A vibration damping device and vibration damping method for ship shafting

Abstract

The invention discloses a vibration damping device for a ship's shaft system, which includes a shaft and a bulkhead supporting the shaft, and two axially isolated shaft sleeves are fixedly fitted between the shaft and the bulkhead in sequence from the outer circle of the shaft to the outside. , 2 bearings, a cylindrical base body and a vibration damping cover, wherein the vibration damping cover is sealed and connected with the base body to form a sealed annular cavity body, and the cross section of the annular cavity body is The arc-shaped cone is provided with a flange at the top of the arc-shaped cone, and one end of the flange is fixed with a ring-shaped damping sheet with a number of through holes and extending into the annular cavity, and the other end It is fixedly connected with the bulkhead; the cover surface of the damping cover is provided with a refueling valve and an air release valve communicating with the annular cavity, and the annular cavity is filled with damping oil . The invention utilizes the combination of the damping sheet and the porous plate to achieve vibration reduction through the damping of the damping oil, has a simple structure, is convenient to disassemble, is suitable for different vibration working conditions by replacing the vibration damping sheet, and has a long service life.

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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