A magneto-rheological elastomer thrust bearing base dynamic vibration absorber and its application method

Abstract

The invention relates to the technical field of marine power, in particular to a magnetorheological elastomer thrust bearing base dynamic vibration absorber and a use method. The dynamic vibration absorber is arranged on a thrust bearing base and comprises magnet yoke sets, a magnetism isolating support shaft, a magnetic conductive shaft sleeve, magnetorheological elastomers and an electromagnetic assembly. The outer layer of the magnetism isolating support shaft is sleeved with the magnetic conductive shaft sleeve. The two ends of the magnetic conductive shaft sleeve are provided with the parallelly arranged magnet yoke sets correspondingly. The joints of the magnetic conductive shaft sleeve and the magnet yoke sets are provided with the magnetorheological elastomers. At least one electromagnetic assembly is arranged around the part, between the two magnet yoke sets, of the magnetic conductive shaft sleeve. According to the magnetorheological elastomer thrust bearing base dynamic vibration absorber and the use method, longitudinal vibration of the thrust bearing base is controlled effectively, then the transmitting ratio of pulsating force of a propeller through the bearing base to a boat body is lowered, and the purpose of reducing of radiation noise is achieved.

Description

technical field [0001] The invention relates to the technical field of ship power, in particular to a magneto-rheological elastomer thrust bearing base dynamic vibration absorber and a use method thereof. Background technique [0002] The propeller is the most important driving mechanism of the ship, and its rotating motion generates static thrust, which pushes the ship to sail in the waters. At the same time, the rotating motion of the propeller will cause an irregular wake field at the stern of the ship, which also makes the propeller generate additional pulsating thrust. Among them, the static thrust is useful work, which drives the ship to sail. However, the pulsating thrust is useless and harmful. It causes the longitudinal tension and compression deformation of the propulsion shafting, causing longitudinal vibration. For surface ships, the vibration generated by the pulsating thrust will affect the ride comfort and cause harm to the equipment in the hull; for underwa...

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Problems solved by technology

However, the vibration absorber has problems such as uneven distribution of magnetic field, insufficient magnetic field strength, serious temperature rise, and unstable operation of the vibration absorber.

In addition, the shafting of the actual ship is relatively heavy. In order to ensure the effect of the vibration absorber, the overall mass of the vibration absorber will also be heavy, which will generate an additional bending moment on the shafting; the rotation of the vibration absorber with the shaft will easily introduce new unbalanced disturbance forces; The installation space is limited, and the introduction of concentrated loads will also have an adverse effect on the strength of the shafting

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