Curved and Layered Structures最新文献_第4页

Nonlocal state-space strain gradient wave propagation of magneto thermo piezoelectric functionally graded nanobeam 磁热压电功能梯度纳米梁的非局域状态空间应变梯度波传播

IF 1.5

Curved and Layered Structures Pub Date : 2023-01-01 DOI: 10.1515/cls-2022-0192

R. Selvamani, Rubine Loganathan, R. Dimitri, Francesco Tornabene

引用次数: 2

A methodological approach for detecting multiple faults in wind turbine blades based on vibration signals and machine learning 一种基于振动信号和机器学习的风电叶片多故障检测方法

Curved and Layered Structures Pub Date : 2023-01-01 DOI: 10.1515/cls-2022-0214

Ahmed Ali Farhan Ogaili, Alaa Abdulhady Jaber, Mohsin Noori Hamzah

{"title":"A methodological approach for detecting multiple faults in wind turbine blades based on vibration signals and machine learning","authors":"Ahmed Ali Farhan Ogaili, Alaa Abdulhady Jaber, Mohsin Noori Hamzah","doi":"10.1515/cls-2022-0214","DOIUrl":"https://doi.org/10.1515/cls-2022-0214","url":null,"abstract":"Abstract Wind turbines generate clean and renewable energy for the international market. The most ‎‎important aspect of wind turbine maintenance is reducing failures, downtime, and operating and maintenance expenses. ‎This study aims to detect multiple faults exhibited by wind turbine blades; failures such as cracks (tip crack, mid-span crack, and crack ‎near the root) were observed in the blades at different locations. The research suggests a new approach, incorporating vibration signals and machine learning techniques to identify various failures in wind turbine blades. The technology of ranking features such as ReliefF algorithms, chi-squares, and information gains was adopted to discuss a method framework to diagnose several problems in wind turbine blades, such as cracks in different locations. The k-nearest neighbors (KNNs), support vector machines, and random forests are used to classify data based on measured vibration signals. The eight main time-domain features are calculated from the vibration signals. The proposed methodology was validated using four databases. The results showed good classification accuracy in four databases, with at least three non-conventional features in each database’s top nine features of the three classification techniques. The results also showed that when the ReliefF selection algorithm is applied with the KNN classification algorithm, it generates the highest classification accuracy under all failure conditions, and the value is 97%. Finally, the performance of the proposed classification model is compared with other machine learning classification models, and a promising result is obtained. ‎","PeriodicalId":44435,"journal":{"name":"Curved and Layered Structures","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135650000","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

Temperature-dependent mechanical properties of Al/Cu nanocomposites under tensile loading via molecular dynamics method 分子动力学方法研究拉伸载荷下Al/Cu纳米复合材料的温度相关力学性能

IF 1.5

Curved and Layered Structures Pub Date : 2022-01-01 DOI: 10.1515/cls-2022-0009

M. Abdulrehman, M. Hussein, I. Marhoon

{"title":"Temperature-dependent mechanical properties of Al/Cu nanocomposites under tensile loading via molecular dynamics method","authors":"M. Abdulrehman, M. Hussein, I. Marhoon","doi":"10.1515/cls-2022-0009","DOIUrl":"https://doi.org/10.1515/cls-2022-0009","url":null,"abstract":"Abstract Al-Cu Nanocomposites (NCs) are widely used in industrial applications for their high ductility, light weight, excellent thermal conductivity, and low-cost production. The mechanical properties and deformation mechanisms of Metal Matrix NCs (MMNCs) strongly depend on the matrix microstructure and the interface between the matrix and the second phase. The present study relies on Molecular Dynamics (MD) to investigate the effects of temperature on the mechanical properties and elastic and plastic behavior of the Al-Cu NC with single-crystal and polycrystalline matrices. The effects of heating on microstructural defects in the aluminum matrix and the Al/Cu interface were also addressed in the following. It was found that the density of defects such as dislocations and stacking fault areas are much higher in samples with polycrystalline matrices than those with single-crystal ones. Further, by triggering thermally activated mechanisms, increasing the temperature reduces the density of crystal defects. Heating also facilitates atomic migration and compromises the yield strength and the elastic modulus as a result of the increased energy of atoms in the grain boundaries and in the Al-Cu interface. The results showed that the flow stress decreased in all samples by increasing the temperature, making them less resistant to the plastic deformation.","PeriodicalId":44435,"journal":{"name":"Curved and Layered Structures","volume":"9 1","pages":"96 - 104"},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47719305","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

Numerical and experimental investigation of two phase flow geometrical characteristics 两相流几何特性的数值与实验研究

IF 1.5

Curved and Layered Structures Pub Date : 2022-01-01 DOI: 10.1515/cls-2022-0018

Hyder M. Abdul Hussein, Sabah T Ahmed, L. Habeeb

引用次数: 1

Optimization of mechanical wear resistance for recycled (Al-Mg-Si) reinforced SiC composite material using PM method PM法优化再生（Al-Mg-Si）增强SiC复合材料的机械耐磨性

IF 1.5

Curved and Layered Structures Pub Date : 2022-01-01 DOI: 10.1515/cls-2022-0023

S. Omran, M. M. Al-Masoudy, O. H. Hassoon, M. Fayad

{"title":"Optimization of mechanical wear resistance for recycled (Al-Mg-Si) reinforced SiC composite material using PM method","authors":"S. Omran, M. M. Al-Masoudy, O. H. Hassoon, M. Fayad","doi":"10.1515/cls-2022-0023","DOIUrl":"https://doi.org/10.1515/cls-2022-0023","url":null,"abstract":"Abstract Recently, the increasing demand for advanced materials around the world led to search on require and optimal materials characteristics. An alloy (Al-Mg-Si) named hindalium was used in this study which made from aluminum recycling (aluminums sandwich panel plates). In addition, powder technology was applied to investigate the effect of adding silicon carbide (SiC) particles on the composite properties that enter in fabricate of disc brake rotors. The main reason to use this technology is a single material cannot meet the demands of an extreme engineering setting that encourage towards necessitating the use of composites. Metal matrix composites are a type of material that has a lot of potential for components and structural applications that require a lot of unique modulus, strength, and durability as well as in the same time being light in weight. The composites materials of metal base with good properties are becoming now widely used in several industrial sectors due to their high mechanical properties and resistant to wear. Al-Mg-Si alloys are a common material category because of their inherent hardness, and corrosion resistance. The properties of hardness, wear rate, and microstructure are the physical and mechanical tests were performing in this study. It is indicated that the modeling with using a Genetic Algorithm is the best solution to choose the samples that have been prepared. According to the results, it was observed that the hardness increased by 14% at 15%SiC content and the wear rate decreased by 17% as comparing with the base alloy used in this study.","PeriodicalId":44435,"journal":{"name":"Curved and Layered Structures","volume":"9 1","pages":"295 - 303"},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45798634","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

Determination of the dynamic performance of natural viscoelastic composites with different proportions of reinforcing fibers 不同比例增强纤维天然粘弹性复合材料动态性能的测定

IF 1.5

Curved and Layered Structures Pub Date : 2022-01-01 DOI: 10.1515/cls-2022-0011

S. Shlykov, R. Rogulin, S. Kondrashev

{"title":"Determination of the dynamic performance of natural viscoelastic composites with different proportions of reinforcing fibers","authors":"S. Shlykov, R. Rogulin, S. Kondrashev","doi":"10.1515/cls-2022-0011","DOIUrl":"https://doi.org/10.1515/cls-2022-0011","url":null,"abstract":"Abstract Viscoelastic composites are strong and handle vibration damping quite well, which allows them to be used in a wide variety of applications. Thus, there is a need to determine the optimal amount of fiber to ensure high mechanical and dynamic performance with as little interference as possible. The purpose of this work is to find the most appropriate percentage of organic fiber – cellulose derived from corn stalks in a polylactic acid matrix, studying the changes in damping characteristics, tensile strength, bend-test. As parameters for comparison, the coefficient of bending and breaking strength, modules of accumulation and losses, factor C were chosen. It was found that strength indicators decrease with fiber fraction growth. While the damping factor at the glass transition temperature increases. In order to confirm the results obtained, the calculation of the C factor was used. The study investigates the damping factor’s dependence on the mechanical properties. It is shown that there is a correlation between moduli and bending strength with increasing fiber fraction. The scientific novelty of this work is the study of natural viscoelastic composites with different proportions of reinforcing fibers based on mechanical and dynamic characteristics in order to create and apply biodegradable viscoelastic composites in various fields.","PeriodicalId":44435,"journal":{"name":"Curved and Layered Structures","volume":"9 1","pages":"116 - 123"},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44019733","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

Mixed convection around a circular cylinder in a buoyancy-assisting flow 浮力辅助流中圆柱体周围的混合对流

IF 1.5

Curved and Layered Structures Pub Date : 2022-01-01 DOI: 10.1515/cls-2022-0008

H. S. Majdi, M. Mashkour, L. Habeeb, M. Ilic

{"title":"Mixed convection around a circular cylinder in a buoyancy-assisting flow","authors":"H. S. Majdi, M. Mashkour, L. Habeeb, M. Ilic","doi":"10.1515/cls-2022-0008","DOIUrl":"https://doi.org/10.1515/cls-2022-0008","url":null,"abstract":"Abstract In this paper, the effect of mixed convection on the flow behavior and heat transfer around a circular cylinder disclosed to a vertically upward laminar air stream is numerically examine. The buoyancy-aided flow is utilized to eliminate and control the vortex shedding of the cylinder. The influence of the Grashof number, 0 ≤ Gr ≤ 6000, the flow and thermal patterns, as well as the local and mean Nusselt number, is investigated at a constant Reynolds number of 100. The unsteady Navier-Stokes’s equations are solved employing a finite-volume method to simulate numerically the velocity and temperature fields in time and space. The results showed periodic instability in the flow and thermal fields for a range of Grashof number Gr ≤ 1300. Also, there is critical value of Grashof number for stopping this instability and the vortex shedding formed behind the cylinder, by the effect of heating. Thus, by increasing Grashof number between 1400 ≤ Gr ≤ 4000, the periodic flow vanishes and converts into steady flow with twin eddies attached to the cylinder from the back. Furthermore, as Grashof number increases behind Gr ≥ 5000, the flow becomes completely attached to the cylinder surface without any separation.","PeriodicalId":44435,"journal":{"name":"Curved and Layered Structures","volume":"9 1","pages":"81 - 95"},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47982765","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

CFD Comparison of multiphase models in the pool boiling state 池沸腾状态多相模型的CFD比较

IF 1.5

Curved and Layered Structures Pub Date : 2022-01-01 DOI: 10.1515/cls-2022-0029

Suleiman MJ. Enjadat

{"title":"CFD Comparison of multiphase models in the pool boiling state","authors":"Suleiman MJ. Enjadat","doi":"10.1515/cls-2022-0029","DOIUrl":"https://doi.org/10.1515/cls-2022-0029","url":null,"abstract":"Abstract With the development of simulation technology and programs, it became necessary to study the models that control equations’ solutions and influence the results. The models having control over solving equations of multiple phases and materials are investigated. They include (Volume of Fluid (VOF), mixture, Eulerian) controlling the governing equations. The study was conducted depending on the boiling point of the water. The activation of these three models is carried out to find out which one is better for solving the issue of boiling compared to previous numerical and empirical research with the study of the surface tension coefficient that affects the behavior of phases in a contaminated manner. The best model explored in the case of boiling is VOF for the merging of steam bubbles, the velocity of flows 0.257 m/s for both water and steam, and the phase transition. The effectiveness of the VOF model is mirrored by higher efficiency and accuracy of the solution with velocity 0.257 m/s and volume fraction 0.9997. The activation of the surface tension factor 0.072 property simulates the real conditions surrounding the materials used in boiling, but it significantly increases the turbulence and distribution of gas bubbles.","PeriodicalId":44435,"journal":{"name":"Curved and Layered Structures","volume":"9 1","pages":"382 - 389"},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42719445","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

Generate high data rate of optical carries by using nanomaterial graphene in slab waveguide 利用纳米材料石墨烯在平板波导中产生高数据速率的光载波

IF 1.5

Curved and Layered Structures Pub Date : 2022-01-01 DOI: 10.1515/cls-2022-0015

Saib Thiab Alwan, O. A. Mahmood, Tahreer Mahmood

{"title":"Generate high data rate of optical carries by using nanomaterial graphene in slab waveguide","authors":"Saib Thiab Alwan, O. A. Mahmood, Tahreer Mahmood","doi":"10.1515/cls-2022-0015","DOIUrl":"https://doi.org/10.1515/cls-2022-0015","url":null,"abstract":"Abstract Single mode is one of the most practical applications in microwave propagations because of its high mode resolution and low transmission loss. In this paper, the single mode graphene material was implemented in slab waveguide to study the performance and optical properties of graphene material; the parameters that affect these models were found to be the cut-off frequency, attenuation wavenumbers, modes numbers, skin depth, angles incident, and propagation wave numbers. The effectiveness of these factors was simulated and analyzed using MATLAB software program. In this paper, the carriers were generated using nano-graphene; the optical carrier source provided seven carriers with the frequency spacing of 4.9682 GHz. After splitting the carriers using optical demultiplexer, these carriers were modulated independently using optical Quadrature phase shift keying (QPSK) modulators at symbol rate equal to 4.9682 Gsymbol/s; this matches the frequency spacing of the carriers. Under this argument, the total data rate was equal to 2*7*4.9682 Gsymbol/s = 69.5548 Gbit/s, and the total bandwidth was 34.774 GHz. These carriers were found to work in optical communication with high data rate.","PeriodicalId":44435,"journal":{"name":"Curved and Layered Structures","volume":"9 1","pages":"187 - 192"},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47655627","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

Viscoelastic behavior of glass fiber reinforced rubber-modified epoxy 玻璃纤维增强橡胶改性环氧树脂的粘弹性行为

IF 1.5

Curved and Layered Structures Pub Date : 2022-01-01 DOI: 10.1515/cls-2022-0030

Adnan Abbass Al-Azzawi

引用次数: 0