CN203115003U - Intelligent control system for mechanical structure damping - Google Patents

Abstract

The utility model discloses an intelligent control system for the damping size of a mechanical structure, which comprises a damping material layer, a piezoelectric actuator layer, a sensor and a damping control system, etc., the lower part of the damping material layer is connected with the vibration structure base, and the upper part is connected with the The piezoelectric actuator layer is connected, and the piezoelectric sensor is connected to the lower or upper surface of the vibration structure substrate. The hardware of the damping control system mainly includes a computer, NI-PCI4472 board, DAQ board, charge amplifier, power amplifier, etc., piezoelectric The sensor is connected to the NI-PCI4472 board through the charge amplifier, and the NI-PCI4472 board is connected to the piezoelectric actuator layer through the DAQ board and the power amplifier. The sensor is a piezoelectric sensor, and the damping control system adopts NI control system and damping The control algorithm module can spontaneously change the structural damping, attenuate the vibration, reduce the damage of the mechanical system due to vibration, maintain the accuracy of the equipment, prolong the service life, suppress the noise pollution caused by the structure to the environment, and ensure the physical and mental health of the operators.

Description

Intelligent control system for mechanical structure damping

technical field

The utility model relates to the technical field of mechanical vibration and noise control, in particular to an intelligent control system for the damping size of a mechanical structure.

Background technique

Vibration widely exists in mechanical systems under various working conditions, such as automobiles, trains, ships and other vehicles and aircraft, rockets, satellites and other aircraft. Strong vibration will not only affect the precision and stability of instrumentation work, but also shorten the life of the structure due to fatigue damage, or damage the structure due to resonance. At the same time, the noise generated due to vibration not only causes environmental pollution, but also endangers the physical and mental health of operators. Therefore, it is necessary to reduce the vibration of the equipment. However, judging from the current research status, most of them are controlled by the method of adding damping materials, but it has the following shortcomings:

1) Due to frequent changes in the operating load and operating conditions of the equipment, the intensity of the vibration is also changing. Once the ordinary additional damping material layer is fabricated and installed, its damping value cannot be changed. When the operating environment of the mechanical system changes Severe vibration, especially resonance, does not have the ability to increase damping by itself.

2) In the current passive vibration isolation method, when the foundation has low-frequency vibration, increasing the damping can greatly reduce the vibration amplitude of the structure; but under the high-frequency excitation of the foundation, increasing the damping will actually increase the amplitude of the structure.

Contents of the invention

The utility model aims to solve the above-mentioned deficiencies in the prior art, and provides an intelligent control system for the damping size of the mechanical structure. Attenuate quickly and respond to different environments, reduce damage to the mechanical system due to vibration, maintain equipment accuracy and reliability, prolong the service life of the equipment, and suppress noise pollution caused by the structure to the environment. Ensure the physical and mental health of operators.

In order to achieve the above object, the utility model adopts the following technical solutions:

An intelligent control system for the damping size of a mechanical structure, including a damping material layer, a piezoelectric actuator layer, a sensor and a damping control system, the lower part of the damping material layer is connected to the vibration structure base, and the upper part is connected to the piezoelectric actuator layer Connection, the piezoelectric sensor is connected to the lower surface or upper surface of the vibration structure substrate, the damping control system mainly includes a computer, NIPCI4472 board, DAQ board, charge amplifier, power amplifier, etc., wherein the piezoelectric sensor is connected to the NIPCI4472 board through the charge amplifier Card connection, the NI-PCI4472 board is connected to the piezoelectric actuator layer through the DAQ board, power amplifier.

The hardware of the damping control system adopts NI control system, and the software is a damping control algorithm module.

The NI control system adopts the NI-PCI4472 board, an 8-channel dynamic signal acquisition card for high-precision frequency domain measurement, which is suitable for signal acquisition of vibration sensors; the NI-PCI4472 board is connected and combined with the Lab VIEW sound and vibration toolkit module Using it, it can perform high-precision measurement, and can quickly collect, analyze and record vibration data, which fully meets the collection requirements of vibration state information for the intelligent control system of mechanical structure damping size.

The damping control algorithm module adopts the F-XLMS adaptive filter feedforward active control algorithm module, and the F-XLMS adaptive filter feedforward active control algorithm module includes a structural feature module, a filter parameter module, a comparator module, and an LMS module , the first control channel characteristic module, the second control channel characteristic module, wherein the structural characteristic module is connected with the comparator module, the filter module is connected with the comparator module through the first control channel characteristic module, the comparator module is connected with the LMS module, the second The second control channel characteristic module is connected with the LMS module, and the LMS module is connected with the filter module. The F-XLMS algorithm in the utility model is divided into two cases, one is an F-XLMS algorithm that increases damping, and the other is an inverse F-XLMS algorithm that reduces damping. The former is that when the piezoelectric sensor is attached to the lower surface of the bending vibration structure base, the voltage signal sent by the damping control system is in phase with the sensor; when the piezoelectric sensor is attached to the upper surface of the bending vibration structure base, the damping control system The voltage signal sent out is out of phase with the sensor, and at the same time, the amplitude of the control voltage increases, and the deformation amplitude of the piezoelectric actuator layer also increases, and the damping material layer obtains a large shear deformation, thereby improving the damping of the entire structure; Contrary to the former, the former controls the amplitude and phase of the voltage signal so that the deformation of the piezoelectric actuator layer is close to the deformation of the base structure, so that the damping material layer obtains the minimum shear deformation, thereby reducing the damping of the entire structure.

The F-XLMS adaptive filter feedforward active control algorithm module, for the forced vibration caused by the supporting foundation, when the excitation frequency is less than 1.41 times the structural natural frequency, the F-XLMS algorithm with increased damping can be effectively Control structural vibration; when the excitation frequency is greater than 1.41 times the natural frequency of the structure, the F-XLMS algorithm with reduced damping is used. To meet the requirements of different vibrations: For the forced vibration caused by the supporting foundation, when the structure resonates, increasing the damping can greatly reduce the amplitude of the structure; but under high-frequency excitation, increasing the damping will increase the amplitude of the structure.

The damping material layer adopts chlorinated butyl rubber, or neoprene rubber, or nitrile rubber. Polymer damping materials such as chloroprene rubber, nitrile rubber, and chlorinated butyl rubber are used as vibration-damping materials, which can prevent or reduce damage to equipment caused by mechanical vibration. Chlorinated butyl rubber damping material, because the butyl rubber molecular chain has many methyl groups, the elastic hysteresis is relatively large, so it has excellent damping performance, and after butyl rubber is chlorinated, the reactivity and adhesion performance are significantly improved. The damping material layer is pasted on the surface of the vibrating structure substrate, and the piezoelectric actuator layer is pasted above the damping material layer.

The piezoelectric actuator layer uses piezoelectric polymer polyvinylidene fluoride (PVDF) as the piezoelectric material. This material has a high piezoelectric constant and electromechanical coupling coefficient, so it has high sensitivity and frequency response characteristics. The piezoelectric actuator layer is pasted on the damping material layer, and the upper and lower sides of the piezoelectric actuator layer are respectively connected to the power amplifier through wires. The damping control system sends a control signal, and after passing through the power amplifier, the piezoelectric actuator is When a voltage is applied to the actuator layer, the piezoelectric material has an inverse piezoelectric effect, which drives the damping material layer to elongate or shorten together, causing it to undergo shear deformation. When the piezoelectric sensor is attached to the lower surface of the base panel of the bending vibration structure, the voltage signal sent by the damping control system is in the same phase as the sensor; when the piezoelectric sensor is attached to the upper surface of the base panel of the bending vibration structure, the voltage signal sent by the damping control system The phase of the voltage signal is opposite to that of the sensor, so that the polymer damping material layer obtains a large shear deformation, thereby improving the damping of the entire structure. Conversely, when the amplitude and phase of the control signal make the deformation of the piezoelectric actuator layer close to the deformation of the sensor and in the same direction, the polymer damping material layer obtains the minimum shear deformation, thereby reducing the damping of the entire structure. Therefore, by adjusting the phase of the measuring element and the control signal and the amplitude of the control signal, the intelligent control of the damping can be realized.

The sensor is a piezoelectric sensor, and the piezoelectric sensor is used to feed back the vibration state information of the mechanical device, such as acceleration, amplitude, frequency, etc., to the damping control system to realize intelligent control of damping. It has high sensitivity, small size, light weight, Good dynamic characteristics, fast frequency response and so on.

The working principle of the utility model: for the piezoelectric material, when it is subjected to a force along a certain direction, it will not only produce mechanical deformation, but also be internally polarized, and there will be charges on the surface. When the external force is removed, it can return to the original uncharged state. state, this phenomenon is called piezoelectric effect. On the contrary, if an electric field is applied in the polarization direction of these materials, the electric field will increase the polarization intensity, that is, the distance between the positive and negative bound charges in the piezoelectric material will increase, and it will be mechanically deformed by the electric field force, That is to say, it is elongated or shortened in this direction. When the external electric field is removed, the deformation will disappear. This phenomenon is called the inverse piezoelectric effect. Due to the inverse piezoelectric effect of piezoelectric materials, the strain is proportional to the applied voltage. When the piezoelectric actuator layer is energized, an electric field will be generated at its two ends. By controlling the energized voltage, the electric field strength will be changed, so that the piezoelectric actuator layer will be elongated or shortened accordingly, and the damping material layer will be elongated together. Or shortened, because the change of the strain of the damping material layer will cause its damping size to change accordingly, that is, the shear strain of the damping material layer can be controlled by controlling the expansion and contraction of the piezoelectric actuator layer, so as to realize the controllability of the damping size , to achieve the purpose of controlling the damping size.

The beneficial effects of the utility model:

1. The utility model combines modern control theory, computer technology and piezoelectric material technology. When the mechanical structure vibrates, the structural damping is changed spontaneously, so that the vibration is quickly attenuated, and the intelligent active control of the mechanical structure vibration is realized. Control, reduce the damage of the mechanical system due to vibration, maintain the accuracy of the equipment, prolong the service life of the equipment, and suppress the noise pollution caused by the structure to the environment, ensure the physical and mental health of the operator, and have strong practicability, high reliability and economy good;

2. The piezoelectric sensor is used to monitor the vibration state information of the mechanical device in real time to realize the intelligent control of damping, which has the characteristics of high sensitivity, small size, light weight, good dynamic characteristics and fast frequency response;

3. Using NI-PCI4472 board and Lab VIEW sound and vibration toolkit module for high-precision measurement, it can quickly collect, analyze and record vibration data, fully meeting the requirements of vibration state information collection by the intelligent control system of mechanical structure damping size ;

4. The piezoelectric polymer polyvinylidene fluoride is used as the piezoelectric actuator layer material, which has high sensitivity and frequency response characteristics. By adjusting the phase of the measurement element and the control signal and the amplitude of the control signal, the damping value can be adjusted. intelligent control;

5. Using polymer damping materials such as chlorinated butyl rubber as vibration-absorbing materials can prevent or reduce damage to equipment caused by mechanical vibration.

Description of drawings

Fig. 1 is a structural diagram of the utility model;

Fig. 2 is a schematic diagram of the utility model;

Fig. 3 is the control system diagram of the present utility model;

Fig. 4 Schematic diagram of damping reduction when the structure surface is compressed and deformed;

Fig. 5 Schematic diagram of damping increase when the structure surface is compressed and deformed;

Fig. 6 The principle diagram of damping reduction when the structure surface is elongated and deformed;

Fig. 7. Schematic diagram of damping increase when the structure surface is elongated and deformed;

Fig. 8 is a structure diagram of F-XLMS adaptive filter feedforward active control algorithm.

In the figure: 1. Piezoelectric actuator layer, 2. Damping material layer, 3. Vibration structure substrate, 4. Vibration sensor, 5. Computer with LabVIEW installed, 6. NI-PCI4472 board.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

An intelligent control system for the damping size of a mechanical structure, with reference to Figures 1 to 8, comprising a piezoelectric actuator layer 1, a damping material layer 2, a vibration sensor 4 and a damping control system, the lower part of the damping material layer 2 is in contact with the vibration The structural base 3 is connected, the upper part is connected with the piezoelectric actuator layer 1, the vibration sensor 4 is connected with the lower surface or the upper surface of the vibration structural base 3, and the damping control system mainly includes a computer, NI-PCI4472 board 6, DAQ board, electric charge Amplifiers, power amplifiers, etc., wherein the vibration sensor 4 is connected to the NI-PCI4472 board 6 through the charge amplifier, and the NI-PCI4472 board 6 is connected to the piezoelectric actuator layer 1 through the DAQ board and the power amplifier. The computer adopts the computer installed with LabVIEW.

The vibration sensor 4 is a piezoelectric sensor.

The hardware of the damping control system adopts the NI control system, and the software is the damping control algorithm module; the damping control algorithm module adopts the F-XLMS adaptive filter feedforward active control algorithm module. The FXLMS adaptive filter feedforward active control algorithm module includes a structural feature module C, a filter parameter module W, a comparator module, an LMS module, a first control channel feature module H1, and a second control channel feature module H2, wherein the structural feature Module C is connected to the comparator module, the filter parameter module W is connected to the comparator module through the first control channel feature module H1, the comparator module is connected to the LMS module, the second control channel feature module H2 is connected to the LMS module, and the LMS module is connected to the LMS module. The filter parameter module W is connected, as shown in Fig. 8 for details, wherein the structural feature module C is the matrix matrix of the vibration structure, and the filter parameter module W is an adaptive filter. The F-XLMS adaptive filtering algorithm uses the vibration sensor to extract the signal of the vibration source as the reference signal X, and X is divided into two channels. The former obtains the signal d(n), d(n) and the characteristics of the first control channel after passing through the structural feature module C. The signal of module H1 is processed by the comparator to obtain e(n); the latter passes through the second control channel characteristic module H2 and e(n) together as the input signal of the LMS algorithm, and obtains the secondary control after passing through the filter parameter module W After the signals y(n), y(n) are processed by the first control channel characteristic module H1, the output signals of the control system are obtained. The F-XLMS algorithm in the utility model is divided into two cases, one is an F-XLMS algorithm that increases damping, and the other is an inverse F-XLMS algorithm that reduces damping. The former is that when the piezoelectric sensor is attached to the lower surface of the vibrating structure base, the voltage signal sent by the damping control system is in the same phase as the sensor, and when the piezoelectric sensor is attached to the upper surface of the vibrating structure base, the voltage signal sent by the damping control system is The phase of the voltage signal and the sensor is reversed, and at the same time, the amplitude of the control voltage increases, and the deformation amplitude of the piezoelectric actuator layer also increases, and the damping material layer obtains a larger shear deformation, thereby improving the damping of the entire structure; the latter and In contrast to the former, the amplitude and phase of the voltage signal are controlled to make the deformation of the piezoelectric actuator layer close to the deformation of the base structure, so that the damping material layer obtains the minimum shear deformation, thereby reducing the damping of the entire structure.

The NI control system adopts NI-PCI4472 board card, an 8-channel dynamic signal acquisition card for high-precision frequency domain measurement, which is suitable for signal acquisition of vibration sensors. The piezoelectric sensor is connected to the NI-PCI4472 board through the charge amplifier, and the NI-PCI4472 board is connected to the piezoelectric actuator layer through the DAQ board and the power amplifier.

F-XLMS adaptive filter feedforward active control algorithm module, for the forced vibration caused by the support foundation, when the excitation frequency is less than 1.41 times the natural frequency of the structure, the F-XLMS algorithm with increased damping can be used to effectively control the structure Vibration; when the excitation frequency is greater than 1.41 times the natural frequency of the structure, the F-XLMS algorithm with reduced damping is used. To meet the requirements of different vibrations: For the forced vibration caused by the supporting foundation, when the structure resonates, increasing the damping can greatly reduce the amplitude of the structure; but under high-frequency excitation, increasing the damping will increase the amplitude of the structure. When the damping increase control is performed, the controller controls the actuator to cause a large strain in the damping material layer, and the greater the strain, the better; when the damping reduction control is performed, the controller controls the actuator to cause a smaller strain in the damping material layer strain, and the less strain the better.

The damping material layer adopts chlorinated butyl rubber, neoprene rubber and nitrile rubber. Polymer damping materials such as chloroprene rubber, nitrile rubber, and chlorinated butyl rubber are used as vibration-damping materials, which can prevent or reduce damage to equipment caused by mechanical vibration. Chlorinated butyl rubber damping material, because the butyl rubber molecular chain has many methyl groups, the elastic hysteresis is relatively large, so it has excellent damping performance, and after butyl rubber is chlorinated, the reactivity and adhesion performance are significantly improved. The damping material layer is pasted on the surface of the vibrating structure substrate, and the piezoelectric actuator layer is pasted above the damping material layer.

The piezoelectric actuator layer uses piezoelectric polymer polyvinylidene fluoride (PVDF) as the piezoelectric material. This material has a high piezoelectric constant and electromechanical coupling coefficient, so it has high sensitivity and frequency response characteristics. The piezoelectric actuator layer is pasted on the damping material layer, and the upper and lower sides of the piezoelectric actuator layer are respectively connected to the power amplifier through wires. The damping control system sends a control signal, and through the power amplifier, the piezoelectric actuator When an electric field is applied to the device layer, the piezoelectric material has an inverse piezoelectric effect, which drives the damping material layer to elongate or shorten together, causing it to undergo shear deformation. When the piezoelectric sensor is attached to the lower surface of the base panel of the bending vibration structure, the voltage signal sent by the damping control system is in the same phase as the sensor; when the piezoelectric sensor is attached to the upper surface of the base panel of the bending vibration structure, the voltage signal sent by the damping control system The signal is out of phase with the sensor, so that the polymer damping material layer obtains a large shear deformation, thereby improving the damping of the entire structure. Conversely, when the magnitude of the control signal makes the deformation of the voltage layer close to that of the sensor and in the same direction, the polymer damping material layer obtains the minimum shear deformation, thereby reducing the damping of the entire structure. Therefore, by adjusting the phase of the measuring element and the control signal and the amplitude of the control signal, the intelligent control of the damping can be realized.

The working principle of the utility model: for the piezoelectric material, when it is subjected to a force along a certain direction, it will not only produce mechanical deformation, but also be internally polarized, and there will be charges on the surface. When the external force is removed, it can return to the original uncharged state. state, this phenomenon is called piezoelectric effect. On the contrary, if an electric field is applied in the polarization direction of these materials, the electric field will increase the polarization intensity, that is, the distance between the positive and negative bound charges in the piezoelectric material will increase, and it will be mechanically deformed by the electric field force, That is to say, it is elongated or shortened in this direction. When the external electric field is removed, the deformation will disappear. This phenomenon is called the inverse piezoelectric effect. Due to the inverse piezoelectric effect of piezoelectric materials, the strain is proportional to the applied voltage. When the piezoelectric actuator layer is energized, an electric field will be generated at its two ends. By controlling the energized voltage, the electric field strength will be changed, so that the piezoelectric actuator layer will be elongated or shortened accordingly, and the damping material layer will be elongated together. Or shortened, because the change of the strain of the damping material layer will cause its damping size to change accordingly, that is, the shear strain of the damping material layer can be controlled by controlling the expansion and contraction of the piezoelectric actuator layer, so as to realize the controllability of the damping size , to achieve the purpose of controlling the damping size.

When the piezoelectric sensor is attached to the lower surface of the bending vibration structure substrate, the voltage signal sent by the damping control system is in the same phase as the sensor, and the larger the amplitude of the control signal, the better the effect; when the piezoelectric sensor is attached to the bending vibration structure substrate When the surface is on the surface, the voltage signal sent by the damping control system is out of phase with the sensor, and the greater the amplitude of the control signal, the better the effect, so that the polymer damping material layer obtains a larger shear deformation, thereby improving the damping of the entire structure. Conversely, when the magnitude of the control signal makes the deformation of the voltage layer close to the deformation of the sensor and in the same direction, the polymer damping material layer can obtain the minimum shear deformation, thereby reducing the damping of the entire structure. Therefore, by adjusting the phase of the measuring element and the control signal and the amplitude of the control signal, the intelligent control of the damping can be realized.

The polarization direction of the piezoelectric actuator layer of this device is the thickness direction, and the deformation direction is the length direction. When the upper side of the piezoelectric actuator layer is connected to the positive pole of the power supply and the lower side is connected to the negative pole, the positive voltage is applied, and the piezoelectric actuator layer On the contrary, when the upper side of the piezoelectric actuator layer is connected to the negative pole of the power supply and the lower side is connected to the positive pole, that is, the reverse voltage is applied, and the piezoelectric actuator layer shrinks.

When the vibrating substrate shrinks and deforms, if the piezoelectric actuator layer is supplied with a reverse voltage, the damping material layer is driven by the piezoelectric actuator layer and shrinks in the same direction as the vibrating structure substrate, and the damping material layer obtains a smaller shear. Deformation, at this time to reduce the damping situation, see Figure 4; if the piezoelectric actuator layer is connected to a forward voltage, the damping material layer is driven by the piezoelectric actuator layer and elongates in the opposite direction to the vibrating structure matrix, then the damping The material layer obtains a large shear deformation, and at this time, it is the case of increasing the damping, as shown in Figure 5.

When the base of the vibrating structure is elongated and deformed, if the piezoelectric actuator layer is supplied with a forward voltage, the damping material layer will elongate in the same direction as the vibrating structure base driven by the piezoelectric actuator layer, and the damping material layer will obtain a higher Small shear deformation, at this time, in order to reduce the damping situation, see Figure 6; if the piezoelectric actuator layer is connected to the reverse voltage, the damping material layer will shrink in the opposite direction to the vibrating structure matrix driven by the piezoelectric actuator layer, Then the damping material layer obtains a large shear deformation, and at this time, it is the situation of increasing the damping, as shown in Fig. 7 .

The utility model utilizes the above-mentioned principle. When the base structure vibrates, the damping control system uses the F-XLMS adaptive filtering algorithm to control the actuator layer to realize the controllability of the damping size of the device, and the intelligent control system of the mechanical structure damping size The structure of the mechanical structure damping size intelligent control system is shown in Figure 1, the principle of the mechanical structure damping size intelligent control system is shown in Figure 2, the mechanical structure damping size intelligent control system is shown in Figure 3, and the damping change principle of the mechanical structure damping size intelligent control system is shown in Figure 4, 5, 6, 7, the block diagram of adaptive filtering algorithm using F-XLMS is shown in Figure 8.

When the operating state of the mechanical system changes or the environment changes, the vibration state of the system structure changes. When the vibration state detected by the vibration sensor exceeds the vibration set value of the system, the sensor converts the vibration state information into an electrical signal, and passes through the charge amplifier. , divided into two channels, one as a feedback signal, which is sent to the DAQ board through the NI-PCI4472 board, and the other is sent to the computer of the damping control system. The computer compares the measured value with the control target value, and performs according to the control algorithm. The corresponding processing information is output, and then a control signal is sent to the power amplifier, and the output voltage is amplified through the power amplifier, so that the voltage loaded on the piezoelectric actuator layer changes. Due to the inverse piezoelectric effect of the piezoelectric material, the piezoelectric actuator The length of the actuator layer changes, and drives the damping material layer to expand and contract together, so as to achieve the purpose of controlling the damping size. The process in which the vibration sensor feeds back the vibration state information to the damping control system realizes the closed-loop control of damping. In this way, the intelligent control of the damping size of the entire mechanical structure is realized.

The system adopts the F-XLMS adaptive filter feedforward active control algorithm, that is, the system calculates the corresponding control correction amount according to the difference between the output signal and the expected value, and corrects the subsequent input signal, so that the output of the system gradually tends to the expected value. The adaptive filter feed-forward active control algorithm can continuously adjust its own parameters to make the output of the system automatically track the vibration signal, so that the complex and changeable external environmental interference can be suppressed in time, and its calculation amount is small, and the implementation process is mainly iterative calculation, which is beneficial It is beneficial for programming to realize its functions, and lightens the burden of the computer of the damping control system.

Although the specific implementation of the utility model has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the utility model. Those skilled in the art should understand that on the basis of the technical solution of the utility model, those skilled in the art do not need to Various modifications or deformations that can be made with creative efforts are still within the protection scope of the present utility model.

Claims (6)

1. A mechanical structure damping size intelligent control system is characterized in that the system includes a damping material layer, a piezoelectric actuator layer, a vibration sensor and a damping control system, and the bottom of the damping material layer and the vibration structure matrix Connection, the upper part is connected to the piezoelectric actuator layer, the vibration sensor is connected to the lower surface or upper surface of the vibration structure substrate, and the damping control system mainly includes a computer, NI-PCI4472 board, DAQ board, charge amplifier, power amplifier, and the vibration The sensor is connected to the NI-PCI4472 board through the charge amplifier, and the NI-PCI4472 board is connected to the piezoelectric actuator layer through the DAQ board and the power amplifier. the 2. The intelligent control system for mechanical structure damping according to claim 1, wherein the damping material layer is made of chlorinated butyl rubber, neoprene rubber, or nitrile rubber. the 3. The intelligent control system for mechanical structure damping according to claim 1, wherein the piezoelectric actuator layer uses piezoelectric polymer polyvinylidene fluoride as the piezoelectric material. the 4. The intelligent control system for mechanical structure damping according to claim 1, wherein the vibration sensor is a piezoelectric sensor. the 5. The intelligent control system for the damping size of the mechanical structure according to claim 1, wherein the damping control system adopts a damping control algorithm module, and the damping control algorithm module adopts F-XLMS adaptive filter feed-forward active control Algorithm module, the F-XLMS adaptive filter feedforward active control algorithm module includes a structural feature module, a filter parameter module, a comparator module, an LMS module, a first control channel feature module, and a second control channel feature module, wherein the structure The feature module is connected to the comparator module, the filter module is connected to the comparator module through the first control channel feature module, the comparator module is connected to the LMS module, the second control channel feature module is connected to the LMS module, and the LMS module is connected to the filter module . the 6. The intelligent control system of mechanical structure damping size as claimed in claim 5, is characterized in that, described NI-PCI4472 plate card is connected with Lab VIEW sound and vibration toolkit module. the

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