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Effect of model-structural dynamics on propeller-induced hull pressure measurements
Citation Link: https://doi.org/10.15480/882.9353
Publikationstyp
Conference Paper
Date Issued
2024-04-04
Sprache
English
Author(s)
Memorial University of Newfoundland, St. John’s, Canada
Memorial University of Newfoundland, St. John’s, Canada
Memorial University of Newfoundland, St. John’s, Canada
Memorial University of Newfoundland, St. John’s, Canada
National Research Council of Canada (NRC), St. John’s, Canada
TORE-DOI
Start Page
497
End Page
505
Citation
8th International Symposium on Marine Propulsors (smp 2024)
Contribution to Conference
Publisher
Norwegian University of Science and Technology, Department of Marine Technology
ISBN
978-82-691120-5-4
Peer Reviewed
true
Propellers are important sources of ship vibrations. Experimental model tests in tow-tank facilities are established methods to assess the design of propellers and ship hulls. However, during these tests, the ship model structural dynamics may affect the results when measuring the propeller-induced hull pressure pulses.
This paper presents the results of towing tests on a scaled model of a bulk carrier at the atmospheric towing tank at NRC-OCRE combined with Operational Deflection Shape Analysis (ODS) of the model’s structures. The model was equipped with a four-blade fixed-pitch propeller. Twelve pressure sensors and two sets of eight accelerometers measured propeller-induced pressures and vibrations during the tests. Further, an Experimental Modal Analysis (EMA) identified the model’s natural frequencies and mode shapes. The towing tests were performed at different model hull speeds (Vm) and propeller speeds. The signals acquired were post-processed in MATLAB® to find the pressure amplitudes, perform an ODS, assess the structural dynamics, and check possible resonances.
The results indicate that although the local plating does not resonate with the exciting pressure pulsations, the model structure has global modes in the frequency range of interest.
This paper presents the results of towing tests on a scaled model of a bulk carrier at the atmospheric towing tank at NRC-OCRE combined with Operational Deflection Shape Analysis (ODS) of the model’s structures. The model was equipped with a four-blade fixed-pitch propeller. Twelve pressure sensors and two sets of eight accelerometers measured propeller-induced pressures and vibrations during the tests. Further, an Experimental Modal Analysis (EMA) identified the model’s natural frequencies and mode shapes. The towing tests were performed at different model hull speeds (Vm) and propeller speeds. The signals acquired were post-processed in MATLAB® to find the pressure amplitudes, perform an ODS, assess the structural dynamics, and check possible resonances.
The results indicate that although the local plating does not resonate with the exciting pressure pulsations, the model structure has global modes in the frequency range of interest.
Subjects
Propeller-induced hull pressures
scaled model
tow tank tests
experimental modal analysis
operational deflection shape analysis
DDC Class
620: Engineering
Publication version
publishedVersion
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Name
Jahanbakhsh-EffectOfModelstructuralDynamicsOnPropellerinducedHullPressureMea-1175-1-final.pdf
Type
Main Article
Size
1.32 MB
Format
Adobe PDF