CN111120768A

CN111120768A - Pipeline vibration absorption device based on nonlinear adjustment technology

Info

Publication number: CN111120768A
Application number: CN202010066471.8A
Authority: CN
Inventors: 董雷; 陈旭东; 卫大为; 赵博; 蒋建辉
Original assignee: Thermal Power Research Institute
Current assignee: Xian Thermal Power Research Institute Co Ltd
Priority date: 2020-01-20
Filing date: 2020-01-20
Publication date: 2020-05-08

Abstract

A pipeline vibration absorption device based on a nonlinear adjustment technology comprises a semi-cylindrical outer shell and a semi-cylindrical inner shell, wherein a left cover plate and a right cover plate are respectively arranged on two sides of the semi-cylindrical outer shell and two sides of the semi-cylindrical inner shell, baffle plates are respectively arranged at the upper ends and the lower ends of the semi-cylindrical outer shell and the semi-cylindrical inner shell, the semi-cylindrical outer shell, the semi-cylindrical inner shell, the left cover plate, the right cover plate and the baffle plates form a sealed semi-cylindrical cavity, the cavity divides the cavity space into a plurality of chambers through the baffle plates, a vibration body is arranged on a guide pillar in each chamber. The invention has the characteristics of simple structure, reasonable design, convenient installation and operation, wide effective vibration absorption frequency band and good vibration absorption energy consumption effect.

Description

Pipeline vibration absorption device based on nonlinear adjustment technology

Technical Field

The invention relates to the technical field of pipeline vibration absorbers, in particular to a pipeline vibration absorbing device based on a nonlinear adjusting technology.

Background

Vibration refers to the reciprocating motion of all or part of an object along a straight line or a curve, and has a certain time law and period. The intensity of the vibration is measured by the vibration quantity, which can be the displacement, speed or acceleration of the vibrator. If the vibration quantity exceeds the allowable range, the mechanical equipment generates large dynamic load and noise, thereby affecting the working performance and the service life of the mechanical equipment, and if the vibration quantity exceeds the allowable range, the mechanical equipment can lead to early failure of parts. When designing mechanical equipment, carefully considering what kind of vibration, namely linear vibration or nonlinear vibration, can occur to a designed object; whether periodic or random; the degree of vibration. The method of controlling the amount of vibration within the allowable range is a problem to be solved when deciding the design. When the existing mechanical equipment generates vibration exceeding the allowable range, vibration absorption measures need to be taken. Various types of vibration absorbers may be provided in order to reduce the vibration of the mechanical equipment itself. In order to reduce the influence of the vibration of the mechanical equipment on the surrounding environment or reduce the influence of the vibration of the surrounding environment on the mechanical equipment, vibration isolation measures can be taken. When the system is excited by transient state, its force, displacement, speed and acceleration change suddenly, so called impact. Mechanical devices generally withstand weak impacts but do not withstand strong impacts. In order to protect the mechanical equipment from damage due to strong impacts, cushioning measures may be taken to mitigate the effects of the impact. When the airplane lands, the tires, the landing gear, the buffer strut and the like respectively bear and absorb a part of impact energy, so that the airplane is protected from safe landing. The fundamental approach to reducing mechanical noise is primarily to control the vibration of the noise source, and where desired, mufflers may also be provided.

The vibration isolation technology is adopted to reduce the transmission rate of vibration; damping the vibration of the object and reducing the sound radiation to the space; the use of dynamic vibration absorbers to transfer and dissipate the mechanical vibration energy into an additional vibration system is known as vibration control. In noise control engineering, vibration control technology is an important aspect. Some precision machines, precision meters, and laboratories that require low noise also require vibration control to avoid the effects of environmental vibrations on them. Vibration control is widely applied in modern engineering, and many projects fail because resonance effect is not considered, so economic loss and casualties are caused. Therefore, its research value is self-evident.

Generally, three ways are adopted for suppressing the vibration of the structural member, namely active control, passive control and active and passive combined control. The active control system comprises a sensor, a controller, an actuator, a piezoelectric actuator, a hydraulic/pneumatic actuator, a sensor, a controller and an actuator, wherein the sensor is used for acquiring vibration signals of a controlled object and inputting the vibration signals into the controller, the controller designs control parameters according to different control methods and outputs control signals, the output control signals control the actuator to realize the vibration control of the controlled object, and the piezoelectric actuator, the electromagnetic actuator and the hydraulic/pneumatic actuator are in the form of common active control technologies. Because an external energy source is needed and the durability and stability of practical application are poor, the active control mode is less applied in industry at present. The passive control is a vibration absorption technology without the support of an energy source outside a system, and a common pipeline passive vibration absorption device is provided with a tuned mass damper and the like. The passive control is a kind of control in the middle and after, it has simple structure, no need of energy source and low cost, but its frequency band control range and vibration absorbing effect are limited. The active and passive combined control is to utilize the respective advantages of the active control and the passive control to mutually make up the respective defects, realize the accurate control of the target, have good vibration absorption effect, but have complex structure and high cost, and need an energy source, thereby limiting the application range of the active and passive combined control.

In order to improve the accuracy of vibration control and the stability of operation of the equipment, and in the case of inconvenient energy supply, passive control is widely applied, especially, in vibration suppression of industrial equipment. In addition, from the viewpoint of energy saving, a better passive control vibration absorption device is also required. The passive control vibration absorption device drives the passive control vibration absorption device by utilizing energy generated by the self-movement of the structural member, so that the passive control vibration absorption device moves, absorbs and consumes the energy generated by the vibration of the structural member, realizes quick energy consumption, reduces the amplitude of the structural member, improves the movement precision, reduces the mutual movement abrasion of the structural member and improves the fatigue strength of the structural member. However, the conventional passive control vibration absorption device often generates large noise in the movement process and pollutes the working environment, and the conventional passive control vibration absorption device often mainly controls linear vibration, so the frequency band range of the device is narrow, only a few effective frequency points can be subjected to vibration control, vibration absorption in a wide frequency domain range cannot be realized, and the vibration energy dissipation effect is not ideal.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a pipeline vibration absorption device based on a nonlinear adjustment technology, which has the characteristics of simple structure, reasonable design, convenience in installation and operation, wide effective vibration absorption frequency band and good vibration absorption energy consumption effect.

In order to achieve the purpose, the invention adopts the technical scheme that:

a pipeline vibration absorbing device based on a nonlinear adjustment technology comprises a semi-cylindrical outer shell 1 and a semi-cylindrical inner shell 5 which are coaxial, wherein a left cover plate 7 and a right cover plate 8 are respectively arranged at two ends of the semi-cylindrical outer shell 1 and the semi-cylindrical inner shell 5, the side edge of the semi-cylindrical outer shell 1 and the side edge of the semi-cylindrical inner shell 5 are connected through a baffle 6, the semi-cylindrical outer shell 1, the semi-cylindrical inner shell 5, the left cover plate 7, the right cover plate 8 and the baffle 6 form a sealed semi-cylindrical cavity, the cavity is divided into a plurality of chambers through partition plates 3, a vibrating body 2 is arranged on a guide post 13 in each chamber, the guide post 13 is fixed on the wall of a vibration absorber, and the vibrating body 2.

In the plurality of cavities in the cavity, the moving directions of the vibrating bodies 2 along the guide post 13 can be the same or different, and the vibration absorption in the corresponding directions can be realized by the movement of the vibrating bodies 2 along different directions.

The cavity can be internally provided with at least one free vibration body 2 without a guide post.

The vibrating body 2 is in a square, round or any shape structure.

The cavity is filled with a certain amount of viscous fluid, and the viscous fluid does not fill the space of the cavity and occupies about 70-95% of the space of the cavity.

The inner side of the inner shell 5 is provided with a vibration absorption pad 10, and the baffle 6 of the cavity is provided with a mounting hole.

The vibrating body 2 is arranged on a guide post 13 in a penetrating mode, one end of the vibrating body 2 is connected with a nonlinear spring 12, the other end of the nonlinear spring is connected with a wall, and a damping hole 11 parallel to the guide post 13 is formed in the vibrating body 2.

The cavity is filled with a certain amount of viscous fluid 4.

The invention has the beneficial effects that:

1. structural design is simple, simple to operate, two bump levelers are to detaining on the pipeline, through bolted connection fixed can, easy operation, it is effectual to inhale the bump levelly, inhale and shake efficiently.

2. The vibration body in the vibration absorber can have a certain vibration direction, which is beneficial to absorb vibration in a certain vibration direction, and the invention of the vibration absorber is also advantageous.

3. The invention can effectively solve the problem that the combined control of active control and active and passive control is difficult to be applied to occasions, and can also be used in the occasions where the pipeline is difficult to install the vibration absorption support, thereby effectively solving the problem of pipeline vibration.

4. The vibration absorber is arranged on a pipeline to be absorbed, the vibrating body is connected by the nonlinear spring, and under the action of the nonlinear spring, the energy transferred to the mass block is less transferred back to the structural member, so that most of energy is transferred. The mass block collides with the wall, so that the collision energy consumption effect is achieved. In addition, the shaking of the fluid in the cavity can also play a role in absorbing energy, and the fluid can absorb noise and shock waves generated when the mass collides with a wall. Under the multiple action, the vibration amplitude of the structural part to be absorbed is quickly attenuated.

5. The invention does not need external energy supply and has low use cost. The vibration of the structural member can be effectively reduced without a complex active control system.

Drawings

FIG. 1 is a schematic diagram of the present invention.

Fig. 2 is a schematic view of the overall structure of the present invention.

Fig. 3 is a side view of the present invention.

Fig. 4 is a schematic structural diagram of a cavity in an embodiment of the invention.

1-an outer shell; 2-a vibrating body; 3-a separator; 4-a viscous fluid; 5-an inner housing; 6, a baffle plate; 7-left cover plate; 8-right cover plate; 9-free vibration body; 10-soft gasket; 11-damping orifice; 12-a non-linear spring; 13-guide pillar.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

A pipe vibration absorber as shown in fig. 1, 2 and 3 has a semi-cylindrical structure to facilitate installation on a pipe. The vibration absorber structure comprises a semi-cylindrical outer shell 1, a semi-cylindrical inner shell 5, a baffle 6, a left cover plate 7 and a right cover plate 8, and all parts are welded to form a closed semi-cylindrical shell. Inside the housing, the cavity space is divided into a plurality of chambers by partitions 3. In each chamber there is a vibrating body 2 mounted on a guide post 13, the guide post 13 being fixed to the wall of the tank, the vibrating body 2 being slidable along the guide post 13. The directions of movement of the individual oscillating bodies 2 along the guide posts 13 may be the same or different in a plurality of chambers within the housing, the directions of oscillation being determined by the direction in which the structural member oscillates. The vibrating body 2 in the cavity can be square or round, and can also be in any shape structure. Each cavity is filled with a certain amount of viscous fluid, and the viscous fluid does not fill the cavity space and occupies about 70-95% of the cavity space. A shock absorption pad 10 is arranged on the inner side of the inner shell 5, and a mounting hole is arranged on a baffle plate (6) of the cavity.

Fig. 4 shows a specific structure of a chamber. In the cavity is mounted a guide post 13, the vibrating body 2 is threaded on the guide post 13, one end of the vibrating body is connected with a nonlinear spring 12, the other end of the nonlinear spring is connected with the wall, and a damping hole 11 which is parallel to the guide post 13 is usually arranged on the vibrating body 2. The cavity is filled with a certain amount of viscous fluid 4.

The vibration energy of the pipe is absorbed by adjusting the nonlinear parameters, the number of the mass blocks and the arrangement, and the amplitude of the pipe is reduced within an acceptable amplitude value range.

The working principle of the invention is as follows:

the vibration absorber is arranged on the outer wall of the pipeline, the pipeline vibrates, the vibration body in the vibration absorber is excited to move through the nonlinear spring, and the nonlinear spring is mainly used for enabling the vibration energy transmitted back to the pipeline by the vibration body to be as small as possible, particularly the vibration energy of the main frequency. The vibrating body slides along the guide post and collides with the wall surface of the vibration absorber, so that the purpose of rapid energy consumption is achieved through collision, meanwhile, a certain amount of viscous damping fluid is filled in the cavity of the vibration absorber, the vibrating body acts with the fluid in the movement process and also has a certain energy consumption effect, and the fluid also has a certain energy consumption effect under the shaking effect in the cavity; one of the more important functions of the viscous fluid is to eliminate high frequency vibrations caused by impact vibrations. In order to eliminate the vibration of the pipeline in three directions, a plurality of cavities are distributed in the vibration absorber, each direction is provided with a plurality of cavities, and the moving direction of a vibrating body in each cavity is consistent with the corresponding direction. Each vibration is provided with a damping hole, so that the damping effect of the vibration body in the motion process is increased, and the purpose of quickly consuming energy is achieved. Viscoelastic vibration absorption materials are attached to the inner wall of the box body, so that the collision recovery coefficient is increased, and the collision energy consumption is improved. In a word, a plurality of energy consumption measures are simultaneously realized on the vibration absorber, and the aim of the vibration absorber mainly achieves the aim of fast energy consumption.

Claims

1. The pipeline vibration absorbing device based on the nonlinear adjustment technology is characterized by comprising a semi-cylindrical outer shell (1) and a semi-cylindrical inner shell (5) which are coaxial, wherein a left cover plate (7) and a right cover plate (8) are respectively arranged at two ends of the semi-cylindrical outer shell (1) and two ends of the semi-cylindrical inner shell (5), the side edge of the semi-cylindrical outer shell (1) and the side edge of the semi-cylindrical inner shell (5) are connected through a baffle (6), the semi-cylindrical outer shell (1), the semi-cylindrical inner shell (5), the left cover plate (7), the right cover plate (8) and the baffle (6) form a sealed semi-cylindrical cavity, the cavity divides the cavity space into a plurality of cavities through partition plates (3), a vibrating body (2) is arranged on a guide post (13) in each cavity, and the guide post (13) is fixed on, the vibrator (2) slides along the guide post (13).

2. The pipe vibration absorber based on the nonlinear adjustment technology as recited in claim 1, wherein in the plurality of chambers inside the cavity, the moving direction of each vibrating body (2) along the guide post (13) can be the same or can be at any angle.

3. The pipe vibration absorber based on the non-linear adjustment technology as recited in claim 1, wherein the cavity can be placed with at least one free vibration body (2) without guide posts.

4. The pipe vibration absorber based on the non-linear adjustment technology as recited in claim 1, wherein the vibrating body (2) is square, circular or any shape structure.

5. The pipe vibration absorber according to claim 1 wherein the chamber is filled with a viscous fluid in an amount of about 70% to about 95% of the chamber volume.

6. The pipe vibration absorber based on the non-linear adjustment technology as claimed in claim 1, wherein the inner side of the inner housing (5) is provided with a vibration absorbing pad (10), and the baffle (6) of the chamber is provided with a mounting hole.

7. The pipe vibration absorber based on the nonlinear adjustment technology as recited in claim 1, wherein the vibration body (2) is threaded on a guide post (13), one end of the vibration body (2) is connected with a nonlinear spring (12), the other end of the nonlinear spring is connected with a wall, and the vibration body (2) is provided with a damping hole (11) parallel to the guide post (13).