Дисертації з теми "Comfort on board ship"
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Moro, Lorenzo. "Structure borne noise due to marine diesel engines: experimental study and numerical simulation for the prediction of the dynamic behaviour of resilient mounts." Doctoral thesis, Università degli studi di Trieste, 2015. http://hdl.handle.net/10077/11114.
Повний текст джерелаGli alti livelli di comfort che sono richiesti oggigiorno a bordo di navi da crociera e mega-yachts, portano i progettisti a concentrare la loro attenzione sul problema del rumore strutturale. I motori diesel quattro tempi che sono installati a bordo nave come motori principali o diesel generatori, sono tra le principali sorgenti di rumore strutturale. Per questa ragione, al fine di ridurre l’energia vibrazionale generata da queste sorgenti e trasmessa, tramite le strutture nave, ai locali alloggio, i motori diesel sono sospesi mediante elementi resilienti. Tali elementi resilienti disaccoppiano la sorgente di rumore e vibrazioni (motore diesel) dal mezzo di propagazione (le strutture nave) e isolano dunque la sorgente dalle strutture riceventi. I livelli di rumore strutturale misurati alle fondazioni del motore diesel dipendono dai livelli di velocità misurati sulla sorgente (cioè ai piedi del motore diesel), dai livelli di impedenza meccanica degli elementi resilienti e dai livelli di mobilità meccanica delle fondazioni del motore diesel. Il single-point approach è un approccio semplificato per la previsione dei livelli di rumore strutturale che trascura l’interazione tra elementi resilienti. Secondo tale teoria, al fine di ridurre il rumore strutturale trasmesso attraverso gli elementi resilienti alle strutture nave, si deve ridurre l’impedenza meccanica degli elementi resilienti così come la mobilità meccanica delle fondazioni del motore diesel. In altre parole, si devono aumentare la rigidezza dinamica degli elementi resilienti così come l’impedenza meccanica delle fondazioni del motore diesel. Ad oggi, l’impedenza meccanica degli elementi resilienti può essere ricavata solo mediante prove sperimentali in laboratorio, mentre la mobilità meccanica del motore diesel è solitamente misurata quando la nave è in costruzione. Dunque non vi è la possibilità di predire, in fase progettuale, il rumore strutturale dovuto ai motori diesel. In questa tesi, viene presentata una procedura per la simulazione del rumore strutturale dovuto a motori diesel marini. La procedura si basa su test sperimentali e simulazioni numeriche. Nella prima parte della tesi sono richiamate le basi teoriche necessarie per l’esecuzione delle procedure numeriche e delle prove sperimentali. Sono dunque presentati i risultati delle analisi numeriche per simulare la mobilità delle fondazioni dei motori diesel marini. I risultati delle analisi FEM sono stati validati mediante confronto dei risultati delle analisi numeriche con i dati ottenuti da una campagna di misure eseguite a bordo nave. Successivamente sono presentati i risultati di una serie di prove eseguite per collaudare una nuova macchina sperimentale per misurare l’impedenza meccanica degli elementi resilienti. Lo scopo del collaudo era definire una procedura per l’utilizzo della macchina e per l’esecuzione di prove sperimentali in accordo alla ISO 10846, che è considerata normativa di riferimento per questo tipo di prove. Si è dunque proceduto con l’esecuzione di prove sperimentali eseguite su un elemento resiliente per motori diesel marini. Le prove sono state eseguite a differenti carichi statici. I risultati di queste prove sperimentali sono stati utilizzati per settare un modello numerico che simuli il comportamento non-lineare del componente in gomma del resiliente. I risultati ottenuti sia dalle prove sperimentali sia dalle simulazioni numeriche sono stati utilizzati per predire il rumore strutturale generato dai motori diesel, in accordo al single-point approach. I risultati ottenuti dall’applicazione del metodo sono stati confrontati con misure eseguite a bordo e sono stati discussi per evidenziare vantaggi e svantaggi dell’applicazione del metodo. Le procedure numeriche per la simulazione del comportamento dinamico del resiliente e della fondazione costituiscono un primo passo per l’ottimizzazione del sistema di isolazione del motore diesel marino.
The high level of comfort that is required today on board cruise vessels and mega-yachts, leads the designers to focus their attention on structure-borne noise issues. Four-stroke diesel engines that are installed on board as main diesel engines for the propulsion system and as gen-sets, are usually the main sources of structure-borne noise. For this reason, the diesel engines are usually resiliently mounted in order to reduce the vibration energy generated by these sources and transmitted through the ship structures to the accommodation areas. These mounts decouple the noise and vibration source (diesel engine) from the means of wave propagation (ship structures) and so, they isolate the source from the receiving structures. The structure-borne noise levels measured at the diesel engine foundation depend on the velocity levels measured at the source (diesel engine feet), on the mechanical impedance levels of the resilient mounts and on the mechanical mobility levels of the diesel engine foundation. The simplified theory of the single-point approach neglects the interaction among the resilient mounts. According to this theory, to decrease the structure-borne noise transmitted through the resilient mounts towards the ship structures, the mechanical impedance of the resilient mounts as well as the mechanical mobility of the diesel engine foundation are to be lowered. In other words the dynamic stiffness of the resilient mounts has to be decreased and the mechanical impedance of the diesel engine foundation has to be increased. To date, the mechanical impedance of real resilient mounts can only be obtained by laboratory tests and the mechanical mobility of the diesel engine foundation is usually measured when the ship is under construction, so it is not available for predictive analyses. In the thesis, a procedure for simulating the structure-borne noise generated by marine diesel engine is discussed. The procedure is based on both experimental tests and numerical simulations. In the first part of the thesis, some notes on the theoretical background are presented. Then, the results of FE analyses for simulating the mechanical mobility of a diesel engine foundation are shown. The FE models have been validated by the results of a measurement campaign carried out on board a ship. Then, the results of a series of tests performed to tune a new test rig, designed and built up at the University of Trieste for measuring the mechanical impedance of resilient mounts, are discussed. The campaign for tuning the test rig has been carried out in order to set an experimental procedure that allows achieving results in compliance with the ISO 10846 Standard, which is a sound reference for this kind of tests. As a case study, a large resilient mount for marine diesel engines has been tested to achieve its mechanical impedance curve at different static pre-loads. The outcomes of the experimental tests have been used for tuning the best numerical model of the resilient mount that properly takes into account the nonlinear behaviour of the rubber core. The data of the experimental tests carried out on board ships as well as in laboratory and the outcomes of numerical simulations have been used to predict the structure-borne noise according to the single-point approach. The outcomes achieved by the application of the method have been compared with on board measurements and pros and cons of the method are widely discussed. Moreover, the numerical procedures for the simulation of the dynamic behaviour of the resilient mount and the diesel engine foundation, pave the way for the optimization of the decoupling system of marine diesel engines.
XXVII Ciclo
1982
Sweeney, Kevin Michael. "The Ship Characteristics and Improvement Board: a critical review." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/26239.
Повний текст джерелаNikitin, Yevgeniy. "Structural analysis and modeling for command decisions during fire on board ship." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA366351.
Повний текст джерела"June 1999". Thesis advisor(s): William J. Haga, Kishore Sengupta. Includes bibliographical references (p. 91-92). Also available online.
Karlsson, Anna, and Joel Skoglund. "Återkoppling av sjöpraktik : Hur sjökaptensstudenter upplever återkoppling av sjöpraktik." Thesis, Linnéuniversitetet, Sjöfartshögskolan (SJÖ), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-34440.
Повний текст джерелаFulton, Pamela Jeanne Allpress. "The Minerva journal, a journal kept on board the Minerva transport from Ireland to New South Wales : by J.W. Price, surgeon of s[superscript]d ship." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1995. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/MQ35554.pdf.
Повний текст джерелаNevřela, Petr. "Design reprezentačního automobilu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-227966.
Повний текст джерелаKřivka, Martin. "Demonstrační úlohy s KNX/EIB." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230044.
Повний текст джерелаMcLeod, Ian Alexander. "Leaving the ship but staying on board : a multiple case study of the voluntary shift from leader to teacher within the same educational institution : a thesis submitted to AUT University in partial fulfilment of the degree of Master of Education (MEd), 2009 /." Click here to access this resource online, 2009. http://hdl.handle.net/10292/676.
Повний текст джерелаJevická, Barbora. "Autonomní RC model lodi." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-416641.
Повний текст джерелаWernolf, Katarina, and Niklas Stenhammar. "Kemisk arbetsmiljörisk under fartygsförlagd utbildning : Inställning till tvåkomponentsfäger." Thesis, Linnéuniversitetet, Sjöfartshögskolan (SJÖ), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-82443.
Повний текст джерелаThe maritime world makes use of paint reinforced with thermosetting polymers. These may be harmful without the correct protective equipment and there are regulations stating that anyone working with it must be educated in the handling and risks associated with said paint as well as regularly undergo a spirometric test. Today students from the two Swedish maritime universities undertake their onboard studies under different conditions, some with the correct education and some without. This study has through a series of qualitative interviews tried to expose the effects. The interviews have shown that students with the correct education have a much better knowledge of the risks associated with thermosetting polymers and the different ways it might be exposed to them. The uneducated students were aware of the dangers but lacked the knowledge to adequately protect themselves. However, the study showed that this did not determine whether the students use personal protection as much as such factors as age, experience and the rest of the crew's attitude towards the risks.
Liu, Chien-Chung, and 劉建忠. "The Hot Pursuit Execution on Board Customs Patrol Ship." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/92835681761226299787.
Повний текст джерела國立高雄海洋科技大學
航運技術研究所
104
Preventing smuggling is a major objective of customs patrol ships, according to the Customs Anti-smuggling Act of the Republic of China. Officers on patrol ships engage in hot pursuit of any ship at sea that is suspected of engaging in illicit activity, boarding and inspecting such ships in accordance with Article 17 of the Law of the Territorial Sea and the Contiguous Zone of the Republic of China to protect the rights of our country in the sea. The purpose of this paper is to investigate the risks encountered by patrol ships, when customs officers are executing their duty at sea. Six primary elements influence the safety of hot pursuit operations at sea: seamanship, ship shape and materials, ship equipment, training courses, ship management, and the marine environment. For this study, these 6 primary elements were divided into 16 secondary elements and 49 research elements. Thereafter, this paper used questionnaire data to compare the experience of many different customs experts and thus provided some general advice. The analytic hierarchy process (AHP) was used to investigate the demand factors of the hot pursuit missions of customs patrol ships. Integrated analysis of the opinions of the customs experts revealed that the steel hulls and seaworthiness of patrol ships as well as the sailing skill of those who operate these ships should be improved for customs administration safety. The research finds two problems encountered by the existing ships and customs officers are rapidly-aging of patrol ship crew and the insufficient funding on ship and equipment maintenance. This would increase the risk of the on-duty ship due to poor maintenance. In summary, this study introduced a model with 5 solutions through which the customs authority can employ to improve customs officers’ safety during their sea patrol duty: to build new patrol ships by fixed number of years, to strengthen the training courses for onboard customs officers, to establish integrated management of the ship affairs unit, to reject the old patrol ship, and to plan the special budget for the sea patrol duty unit. This model can be used as a reference for the customs authority in operating and managing fleet of its patrol ships, and potentially enhancing the operation safety of patrol ships when they are executing missions at sea. Thus, these ships can safeguard national sovereignty and deter smuggling at sea.
Kuo-Liang, Lee, and 李國良. "The liability of full contanier ship to carry dangerous cargo on board." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/05766037868268539976.
Повний текст джерела國立海洋大學
航運技術研究所
90
ABSTRACT The liability of management and control of dangerous cargo transportation belong to the marine carrier. The International Maritime Organization (IMO) considering the different regulations and laws between the nations and caused lots of confusions and safety problem in transportation process. Then to make an “International Maritime Dangerous Goods Code (IMDG CODE)” for the marine carriers and all relevant parties and government departments as an international standard to follow. But The dangerous cargo accidents still occurred frequently due to the nation’s not well put into execution and the carrier’s not well performance plus the high risk and pressure in marine transportation. The collision accident of “Ever Decent” lighten the people to more concerning the liability of The full container ship’s management and control when carried the dangerous cargo. Personal wishes this article study can get some influences as follow: 1.The marine carrier exactly to perform the liability of dangerous cargo in transportation. 2.Establish the dangerous cargo training and certification system for shore and vessel’s members. 3.Practising ISM CODE safety management system, the transpor- tation of dangerous cargo under a sound management. 4.The government authority can do the function to endeavor the safety transportation and management of dangerous cargo. 5. The full container ship to carry dangerous cargo which can connect to international cooperation, interchange, education and training to promote mariner’s knowledge and quality to implement the safety transportation of dangerous cargo.
Atkins, Carrie E. "More than a Hull: Religious Ritual and Sacred Space on Board the Ancient Ship." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7485.
Повний текст джерелаWang, Dee-Way, and 王迪慰. "The Residual Current Derived from Ship-board ADCP Measurements of East China Sea in June 1999." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/24565836741299631346.
Повний текст джерела國立臺灣大學
海洋研究所
93
In most shallow seas, the major components of ocean current are tides. To derive the residual low frequency current velocity, one usually deploys current meter moorings over 25 hours or more to remove the diurnal and semi-diurnal tidal components. Using ship-board ADCP (Acoustic Doppler Current Profiler) to derive the residual current, one may design ADCP measurements at different phases of tides at every location. The sum of these measurements cancels out the tidal component. But, most cruises are aimed at other goals, and ADCP measurements are only complementary data of the cruise. Here, we demonstrate a method for deriving the M2 and S2 tidal current and the mean current from a 14-day cruise in the East China Sea, June 1999. The basic assumption is that the tidal current varies smoothly in the region of survey. This assumption is valid as seen in many tidal models of East China Sea. The 1-min ADCP data were first averaged over 11 minutes to reduce data size, then averaged over 12.4 hours to derive the residual current that contains little M2 tidal component. Data over continental slope were deleted because of the influence of Kuroshio and the possibility of large gradient in tidal velocity. The residual current data were fitted with bi-linear spatial function to capture its main feature. The pattern of derived mean current matches those published earlier from mooring and drifter data. The semi-diurnal tidal current equals the total current minus the residual current which is 12.4-hour moving average of total current velocity. The co-phase and co-range line of the semi-diurnal tidal current are similar to those of model results of semi-diurnal tidal elevation and tidal current observation near cruise track. This provides a proxy proof of the reliability of this method.
Kumar, Vijay. "Installation and Operation of Air-Sea Flux Measuring System on Board Indian Research Ships." Thesis, 2017. http://etd.iisc.ernet.in/2005/3778.
Повний текст джерела