Journal of Advanced Marine Engineering and Technology最新文献_第2页

Effects of harmonic on battery lifetime based on variations of space vector modulation in inverter 基于逆变器空间矢量调制变化的谐波对电池寿命的影响

Journal of Advanced Marine Engineering and Technology Pub Date : 2023-10-31 DOI: 10.5916/jamet.2023.47.5.219

VU Van Hung, Kyoung-kuk Yoon, Sung-geun Lee

{"title":"Effects of harmonic on battery lifetime based on variations of space vector modulation in inverter","authors":"VU Van Hung, Kyoung-kuk Yoon, Sung-geun Lee","doi":"10.5916/jamet.2023.47.5.219","DOIUrl":"https://doi.org/10.5916/jamet.2023.47.5.219","url":null,"abstract":": Various regulations for the prevention of environmental pollution are being implemented worldwide. Environmental pollution is mostly attributed to harmful gases emitted during engine combustion in ships or automobiles, including thermal power generation. To solve this problem, electricity is produced and stored from new renewable energy sources, such as solar, wind, and wave power, and is used to propel ships and cars. Electric propulsion ships or electric vehicle systems consist of a battery, an inverter, and an electric motor. The DC power stored in the battery is composed of a sinusoidal AC voltage through an inverter and is applied to the electric motor. The most important aspect is to safely manage a battery, which is a core component of an electric propulsion system, to avoid explosion, overheating or the generation of an overcurrent. Therefore, it is important not only to always observe the ambient temperature, rated voltage, and current but also to remove factors that may harm the safety of the battery in advance. In particular, the sinusoidal AC voltage applied to the motor modulates the command voltage into the form of a switching pulse, which is then applied to the upper and lower legs (Leg) of the inverter. Therefore, the voltage and current of the inverter contain various harmonics that can adversely affect the propulsion system, including the batteries. In this study, the modulation types of the two switching pulses are selected, and motor-speed control is performed according to each type. Simultaneously, the relationship between the harmonics and lifetime is analyzed by measuring the current harmonics flowing through an electrical motor and the internal resistance, which is a parameter that can predict the lifetime of the battery.","PeriodicalId":217894,"journal":{"name":"Journal of Advanced Marine Engineering and Technology","volume":"114 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139308618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of hydrodynamic analysis of eco-friendly buoys with biodegradable plastic materials 使用生物可降解塑料材料的环保浮标的流体力学分析研究

Journal of Advanced Marine Engineering and Technology Pub Date : 2023-10-31 DOI: 10.5916/jamet.2023.47.5.231

J. Jo

引用次数: 0

Effect of metal ratios on oxygen evolution reaction activity in binary hydroxide electrocatalysts 金属比例对二元氢氧化物电催化剂中氧进化反应活性的影响

Journal of Advanced Marine Engineering and Technology Pub Date : 2023-10-31 DOI: 10.5916/jamet.2023.47.5.226

Seo Hyun Park, Yoo-Sei Park

引用次数: 0

Preliminary study on the development of sailing modes for ships 关于船舶航行模式发展的初步研究

Journal of Advanced Marine Engineering and Technology Pub Date : 2023-10-31 DOI: 10.5916/jamet.2023.47.5.275

Changjae Moon, Giltae Roh, Kyunghwa Kim, Kido Park

{"title":"Preliminary study on the development of sailing modes for ships","authors":"Changjae Moon, Giltae Roh, Kyunghwa Kim, Kido Park","doi":"10.5916/jamet.2023.47.5.275","DOIUrl":"https://doi.org/10.5916/jamet.2023.47.5.275","url":null,"abstract":": The shipbuilding and shipping industries have recently adopted regulations, such as the energy efficiency design index, existing energy efficiency index, and carbon intensity indicator, from international maritime organizations. However, these regulations do not reflect factors such as the country-specific sailing habits of captains, sailing patterns by route, port environments, and speed regulations in different waters. In this study, we analyze the general factors and profiles that affect the sailing modes of ships and driving modes of automobiles, identify the problems that occur when applying the concepts of automobiles to ships, and investigate their solutions. Based on this, a sailing mode generation algorithm was developed, and the sailing modes of the training ship were constructed from the sailing profile of one voyage. The results can serve as basic data for developing representative sailing mode methodologies generated based on the probability that derives various sailing profiles of different types of ships into one representative sailing mode. In addition, the representative sailing modes derived for specific waters and routes can be used to design optimization systems for new ships and measure the standardized fuel efficiency of ships with various sailing profiles.","PeriodicalId":217894,"journal":{"name":"Journal of Advanced Marine Engineering and Technology","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139306924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on behavior and emission of methane/hydrogen diffusion flame with applied DC electric field 外加直流电场下甲烷/氢气扩散火焰的行为和排放研究

Journal of Advanced Marine Engineering and Technology Pub Date : 2023-10-31 DOI: 10.5916/jamet.2023.47.5.211

Byeong-Hun Seok, Jun-Seok Kim, S. Yoon, Jungho Hwang, Dae Geun Park

{"title":"Study on behavior and emission of methane/hydrogen diffusion flame with applied DC electric field","authors":"Byeong-Hun Seok, Jun-Seok Kim, S. Yoon, Jungho Hwang, Dae Geun Park","doi":"10.5916/jamet.2023.47.5.211","DOIUrl":"https://doi.org/10.5916/jamet.2023.47.5.211","url":null,"abstract":": This experimental study investigates the effect of DC electric fields on flame behavior and emissions in non-premixed hydrogen/methane flames using a co-flow burner. The study considers varying hydrogen mole fractions of 0.1, 0.3, and 0.5, and different fuel flow velocities of 2.0, 6.3, and 8.0 cm/s. To introduce DC electric fields, a high voltage terminal was connected to the fuel nozzle, while the ground terminal was connected to an upper mesh located above the flame. The applied DC voltages ranged from V dc = -10 kV to +10 kV. The study reveals that the addition of hydrogen reduces flame height. Furthermore, when subjected to DC electric fields, the flames exhibit movement towards the lower potential side, displaying stable and oscillating behaviors due to the Lorentz force acting on positive ions within the flames. The concentrations of CO and CO 2 exhibit insignificant changes with varying hydrogen mole fractions. However, when exposed to positive voltage, CO, CO 2 , and NO X emissions are reduced. This research provides a detailed analysis of flame/flow behavior and emission characteristics when hydrogen and DC electric fields are introduced, providing valuable insights into the control of flame behavior and pollutant","PeriodicalId":217894,"journal":{"name":"Journal of Advanced Marine Engineering and Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139308550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Initial structural design approach for jacket-type substructure in 12 MW class offshore wind turbines considering soil stiffness 考虑土壤刚度的 12 兆瓦级海上风力涡轮机夹套型下部结构的初步结构设计方法

Journal of Advanced Marine Engineering and Technology Pub Date : 2023-10-31 DOI: 10.5916/jamet.2023.47.5.252

Joo-Shin Park, Seon-Hyeok Kim, Jung-Kwan Seo

{"title":"Initial structural design approach for jacket-type substructure in 12 MW class offshore wind turbines considering soil stiffness","authors":"Joo-Shin Park, Seon-Hyeok Kim, Jung-Kwan Seo","doi":"10.5916/jamet.2023.47.5.252","DOIUrl":"https://doi.org/10.5916/jamet.2023.47.5.252","url":null,"abstract":": The wind power industry continues to grow, driven by environmental concerns such as achieving carbon neutrality, which has recently gained prominence. Creating wind farms poses several challenges due to limited land availability and insufficient wind resources. Consequently, offshore wind projects are garnering attention, particularly in domestic conditions. Notably, the Southwest Sea of Korea exhibits the highest offshore wind potential and has validated this potential through demonstrations. The primary geological characteristic of the Southwest Sea is a weak clay layer. To ensure the stable operation of generators, enhancing the precision of the substructure becomes imperative. This study presents an engineering procedure for developing a jacket-shaped wind turbine sub-structure, which was analyzed to assess the impact of soil properties on structural strength. In a previous study, wind turbine capacity targeted 5 MW. However, in alignment with the technological trend in the Southwest Sea offshore wind turbine market, this analysis model focuses on the 12 MW class. The structural response under varying soil conditions was verified using data from the North Sea, Mexico Bay, and Southwest Sea. The findings of this study not only contribute to designing structurally sound wind turbine substructures but also serve as essential reference data for engineers in related fields, providing insights into structural safety design and analytical verification processes.","PeriodicalId":217894,"journal":{"name":"Journal of Advanced Marine Engineering and Technology","volume":"332 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139309047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Implementation of a real-time small draft observation system using triangular correction algorithms 利用三角校正算法实现实时小吃水观测系统

Journal of Advanced Marine Engineering and Technology Pub Date : 2023-06-30 DOI: 10.5916/jamet.2023.47.3.137

Young-Gwan Kang, Sang-Woo Kim, Woo-Jin Lee, J. Yim

引用次数: 0

The feasibility of ammonia as marine fuel and its application on a medium-size LPG/ammonia carrier 氨作为船用燃料的可行性及其在中型LPG/氨运输船上的应用

Journal of Advanced Marine Engineering and Technology Pub Date : 2023-06-30 DOI: 10.5916/jamet.2023.47.3.143

Muammer Akturk, Jung-Kwan Seo

引用次数: 1

A study on light weight of radar-based human activity recognition model using self-attention mechanism 基于自注意机制的雷达人体活动识别模型轻量化研究

Journal of Advanced Marine Engineering and Technology Pub Date : 2023-06-30 DOI: 10.5916/jamet.2023.47.3.131

Seong-Beom Jeong, Hong-Il Seo, Gi-Do Choi, D. Seo

{"title":"A study on light weight of radar-based human activity recognition model using self-attention mechanism","authors":"Seong-Beom Jeong, Hong-Il Seo, Gi-Do Choi, D. Seo","doi":"10.5916/jamet.2023.47.3.131","DOIUrl":"https://doi.org/10.5916/jamet.2023.47.3.131","url":null,"abstract":": Recently, radar-based human activity recognition (HAR) technology has been actively studied in the field of artificial intelligence by applying radar datasets to deep learning (DL) models to automatically learn and classification. This is one of the important applications in the field of activity recognition and can be used in various fields, such as exercise tracking, smart homes, self-driving cars, and health status monitoring, by recognizing human daily activity patterns. However, DL models are complex and have significant computational costs and numerous parameters to process and classify high-dimensional radar datasets. Therefore, their implementation on commercial mobile devices is limited by their computational complexity. Therefore, in this study, we propose a lightweight HAR DL model using Self-Attention technology to solve the complexity and computational costs of these DL models. Experimental results demonstrate that this model can maintain its performance while reducing the number of parameters required. In the future, these light-weight models will not only be usable on mobile devices but will also require lower computing power and memory capacity; therefore, they are expected to be used in various fields as time series-based DL models.","PeriodicalId":217894,"journal":{"name":"Journal of Advanced Marine Engineering and Technology","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122021343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Using Tesla turbine for waste heat recovery: Currents status and future directions 利用特斯拉涡轮进行废热回收:现状与未来方向

Journal of Advanced Marine Engineering and Technology Pub Date : 2023-06-30 DOI: 10.5916/jamet.2023.47.3.105

Jinwon Jung, Anh Duong Phan, Borim Ryu, Hokeun Kang

{"title":"Using Tesla turbine for waste heat recovery: Currents status and future directions","authors":"Jinwon Jung, Anh Duong Phan, Borim Ryu, Hokeun Kang","doi":"10.5916/jamet.2023.47.3.105","DOIUrl":"https://doi.org/10.5916/jamet.2023.47.3.105","url":null,"abstract":": Waste heat recovery (WHR) has gained significant attention as a promising approach to enhance system performances and reduce greenhouse gas emissions. The Tesla turbine, known for its simplicity, reliability, good off-design performance, a simple structure, easy operation cleaning and maintenance, no blade corrosion, and low manufacturing costs, has emerged as a promising technology for waste heat recovery applications. This paper provides an extensive evaluation of the present state and prospective pathways concerning the utilization of Tesla turbines in waste heat recovery applications. The outline of Tesla turbine and its operating principles, highlighting its advantages and limitations, are introduced. A summary of the available literature on the utilization of Tesla turbines for waste heat recovery in different industrial sectors, including power plants, automotive, manufacturing, and renewable energy systems, is performed. The performance and energy conversion efficiency of Tesla turbines in these applications are critically evaluated. Furthermore, this review discusses the challenges and technical barriers associated with the implementation of Tesla turbines for WHR. It also identifies potential future research directions and suggests innovative strategies to enhance the performance and reliability of Tesla turbine-based WHR systems. These include application area in liquefied natural gas supply system and boil-off-gas return configuration. In conclusion, this review highlights the significant potential of Tesla turbines for waste heat recovery and emphasizes the need for further research and development efforts to overcome the existing challenges. The findings of this review can guide researchers and engineers in the design and implementation of efficient and sustainable waste heat recovery systems using Tesla turbine technology.","PeriodicalId":217894,"journal":{"name":"Journal of Advanced Marine Engineering and Technology","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123710814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1