Download or read book The BARBEY Report An Investigation Into Controllable Pitch Propeller Failures from the Standpoint of Full Scale Underway Propeller Measurements written by C. Noonan and published by . This book was released on 1977 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report reviews the previous experience with Controllable Pitch Propellers (CPP). Two ships of the FF-1052 class were fitted out with CPP's for test and evaluation. One of these ships, the USS BARBEY (FF-1088), experienced difficulties followed by catastrophic failure of the CPP mechanism after a relatively short period of operation. As part of an extensive investigation into the general CPP design philosophy with particular reference to the failures experienced on BARBEY, the David W. Taylor Naval Ship Research and Development Center (DTNSRDC) instrumented the CPP mechanism on BARBEY and conducted full-scale drydock, dockside, and underway tests. The results showed that the quantitative and qualitative assumptions made in the structural design and propeller blade loads (especially during maneuvers) were not compatible with reality. More explicitly, the propeller blade palm acts as a nonuniform, nonlinear loading mechanism on the blade bolts. It was found that this mechanism causes excessive loads which lead to fatigue damage in the bolts and crank disk. This was most likely the direct cause of the original bolt failures and, together with geometric design and metallurgical deficiencies, contributed significantly to the crank disk failures.
Download or read book Propellers 81 written by and published by . This book was released on 1981 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book MRIS Abstracts written by Maritime Research Information Service and published by . This book was released on 1978 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Naval Engineers Journal written by and published by . This book was released on 1978 with total page 762 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Summary Report of the Controllable Pitch Propeller Research Program written by and published by . This book was released on 1982 with total page 491 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is a summary of the controllable pitch (CP) propeller blade attachment investigations which were conducted by the David W. Taylor Naval Ship Research and Development Center subsequent to the failure of the CP propeller on the USS BARBEY (FF-1088). Analysis of the BARBEY failures revealed that there was insufficient information available concerning design loads, structural response, and material selection for CP propeller hub components.
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1978 with total page 1388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Unsteady and Mean Loads on a CP Propeller Blade on a Model of the FF 1088 for Simulated Modes of Operation written by Robert J. Boswell and published by . This book was released on 1976 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments are described in which the mean and unsteady loads were measured on a single blade of a model of the controllable-pitch propeller on the FF-1088. The experiments were conducted behind a model of the FF-1088 hull under steady ahead operation, hull pitching motions, simulated crash ahead maneuvers, and simulated crash astern maneuvers. The experimental techniques are outlined and the dynamometer and data analysis system described. The results show that the circumferential variation of all measured components of blade loading is primarily a once-per-revolution variation, with maximum and minimum values occurring near the angular positions in which the spindle axis is horizontal. For sinusoidal pitching of the model hull with amplitude of 2 deg and frequency of 0.8 Hz, the peak-to-peak circumferential variation of measured forces and moments increased by a minimum of 50 percent over the values without hull pitching. For simulated operation during a crash ahead or crash astern maneuver, the circumferential variation of measured forces and moments varied approximately as the product of ship speed and propeller rotational speed, and was a function of propeller pitch. At no time during the simulated crash ahead or crash astern maneuvers were the circumferential variations of loads as large as during steady ahead operation. For steady ahead operation, circumferential variation of loading determined from the model experiments agreed fairly well with full-scale data, but was substantially larger than the theoretically calculated values. (Author).
Download or read book Government Reports Annual Index written by and published by . This book was released on 1978 with total page 1610 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Download or read book Failure and Safety Analysis of Controllable pitch Propellers for the U S S B a r b e y DE1088 and U S S S p r u a n c e DD963 written by Justin Elliot Kerwin and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Validity of Full scale Propeller Braking Tests in the RAE 24 ft Wind tunnel written by Aeronautical Research Council and published by . This book was released on 1952 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Further Measurements of Model Propeller Pressure Distributions Using a Novel Technique written by Stuart D. Jessup and published by . This book was released on 1986 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Model propeller blade pressure distributions were measured using a novel technique. A single pressure gage was installed at a radial position to measure pressures at numerous chordwise locations through pressure taps and connecting channels. The technique resulted in accurate, detailed pressure distributions along two radial positions using two pressure gages. The major advantage of this technique is the ability to make measurements in the thin parts of the blade with high potential accuracy, and no disruption to the measuring surface, except for the orifice hole. The relatively along test time required to collect the data is the disadvantage. Keywords: Marine Propeller, Propeller Research Pressure Distribution, Model Experiments.
Download or read book LST 1156 Class Controllable Pitch Propeller written by United States. Navy Department. Bureau of Ships and published by . This book was released on 1962 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Noise and Performance of Propellers for Light Aircraft written by and published by . This book was released on 1980 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction and Summary: The project "Noise and Performance of Propellers for Light Aircraft," Contract #NASl-15154 between NASA Langley and MIT, has now been completed, and the main results obtained are summarized in this report and its appendices. The primary practical objective of the study was to explore the possibility of reducing the noise from a general aviation type propeller without altering significantly its aerodynamic performance or the engine characteristics. After an extensive study of this question, involving aerodynamic and acoustic theory, design, construction and wind tunnel testing of model propellers, design and manufacturing of full scale propellers and, finally, flight tests, we are pleased to report that for one of the propellers tested an overall reduction of 4.8 dBA as measured in a flight test was achieved. The theory deals with aerodynamics and acoustics of lightly loaded propellers with subsonic tip speeds and includes studies of the effects of sweeping the blades, altering the radial load distribution, and changing the number of blades. These studies lead to new insight into the general problem of sound generation from moving bodies. Of particular value are the algorithms, which are well suited for computer coding. The wind tunnel tests involved three propellers, 1/4 scale, including a replica of a fixed pitch propeller used on a 150 HP single engine airplane. The other two propellers were designed to have the peak radial load distribution shifted inboard. The acoustic wind tunnel which was used in these tests enabled measurement not only of the radiated sound field but also the thrust and torque of the propeller. In addition, the load distribution was determined indirectly from wake surveys. Sound pressure signatures were obtained at different locations and speeds (up to a tip Mach number of 0.75) and compared with theoretical predictions in which only the shape and motion of the propeller were needed as input parameters; no empirical adjustments were made. Agreement to within a few percent was obtained throughout except in the presence of a transonic "buzz" instability which was encountered within a narrow speed range. On the basis of the theoretical analysis and its verification in the model tests, a two-bladed fixed pitch propeller was designed for a 150 HP single engine airplane. Flight tests with this propeller indicated about the same performance as the production propeller for that airplane, but the maximum sound level during a full power flyover at 1000 feet was found to be 4.8 dBA lower. A second propeller, with three blades and fixed pitch, was designed for the Ohio State University 180 HP single engine airplane. Flight tests of this propeller have not yet been made at this time.
Download or read book Failure of the Controllable Pitch Propeller of the Chemical Tanker Key Bora Resulting in Heavy Contact with the Jetty in the Port of Hull written by Marine Accident Investigation Branch and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tests of Five Full scale Propellers in the Presence of a Radial and a Liquid cooled Engine Nacelle written by David Biermann and published by . This book was released on 1938 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Static Stresses on Wide bladed Propellers written by Justin H. McCarthy and published by . This book was released on 1970 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Download or read book Report on the Investigation of the Failure of the Controllable Pitch Propeller of the Cargo Ship Saffier Resulting in Heavy Contact with a Berthed Tug in Immingham Harbour 25 June 2011 written by Great Britain. Marine Accident Investigation Branch and published by . This book was released on 2012 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
