Active damping device for pipeline

Abstract

The invention discloses a pipeline active vibration reduction device and a working method thereof. The device comprises a pipeline downstream sensor, a connecting line, a controller, a pipeline upstream sensor and a secondary source group (a control source, a decoupling source and an active vibration absorption ring). In the working process, a pipeline downstream sensor picks up a target position vibration signal dp (z), a controller takes the vibration signal dp (z) as an error signal e (z), and a control signal y0 (z) is generated through a single-channel independent control algorithm. The control source and the decoupling source are respectively driven by the control signal y0 (z), the control source generates downstream vibration with a response function of # imgabs0 #, the decoupling source receives a decoupling signal y1 (z) generated by the control signal y0 (z) after filtering operation, the decoupling source generates downstream vibration with a response function of # imgabs1 #, and the downstream vibration and the decoupling signal y1 (z) are superposed to offset target position vibration. And meanwhile, vibration response functions transmitted to the upstream by the control source and the decoupling source are mutually counteracted, and vibration is only transmitted to a downstream target position.

Description

Technical Field

[0001] The present invention belongs to the field of vibration and noise control, and specifically relates to a pipeline active vibration reduction device and its working method. The technology is mainly applicable to active pipeline vibration control. Background Art

[0002] Active control technology is a hot topic in current research on vibration and noise control. This technology leverages the principle of wave interference. By placing a control source (also known as a secondary source) outside the noise source, it generates a vibration noise signal at the target location that is equal in magnitude and opposite in phase to the interfering noise or vibration, thereby actively canceling the vibration noise.

[0003] Active pipeline vibration reduction technology is commonly used to control low-frequency vibration transmission in complex pipeline networks. Due to the vibration transmission characteristics of pipelines, when the active pipeline vibration control system is activated, on the one hand, the vibration generated by the control source will be transmitted to the target location of the pipeline control, achieving active cancellation of the vibration at the target location; on the other hand, the vibration generated by the control source will be transmitted along the pipeline to other locations, affecting the convergence of the control system, or transmitted along the pipeline to the noise source equipment, and then transmitted to the installation foundation through the equipment feet, affecting the vibration control effect. To effectively reduce the effectiveness of active pipeline vibration control, it is necessary to decouple the active pipeline vibration control system to achieve directional vibration transmission of the active pipeline vibration control system and eliminate the influence of the control channel outside the control target location. Summary of the Invention

[0004] The main purpose of the present invention is to propose a pipeline active vibration reduction device to reduce the influence of the pipeline control channel on the control target position, realize channel decoupling control, and achieve the purpose of improving the system control convergence speed and control effect.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A multi-channel active vibration reduction device includes: a pipeline downstream sensor, a connecting line, a controller, a pipeline upstream sensor, and a secondary source group; the secondary source group includes: a control source, a decoupling source, and an active vibration absorption ring.

[0007] A pipeline active vibration reduction device works as follows:

[0008] The target position vibration signal d is picked up by the downstream sensor of the pipeline p (z), and the collected vibration signal d p(z) is transmitted to the controller through the connecting line. The controller (3) uses the signal picked up by the downstream sensor of the pipeline as the target signal that needs to be controlled and eliminated, that is, the error signal e(z), and performs control algorithm calculations. The controller uses a single-channel independent control algorithm to perform calculation updates, generates a control signal y0(z), and drives the secondary source group to work. On the one hand, the control signal y0(z) is directly output to the control source in the secondary source group. The response function generated by the control source to the downstream sensor of the pipeline is S0(z), and drives the active vibration absorption ring to actuate, and the generated vibration is transmitted unidirectionally to the target position of the downstream control of the pipeline; on the other hand, the decoupling source (5) receives the decoupling signal y1(z) generated by the control signal y0(z) after filtering operation. The response function generated by the decoupling source to the downstream sensor of the pipeline is S1(z), and drives the active vibration absorption ring to actuate, and the generated vibration is transmitted unidirectionally to the target position of the downstream control of the pipeline; the vibrations generated by the control source and the decoupling source and transmitted to the downstream of the pipeline are completely offset by the vibration of the target position after superposition. The response function generated by the control source to the upstream sensor of the pipeline is The response function of the decoupled source to the upstream sensor of the pipeline is: Furthermore, the vibration responses generated by the control source and the decoupling source along the upstream pipeline completely cancel each other out. Because the sum of the vibrations generated by the control source and the decoupling source along the upstream pipeline is always zero, this control mode has no impact on the vibrations upstream of the pipeline. The upstream pipeline sensor monitors the vibration responses transmitted upstream by the control source and the decoupling source to verify their complete cancellation.

[0009] Therefore, when the secondary source group is working, it only generates vibrations that are transmitted to the target position downstream of the pipeline. The vibrations generated downstream by the control source and the decoupling source are used to offset the original vibrations transmitted downstream of the pipeline, thereby achieving the purpose of one-way transmission control of pipeline vibrations. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the composition of a pipeline active vibration reduction device.

[0011] Figure 2 This is a control algorithm framework diagram for single-channel decoupling of a pipeline active vibration reduction device according to the present invention.

[0012] Figure 1 Markings in the figure: (1) sensor downstream of the pipeline; (2) connecting line; (3) controller; (4) control source; (5) decoupling source; (6) active vibration absorption ring; (7) sensor upstream of the pipeline; e(z) is the error signal; y0(z) is the control signal, y1(z) is the decoupling signal, and the response function generated by the control source to the sensor upstream of the pipeline is The response function of the decoupled source to the upstream sensor of the pipeline is: The response function of the control source to the downstream sensor in the pipeline is S0(z), and the response function of the decoupling source to the downstream sensor in the pipeline is S1(z).

[0013] Figure 2 Middle mark: controller W, decoupling source A, response function S, vibration signal d p (z), error signal e(z), y0(z) is the control signal, y1(z) is the decoupling signal, the response function from the control source to the downstream sensor in the pipeline is S0(z), and the response function from the decoupling source to the downstream sensor in the pipeline is S1(z) DETAILED DESCRIPTION

[0014] like Figure 1 As shown, this embodiment provides a multi-channel active vibration reduction device, comprising: a downstream pipeline sensor (1), a connecting line (2), a controller (3), an upstream pipeline sensor (7), and a secondary source group; the secondary source group comprises a control source (4), a decoupling source (5), and an active vibration absorption ring (6).

[0015] A pipeline active vibration reduction device works as follows:

[0016] The target position vibration signal d of the pipeline control is picked up by the downstream sensor (1) p (z), and the collected vibration signal d p (z) is transmitted to the controller (3) via the connecting line (2). The controller (3) uses the signal picked up by the downstream sensor (1) as the target signal to be controlled and eliminated, namely the error signal e(z), and performs control algorithm calculations. The controller (3) uses a single-channel independent control algorithm to perform calculation updates and generates a control signal y0(z) to drive the secondary source group to operate. On the one hand, the control signal y0(z) is directly output to the control source (4) in the secondary source group. The response function generated by the control source (4) to the downstream sensor of the pipeline is S0(z), and the active vibration absorption ring (6) is driven to operate, and the vibration generated is transmitted in one direction to the target position of the downstream control of the pipeline. On the other hand, the decoupling source (5) receives the decoupling signal y1(z) generated by the control signal y0(z) after filtering operation. The response function generated by the decoupling source (5) to the downstream sensor of the pipeline is S1(z), and the active vibration absorption ring (6) is driven to operate, and the vibration generated is transmitted in one direction to the target position of the downstream control of the pipeline. The vibrations generated by the control source and the decoupling source and transmitted to the downstream of the pipeline are completely offset by the vibration of the target position after superposition. The response function generated by the control source (4) to the upstream sensor (7) of the pipeline is: The response function generated by the decoupling source (5) to the upstream sensor (7) in the pipeline is The vibration responses of the upstream pipeline generated by the control source and the decoupling source completely cancel each other out. The single-channel independent control algorithm updates the control signal y0(z) in real time to achieve the target position vibration d p (z) is dynamically offset and the impact on the upstream vibration of the pipeline is avoided.

[0017] Attachment Figure 2 This is a block diagram of the working principle of a pipeline active vibration reduction device. Where W is the control filter, y0(z) is the control signal, y1(z) is the decoupling signal, A is the decoupling filter, and A(z) is the transfer function of the decoupling filter.

[0018] y1(z)=y0(z)*A(z) (1)

[0019] Among them, z at the operating frequency ω is e jω In the upstream sensor of the pipeline, the response function of the control source in the secondary source group to the upstream sensor of the pipeline is The response function from the decoupling source to the upstream sensor in the pipeline is: In order to make the vibration generated by the secondary source group unidirectionally transmitted, it is required to control the frequency jω

[0020]

[0021] The response function from the control source to the downstream sensor in the pipeline is S0(z), and the response function from the decoupling source to the downstream sensor in the pipeline is S1(z). After adopting the upstream decoupling mode, the signal at the downstream sensor position in the pipeline can be expressed as:

[0022] e(z)=y0(z)S0(z)+y0(z)A(z)S1(z)+d p (z) (3)

[0023] That is, the acceleration sensor signal corresponding to the control channel is only related to the control signal and the interference signal. Therefore, a single-channel control algorithm can be used for control operations.

[0024] An active pipeline vibration reduction device and operating method have the advantage of using a control system that uses unidirectional vibration transmission generated by a secondary source group to reduce the system coupling caused by vibration generated at the target location in active pipeline vibration control being transmitted upstream along the pipeline. This improves the control system's convergence speed, algorithm stability, and control effectiveness. This method can be further extended to active pipeline noise control systems.

Claims

1. A pipeline active vibration reduction device, comprising a pipeline downstream sensor (1), a connecting line (2), a controller (3), a pipeline upstream sensor (7), and a secondary source group, wherein the secondary source group comprises a control source (4), a decoupling source (5), and an active vibration absorbing ring (6), characterized in that: The pipeline downstream sensor (1) is used to pick up the vibration signal d of the pipeline control target position p (z), and transmit the vibration signal d through the connecting line (2) p (z) transmitting to the controller (3); The controller (3) converts the vibration signal d p (z) is used as the error signal e(z), which is calculated through a single-channel independent control algorithm to generate a control signal y0(z); The control signal y0(z) drives the control source (4) and the decoupling source (5) to work respectively; The control source (4) directly receives the control signal y0(z) and drives the active vibration absorbing ring (6) to generate vibration transmitted to a target position downstream of the pipeline, and the response function of the corresponding sensor (1) downstream of the pipeline is S0(z); The decoupling source (5) receives the decoupling signal y1(z) generated by the control signal y0(z) after filtering operation, and drives the active vibration absorbing ring (6) to generate vibration transmitted to the target position downstream of the pipeline, and the response function of the sensor (1) downstream of the pipeline is S1(z); The downstream vibration generated by the control source (4) and the decoupling source (5) is superimposed on the target position vibration d p (z) Complete cancellation; The vibration responses generated by the control source (4) and the decoupling source (5) and transmitted to the upstream of the pipeline completely cancel each other out, so that the secondary source group only transmits vibration to the downstream target position.

2. The pipeline active vibration reduction device according to claim 1, characterized in that: When the controller (3) operates the error signal e(z) through the single-channel independent control algorithm, the control signal y0(z) is adjusted so that the downstream vibration of the control source (4) and the decoupling source (5) are superimposed to satisfy the following equation: e(z)=y0(z)S0(z)+y0(z)A(z)S1(z)+d p (z), where A(z) is the transfer function of the decoupling filter.

3. The pipeline active vibration reduction device according to claim 1, characterized in that: The response function of the vibration transmitted by the control source (4) to the upstream of the pipeline corresponding to the upstream sensor (7) of the pipeline is: The response function of the vibration transmitted by the decoupling source (5) to the upstream of the pipeline corresponding to the upstream sensor (7) of the pipeline is: And both satisfy: To achieve complete cancellation of upstream vibration response.

4. The pipeline active vibration reduction device according to claim 1, characterized in that: The active vibration absorbing ring (6) serves as an executive component of the control source (4) and the decoupling source (5), and is driven by the control signal y0(z) and the decoupling signal y1(z) to generate vibrations that are directionally transmitted to a target position downstream of the pipeline.

5. The pipeline active vibration reduction device according to claim 1, characterized in that: The pipeline upstream sensor (7) is used to monitor the vibration response transmitted upstream by the control source (4) and the decoupling source (5) to verify whether the two are completely offset.

6. The pipeline active vibration reduction device according to claim 1, characterized in that: The controller (3) generates the decoupling signal y1(z) by performing a filtering operation on the control signal y0(z) to obtain y1(z)=y0(z)*A(z), wherein A(z) is the transfer function of the decoupling filter.

7. The pipeline active vibration reduction device according to claim 1, characterized in that: The single-channel independent control algorithm updates the control signal y0(z) in real time to achieve the target position vibration d p (z) is dynamically offset and the impact on the upstream vibration of the pipeline is avoided.

8. The pipeline active vibration reduction device according to claim 1, characterized in that: It is suitable for active control of low-frequency vibration in complex pipe networks. It realizes one-way transmission control of vibration through the decoupling design of the secondary source group, thereby improving the convergence speed and control effect of the control system.

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