PRESSURE FIELD NEAR COUNTERROTATING PROPELLERS (2005)
Expressions for the vibratory pressure field produced by an operating counterrotating propeller system are developed in terms of first and second blade harmonics of individual propellers. The...
PRESSURE FIELD AROUND A MARINE PROPELLER OPERATING IN A WAKE (2005)
TSAKONAS,S., BRESLIN,J.P., JEN,N.
An investigation was made on the effect of nonu iform inflo conditions on the vibra ory pressure generated by a marin prop ll r I a aly ing he pres ure signals which are associated with propeller...
Propeller-Induced Velocity Field by Means of Unsteady Lifting Surface Theory. (2005)
An analysis based on lifting surface theory has been developed for evaluation of the vibratory velocity field induced by an operating marine propeller in both uniform and nonuniform inflow fields....
Propeller-Rudder Interaction Due to Loading and Thickness Effects. (2005)
Tsakonas,S., Jacobs,W. R., Ali,M. R.
The previous analysis of the propeller-rudder interaction problem by means of the lifting surface theory has been modified to include the effects of thickness of both surfaces. The effect of...
Propeller-Induced Velocity Field due to Thickness and Loading Effects. (2005)
Blade thickness palys a dual role, contributing to the lifting characteristics of the blade because of its nonplanar form as well as to its non-lifting characteristics due to the generation of a...
UNSTEADY PROPELLER LIFTING-SURFACE THEORY WITH FINITE NUMBER OF CHORDWISE MODES, (2005)
Tsakonas,S., Jacobs,W. R., Rank,P. H. , Jr
A continuing investigation is concerned with improvement of the mathematical model developed for the evaluation of the steady and time-dependent loading distributions on the blades of marine...
An Exact Linear Lifting-Surface Theory for a Marine Propeller in a Nonuniform Flow Field. (2005)
Tsakonas,S., Jacobs,W. R., Ali,M. R.
The mathematical model used in previous Davidson Laboratory adaptations of linearized unsteady lifting surface theory to marine propellers has been revised by removing the so-called 'staircase'...
THREE DIMENSIONAL APPROACH TO THE GUST PROBLEM FOR A SCREW PROPELLER, (2005)
The unsteady lifting surface approach is utilized for the marine propeller case and the correspond ing surface integral equation is solved for the Weissinger mathematical model. The applicability of...
Tsakonas,S., Chen,C.Y., Jacobs,W.R.
In one instance, an infinitely long elastic beam with circular cross section and in another an in finite elastic plate are immersed in an acoustic fluid parallel to an operating marine propeller. The...
Propeller-Duct Interaction Due to Loading and Thickness Effects. (2002)
Tsakonas,S., Jacobs,W. R., Ali,M. R.
This study is a continuation of an earlier investigation dealing with the interaction of a propeller and its enshrouding nozzle when both are operating in a nonuniform inflow field. The present...
Waves Generated by a Uniformly Moving Oscillatory Surface Effect Ship. (2002)
An air-cushion supported vehicle and the surface effect ship-type operating on the interface of two media (air and water) is a multi-parameter system influenced by the hydrodynamics of the fluid...
Propeller Blade Pressure Distribution due to Loading and Thickness Effects. (2002)
Tsakonas,S., Jacobs,W. R., Ali,M. R.
A theoretical approach is developed and a computational procedure adaptable to a high speed digital computer is established for the evaluation of the blade pressure distribution of a marine propeller...
Steady and Unsteady Loadings and Hydrodynamic Forces on Counterrotating Propellers. (2002)
Tsakonas,S., Jacobs,W., Ali,M.
The linearized lifting surface theory has been applied to the evaluation of blade loadings and resultant hydrodynamic forces and moments (thrust, torque, bearing forces and bending moments) of...
Added Mass and Damping of the Heaving Surface Effect Ship in Uniform Translation. (2002)
The analysis presents a practical method for evaluating the added mass and damping coefficients of a heaving surface effect ship in uniform translation. The theoretical added mass and damping...
Blade Pressure Distribution for a Moderately Loaded Propeller. (2002)
Tsakonas,S., Breslin,John P., Jacobs,W. R.
A new theoretical procedure has been developed modifying the existing analysis for a marine propeller operating in a nonuniform inflow field by considering the radially varying mean wake and mean...
A Theoretical Procedure for Calculating Propeller-Induced Hull Forces. (2002)
Tsakonas,S., Valentine,Daniel T.
A method based on rational mechanics is presented for predicting hydrodynamic forces and moments on a hull of arbitrary geometry as a reaction to the propeller-induced velocity field. This method...
The Linearized Unsteady Lifting Surface Theory Applied to the Pump-Jet Propulsive System. (2002)
Jacobs,W. R., Tsakonas,S., Liao,Ping
A theoretical analysis is developed treating the 'Pump-Jet' propulsive unit comprised of stator, rotor and enshrouding nozzle by using the unsteady lifting surface theory. The analysis takes into...
Tsakonas,S., Breslin,J. P., Teeters,J.
A method has been developed to calculate the blade frequency point pressure on a hull surface in the presence of a propeller and a free water surface. The approach is based on that previously...
A THEORY FOR THE PROPELLER-RUDDER INTERACTION. (1998)
Tsakonas,S., Jacobs,W. R., Ali,M. R.
The propeller-rudder interaction problem is studied by means of the unsteady lifting-surface theory. Both surfaces of arbitrary geometry are immersed in a nonuniform flowfield (i.e., hull wake) of an...
Theory and Measurements of the Propeller-Induced Vibratory Field. (1998)
Jacobs,W. R., Mercier,J., Tsakonas,S.
A theory has been developed, based on lifting surface theory, for evaluation of the pressure field generated by an operating propeller in a non-uniform inflow field. In addition, an experimental...
Lifting Surface Theory and Hydroelastic Instability. (1998)
Tsakonas,S., Jacobs,W. R., Ali,M. R.
A brief review is presented of the unsteady lifting surface theory and of the 'generalized lift operator' technique of inverting the 'downwash' integral equation. The integral equation approach is...