نتایج جستجو برای: stabilizer (marine vessel)
تعداد نتایج: 182853 فیلتر نتایج به سال:
یکی از مهمترین حرکات شش گانه شناور حرکت غلتش عرضی می باشد. اهمییت این حرکت از آن جهت است که آثار نامطلوبی بر سازه کشتی، قابلیت مانور، کارآیی تجهیزات جنگی، آرامش مسافرین و میزان مصرف سوخت شناور و ... دارد یکی از مهمترین ابزارهای کاهش حرکت غلتش عرضی باله های پایدار کننده می باشد. میزان نیروی ایجاد شده توسط باله ها یا تغییر زاویه باله کنترل می گردد. بدین ترتیب این تحقیق دارای دو بخش کلی تحلیل نیرو...
Flapping foils for augmenting thrust production have drawn attention as a means of assisting ship propulsion in waves due to their high efficiency rate compared traditional screw propellers. However, they can also offer substantial resistance reduction when used stabilizers. In this work, the aim is investigate feasibility symbiotic concept combining ship’s propeller with foil arranged at bow f...
چکیده ندارد.
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In this research, the effects of foulings on the outer surface of a marine vessel have been studied using the Computational Fluid Dynamics (CFD) methods. To this end, a proper turbulence model was considered and validated for the simulations. The simulation results for different fouling grades indicated that existing of a thin layer of slime could make 4.58 % increase in drag force; however, fo...
Theoretical study of vibration stabilizer with feedback on displacement integral for power equipment
Reducing the vessel hull vibration caused by power equipment is usually obtained effective vibration-isolating fastening. Vibration impact on mechanisms and automation tools greatly reduces their reliability, affects health of passengers crew members. Despite modern vibration-insulating materials compensators, problems eliminating variable forces transmitted from source have not been fully solv...
Chronic anthropogenic underwater noise, such as vessel noise, is now recognized as a world-wide problem. Marine noise from vessels, ranging from super tankers to small motorboats is increasingly recognized as being both a persistent and pervasive pollutant. Furthermore, due to its spatial and temporal variability, vessel noise pollution represents a particular challenge for marine conservation,...
The natural barriers to species invasions that exist in isolated marine environments such as Hawaii are overcome by anthropogenic influences on the dispersal patterns of marine organisms. This creates a situation where the marine habitats of the Hawaiian Archipelago are more readily exposed to marine non-indigenous species. A case study of a particular anthropogenic dispersal mode, maritime ves...
The evolution of the use of electricity in marine vessels is presented and discussed in this article in a historical perspective. The historical account starts with its first commercial use in the form of light bulbs in the SS Columbia in 1880 for illumination purposes, going through the use in hybrid propulsion systems with steam turbines and diesel engines and transitioning to our days with t...
Maritime domain awareness is critical for protecting sea lanes, ports, harbors, offshore structures and critical infrastructures against common threats and illegal activities. Limited surveillance resources constrain maritime domain awareness and compromise full security coverage at all times. This situation calls for innovative intelligent systems for interactive situation analysis to assist m...
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