Engineering Educator: Courses最新文献_第6页

Coupled Task Scheduling With Exact Delays: Literature Review and Models 具有精确延迟的耦合任务调度:文献综述和模型

Engineering Educator: Courses Pub Date : 2018-12-20 DOI: 10.2139/ssrn.3333563

M. Khatami, A. Salehipour, T. Cheng

引用次数: 18

Which Criteria Qualify Power Indices for Applications? A Comment to 'The Story of the Poor Public Good Index' 哪些标准符合应用的功率指数?对“糟糕的公共产品指数的故事”的评论

Engineering Educator: Courses Pub Date : 2018-12-14 DOI: 10.2139/ssrn.3301130

Sascha Kurz

引用次数: 9

Study of Stiffness and Damping Coefficients Developed in a Hydrodynamic Journal Bearing with Thin Porous Bush under Micropolar Lubrication 微极润滑下薄多孔轴瓦流体动压滑动轴承刚度和阻尼系数的研究

Engineering Educator: Courses Pub Date : 2018-12-13 DOI: 10.2139/ssrn.3328440

Ujjal Baidya, Sanjoy Das, Santanu Das

引用次数: 0

Role of Micronized PTFE Powders as Performance Additives in Meeting the Industrial Demands of Greases 聚四氟乙烯微粉作为性能添加剂在润滑脂工业需求中的作用

Engineering Educator: Courses Pub Date : 2018-12-13 DOI: 10.2139/ssrn.3349086

Ajay Mahaputra Kumar, B. Prasad, Snigdha Thummalapalli, Banti Sidhiwala, T. Gupta

{"title":"Role of Micronized PTFE Powders as Performance Additives in Meeting the Industrial Demands of Greases","authors":"Ajay Mahaputra Kumar, B. Prasad, Snigdha Thummalapalli, Banti Sidhiwala, T. Gupta","doi":"10.2139/ssrn.3349086","DOIUrl":"https://doi.org/10.2139/ssrn.3349086","url":null,"abstract":"Growth on demand and economics in some industrial segments like transport, mining, food and agriculture industries witnesses high level of automation and mechanized equipment’s. To meet the expectations of automation, zero break down and fill for life, lubricants formulators have to look for alternate additives/products to meet the ever growing performance requirements. Additives used conventionally for improving the anti-wear and extreme pressure (EP) properties are sulphur-phosphorous, molybdenum disulphide in grease formulations are reactive chemicals, have some limitations in segments like food and agriculture. Micronized PTFE powders due to their excellent slip and load bearing properties play crucial role in meeting the greases requirements both in EP greases and complex greases. Micronized PTFE powders of low molecular weight manufactured in the country which is an excellent additive for many applications including as EP additives in grease applications. In the current study, micronized PTFE powders obtained from E- Beam irradiation were fortified with grease and the synergistic effects with other EP additives in various types of grease were studied and its advantages over other EP additives are discussed and the advantages are highlighted as an alternate source of performance up grader for grease for the formulators and industrial users. ","PeriodicalId":443021,"journal":{"name":"Engineering Educator: Courses","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126118773","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

Effect of Speed on Static Performance Characteristics of Hole-Entry Hybrid Conical Journal Bearing for Different Semi Cone Angles 转速对不同半锥角孔-入口混合式圆锥滑动轴承静态性能特性的影响

Engineering Educator: Courses Pub Date : 2018-12-13 DOI: 10.2139/ssrn.3331460

P. G. Khakse, V. Phalle

引用次数: 0

Methodologies to Compare IC Engine Power Assembly Interface Materials 比较集成电路发动机动力总成接口材料的方法

Engineering Educator: Courses Pub Date : 2018-12-13 DOI: 10.2139/ssrn.3355550

M. R. Sridhar, K A Harsha, Savio Sebastian, S. Math

{"title":"Methodologies to Compare IC Engine Power Assembly Interface Materials","authors":"M. R. Sridhar, K A Harsha, Savio Sebastian, S. Math","doi":"10.2139/ssrn.3355550","DOIUrl":"https://doi.org/10.2139/ssrn.3355550","url":null,"abstract":"To meet the needs of higher power, lower weight and better emissions IC engines, component manufacturers develop new materials, coatings and surface technologies (e.g. surface texture). In this paper methodologies have been developed for comparing & ranking interface materials with custom-built rigs built in GE Global Research, Bangalore for large sized IC engines. This work will discuss the three methodologies developed using: i) Journal Bearing Rig ii) Piston-Liner Rig and the iii) Valve-seat rig. The Journal bearing Rig can be spun to engine linear speeds with lubricant heated to engine oil temperature. The loading is performed using a hydraulic system. Seizure, steady state wear and start stop tests can be performed on this rig. The piston liner rig can accommodate a section of the liner and ring from an actual engine. The combination of the pneumatic mechanism and the 2-axis load cell can load and measure the normal load & frictional load. The piston ring-liner simulates interface hot engine temperatures and contact pressures at TDC/BDC. Scuffing & wear tests can be performed with this test rig to compare scuffing limits and steady state wear rates. The valve-seat rig fixture is built within a MTS frame and can accommodate small sections of the actual engine valve and seat. Normal load and the fretting stroke is simulated using MTS hydraulic system A furnace is used around the fixture to simulate higher temperatures. Case studies comparing & ranking different coatings/repair coatings and oil additives etc. will be presented in this work to showcase the effectiveness of the methodology. Tests using this methodology can be typically performed in 10 % of time & cost of actual engine test.","PeriodicalId":443021,"journal":{"name":"Engineering Educator: Courses","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122009771","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

Need of Quality Standards for Agritourism 农业旅游质量标准的必要性

Engineering Educator: Courses Pub Date : 2018-12-11 DOI: 10.2139/ssrn.3299243

A. Bhake

引用次数: 0

An Analysis of the Intellectual Structure of Research on the Financial Economics of Precious Metals 贵金属金融经济学研究的知识结构分析

Engineering Educator: Courses Pub Date : 2018-12-02 DOI: 10.2139/ssrn.3294567

Xiangyun Gao, Shupei Huang, B. Lucey, S. Vigne, S. Corbet

引用次数: 42

Aerodynamic and Thermal Analysis of Bump Type Gas Foil Thrust Bearing for Cryogenic Helium Turboexpander 低温氦气涡轮膨胀机凹凸型气体箔型推力轴承气动与热分析

Engineering Educator: Courses Pub Date : 2018-12-01 DOI: 10.2139/ssrn.3347076

J. Kumar, Ch. Rewant, Hitesh Kumar Sinha, Suraj K Behera

{"title":"Aerodynamic and Thermal Analysis of Bump Type Gas Foil Thrust Bearing for Cryogenic Helium Turboexpander","authors":"J. Kumar, Ch. Rewant, Hitesh Kumar Sinha, Suraj K Behera","doi":"10.2139/ssrn.3347076","DOIUrl":"https://doi.org/10.2139/ssrn.3347076","url":null,"abstract":"Gas Foil Bearings (GFBs) are used for several high-speed applications for its compliant behavior to tailor its damping and stiffness. One of the high-speed application is the cryogenic turboexpander and they are used to refrigerate the gas stream in a liquefier. This article deals with the aerodynamic and thermodynamic analysis of bump type gas foil thrust bearings (BGFTBs), which are used to support the axial load of the helium turboexpander with a design speed of 2,40,000 rpm. The BGFTBs consists of very thin top and bump foils attached to the bearing base. The wedging action between the shaft collar and top foil is responsible for the development of aerodynamic pressure and this aerodynamic pressure supports the axial load of the rotor. Due to restricted converging passage for the gas flow between the collar and top foil, the process gas is likely to rise in temperature and distort the thin foils of the bearings. This paper presents a simulation method to analyze the aerodynamic and thermal behavior of the BGFTBs. The gas film is modeled using Reynold’s equation. The structural and Reynold’s equations are coupled together to predict the film thickness, pressure distribution and load carrying capacity. Further, the gas film is modeled by using an energy equation to predict the thermal characteristics. The Couette Approximation is used to predict the temperature distribution of the gas film. This approximation helps to delink the energy equation with Reynolds equation.","PeriodicalId":443021,"journal":{"name":"Engineering Educator: Courses","volume":"121 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113999637","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 Iterative Hybrid Agile Methodology for Developing Archiving Systems 归档系统开发的迭代混合敏捷方法

Engineering Educator: Courses Pub Date : 2018-11-30 DOI: 10.5121/ijsea.2019.10102

Khaled Ebrahim Almajed, Walaa Medhat, Tarek El-Shishtawy

引用次数: 1