... carefully that the hydrodynamic loads can be measured reliably and accurately to a high frequency with high resolution. Attention has been paid to various operational conditions, covering ideal sailing ahead, DP & BP, SOLAS, thrusters-thruster interactions, and to those very extreme conditions e.g...

... features of 3-D cloud cavitation. enhanced recovery reservoir simulation upstream oil & gas frequency circulation vorticity tlv mesh coefficient cavitation number cavitating flow harwood influence cavitation rectangular hydrofoil gap cavitation ducoin gap flow vortex cavitating...

... Warfare Center, Carderock Division (NSWCCD). artificial intelligence marine transportation frequency element method propeller blade prediction blade deformation marine engineer proceedings nswccd hydroelastic response cavitation propeller 5479 kinna composite propeller naval architect...

.... Finally, a reasonable agreement was verified between the CFD calculation result and the sea trial results with the full-scale vessel. upstream oil & gas frequency blade surface revolution sea trial thickness beveled edge calculation back side chordwise direction sqcm propeller open...

... Torsional vibration analysis is a cheap, fast and efficient tool when it comes to evaluating the performance and safety of a propulsion plant. The present paper introduces the basic mathematical concepts of three different approaches to torsional vibration analysis: natural frequency analysis...

... several manufacturers were requested to famish any relevant data and their recommendations. A draft of this standard was distributed widely to industry and government to get comments and suggestions. This report explains the rationale behind the proposed criteria. us government frequency frequency...

... of analytical methods through the comparison of predictions with experimental measurements, and 5) developing improved component models and analytical methods. drillstring design drillstring dynamics frequency mass elastic data excitation engine order vibratory response torque approximate analysis...

... A general purpose finite element code is applied to estimate the stress, deflection, and fundamental natural frequency of a number of propellers with various loading distributions. Correlation with measured data is achieved with plate and brick elements and with quadrilateral and triangular...

... for the profession. marine transportation frequency ship sinh calculation information computer program excitation natural frequency prediction deflection procedure amplitude shaft propeller stiffness bearing cosh equation vibration critical speed THE SOCIETY OF NAVAL ARCHITECTS...

... systems was well within specifications. To determine the cause of this problem, an underway hull vibration survey was conducted, together with dockside impact tests and a 11spuddrop11 test. The cause of the problem was traced to the coincidence of the four-bladed propeller exciting frequency with the hull...

... consumption rubert gouge diver polishing roughness surface roughness company propeller maintenance propeller roughness program characteristic rubert gauge beach roug hness discovery frequency THE SOCIET6Y01OPPFaapeNVvriorAtgoninVbiiaeAaBpLreAeasAcvehneR.tenV,Cd,ugaHietntiI...

... a conventional propeller with no loss in propulsion efficiency. Therefore, the main goal of the experimental programme was to determine the acoustic source strength and frequency spectrum of the fluctuating volume of propeller cavitation. In addition, vibration levels in the stern of the vessel and sound...

.... Dynamic analysis results include: natural modes and frequencies of vibration and time history response. The problem of voluminous input data for the finite element method is bypassed, by using an automatic propeller- hub data generation method. Special features of the data generation method are its...

... harriette frequency accuracy propeller cavitation source strength propeller plane THE SOCIETY OF NAVAL ARCHITECTS AND MARINE ENGINEERS One World Trade Center, Suite 1369, New York, N.Y. 10048 Paper to be prasenllld at lha Propellers '81 Symslum, Vllgir.ta Beach, Virginia, May 26-27, 1981...

... are presented, self-propulsion, cavitation and pressure pulse measurements. Comparative measurements were performed with a convential and a so called highly skewed c.p. propeller model. Calculations of natural frequencies and modes and forced vibrations caused by propeller pressure pulses are presented...

... mass and damping of a Vibrating propeller. This program incorporates approximate lifting surface corrections. Results are presented to show the effects of advance coefficient, vibration frequency, blade number, and skew on propeller added mass and damping. Preliminary design equations are presented...

... vibrations and sixteen for coupled transverse vibrations. A brief description will first be given of the origin of these coefficients for a propeller vibrating in an unbounded fluid at a prescribed frequency. The paper will then show how the M.I.T. unsteady lifting surface theory computer program...

... ones. This wake distribution was compared with the nominal one. propeller calculation determination procedure frequency extrapolation ship din front naval architect world trade center suite 1369 plane separation dimension particle accuracy propeller plane THE SOCIETY OF NAVAL...

... expression variation unsteady thrust calculation amplitude evaluation polynomial comparison midchord skew null restriction reduction frequency representation application ~' THE SOCIETY"OF NAVAL ARCHITECTS AND MARINE ENGINEERS One World Trade Center, Suite 1369, New York, N.Y. 10048 Paper...

... of the cavity on each propeller blade. The cavitation volume can be calculated as function of the propeller geometry, propeller rpm and wake field. Provided the cavitation volume can be considered as being a monopole source the resulting source strength can be calculated as function of frequency. Based...