Download or read book Design and Construction of a System for Measurement of Unsteady Propeller Forces written by Charles Oliver Horton and published by . This book was released on 1970 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of a Procedure to Measure Unsteady Propeller Forces written by William Campbell Pfister and published by . This book was released on 1971 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Some Ship and Model Measurements of Unsteady Propeller Forces written by A. Silverleaf and published by . This book was released on 1966 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement Correlation with Theory and Parametric Investigation of Unsteady Propeller Forces and Moments written by Robert J. Boswell and published by . This book was released on with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Unsteady Propeller Bearing Forces written by Robert B. Zubaly and published by . This book was released on 1984 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Unsteady Propeller Loading Measurement Correlation With Theory and Parametric Study written by Robert J. Boswell and published by . This book was released on 1968 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Objectives of the present study are to measure the unsteady forces and moments on a series of marine propellers due to circumferentially nonuniform inflow; to correlate the measured unsteady thrust and torque with calculated values, based on various proposed theories; and to investigate variation of unsteady thrust and torque over a range of pertinent parameters, using the method determined from those described to be the best available for calculating unsteady loading. Experimental blade-frequency thrust and torque were compared with values calculated by the following techniques: quasi-steady, two-dimensional unsteady, combination quasi-steady two-dimensional unsteady, and three-dimensional unsteady. The three-dimensional unsteady theory yields the best correlation with experiment; however, the numerical techniques employed breakdown for narrow-bladed propellers and for propellers with blade overlap.
Download or read book Experimental Determination of Unsteady Forces on Contrarotating Propellers in Uniform Flow written by Marlin L. Miller and published by . This book was released on 1976 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurements of Propeller Induced Unsteady Surface Force and Pressures written by and published by . This book was released on 1986 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of an experimental investigation carried out in the 24-inch water tunnel are presented for the cavitating propeller-induced surface pressures and a reference-area surface force measured on a flat plate boundary representation of a nearby ship hull. Newly designed apparatus for the measurement of surface force on an instrumented disc is described in detail. It involves special dynamometry that can be used in a reverse mode so that the force disc can be driven as a mechanical shaker. A model of a seven-bladed propeller was run in a screen-generated simulation of the steep axial wake velocity distribution for a single screw ship. Results are displayed for the longitudinal and transverse distribution of the first three blade rate harmonic components of the unsteady pressure amplitudes and the unsteady disc force amplitudes at the blade tip clearances of 0.26 (diameter) and 0.41D, over a range of cavitation numbers. The unsteady pressure pulse amplitudes obtained in this work compare reasonably will with measured values obtained previously in a large water tunnel experiment using a complete scale model of the ship hull. The experimentally inferred blade rate harmonic component of cavity volume velocity from the reciprocity measurement agrees approximately with the prediction by the PUF-3 propeller anlaysis scheme. Keywords: Pressure amplitude; Surface force; Propeller excavitation; Reciprocity experiment; Cavity volume velocity; PUF (propeller-induced unsteady forces).
Download or read book Design and Development of Experimental Techniques for the Measurement of Unsteady Pressure on Propeller Blades with Polyvinylidene Fluoride Film written by Christopher John Sullivan and published by . This book was released on 1996 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The National union catalog 1968 1972 written by and published by . This book was released on 1973 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Twenty Second Symposium on Naval Hydrodynamics written by National Research Council and published by National Academies Press. This book was released on 2000-03-02 with total page 1039 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Twenty-Second Symposium on Naval Hydrodynamics was held in Washington, D.C., from August 9-14, 1998. It coincided with the 100th anniversary of the David Taylor Model Basin. This international symposium was organized jointly by the Office of Naval Research (Mechanics and Energy Conversion S&T Division), the National Research Council (Naval Studies Board), and the Naval Surface Warfare Center, Carderock Division (David Taylor Model Basin). This biennial symposium promotes the technical exchange of naval research developments of common interest to all the countries of the world. The forum encourages both formal and informal discussion of the presented papers, and the occasion provides an opportunity for direct communication between international peers.
Download or read book Unsteady Force Measurement Using Small Piezoelectric End Sensors written by Margalit Goldschmidt and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Most marine propellers operate in a nonuniform flow field. Understanding the unsteady lift generated on the propeller blades by these upstream wakes is important in order to reduce vibration and noise and therefore develop more efficient turbomachines. Currently, complex instrumentation involving unsteady dynamometry and pressure sensor arrays are utilized to characterize the unsteady pressures across propeller blades. New, simpler sensors have been designed to replace current instrumentation. These sensors take advantage of the oscillating nature of the unsteady lift, as at increasing inflow harmonics the rapidity of the unsteady lift fluctuations suggests that the lift nearly cancels out over the blade radius, and that the total unsteady force across a propeller blade can be found from parameters at the root and tip. These parameters were determined from an approximation provided by the Method of the Stationary Phase. Using this method, new sensors were designed and optimized to work universally. The newly designed sensors will be validated in a future experiment.
Download or read book Unsteady Propeller Forces Fundamental Hydrodynamics and Unconventional Propulsion written by Stanley W. Doroff and published by . This book was released on 1971 with total page 1669 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Optimization Method for the Reduction of Propeller Unsteady Forces written by Thomas S. Mauther and published by . This book was released on 1988 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on the work of Greenblatt (1978), an enhanced optimization technique for the reduction of propeller unsteady forces and the determination of skew distributions has been developed. The current method provides an efficient propeller design tool capable of determining a variety of cubic or quadratic skew distributions, subject to constraints, which minimize the unsteady forces produced by the various harmonic components of the input wake. The original skew optimization method was extended to include higher order harmonics, and the original force calculation method was replaced by an extended version of the method developed by Thompson (1976). Calculation of forces and skew distributions associated with a representative propeller show that acceptable reduction of unsteady forces can be obtained without having to place severe restrictions on the model constraints. The problem considered herein is the generation of propeller noise due to non-uniform inflow velocity fields. This has been still is an issue of research in the area of marine propellers, and it is felt that a recently developed method of calculating unsteady forces may also be applicable in the design and analysis of aircraft propellers. Angle-of-attack fluctuations result in unsteady blade loadings and the generation of propeller noise, and the noise sources are characterized by three types of unsteady force mechanisms: a) turbulence injection; b) vortex shedding; and c) blade-rate.
Download or read book Periodic Propeller Forces in Unsteady Flow written by Neal Alvin Brown and published by . This book was released on 1964 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book National Union Catalog written by and published by . This book was released on 1973 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes entries for maps and atlases.
Download or read book Unsteady Propeller Forces written by and published by . This book was released on 1971 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
