Vibration damper for ship shaft system and vibration damping method of vibration damper

Abstract

The invention discloses a vibration damper for a ship shaft system. The vibration damper comprises a shaft and a cabin wall for supporting the shaft, two shaft sleeves, two bearings, one barrel-shaped base body and a vibration damping cover which are subject to axial isolation are sequentially and fixedly installed between the shaft and the cabin wall in a sleeving manner from the outer circle of the shaft outwards, the vibration damping cover and the base body are in sealed connection to form a sealed annular cavity body, the cross section of the annular cavity body is in an arc taper shape, and a flange is arranged at the top of the arc taper; a ring-shaped vibration damping sheet provided with a plurality of through holes and extending into the annular cavity body is fixedly embedded at one end of the flange, and the other end of the flange is fixedly connected with the cabin wall; and an oil adding valve and a gas discharging valve which are communicated with the annular cavity body are arranged on a cover face of the vibration damping cover, and vibration damping oil is refueled into the annular cavity body. By means of the vibration damper, through combination of the vibration damping sheet and a perforated plate, vibration damping is achieved through damping of the vibration damping oil, the structure is simple, dismounting and mounting are convenient, different vibration working stations can be met by replacing the vibration damping sheet, and the service life is long.

Description

technical field [0001] The invention relates to a vibration damping device for ship shafting, in particular to a vibration damping base for ship shafting pulsation and a vibration damping method thereof, belonging to the technical field of ship shafting vibration reduction. Background technique [0002] Ship shafting vibration is one of the main sources of ship noise excitation, and excessive shafting vibration is one of the main reasons for shortening the life of ship power equipment. In the process of mechanical transmission, ship shafting is an important part of mechanical equipment. The engine of the ship will produce vibrations of different frequencies at different speeds, and the vibration will be transmitted to the hull structure through the shafting. Because the traditional shafting vibration reduction frequency band is narrow, it cannot effectively absorb vibration energy. Vibration has a great impact on the safety of ship equipment. The low-frequency vibration can...

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Problems solved by technology

However, the device must vibrate at a medium to high frequency, so that the positive pressure on the contact surface of the wire mesh reaches a certain amount, so that the sliding phenomenon of the wire mesh block can occur, and the frictional damping can consume vibration energy.

If the front pressure is not enough, the wire mesh will only produce static friction, and the slip phenomenon will not occur, and the device will have no vibration damping effect

And the device cannot replace parts to adapt to different vibration damping conditions

Therefore, the vibration damping device of this patent has low sensitivity and weak ability to adapt to different working conditions. It can only absorb medium and high frequency vibration frequencies, but has no effect on low frequency vibrations. A large part of the space is not well utilized, occupying the limited space in the engine compartment

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