Multi-channel active vibration reduction system
By adopting dual secondary source configuration and single-channel control algorithm in a multi-channel active vibration-absorbing system, the channel decoupling is achieved, which solves the problems of high complexity and slow convergence speed caused by channel coupling, and improves the control effect and efficiency of the system.
Patent Information
- Application Number
- CN202510590975.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2024-07-16
- Filing Date
- 2025-05-08
- Publication Date
- 2025-08-12
Smart Images
Figure CN120469496A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of vibration noise control, and in particular relates to a multi-channel active vibration reduction system. 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 to generate a signal at the target location that is equal in magnitude and opposite in phase to the interfering noise or vibration by placing a secondary source outside the noise source, thereby actively canceling out the noise.
[0003] Multi-channel active vibration reduction systems are commonly used to control low-frequency vibrations in large structures or modules. Due to the inherent vibration characteristics of the structure or module, these active control systems typically have large channel sizes and strong coupling between control channels. This results in high computational complexity in the control algorithm and slow control convergence, impacting the system's control effectiveness in complex vibration and noise environments.
[0004] In order to improve the control convergence speed and control effect of the strongly coupled multi-channel active vibration reduction system, it is necessary to reduce the coupling effect between channels and make the system a "weakly" coupled system. This issue has also become one of the key issues that academia and industry have focused on for a long time. Summary of the Invention
[0005] The main purpose of the present invention is to propose a multi-channel active vibration reduction system that can achieve channel decoupling. By reducing the channel coupling effect of the active vibration reduction system, independent channel control is achieved, and the system converges quickly, thereby achieving the purpose of improving the system control effect.
[0006] The present invention adopts a dual-secondary source configuration method in a multi-channel active vibration reduction system to establish a channel decoupling mechanism between the error sensors, thereby realizing multi-channel active vibration reduction decoupling control, replacing traditional multi-channel centralized control with single-channel independent control, effectively improving the control convergence speed of the multi-channel active vibration reduction system and improving the control effect.
[0007] The technical solution adopted by the present invention is as follows:
[0008] A multi-channel active vibration reduction system includes: a sensor group, connecting wires, a dual secondary source group, connecting wires, a controller, a power amplifier component, and a junction box. The controller also includes a decoupling filter, and each dual secondary source group includes a control filter, a control source, and a decoupling source.
[0009] A multi-channel active vibration reduction system works as follows:
[0010] The sensor group picks up vibration signals from the control area and transmits them to the controller via connecting cables and a junction box. The controller uses the vibration signals from the control area picked up by the sensor group as the target control signal, or error signal. The controller employs an independent single-channel control algorithm and uses the single-channel error signal to update the control filters of each of the two secondary source groups to generate control signals. The control signals are directly output to the control sources in the two secondary source groups. Furthermore, the control signals pass through the decoupling filters within the controller to generate decoupling signals, which are then output to the decoupling sources in the two secondary source groups. The control sources drive the decoupling sources to generate vibrations that offset the vibrations in the control area, achieving "decoupling."
[0011] A multi-channel active vibration reduction system utilizes a dual-secondary source configuration to achieve decoupled control of the multi-channel control system. In a multi-channel control system, a channel-independent control algorithm can be used to update the control filter coefficients, improving the system's convergence speed, stability, and control effectiveness. This method can be further extended to multi-channel active noise control systems. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 Schematic diagram of a four-channel active vibration reduction system according to an embodiment of the present invention.
[0013] Figure 2 This is a control algorithm framework diagram for single-channel decoupling in a multi-channel active vibration reduction system of the present invention.
[0014] Figure 1 Middle mark: (1) sensor group; (2) connecting wire; (3) dual secondary source group; (4) connecting wire; (5) controller; (6) power amplifier assembly; (7) junction box
[0015] Figure 2 Middle mark: controller C, control area Q, control filter W, decoupling filter A, dual secondary source group E, response function S, interference signal d p (n), error signal e(n) DETAILED DESCRIPTION
[0016] like Figure 1-Figure 2 As shown, this embodiment provides a multi-channel active vibration reduction system, comprising: a sensor group (1), a connecting line (2), a dual secondary source group (3), a connecting line (4), a controller (5), a power amplifier component (6), and a junction box (7). The controller (5) further comprises a decoupling filter, and the dual secondary source group (3) further comprises a control filter, a control source, and a decoupling source.
[0017] A multi-channel active vibration reduction system works as follows:
[0018] The sensor group (1) picks up the vibration signal of the control area and transmits the collected signal to the controller (5) through the connecting line (2) and the junction box (7). The controller (5) uses the vibration signal of the control area picked up by the sensor group (1) as the target signal of the control, that is, the error signal. The controller (5) adopts an independent single-channel control algorithm and uses the single-channel error signal to update the control filter of the dual secondary source group (3) to generate a control signal. On the one hand, the control signal is directly output to the control source in the dual secondary source group (3). On the other hand, the control signal passes through the decoupling filter in the controller (5) to generate a decoupling signal output to the decoupling source of the dual secondary source group (3). The control source drives the decoupling source to generate vibration, thereby achieving "decoupling".
[0019] Attachment Figure 2 This is a control algorithm framework diagram for a multi-channel active vibration reduction system, using single-channel decoupling as an example.
[0020] Where C is the controller, Q is the control area, W is the control filter, and A is the decoupling filter. The controller C uses the picked-up control area Q signal as the target signal for control, i.e., the error signal e(n). n represents the number of channels. For example, n=1 represents the error signal e(1) of the first channel. The controller C uses e(1) to update the control filter W and generate the control signal U. M , one of the control signals U M Output to the control source, another control signal U M The decoupling signal U is generated by the decoupling filter A L-M , decoupling signal U L-M Output to the decoupling source. The control source and the decoupling source operate in the dual secondary source group E to generate the response function S(n) from the dual secondary source group E to the control area Q. n represents the number of channels. For example, n=1 represents the response function S(1) of the first channel. The response function S(n) is related to the interference signal d at the control area Q. p (n) cancel each other out, n represents the number of channels, such as n = 1, which means the interference signal d of the first channel p (1), that is, the response function S(1) in the control area Q and the interference signal d p (1) The active damping of the first channel is completed, that is, decoupling. If the control area Q has n channels, the response function S(n) at the control area Q is related to the interference signal d p (n) Active damping of n channels, i.e. decoupling, is completed.
[0021] In order to achieve single-channel decoupling, the following relationship is required to be satisfied at the control frequency jω:
[0022] U L-M = U M ×A (1)
[0023] After adopting the decoupling control mode, the error signal e(n) in the control region Q can be expressed as follows, where I is the identity matrix:
[0024] e(n)= U M ×(Ι+A) ×S(n)+ d p (n) (2)
[0025] That is, the error signal is only related to the signal of the control source and the interference signal. At this time, the multi-channel active vibration reduction system can be degenerated from a coupled control system to a decoupled control system. A single-channel control algorithm can be used instead of the traditional coupled control algorithm for calculation, which can not only reduce the calculation amount of the control system, but also effectively improve the effect of the control system.
[0026] To facilitate system installation and achieve decoupling, a dual-secondary source configuration is employed. Each dual-secondary source group includes a control source and a decoupling source. Therefore, a control system with n channels, consisting of one controller, n dual-secondary source groups (including n control sources and n decoupling sources), and n sensors, can ultimately achieve decoupled control of n target positions.
Claims
1. A multi-channel active vibration reduction system, characterized in that: include: A sensor group (1), a connecting line (2), a dual secondary source group (3), a connecting line (4), a controller (5), a power amplifier component (6), and a junction box (7); a decoupling filter is provided in the controller (5), and each of the dual secondary source groups (3) includes a control filter, a control source, and a decoupling source.
2. The multi-channel active vibration reduction system according to claim 1, characterized in that: The system works as follows: The sensor group (1) picks up the vibration signal of the control area, and the collected signal is transmitted to the controller (5) through the connecting line (2) and the junction box (7); The controller (5) uses the vibration signal of the control area picked up by the sensor group (1) as the target signal of control, i.e., the error signal, and adopts an independent single-channel control algorithm to update the control filter of the dual secondary source group (3) using the single-channel error signal to generate a control signal; On the one hand, the generated control signal is directly output to the control source in the dual secondary source group (3); on the other hand, the control signal is passed through the decoupling filter in the controller (5) to generate a decoupling signal, which is output to the decoupling source of the dual secondary source group (3). The control source drives the decoupling source to generate vibration to offset the vibration of the control area to achieve "decoupling".
3. The multi-channel active vibration reduction system according to claim 2, characterized in that: At the control frequency jω, the decoupling signal U L-M , control signal U M The relationship between the decoupling filter A and U is: L-M =U M ×A.
4. The multi-channel active vibration reduction system according to claim 2, characterized in that: After adopting the decoupling control mode, the error signal e(n) at the control area Q satisfies the expression: e(n) = U M ×(Ι+A)×S(n)+d p (n), where I is the identity matrix, S(n) is the response function of the dual secondary source group E to the control region Q, and d p (n) is the interference signal at the control area Q.
5. The multi-channel active vibration reduction system according to claim 1, characterized in that: A dual-secondary source configuration is adopted. In a control system with n channels, there is one controller (5), n dual-secondary source groups (3), and the n dual-secondary source groups (3) include n control sources, n decoupling sources, and n sensors. The system can realize decoupling control of n target positions.