Download or read book Prediction of Propeller Induced Vibrations in a RoPax Ferry written by and published by . This book was released on 2000 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ship Vibration Prediction Methods and Evaluation of Influence of Hull Stiffness Variation on Vibratory Response written by Roger G. Kline and published by . This book was released on 1974 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research is conducted to obtain a greater understanding of induced hull vibrations and, more specifically, to define the role of hull stiffness in such phenomena. Available methods for the prediction of vibratory response to propeller, slam and wave excitations are evaluated. Calculations of the propeller, slam- and wave-induced vibrations of three ships are presented. The three ships are a 249,300 DWT tank ship, the Great Lakes ore carrier 'STR. EDWARD L. RYERSON' and the 544 ft. general cargo ship 'S. S. MICHIGAN.' Design trends are developed with respect to characteristics that influence ship stiffness and vibratory response. The work appears in 2 volumes.
Download or read book Prediction of Propeller induced Hull pressure Fluctuations written by Hendrik Cornelis Jacobus Wijngaarden and published by . This book was released on 2011 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technology and Science for the Ships of the Future written by A. Marinò and published by IOS Press. This book was released on 2018-06-22 with total page 1078 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1974, a scientific conference covering marine automation group and large vessels issues was organized under the patronage of the Technical Naval Studies Centre (CETENA) and the Italian National Research Council (CNR). A later collaboration with the Marine Technical Association (ATENA) led to the renaming of the conference as NAV, extending the topics covered to the technical field previously covered by ATENA national conferences. The NAV conference is now held every 3 years, and attracts specialists from all over the world. This book presents the proceedings of NAV 2018, held in Trieste, Italy, in June 2018. The book contains 70 scientific papers, 35 technical papers and 16 reviews, and subjects covered include: comfort on board; conceptual and practical ship design; deep sea mining and marine robotics; protection of the environment; renewable marine energy; design and engineering of offshore vessels; digitalization, unmanned vehicles and cyber security; yacht and pleasure craft design and inland waterway vessels. With its comprehensive coverage of scientific and technical maritime issues, the book will be of interest to all those involved in this important industry.
Download or read book Numerical Prediction of Propeller Induced Hull Pressure Pulses and Noise written by Muye Ge and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Propeller induced Vibration written by Kareem Al-Taiby and published by . This book was released on 2022 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Ship's propellers are main sources of onboard vibration that can have adverse effects on humans and machinery alike. A reliable design tool that allows the prediction of propeller induced vibration, in the early design phases of new constructions would help prevent damage or discomfort and reduce costs related to later modifications of the propellers. In an effort to obtain data on vibration generated by ship's propellers, tests can be performed on a ship model in a tow tank. Self-Propulsion, Resistance and Bollard tests are established tests used to characterize the ship's hydrodynamics in a tow tank. Recently some researchers are investigating the possibilities to help understand the how the propeller design affects the vibration and vibration propagation to the ship body. One of the main problems with these tests is the separation of vibrational contribution of the propeller versus the fundamental frequencies of the ship model. In this work, experimental model tests were performed to evaluate the pressure fluctuations created by the propeller on a vessels structure. Methods used to perform these tests included Experimental Modal Analysis and Operating Deflection Shape, the latter performed during the hydrodynamic tests. The results show how pressure measurements can be influenced by structural vibration and thus the importance of identifying ranges of vibrational effects from the ship models' structure during hydrodynamic testing to understand if structural vibrations need to be removed from the pressure sensor measurements to give an accurate representation of vibration effects due to the propeller.
Download or read book Numerical Prediction of Propeller Induced Hull Pressure Pulses written by and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography for the Study of Propeller induced Vibration in Hull Structural Elements written by O. H. Burnside and published by . This book was released on 1978 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: This bibliography is not meant to be an exhaustive bibliography of all references dealing with propeller-induced vibrations. Emphasis has been placed on the current generation of large, high-powered ships.
Download or read book Correlation of Theoretical Predictions of Propeller Induced Hull Pressures with Available Data written by S. Tsakonas and published by . This book was released on 1980 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 employed in calculating the propeller-induced hull forces in which the hull is represented by a source distribution smeared over the hull surface whose strength is determined through the solution of a Fredholm integral equation of the 2nd kind in terms of specified propeller-induced velocities. Point pressures are determined by superposing the free-space pressure emanating from the propeller through its fanning action on the pressure due to the diffraction potential. A series of calculations was performed for the case of a model tanker tested extensively at the Norwegian Experimental Tank (Ship and Ocean Labroatory, Norwegian Hydrodynamic Laboratories. The agreement between experimental and predicted values varies from point to point; in general, the maximum deviation of amplitude is between + or - 30%, but the phases are in poor agreement. A new method is suggested in which the hull is represented by a doublet distribution rather than a source distribution. This approach which reduces computing time considerably permits improved accuracy and results in much better correlation between experimental and calculated values.
Download or read book Prediction of Propeller Induced Hull Pressures by Means of a Medium size Cavitation Tunnel written by Allan Larsen and published by . This book was released on 1982 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Prediction of Underwater Noise Induced by Non cavitating cavitating Propellers written by Seungnam Kim and published by . This book was released on 2021 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work, a systematic procedure of analyzing marine propeller performance and its underwater acoustics is delineated. The main focus is laid on the numerical prediction of hull pressure fluctuations and far-field acoustics induced by marine propellers via frequency- or time-domain approaches. As the first step, a hydrodynamic boundary element method (BEM) is implemented to analyze the comprehensive marine propeller performance in open water and ship-behind conditions. An elaborate numerical scheme modeling developed tip vortex cavitation is proposed for cavitating propellers. In the frequency domain approach, a potential-based panel method (or pressure-BEM) solving for the diffraction potential on the ship hull is coupled with the hydrodynamic BEM to predict the propeller-induced hull pressure fluctuations. Infinite speed of sound is assumed in the near-field, neglecting the time travel of acoustic waves to reduce the Helmholtz equation to the Laplace equation, which can be solved by a standard BEM solver. Far-field underwater noise is investigated in the time domain using the Ffowcs Williams-Hawkings (FW-H) formulation. The model propeller is mounted on the ship with an infinite plane assumed at the design draft to consider the pressure release or solid wall boundary conditions. Time-dependent surface quantities from the hydrodynamic analysis are taken as the known noise sources to the FW-H equation given in the form proposed by Farassat. The complex hull geometry and its disturbance to the medium are considered by solving the boundary integral equations. A half-space domain is modeled by modifying standard full-space Green's function to consider the image model beyond the infinite plane. The propeller-induced noise, its reflections from the hull, and their sums as the total noise will be investigated in full-space or half-space domains. Numerical predictions, including the time history of acoustic pressures and noise spectra, under various operating conditions are compared with experimental measurements, observations, and results from finite volume methods to validate the feasibility and accuracy of the present method
Download or read book Proceedings of the symposium on propeller induced ship vibration written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Prediction of the Vortex induced Vibrations of Marine Riser written by and published by . This book was released on 2003 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Program to Minimize Propeller induced Vibration on Converted Maersk E Class Ships written by Jacques B. Hadler and published by . This book was released on 1984 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrodynamic Analysis of Propeller induced Vibration written by Albert Jefferson and published by . This book was released on 2007 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Publication written by and published by . This book was released on 1982 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Propeller Induced Ship Hull Vibration written by C. A. Carlsen and published by . This book was released on 1979 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
