Marine Engines Performance and Emissions

Galdo, María Isabel Lamas

doi:10.3390/jmse9030280

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…Since the MARPOL convention of 1973/1978, the International Maritime Organization (IMO) has implemented emission standards on the major environmental pollutants originating from vessels, namely NOx and SOx [ 1 ]. Recently, countries have been reinforcing these regulations to reduce the oxide content of ship fuels under the supervision of the IMO [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of PVC-Type Insulation Foam Material for Cryogenic Applications

Kim

et al. 2023

Polymers

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With the International Maritime Organization (IMO) reinforcing environmental regulations on the shipbuilding industry, the demand for fuels, such as liquefied natural gas (LNG) and liquefied petroleum gas (LPG), has soared. Therefore, the demand for a Liquefied Gas Carrier for such LNG and LPG also increases. Recently, CCS carrier volume has been increasing, and damage to the lower CCS panel has occurred. To withstand liquefied gas loads, the CCSs should be fabricated using a material with improved mechanical strength and thermal performance compared with the conventional material. This study proposes a polyvinyl chloride (PVC)-type foam as an alternative to commercial polyurethane foam (PUF). The former material functions as both insulation and a support structure primarily for the LNG-carrier CCS. To investigate the effectiveness of the PVC-type foam for a low-temperature liquefied gas storage system, various cryogenic tests, namely tensile, compressive, impact, and thermal conductivity, are conducted. The results illustrate that the PVC-type foam proves stronger than PUF in mechanical performance (compressive, impact) across all temperatures. In the tensile test, there are reductions in strength with PVC-type foam but it meets CCS requirements. Therefore, it can serve as insulation and improve the overall CCS mechanical strength against increased loads under cryogenic temperatures. Additionally, PVC-type foam can serve as an alternative to other materials in various cryogenic applications.

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Section: Introductionmentioning

confidence: 99%

Evaluation of PVC-Type Insulation Foam Material for Cryogenic Applications

Kim

et al. 2023

Polymers

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“…The entire issue is very extensive and includes aspects such as safety and lifetime of machines [3][4][5][6][7][8][9] and protection of workers against noise and vibration [10,11]. In the field of piston combustion engines, as a source of vibration, emphasis is placed on improving their efficiency and reducing emissions [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Novel Design of Variable Stiffness Pneumatic Flexible Shaft Coupling: Determining the Mathematical-Physical Model and Potential Benefits

Kaššay,

Grega,

Urbanský

et al. 2023

Machines

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Presently, mechanical system vibroisolation is becoming increasingly important. One of the new approaches is semi-active vibroisolation using elements capable of changing a selected mechanical property. These include, among others, pneumatic flexible shaft couplings capable of changing torsional stiffness during operation. The main goal of the article is to examine the potential advantages of a newly patented pneumatic coupling over a current type with the same pneumatic element arrangement. For comparison, parameters determinable from static load characteristics were selected. These parameters are maximum twist angle and torque, average torsional stiffness, and the percentage of torque transmitted by the bellows rubber shell. In all cases, the new coupling had better properties. Since the prototype of the new coupling has not yet been produced, its parameters were determined from its mathematical-physical model. The article contains a full procedure to obtain the static load characteristic of a new coupling type, beginning with the determination of air bellows force/height and volume/height characteristics, then optimum sizes of coupling with regards to the operating range of elements, the dependency of element height on the coupling’s twist angle, and finally the computation of the static load characteristic considering isothermal gas compression. The presented procedure can be applied to any pneumatic bellows where the force/height characteristics of different pressures are given.

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“…The scientific community is investing significant effort in developing efficient and less pollutant marine engines. According to this, the Special Issue, "Marine Engines Performance and Engines", published as a book [1], was prepared to collect works relating to marine engine performance and emissions in general. A total of 12 works [2][3][4][5][6][7][8][9][10][11][12][13] were published in this first Special Issue.…”

mentioning

confidence: 99%