsp;Yibang Wang,&nbsp;Ye Huo","doi":"10.1049/smt2.12150","DOIUrl":"https://doi.org/10.1049/smt2.12150","url":null,"abstract":"<p>In this paper, an improved two-step method is presented for the sensitivity analysis of vector network analyzer (VNA) S-parameter measurements due to the non-ideal line-reflect-match (LRM) calibration standards. This improved method is based on the indirect uncertainty propagation mechanism, which is especially suitable for the S-parameter measurements applying the self-calibration technique. To further simplify the formula derivation, the deviation matrices [<i>δA</i>] and [<i>δB</i>] are newly defined to represent the uncertainties of the T-matrices of error boxes. With this definition, formulas for the deviations of device under test (DUT) S-parameters can be concluded as functions of [<i>δA</i>] and [<i>δB</i>] in a concise form. Eventually, by solving only three linear combinations of the elements from [<i>δA</i>] and [<i>δB</i>], the sensitivity coefficients of DUT S-parameters due to non-ideal LRM can be conveniently deduced in an analytical form. Finally, experiments are performed to verify the proposed method.</p>","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"17 6","pages":"257-268"},"PeriodicalIF":1.4,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12150","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50118305","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}

{"title":"Partial discharge signal compression reconstruction method based on transfer sparse representation and dual residual ratio threshold","authors":"Shice Zhao,&nbsp;Hongshan Zhao,&nbsp;Ma Libo,&nbsp;Qu Yuehan,&nbsp;Ren Hui","doi":"10.1049/smt2.12148","DOIUrl":"https://doi.org/10.1049/smt2.12148","url":null,"abstract":"<p>Partial discharge (PD) signals have a large amount of data and a low energy proportion of pulse signals, resulting in difficult data transmission and poor reconstruction efficiency. To this end, a PD signal compression reconstruction method based on transfer sparse representation and dual residual ratio threshold (TSR-DRRT) is proposed. TSR-DRRT is centred on the sparse representation (SR) and accurate reconstruction of noisy signals. The intrinsic pulse of PD signals is extracted by signal decomposition, and jointly trained with different types of signals to establish the transfer SR dictionary. The compressed signal accurately retains the essential characteristics of the pulse information by improving the match between the dictionary atoms and the polymorphic PD pulses. To match the transfer SR dictionary, the inner and outer DRRT iteration termination conditions are set adaptively during the reconstruction process based on the correlation difference between the dictionary and signal frames. Independent control of PD pulse recognition and reconstruction accuracy is achieved, and its performance under noisy signals is improved. The results show that the method can achieve high ratio compression and efficient reconstruction of noisy signals. Different types of PD signals can also have high matching accuracy. This method can meet the demand for PD signals compression and transmission to the terminal for accurate reconstruction.</p>","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"17 6","pages":"230-242"},"PeriodicalIF":1.4,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12148","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50155311","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}

{"title":"Study on characteristics gases of metal protrusions partial discharge in 10-kV air-insulated switchgear","authors":"Qipeng Tan,&nbsp;Bin Song,&nbsp;Linong Wang,&nbsp;Shaocheng Wu","doi":"10.1049/smt2.12147","DOIUrl":"https://doi.org/10.1049/smt2.12147","url":null,"abstract":"<p>Air-insulated switchgear plays an important role in distribution network and partial discharge (PD) is one of the common faults in its operation. The method of gas component analysis, which is to detect chemical gas products, is a novel one to discover PD. In order to study the feasibility of the method, the monitoring experiment of characteristic gases, comprising carbon monoxide (CO), nitrogen dioxide (NO₂), and ozone (O₃), of metal protrusion PD is carried out. This paper conducts the comparative experiments on three main factors affecting PD: voltage, air humidity and degree of protrusion, as well as studies how they affect the formation of characteristic gases. According to the experimental result, higher applied voltage promotes the formation of characteristic gases in the same conditions. In addition, with the increase of humidity from 40% to 75%, the generation of gases is inhibited. Furthermore, when the needle–plate distance is 30 mm, the gas concentration has almost no change within 6 h, which is different from that of 10 mm. In conclusion, the difference in gases concentration reveals the influence of three main factors on the generation of characteristic gases and provides an analytical basis for PD detection by gas composition analysis.</p>","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"17 6","pages":"221-229"},"PeriodicalIF":1.4,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12147","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50141945","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}

{"title":"Corrigendum to ‘A hierarchical diagnosis method of cable aged segment based on transfer function’","authors":"","doi":"10.1049/smt2.12146","DOIUrl":"https://doi.org/10.1049/smt2.12146","url":null,"abstract":"<p>Hong-shan, Z., Xiao-mei, G., Li-bo, M., Yan, W., Cheng-yan, S., Jie-ying, C.: A hierarchical diagnosis method of cable aged segment based on transfer function. IET Sci. Meas. Technol. 16, 512– 522 (2022). https://doi.org/10.1049/smt2.12125</p><p>In Section 0 Introduction, we missed an important reference ‘Wu Y , Zhang P , Lu G . Detection and location of aged cable segment in underground power distribution system using deep learning approach. IEEE Transactions on Industrial Informatics, 2021, 17(11):7379-7389.’ because of our mistakes. The code in this paper is developed based on the reference and we further make hierarchical diagnosis and consider the influence of cable joints to improve the sensitivity and accuracy of cable aging diagnosis.</p><p>We apologize for this error.</p>","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"17 5","pages":"220"},"PeriodicalIF":1.4,"publicationDate":"2023-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12146","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50124436","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}

{"title":"Response to corrigendum for ‘Adaptive dynamic surface control of a two-axis gimbal system’","authors":"","doi":"10.1049/smt2.12144","DOIUrl":"https://doi.org/10.1049/smt2.12144","url":null,"abstract":"","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"17 7","pages":"287-288"},"PeriodicalIF":1.4,"publicationDate":"2023-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12144","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50131421","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}

{"title":"Corrigendum: ‘Adaptive dynamic surface control of a two-axis gimbal system’","authors":"Mohammad Fathi,&nbsp;Hossein Bolandi","doi":"10.1049/smt2.12142","DOIUrl":"https://doi.org/10.1049/smt2.12142","url":null,"abstract":"<p>An adaptive Dynamic Surface Controller (DSC) is designed for a two-axis gimbal system with actuator dynamics in the presence of parametric uncertainties in [1]. A Lyapunov stability analysis is used to guarantee the convergence of the tracking error to the origin and boundedness of all closed-loop signals. The main objective of this corrigendum is to point out several errors that occurred throughout the paper, resulting in the inaccuracy of the used dynamic model and ineffectiveness of the proposed controller. It should be noted that taking into account the corrections stated in this corrigendum, the main result of the original paper is still valid.</p>","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"17 7","pages":"289-296"},"PeriodicalIF":1.4,"publicationDate":"2023-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12142","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50140086","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}

{"title":"Research on the evaluation of rectal function after LAR based on CEEMDAN-Fast-ICA algorithm","authors":"Peng Zan,&nbsp;Yutong Zhao,&nbsp;Hua Zhong,&nbsp;Yang Yu,&nbsp;Yuanbo Wang,&nbsp;Yijia Shao,&nbsp;Chunyong Li","doi":"10.1049/smt2.12140","DOIUrl":"https://doi.org/10.1049/smt2.12140","url":null,"abstract":"<p>Rectal cancer is one of the most common lower gastrointestinal diseases worldwide. Currently, the common treatment is low anterior resection (LAR) of the rectum, which preserves the anus of the patient. However, it is easy to cause low anterior resection syndrome after surgery, which has a significant negative impact on the life of patients, and there is no unified evaluation standard for postoperative rectal function. To solve this problem, a multi-sensor fusion rectal information acquisition system is designed in this paper, and a rectal signal processing method is proposed to theoretically evaluate the rectal function of postoperative patients. The method uses the complete ensemble empirical mode decomposition with adaptive noise (CEEMDAN) to decompose the one-dimensional rectal signal to solve the underdetermined ICA problem, uses the Fast independent component analysis (Fast-ICA) to separate the pure rectal signal, uses the wavelet packet to extract features, and uses the particle swarm optimization optimizes support vector machine (PSO-SVM) to classify and evaluate postoperative function. According to the experimental results, the rectal signal preprocessing effect is good, the evaluation prediction rate is 99.5565%, and the algorithm classification results are accurate, which provides a certain preliminary theoretical basis and reference value for the evaluation of rectal function after LAR.</p>","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"17 4","pages":"167-182"},"PeriodicalIF":1.4,"publicationDate":"2023-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12140","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50125845","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}

{"title":"Unmanned ground vehicle-unmanned aerial vehicle relative navigation robust adaptive localization algorithm","authors":"Jun Dai,&nbsp;Songlin Liu,&nbsp;Hao Xiangyang,&nbsp;Zongbin Ren,&nbsp;Xiao Yang,&nbsp;Yunzhu Lv","doi":"10.1049/smt2.12141","DOIUrl":"https://doi.org/10.1049/smt2.12141","url":null,"abstract":"<p>The unmanned aerial vehicle (UAV) and the unmanned ground vehicle (UGV) can complete complex tasks through information sharing and ensure the mission execution capability of multiple unmanned carrier platforms. At the same time, cooperative navigation can use the information interaction between multi-platform sensors to improve the relative navigation and positioning accuracy of the entire system. Aiming at the problem of deviation of the system model due to gross errors in sensor measurement data or strong manoeuvrability in complex environments, a robust and adaptive UGV-UAV relative navigation and positioning algorithm is proposed. In this paper, the relative navigation and positioning of UGV-UAV is studied based on inertial measurement unit (IMU)/Vision. Based on analyzing the relative kinematics model and sensor measurement model, a leader (UGV)-follow (UAV) relative navigation model is established. In the implementation of the relative navigation and positioning algorithm, the robust adaptive algorithm and the non-linear Kalman filter (extended Kalman filter [EKF]) algorithm are combined to dynamically adjust the system state parameters. Finally, a mathematical simulation of the accompanying and landing process in the UGV-UAV cooperative scene is carried out. The relative position, velocity and attitude errors calculated by EKF, Robust-EKF and Robust-Adaptive-EKF algorithms are compared and analyzed by simulating two cases where the noise obeys the Gaussian distribution and the non-Gaussian distribution. The results show that under the non-Gaussian distribution conditions, the accuracy of the Robust-Adaptive-EKF algorithm is improved by about two to three times compared with the EKF and Robust-EKF and can almost reach the relative navigation accuracy under the Gaussian distribution conditions. The robust self-adaptive relative navigation and positioning algorithm proposed in this paper has strong adaptability to the uncertainty and deviation of system modelling in complex environments, with higher accuracy and stronger robustness.</p>","PeriodicalId":54999,"journal":{"name":"Iet Science Measurement & Technology","volume":"17 5","pages":"183-194"},"PeriodicalIF":1.4,"publicationDate":"2023-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/smt2.12141","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50125859","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}