CN-121977040-A - Pipeline active control device based on piezoelectric stack

CN121977040ACN 121977040 ACN121977040 ACN 121977040ACN-121977040-A

Abstract

The application provides a pipeline active control device based on a piezoelectric stack, which comprises a pipeline butt joint assembly, wherein a clamp can be adapted to pipelines with different pipe diameters, the vibration control direction is adjustable, a displacement amplifying device is composed of a plurality of actuating power rods, lever arm bridges and the like by utilizing a lever principle, displacement amplification is realized, stability is guaranteed, a piezoelectric stack actuator is cylindrical and is convenient to connect and fix, an installation base assembly ensures integral stable installation, and a control module is internally provided with a hysteresis compensation algorithm and comprises a hysteresis modeling unit and a deep neural network compensation unit based on Bouc-Wen models. The device can actively output control force according to pipeline vibration to inhibit vibration, displacement is amplified and enhanced, hysteresis compensation improves precision, the clamp adapts to different pipe diameters and vibration directions, custom cost is reduced, installation and maintenance are convenient, complex vibration capability is enhanced, and stable operation of a pipeline system is guaranteed.

Inventors

WU JIANGHAI
YIN ZHIYONG
Su kaiquan
TANG DAIJIE
XIONG CHENXI
DUAN YONG
Jiang lingwen

Assignees

中国船舶科学研究中心

Dates

Publication Date: 20260505
Application Date: 20260319

Claims (10)

1. An active control device for a pipeline based on a piezoelectric stack is characterized by comprising: The pipeline butt joint assembly comprises a pipeline clamp which is used for being connected with the outer wall of the pipeline in an adapting way, and a mounting plate which is used for mounting and fixing the pipeline clamp; One end of the displacement amplifying device is connected with the pipeline butt joint assembly and is used for amplifying the output displacement of the actuator; the piezoelectric stack actuator is connected with the other end of the displacement amplifying device and used for outputting active control acting force, and acts on the fluid conveying pipeline through the pipeline clamp after being amplified by the displacement amplifying device; The mounting base assembly comprises a sleeve, an abutting plate and a connecting bolt, wherein the piezoelectric stack actuator is arranged in the sleeve, and the abutting plate for mounting the displacement amplifying device is further connected to the opening of the sleeve and used for fixing the piezoelectric stack actuator and the displacement amplifying device so as to realize the mounting and positioning of the integral structure; and the control module is electrically connected with the piezoelectric stack actuator, is internally provided with a hysteresis compensation algorithm and is used for outputting a control signal and compensating hysteresis nonlinearity of the piezoelectric stack actuator, so that vibration control precision is improved.
2. The active control device for a pipeline based on a piezoelectric stack according to claim 1, wherein the pipeline clamp comprises two spliced semicircular arc structures, and the two spliced semicircular arc structures are detachably connected through bolts and are used for adapting to the flow transmission pipelines with different pipe diameters.
3. The active control device for a pipeline based on a piezoelectric stack according to claim 2, wherein the vibration control direction of the pipeline clamp is adjustable by adjusting the position of a connecting bolt with a semicircular arc structure, so as to realize multi-directional pipeline vibration suppression.
4. The active pipeline control device based on the piezoelectric stack according to claim 1, wherein the displacement amplifying device comprises a plurality of actuating rods which are connected end to end in the height direction, the actuating rods are of rectangular columnar structures, a plurality of lever arm bridges are arranged on the end faces of the side walls of the actuating rods, two adjacent lever arm bridges are connected with each other in the height direction, and a first supporting part which is in butt joint with the pipeline butt joint assembly is connected above one side of the uppermost lever arm bridge close to the actuating rod; The lower end of the actuating power rod is connected with a cross-shaped extension part, and the middle part of the lower end of the extension part is provided with a mounting part which is in butt joint with the piezoelectric stack actuator.
5. The active control device for a pipeline based on a piezoelectric stack according to claim 4, wherein four elastic supporting structures connected with the lever wall bridge are further arranged on the side wall of the actuating rod below the lever wall bridge, and a second supporting part butted with the butt plate is connected below one side of the lowest elastic supporting structure away from the actuating rod.
6. The active control device for a pipeline based on a piezoelectric stack according to claim 4, wherein the end of the lever wall bridge connected with the actuating rod is provided with two mutually adjacent sheet-shaped grooves with opposite openings in the height direction.
7. The active control device for a pipeline based on a piezoelectric stack according to claim 1, wherein the piezoelectric stack actuator has a cylindrical structure, the bottom and the top of the piezoelectric stack actuator are respectively provided with a concave threaded hole and a convex threaded hole, the bottom is connected with the displacement amplifying device through an amplifying connecting rod, and the bottom is fixed with the sleeve.
8. The active control device for a piezoelectric stack-based conduit according to claim 1, wherein the bottom of the piezoelectric stack actuator is coupled to the sleeve by a bottom fastening bolt in the mounting base assembly.
9. The active control device for a pipeline based on a piezoelectric stack according to claim 1, wherein the hysteresis compensation algorithm of the control module comprises a hysteresis modeling unit based on Bouc-Wen model and a deep neural network compensation unit, and the deep neural network compensation unit is used for correcting hysteresis nonlinearity of the piezoelectric stack actuator.
10. The active control device for a pipeline based on a piezoelectric stack according to claim 9, wherein the Bouc-Wen model describes hysteresis of piezoelectric materials, and a first-order nonlinear differential equation is adopted to construct a second-order dynamics equation by changing the magnitude of parameter values in the model; the second order kinetic equation is as follows: Wherein, the Is the displacement in the direction of the generalized coordinate axis, For the virtual hysteresis displacement, Is the equivalent stiffness coefficient of the system, As a ratio of linear to nonlinear stiffness, And The mass and damping coefficient of the object respectively, Is subject to external stimuli.

Description

Pipeline active control device based on piezoelectric stack Technical Field The invention relates to the technical field of pipeline vibration excitation, in particular to a pipeline active control device based on a piezoelectric stack. Background The liquid filling pipeline is an important component in the current industries such as ships, nuclear industry, chemical industry and the like, and can cause vibration fatigue damage of a pipeline system and cause disasters such as leakage and the like due to long-term vibration of equipment. In the existing control technologies such as pipeline vibration absorption, passive control measures are mainly adopted, but the passive vibration absorption measures cannot be adjusted along with the change of frequency. Because the operation condition of the equipment is changed, the excitation frequency of the pipeline system can also be changed, and the traditional passive vibration absorber can not be changed at any time and any time. For this purpose we propose a pipeline active control device based on piezoelectric stacks. Content of the application Based on the above, it is necessary to provide a pipeline active control device based on a piezoelectric stack, so that the active vibration control of the pipeline can be realized under different working conditions, and the safe and stable operation of the pipeline system in the industries of ships, nuclear industry, chemical industry and the like can be ensured. The application provides a pipeline active control device based on a piezoelectric stack, which comprises a pipeline butt joint assembly, a displacement amplifying device, a piezoelectric stack actuator, a mounting base assembly and a control module, wherein the pipeline butt joint assembly comprises a pipeline clamp which is used for being connected with the outer wall of a pipeline in an adapting way, a mounting plate which is used for mounting and fixing the pipeline clamp and is used for transmitting vibration restraining acting force, one end of the displacement amplifying device is connected with the pipeline butt joint assembly and is used for amplifying output displacement of an actuator, the piezoelectric stack actuator is connected with the other end of the displacement amplifying device and is used for outputting active control acting force, the piezoelectric stack actuator acts on the pipeline through the pipeline clamp after being amplified by the displacement amplifying device, the mounting base assembly comprises a sleeve, a butt joint plate and a connecting bolt, the piezoelectric stack actuator is arranged in the sleeve, the butt joint plate is further connected with the displacement amplifying device at an opening of the sleeve and is used for fixing the piezoelectric stack actuator and the displacement amplifying device, so that the mounting and positioning of the whole structure are realized, and the control module is electrically connected with the piezoelectric stack actuator and is internally provided with a hysteresis compensation algorithm and used for outputting control signals and compensating hysteresis nonlinearity of the piezoelectric stack actuator and improving vibration control precision. The device can actively output control force to inhibit according to the vibration condition of the pipeline through the cooperative work of the components, the displacement amplifying device enhances the control effect, the hysteresis compensation algorithm of the control module improves the control precision, and the defect of the traditional passive vibration absorbing measure is effectively solved. In other embodiments, the pipe clamp comprises two semi-circular arc structures which can be spliced, and the pipe clamp is detachably connected through bolts and is used for adapting to the flow transmission pipes with different pipe diameters. The pipeline clamp can flexibly adapt to the flow transmission pipelines with different specifications, improves the universality and the applicability of the device, does not need to specially customize the clamp for the pipelines with different pipe diameters, reduces the cost and facilitates the installation and the maintenance. In other embodiments, the vibration control direction of the pipeline clamp can be adjusted by adjusting the position of the connecting bolt with the semicircular arc structure, so that multidirectional pipeline vibration suppression is realized. Through the adjusting mode, vibration of the flow transmission pipeline in different directions can be effectively controlled, the coping capacity of the device for complex vibration conditions is enhanced, the vibration control effect is further improved, and stable operation of a pipeline system is guaranteed. In other embodiments, the displacement amplifying device comprises a plurality of actuating rods connected end to end in the height direction, the actuating rods are of rectangular columnar structures, a plurality of lever arm br