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SUBMERSIBLE OUTBOARD ELECTRIC MOTOR PROPULSOR

NAVAL ENGINEERS JOURNAL 1989年第5期101卷 44-52页

作者： BROWN, DW REPP, JR TAYLOR, OS D. W. Brown is an engineer at the Westinghouse Research and Development Center. He received a B.S. in mechanical engineering from Michigan Technological University and an M.S. in mechanical engineering from Michigan State University. Mr. Brown joined Westinghouse in 1986 and has since worked on such projects as the testing and analysis of current collection apparatus the design of shaft and bearing arrangements for high speed electrical motors and the design of a submersible electric motor. He also has experience in the use and analysis of fiber-reinforced composites at room temperature and at cryogenic temperatures. This knowledge of composites was applied to a study involving a fibrous composite robot arm. Mr. Brown is working on the rotor design of a cryogenically cooled AF generator and also the design of the vertical motor test facility for the Motor Silencing Program. Jeffrey R. Repp is a senior engineer with Westinghouse Research and Development Center. He received a B.S. in electrical engineering from Pennsylvania State University an M.S. in electrical engineering from the University of Cincinnati and an M.B.A. in management/industrial management from Xavier University. Mr. Repp has 13 years of experience in the field of electrical engineering specializing in the design and analysis of electromagnetic devices. This experience includes the development design testing and analysis of a wide variety of electric motors ranging from fractional horsepower permanent magnet motors through large (10000 hp) synchronous and induction motors. Mr. Repp has been directly involved in the electromagnetic and thermal analyses of machines utilizing state-of-the-art finite element and computer graphic techniques. Most recently he has been concerned with the development of electronically commutated permanent magnet (brushless dc) products. Mr. Repp is a Member Institute of Electrical and Electronics Engineers IEEE Power Engineering Society. O. S. Taylor is manager of electromechanical applications at the Westin

Mr. Taylor has more than 18 years of experience in the field of research and development engineering. Since joining Westinghouse in 1974 he has been involved in the design and development of advanced electrical machinery including large, high power density motors for electric drive ship propulsion, pulsed homopolar generators for electromagnetic launchers, high current density contacts for switching applications, research in automated manufacturing, and robotic system development. He is currently managing a section that deals with rotating power equipment for military applications, with emphasis on thermal and electromagnetic modeling. ABSTRACT A demonstration submersible outboard electric motor/ propulsor has been designed, built, and successfully tested. This concept involves mounting a propeller directly inside a rotor of a specially designed induction motor. This motor/ propulsor has the advantages of direct seawater cooling and bearing lubrication, direct drive, shrouded propeller, variable positioning, easy access, and high maneuverability. The motor/propulsor is readily adaptable to dual, independently-controlled and contra-rotating propellers without the need for gears. The concept has been investigated conceptually for application to primary propulsion, secondary propulsion, and pod drives, for amphibious, surface, and undersea vehicles.

关键词： Ship Propulsion

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Simulation of arrow-shaped micromixer with obstacles in blood plasma mixing

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AIP Conference Proceedings 2024年第1期3080卷

作者： Ziyan Muhammad Aqsha Basari Mohammad Akita Indianto Ridho Irwansyah Muhammad Satrio Utomo Siti Fauziyah Rahman Biomedical Engineering Study Program Department of Electrical Engineering Faculty of Engineering Universitas Indonesia Kampus UI Depok West Java 16424 Indonesia Research Center for Biomedical Engineering Faculty of Engineering Universitas Indonesia Kampus UI Depok West Java 16424 Indonesia Energy Systems Engineering Graduate Program Faculty of Engineering Universitas Indonesia Kampus UI Depok West Java 16424 Indonesia Department of Mechanical Engineering Faculty of Engineering Universitas Indonesia Kampus UI Depok West Java 16424 Indonesia Research Center for Metallurgy National Research and Innovation Agency Komplek PUSPIPTEK Setu Tangerang Selatan Banten 15314 Indonesia

In recent years, several applications of micromixers have been reported to have a number of advantages, including the use of small amounts of plasma, short reaction times, and good reaction efficiency. The samples analyzed in this study were blood plasma and distilled water. The process is carried out by passive mixing which is based on a microchannel structure to enhance the diffusion of molecules for efficient mixing. The arrow shape was chosen as the micromixer design because it has a better blending performance than the T and Y shapes. The types of obstacles also used to improve the mixing process. The simulation was carried out on COMSOL Multiphysics software version 5.6. The results showed better mixing results for the micromixer design with triangle right facing obstacles with the highest Reynolds number was 9.4326. Then followed by ellips obstacles with a value of 9.4322, then without obstacles that is 9.4309, after that the triangle left facing with a value of 9.4006, and finally the lowest Reynolds number is a design with a diamond obstacles of 9.2514.

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The dynamic model of paddy field conversion control in Citarum watershed

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IOP Conference Series: Earth and Environmental Science 2019年第1期399卷

作者： I Firmansyah Widiatmaka B Pramudya S Budiharsono Study Program of Natural Resources and Environmental Management IPB University Department of Soil Science and Land Resources Faculty of Agriculture IPB University Department of Mechanical Engineering and Biosystem Faculty of Agriculture Technology IPB University Technical Advisor Ministry of National Development Planning/National Development Planning Agency (BAPPENAS)

The rate of population growth and the increase in food needs for consumption have made the need for paddy fields higher. On the other hand, the pressure on paddy fields is quite intense so that the conversion of paddy fields is quite challenging to be controlled. Moreover, the concerns about food security and food sovereignty have become critical issues. The high demand for land utilization has caused pressure on paddy fields in the Citarum watershed. The objective of this study is to build a model for maintaining paddy fields in the Citarum watershed. The study was conducted from June to September 2015. The method of this research is a modelling using system dynamics approach by simulating time series data. From the simulation, it can be concluded that the rate of conversion of paddy fields will still be high if there is no specific policy in its protection. This fact can be seen from various scenario conditions, either in existing circumstances, in the optimistic scenario, as well as in a moderate scenario. The strategy that can be done is that paddy fields should be specially protected or owned by the government to minimize the rate of conversion.

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Linearization of two-state thruster models

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Journal of Physics: Conference Series 2020年第1期1490卷

作者： Dieky Adzkiya Hendro Nurhadi Teguh Herlambang Department of Mathematics Institut Teknologi Sepuluh Nopember Indonesia Center of Excellence for Mechatronics and Industrial Automation Research Center Institut Teknologi Sepuluh Nopember Indonesia Department of Industrial Mechanical Engineering Institut Teknologi Sepuluh Nopember Indonesia Study Program of Information Systems Universitas Nahdlatul Ulama Surabaya Indonesia

A thruster is a device used for station keeping, attitude control, in the reaction control system, or long-duration, low-thrust acceleration. Thruster is one of the main components in autonomous surface vehicle. In th...

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Computer Modelling of the Information Properties of Hyper Chaotic Lorenz System and Its Application in Secure Communication System

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Journal of Physics: Conference Series 2021年第1期1764卷

作者： Volodymyr Rusyn Mujiarto Mustafa Mamat Firmansyah Azharul W. S. Mada Sanjaya Aceng Sambas Estiyan Dwipriyoko Akhmad Sutoni Yuriy Fedkovych Chernivtsi National University Kotsybynsky str. 2 Chernivtsi 58012 Ukraine. Department of Mechanical Engineering Universitas Muhammadiyah Tasikmalaya Indonesia Faculty of Informatics and Computing Universiti Sultan Zainal Abidin Kuala Terengganu Malaysia Department of Mechanical Engineering Sekolah Tinggi Teknologi Cileungsi Indonesia Department of Physics Universitas Islam Negeri Sunan Gunung Djati Bandung Indonesia Informatics Study Program Universitas Langlangbuana Bandung Indonesia Department of Industrial Engineering Universitas Suryakancana Cianjur Indonesia

This paper presents computer modeling, analysis and research of the hyper-chaotic Lorenz system based on programming interface that has been developed in LabView software environment. This study allows for generating and research of the main information properties of hyper-chaotic Lorenz system, focusing on time distribution of the four chaotic coordinates, phase portraits and Lyapunov exponents. The programming interface demonstrates the algorithm of masking and decrypt of the information carrier.

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Quantum sensor in a single layer van der Waals material

arXiv

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arXiv 2021年

作者： Babar, Rohit Barcza, Gergely Pershin, Anton Park, Hyoju Lindvall, Oscar Bulancea Thiering, Gergo Legeza, Örs Warner, Jamie H. Abrikosov, Igor A. Gali, Adam Ivády, Viktor Department of Physics Chemistry and Biology Linköping University LinköpingSE-581 83 Sweden Wigner Research Centre for Physics PO Box 49 BudapestH-1525 Hungary Walker Department of Mechanical Engineering and Materials Graduate Program Texas Materials Institute The University of Texas at Austin AustinTX78712 United States Fachbereich Physik Philipps-Universität Marburg Marburg35032 Germany Institute for Advanced Study Technical University of Munich Lichtenbergstrasse 2a Garching85748 Germany Department of Atomic Physics Budapest University of Technology and Economics Budafoki út 8. BudapestH-1111 Hungary Max-Planck-Institut für Physik komplexer Systeme Nöthnitzer Street 38 DresdenD-01187 Germany

Point defect qubits in semiconductors have demonstrated their outstanding high spatial resolution sensing capabilities of broad multidisciplinary interest. Two-dimensional (2D) semiconductors hosting such sensors have recently opened up new horizons for sensing in the subnanometer scales in 2D heterostructures. However, controlled creation of quantum sensor in a single layer 2D materials with high sensitivity has been elusive so far. Here, we report on a novel 2D quantum sensor, the VB2 centre in hexagonal boron nitride (hBN), with superior sensing capabilities. The centres inherently low symmetry configuration gives rise to unique electronic and spin properties that implement a qubit in a 2D material with unprecedented sensitivity. The qubit is decoupled from its dense spin environment at low magnetic fields that gives rise to the reduction of the spin resonance linewidth and elongation of the coherence time. The VB2 centre is also equipped with a classical memory that can be utilized in storing population information. Using scanning transmission electron microscopy imaging, we confirm the presence of the point defect structure in free standing monolayer hBN created by electron beam irradiation. Our results provide a new material solution towards atomic-scale sensing in low dimensions. © 2021, CC BY.

关键词： III-V semiconductors

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Designing of Android Based Learning (Mobile Learning) for Multidiscipline Students

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Journal of Physics: Conference Series 2020年第2期1569卷

作者： SC Wibawa IKD Nuryana IGPE Prismana DA Dermawan A Manyu A Frianto E Rahmadyanti DE Susetyaningsih N Shofiyah RM Yusron Mashudi Informatics Engineering Department Universitas Negeri Surabaya Indonesia 60231 Economics Department Universitas Negeri Surabaya Indonesia 60231 Civil Engineering Department Universitas Negeri Surabaya Indonesia 60231 Center of Information Technology Development Universitas Negeri Surabaya Indonesia Culinary Department Vocational State High School of 8 Surabaya Indonesia 60231 Department of Mechanical Engineering University of Trunojoyo Madura Indonesia Islamic Education Study Program The State Islamic Institute of Jember (IAIN) Indonesia 68136

A breakthrough in the multimedia field is needed by creating varied learning strategies to attract students' interest in learning. The purpose of this study is to create learning media M-Learning to support the learning process in Vocational High School and to know the level of prevalence M-Learning as a medium of learning. The research method using Research and Development which has eight stages: 1) Identification of Research Needs, 2) Purpose Formulation, 3) Formulation of material items, 4) Formulation of success tools, 5) Media manuscript formulation, 6) Tests or product trials, 7) Revisions, 8) Manuscripts are ready to be produced. This media is developed using Android Studio. The result of this research is a dynamic Android-based application that is run online as a supporter of learning. The results of validator assessment and student response can be obtained from the media expert value at 65% in the sense of valid, acquiring a low score due to a lot of revision of the application. According to the material experts, the media obtains the value of 85% which means valid, and a validity score of 94.7% is obtained from students' responses that mean valid. The conclusion shows that validator assessments of learning media can be used as supporting self-study, especially for multidiscipline students.

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Soil organic matter in various land uses and management, and its accuracy measurement using near infrared technology

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IOP Conference Series: Materials Science and engineering 2020年第3期830卷

作者： B H Kusumo A Purwanto H Idris S Sukartono L E Susilowati B Bustan Department of Soil Science Faculty of Agriculture University of Mataram JL. Majapahit 62 Mataram Lombok NTB Indonesia Postgraduate Studies University of Mataram JL. Pendidikan 37 Mataram Lombok NTB Indonesia Department of Mechanical and Biosystem Engineering IPB University Indonesia Forestry Study Program Faculty of Agriculture University of Mataram JL. Pendidikan 37 Mataram Lombok NTB Indonesia

The aim of this study is to investigate the soil organic matter (SOM) status in various land uses and management in Kayangan Sub-District, North Lombok, and its accuracy measurement using near infrared spectroscopy (NIRS). A total of 100 soil samples (0-10 cm depth) were collected from several land uses and management (rain-fed areas, irrigated areas, areas planted 1-3 times with seasonal crops, areas planted with 1-3 perennial plants) in the study area, which were dried, ground and sieved, then analyzed using Walkley and Black method and scanned using near infrared spectroscopy (NIRS). Partial least square regression (PLSR) was used to create SOM prediction models. The results showed that the SOM content varied from very low to moderate with most of them were low. The content of SOM was significantly higher in the irrigated areas compared to that of in the rain-fed areas, and also higher in the areas planted with seasonal crops 3 times a year compared to the areas planted 1-2 times a year. SOM content was higher in areas planted with 2-3 types of perennial plants, compared to with 1 type of perennial plant. NIRS technology was moderately accurate in measuring SOM, which can be used to monitor spatially changes in SOM.

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The stability of calibration model in measuring and mapping soil organic matter in a dry climatic area

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IOP Conference Series: Earth and Environmental Science 2021年第1期824卷

作者： B H Kusumo M H Idris Sukartono Mulyati L E Susilowati L A A Bakti Baharudin Y A Purwanto Bustan Department of Soil Science Faculty of Agriculture University of Mataram JL. Majapahit 62 Mataram Lombok NTB Indonesia Postgraduate Studies University of Mataram JL. Pendidikan 37 Mataram Lombok NTB Indonesia Forestry Study Program Faculty of Agriculture University of Mataram JL. Pendidikan 37 Mataram Lombok NTB Indonesia Department of Mechanical and Biosystem Engineering IPB University Indonesia

The increase of atmospheric CO2 concentration from soil organic matter (SOM) decomposition may contribute to the global warming and climate change. So, sequestering this greenhouse gas into SOM may be used to mitigate climate change. However, tedious procedures in measuring and mapping SOM need to be replaced with a method which works based on the reliability of calibration model developed. This research aimed to test the reliability of the calibration model that was built from a separate soil sample group to be used to measure and map SOM on other validation soil sample group, in the mostly dry climatic area of Kayangan Sub-district, North Lombok Indonesia. For this purpose, 300 soil samples were collected from the area using grid method, which were then dried, ground, sieved, analysed for SOM content using the Walkley and Black method, and scanned using Near Infrared Spectroscopy. The model built using calibration sample group was able to reliably measure and map the SOM content of the spectral data collected from the validation sample set. This is shown by the coefficient of determination (R2V = 0.79), root mean square error (RMSEV = 0.246%) and the ratio prediction to deviation (RPDV = 2.09). SOM maps generated from both laboratory and near infrared method can show very low, low and medium SOM content. These maps can be further used as a reference for applying organic fertilizers, avoiding excessive use of fertilizers, and monitoring soil carbon sequestration in mitigating climate change.

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The influence of shooting conditions during shot peening of stainless steel on surface roughness

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IOP Conference Series: Materials Science and engineering 2020年第1期885卷

作者： M. Iqbal Mukhsen Rusdi Nur M. Alif AF Yusuf Christo Rakka Mechanical Engineering Department Politeknik Negeri Ujung Pandang Jl. Perintis Kemerdekaan Km. 10 Makassar 90245 South Sulawesi Indonesia Center for Materials and Manufacturing Politeknik Negeri Ujung Pandang Jl. Perintis Kemerdekaan Km. 10 Makassar 90245 South Sulawesi Indonesia Student of Manufacturing Engineering Study Program Politeknik Negeri Ujung Pandang Jl. Perintis Kemerdekaan Km. 10 Makassar 90245 South Sulawesi Indonesia

Stainless steel AISI 316L is a suitable material used for orthopedic purposes. In order to improve the hardness of stainless steel, the heat-treatment process cannot be done, but with a shot peening process. This study aims to determine the roughness of the workpiece surface and investigate the effect of shooting conditions (i.e., angle and time) on the surface roughness during shot peening of Stainless steel AISI 316L. The shooting parameters used are 2, 4, and 6 minute for the duration, and angle of 0°, 15°, 30° and 45°. The ball material is a type of steel with 0.6mm in diameter. The experimental results presented that the increased shooting time will result in lower surface roughness, and vice versa. Therefore, it can be concluded that the use of varying shooting conditions will greatly affect the quality of the surface produced but needs to be compared with other responses, namely hardness.

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