... Recently, the big data can be employed as the economical ship operating or evaluation of ship performance conditions. However, such data cannot be easily obtained and analyzed for every ship. In this case, for example, an evaluation of ship performance during operation is usually dependent...

... An objective evaluation of different propulsion concepts for naval frigates has been demonstrated. Based on an assumed operation profile and weighting of criteria stated herein, hybrid-propulsion arrangements incorporating electric drives have been observed to optimally meeting the specified...

... Stern tube seals are a critical component in a ships propulsion system, sealing the shafts penetration through the hull. Stern tube seals can result in a significant maintenance burden when they are unable to handle the operational conditions of the vessel. Current systems are also lacking...

... shaft sleeve sleeve replacement diameter operation sleeve fit area acceptance criteria shaft water intrusion navsea defect replacement machining welding process welding end detail Maintenance of Propulsion Shaft Split Sleeves Tina Burke Roy McCausey David Norris Michael Scibelli, P.E...

... of several stern tube bearing failure cases, hereby trying to ensure a robust design for all kinds of operation. After investigation of the damages, a root cause analysis is possible. In particular, the investigations focus on review of the design of the shaft alignment and the correct performance...

... Early propeller shafts operated in water lubricated lignum vitae bearings and used stuffing boxes as seals at hull penetrations. The bearings, however, required regular replacement, and the stuffing boxes not ideal as seals. Around 60 years ago, new seals were developed that allowed the use...

... on a platform supply vessel. subsea system upstream oil & gas marine transportation od shaft fatigue failure shaft bearing calculation intermediate shaft speed range fatigue strength stress amplitude inner ring operation stress concentration factor safety factor amplitude shaft...

... Propeller cavitation, with all its noise, vibration, erosion, etc. is largely the consequence of blade lift fluctuations when operating in non-uniform inflow. It is easily shown, on the basis of simple low-aspect-ratio approximations, that forward-skew reduces the lift/incidence slope...

... thrust bearing supplied for the Japanese Techno Super Liner project are also presented. friction break away thrust collar thrust bearing simmons babbitted pad ptfe coefficient operation mpa thrust block application journal pad reduction babbitt thrust pad lbf hydrodynamic bearing...

..., leading-edge separation, and unsteady ring vortices induced by propeller operations under off-design conditions. In this study, time-domain simulations are performed for the DTRC 4I18 propeller under ahead, bollard pull, crash-ahead, crash-astern, and backing conditions and compared with the available...

... elements of the theory are presented. marine transportation damper strength torsional damper intermediate shaft shaft design torque operation amplitude diesel engine shaft dnv major critical resonance propeller full pitch vibration design option 1 resonance Det Norske Veritas...

... the lowest fuel consumption. The corresponding throttle and pitch settings can then be programmed into a software-based control system to implement the most fuel-efficient pitch schedule. Analyses are presented for a diesel-powered US Coast Guard WLB, a USCG High Endurance Cutter operating in gas turbine...

...-carrying staves in place in the new bearings, resulting in simplified (lower cost) housings. us government elastomer demountable bearing friction thickness radial load lubrication contact pressure diameter bearing design weight loss coefficient operation super demountable bearing...

... radius fraction variation blade thickness operation blade section exceptional load limit state loading ice class propeller propeller section modulus canada interaction equation blade out-of-plane Proposals for Design Methodologies for Ice Class Propellers Neil Bose1· (M), Brian Veitch2...

... alloys are summarized. These propellers have high specific strength and corrosion resistance in sea water. In addition, the design of these propellers was changed to have large skew to reduce the cavitation effects on the inclined propeller operation. Steel shafting with oxide coatings and graphite...

...-inception properties of the blade sections are determined and an empirical prediction of tip-vortex cavitation inception is included. Noise levels are estimated for operation with extensive cavitation on the blade. Several blade-pitch motions are evaluated and it is found that various forms of modified...

... that production efficiency can often be greatly improved with little or no degradation of the final product. upstream oil & gas propeller production ball mill cutter machining practice machining path feedrate ship propeller milling operation lead angle productivity toroidal cutter face mill...

... An efficient and user-friendly analysis package (approach) has been developed to assess commercial skewed propeller loading and blade stresses and deflections during steady backing and crashback operations. Predictions of backing and crashback pressure distributions on blade surfaces...

... Strength requirements on propellers in backing operations are hardly defined but they are found necessary for highly skewed propellers. The present paper illustrates how the MARIN design procedure copes with this aspect. Relevant analysis conditions for backing operation and allowable stress...

... propellers operate fully wetted. The two different operating modes are achieved by adjusting a hinged split flap at the semi-duct inlet ramp. Design and evaluation of the so-called hybrid propulsion system are based on a case study. They comprise the hydrodynamic design of a 6-bladed propeller as well...