Fatigue stress analysis of the DV-2 engine turbine disk

2019 ◽  
Vol 91 (4) ◽  
pp. 708-716 ◽  
Author(s):  
Jozef Čerňan ◽  
Karol Semrád ◽  
Katarína Draganová ◽  
Miroslava Cúttová
Keyword(s):  
Development Program ◽  
Software Tool ◽  
Aircraft Engine ◽  
Turbine Disk ◽  
Jet Engines ◽  
Jet Engine ◽  
Content Type ◽  
History Of ◽  
Residual Fatigue ◽  
Aviation Engines

Purpose The purpose of this study is to improve life prediction of certain components. Fatigue of the high-stressed structural elements is an essential parameter that affects the lifetime of such components. In particular, aviation engines are devices whose failure due to fatigue failure of one of the important components can lead to fatal consequences. Design/methodology/approach In this study, two analyses in the turbine disk of the jet engine during the simulated operating load were performed: The first one was the analysis of the heat-induced stresses using the finite element method. The goal of the second analysis was to determine the residual fatigue strength of a loaded disk by the software tool using the Palmgren - Miner Linear Damage Theory. Findings The results showed a high degree of similarity with the real tests performed on the aircraft engine and revealed the weak points in the design of the jet engine. Research limitations/implications It should be mentioned that without appropriate experiments, results of this analysis could not be verified. Practical implications These results are helpful in the re-designing of the jet engines to increase their technical feasibility. Originality/value Such analysis has been realized in the DV-2 jet engine research and development program for the first time in the history of jet engine manufacturing process in Slovakia and countries of Eastern Europe region.

scholarly journals THE EFFECT OF BIOFUEL ADDITION TO FLIGHT KEROSENE ON A RUBBER GASKET / BIOKURO PRIEMAIŠŲ, DEDAMŲ Į AVIACINĮ ŽIBALĄ, POVEIKIS GUMINIAMS REAKTYVINIŲ VARIKLIŲ TARPIKLIAMS / ВЛИЯНИЕ ПРИМЕНЕНИЯ ПРИМЕСИ БИОТОПЛИВА В АВИАЦИОННОМ КЕРОСИНЕ НА РЕЗИНОВЫЕ ПРОКЛАДКИ РЕАКТИВНЫХ ДВИГАТЕЛЕЙ

Transport ◽  
2011 ◽  
Vol 26 (1) ◽  
pp. 106-110 ◽  
Author(s):  
Milan Olšovský ◽  
Marián Hocko
Keyword(s):  
Mechanical Properties ◽  
Physical Properties ◽  
Total Concentration ◽  
Methyl Esters ◽  
Aircraft Engine ◽  
Alternative Fuel ◽  
Jet Engines ◽  
Rubber Gasket ◽  
Jet Engine ◽  
Aircraft Fuel

This paper solves a problem of using unconventional fuels for driving jet engines. The carried out experiments were aimed at assessing the possibilities of using various contributions of MERO (methyl esters of rapseed oil) biofuel mixed with Jet A-1 aircraft fuel and for analyzing the influences of using an alternative fuel exerted upon the selected parts of the jet engine. The authors of the article compare the effect of adding bio-ingredients (MERO) to Jet A-1 aircraft fuel on the properties of rubber sealings used in the aircraft engine. The physical properties of MERO bio-ingredients and Jet A-1 aircraft fuel are very similar. The conducted research has discovered additional options of mixing MERO biofuel and Jet A-1 aircraft fuel and demonstrated that the total concentration (0–100%) of MERO biofuel in Jet A-1 aircraft fuel reaches a process of creating of a homogeneous mixture without sediments or coagulants. The evaluated results indicate that the appendage of the methyl esters of rapseed oil in Jet A-1 aircraft fuel give out a relatively large slump in physical-mechanical properties within the period of a few days. The raising content of MERO in aircraft fuel is bulking samples and makes itself felt by increasing the weight of the samples. Santrauka Straipsnyje nagrinėjama netradicinių kuro rūšių naudojimo reaktyviniuose varikliuose problema. Atlikti bandymai įvertino galimybes naudoti Jet A-1 aviacinį žibalą su RME (rapsų metilo esterių) biokuru. Analizuojama alternatyvaus kuro įtaka pasirinktoms reaktyvinio variklio dalims. Autoriai lygina Jet A-1aviacinio žibalo su RME biokuru, poveikį guminių tarpiklių, naudojamų reaktyviniuose varikliuose, savybėms. Fizinės RME biokuro ir Jet A-1 aviacinio žibalo savybės yra labai panašios. Atlikti tyrimai atskleidė papildomų galimybių, derinant RME biokurą ir Jet A-1 aviacinį žibalą, bei parodė, kad bendra RME biokuro koncentracija (0÷100%) Jet A-1 aviaciniame žibale sudaro vientisą mišinį be nuosėdų ir koaguliantų. Rezultatai rodo, kad per kelias dienas RME biokuro priedai, esantys Jet A-1 aviaciniame žibale, santykiškai pablogina reaktyvinių variklių guminių tarpiklių fizines ir mechanines savybes. Резюме В статье решается проблема использования нестандартных видов топлива для тяги авиационных реактивных двигателей. Целью проведённых экспериментов являлось обсуждение возможности использования смеси авиационного керосина Jet A-1 и биотоплива MERO (methylester of Rapsol Oil) в качестве альтернативного топлива, а также анализ ее влияния на определенные элементы реактивных двигателей. Авторы исследовали влияние концентрации биотоплива MERO в авиационном керосине Jet A-1 на свойства резиновых прокладок, применяемых в реактивных двигателях. Физические свойства этого биотоплива и авиационного керосина аналогичны. В течение исследования выяснилось, что при всех концентрациях биотоплива MERO (0÷100 %) и керосина Jet A-1возникает однородная смесь без осадков и коагулятов. Результаты исследований (измерений) показали, что примесь биотоплива MERO в авиационный керосин Jet A-1 повлекла за собой относительно большое изменение физико-механических свойств резиновых прокладок реактивных двигателей уже в течение нескольких дней. С увеличением доли биотоплива MERO в смеси повышается также интенсивность негативного влияния на резиновые прокладки.

scholarly journals Not So Simple Machines

2013 ◽  
Vol 135 (01) ◽  
pp. 30-35
Author(s):  
Lee S. Langston
Keyword(s):  
Gas Turbines ◽  
Jet Engines ◽  
Engineering Technology ◽  
Commercial Aviation ◽  
Jet Engine ◽  
Simple Machines ◽  
History Of ◽  
Extensive Program ◽  
Four Square ◽  
Bypass Ratio

This article talks about evolving technologies in making efficient gears for different auto engines. Gears are integral to a new engine that has the potential to change commercial aviation. Pratt & Whitney’s geared turbofan (GTF) jet engine will have significantly better fuel economy and much quieter operation. The P&W GTF combines existing jet engine technology with the well-established mechanical engineering technology of gears. Due to its high bypass ratio, the geared turbofan engine is 16% more efficient than standard jet engines. A key facility for developing the GTF gearbox has been a specially designed four-square gear test rig at P&W’s Middletown plant. The orientation of the GTF test gearboxes can be adjusted with respect to gravity to simulate different flight conditions. After an extensive program using a four-square rig and a long history of gearbox experience associated with their very popular turboprop gas turbines at Pratt & Whitney Canada, P&W engineers are convinced their new GTF engines will have a bright future.

Design, Development and Applications of Jet Engine Based 800-kW Gas Turbine

1974 ◽  
Author(s):  
J. Sinai ◽  
J. Rozewicz
Keyword(s):  
Gas Turbine ◽  
Mechanical Design ◽  
Development Program ◽  
Aircraft Engine ◽  
Operational Experience ◽  
Design Development ◽  
Gas Generator ◽  
Jet Engine ◽  
Industrial Complexes ◽  
Airport Terminals

This paper describes the design and test work of a development program of a 800-kW industrial gas turbine utilizing a jet engine gas generator. Design and subsequent manufacture of the power turbine assembly was predicated upon the use of aircraft engine components and technology. The gas turbine was initially intended as standby electric power source. It is planned to utilize the unit in continuous duty service. Solution of aerodynamic and mechanical design problems, and adaptation of control system are outlined. The results of prototype tests are also reported. Performance data correlated well with expected values. Several units have been installed up to date for standby utility service in industrial complexes, airport terminals and on ships. Operational experience with these engines is reviewed.

scholarly journals Ultrahigh-Temperature Materials for Jet Engines

MRS Bulletin ◽  
2003 ◽  
Vol 28 (9) ◽  
pp. 622-630 ◽  
Author(s):  
J.-C. Zhao ◽  
J. H. Westbrook
Keyword(s):  
Platinum Group Metal ◽  
Jet Engines ◽  
High Melting Point ◽  
Jet Engine ◽  
Thermal Barriers ◽  
Introductory Article ◽  
History Of ◽  
Ultrahigh Temperature ◽  
The Individual

AbstractThis introductory article provides the background for the September 2003 issue ofMRS Bulletinon Ultrahigh-Temperature Materials for Jet Engines. It covers the need for these materials, the history of their development, and current challenges driving continued research and development. The individual articles that follow review achievements in four different material classes (threein situcomposites—based on molybdenum silicide, niobium silicide, and silicon carbide, respectively—and high-melting-point platinum-group-metal alloys), as well as advances in coating systems developed both for oxidation protection and as thermal barriers. The articles serve as a benchmark to illustrate the progress made to date and the challenges ahead for ultrahigh-temperature jet-engine materials.

A tribute to Gwen Leighty

2006 ◽  
Vol 19 (2) ◽  
pp. 84-86
Author(s):  
Jennifer Paustenbaugh
Keyword(s):  
Web Sites ◽  
Academic Libraries ◽  
Design Methodology ◽  
Fund Raising ◽  
Personal Knowledge ◽  
Valuable Contribution ◽  
Content Type ◽  
History Of ◽  
Development Network ◽  
Fund Raiser

PurposeThe purpose of the paper is to provide a tribute to the life and work of library fund‐raiser Gwen Leighty.Design/methodology/approachThe paper uses personal knowledge and references to Academic Libraries Advancement and Development Network (ALADN) and LIBDEV web sites.FindingsThe paper finds that fundraising is connecting with people and the journey that each development officer must make while raising funds for their library.Originality/valueThe paper presents a brief history of ALADN and the valuable contribution one person made to the cause of library fund‐raising.

The sediment of the Hostivar Reservoir (Prague, Czech Republic) as a memory of 45 years of pollution

2017 ◽  
Vol 28 (2) ◽  
pp. 204-213
Author(s):  
Lucie Soucková ◽  
Dana Kominkova
Keyword(s):  
Czech Republic ◽  
Design Methodology ◽  
Polyaromatic Hydrocarbons ◽  
Reservoir Sediment ◽  
Terrestrial Environment ◽  
Content Type ◽  
Sediment Extraction ◽  
History Of ◽  
Us Epa ◽  
Practical Implications

Purpose The purpose of this paper is to evaluate the historical pollution of the Hostivar Reservoir (largest reservoir in Prague) sediment by metals, polyaromatic hydrocarbons (PAH) and polychlorinated biphenyls (PCB) and identify the trends in pollution of aquatic environment. Design/methodology/approach Core samples, 140 cm long, recording the 45-year history of the reservoir, were separated to 5 cm width subsamples (approximately 1.5 years of sedimentation) and analyzed for metals (Cd, Pb, Cu, Zn, Cr, Ni, Al), PAH and PCB. Following methods were used: US EPA 3051 for metals, US EPA 505 and US EPA 8082 A for PCB, and ISO 18287:2006 for PAH. Findings Most of the contaminants had the highest concentration at the beginning of the existence of the reservoir, suggesting that the contamination results from construction activities. Significant decrease of Pb occurred in the second half of the 1990s. It was caused by termination of the addition of lead as a detonation suppressant to the gasoline. Most concentrations of PAHs, PCBs and metals, except copper do not present eco-toxicological risk. Practical implications The results show the volume of priority pollutants removed from the reservoir by sediment extraction, and point risk to the terrestrial environment due to application of the sediment in the construction of a noise protecting wall. Originality/value The paper presents unique data about historical contamination of the largest reservoir in Prague, the capital of Czech Republic. It shows how the watershed and the construction phase of the dam cause a pollution of the reservoir sediment and possible environmental risk for aquatic biota.

A brief history of small business in Australia, 1970-2010

2014 ◽  
Vol 3 (2) ◽  
pp. 222-236 ◽  
Author(s):  
Michael T. Schaper
Keyword(s):  
Small Business ◽  
Small Firms ◽  
Formal Education ◽  
Extensive Literature ◽  
Business Sector ◽  
Role Of Government ◽  
Content Type ◽  
Support Tools ◽  
History Of ◽  
Training And Research

Purpose – The purpose of this paper is to provide an overview of the development of the SME sector in Australia, concentrating on a number of key areas: small business definitions and numbers; the role of government; the emergence of key industry groups; and the evolution of education, training and research services. Design/methodology/approach – The study is a result of extensive literature reviews, desk research and the recollections of various participants in the field. Findings – There have been major changes to the Australian small business sector over the last 40 years. In 1983-1984 there were an estimated 550,000 small firms, and by 2010 this had grown to almost two million. Government involvement in, and support for, SMEs was virtually non-existent before 1970. Following the delivery of the Wiltshire report (1971), however, both state and federal governments responded by developing specialist advisory services, funding programmes and other support tools. Virtually non-existent before the 1970s, several peak industry associations were formed between 1977 and the 1990s. At the same time, formal education and teaching in the area expanded in the 1970s and 1980s and is now widespread. Practical implications – Development of the small business sector in Australia has often paralleled similar trends in other OECD nations. State and territory governments have often (but not always) been the principal drivers of policy change. Originality/value – There has been no little, if any, prior documentation of the evolution of the small business sector in Australia in the last 40 years.

Haunted by the past: transformations and daily challenges of China's prosthetics

2020 ◽  
Vol 10 (1) ◽  
pp. 115-124
Author(s):  
Chunchun Wang
Keyword(s):  
Design Methodology ◽  
Cross Cultural ◽  
Future Research ◽  
Institutional Pressures ◽  
Rehabilitation Center ◽  
Content Type ◽  
The Past ◽  
Daily Experiences ◽  
History Of ◽  
Depth Interviews

PurposeThe purpose of this paper is to examine the transformations of prosthetic practices in China, as well as the daily experiences and dilemmas arising from the everchanging practices since 1949. On the basis of materials, this paper explores an everyday perspective to review the history of technology.Design/methodology/approachEthnography was collected with the application of participant observations, informal interviews and in-depth interviews during a 13-months study at a rehabilitation center in Chengdu, China. The literature on prosthetic manufacturing was also reviewed for this paper.FindingsChina's prosthetic technology seems to evolve from traditional to modern. However, this progressive narrative – innovation-based timeline (Edgerton, 2006, xi) – has been challenged by daily practices. Due to institutional pressures, prosthetists are in a dilemma of selectively using their knowledge to create one kind of device for all prosthesis users with a certain kind of disability, thereby regulating the physical and social experiences of prosthesis users. Besides, prosthesis users are accustomed to prostheses made with old techniques, and must correct themselves from old experiences to the daily practices recognized by the selected techniques.Originality/valueThis paper provides a cross-cultural case to reexamine Edgerton's criticism of the progressive and orderly innovation-centric technological narrative. More importantly, it reviews the history and practices of China's prosthetics from daily experiences rather than Edgerton's concentration on technology; therefore, it provides an everyday perspective for future research on technological transformations.

The case of motivprints: balancing entrepreneurial instinct with managerial approach

2020 ◽  
Vol 10 (2) ◽  
pp. 1-16
Author(s):  
Kedar Bhatt ◽  
Abhinava S. Singh
Keyword(s):  
Growth Stage ◽  
New Ventures ◽  
Development Program ◽  
Master's Level ◽  
Executive Development ◽  
Content Type ◽  
Academic Level ◽  
Permanent Staff ◽  
Entrepreneurial Activities ◽  
Made In

Learning outcomes After studying this case, the students/participants would be able to: discuss important personality traits of an entrepreneur; understand specific challenges faced by a venture as it moves toward higher growth stage; discuss the importance of strategic planning and managerial style as the ventures move from establishment stage to growth stage. Case overview/synopsis The case is about MotivPrints, a two years old venture, offering custom designing and commercial printing to businesses in Gujarat, India. MotivPrints was established by Himanshu Dhadnekar in 2016 and had 85 SME clients and 35 vendors by 2019. Himanshu, a young entrepreneur had been involved in entrepreneurial activities since his school days and was also involved in a couple of business ventures during his MBA. However, he had been flip-flopping as an employee and entrepreneur, as then. At MotivPrints, he handled key responsibilities of developing client networks, generating business, marketing and managing relationship with vendors. With limited support of a team of freelancer associates, no permanent staff for assistance and lack of funds made it imperative for Himanshu to plan for scaling up his venture for survival and growth. Could he envision MotivPrints as a larger entity? If yes, what changes, mandated by growth, were needed to be made in both – the entrepreneur and the organization? Complexity academic level The case can be discussed in the class of entrepreneurship at the master’s level. It can also be used in the entrepreneurship specialization course in the second year of post-graduation. The case can be also be used for young entrepreneurs in an executive development program focusing on new ventures. Supplementary materials Teaching notes are available for educators only. Subject code CSS: 3 Entrepreneurship.

Political radicalization and fragmentation of the democratic blocs and the legislative council elections in the Hong Kong Special Administrative Region

2017 ◽  
Vol 6 (4) ◽  
pp. 372-384
Author(s):  
Chung Fun Steven Hung
Keyword(s):  
Hong Kong ◽  
Political Parties ◽  
Special Administrative Region ◽  
Content Type ◽  
Legislative Council ◽  
Administrative Region ◽  
Two Systems ◽  
History Of ◽  
One Country Two Systems ◽  
Historical Comparative

Purpose After direct elections were instituted in Hong Kong and the sovereignty was transferred from Britain to China, politicization inevitably followed democratization. The purpose of this paper is to evaluate the pro-democratic political parties’ politics in Hong Kong in recent history. Design/methodology/approach The research was conducted through a historical comparative analysis, within the context of Hong Kong after the sovereignty handover and the interim period of crucial democratization. Findings With the implementation of “One country, Two systems,” political democratization was hindered in Hong Kong’s transformation. The democratic forces have no alternative but to seek more radicalized politics, which has caused a decisive and ineluctable fragmentation of the local political parties. Originality/value This paper explores and evaluates the political history of the Hong Kong Special Administrative Region under “One country, Two systems” and the ways in which the limited democratization hinders the progress of Hong Kong’s transformation.

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