Diagnostyka最新文献_第10页

The modal analisis of a two-link mechanical system of a robot manipulator 机械手双连杆机械系统的模态分析

Diagnostyka Pub Date : 2022-08-31 DOI: 10.29354/diag/152463

Yevhen Kharchenko, V. Vira, V. Palyukh, B. Vasyliv

引用次数: 0

The stress analysis effect on structural health monitoring in functionally graded shell 应力分析对功能梯度壳结构健康监测的影响

Diagnostyka Pub Date : 2022-07-21 DOI: 10.29354/diag/152180

N. Abd-Ali, A. Madeh

{"title":"The stress analysis effect on structural health monitoring in functionally graded shell","authors":"N. Abd-Ali, A. Madeh","doi":"10.29354/diag/152180","DOIUrl":"https://doi.org/10.29354/diag/152180","url":null,"abstract":"The common damage in engineering structures, especially in functionally graded materials, such as failure resulting from fiber breaking or cracking in the matrix or deboning between fibers and matrix, as well as the delamination between the composite material plies and between its layers, may be due to thermal effects, vibration, load concentration as a result of stress and strain for provides information’s about structural health monitoring. Virtual energy method such as Hamilton's was used to investigate the effect of the design parameters such as side to thickness and modular as well as material graduation index ratio on the stress-strain relationships, displacement, resultants of stresses, and resultants of mid plane strain. The analysis and simulation of the FGM shells is done in this paper utilizing MATLAB19 code and ABAQUS20 programs. The distribution of characteristics across shell thickness had also been determined using a power law. Normal stress was varied gradually from 5.74 MPa to 9.55 MPa with material index (n) from 0 to 10 respectively, while shear stress varied from 4.2 to 8.23 MPa for the same value of (n). The strain percent increased slightly from 0.00059 to 0.0012 with displacement 0.22 and 1.2 respectively for the same value of (n). method, thickness ratio.","PeriodicalId":52164,"journal":{"name":"Diagnostyka","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42642314","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

Recurrent neural network optimization for wind turbine condition prognosis 风机状态预测的递归神经网络优化

Diagnostyka Pub Date : 2022-06-27 DOI: 10.29354/diag/151608

Kerboua Adlen, Kelaiaia Ridha

引用次数: 1

Health management using fault detection and fault tolerant control of multicellular converter applied in more electric aircraft system 基于故障检测和容错控制的多蜂群变换器健康管理在电动飞机系统中的应用

Diagnostyka Pub Date : 2022-06-21 DOI: 10.29354/diag/151039

M. A. Mahboub, B. Rouabah, M. R. Kafi, H. Toubakh

{"title":"Health management using fault detection and fault tolerant control of multicellular converter applied in more electric aircraft system","authors":"M. A. Mahboub, B. Rouabah, M. R. Kafi, H. Toubakh","doi":"10.29354/diag/151039","DOIUrl":"https://doi.org/10.29354/diag/151039","url":null,"abstract":"The increased cost of fuel and maintenance in aircraft system lead to the concept of more electric aircraft, moreover this concept increase the use of power electronic converters in aircraft power system. Since in this application, the reliability is a crucial feature. Therefore, the use of more efficient, reliable and robust power converter with health management capability will be a big challenge. Multicellular topology of power converters has the required performance in terms of efficiency and robustness. However, the increased complexity of control and more power components (power switches and capacitors) goes along with an increase in possibility of failure in multicellular topology. Therefore, the main contribution of this paper is the use of multicellular topology advantageous with fault diagnosis and fault tolerant control in order to increase the robustness reliability. The health management using a fault detection with Fuzzy Pattern Matching (FPM) algorithm when a failure in power switches or flying capacitors of multicellular converter and a Fault Tolerant Control (FTC) with sliding mode of second parallel three cells multicellular converters. Simulation results with Matlab show the increased efficiency and the continuity of work during failure mode in aircraft power system.","PeriodicalId":52164,"journal":{"name":"Diagnostyka","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46326862","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: 6

Simulation of the effect laminate sequence on delamination mode-I with elastic couplings 带弹性耦合的层合顺序对分层模式ⅰ的影响模拟

Diagnostyka Pub Date : 2022-06-07 DOI: 10.29354/diag/150547

Mustafa Alhussein, Zuhair Ameer, A. Hamzah

引用次数: 3

Numerical analysis and optimization of a winglet sweep angle and winglet tip chord for improvement of aircraft flight performance 为提高飞机飞行性能的小翼后掠角和小翼尖弦的数值分析与优化

Diagnostyka Pub Date : 2022-06-06 DOI: 10.29354/diag/150479

Ali Alkhafaji, G. Panatov, A. Boldyrev

引用次数: 1

Magnetic field evaluation around 400 KV underground power cable under harmonics effects 谐波作用下400kV地下电力电缆周围磁场的评价

Diagnostyka Pub Date : 2022-05-17 DOI: 10.29354/diag/150068

Houari Boudjella, Ahmed Abi Ayad, T. Rouibah, Benyekhlef Larouci, Thamer A. H. Alghamdi, A. Althobaiti, S. Ghoneim, Abdelkader Si Tayeb

{"title":"Magnetic field evaluation around 400 KV underground power cable under harmonics effects","authors":"Houari Boudjella, Ahmed Abi Ayad, T. Rouibah, Benyekhlef Larouci, Thamer A. H. Alghamdi, A. Althobaiti, S. Ghoneim, Abdelkader Si Tayeb","doi":"10.29354/diag/150068","DOIUrl":"https://doi.org/10.29354/diag/150068","url":null,"abstract":"Power lines or underground power cables generate electromagnetic interaction with other objects near to them. This study evaluates the magnetic field emitted by underground extra high voltage cables. The presented work aims to show a numerical simulation of the magnetic field of a buried 400 kV underground power line, which is used as a novel prototype in several countries at a short distance. The underground power cable study, in the presence of the current harmonics at different positions, with time variation by finite element resolution, using Comsol Multiphysics with Matlab software in two dimensions. The simulation results illustrate the magnetic flux density variation-in terms of amplitude and distribution as a function of different actual harmonics rates. The underground cable performance and magnetic field have affected by the harmonics effects. The maximum magnetic induction levels generated by significant harmonics are superior to the limits recommended by the international standard norms. In this paper, shielding has been used as an appropriate remedy to attenuate the magnetic field.","PeriodicalId":52164,"journal":{"name":"Diagnostyka","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46488097","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

FTIR and FDS assessment of mineral oil under low electrical discharge 低放电条件下矿物油的FTIR和FDS评价

Diagnostyka Pub Date : 2022-05-12 DOI: 10.29354/diag/149994

B. Saliha, Benabed Fadila, Fofana Issouf, Mokhnache Leila

{"title":"FTIR and FDS assessment of mineral oil under low electrical discharge","authors":"B. Saliha, Benabed Fadila, Fofana Issouf, Mokhnache Leila","doi":"10.29354/diag/149994","DOIUrl":"https://doi.org/10.29354/diag/149994","url":null,"abstract":"Transformers are crucial elements in the transmission and distribution of electrical energy. The importance of diagnosing these equipments are two-fold: (1) the necessity of service reliability and (2) the likelihood to avoid economic and environmental concerns. Under service conditions, the electrical and thermal stresses or chemical contaminants may degrade the insulation oil inside the transformer and cause incipient failures or reduce its service life. Partial discharges well recognized to be among the most common stresses that can lead to slow but steady degradation of insulating oil in transformers. The present work aims at understanding the influence of low energy electrical discharge on mineral oil based on two spectroscopic methods: FTIR spectroscopy and Frequency Domain Spectroscopy (FDS). An electrical fault has been created by continuous discharge of 10 kV on the surface of various oil samples according to the ASTM D6180. From the FDS results, it was found that the amount of charge carriers and moisture increased with the aging time elapsed that influences the conduction phenomena and in turn, increases the dissipation factor. These results are confirmed by the FTIR results, which show that the intensity of the peak absorbance of the C–H and C-C functional group decreased with aging. The application of these two methods may help monitoring the condition of oil. A combined FTIR and FDS measurements highlighted the correlations between modifications in electrical properties and changes in the chemical structure of the oil under electrical accelerated ageing.","PeriodicalId":52164,"journal":{"name":"Diagnostyka","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42237161","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

The Natural convection inside a 3D triangular cross section cavity filled with nanofluid and included cylinder with different arrangements 填充纳米流体并包含不同排列圆柱体的三维三角形截面空腔内的自然对流

Diagnostyka Pub Date : 2022-05-05 DOI: 10.29354/diag/149734

Z. K. Ghoben, A. Hussein

{"title":"The Natural convection inside a 3D triangular cross section cavity filled with nanofluid and included cylinder with different arrangements","authors":"Z. K. Ghoben, A. Hussein","doi":"10.29354/diag/149734","DOIUrl":"https://doi.org/10.29354/diag/149734","url":null,"abstract":"In this paper the laminar unsteady natural convection heat transfer of (Al 2 O 3 -water) nanofluid inside 3D triangular cross section cavity was investigated. The cavity was heated differentially, the vertical walls were kept at different constant temperatures. The left hot and the right cold. The effect of the solid volume fraction was examined for two values and compared with the pure water results. The (Ra) range studied was (103 ≤ Ra ≤ 106). Inserting cylindrical body inside the cavity also investigated in three cases. One concentric cylinder has radius (15%) of the cavity side length. The other cases were of two cylinders having radius (7.5%) of the cavity side length, aligned vertically or nonaligned. The results show that the higher solid volume fraction gives the maximum enhancement of the average (Nu) and this enhancement increases with (Ra) increase. For the cases with inner cylinders, the average (Nu) enhanced for the case of double cylinders over single cylinder. On other hand, the nonaligned position of the cylinders giving more enhancement than other position. As like as, the location of maximum horizontal or vertical velocities were varied with the cylinders position while (Ra) has no effect.","PeriodicalId":52164,"journal":{"name":"Diagnostyka","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47281579","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: 11

The effect of added point masses on the geometrically non-linear vibrations of SCSC rectangular plates 附加质点对SCSC矩形板几何非线性振动的影响

Diagnostyka Pub Date : 2022-05-05 DOI: 10.29354/diag/149743

Mustapha , Hamdani, M. El Kadiri, R. Benamar

{"title":"The effect of added point masses on the geometrically non-linear vibrations of SCSC rectangular plates","authors":"Mustapha , Hamdani, M. El Kadiri, R. Benamar","doi":"10.29354/diag/149743","DOIUrl":"https://doi.org/10.29354/diag/149743","url":null,"abstract":"A point mass added to a plate may have a significant effect on its linear and nonlinear dynamics, including frequencies, mode shapes and the forced response to external loading. In the present paper, a simply supported clamped simply supported clamped rectangular plate (SCSCRP) carrying a point mass is examined. The expressions for the kinetic, linear and non-linear strain energies are derived by taking into account the effect of the added mass on the kinetic energy and the effect of the membrane forces induced by the non-linearity on the strain energy. The discretization of these expressions makes the mass tensor, the linear and non-linear rigidity tensors appear in a non-linear algebraic multimode amplitude equation, the iterative solution of which permit to obtain, in the neighborhood of the first non-linear mode, the basic SCSCRP function amplitude dependent contribution coefficients. Nonlinear frequency response functions have been obtained for the first time, based on an iterative numerical solution in each case of the associated complete set of nonlinear algebraic equations. Such new results are useful for a better qualitative understanding allowing an optimal dynamic design of the rectangular plates with added masses.","PeriodicalId":52164,"journal":{"name":"Diagnostyka","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46058924","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: 2