Frontiers of Mechanical Engineering最新文献_第10页

Technical and economic evaluation of an engine and irrigation pump using a T-type mixer for natural gas 用T型天然气混合器对发动机和灌溉泵的技术经济评价

IF 4.5 2区工程技术

Frontiers of Mechanical Engineering Pub Date : 2023-01-09 DOI: 10.3389/fmech.2022.1081659

W. Elhelew, A. Abdelmaqsoud, Khaleed Faran ElBagoury, H. A. Shanan

{"title":"Technical and economic evaluation of an engine and irrigation pump using a T-type mixer for natural gas","authors":"W. Elhelew, A. Abdelmaqsoud, Khaleed Faran ElBagoury, H. A. Shanan","doi":"10.3389/fmech.2022.1081659","DOIUrl":"https://doi.org/10.3389/fmech.2022.1081659","url":null,"abstract":"Energy is regarded as one of the most crucial resources in the industrial process. Numerous measurements were made in the year 2021 in the workshops of the Agricultural Engineering Department, Faculty of Agriculture, Ain Shams University, Egypt, using a gasoline engine (single cylinder with air-cooling) that was used to power an irrigation pump with a discharge diameter of 2 inches, which was manufactured in Egypt. To combine natural gas and air before entering the engine, a variety of mixers were created. Four different types of mixers were employed with iron pipes of various sizes: 90° angle T-mixer (T90), 45° angle T-mixer (T45), 30° angle T-mixer (T30), and venture mixer (VM). The engine shift speeds were set at 1,750, 2,300, 2,900, and 3,500 rpm. The water pump was powered by natural gas and gasoline. The findings in this study focused on the evaluation of technical indicators for several types of mixers that combine natural gas and air to power an irrigation pump, where the actual power (braking power) is superior to all types while operating with gasoline (3.07 kW). A commensurability on every side the report of on the up steam, in the mixer type (T45) (2.83 kW) was 7.8% about than gasoline. The lowest specific fuel consumption (S.fc) for gasoline was 219.025 gm/Kw.h at an engine speed of 2,900 rpm. The T45 mixer had the lowest S.fc of 234.612 gm/KW.h, compared with other types of mixers at an engine speed of 2,900 rpm, an increase of 6.6% compared with gasoline. The T45 mixer had the highest pump discharge of 528.133 L/min, an increase of 2.1% compared with gasoline. Compared with other types of T-mixers, the T45 mixer had the highest actual hydraulic power of 0.6 kW, which was 10.5% lower than that of gasoline. As for the economic indicators, the T90 mixer had the lowest net present value (NPV) of 77219.5, and the T45 mixer had the highest NPV of 106900.7. The mixer-type VM had the lowest benefit–cost ratio (B/C) of 1.38, and the T45mixer had the highest B/C of 1.54.","PeriodicalId":48635,"journal":{"name":"Frontiers of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2023-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49323368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Film-cooling hole optimization and experimental validation considering the lateral pressure gradient 考虑侧向压力梯度的薄膜冷却孔优化及实验验证

IF 4.5 2区工程技术

Frontiers of Mechanical Engineering Pub Date : 2023-01-09 DOI: 10.3389/fmech.2022.973293

Hao Zhang, J. Gou, Peng Yin, Xinrong Su, Xin Yuan

引用次数: 2

Environmental particle rebound/deposition modeling in engine hot sections 发动机热段的环境颗粒反弹/沉积建模

IF 4.5 2区工程技术

Frontiers of Mechanical Engineering Pub Date : 2023-01-05 DOI: 10.3389/fmech.2022.924755

Leiyong Jiang, P. Trembath, P. Patnaik, M. Capurro

{"title":"Environmental particle rebound/deposition modeling in engine hot sections","authors":"Leiyong Jiang, P. Trembath, P. Patnaik, M. Capurro","doi":"10.3389/fmech.2022.924755","DOIUrl":"https://doi.org/10.3389/fmech.2022.924755","url":null,"abstract":"The aircraft engine hot section is most vulnerable and failure prone to environmental particle ingestion, which, particularly for helicopters, can cause detrimental effects ranging from reduced performance to complete engine failure. The objective of this work is to develop an analytical tool to assess environmental particle impact on engine hot sections. The current state of the art in experimental and analytical research on environmental particle ingestion related to engine hot sections was reviewed, with emphasis on sand particles. From these efforts, the available experimental data for model calibration were identified, and an innovative particle rebound/deposition model has been developed. A semi-empirical approach is selected to model particles bouncing off metal surfaces, where the coefficients of restitution measured in a temperature range of 297–1323 K are used to calculate particle bounce-back velocity components. The developed deposition model is based on non-dimensional parameter analysis over more than seventy experiments related to particle deposition in engine hot sections. The metal surface temperature, one of two critical parameters in particle deposition, is also included in the model. The model was successfully implemented into commercial software and checked step by step. It was calibrated by two cases: sand [Arizona road dust (ARD)] particle impingement on a circular plate and Mt. St. Helens volcanic ash impinging on a first-stage air-cooled nozzle guide vane (NGV). For the former case, the calibrated model predicts fairly well the variation of particle deposition rate with flow/particle temperature. The latter case indicates that the particle deposition rate at engine operating conditions can be assessed by the developed model. Due to the lack of experimental data that would permit a full calibration/validation, for the time being the model can be only used under limited conditions. As additional relevant experimental data appears, the model will be continuously improved.","PeriodicalId":48635,"journal":{"name":"Frontiers of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42428862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Numerical calculation of a 20MN heavy duty hydraulic press for analyzing the double frame pre-stressed steel wire winding 20MN重型液压机双框架预应力钢丝缠绕分析的数值计算

IF 4.5 2区工程技术

Frontiers of Mechanical Engineering Pub Date : 2023-01-04 DOI: 10.3389/fmech.2022.1086124

Yumin Zhang, Xigui Wang, Yongmei Wang

{"title":"Numerical calculation of a 20MN heavy duty hydraulic press for analyzing the double frame pre-stressed steel wire winding","authors":"Yumin Zhang, Xigui Wang, Yongmei Wang","doi":"10.3389/fmech.2022.1086124","DOIUrl":"https://doi.org/10.3389/fmech.2022.1086124","url":null,"abstract":"The expected preloading effect of a hydraulic press frame parts (upper/lower semi-circular beams and columns) with pre-stressed by means of Winding Steel Wires which is directly related to the reliability and normal safe operation of the hydraulic press. The deformation of the Hydraulic Press Column (HPC) is an important indicator of the optimal preloading effect of the hydraulic press. A novelty of this project is to break through a bottleneck technology, the continuous cumulative deformation of a Hydraulic Press Column under seven time-varying steps is critical issues especially in theoretically calculated for a 20 MN double-frame hydraulic press with pre-stressed using WAW. A solid model with a pre-stressed frame is pre-designed by 3D software, and two simulation methods, equivalent pressure loading and equivalent temperature loading, are used to simulate and analyze the continuous cumulative deformation of the HPC under each step in Ansys Workbench software. By comparing the deformation and error analysis in the three cases above, the feasibility of the two simulation methods is verified, which leads to the advantages and disadvantages of each method in order to guide the subsequent design.","PeriodicalId":48635,"journal":{"name":"Frontiers of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2023-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47694369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

The world is burning: What exactly are firebrands and why should anyone care? 世界正在燃烧:到底什么是火种，为什么人们应该关心?

IF 4.5 2区工程技术

Frontiers of Mechanical Engineering Pub Date : 2023-01-04 DOI: 10.3389/fmech.2022.1072214

S. Manzello, Sayaka Suzuki

{"title":"The world is burning: What exactly are firebrands and why should anyone care?","authors":"S. Manzello, Sayaka Suzuki","doi":"10.3389/fmech.2022.1072214","DOIUrl":"https://doi.org/10.3389/fmech.2022.1072214","url":null,"abstract":"Large outdoor fires have become commonplace all over the world. The International Organization for Standardization (ISO) defines large outdoor fires as an urban fire, tsunami-generated fire, volcano-generated fire, wildland-urban interface (WUI) fire, wildland fire, or informal settlement fire, where the total burnout area is significant. Perhaps of all the large outdoor fires, it is wildland fires that spread into urban areas, simply called WUI fires that attract the most attention. A glance at the recent headlines in the summer of 2022 reveals numerous catastrophic WUI fires all over Europe. Across the Atlantic Ocean in the USA, there is yet another destructive WUI fire raging in the USA state of California. With the increasing risks from a changing climate, these large outdoor fire disasters are only going to become more and more commonplace all over the world. More homes will be lost and more lives will be lost. It is the authors opinion that a targeted, multi-disciplinary approach is needed to address the large outdoor fire problem. In this short, invited paper to Horizons in Mechanical Engineering, it is argued that large outdoor fire problem is a fascinating and challenging research area and that engineers have the necessary skills and training to impact a problem that influences millions upon millions of people all over the world. An important danger, present in all large outdoor fires, are firebrands. Firebrands are introduced for non-specialist readers, and the most recent literature is reviewed. Several challenges are discussed, in particular, areas where engineers may help move the needle forward on this globally important topic.","PeriodicalId":48635,"journal":{"name":"Frontiers of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2023-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45748492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Editorial: Structural integrity and durability of engineering materials and components 社论：工程材料和部件的结构完整性和耐久性

IF 4.5 2区工程技术

Frontiers of Mechanical Engineering Pub Date : 2023-01-04 DOI: 10.3389/fmech.2022.1124104

D. Benasciutti, J. Correia, S. Abdullah, J. Papuga

{"title":"Editorial: Structural integrity and durability of engineering materials and components","authors":"D. Benasciutti, J. Correia, S. Abdullah, J. Papuga","doi":"10.3389/fmech.2022.1124104","DOIUrl":"https://doi.org/10.3389/fmech.2022.1124104","url":null,"abstract":"Engineering components and structural details may be subjected in service to quite different loading conditions: high-cycle or low-cycle fatigue (with constant or variable amplitudes), static loadings and/or overloads, vibrations, creep, stress corrosion–just to cite a few examples. Whatever the loading condition, an assessment of the structural integrity for a structural detail must ensure an adequate safety margin against unexpected failures with potential catastrophic consequences. This goal is pursued by the use of theoretical, numerical and experimental approaches, often combined. For example, laboratory tests to estimate fundamental material properties, or full-scale tests to validate a finite element analysis implementing suitable strength models. Most often, scientific research deals with each of these areas separately, by proposing unconventional strength criteria, developing numerical techniques, or testing the durability of specific categories of traditional and advanced materials. The four papers of this Research Topic address some of the above-mentioned Research Topic by means of theoretical and/or experimental studies that cover application areas from mechanical to civil engineering. The paper by Gaidai et al. presents an approach to predict the extreme response in the mooring system of a floating wind turbine (FWT) based on extreme value statistics and a bivariate correction approach. As a case study, the approach is applied to a 10 MW large three-bladed FWT. The fully coupled aero-hydro-elastic-servo dynamic analysis of the FWT is performed by the open source simulation tool FAST (Fatigue, Aerodynamics, Structures and Turbulence). The FAST tool computed the aerodynamic loads on the blades and hydrodynamic loads on semi-submersible floater, other than the structural dynamic response, and eventually returned the time series of anchor tension force and surge motion of the wind turbine under different operation conditions, to be processed in the OPEN ACCESS","PeriodicalId":48635,"journal":{"name":"Frontiers of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2023-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43141580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Advances in polishing of internal structures on parts made by laser-based powder bed fusion 激光粉末床熔合加工零件内部结构抛光的研究进展

IF 4.5 2区工程技术

Frontiers of Mechanical Engineering Pub Date : 2023-01-01 DOI: 10.1007/s11465-022-0724-0

M. Shen, F. Fang

引用次数: 1

Lightweight design of an electric bus body structure with analytical target cascading 基于分析目标级联的电动客车车身结构轻量化设计

IF 4.5 2区工程技术

Frontiers of Mechanical Engineering Pub Date : 2023-01-01 DOI: 10.1007/s11465-022-0718-y

Puyi Wang, Y. Bai, Chuanliang Fu, Cheng Lin

引用次数: 1

New nonlinear stiffness actuator with predefined torque—deflection profile 具有预定义力矩-挠度轮廓的新型非线性刚度致动器

IF 4.5 2区工程技术

Frontiers of Mechanical Engineering Pub Date : 2023-01-01 DOI: 10.1007/s11465-022-0721-3

Wenjie Ju, Hexi Gong, Keke Qi, Rongjie Kang, J. Dai, Zhibin Song

引用次数: 1

Vibration characteristics and machining performance of a novel perforated ultrasonic vibration platform in the grinding of particulate-reinforced titanium matrix composites 新型穿孔超声振动平台在颗粒增强钛基复合材料磨削中的振动特性和加工性能

IF 4.5 2区工程技术

Frontiers of Mechanical Engineering Pub Date : 2023-01-01 DOI: 10.1007/s11465-022-0730-2

Yang Cao, B. Zhao, W. Ding, Qiang Huang

引用次数: 0