Elektronika Ir Elektrotechnika最新文献_第8页

Hydro-Turbine Coordination Power Predictive Method of Improved Multi-Layer Neural Network Considered Adaptive Anti-Normalisation Strategy 考虑自适应反归一化策略的改进多层神经网络水轮机协调功率预测方法

IF 1.3 4区工程技术

Elektronika Ir Elektrotechnika Pub Date : 2023-02-27 DOI: 10.5755/j02.eie.28599

Fannie Kong, Jiahui Xia, Daliang Yang, Tianshun Lan

{"title":"Hydro-Turbine Coordination Power Predictive Method of Improved Multi-Layer Neural Network Considered Adaptive Anti-Normalisation Strategy","authors":"Fannie Kong, Jiahui Xia, Daliang Yang, Tianshun Lan","doi":"10.5755/j02.eie.28599","DOIUrl":"https://doi.org/10.5755/j02.eie.28599","url":null,"abstract":"Due to the limitation of economics and time cost, the data obtained from hydro-turbine coordination field test are insufficient to fully guide the setting of unit operating parameters. To enlarge the amount of data, realise power point tracking, and avoid the problems of high non-linearity with hydro-turbine physical model which is difficult to simulate in actual field, a mathematical prediction model is proposed based on an improved multi-layer neural network. Using the rule activation function, L2 regularisation, Adam optimiser and its gradient parameters are optimised by PSO algorithm in the prediction model. It is found that lacking true value in the process of anti-normalisation leads to difficulty for actual forecast of neural network. Therefore, an adaptive anti-normalisation strategy is proposed to improve the actual prediction accuracy, which can judge the value of the interval. According to the analysis of examples with hydro-turbine coordination and non-coordination test, the results show that the proposed prediction model and interval strategy can effectively forecast the coordination operating conditions of the turbine with high accuracy under small samples.","PeriodicalId":51031,"journal":{"name":"Elektronika Ir Elektrotechnika","volume":"126 39","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41247855","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

Smart Multi-Agent Framework for Automated Audio Testing 自动音频测试的智能多代理框架

IF 1.3 4区工程技术

Elektronika Ir Elektrotechnika Pub Date : 2023-02-27 DOI: 10.5755/j02.eie.33222

J. Kovacevic, Uros Radujko, Miodrag Djukic, Teodora Novkovic

引用次数: 0

A Non-Invasive Method of Monitoring Glucose in Blood Using a Planar Yagi-Uda Antenna and Microstrip Filter 利用平面Yagi-Uda天线和微带滤波器的无创血糖监测方法

IF 1.3 4区工程技术

Elektronika Ir Elektrotechnika Pub Date : 2023-02-27 DOI: 10.5755/j02.eie.31173

Anveshkumar Nella, R. Aldhaheri, Jagadeesh Babu Kamili, N. Sobahi

{"title":"A Non-Invasive Method of Monitoring Glucose in Blood Using a Planar Yagi-Uda Antenna and Microstrip Filter","authors":"Anveshkumar Nella, R. Aldhaheri, Jagadeesh Babu Kamili, N. Sobahi","doi":"10.5755/j02.eie.31173","DOIUrl":"https://doi.org/10.5755/j02.eie.31173","url":null,"abstract":"This work presents a non-invasive method to determine the glucose levels in blood samples using a planar Yagi-Uda antenna and a novel microstrip filter. The proposed antenna operates at 5.5 GHz and exhibiting uni-directional pattern giving a maximum gain of 6.74 dBi at the operating band. A commercially available and low-cost FR-4 substrate of dimensions 30 mm×40 mm×1.6 mm is used as a dielectric substrate. A finger phantom resembling a human finger is designed in the simulation environment, which consists of bone, skin, blood, fat as different layers. The glucose concentration is varied from 0 mg/dL to 500 mg/dL and the shifts in the frequencies are observed by keeping the phantom at various locations surrounding the antenna. A good frequency shift of 26 MHz is observed when the phantom is placed below the antenna. A good similarity is observed between the simulation and measurement results. Also, a novel microstrip filter, operating at 5.5 GHz, is developed, and the frequency shifts are studied by keeping a finger phantom at the top of the filter. The designed filter is shown to give a maximum frequency shift of 4 MHz when the glucose concentration changes from 250 mg/dL to 500 mg/dL. This study is supported by analysing transmission coefficient parameters and group delay characteristics.","PeriodicalId":51031,"journal":{"name":"Elektronika Ir Elektrotechnika","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47305218","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: 1

New Approach-based MPP Tracking Design for Standalone PV Energy Conversion Systems 基于新方法的独立光伏能量转换系统MPP跟踪设计

IF 1.3 4区工程技术

Elektronika Ir Elektrotechnika Pub Date : 2023-02-27 DOI: 10.5755/j02.eie.32269

Sy-Toan Ngo, Chian-Song Chiu, Thanh-Dong Ngo, C. Nguyen

{"title":"New Approach-based MPP Tracking Design for Standalone PV Energy Conversion Systems","authors":"Sy-Toan Ngo, Chian-Song Chiu, Thanh-Dong Ngo, C. Nguyen","doi":"10.5755/j02.eie.32269","DOIUrl":"https://doi.org/10.5755/j02.eie.32269","url":null,"abstract":"In searching for a maximum power point (MPP) using a DC boost converter for photovoltaic (PV) energy conversion systems, we realised that the fast and accurate way to find the suitable duty ratio value is the core problem to enhance the energy conversion efficiency of the PV system. Under uniform irradiation, the panels will generate the same values, so they have only one peak on the P-V curve; conventional MPP tracking methods easily obtain this MPP. However, under partial shading conditions, many peaks are created, traditional MPP tracking methods can fall into the local MPP, and this issue will cause energy loss and reduce PV energy conversion efficiency. To avoid this disadvantage, this paper proposes a hybrid method (HM) by combining the improved chicken swarm optimisation (CSO) method and the incremental conductance (InC) algorithm for a DC standalone PV energy conversion system. In this hybrid method, the improved CSO modified approach is used to search the global region, and the InC algorithm is responsible for capturing the top of this global region. MATLAB simulation and experimental results were performed to demonstrate that the proposed method has achieved the global MPP under uniform solar irradiance and partial shadow effects.","PeriodicalId":51031,"journal":{"name":"Elektronika Ir Elektrotechnika","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49215170","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: 1

Multi-Objective Optimisation-based Robust H∞ Controller Design Approach for a Multi-Level DC-DC Voltage Regulator 基于多目标优化的多级DC-DC电压调节器鲁棒H∞控制器设计方法

IF 1.3 4区工程技术

Elektronika Ir Elektrotechnika Pub Date : 2023-02-27 DOI: 10.5755/j02.eie.32887

Rıdvan Keskin, Ibrahim Aliskan

{"title":"Multi-Objective Optimisation-based Robust H∞ Controller Design Approach for a Multi-Level DC-DC Voltage Regulator","authors":"Rıdvan Keskin, Ibrahim Aliskan","doi":"10.5755/j02.eie.32887","DOIUrl":"https://doi.org/10.5755/j02.eie.32887","url":null,"abstract":"In case an analytical approach to the selection of any weighting function is not possible, the selection process is usually a random and time-consuming process. In robust H∞ control theory, the selection of scalar, time, or frequency-dependent weighting functions is the main issue to shape the amplitude-frequency characteristic curve of the feedback controller. Therefore, we propose a robust H∞ control approach which utilises the multi-objective grey wolf optimisation algorithm (MOGWO) to obtain the optimal performance weighting functions in the presence of right half-plane zeros and limited bandwidth constraints. A trade-off design flowchart is proposed, providing Pareto optimal solutions to choose the optimal configuration of the robust feedback controller. The control method is structured by combining the robust H∞ optimal technique and the multi-objective algorithm. The effectiveness of the approach is compared with the non-convex single-objective heuristic solutions like the multi-verse optimisation algorithm (MVO), whale optimisation algorithm (WOA), and grey wolf optimisation algorithm (GWO). The focus of this design is to track and stabilise the output voltage of the DC-DC converter in the presence of external disturbances and parameter uncertainties. The optimised controllers are implemented using a digital signal processor (DSP) on a 200 W interleaved boost converter. The simulation results and experimental findings show that the proposed control method provides supreme disturbance rejection along with maintaining the stability of the system.","PeriodicalId":51031,"journal":{"name":"Elektronika Ir Elektrotechnika","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44737135","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: 2

Analysis and Implementation of Switched Capacitor-based Multi-Level Inverter for Electric Vehicles Applications 基于开关电容的电动汽车多级逆变器的分析与实现

IF 1.3 4区工程技术

Elektronika Ir Elektrotechnika Pub Date : 2023-02-27 DOI: 10.5755/j02.eie.33053

Murugesan Manivel, Lakshmi Kaliappan

{"title":"Analysis and Implementation of Switched Capacitor-based Multi-Level Inverter for Electric Vehicles Applications","authors":"Murugesan Manivel, Lakshmi Kaliappan","doi":"10.5755/j02.eie.33053","DOIUrl":"https://doi.org/10.5755/j02.eie.33053","url":null,"abstract":"Significant interest has been shown in switched capacitor (SC)-based multi-level inverters (MLIs), which decrease the need for a DC supply and enhance power quality. The common issues with SC-MLIs include an uneven distribution of conducting paths, increased voltage drop across capacitors, the sum of all inverter DC link voltages across the highest voltage rated switches, and a higher total standing voltage (TSV). The purpose of this paper is to create a SC-MLI with less components in order to maintain a constant voltage across the capacitors, to obtain higher voltage gain with fewer parts, fewer conducting routes, lower TSV, and to create a more affordable and effective inverter. The structure of the MLI is created by a cascade interconnection between the number of SC cells. A single input multiple output (SIMO) converter boosts the DC-link voltage over the stable DC voltage of the solar panels using a modified perturb and observe (P&O) method. Additionally, fewer switches in the conduction path and 50 % of the switches operating at normal frequency guarantee a decrease in an overall loss of power in the proposed network. The benefits of the recommended MLI are made clear by comparing them with 17-level MLIs in terms of the number of elements, stress, gain, and cost factor. Detailed experimental results are shown under various transient conditions to show that the 17-level prototype is operationally viable. The total harmonic distortion (THD) is found to be identical and is less than 5 %, which meets IEEE standards.","PeriodicalId":51031,"journal":{"name":"Elektronika Ir Elektrotechnika","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45793058","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: 3

An IoT-based Smart Home Application with Barrier-Free Stairs for Disabled/Elderly People 基于物联网的残疾人/老年人无障碍楼梯智能家居应用

IF 1.3 4区工程技术

Elektronika Ir Elektrotechnika Pub Date : 2023-02-27 DOI: 10.5755/j02.eie.30731

S. Unaldi, Nesibe Yalcin, Enes Elçi

引用次数: 1

PRZEMYSŁOWE AKCELERATORY ELEKTRONÓW I ICH ZASTOSOWANIA W TECHNOLOGIACH RADIACYJNYCH ASPEKTY NIEZAWODNOŚCIOWE I EKONOMICZNE 工业电子加速器及其在辐射技术中的应用的可靠性和经济性

4区工程技术

Elektronika Ir Elektrotechnika Pub Date : 2023-01-31 DOI: 10.15199/13.2023.1.2

Sylwester Bułka

引用次数: 0

A New Machine Vision Method for Target Detection and Localization of Malleable Iron Pipes: An Experimental Case 一种新的可锻铸铁管目标检测与定位的机器视觉方法:一个实验案例

IF 1.3 4区工程技术

Elektronika Ir Elektrotechnika Pub Date : 2022-12-21 DOI: 10.5755/j02.eie.33004

Zhongqiang Pan, Dong Zhang

{"title":"A New Machine Vision Method for Target Detection and Localization of Malleable Iron Pipes: An Experimental Case","authors":"Zhongqiang Pan, Dong Zhang","doi":"10.5755/j02.eie.33004","DOIUrl":"https://doi.org/10.5755/j02.eie.33004","url":null,"abstract":"Malleable iron pipes are widely used in construction, manufacturing, aerospace, and many other fields. Cast malleable iron pipes need to be treated flat to meet the needs of different shapes and sizes. This process is usually completed manually, which is low efficiency and is subject to potential safety risks. To solve this problem, a machine vision method is proposed to detect and localize malleable iron pipes. Point cloud images of malleable iron pipes are obtained by the Random Sample Consensus (RANSAC) algorithm, and precise matching is completed by the Iterative Closest Point (ICP) algorithm to obtain more accurate positions, so as to realize robot grasping. The grasping experiments of malleable iron pipes with the same and different specifications were carried out using a specially designed experimental platform. The results show that malleable iron pipes can be identified effectively and that the corresponding grasping success rate is more than 85 %. The target detection and localization method can obtain the three-dimensional (3D) position of malleable iron pipes to improve grasping efficiency, which provided a certain theoretical basis and guiding significance to improve production efficiency in practice.","PeriodicalId":51031,"journal":{"name":"Elektronika Ir Elektrotechnika","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48918950","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

Sea State Characterization Using Experimental Synthetic Aperture Radar Raw Data in Two-Dimensions and the Modified Fractal Signature Method 基于二维实验合成孔径雷达原始数据的海况表征及改进的分形特征方法

IF 1.3 4区工程技术

Elektronika Ir Elektrotechnika Pub Date : 2022-12-21 DOI: 10.5755/j02.eie.31502

Apostolos Kotopoulis, B. Massinas, Georgios Pouraimis, P. Frangos

引用次数: 0