CN-116557466-B - Adjustable dynamic vibration absorber

CN116557466BCN 116557466 BCN116557466 BCN 116557466BCN-116557466-B

Abstract

The application discloses an adjustable dynamic vibration absorber, which comprises an adjustable dynamic vibration absorber, wherein an air damping structure is arranged in the adjustable dynamic vibration absorber, the air damping structure comprises a damping cylinder, a plurality of air damping holes are arranged at two ends of the damping cylinder, a damping adjusting sleeve is sleeved outside the damping cylinder, the damping adjusting sleeve can cover the air damping holes when moving on the damping cylinder, when the working condition or load of a main vibration system changes, the number of the air damping holes which can be ventilated is controlled by moving the damping adjusting sleeve so as to adjust the air damping of the dynamic vibration absorber, and the adjustable dynamic vibration absorber also comprises a mass structure with a multi-layer structure, wherein vibration absorbing particles are filled in each layer of cavity, so that friction and collision occur between the vibration absorbing particles to the greatest extent during vibration, thereby improving the vibration absorbing efficiency.

Inventors

YUAN PENG
ZHOU QINGHUA
LIU DASHUN

Assignees

江南造船(集团)有限责任公司

Dates

Publication Date: 20260512
Application Date: 20230620

Claims (9)

1. An adjustable dynamic vibration absorber is characterized by comprising a mass structure, an air damping structure and a base structure; The air damping structure is fixedly connected with the main vibration system through the base structure, the air damping structure comprises a damping adjusting sleeve and a damping cylinder, the damping cylinder is horizontally arranged, one end of the damping cylinder is fixedly connected with the base structure, one end of the damping cylinder is defined to be a first end, the other end of the damping cylinder is a second end, an end cover is hermetically arranged at the second end of the damping cylinder, a piston plate in sealed sliding fit with the inner wall of the damping cylinder is arranged in the damping cylinder, one side of the piston plate, far away from the main vibration system, is fixedly connected with one end of a piston rod, the other end of the piston rod is hermetically connected with the end cover through the end cover in a fixed manner, a spring is sleeved on the piston rod, one end of the spring is fixedly connected with the plate, the other end of the spring is fixedly arranged on the end cover, a plurality of air damping holes are formed in the cylinder wall of the damping cylinder, the damping cylinder is close to the air damping holes on the side of the first end, a piston plate is hermetically matched with the inner wall of the damping cylinder in a sliding manner, the piston plate is sleeved outside the damping cylinder is more than the damping adjusting sleeve, and the piston plate can be connected with the inner wall of the damping sleeve through threads of the damping sleeve when the piston plate moves; the mass structure is slidably mounted to the base structure along the piston rod axis.
2. The adjustable dynamic vibration absorber of claim 1, wherein the air damping structure further comprises a vibration isolation block, the vibration isolation block comprises a plate body and a cylindrical end arranged on one side of the plate body, the cylindrical end is inserted into the damping cylinder to be in close contact with the inner wall of the damping cylinder and fixedly connected with the damping cylinder, and the vibration isolation block is fixedly connected with the base structure through the plate body.
3. The adjustable dynamic vibration absorber according to claim 1, wherein the base structure is L-shaped, a vertical portion of the base structure is fixedly connected with the damping cylinder, a guide rail is fixedly provided on a horizontal portion of the base structure, and the mass structure is slidably connected with the guide rail.
4. The adjustable dynamic vibration absorber of claim 3, wherein the lower end of the mass structure is connected with the guide rail by a mortise and tenon structure.
5. The adjustable dynamic vibration absorber of claim 1, wherein the mass structure comprises a mass container filled with vibration absorbing particles.
6. The adjustable dynamic vibration absorber of claim 5, wherein the mass container has a multi-layer structure, and each layer of cavity is filled with the vibration absorbing particles.
7. The adjustable dynamic vibration absorber according to claim 6, wherein the mass container has a double-layer structure, a supporting plate is welded at the middle position of the inner walls of the left side and the right side of the mass container, a partition plate is placed on the supporting plate, the partition plate is fixedly connected with the supporting plate through a fastening bolt, and the partition plate is in seamless contact with the inner wall of the mass container.
8. The adjustable dynamic vibration absorber of claim 5, wherein the vibration absorbing particles are fine sand.
9. The adjustable dynamic vibration absorber of claim 5, wherein the filling rate of the vibration absorbing particles in the mass container is 50% -70%.

Description

Adjustable dynamic vibration absorber Technical Field The invention relates to the field of ship vibration absorption, in particular to an adjustable dynamic vibration absorber. Background Vibration phenomena occurring in ship structures or related equipment have been widely focused as a prominent problem, and the influence factors of such phenomena are numerous, such as wave loads received during sailing of a ship, operation of power machinery of the ship itself, auxiliary machinery, and the like. The machine frame of some large-sized main machines or compressors and other rotary mechanical equipment can generate obvious transverse vibration under the action of dumping moment, so that the machine frame is seriously damaged, and the bad influence which is difficult to measure is caused. At present, the method for controlling the transverse vibration on the ship mainly comprises the steps of installing a transverse support at a key part of equipment or a structure, but frequently generating the phenomenon of support fracture in actual use, so that the vibration is aggravated. In the prior art, the dynamic vibration absorber is also used for absorbing the vibration energy of the main vibration system, but the damping system of the traditional vibration absorber is a fixed value, and the damping coefficient cannot be adjusted when the working condition of equipment changes, so that the vibration absorbing effect of the traditional dynamic vibration absorber is not ideal. Disclosure of Invention Aiming at the defects in the prior art, the application provides an adjustable dynamic vibration absorber, which aims to solve the technical problem that the dynamic vibration absorber in the prior art is not ideal in vibration absorbing effect. In order to achieve the aim, the invention provides the following technical scheme that the adjustable dynamic vibration absorber comprises a mass structure, an air damping structure and a base structure; The air damping structure is fixedly connected with the main vibration system through the base structure, the air damping structure comprises a damping adjusting sleeve and a damping cylinder, the damping cylinder is horizontally arranged, one end of the damping cylinder is fixedly connected with the base structure, one end of the damping cylinder is defined to be a first end, the other end of the damping cylinder is a second end, an end cover is hermetically arranged at the second end of the damping cylinder, a piston plate in sealed sliding fit with the inner wall of the damping cylinder is arranged in the damping cylinder, one side of the piston plate, far away from the main vibration system, is fixedly connected with one end of a piston rod, the other end of the piston rod is hermetically connected with the end cover through the end cover in a fixed manner, a spring is sleeved on the piston rod, one end of the spring is fixedly connected with the plate, the other end of the spring is fixedly arranged on the end cover, a plurality of air damping holes are formed in the cylinder wall of the damping cylinder, the air damping holes close to the first end side of the damping cylinder are hermetically matched with the second end side of the damping cylinder, the piston plate is sleeved outside the damping cylinder, and the piston plate can cover the air damping holes close to the first end side of the damping cylinder when the piston adjusting sleeve moves; the mass structure is slidably mounted to the base structure along the piston rod axis. In one embodiment, the outer wall of the damping cylinder is provided with external threads, the inner wall of the damping adjustment sleeve is provided with internal threads, and the damping adjustment sleeve is in threaded connection with the damping cylinder. In one embodiment, the air damping structure further comprises a vibration isolation block, the vibration isolation block comprises a plate body and a cylindrical end arranged on one side of the plate body, the cylindrical end is inserted into the damping cylinder to be in close contact with the inner wall of the damping cylinder and fixedly connected with the damping cylinder, and the vibration isolation block is fixedly connected with the base structure through the plate body. In one embodiment, the base structure is in an L-shaped shape, the vertical part of the base structure is fixedly connected with the damping cylinder, a guide rail is fixedly arranged on the horizontal part of the base structure, and the mass structure is slidably connected with the guide rail. In one embodiment, the lower end of the mass structure is connected with the guide rail by a mortise and tenon structure. In one embodiment, the mass structure comprises a mass container filled with shock absorbing particles. In one embodiment, the mass container is of a multi-layer structure, and each layer of cavity is filled with the shock absorbing particles. In one embodiment, the mass container is of a double-la