Global ETD Search

1	A study on the improvement of marine diesel engine transient performance by means of air injection Wei, Fang, January 2005 (has links) Thesis (Ph. D.)--University of Hong Kong, 2006. / Title proper from title frame. Also available in printed format. Diesel motor Marine diesel motors.
2	A study on the improvement of marine diesel engine transient performance by means of air injection Wei, Fang, 魏昉 January 2005 (has links) published_or_final_version / abstract / Mechanical Engineering / Doctoral / Doctor of Philosophy Diesel motor - Turbochargers. Marine diesel motors.
3	Characterization of in-use emissions from marine engines George, Sam, January 2004 (has links) Thesis (M.S.)--West Virginia University, 2004. / Title from document title page. Document formatted into pages; contains xiv, 132 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 108-112).
4	Corrosion and abrasion of rings and liners from marine diesel engines using residual fuel Dale, P. E. January 1982 (has links) The aim of this research was to investigate the interaction of abrasion and corrosion on rings and liners from marine diesel engines using high sulphur residual fuels. Pure corrosion effects were simulated in a sealed vessel containing emulsified lubricant and acid. Graphite was found to stimulate corrosion of ferrite but phosphide eutectic and iron carbide remained unattacked. A reciprocating test was used to combine the mechanisms of abrasion and corrosion which have been identified as producing normal wear in marine engines. The severity of the mechanisms were balanced to produce surfaces similar to those often encountered over the centre of an engine stroke. Two engine tests, specified to compare the type and extent of wear using high and low sulphur fuels, showed that an increase in corrosion resulting from increased fuel sulphur was not directly responsible for a measured increase in top ring wear rate. Corrosion was thought to dissolve the ferritic phases to release hard phases into the system which intensified abrasion of the surfaces. It was also possible that phosphide eutectic was left at a sufficiently high level above the surface by corrosion of the matrix to cause direct abrasion of the ring. Throughout the experimental work particular emphasis was placed on examination and interpretation of the interaction of corrosion and abrasion in lubricated acidified environments. 620.11223
5	Condition monitoring of diesel engines Moore, David John January 2013 (has links) Reliability of emergency Diesel generator systems, or indeed any Diesel engines in a wide range of fields is critical. Traditional maintenance procedures for these engines follow time based or statistical based methods. Due to the wide variety of uses of Diesel engines it is not possible for these forms of maintenance to be as effective as condition based monitoring. Condition based monitoring holds many advantages over traditional maintenance methods. It allows for the earlier detection and diagnosis of a fault and allows for planned maintenance work avoiding costly and unexpected downtime. It also reduces the overall maintenance costs as parts need only be replaced when they are worn or faulty, not based on a time schedule. The ability to unobtrusively monitor the engines also has many advantages in- cluding reduced sensor cost and negating the need to tamper permanently with the engine. Acoustic monitoring has been identified as the most prominent and effective way in which to achieve this goal. As such, extensive experimentation was carried out on both large and small Diesel engines over a wide range of speeds, loads and faults and the data was then analysed. The data was first investigated statistically and then processed using Independent Component Analysis after the statistical re- sults were found to be poor. A program was written for the automatic comparison of the collected data and the results presented in this thesis show that ICA and acoustic emissions have the ability to aid in engine fault detection and diagnosis. The results have shown to be reliable, consistent and able to distinguish when the engine is healthy or faulty. 621.43
6	Analyses and impacts of emissions from marine engines Agrawal, Harshit. January 2009 (has links) Thesis (Ph. D.)--University of California, Riverside, 2009. / Includes abstract. Includes bibliographical references. Issued in print and online. Available via ProQuest Digital Dissertations.
7	Staten Island ferry emissions reduction Nuszkowski, John. January 2005 (has links) Thesis (M.S.)--West Virginia University, 2005. / Title from document title page. Document formatted into pages; contains xi, 94 p. : ill. (some col.), col. map. Includes abstract. Includes bibliographical references (p. 74-79).
8	Impact of sulphuric acid on cylinder lubrication for large 2-stroke marine diesel engines: Contact angle, interfacial tension and chemical interaction Sautermeister, F.A., Priest, Martin, Lee, P.M., Fox, M.F. January 2013 (has links) other / no / The effect of sulphuric acid on the chemical and physical behaviour of the piston ring lubricant in a marine engine cylinder was investigated. To reveal the basic influence of H2SO4 on the lubricant film, the saturated hydrocarbon Squalane (C30H62) was chosen as a simple model oil. The interfacial tension between aqueous H2SO4 (0-98% w/w) and C30H62 was measured between -3 and 165 degrees C to understand droplet formation in the lubricant. Interfacial tension decreases with increasing acid concentration and is temperature dependent. / The wettability of engine parts with corrosive sulphuric acid was characterised by the contact angle. The contact angle of H2SO4 (0-98% w/w) on a grey cast iron cylinder liner material (Wartsila, RT84) and a piston ring chrome-ceramic coating (Federal Mogul Goetze, CKS, empty set960 mm) immersed in C30H62 was measured over a temperature range from 20 to 165 degrees C. In general, larger contact angles were measured under higher temperature conditions and on chrome surfaces. / In addition to the physical measurements, chemical reaction between H2SO4 and C30H62 was observed which influenced the interfacial tension, visual appearance, phase separation and formation of solid matter. The reaction time was found to be faster than the neutralisation times of commercially formulated lubricants. The reaction products were analysed using FTIR spectroscopy and EDX to find oxidation and sulphonation.
9	FTIR lubricant analysis: Concentration of dispersed sulphuric acid Sautermeister, F.A., Priest, Martin, Fox, M.F. January 2014 (has links) No / This paper aims to establish the acid concentration of finely dispersed droplets in hydrocarbon oils. Small quantities of aqueous sulphuric acid (H2SO4) were found to be trapped within hydrocarbon shells, making them inaccessible for concentration evaluation by titration. Fourier transform infrared spectroscopy (FTIR) used in the attenuated total reflection mode (ATR; FTIR-ATR) was applied to study the reaction products of squalane, C30H62, and an API Group I base oil with various concentrations of aqueous H2SO4. The absorbance comparison usually used for estimating acid concentrations was found to fail when small quantities of acid are trapped in the reaction product. It was found that the peak shift and changes in absorbance found for various pure aqueous acid concentrations were useful to establish the remaining concentration of the trapped H2SO4. This paper fulfils the identified need to study acid dissociation-dependent peak shifts of H2SO4 to find the acid concentration of finely dispersed droplets in hydrocarbon oils. Ftir ; Emulsion ; Lubricant degradation ; Marine diesel engine ; Sulphuric acid ; Acid dissociation ; Infrared-spectroscopy ; Water structure ; Solutes
10	Liquid Natural Gas : A study of the environmental impact of LNG in comparison to diesel / Flytande Naturgas : En studie om LNG:s klimatpåverkan i jämförelse med diesel Edfors, Jonas, Bremberg, Robin January 2021 (has links) Liquefied Natural Gases (LNG) has been an alternative fuel in the marine industry for several years, but lately, the amount of ships that have been powered by methane has increased a lot. Some of the reasons for this is because LNG does not contain any sulfur and releases less nitrogen oxides than traditional maritime fuels. In this essay, LNG will be compared to diesel from an environmental perspective with focus on CO2 emissions and its equivalents. International Maritime Organization (IMO) implemented Energy Efficiency Design Index (EEDI) requirements that adjusts how much CO2 is allowed in the exhaust gas per produced kilowatt-hour (kWh). However, these requirements will increase in intervals in the future, the next one is coming 2022 for specific ship types. The method that is used to compare the fuels is Mole-calculations for LNG as well as diesel, then calculate the amount of carbon dioxide (CO2) and its equivalents they release. The results show that under optimal conditions, LNG was the superior choice. However, the maritime industry might have a problem with the requirements that will be introduced to greenhouse gas (GHG) emissions in 2050. / Flytande Naturgas (LNG) har under flera år funnits som ett alternativt bränsle inom sjöfarten, men på senare tid så har skeppen som drivs av metan ökat markant. En anledning till detta är att LNG innehåller inget svavel samt släpper ut mindre NOX jämfört med traditionella bränslen. I denna uppsats så kommer LNG att jämföras mot diesel ur ett klimatperspektiv med fokus på koldioxidutsläpp och dess ekvivalenter. International Maritime Organisation (IMO) har infört Energy Efficiency Design Index (EEDI) krav som justerar hur mycket CO2 man får släppa ut per kilowattimme (kWh), dessa krav kommer dessutom att öka i flertalet intervaller i framtiden, varav nästa intervall redan sker i 2022 för speciella fartygstyper. Metoden som användes för att jämföra bränslena var att beräkna mol-innehållet för både LNG samt diesel, sen från den beräknade data se hur mycket koldioxid (CO2) inklusive ekvivalenter de släppte ut. Resultatet visade att under optimala förutsättningar så var LNG ett klart bättre alternativ än diesel. Däremot så kan sjöfarten ha ett problem inom framtiden från de krav som berör växthusgaser som kommer att ställas från och med 2050. Methane LNG Engine Marine Mole Methane Slip Ship CO2 CH4 Emission IMO Exhaust gas Environment Propulsion Heavy Fuel Oil Ultra Low Fuel Oil Diesel Marine Diesel Oil ECA SECA NECA IMO g/kWh EEDI LSFO Metan LNG Motor Mol Skepp Miljö Miljövänligt Tjockolja Diesel Marine Diesel Avgas CO2 CH4 ECA SECA NECA IMO g/kWh EEDI LSFO Energy Engineering Energiteknik

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