Fuzzy reliability analysis of dual-fuel steam turbine propulsion system in LNG carriers considering data uncertainty

Komal,; Chang, Daejun; Lee, Seong-yeob

doi:10.1016/j.jngse.2015.01.030

Cited by 34 publications

(14 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The electric power demand onboard is supplied by two steam turbines generators and one medium-speed diesel generator. The estimated overall thermal efficiency of 30 MW conventional steam power plant powered by Mitsubishi is 35% [21]. In order to improve the thermal efficiency of the steam power plant, reheating of the high pressure steam turbine is incorporated [14,22].…”

Section: Steam Turbine Propulsion (St)mentioning

confidence: 99%

Environmental and Cost-Effectiveness Comparison of Dual Fuel Propulsion Options for Emissions Reduction Onboard LNG Carriers

Ammar¹

2019

brod

View full text Add to dashboard Cite

The selection of the suitable propulsion system for LNG carrier highly affects the ship capital and life cycle costs. The current paper compares between the available propulsion systems for LNG carriers from environmental and economic points of view operated with heavy fuel oil (HFO) and marine gas oil (MGO). In addition, the cost-effectiveness for emission reduction due to using dual fuel propulsion options using natural gas fuel (NG) is calculated. As a case study, large conventional LNG carrier class has been investigated. The results show that steam turbine (ST), Ultra-ST, dual fuel diesel engine (DFDE), and combined gas and steam (COGAS) propulsion options can comply with NOx and SOx emissions regulations set by IMO using dual fuel mode with NG percentages of 87.5%, 82%, 98.5% and 94%, respectively. DFDE operated with pilot HFO and NG is the most economic propulsion option.

show abstract

Section: Steam Turbine Propulsion (St)mentioning

confidence: 99%

Environmental and Cost-Effectiveness Comparison of Dual Fuel Propulsion Options for Emissions Reduction Onboard LNG Carriers

Ammar¹

2019

brod

View full text Add to dashboard Cite

show abstract

“…Shape preserving nature and reducing fuzzy accumulation are two important characteristics of T ω which always inspire researchers to use it for solving their fuzzy reliability problems under vague environment. Let true A ˜ = ( a 1 , a 2 , a 3 ) and true B ˜ = ( b 1 , b 2 , b 3 ) be two TFNs, then T ω -based simplified fuzzy arithmetic operations are as follows (Lin et al , 2011; Komal et al , 2015): addition of T ω : subtraction of T ω : multiplication of T ω : division of T ω : …”

Section: Basic Concepts On Fuzzy Set Theorymentioning

confidence: 99%

“…To overcome the above noticed problems of accumulating phenomenon of fuzziness and slow execution process for evaluating complicated washing system fuzzy reliability, the present study utilizes the T ω -based fuzzy lambda-tau (TBFLT) technique introduced by Komal et al (2015). This technique applies the LT method, FTA, TFN and T ω -based simplified fuzzy arithmetic operations defined for TFN (Lin et al , 2011; Mon and Cheng, 1994).…”

Section: Introductionmentioning

confidence: 99%

Fuzzy reliability analysis of the washing system in a paper plant using the TBFLT technique

Komal

2017

IJQRM

View full text Add to dashboard Cite

Purpose The purpose of this paper is to analyze the reliability of the washing system in a paper plant in a more promising way under vague environment by reducing the accumulating phenomenon of fuzziness and accelerating the computation process using the Tω (weakest t-norm) based fuzzy lambda-tau (TBFLT) technique. Design/methodology/approach This paper presents a unified approach for analyzing the fuzzy reliability of the washing system under vague environment. This approach applies the TBFLT technique which uses triangular fuzzy numbers for incorporating data uncertainty, fault tree and lambda-tau method for finding system failure rate and repair time mathematical expressions while simplified Tω-based arithmetic operations are applied for computing various reliability parameters of the system. The effectiveness of the TBFLT technique has been demonstrated by analyzing fuzzy reliability of the system using five different techniques including TBFLT. Moreover, this paper applies extended Tanaka’s (1983) approach to rank the critical components of the system. Findings The TBFLT technique has the advantage of low computation complexity in comparison to other techniques and effectively reduces the accumulating phenomenon of fuzziness. This main finding verifies the conclusion made by Chen (1994). Originality/value The author has suggested a simple and more applicable technique for analyzing the fuzzy reliability of any complex process industrial system under vague environment. The effectiveness of the technique has been demonstrated by computing various reliability parameters of the washing system of a paper plant.

show abstract

“…Allal et al 10 investigated the reliability of the sea water central cooling system whilst Allal et al 11 focused on enhancing the main engine lubricating oil system to ensure the safe operation of an autonomous ship using the FTA and FMEA methods. Komal et al 12 implemented a fuzzy reliability analysis for dual-fuel steam turbine mechanical propulsion conventional system of Liquefied Natural Gas carriers, using FTA for system modelling. Chang et al 13 investigated the reliability of different propulsion systems using FTA and FMEA.…”

Section: Introductionmentioning

confidence: 99%

A functional model-based approach for ship systems safety and reliability analysis: Application to a cruise ship lubricating oil system

Dionysiou

Bolbot

Theotokatos

2021

Proceedings of the Institution of Mechanical Engineers, Part M:

View full text Add to dashboard Cite

The lubricating oil systems are essential for ensuring the safe and reliable operation of the cruise ships power plants as demonstrated by recent incidents. The aim of this study is to investigate the safety enhancement of a cruise ship lubricating oil system by employing safety, reliability, availability and diagnosability analyses, which are based on the system functional modelling implemented in the MADe™ software. The safety analysis is implemented by combining a Failure Modes, Effects and Criticality Analysis and the systems functional Fault Tree Analysis. Subsequently, Reliability Block Diagrams are employed to estimate the system reliability and availability metrics. The MADe™ toolbox for determining sensors locations is employed for a more advanced diagnostic system development. A number of design modifications are proposed and the alternative configurations reliability metrics are estimated. The derived results demonstrate that the suction strainer and the lubricating oil pump are the most critical system components. Seven additional sensors are proposed to enhance the original system design. Compared with the original system design, the investigated alternative designs exhibit significantly lower probabilities of failure and higher values of availability.

show abstract

Fuzzy reliability analysis of dual-fuel steam turbine propulsion system in LNG carriers considering data uncertainty

Cited by 34 publications

References 41 publications

Environmental and Cost-Effectiveness Comparison of Dual Fuel Propulsion Options for Emissions Reduction Onboard LNG Carriers

Environmental and Cost-Effectiveness Comparison of Dual Fuel Propulsion Options for Emissions Reduction Onboard LNG Carriers

Fuzzy reliability analysis of the washing system in a paper plant using the TBFLT technique

A functional model-based approach for ship systems safety and reliability analysis: Application to a cruise ship lubricating oil system

Contact Info

Product

Resources

About