Electromagnetic active control device for longitudinal vibration of marine shafting

Abstract

An electromagnetic active control device for longitudinal vibration of a marine shafting, belonging to the technical field of oceanographic engineering, comprises: an acceleration transducer, a tachometer, a signal analysis and control module, a power amplifier and an electromagnetic actuator, wherein the acceleration transducer and the tachometer are respectively located on a thrust bearing base and a middle shaft and output a measured vibration acceleration electric signal of the base and a photoelectric signal of the shafting to the signal analysis and control module; the signal analysis and control module receives the vibration acceleration electric signal and the photoelectric signal, performs spectrum analysis and characteristic signal extraction on the received signals to generate corresponding action control signals, and outputs the action control signals to the power amplifier for amplification; and the electromagnetic actuator is arranged on the middle shaft and receives the amplified control signals to generate a corresponding longitudinal actuation force applied on the middle shaft, thereby implementing the control for the longitudinal vibration of the shafting. The electromagnetic active control device for longitudinal vibration of the marine shafting effectively reduces the longitudinal vibration of the shafting, so that vibration response of a marine structure is reduced finally, and the control device not only is effective to low frequency line spectra, but also has excellent control effect on broadband random excitation.

Description

technical field [0001] The invention relates to a device in the technical field of marine engineering, in particular to an electromagnetic active control device for longitudinal vibration of a ship shafting system. Background technique [0002] When the propeller of a ship moves in the uneven wake field at the stern, it will generate narrow-band periodic and broadband random excitation forces. to the bearing base and cause the hull to vibrate. Especially the latter, when the ship sails at low speed, it often causes the hull vibration to exceed the standard, which will seriously reduce the comfort of personnel and even cause damage to the hull structure. Therefore, how to effectively control and slow down the shafting and hull vibration caused by the propeller excitation force is a matter of great concern to ship designers. [0003] Starting from the basic principles of vibration control, there are usually three ways to control the vibration of the shafting and hull caused ...

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Problems solved by technology

Among them, the damper only has an obvious effect on the resonance peak, and the overall effect is relatively limited; for example, Cao Yipeng, Zhang Wenping, using dynamic vibration absorbers to reduce the radiation noise of underwater structures caused by the longitudinal vibration of the shaft system, Journal of Harbin Engineering University, 2008, v28, p747-754, and Liu Yaozong, Wang Ning, etc., Research on Axial Vibration Reduction of Submarine Propulsion Shafting Based on Dynamic Vibration Absorber, Vibration and Shock, 2009, V28, p184-188 The shafting dynamic Or dual-frequency excitation is effective, but it cannot adapt to multi-frequency excitation or when the speed changes; further search found, A.J.H.Goodwin, "The design of a resonance changer to overcome excessive axial vibration of propeller shafting", Institute of Marine Engineers-Transactions 1960, V72, p37-63 [A.J.H.Goodwin, Journal of the Institute of Ocean Engineering, Resonant Transformer Design for

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