Diagnostyka最新文献_第5页

A cough-based Covid-19 detection with gammatone and mel-frequency cepstral coefficients 应用gammatone和多频倒谱系数进行基于咳嗽的新冠肺炎检测

Diagnostyka Pub Date : 2023-06-01 DOI: 10.29354/diag/166330

Elmehdi Benmalek, Jamal Elmhamdi, A. Jilbab, A. Jbari

{"title":"A cough-based Covid-19 detection with gammatone and mel-frequency cepstral coefficients","authors":"Elmehdi Benmalek, Jamal Elmhamdi, A. Jilbab, A. Jbari","doi":"10.29354/diag/166330","DOIUrl":"https://doi.org/10.29354/diag/166330","url":null,"abstract":"Many countries have adopted a public health approach that aims to address the particular challenges faced during the pandemic Coronavirus disease 2019 (COVID-19). Researchers mobilized to manage and limit the spread of the virus, and multiple artificial intelligence-based systems are designed to automatically detect the disease. Among these systems, voice-based ones since the virus have a major impact on voice production due to the respiratory system's dysfunction. In this paper, we investigate and analyze the effectiveness of cough analysis to accurately detect COVID-19. To do so, we distinguished positive COVID patients from healthy controls. After the gammatone cepstral coefficients (GTCC) and the Mel-frequency cepstral coefficients (MFCC) extraction, we have done the feature selection (FS) and classification with multiple machine learning algorithms. By combining all features and the 3-nearest neighbor (3NN) classifier, we achieved the highest classification results. The model is able to detect COVID-19 patients with accuracy and an f1-score above 98 percent. When applying FS, the higher accuracy and F1-score were achieved by the same model and the ReliefF algorithm, we lose 1 percent of accuracy by mapping only 12 features instead of the original 53.","PeriodicalId":52164,"journal":{"name":"Diagnostyka","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42546133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Parameters that influence the partial discharges occurrence in cavity defect within electrical cable insulation 影响电缆绝缘内部空腔缺陷局部放电发生的参数

Diagnostyka Pub Date : 2023-06-01 DOI: 10.29354/diag/166378

Abdelkader Elagoun, T. Seghier

{"title":"Parameters that influence the partial discharges occurrence in cavity defect within electrical cable insulation","authors":"Abdelkader Elagoun, T. Seghier","doi":"10.29354/diag/166378","DOIUrl":"https://doi.org/10.29354/diag/166378","url":null,"abstract":"The electrical cable reliability is largely linked to the state of its insulation, which can be threatened by the partial discharges (PDs) activity. This phenomenon is localized in defects created within insulation during the manufacture process and the cable installation. The cavity defect is among the most known defects within the insulating material filled with different gases and having various forms. Under electrical stress, the PDs occur and lead with time to a cable failure. The PDs simulation in cavity defect within cable insulation has became an important tool for a complementary understanding of the experimental task. The plasma model has been considered in last decade as an alternative to describe physically and chemically the PDs mechanism versus the other models such as the capacitance, conductance model. Using plasma model our work aims to simulate the PDs in cavity defect within cable insulation by showing the parameters influence such as the type of gas contained in the cavity, the voltage magnitude and frequency imposed on the insulation on their occurrence through its occurrence mechanisms. This helps to assess the PDs severity on the insulation system to carry out its diagnosis and therefore to have an effective reliability of cable.","PeriodicalId":52164,"journal":{"name":"Diagnostyka","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43195914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Elastohydrodynamic analysis of a journal bearing with different grade oils considering thermal and cavitation effects using CFD-FSI 考虑热效应和空化效应的不同油级滑动轴承的CFD-FSI弹流动力学分析

Diagnostyka Pub Date : 2023-05-28 DOI: 10.29354/diag/166102

Z. Kadhim, Liqaa Abd-Alshaheed, Fatima Rahima, A. Ridha

{"title":"Elastohydrodynamic analysis of a journal bearing with different grade oils considering thermal and cavitation effects using CFD-FSI","authors":"Z. Kadhim, Liqaa Abd-Alshaheed, Fatima Rahima, A. Ridha","doi":"10.29354/diag/166102","DOIUrl":"https://doi.org/10.29354/diag/166102","url":null,"abstract":"This paper investigates a three-dimensional CFD analysis of hydrodynamic journal bearing performance for two different available types of lubricants, SEA 10W50 and SEA 15W40, considering thermal, elastic deformation, and cavitation effects. A 3-dimensional CFD model founded on continuity, momentum, energy, in addition elasticity equations has been implemented. The analysis is performed for a bearing with different journal speeds (1000-3000rpm) and eccentricity ratios (0.1-0.9). The cavitation effect was considered using the model of Zwart–Gerber–Balamri multiphase flow model. The bearing material elastic deformation was considered by implementing the two-way FSI technique through ANSYS-FLUENT 2019 R2. A comparative study of the oil film temperature, thermal pressure, also the load capacity by the bearing has been performed. By comparing the current work's oil film temperature results with those obtained by Ferron et al (1983), with a maximum deviation between the results not exceeding 3 percent, the mathematical model was validated. The findings demonstrate that, once the cavitation consequence is taken into account, the lubricant film pressure decreases. Furthermore, at what time the bearing rotates at greater eccentricity ratios and rotational speeds, more deformation material of the bearing is seen. The current research may help in predicting the bearing performance parameters in real-world situations.","PeriodicalId":52164,"journal":{"name":"Diagnostyka","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45270990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An experimental study of forced vibration on natural convection between closed ended concentric and eccentric annular of horizontal cylinder 水平圆柱体闭端同心与偏心环间自然对流强迫振动的实验研究

Diagnostyka Pub Date : 2023-05-22 DOI: 10.29354/diag/165931

Baydaa K. Khalil, A. Saleh, A. Ekaid

{"title":"An experimental study of forced vibration on natural convection between closed ended concentric and eccentric annular of horizontal cylinder","authors":"Baydaa K. Khalil, A. Saleh, A. Ekaid","doi":"10.29354/diag/165931","DOIUrl":"https://doi.org/10.29354/diag/165931","url":null,"abstract":"An experimental study has been done into the effects of vertical mechanical vibrating, vertical eccentricity, and the Rayleigh number on natural convection heat transferring out of a horizontally enclosed, ending cylindrical annulus with a radius rate of 2.6 and an aspect ratio of (2:1). The annulus produced between two concentric and vertically eccentric circular cylinders is positioned horizontally, and its internal wall is uniformly heated while isothermally cooling the external wall. The range of present conditions for Rayleigh number is 5×10^4 ≤ Ra≤ 6.48×10^6, and Pr = 0.703, the frequency of vibration is 0 ≤ f ≤ 20Hz; and the amplitude is b mm), with possible exclusion of the highest positive and negative eccentricities. Plots of the average Nusselt number variation against the Rayleigh number showed a significant increase in negative vertical eccentricity. It was found that the average Nusselt decreased as the internal cylinder changed its location vertically from negative to positive through the center, which is normally a desirable effect, but has no advantage over the concentric on the positive side. The Rayleigh number was found to be relatively sensitive to eccentricity. However, an increase of Rayleigh number leads to a nearly proportional increase in the average Nusselt number and a smaller yet still substantial increase in positive eccentricity. This study concluded that the vibration under the current experimental setup significantly affects the concentric position of the internal cylinder, whether the effect is positive or negative. The vibrational average Nusselt number increased in varying proportions, depending on the location of the heated inner cylinder.","PeriodicalId":52164,"journal":{"name":"Diagnostyka","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44650629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study and analysis of the propagation of harmonics in electrical grid connected photovoltaic system 并网光伏系统中谐波传播的研究与分析

Diagnostyka Pub Date : 2023-05-15 DOI: 10.29354/diag/163629

Y. Djeghader, S. Boumous, Z. Boumous

{"title":"Study and analysis of the propagation of harmonics in electrical grid connected photovoltaic system","authors":"Y. Djeghader, S. Boumous, Z. Boumous","doi":"10.29354/diag/163629","DOIUrl":"https://doi.org/10.29354/diag/163629","url":null,"abstract":"Renewable energy sources especially solar energy connected to an electrical grid system by using power electronic devices, known that devices degrade the power quality and especially generate harmonic currents. This article presents the study investigation and propagation of harmonics in the integration system of an electric grid connected to the photovoltaic system in the presence or not of a non-linear load (polluting load). In this study, the perturb and observe type MPPT controller for the boost converter and the PWM control for the three-phase inverter which provides the connection are used. We use a passive filtering technique (single and multiple filters) to mitigate the harmonic currents generated by the non-linear load. In the first case where the integration system is alone, the results obtained show that the values of the total harmonic distortion (THD) rates are within the standard used. But in the case of the presence of the non-linear load, the THD values are higher than the used norm. After using our proposed technique, the values of THD obtained are in the norm used for the application of a tuned filter at the fifth harmonic, and better results find with using of multiple filters (fifth and seventh).","PeriodicalId":52164,"journal":{"name":"Diagnostyka","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44107916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An integrated study for solving high vibration problem of a deep well turbine pump 解决深井涡轮泵高振动问题的综合研究

Diagnostyka Pub Date : 2023-05-13 DOI: 10.29354/diag/166096

Dalia M. El- Gazzar

引用次数: 0

Solar photovoltaic water pumping system approach for electricity generation and irrigation: Review 用于发电和灌溉的太阳能光伏水泵系统方法综述

Diagnostyka Pub Date : 2023-05-03 DOI: 10.29354/diag/165849

Edham Ibrahim, Sam Aslan

{"title":"Solar photovoltaic water pumping system approach for electricity generation and irrigation: Review","authors":"Edham Ibrahim, Sam Aslan","doi":"10.29354/diag/165849","DOIUrl":"https://doi.org/10.29354/diag/165849","url":null,"abstract":"Solar energy for water pumping is a possible alternative to conventional electricity and diesel-based pumping systems, particularly given the current electricity shortage and the high cost of diesel. The literature survey includes a comparison between previous studies of pumping systems using photovoltaic cells, and the extent of the influence of external factors such as radiation intensity and temperature on the efficiency of the system. Additionally, the use of water storage to generate electrical energy through potential energy by means of hydraulic generators and the effect of the amount of flow and height on the amount of energy generated, as well as the types of hydraulic generators are discussed in this paper. Nowadays, solar power is a major contributor to the world's electrical energy supply, either by generating electrical energy directly from solar cells or through water storage, which will be covered in this review. When compared to electricity or diesel-powered systems, solar water pumping is more cost-effective for irrigation and water supply in rural, urban, and remote areas. This paper also highlights the challenges that must be overcome to develop high-quality, long-lasting solar power technology for future use.","PeriodicalId":52164,"journal":{"name":"Diagnostyka","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48214234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of the variety of steel tube materials on the impedance behavior of non-destructive Eddy current testing 钢管材料种类对无损涡流检测阻抗特性的影响

Diagnostyka Pub Date : 2023-05-03 DOI: 10.29354/diag/163092

Djamel Ziani, S. Bendimerad, A. Ayad

引用次数: 0

The impact of layout and concentration of defects on the electromechanical constraints in the MV cables insulation 缺陷布置和集中对中压电缆绝缘机电约束的影响

Diagnostyka Pub Date : 2023-05-01 DOI: 10.29354/diag/162871

Medoukali Hemza, Zegnini Boubakeur

引用次数: 0

Fault diagnosis of high-speed rotating machines using MATLAB 基于MATLAB的高速旋转机械故障诊断

Diagnostyka Pub Date : 2023-04-24 DOI: 10.29354/diag/162971

Mahesh Joshi, K. Pujar

引用次数: 1