... Designing and optimizing a propulsion system is twofold. The first step is to choose the main components, such as engine ratings, engine types, propeller type and propeller diameter. The second step is taken when all the main parameters as set and the propeller design itself needs to be designed...

... on ship owner’s experience. The time-dependent ship performance is an essential topic for ship owners because if they realize their current ship performance, they can implement something such as hull or propeller cleaning for their economical operation. This study is focused on the usage of noon report...

... In the preliminary design of a propulsion unit the selection of propeller diameter is most commonly based on open water tests of systematic propeller series. The optimum diameter obtained from the propeller series data is however not considered to be representative for the operating conditions...

... vibration calculation case-3 propeller propulsion calculation case-1 diagram stiffness knowledge management rotor whirling vibration vibration analysis equation whirling vibration analysis vibration whirling vibration calculation shaft matrix bearing resonance Since 1869...

... propeller blade plane ellipse helical surface curvature rake propeller axis generator line holst helix line axis blade diagram blade propeller perpendicular helix surface intersection vertical axis propeller A method is proposed for generating the developed blade drawing...

... Stern tube lubricants; used to lubricate the bearings that support the vessel propeller shaft in the stern tube, are continuously lost to the marine environment while the ship is moving under power. Although the specific amount of lubricant lost in a stern tube application is dependent...

... Once a propeller is designed, the geometry must be produced One of the most common manufacturing methods for modern propellers is to produce a thickened casting so that the final geometry can be machined through grinding or milling. To ensure the casting will encompass the final geometry...

... With the aid of detailed numerical flow simulations it has become possible to determine the isolated propeller blade load during a revolution. The load fluctuation on a single propeller blade can be clearly related to the inflow velocity field. Once the time dependent load, and consequently...

... During the last decades, MARIN has been developing sophisticated measuring systems to capture dynamic loads on the propeller shaft of azimuthing propulsors, in order to support the industry in studying various phenomena and understanding the physics. These measuring systems are designed so...

... Practical Considerations for Optimization of Propulsion Efficiency in Commercial Vessels Cliff Burns (M) Sound Propeller Services Inc, Mike Wiegand (M) Sound propeller systems LLC ABSTRACT In this paper the focus is not regarding any one particular type of vessel, but is to call attention...

...A Hybrid Viscous/Potential Flow Method for the Prediction of the Wetted and Cavitating Performance of Ducted Propellers Spyros A. Kinnas (M), Chan-Hoo Jeon, Ye Tian Ocean Engineering Group, Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin...

...Open Water Performance of a Feathering Propeller Steven Guglielmoni (SM), Jacques B. Hadler (HM) Webb Institute, Glen Cove, New York ABSTRACT In recent years, a number of propeller designs have been developed that aim to reduce the resistive characteristics of sailboat propellers when not in use...

... This paper presents computational techniques to predict the fully unsteady interaction of two hydrofoils (rotor and stator) and to calculate the unsteady trailing wake geometry in the case of a propeller. A boundary element method is developed to simulate the unsteady performance of moving...

... forms can be evaluated for use with pod drives. A look at the integration of pod systems into various types of pleasure boats (cruiser, day boat, fishing yacht, etc) is also covered including the challenges which exist for each specific vessel type. submerged propeller engine pleasure boat...

... is described here and compared with the performance of a baseline shaft and strut mounted propulsor. This hybrid contra-rotating configuration uses twin tractor propulsion pods to power the aft propellers of the contra-rotating set, where the forward propellers are powered by conventional shaft lines...

... 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...

... The Webb Hydroflite Propeller Series (WHPS) consists of four matching pairs of three-bladed ten-inch-diameter pleasure craft propellers with P/D ratios varying from 0.6 to 1.2. Recently, one propeller from each matching pair was modified with a uniform trailing edge cup. Cupping is a widely...

... This paper presents the analysis of the performance for podded and ducted propellers using a hybrid numerical method, which couples a vortex lattice method (MPUF-3A) for the unsteady analysis of propellers and a viscous flow solver (NS-3X or FLUENT) for the prediction of the viscous flow around...

... To improve the prediction of the alternating blade loading under ship turning conditions, a test was conducted in a rotating arm facility, where propeller hub loads were measured on a combatant propeller/hull configuration. To obtain the alternating blade forces, three propeller configurations...

... A new method for automatic optimization of an initial design of open and ducted propellers is illustrated in the paper. The method is based on a B-Spline based parametric representation of the main geometric parameter of the propeller blades, such as pitch and chords distributions along...