المؤلفون: Changhun Han, Rabiul Islam, Apsara Abeysiriwardhane, Shuhong Chai

المصدر: Journal of International Maritime Safety, Environmental Affairs, and Shipping, Vol 8, Iss 3 (2024)

مصطلحات موضوعية: Situation awareness global assessment technique, 3-dimensional situation awareness rating technique, fault detection, change blindness, schema instantiation, engine room monitoring, Environmental pollution, TD172-193.5, Naval architecture. Shipbuilding. Marine engineering, VM1-989

الوصف: Remote operation offers promising advantages as a viable transitional phase toward autonomous ships, but at the same time, it introduces new challenges in maintaining situation awareness. However, situation awareness is misunderstood as an essential construct for only navigational tasks, albeit situation awareness issues are recurrently reported during system monitoring, e.g. power plants. Hence, this within-subjects study developed the two situation awareness support systems for engine room monitoring based on information requirements and schema instantiation. Sixteen marine engineers participated in the four simulation experiments, and their objective and subjective situation awareness, fault detection rate, response speed and change blindness were evaluated. The findings describe that presenting a few critical perception elements for comprehension is promising to mitigate interface complexity and enable efficient pattern matching. However, caution is necessary for selecting the means of access to elements of low importance, as it can induce attentional tunnelling and additional cognitive load, which can devastate the situation awareness and fault-detecting performance when compounded by high cognitive load from primary monitoring tasks. This study recommends entailing the current level of situation awareness, cognitive load and stress into the support system design to determine the extent and timing of assistance for varying operational demands.

وصف الملف: electronic resource

العلاقة: https://doaj.org/toc/2572-5084Test

الوصول الحر: https://doaj.org/article/68d8612273694214966d59acb9e8274eTest

المؤلفون: Intan Baroroh, Buana Ma’ruf, Minto Basuki, Didik Hardianto, Tri Agung Kristiyono

المصدر: International Journal of Technology, Vol 15, Iss 1, Pp 75-86 (2024)

مصطلحات موضوعية: bayesian network, installation engine room module, risk analysis, Technology, Technology (General), T1-995

الوصف: Implementation of system installation risk on engine room module aims to anticipate ship production delays. However, in its implementation, there is the problem of ship delivery delays in various shipbuilding companies. This research will analyze the risk analysis of the installation of the engine room module system by identifying risk factors and parameters that affect performance as a hazard identification that has the potential to cause delivery delays. The object of the research is the Indonesian Navy's Auxiliary Hospital Ship, which has 6 zones with a pilot project developed in zone 2. This includes an engine room that contains important constructions in the form of a main motor foundation, auxiliary motor, and other machinery, where the system was integrated. Moreover, there are some works consisting of construction, outfitting, and commissioning which are very complicated and require high accuracy. The aim of the implementation of risk analysis of the installation system in the engine room’s module is to assess potential risks, the effect of risk on project delays, and project cost overruns. The research method uses a Bayesian network because it is able to assess the most potential risks and predict the possibility of delays at network nodes. The primary risk is associated with electrical activities, specifically electrical outfitting on wiring, clamping, and compound sub-components with a probability of (0.0002560) in the Machinery Outfitting and Electrical Department. This risk stems from inappropriate steps during drawing revisions, which have the potential to cause delays in equipment installation, cable material procurement, and the generation of cable cutting data. Therefore, early coordination with production planning control, design, and the supply chain is crucial.

وصف الملف: electronic resource

العلاقة: https://ijtech.eng.ui.ac.id/article/view/5136Test; https://doaj.org/toc/2086-9614Test; https://doaj.org/toc/2087-2100Test

الوصول الحر: https://doaj.org/article/3abc198c83d24b8ca1c023cc1795b4ecTest

المؤلفون: Pham Thanh-Nhut, Le Quoc Tien, Do Quang Thang

المصدر: Curved and Layered Structures, Vol 11, Iss 1, Pp p. 1-200 (2024)

مصطلحات موضوعية: heat transfer, insulation, engine room wall, fire protection, multi-layer structure, Mechanics of engineering. Applied mechanics, TA349-359

الوصف: The thermal insulation layer of the ship’s engine room bulkhead is typically constructed from multiple layers of mineral wool. This layer is designed to keep the temperature on the surface of the bulkhead below 140°C in case of a fire. However, measuring the inner and external temperatures of each wall panel bulkhead type during a fire can be difficult. To address this issue, this study was conducted to evaluate the multilayer heat transfer capability of the bulkhead insulation in the event of an engine room fire. The study used heat transfer theory, experimental models, and numerical analysis to assess nine bulkhead insulation specimens. These specimens were fabricated from three original specimens and included a 10–30 mm air layer (W-75, W-50, and W-25). The results showed that all improved specimens had better thermal insulation than the originals. Among them, the improved specimens derived from the W-25 specimen exhibited the most significant temperature reduction compared to those derived from the W-75 and W-50 specimens. The results demonstrated a slight difference between the three methodologies, indicating a high level of reliability in the research findings.

وصف الملف: electronic resource

العلاقة: https://doaj.org/toc/2353-7396Test

الوصول الحر: https://doaj.org/article/16269464dfcc4127a1e0d0a917b8eb96Test

المؤلفون: Kan Wang, Rui Qiu, Yang Ming, Hang Xu

المصدر: Journal of Marine Science and Engineering, Vol 12, Iss 5, p 798 (2024)

مصطلحات موضوعية: ship engine room, marine diesel, ignition characteristics, surface temperature, predictive model, Naval architecture. Shipbuilding. Marine engineering, VM1-989, Oceanography, GC1-1581

الوصف: To ensure the safe protection of marine engine systems, it is necessary to explore the hot surface ignition (HSI) characteristics of marine diesel in ship environments. However, an accurate model describing these complex characteristics is still not available. In this work, a new experimental method is proposed in order to enhance prediction performance by integrating testing data of the characteristics of HSI of marine diesel. The sensitivity of HSI is determined by various factors such as surface parameters, flow state, and the ship’s environment. According to variations in the HSI status of marine diesel in an engine room, the HSI probability is distributed in three phases. It is essential to determine whether the presence of marine diesel or surrounding items can intensify the risk of an initial fire beginning in the engine room. A vapor plume model was developed to describe the relationship between HSI height and initial specific buoyancy flux in vertical space. Further, field distribution revealed significant variation in the increase in temperature between 200 and 300 mm of vertical height, indicating a region of initial HSI. In addition, increasing surface temperature did not result in a significant change in ignition delay time. After reaching a temperature of 773 K, the ignition delay time remained around 0.48 s, regardless of how much the hot surface temperature increased. This study reveals the HSI evolution of marine diesel in a ship engine room and develops data-based predictive models for evaluating the safety of HSI parameters during initial accident assessments. The results show that the goodness of fit of the predictive models reached above 0.964. On the basis of the predicted results, the HSI characteristics of marine diesel in engine rooms could be gleaned by actively determining the parameters of risk.

وصف الملف: electronic resource

العلاقة: https://www.mdpi.com/2077-1312/12/5/798Test; https://doaj.org/toc/2077-1312Test

الوصول الحر: https://doaj.org/article/613b938721944a33b99ed40a2d651a99Test

المؤلفون: Qiaoyu ZHANG, Hanjiang SONG, Liangcai LI, Zhenguo SONG, Zhengxiang LI

المصدر: Zhongguo Jianchuan Yanjiu, Vol 17, Iss Supp1, Pp 73-80 (2022)

مصطلحات موضوعية: marine power system, intelligent engine room, fault diagnosis, intelligent operation and maintenance, Naval architecture. Shipbuilding. Marine engineering, VM1-989

الوصف: ObjectivesIn order to improve the reliability and reduce the maintenance costs of marine power equipment, this paper study intelligent operation and maintenance techniques and implementation methods for marine power systems.MethodsFirst, a marine power system intelligent operation and maintenance framework based on digital twin technology is established according to module functions and system structure. Intelligent control technology based on the aggregative stability indicator is then proposed, including the optimal operating condition database, intelligent control parameter search method and variable operation process optimization method. Finally, according to the knowledge-based, model-based and big data-driven fault diagnosis methods, the integrated fault diagnosis of complex systems is realized, and a digital twin-based intelligent operation and maintenance system for power systems is constructed. ResultThe application case of an intelligent power system operation and maintenance platform verifies the feasibility of realizing intelligent control and fault diagnosis functions. ConclusionThe results of this study can provide valuable references for the research and design of intelligent engine rooms.

وصف الملف: electronic resource

العلاقة: https://doaj.org/toc/1673-3185Test

الوصول الحر: https://doaj.org/article/4c8fdbd156504918aeb3f84e886398f6Test

المؤلفون: Chaoyou GUO, Zhe XU, Qian YAO

المصدر: Zhongguo Jianchuan Yanjiu, Vol 17, Iss 6, Pp 118-125 (2022)

مصطلحات موضوعية: intelligent engine room, remaining useful life prediction, bearing, ensemble learning, stacking, Naval architecture. Shipbuilding. Marine engineering, VM1-989

الوصف: ObjectivesWith reference to the definitions and requirements of intelligent engine rooms in the China Classification Society Rules for Intelligent Ships, this paper studies methods for predicting the remaining useful life (RUL) of bearings in order to explore prognostic and health management technologies.MethodsAddressing the poor prediction accuracy of conventional data-driven methods, this study uses the Stacking fusion strategy in integrated learning to construct an R-A-X (Ridge-ANN-XGBoost, with XGBoost and ANN as the base learner, and ridge regression as the meta learner) fusion model. It then designs a prediction performance comparison experiment using the life cycle data in the IEEE PHM 2012 Prognostic Challenge under the same working conditions, with MAE and R2 used as performance evaluation indicators to compare the R-A-X fusion model with the single algorithm and average.ResultsThe results show that the prediction performance of the R-A-X fusion model are better than those of the other methods involved in this article, with an improvement effect reaching up to 20%.ConclusionsThe proposed method can improve the accuracy of bearing RUL prediction and has certain reference value for the realization of the equipment health management of intelligent engine rooms.

وصف الملف: electronic resource

العلاقة: https://doaj.org/toc/1673-3185Test

الوصول الحر: https://doaj.org/article/d3b3204976f84e6ab9f655f995436148Test

المؤلفون: Liang XU, Lifeng GUO, Congwei ZHONG, Qinbiao QIAN

المصدر: Zhongguo Jianchuan Yanjiu, Vol 17, Iss 6, Pp 15-21 (2022)

مصطلحات موضوعية: unmanned surface vessel (usv), intelligent engine room, conceptual design, technology application, Naval architecture. Shipbuilding. Marine engineering, VM1-989

الوصف: Autonomous unmanned surface vessels (USVs) are drawing increasing attention. The intelligent technology of the engine room is the basis of USVs that feature long voyage course and fully autonomous operation, and it ensures that the goals of the USV can be achieved. First, this paper reviews the development status at home and abroad. The scope of the intelligent objectives of the engine room is then proposed, and five ability target images of engine room intelligent technology are identified. Next, the Application-Control-Onsite technology application solution, components and path are presented. Finally, several development key points of engine room intelligent technology are discussed. This work can provide valuable references for the general technological R&D of USVs.

وصف الملف: electronic resource

العلاقة: https://doaj.org/toc/1673-3185Test

الوصول الحر: https://doaj.org/article/a08a05fb74e14f9f8ab923c04e15a189Test

المؤلفون: Mengmeng XU, Chengwei ZHANG, Shunfeng MEI, Zijie LIU, Tianyu LUAN

المصدر: Zhongguo Jianchuan Yanjiu, Vol 17, Iss 6, Pp 79-87 (2022)

مصطلحات موضوعية: intelligent engine room, operation and maintenance system, ship-shore integration, data brain, Naval architecture. Shipbuilding. Marine engineering, VM1-989

الوصف: ObjectiveIn order to improve the intelligent level of ship engine room operation and maintenance (O&M), a technical route is developed according to the characteristics of the engine room equipment, such as variety, quantity and complex coupling relationship, and propose a ship-shore integrated intelligent O&M system for ship engine room.MethodsBy analyzing the technical development trend of the intelligent O&M system of an engine room at home and abroad, an intelligent O&M system that conforms to the characteristics of an engine room is designed by integrating the technical advantages of health management, big data mining, digital twinning, lightweight data transmission and so on. ResultsA data-brain enabled functional framework, platform design, operation system, operation process and key technology application of an engine room intelligent O&M system are designed.ConclusionThe results of this study can provide references for the design and application of the intelligent O&M system of ship engine room.

وصف الملف: electronic resource

العلاقة: https://doaj.org/toc/1673-3185Test

الوصول الحر: https://doaj.org/article/a91ac9bde0574fbabbb6defa4cb24084Test

المؤلفون: Liang Wang, Yinshu Guo, Zhaowang Xia, Xingsheng Lao, Shichuan Su, Zhilin Yuan, Zhongzheng Wu

المصدر: Case Studies in Thermal Engineering, Vol 41, Iss , Pp 102595- (2023)

مصطلحات موضوعية: Ship engine room, Pool fires, Two-way/indirect ventilation, Mass burning rate, Flame geometry, Ventilation speed, Engineering (General). Civil engineering (General), TA1-2040

الوصف: The influence of wind on the combustion of pool fires has been demonstrated experimentally. However, the complex pipeline ventilation in the engine room is often ignored by existing research. For the typical ventilation structure of the engine room in this paper, a type of two-way/indirect ventilation structure in a confined space with dimensions of 1.5 × 1.5 × 1 m3 is built. N-heptane is used as the fuel, and a circular pool with a diameter of 10 cm is used in the experiments. The variation of mass burning rate and flame geometry under ventilation speeds of 0–4 m/s are studied. The results show that two-way/indirect ventilation greatly changes the combustion characteristics of the pool fires. The mass burning rate fluctuates and increases with increasing ventilation speed. The tilt angle and length of the flame changes nonlinearly with different ventilation speeds, and the ‘swaying’ phenomenon of flame tilt is presented. In addition, the existing correlations of the flame geometry of pool fires under ventilation are further improved. The models predicting flame tilt angle and flame length of pool fires with different ventilation speeds under two-way ventilation structure are established.

وصف الملف: electronic resource

العلاقة: http://www.sciencedirect.com/science/article/pii/S2214157X22008322Test; https://doaj.org/toc/2214-157XTest

الوصول الحر: https://doaj.org/article/ed1bea989fcd4041860d342d72c8d946Test

المؤلفون: Gazi Koçak, Veysel Gokcek, Yakup Genç

مصطلحات موضوعية: Process Fault Detection and Diagnosis in Industries, Control and Systems Engineering, Engineering, Physical Sciences, Materials Engineering in Industrial Applications, Mechanics of Materials, Environmental Impact of Maritime Transportation Emissions, Environmental Engineering, FOS Environmental engineering, Environmental Science, Ship Propulsion, Diesel engine, Fault geology, Propulsion, Automotive engineering, Fault detection and isolation, Automation, Set abstract data type, Marine propulsion, Condition monitoring, Engine room, Computer science, Control engineering, Artificial intelligence, Mechanical engineering, FOS Mechanical engineering, Actuator, Electrical engineering, Aerospace engineering, Seismology

الوصف: A marine engine room is a complex system in which many different subsystems are interacting with each other. At the center of this system is the main diesel engine which produces the propulsion force. Many other components such as compressed air, cooling, heating, lubricating oil, fuel, and pumping systems act as auxiliary machines to the main engine. Automation of many functions in the engine room is starting to play an important role in new generation ships to provide better control using sensors monitoring the engine and its environment. Sensors exist in the current generation ships, but engineers evaluate the sensor data for the presence of any problems. Maintenance actions are taken based on these manual analyses or regular maintenance is carried out at times determined by manufacturers, whether such actions are needed or not. With machine learning, it is possible to develop an algorithm using past evaluations made by engineers. Recent studies show that highly accurate results can be obtained using ... : غرفة المحرك البحرية هي نظام معقد تتفاعل فيه العديد من الأنظمة الفرعية المختلفة مع بعضها البعض. يوجد في وسط هذا النظام محرك الديزل الرئيسي الذي ينتج قوة الدفع. تعمل العديد من المكونات الأخرى مثل الهواء المضغوط والتبريد والتدفئة وزيت التشحيم والوقود وأنظمة الضخ كآلات مساعدة للمحرك الرئيسي. بدأت أتمتة العديد من الوظائف في غرفة المحرك تلعب دورًا مهمًا في سفن الجيل الجديد لتوفير تحكم أفضل باستخدام أجهزة الاستشعار التي تراقب المحرك وبيئته. توجد أجهزة استشعار في سفن الجيل الحالي، لكن المهندسين يقيمون بيانات المستشعر بحثًا عن أي مشاكل. يتم اتخاذ إجراءات الصيانة بناءً على هذه التحليلات اليدوية أو يتم إجراء الصيانة المنتظمة في الأوقات التي تحددها الشركات المصنعة، سواء كانت هذه الإجراءات مطلوبة أم لا. مع التعلم الآلي، من الممكن تطوير خوارزمية باستخدام التقييمات السابقة التي أجراها المهندسون. تظهر الدراسات الحديثة أنه يمكن الحصول على نتائج دقيقة للغاية باستخدام أساليب التعلم الآلي عندما تكون هناك بيانات كافية. في هذه الدراسة، نقوم بتطوير خوارزميات جديدة قائمة على التعلم وتقييمها بناءً على البيانات التي تم الحصول عليها ...

العلاقة: https://dx.doi.org/10.60692/0h862-3f223Test

الإتاحة: https://doi.org/10.60692/92yqq-wqe4510.60692/0h862-3f223Test