Journal of Electrostatics最新文献

Uniform electric-field optimal design method using machine learning 利用机器学习的均匀电场优化设计方法

IF 1.9 4区工程技术

Journal of Electrostatics Pub Date : 2024-11-06 DOI: 10.1016/j.elstat.2024.103990

Zipeng Cheng, Qizheng Ye, Xiaofei Nie, Chengye Li, Wenhua Wu

{"title":"Uniform electric-field optimal design method using machine learning","authors":"Zipeng Cheng, Qizheng Ye, Xiaofei Nie, Chengye Li, Wenhua Wu","doi":"10.1016/j.elstat.2024.103990","DOIUrl":"10.1016/j.elstat.2024.103990","url":null,"abstract":"<div><div>The demand for uniform electric fields (UEFs) in engineering is very high, particularly in high-voltage devices. The existing methods encounter limitations in terms of optimization region and universality. Herein, we propose a method for designing UEFs based on finite element calculations of electromagnetic fields and machine learning. First, the electric-field distribution of the plate-to-plate electrode structure determined using three electrode-shape parameters (ESPs) is calculated using finite element software and is drawn. Thereafter, a dataset of 2000 images is created with different electric-field strength distributions using various ESPs. Net, we employ image-processing techniques to extract nine statistical features from the gray-level information in the images. Models are trained through machine learning to predict ESPs based on the gray-level features (GLFs). Finally, the electric-field strength distribution image of the expected ideal uniform field is artificially selected. In addition, the ESPs from which the uniform electric-field is produced are predicted by the models. The proposed method provides an accurate solution for optimizing the design of a uniform electric-field and a new approach for solving inverse problems of electric-field. This involves drawing the required electric-field strength distribution image for high-voltage engineering and obtaining the required ESPs.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142594138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical simulation of spiked electrode electrostatic precipitator 尖电极静电除尘器的数值模拟

IF 1.9 4区工程技术

Journal of Electrostatics Pub Date : 2024-10-28 DOI: 10.1016/j.elstat.2024.103987

Xiaohua Wang, Hong Su, Biyu Wang, Junyu Tao

引用次数: 0

Ionic wind produced by volume corona discharges and surface dielectric barrier discharges: What role do streamers play? 体积电晕放电和表面介质屏障放电产生的离子风：流线体起什么作用？

IF 1.9 4区工程技术

Journal of Electrostatics Pub Date : 2024-10-24 DOI: 10.1016/j.elstat.2024.103988

Eric Moreau, Nicolas Benard

{"title":"Ionic wind produced by volume corona discharges and surface dielectric barrier discharges: What role do streamers play?","authors":"Eric Moreau, Nicolas Benard","doi":"10.1016/j.elstat.2024.103988","DOIUrl":"10.1016/j.elstat.2024.103988","url":null,"abstract":"<div><div>The present study compares the ionic wind produced by volume DC and AC corona discharges, and by surface dielectric barrier discharges (DBD). On the one hand, in the case of a volume corona discharge ignited between a high-voltage needle and a grounded plate, our measurements highlight that the ionic wind velocity increases in the presence of positive breakdown streamers. On the other hand, in the case of a surface AC DBD, the ionic wind velocity decreases when streamers occur. Why such a difference? The answer is not easy and the debate remains open. However, one answer would be that the streamers occurring in a volume needle-to-plate discharge leave an abundance of positive ions in the inter-electrode space and that these ions drift because of the electric field, just after the streamer propagation. On the other hand, in the case of a surface DBD, the streamers can leave positive ions in their wake but their heads especially deposit positive ions at the location where they stop propagating, <em>i.e.</em> a few millimetres from the electrode (up to about 10–15 mm). Then this positive space charge deposited at a few millimetres from the active electrode edge on the dielectric surface acts as a screen against the electric field due to the applied high voltage, thus preventing the drift of the ions remaining on the surface of the dielectric, close to the electrode edge. Having said that, the reality is that this explanation is certainly very simplistic compared with the very complex phenomena taking place in these two discharges, particularly at the times when the streamers form and propagate.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142530763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stress due to electric charge density distribution in a dielectric slab 电介质板中电荷密度分布引起的应力

IF 1.9 4区工程技术

Journal of Electrostatics Pub Date : 2024-10-19 DOI: 10.1016/j.elstat.2024.103982

John H.J. Niederhaus , Joel B. Coley , Antonio L. Levy

引用次数: 0

Electrostatic potential measurement of floating conductive objects: Some theoretical considerations and experimental results 漂浮导电物体的静电势测量：一些理论考虑和实验结果

IF 1.9 4区工程技术

Journal of Electrostatics Pub Date : 2024-10-18 DOI: 10.1016/j.elstat.2024.103986

Pedro Llovera-Segovia , Philippe Molinié , Vicente Fuster-Roig , Alfredo Quijano-López

{"title":"Electrostatic potential measurement of floating conductive objects: Some theoretical considerations and experimental results","authors":"Pedro Llovera-Segovia , Philippe Molinié , Vicente Fuster-Roig , Alfredo Quijano-López","doi":"10.1016/j.elstat.2024.103986","DOIUrl":"10.1016/j.elstat.2024.103986","url":null,"abstract":"<div><div>The measurement of electrostatic potentials of floating conductive objects can, in principle, be performed by well-known basic experimental setups. Commercial equipment is readily available and the physical principles underlaying the problem are well established. However, electrostatic measurements require special attention, as significant errors can arise from the influence of the measuring setup or the misinterpretation of the results. First, the specificity of the measuring equipment must be well understood such as the difference between field mills, induction probes and feedback probes (also called electrostatic probes). These instruments create specific boundary conditions around the object being measured such as the introduction of grounded planes or the cancellation of the electric field. This influence is particularly significant when measuring floating objects as, for example, belts and suspended or flying objects. Even when results are provided directly in volts, their interpretation varies greatly depending on the instrument used. In the case of the field mills measurements, a calibration must be performed to convert the measured electric field into the potential of the floating object. This calibration is often performed by applying a known potential to the floating object. However, this procedure may introduce errors in the measured values due to the presence of the high voltage cable used to charge the object. We describe some examples of numerical calculations and show some experimental measurements on a levitating object.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142530764","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

Experimental study of electrostatic charging related to prevention of fire and dust explosions in wood processing facilities 与防止木材加工设施火灾和粉尘爆炸有关的静电充电实验研究

IF 1.9 4区工程技术

Journal of Electrostatics Pub Date : 2024-10-02 DOI: 10.1016/j.elstat.2024.103983

Jiangtian Hou , Guilin Hu , John R. Grace , Xiaotao Bi

引用次数: 0

A method of obtaining inception voltage in spark discharge utilizing a current probe 一种利用电流探头获取火花放电起始电压的方法

IF 1.9 4区工程技术

Journal of Electrostatics Pub Date : 2024-10-01 DOI: 10.1016/j.elstat.2024.103984

Zhiyu Wang, Can Chen, Suijun Yang, Shuliang Ye

{"title":"A method of obtaining inception voltage in spark discharge utilizing a current probe","authors":"Zhiyu Wang, Can Chen, Suijun Yang, Shuliang Ye","doi":"10.1016/j.elstat.2024.103984","DOIUrl":"10.1016/j.elstat.2024.103984","url":null,"abstract":"<div><div>There is usually a significant voltage drop on the electrode during the brief delay before spark discharge occurs when the storage capacitance is small (around or below 100 pF). This leads to a decrease in capacitor energy, which may result in an overestimation of the minimum ignition energy (MIE) of dust cloud. A method that utilizes a current probe to obtain the inception discharge voltage was therefore developed. Firstly, the voltage attenuation on the electrode without spark discharge is measured, enabling an accurate calculation of parasitic capacitance. Subsequently, the inception discharge voltage in a spark discharge is calculated based on the measured spark current, thereby enabling the determination of capacitor energy before spark discharge. The results show that the fitted current curves based on the calculated inception discharge voltage exhibited consistency with the actual spark current curves, indicating that the calculated value of inception discharge voltage was consistent with the actual situation. The method effectively addresses challenges associated with measuring the inception discharge voltage in cases of small storage capacitance, which helps to calculate the capacitor energy before spark discharge for MIE testing of dust clouds that are highly sensitive to electrostatic discharge.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142359107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis and comparison of streamer discharge characteristics in equipotential live-line work gap and its simplified gaps under positive switching impulse 等电位带电线路工作间隙及其简化间隙在正开关脉冲下的流线放电特性分析与比较

IF 1.9 4区工程技术

Journal of Electrostatics Pub Date : 2024-10-01 DOI: 10.1016/j.elstat.2024.103985

Yaqi Fang, Hao Zeng, Bingsen Yang, Suhan Mao, Junkang Fang

{"title":"Analysis and comparison of streamer discharge characteristics in equipotential live-line work gap and its simplified gaps under positive switching impulse","authors":"Yaqi Fang, Hao Zeng, Bingsen Yang, Suhan Mao, Junkang Fang","doi":"10.1016/j.elstat.2024.103985","DOIUrl":"10.1016/j.elstat.2024.103985","url":null,"abstract":"<div><div>Equipotential live-line work (EPLW) is crucial for uninterrupted operation and maintenance of extra-high voltage (EHV) and ultra-high voltage (UHV) transmission lines. Determining the minimum approach distance (MAD) for EHV and UHV systems needs a thorough grasp of EPLW gap discharge mechanisms and characteristics for worker protection. Therefore, we conduct positive switching impulse discharge experiments on EPLW gap and its simplified gaps at a gap distance of 3 m, study the discharge development process and streamer inception characteristics of two gaps, and perform comparative analysis. The experimental results show that sim-worker's feet-test tower gap and the bundle conductor + rod-plane gaps (rod electrode with radii of 2.5 cm and 5 cm) occur multiple streamer inception. The bundle conductor + rod electrode with a radius of 8 cm only has one streamer inception. The average inception voltage, inception time delay and its dispersion of bundle conductor + rod electrode will all rise with the size of the electrode. Compared to the bundle conductor + rod electrodes with radii of 2.5 cm and 8 cm, the average streamer inception time delay and inception voltage of sim-worker's feet are only 3.6 % and 5.1 % subtly higher than those of the bundle conductor + rod electrode with a radius of 5 cm, and a high degree of similarity is exhibited in their probability distribution trends of streamer inception time delay. A larger electrode size will increase the boost time delay, statistical time delay, and its dispersion of bundle conductor + rod electrode, they are closer to sim-worker's feet when the radius of bundle conductor + rod electrode is 5 cm.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142359108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Advanced image reconstruction for electrostatic tomography in gas-solid two-phase flow based on convolutional autoencoder neural network 基于卷积自动编码器神经网络的先进气固两相流静电断层图像重建技术

IF 1.9 4区工程技术

Journal of Electrostatics Pub Date : 2024-09-27 DOI: 10.1016/j.elstat.2024.103979

Jiahe Lyu, Xuezhen Cheng, Zhen Song, Jiming Li

{"title":"Advanced image reconstruction for electrostatic tomography in gas-solid two-phase flow based on convolutional autoencoder neural network","authors":"Jiahe Lyu, Xuezhen Cheng, Zhen Song, Jiming Li","doi":"10.1016/j.elstat.2024.103979","DOIUrl":"10.1016/j.elstat.2024.103979","url":null,"abstract":"<div><div>The image reconstruction of flowing charged particles in gas-solid two-phase (GSTP) flow can be achieved through electrostatic tomography (EST). Accurate image reconstruction is crucial for detecting the movement patterns of the particles. In order to improve the quality of reconstructed images, a unique convolutional autoencoder neural network (CANN) is proposed. This study uses an image set generated by the linear backprojection (LBP) algorithm to train the CANN, which consists of an encoder and a decoder. The encoder utilizes convolutional and max-pooling layers to reduce the dimensionality of the images and extract key features, while the decoder restores and reconstructs the images through up-sampling and convolutional operations to closely approximate the reference image. To prevent overfitting, dropout layers are introduced after each max-pooling layer in the encoder. To verify the anti-noise capability of the network, Gaussian white noise ranging from 10 dB to 20 dB is added to the test set. The proposed CANN has been validated through simulations and experiments, demonstrating its effectiveness in overcoming noticeable artifacts and noise in reconstructed images when identifying GSTP flow patterns. Furthermore, it shows significant enhancements in imaging outcomes compared to conventional image reconstruction techniques and some current deep learning algorithms.</div></div>","PeriodicalId":54842,"journal":{"name":"Journal of Electrostatics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142326345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electrostatic charging of material webs in gravure printing presses 凹版印刷机材料卷筒的静电充电

IF 1.9 4区工程技术

Journal of Electrostatics Pub Date : 2024-09-19 DOI: 10.1016/j.elstat.2024.103980

Alexander Götz , Armin Wolfram , Wolfgang Schubert

引用次数: 0