Engineering Review最新文献_第9页

A medium frequency transformer design for spot welding machine using sizing equation and finite element analysis 利用尺寸方程和有限元分析对点焊机中频变压器进行了设计

IF 0.4

Engineering Review Pub Date : 2020-05-21 DOI: 10.30765/er.40.3.05

S. Arslan, I. Tarimer, M. E. Güven, S. A. Oy

引用次数: 1

Solving multi-objective supplier selection and quota allocation problem under disruption using a scenario-based approach 基于场景的方法求解多目标供应商选择和配额分配问题

IF 0.4

Engineering Review Pub Date : 2020-05-21 DOI: 10.30765/er.40.3.08

Farnaz Javadi Gargari, M. Seifbarghy

{"title":"Solving multi-objective supplier selection and quota allocation problem under disruption using a scenario-based approach","authors":"Farnaz Javadi Gargari, M. Seifbarghy","doi":"10.30765/er.40.3.08","DOIUrl":"https://doi.org/10.30765/er.40.3.08","url":null,"abstract":"Nowadays, experts believe there are abundant sources of risks in a supply chain. An important group of risks against a supply chain is the disruption risks group, which disturbs the flow of material in the chain and may lead to inefficiency in providing the final product in the supply chain. The aim of this article is to investigate the control of costs of disruption in a supply chain by considering the possibility of disruption. In fact, this research focuses on determining the best combination of suppliers and quota allocation with regards to disruption in suppliers. The proposed multi-objective mathematical model in this paper is a mixed-integer programming (MIP) model with objective functions to minimize transaction costs of suppliers, expected costs of purchasing goods, expected percentages of delayed products, expected returned products, and to maximize expected evaluation scores of the selected suppliers. Due to the uncertainty of demand and supplier disruption in the real world, their values are also considered uncertain; the proposed multi-objective model is studied by using a scenario-based stochastic programming (SP) method. In this method, all possible predictions for demand and disruption values are simultaneously included in the model; objective function results have more optimal value than a separate solution of the model for each predicted value.","PeriodicalId":44022,"journal":{"name":"Engineering Review","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.30765/er.40.3.08","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44368697","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

A new approach for evaluating the resistance of wheel steel to spall formation 一种评估车轮钢抗剥落能力的新方法

IF 0.4

Engineering Review Pub Date : 2020-04-01 DOI: 10.30765/er.40.2.08

T. Lenkovskiy, A. Glazov, V. Kulyk, Z. Duriagina, A. Dzyubyk, R. Kovalchuk, Volodymyr Topilnytskyy, L. Dzyubyk, V. Vira

引用次数: 0

Auto-ignition performance of an electrified microreactor with constructal geometries 具有结构几何形状的电气化微反应堆的自燃性能

IF 0.4

Engineering Review Pub Date : 2020-04-01 DOI: 10.30765/ER.40.2.06

A. A. Dare, E. O. Ige, Olukunle Cornelius Akinpelu

{"title":"Auto-ignition performance of an electrified microreactor with constructal geometries","authors":"A. A. Dare, E. O. Ige, Olukunle Cornelius Akinpelu","doi":"10.30765/ER.40.2.06","DOIUrl":"https://doi.org/10.30765/ER.40.2.06","url":null,"abstract":"Common techniques employed to minimize ignition energy of gaseous fuels in micro reactors such as the use of catalyst are being plagued with setbacks. This report demonstrates the use of electric field to sustain combustion, minimize heat loss and enhance reactant mixing in microchannels of varying geometries. We set two defining constructal parameters for serpentine and straight microchannels of 0.05 to 0.25 to investigate geometric effect on the mixing of the reactants. Inlet concentration of propane and oxygen was set at 0.15 mol/dm3 and 0.7 mol/dm3 respectively. Reynolds numbers 400, 470, 530, 600 and 670 corresponding to inlet velocities of 0.06 m/s, 0.07 m/s, 0.08 m/s, 0.09 m/s and 0.1 m/s were used in the straight channel to study the dependence of reaction rate, temperature drop and reactants diffusion on the combustion process. We report that at an inlet temperature of 500 K which was below the propane’s auto ignition temperature of 743 K, the reaction could occur in the presence of a 50 V applied voltage. Increasing constructual parameter (β) yielded an increase in reaction rate and a decrease in temperature drop. At the same constructual parameter, the serpentine geometry displayed a better result with the peak reaction rate of 894 mol/m3s. More so, increase in the Reynolds number and shape factor for the two geometries led to an increase in reaction rate and propane consumption. These findings could be suitably beneficial to provide minimal fuel requirement for miniaturized vehicles and micro-heat engines","PeriodicalId":44022,"journal":{"name":"Engineering Review","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.30765/ER.40.2.06","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45543779","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

Reduction in wind force in relation to corner design of bridge piers 与桥墩转角设计相关的风力减小

IF 0.4

Engineering Review Pub Date : 2020-04-01 DOI: 10.30765/er.40.2.10

Ivana Štimac Grandić, D. Grandic

引用次数: 0

Strength, micro-structure & durability investigations of lateritic concrete with palm kernel shell (PKS) as partial replacement of coarse aggregates 棕榈仁壳(PKS)部分替代粗集料红土混凝土的强度、微观结构及耐久性研究

IF 0.4

Engineering Review Pub Date : 2020-04-01 DOI: 10.30765/ER.40.2.07

C. Fapohunda, H. Bello, Taiwo Salako, Suaib Tijani

{"title":"Strength, micro-structure & durability investigations of lateritic concrete with palm kernel shell (PKS) as partial replacement of coarse aggregates","authors":"C. Fapohunda, H. Bello, Taiwo Salako, Suaib Tijani","doi":"10.30765/ER.40.2.07","DOIUrl":"https://doi.org/10.30765/ER.40.2.07","url":null,"abstract":"This paper presents the results of investigation conducted to evaluate structural performance of lateritic concrete containing palm kernel shell (PKS) as partial replacement of coarse aggregate by weight. The properties evaluated were: workability, density, compressive strength, microstructure, sorptivity, and water absorption of lateritic concrete with PKS specimens. The coarse aggregate fraction of the lateritic concrete was partially replaced with PKS of up to 50% at interval of 10% by weight. The results showed that: (i) the use of PKS to partially replace the coarse aggregate in lateritic concrete resulted in harsh concrete with low workabilities, (ii) lateritic concrete with PKS as partial replacement of coarse aggregate of up to 50% developed densities that can be used for normal concrete application, (iii) lateritic concrete with PKS as partial replacement of coarse aggregate of up to 10% developed strength that is comparable to the specimens without PKS, (iv) the SEM images of lateritic concrete samples showed a progressively porous internal structure with PKS and (v) lateritic concrete with PKS as partial replacement of coarse aggregate results in porous material but became less porous at longer curing ages. It can be concluded from these results that the replacement of the coarse aggregate constituent with PKS by weight not exceeding 10%, in the production of lateritic concrete, resulted in a material with satisfactory structural performance.","PeriodicalId":44022,"journal":{"name":"Engineering Review","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47475488","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

Evaluation of the effects of waste glass in asphalt concrete using the Marshall test 马歇尔试验评价废玻璃在沥青混凝土中的作用

IF 0.4

Engineering Review Pub Date : 2020-04-01 DOI: 10.30765/er.40.2.04

O. Ogundipe, E. S. Nnochiri

{"title":"Evaluation of the effects of waste glass in asphalt concrete using the Marshall test","authors":"O. Ogundipe, E. S. Nnochiri","doi":"10.30765/er.40.2.04","DOIUrl":"https://doi.org/10.30765/er.40.2.04","url":null,"abstract":"The study investigates the use of waste glass as filler in asphalt concrete. Waste glass constitutes a significant proportion of the waste generated in both developed and developing countries. Successful utilization of the waste glass in asphalt will reduce the problem faced by environmental agencies at ensuring safe disposal of the non-biodegradable waste and may improve the asphalt properties. In the study, a waste glass in form of a filler was introduced into the asphalt mix at 8%, 10%, 12%, 14%, 16%, 18% and 20% of the total mix. The asphalt concrete samples with and without waste glass as filler were subjected to the Marshall test to determine the stability, flow, air voids, void in mix aggregate and void filled with bitumen. The Marshall test results show that stability increases when increasing glass filler up to 18%, although the values were lower than of the asphalt concrete without waste glass. This implies improved resistance to fatigue for higher waste glass content. Also, the flow increases with increasing glass filler, which implies the resistance to permanent deformation which did not improve. Generally, the introduction of waste glass in the asphalt concrete is environmentally friendly, and it will aid the sustainable management of waste glass.","PeriodicalId":44022,"journal":{"name":"Engineering Review","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.30765/er.40.2.04","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49449988","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: 8

Conditions and triggers of landslides on flysch slopes in Istria, Croatia 克罗地亚伊斯特里亚复理石边坡滑坡的条件和诱因

IF 0.4

Engineering Review Pub Date : 2020-04-01 DOI: 10.30765/er.40.2.09

S. Jovancevic, J. Rubinić, Ž. Arbanas

{"title":"Conditions and triggers of landslides on flysch slopes in Istria, Croatia","authors":"S. Jovancevic, J. Rubinić, Ž. Arbanas","doi":"10.30765/er.40.2.09","DOIUrl":"https://doi.org/10.30765/er.40.2.09","url":null,"abstract":"The paper gives a review of conditions and triggers in which landslides occur on flysch slopes in central and northern Istria. The north-eastern part of the Istrian Peninsula, the so-called Gray Istria, consists of Paleogene flysch rock mass. Landslides in this area are usually triggered by heavy rainfall together with human activity which changes slope geometry and assists in retaining surface water in the sliding zone. Briefly, hydrogeological conditions in combination with ground water levels and pore water pressures increase, lead to numerous instability phenomena, during the long and continuous rainfall periods. Instabilities usually include small rotational and translational landslides, and it is seldom that debris flows and rock falls occur. Landslides are evenly evidenced in the first part of winter and the early spring time which corresponds to the second rainfall peak. The analyses performed based on landslide documentation and rainfall historical data, show rainfall trends associated with landslide occurrence. Depending on meteorological, hydrological and geological conditions, cumulative rainfall which triggered landslide activation varies inside a three-month period. The results presented show rainfall trends which serve as characteristic landslide triggers on flysch slopes in north-eastern part of Istria.","PeriodicalId":44022,"journal":{"name":"Engineering Review","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.30765/er.40.2.09","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45336578","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

Improvement of flexible rotor/active magnetic bearings system performance using pi-d control 利用pi-d控制改善柔性转子/主动磁轴承系统性能

IF 0.4

Engineering Review Pub Date : 2020-04-01 DOI: 10.30765/er.40.2.12

A. Muminović, Sanjin Braut, Adil Muminović, Isad Saric, Goranka Štimac Rončević

引用次数: 0

Bubble evolution in the titanium alloy melt under vertical centrifugal field 钛合金熔体在垂直离心力场作用下的气泡演化

IF 0.4

Engineering Review Pub Date : 2020-04-01 DOI: 10.30765/er.40.2.03

Qin‐Qin Xu, Xing Wang, Shi-ping Wu

{"title":"Bubble evolution in the titanium alloy melt under vertical centrifugal field","authors":"Qin‐Qin Xu, Xing Wang, Shi-ping Wu","doi":"10.30765/er.40.2.03","DOIUrl":"https://doi.org/10.30765/er.40.2.03","url":null,"abstract":"The bubble evolution in the liquid titanium melt under vertical centrifugal field has been studied by the hydraulic experiment simulation. The bubble migration process in the simple and complex cavities, the bubble morphology, bubble dimensional size diversification under different mould rotational speed has been investigated. The results show that the mould wall has a blocking effect on the bubble migration. The bubble migration in the simple cavity deviates from the line between the bubble initial position and the rotation shaft of the casting mould. Also, the bubbles in the complex cavity gather, re-nucleate and form new big ones for the blocking effect of the complex geometry shape on the radial movement of the bubble. The shape of bubbles in both the simple and complex cavity during the migration process is not a perfect sphere, but an elliptical shape. The critical size of bubble released from the bubble generation chamber decreases with the increment of the mould rotational speed. The diameter of the gas bubbles in the simple cavity during the migration process become bigger and bigger for the pressure difference at different positions of the cavity in the vertical centrifugal field.","PeriodicalId":44022,"journal":{"name":"Engineering Review","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46873978","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