A Study on the Measurement and Analysis of Whirling Vibration Behavior of Marine Propulsion Shafting System using Gap-sensors
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Recently, as a result of the application of large and multi-blade propellers with high efficiency for large vessels, thevertical bending stiffness of propulsion shafting system tends to be declined. For some specific vessels, the shaft arrangement leadsto the forward stern tube bearing to be omitted, decreasing vertical bending stiffness. In this respect, decreased vertical bendingstiffness causes the problem which is the blade order resonance frequency to be placed within the operational rpm range ofpropulsion shafting system. To verify whirling vibration, the measurement should be carried out covering from operating rpm up totarget rpm, however, the range is un-measurable generally. In order to resolve the measurement issue, this study shows the measuringmethod and the assessment method of relevant natural frequency of whiling vibration by using measured harmonic order componentof whirling vibration.
Abstract
Recently, as a result of the application of large and multi-blade propellers with high efficiency for large vessels, thevertical bending stiffness of propulsion shafting system tends to be declined. For some specific vessels, the shaft arrangement leadsto the forward stern tube bearing to be omitted, decreasing vertical bending stiffness. In this respect, decreased vertical bendingstiffness causes the problem which is the blade order resonance frequency to be placed within the operational rpm range ofpropulsion shafting system. To verify whirling vibration, the measurement should be carried out covering from operating rpm up totarget rpm, however, the range is un-measurable generally. In order to resolve the measurement issue, this study shows the measuringmethod and the assessment method of relevant natural frequency of whiling vibration by using measured harmonic order componentof whirling vibration.
참고문헌 (5)
- E. Panagopulos, "Design-Stage Calculations of Torsional, Axial and Lateral Vibrations of Marine Shafting", Transactions of Society of Naval Architects and Marine Engineers, 58, pp.329~384 (1950)
- A Theoretical Approach to the Problem of Critical Whirling Speeds of Shaft-Disk Systems, "N. H. Jasper", DTMB, ~, pp.DTMB Report 890 (1954)
- A Design Approach to the Problem of Critical Whirling Speeds of Shaft-Disk Systems, "N. H. Jasper", DTMB, ~, pp.DTMB Report 890 (1954)
- Whirling Vibration Problem for Propulsion Shafting System, Korea Ship Safety Technology Authority Report, "H. J. Jeon", Korea Maritime & Ocean University, ~ (2001)
- H. J. Jeon, "Ship Propulsion Transmission Equipment" (1986), Taehwa Publishing Company