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Keywords: vibration
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Proceedings Papers

Paper presented at the SNAME Propeller and Shafting Symposium, September 12–13, 2023
Paper Number: SNAME-PSS-2023-010
... influential due to supra-regional laws.The primary structure-borne sound path is transmitted from the engine over the engine mounts into the ship's hull. This obvious path is currently already well attenuated and for the most part does not present noise vibration problems. Therefore, the secondary path from...
Proceedings Papers

Paper presented at the SNAME 14th Propeller and Shafting Symposium, September 15–16, 2015
Paper Number: SNAME-PSS-2015-002
... Since 1869 the main goal of whirling vibration calculations of rotating machinery was to determine critical speeds. Currently, all Classification Societies require a propulsion shafting whirling vibration calculation (also named bending or lateral vibration calculation) in the scope...
Proceedings Papers

Paper presented at the SNAME 13th Propeller and Shafting Symposium, September 11–12, 2012
Paper Number: SNAME-PSS-2012-001
... dynamic propulsion shaft measurements on board of the RoPax vessel Pride of France in order to solve high shaft support bearing operational temperatures. After modeling the propulsion line with a state-of-the-art CAE software for shaft alignment and vibration calculations and recording of the actual...
Proceedings Papers

Paper presented at the SNAME 12th Propeller and Shafting Symposium, September 15–16, 2009
Paper Number: SNAME-PSS-2009-11
..., the third is a substantial disparity between modern knowledge in propulsion train domain and capabilities of software in use. The above-stated reasons provided a starting point for the development of the presented Computer Aided Engineering (CAE) system. application model vibration calculation...
Proceedings Papers

Paper presented at the SNAME 11th Propeller and Shafting Symposium, September 12–13, 2006
Paper Number: SNAME-PSS-2006-12
... propulsion plants, such as discussed in this paper, saved costs are basically related to the choice of torsional vibration damper size and more slender shafts resulting in simpler shaft alignment and less bearing problems. Shaft design examples based on the Del Norske Veritas methodology and essential...
Proceedings Papers

Paper presented at the SNAME 11th Propeller and Shafting Symposium, September 12–13, 2006
Paper Number: SNAME-PSS-2006-03
... propeller vibration marine transportation single propeller case2 hull pressure fluctuation propeller angle shift Prediction of Hull Pressure Fluctuations Induced by Single and Twin Propellers Yoonsik Hwang1 (AM), Hong Sun2 (SM), Spyros A. Kinnas3 (M), I Daewoo Shipbuilding and Marine Engineering...
Proceedings Papers

Paper presented at the SNAME 9th Propeller and Shafting Symposium, September 20–21, 2000
Paper Number: SNAME-PSS-2000-06
... viscosity deflection shaft bearing hollow shaft stem bearing unit length leakage stiffness marine transportation clearance diameter coefficient propeller vibration upstream oil & gas ship lubricated bearing consideration solid shaft equation STERN BEARINGS, BACKGROUND...
Proceedings Papers

Paper presented at the SNAME 9th Propeller and Shafting Symposium, September 20–21, 2000
Paper Number: SNAME-PSS-2000-15
... This paper describes the determination of the oscillatory loads generated by a propeller operating in an irregular wakefield. The vibrations caused by these loads can damage the shaft and its bearings or cause undesirable noise. The method used in this determination is the two-dimensional...
Proceedings Papers

Paper presented at the SNAME 9th Propeller and Shafting Symposium, September 20–21, 2000
Paper Number: SNAME-PSS-2000-19
... requirement frequency component rms calculation propulsion system peak value us government ship thrust bearing torque propeller vibration criteria thrust bearing engine shaft magnitude THE DEVELOPMENT OF A NEW STANDARD FOR THE VIBRATION OF SHIP PROPULSION SYSTEMS 1Gary P. Antonides1...
Proceedings Papers

Paper presented at the SNAME 8th Propeller and Shafting Symposium, September 23–24, 1997
Paper Number: SNAME-PSS-1997-27
... hydrofoil cavitation number cavitation unsteady cavitation cavity length upstream perturbation propeller blade cavitation formula lift oscillation joum cavity vibration scale effect oscillation cavity surface amromin equation Two parameters can be fixed during...
Proceedings Papers

Paper presented at the SNAME 7th Propeller and Shafting Symposium, September 20–21, 1994
Paper Number: SNAME-PSS-1994-005
... This paper is presented as a precursor of a SNAME, M20 Ship Machinery Vibration Guideline for predicting the lateral shaft vibration amplitudes and forces on single and multiple screw ships. Comments from the attendees of the Symposium are sought to take this as useful as possible...
Proceedings Papers

Paper presented at the SNAME 6th Propeller and Shafting Symposium, September 17–18, 1991
Paper Number: SNAME-PSS-1991-18
... During builder's trials held in late 1989, the USCGC KANKAKEE, the first of two river buoy tenders constructed for the U.S. Coast Guard, experienced severe vibration and noise levels in the hull girder and deckhouse at design speed, even though the vibratory behavior of the main propulsion...
Proceedings Papers

Paper presented at the SNAME 6th Propeller and Shafting Symposium, September 17–18, 1991
Paper Number: SNAME-PSS-1991-17
... position are given. Longitudinal, lateral, torsional vibration problems and their influence on shafting design are discussed. A new method for the propeller shaft diameter calculation, useful when the bearing forces versus the angular position of the shaft are available, is presented. ship shafting...
Proceedings Papers

Paper presented at the SNAME Propellers '88 Symposium, September 20–21, 1988
Paper Number: SNAME-PSS-1988-04
.... Propeller cavitation is an important cause of vibration and noise in the afterbody of present day ships. The highly skewed propeller investigated in the present day ships. The highly skewed propeller investigated in the present study was predicted to have better cavitation characteristics than...
Proceedings Papers

Paper presented at the SNAME Propellers '88 Symposium, September 20–21, 1988
Paper Number: SNAME-PSS-1988-20
... Shaft alignment and vibration calculations must account for the inertial, flexibility and damping Proper ties of the couplings used to connect components in the propulsion train. After a brief description of the most common mechanical fluid and electric couplings, the paper outlines the basic...
Proceedings Papers

Paper presented at the SNAME Propellers '84 Symposium, May 15–16, 1984
Paper Number: SNAME-PSS-1984-11
... scaling. During these years great experience has been achieved also by full scale measurements and correlation studies. Different procedures to reduce the pressure pulses and thus the corresponding vibration has been investigated. These measures include improvement of hull shape, applications...
Proceedings Papers

Paper presented at the SNAME Propellers '84 Symposium, May 15–16, 1984
Paper Number: SNAME-PSS-1984-10
.... 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...
Proceedings Papers

Paper presented at the SNAME Propellers '81 Symposium, May 26–27, 1981
Paper Number: SNAME-PSS-1981-010
.... These comparisons also point out limitations in the accuracies of the existing models. Results are presented of measurements of cavity volume velocities made by calibrating the ship vibration by using the principle of reciprocity. The accuracy of this reciprocal technique is demonstrated by a comparison...
Proceedings Papers

Paper presented at the SNAME Propellers '81 Symposium, May 26–27, 1981
Paper Number: SNAME-PSS-1981-015
... The prediction of axial, torsional and transverse shaft vibrations of propulsion shafts in the design stage requires accurate knowledge of the hydrodynamic coefficients that describe the propeller contribution to the inertial, damping and coupling effects in the entire system. The objective...
Proceedings Papers

Paper presented at the SNAME Propellers '81 Symposium, May 26–27, 1981
Paper Number: SNAME-PSS-1981-005
... The Wartsila Shipyards are building seven Baltic ferries between, 1979 and 1981, four of them are prototypes. The Turku Shipyards are building six of these ferries. Some of the main design criteria are high propulsive efficiency at various sailing conditions, low vibration and noise level...

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