Static Stress Measurements on a Series of Skewed Propeller Blades with and Without Forward Rake PDF Download
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Author: Robert J. Boswell
Publisher:
ISBN:
Category : Propellers
Languages : en
Pages : 82
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Book Description
Static strains were measured in a systematic series of five marine propeller blades. The propeller blades have projected skew angle at the blade tip equal to zero, 36 degrees and 72 degrees without rake, and 36 and 72 degrees with sufficient forward rake to place the locus of the section midchord in the propeller plane. This combination of skew and rake is called warp. The primary experiments were conducted with the blades under uniform loading applied with air pressure using specially constructed chambers. Limited supplemental experiments were conducted using concentrated loads. The experimental results under uniform loading were correlated with modified beam theory. Both the experimental results and the modified beam theory indicate that for all the skewed and warped propeller blades evaluated, the largest value of the maximum principal stress is no greater than 1.20 times the maximum prinicipal stress on the unskewed propeller.
Author: Robert J. Boswell
Publisher:
ISBN:
Category : Propellers
Languages : en
Pages : 82
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Book Description
Static strains were measured in a systematic series of five marine propeller blades. The propeller blades have projected skew angle at the blade tip equal to zero, 36 degrees and 72 degrees without rake, and 36 and 72 degrees with sufficient forward rake to place the locus of the section midchord in the propeller plane. This combination of skew and rake is called warp. The primary experiments were conducted with the blades under uniform loading applied with air pressure using specially constructed chambers. Limited supplemental experiments were conducted using concentrated loads. The experimental results under uniform loading were correlated with modified beam theory. Both the experimental results and the modified beam theory indicate that for all the skewed and warped propeller blades evaluated, the largest value of the maximum principal stress is no greater than 1.20 times the maximum prinicipal stress on the unskewed propeller.
Author: Robert J. Boswell
Publisher:
ISBN:
Category :
Languages : en
Pages : 15
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Book Description
Static stresses were measured in a highly skewed marine propeller blade using a specially constructed pressure chamber which allowed the blade to be loaded under air pressure. The measured stress distribution was radically different from those previously measured on unskewed blades. The highest stresses occurred in a relatively narrow band extending from near the trailing edge at the blade root to near the leading edge at 90-percent radius. For a uniform pressure loading of 1.0 psi, the maximum measured principal stress was 2200 psi in compression and 1800 psi in tension. The maximum radial stress calculated by beam theory for the equivalent unskewed propeller was 910 psi both in tension and compression. (Author).
Author: Edward V. Lewis
Publisher: Society of Naval Architects & Marine Engineers
ISBN:
Category : Science
Languages : en
Pages : 344
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Book Description
Author: Maritime Research Information Service
Publisher:
ISBN:
Category :
Languages : en
Pages : 568
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Book Description
Author: Society of Naval Architects and Marine Engineers (U.S.)
Publisher:
ISBN:
Category : Marine engineering
Languages : en
Pages : 722
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Book Description
List of members in vols. 1-24, 38-54, 57.
Author: Justin H. McCarthy
Publisher:
ISBN:
Category : Propellers
Languages : en
Pages : 52
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Book Description
Static stresses were obtained in laboratory experiments for a destroyer propeller, having aerofoil blade sections, and a super-cavitating propeller, having wedge-shaped blade sections, using specially constructed pressure chambers that allowed the blade faces to be loaded under air pressure. A new method for applying beam theory is presented that closely predicts the magnitude and distribution of radial stresses on the destroyer propeller blade. For the supercavitating propeller, neither the proposed beam-theory method nor a particular computerized-shell analysis can be considered entirely satisfactory for prediction of blade stresses. (Author).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 1196
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Book Description
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 804
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 970
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Anthony F. Molland
Publisher: Cambridge University Press
ISBN: 0521760526
Category : Science
Languages : en
Pages : 569
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Book Description
Written by experts in the ship design field, this book provides a comprehensive approach to evaluating ship resistance and propulsion.
