Active vibration isolation method based on noise reduction technology

Abstract

The invention relates to the technical field of active vibration isolation, in particular to an active vibration isolation method based on a noise reduction technology, which comprises the following steps: acquiring a noise signal of a steam turbine A in a steam turbine set in real time; determining the type of the noise signal based on the noise characteristic characterization parameter of the noise signal, and determining a strategy for generating an offset noise signal according to the noise intensity evaluation value of the corresponding noise signal type; determining moving strategies of different silencing layers of the vibration isolation box based on the noise counteracting characteristic evaluation value of the noise counteracting signal so as to output the noise counteracting signal to a steam turbine B adjacent to the steam turbine A; determining the eligibility of the offset noise signal based on the sound intensity values of the output offset noise signal and the steam turbine B noise signal; and under the condition that it is determined that the offset noise signal is unqualified, it is determined that gaps between different noise reduction layers are increased or pores of the same noise reduction layer are increased based on the difference value between the sound intensity value and the preset sound intensity value, and the vibration isolation efficiency of the steam turbine noise is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of active vibration isolation, and in particular to an active vibration isolation method based on noise reduction technology. Background Art

[0002] Noise reduction technology refers to the use of a series of specific methods or equipment to reduce or eliminate unwanted sounds, thereby improving sound quality. Active vibration isolation technology refers to the use of active control methods to isolate and reduce vibration transmission. Traditional vibration isolation methods mainly rely on passive vibration isolation. These methods have limited effects when dealing with high-frequency vibrations or complex vibration environments. With the development of technologies such as sensors, controllers, and actuators, active vibration isolation technology has gradually been applied. Active vibration isolation technology monitors vibration conditions in real time and makes real-time adjustments to reduce vibration transmission. It can more effectively deal with complex vibration environments such as power plant turbines and improve vibration isolation effects.

[0003] Chinese patent application publication number: CN103324799A discloses a method for active vibration isolation of angular vibration of the optical system of a full strapdown seeker, including introducing a ball joint connection between the optical system and the missile body, and making the center of mass of the optical system coincide with the center of the ball joint by design, so that the structural line vibration does not introduce coupled angular vibration; then by constructing a Sky-Hook damping model, the angular vibration response and angular vibration excitation become a classic Sky-Hook model, so that the appropriate spring stiffness and damping value can be selected according to the system's requirements for vibration isolation effect; finally, by actively controlling the angular vibration isolation of the angular vibration, the angular vibration response of the optical system under the angular vibration excitation can have good attitude reproducibility in the missile maneuvering frequency band, and can effectively isolate vibration in the noise vibration frequency band. However, the prior art has the following problems: the prior art does not perform fine processing on the noise of the turbine operating environment, resulting in high noise pollution during the operation of the turbine unit, thereby resulting in low vibration isolation efficiency for the turbine noise. Summary of the invention

[0004] To this end, the present invention provides an active vibration isolation method based on noise reduction technology to overcome the problem that the noise of the turbine operating environment is not finely processed in the prior art, resulting in high noise pollution during the operation of the turbine unit, thereby resulting in low vibration isolation efficiency for the turbine noise.

[0005] To achieve the above object, the present invention provides an active vibration isolation method based on noise reduction technology, comprising:

[0006] Several sensors are arranged on the vibration isolation box to obtain the noise signal of the steam turbine A in a steam turbine unit in real time;

[0007] Determining whether the noise signal is mechanical noise or airflow noise based on a noise characteristic characterization parameter of the noise signal, and determining a strategy for generating a noise cancellation signal according to a noise intensity evaluation value of the mechanical noise or airflow noise, wherein the strategy includes extracting important parameters of the noise signal to generate a noise cancellation signal, or extracting all parameters of the noise signal to generate a noise cancellation signal;

[0008] Determine a movement strategy of different sound-absorbing layers of the vibration isolation box based on the noise-absorbing characteristic evaluation value of the noise-absorbing signal to output the noise-absorbing signal to the steam turbine B adjacent to the steam turbine A, wherein the movement strategy includes moving different sound-absorbing layers to change the gaps between different sound-absorbing layers, or moving different sound-absorbing layers to change the gaps between different sound-absorbing layers and moving different sound-absorbing layers to change the pores of the same sound-absorbing layer;

[0009] Determining the eligibility of the cancelling noise signal based on the sound intensity values ​​of the cancelling noise signal and the noise signal of the turbine B after output;

[0010] Under the condition that the noise canceling signal is determined to be unqualified, it is determined based on the difference between the sound intensity value and the preset sound intensity value whether to increase the gap between different sound absorbing layers or to increase the pores in the same sound absorbing layer.

[0011] Further, under the condition of determining to obtain the noise signal, the noise signal is determined to be mechanical noise based on a comparison result that a noise characteristic characterization parameter of the noise signal is less than or equal to a noise characteristic characterization parameter threshold.

[0012] Further, under the condition of determining to obtain the noise signal, the noise signal is determined to be airflow noise based on a comparison result that a noise characteristic characterization parameter of the noise signal is greater than a noise characteristic characterization parameter threshold.

[0013] Further, under the condition of determining the type of the noise signal, based on the comparison result that the noise intensity evaluation value is less than or equal to the preset noise intensity evaluation value, it is determined to extract important parameters of the noise signal to generate a noise cancellation signal.

[0014] Further, under the condition of determining the type of the noise signal, based on the comparison result that the noise intensity evaluation value is greater than a preset noise intensity evaluation value, it is determined to extract all parameters of the noise signal to generate a noise cancellation signal.

[0015] Further, under the condition of determining a strategy for generating a noise cancellation signal, it is determined to move different silencing layers to change the gap between different silencing layers based on a comparison result that the noise cancellation feature evaluation value of the noise cancellation signal is less than or equal to a preset noise cancellation feature evaluation value.

[0016] Further, under the condition of determining a strategy for generating a noise cancellation signal, it is determined to move different sound-absorbing layers to change the gap between different sound-absorbing layers and to move different sound-absorbing layers to change the pores of the same sound-absorbing layer based on a comparison result that a noise cancellation feature evaluation value of the noise cancellation signal is greater than a preset noise cancellation feature evaluation value.

[0017] Further, under the condition of determining the moving strategy, the cancelling noise signal is determined to be unqualified based on the comparison result that the sound intensity value of the outputted cancelling noise signal and the noise signal of the turbine B is greater than the set sound intensity value.

[0018] Further, under the condition that the noise cancellation signal is determined to be unqualified, the gap between different sound-absorbing layers is increased by a preset gap adjustment coefficient according to a comparison result that the difference between the sound intensity value and the preset sound intensity value is less than or equal to the preset difference.

[0019] Further, under the condition that the noise cancellation signal is determined to be unqualified, the pores of the same sound-absorbing layer are increased by a preset pore adjustment coefficient according to a comparison result that the difference between the sound intensity value and the preset sound intensity value is greater than the preset difference.

[0020] Compared with the prior art, the beneficial effect of the present invention lies in that the present invention obtains the noise signal of turbine A in real time, determines the noise type according to the noise characteristic characterization parameter, and determines the strategy for generating a noise cancellation signal based on the noise intensity evaluation value, thereby improving the pertinence and efficiency of noise reduction, and adjusts the movement strategy of the sound-absorbing layer of the vibration isolation box based on the noise cancellation characteristic evaluation value of the noise cancellation signal to achieve effective output of the noise cancellation signal, evaluates the sound intensity value of the output noise cancellation signal and the noise signal of turbine B, determines the qualification of the noise cancellation signal, and ensures the quality of noise reduction. In the case that the noise cancellation signal is unqualified, the difference between the sound intensity value and the preset sound intensity value is used to adjust the structure of the noise cancellation layer, further optimize the structure of the noise cancellation layer, and improve the accuracy of noise reduction, thereby improving the vibration isolation efficiency of the turbine noise.

[0021] Furthermore, the present invention obtains the noise signal of turbine A in real time, determines the noise type according to the comparison between the noise characteristic characterization parameter and the noise characteristic characterization parameter threshold, and then determines the parameters extracted when generating the noise cancellation signal according to the comparison result between the noise intensity evaluation value and the preset noise intensity evaluation value, so as to accurately identify the noise type, improve the pertinence and efficiency of noise control, reduce the noise pollution during the operation of the turbine unit, and thus improve the vibration isolation efficiency of the turbine noise.

[0022] Furthermore, the present invention determines the movement strategy of different silencer layers of the vibration isolation box by comparing the noise cancellation characteristic evaluation value with the preset noise cancellation characteristic evaluation value, thereby improving the efficiency and accuracy of the noise cancellation signal, thereby reducing noise pollution and improving the vibration isolation efficiency of the turbine noise.

[0023] Furthermore, the present invention determines the eligibility of the noise cancellation signal by comparing the sound intensity values ​​of the output noise cancellation signal and the noise signal of turbine B with the preset sound intensity values, and determines the adjustment method of the vibration isolation box according to the difference between the sound intensity value and the preset sound intensity value in the unqualified case, accurately judges the eligibility of the noise cancellation signal, adjusts the vibration isolation box, and finely adjusts the structure of the vibration isolation box to improve the noise reduction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a flow chart of an active vibration isolation method based on noise reduction technology according to an embodiment of the present invention;

[0025] Figure 2 A side cross-sectional view of a device for an active vibration isolation method based on noise reduction technology according to an embodiment of the present invention;

[0026] Figure 3 This is a working schematic diagram of an active vibration isolation method based on noise reduction technology according to an embodiment of the present invention;

[0027] Figure 4 A flow chart for determining the type of a noise signal according to an embodiment of the present invention;

[0028] Figure 5 A flow chart for determining eligibility of a noise cancellation signal according to an embodiment of the present invention;

[0029] In the figure, 1. vibration isolation box; 2. sensor; 3. first sound-absorbing layer; 4. second sound-absorbing layer; 5. motor; 6. steam turbine A; 7. steam turbine B. DETAILED DESCRIPTION

[0030] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0032] It should be pointed out that the data in this embodiment are obtained by comprehensive analysis and evaluation of the historical test data and the corresponding historical test results of the present invention in the three months before this test. It can be understood by those skilled in the art that the present invention can determine the above parameters for a single item by selecting the highest proportion of values ​​as the preset standard parameters according to the data distribution, using weighted summation to use the obtained values ​​as the preset standard parameters, substituting each historical data into a specific formula and using the values ​​obtained by the formula as the preset standard parameters or other selection methods, as long as the present invention can clearly define different specific situations in the single determination process through the obtained values.

[0033] See also Figure 1-Figure 5 As shown, Figure 1 This is a flow chart of an active vibration isolation method based on noise reduction technology according to an embodiment of the present invention; Figure 2 A side cross-sectional view of a device for an active vibration isolation method based on noise reduction technology according to an embodiment of the present invention; Figure 3 This is a working schematic diagram of an active vibration isolation method based on noise reduction technology according to an embodiment of the present invention; Figure 4 A flow chart for determining the type of a noise signal according to an embodiment of the present invention; Figure 5 A flow chart of determining eligibility of a noise cancellation signal according to an embodiment of the present invention.

[0034] The active vibration isolation method based on the noise reduction technology of the embodiment of the present invention includes:

[0035] Step S1, a plurality of sensors are arranged on the vibration isolation box to obtain the noise signal of the steam turbine A in a group of steam turbine units in real time;

[0036] Step S2, determining that the noise signal is mechanical noise or airflow noise based on the noise characteristic characterization parameter of the noise signal, and determining a strategy for generating a noise cancellation signal according to the noise intensity evaluation value of the mechanical noise or airflow noise, wherein the strategy includes extracting important parameters of the noise signal to generate a noise cancellation signal, or extracting all parameters of the noise signal to generate a noise cancellation signal;

[0037] Step S3, based on the noise cancellation feature evaluation value of the noise cancellation signal, determining a movement strategy of different sound-absorbing layers of the vibration isolation box to output the noise cancellation signal to the steam turbine B adjacent to the steam turbine A, wherein the movement strategy includes moving different sound-absorbing layers to change the gaps between different sound-absorbing layers, or moving different sound-absorbing layers to change the gaps between different sound-absorbing layers and moving different sound-absorbing layers to change the pores of the same sound-absorbing layer;

[0038] Step S4, determining the eligibility of the cancelling noise signal based on the sound intensity values ​​of the cancelling noise signal and the noise signal of the steam turbine B after being output;

[0039] Step S5: under the condition that it is determined that the noise canceling signal is unqualified, determining whether to increase the gap between different sound-absorbing layers or to increase the pores in the same sound-absorbing layer based on the difference between the sound intensity value and the preset sound intensity value.

[0040] The active vibration isolation method based on the noise reduction technology of the embodiment of the present invention is implemented by the following device, which includes:

[0041] The vibration isolation box 1 comprises a first sound-absorbing layer 3 arranged on one side of the vibration isolation box 1 , a second sound-absorbing layer 4 arranged on the other side of the vibration isolation box 1 , and sensors 2 arranged on both sides of the outside of the vibration isolation box 1 .

[0042] In the embodiment of the present invention, the sensor includes a sound sensor, a vibration sensor, etc. for acquiring noise information.

[0043] In the embodiment of the present invention, the vibration isolation box includes a first sound-absorbing layer and a second sound-absorbing layer, the first sound-absorbing layer is a phononic crystal layer, and the second sound-absorbing layer is a carbon fiber layer.

[0044] Specifically, the present invention obtains the noise signal of turbine A in real time, determines the noise type according to the noise characteristic characterization parameter, and determines the strategy for generating a noise cancellation signal based on the noise intensity evaluation value, thereby improving the pertinence and efficiency of noise reduction, and adjusts the movement strategy of the sound-absorbing layer of the vibration isolation box based on the noise cancellation characteristic evaluation value of the noise cancellation signal to achieve effective output of the noise cancellation signal, evaluates the sound intensity value of the output noise cancellation signal and the noise signal of turbine B, determines the qualification of the noise cancellation signal, and ensures the quality of noise reduction. In the case that the noise cancellation signal is unqualified, the difference between the sound intensity value and the preset sound intensity value is used to adjust the structure of the noise cancellation layer, further optimize the structure of the noise cancellation layer, and improve the accuracy of noise reduction, thereby improving the vibration isolation efficiency of the turbine noise.

[0045] Specifically, under the condition of obtaining the noise signal of the steam turbine A in a group of steam turbine units in real time, the embodiment of the present invention determines the type of the noise signal according to the comparison result of the noise characteristic characterization parameter of the noise signal and the noise characteristic characterization parameter threshold value 0.88;

[0046] When the noise characteristic characterization parameter is less than or equal to the noise characteristic characterization parameter threshold, it is determined that the noise signal is mechanical noise;

[0047] When the noise characteristic characterization parameter is greater than the noise characteristic characterization parameter threshold, it is determined that the noise signal is airflow noise.

[0048] In the embodiment of the present invention, the noise characteristic characterization parameter threshold value is 0.88, but the above value is not limited thereto, and those skilled in the art may also adjust the value according to actual needs.

[0049] In the embodiment of the present invention, the mechanical noise is generated by vibration or friction of mechanical parts of the steam turbine, and the airflow noise is generated by the flow of gas inside the steam turbine.

[0050] Specifically, the embodiment of the present invention calculates the noise characteristic parameter according to the following formula, and sets:

[0051]

[0052] Where P represents the noise characteristic parameter, fmax is the maximum frequency of the noise signal, and fmin is the minimum frequency of the noise signal. is the average frequency of the noise signal, hmax is the maximum amplitude of the noise signal, hmin is the minimum amplitude of the noise signal, is the average value of the noise signal amplitude.

[0053] Specifically, under the condition of determining the type of the noise signal, the embodiment of the present invention determines the strategy for generating a noise cancellation signal according to the comparison result of the noise intensity evaluation value of the corresponding noise signal type and the preset noise intensity evaluation value 0.83;

[0054] When the noise intensity evaluation value is less than or equal to the preset noise intensity evaluation value, determining to extract important parameters of the noise signal to generate a noise cancellation signal;

[0055] When the noise intensity evaluation value is greater than the preset noise intensity evaluation value, it is determined to extract all parameters of the noise signal to generate a noise cancellation signal.

[0056] In the embodiment of the present invention, the preset noise intensity evaluation value is 0.83, but the above value is not limited thereto, and those skilled in the art may also adjust the value according to actual needs.

[0057] Specifically, the embodiment of the present invention calculates the noise intensity evaluation value according to the following formula, setting:

[0058]

[0059] Among them, Q represents the noise intensity evaluation value, L is the sound pressure under the turbine operating environment, L0 is the sound pressure threshold, and L0 is set to 50dB, B is the average value of the frequency range covered by the noise under the turbine operating environment, B0 is the frequency range average value threshold, and B0 is set to 10000Hz.

[0060] Specifically, the present invention obtains the noise signal of turbine A in real time, determines the noise type according to the comparison between the noise characteristic characterization parameter and the noise characteristic characterization parameter threshold, and then determines the parameters extracted when generating the noise cancellation signal according to the comparison result between the noise intensity evaluation value and the preset noise intensity evaluation value, so as to accurately identify the noise type, improve the pertinence and efficiency of noise control, reduce the noise pollution during the operation of the turbine unit, and thus improve the vibration isolation efficiency of the turbine noise.

[0061] Specifically, under the condition of determining the strategy for generating a noise cancellation signal, the embodiment of the present invention determines the movement strategy of different silencing layers of the vibration isolation box according to the comparison result of the noise cancellation feature evaluation value of the noise cancellation signal and the preset noise cancellation feature evaluation value 0.75;

[0062] When the noise canceling characteristic evaluation value is less than or equal to the preset noise canceling characteristic evaluation value, it is determined to move different sound-absorbing layers to change the gap between different sound-absorbing layers, and the gap has a value range of 0 mm-30 mm, preferably 10 mm;

[0063] When the noise cancellation characteristic evaluation value is greater than the preset noise cancellation characteristic evaluation value, it is determined to move different sound-absorbing layers to change the gap between different sound-absorbing layers and at the same time move different sound-absorbing layers to change the pores of the same sound-absorbing layer. The pores of the first sound-absorbing layer range from 0.1mm to 1.5mm, preferably 1.0mm, and the pores of the second sound-absorbing layer range from 0.5mm to 2.0mm, preferably 1.2mm.

[0064] In the embodiment of the present invention, the preset noise cancellation characteristic evaluation value is 0.75, but the above value is not limited thereto, and those skilled in the art may also adjust the value according to actual needs.

[0065] In the embodiment of the present invention, the value range of the gap is the distance range between the first sound-absorbing layer and the second sound-absorbing layer that pass the vibration isolation test; the pore range of the first sound-absorbing layer is the pore range of the first sound-absorbing layer that pass the vibration isolation test; and the pore range of the second sound-absorbing layer is the pore range of the second sound-absorbing layer that pass the vibration isolation test.

[0066] Specifically, the noise cancellation feature evaluation value is the ratio of the difference between the maximum frequency and the minimum frequency of the noise cancellation to the average frequency multiplied by the ratio of the difference between the maximum amplitude and the minimum amplitude of the noise cancellation to the average amplitude.

[0067] Specifically, the present invention determines the movement strategy of different silencer layers of the vibration isolation box by comparing the noise cancellation characteristic evaluation value with the preset noise cancellation characteristic evaluation value, thereby improving the efficiency and accuracy of the noise cancellation signal, thereby reducing noise pollution and improving the vibration isolation efficiency of the turbine noise.

[0068] Specifically, under the condition of determining the moving strategy, the embodiment of the present invention determines the eligibility of the cancelling noise signal according to the comparison result of the sound intensity value of the cancelling noise signal and the noise signal of the turbine B after output and the preset sound intensity value of 80dB;

[0069] When the sound intensity value is less than or equal to the preset sound intensity value, it is determined that the noise cancellation signal is qualified;

[0070] When the sound intensity value is greater than the preset sound intensity value, it is determined that the noise cancellation signal is unqualified.

[0071] In the embodiment of the present invention, the preset sound intensity value is 80dB. The preset sound intensity is obtained by taking the average of several historical sound intensity values ​​that are qualified for canceling noise signals. However, the above value is not limited to this. Those skilled in the art can also adjust the value according to actual needs.

[0072] Specifically, the sound intensity value is measured by a plurality of sensors on the vibration isolation box.

[0073] Specifically, under the condition that the noise cancellation signal is determined to be unqualified, the embodiment of the present invention determines the adjustment method of the vibration isolation box according to the comparison result of the difference between the sound intensity value and the preset sound intensity value and the preset difference value 0.52;

[0074] When the difference is less than or equal to the preset difference, it is determined to increase the gap between different sound-absorbing layers to a corresponding value by a preset gap adjustment coefficient of 1.05;

[0075] When the difference is greater than the preset difference, it is determined that the pores of the same sound-absorbing layer are increased to a corresponding value by using a preset pore adjustment coefficient of 1.12;

[0076] The difference is the difference between the sound intensity value and the preset sound intensity value.

[0077] In the embodiment of the present invention, the preset difference value is 0.52, but the above value is not limited thereto, and those skilled in the art may also adjust the value according to actual needs.

[0078] In an embodiment of the present invention, the increased gap is the product of the gap between different sound-absorbing layers and the preset gap adjustment coefficient of 1.05, the increased pores of the first sound-absorbing layer are the product of the pores of the first sound-absorbing layer and the preset pore adjustment coefficient of 1.12, and the increased pores of the second sound-absorbing layer are the product of the pores of the second sound-absorbing layer and the preset pore adjustment coefficient of 1.12.

[0079] Specifically, the present invention determines the eligibility of the noise cancellation signal by comparing the sound intensity values ​​of the output noise cancellation signal and the noise signal of turbine B with the preset sound intensity values, and determines the adjustment method of the vibration isolation box according to the difference between the sound intensity value and the preset sound intensity value in the unqualified case, accurately judges the eligibility of the noise cancellation signal, adjusts the vibration isolation box, and finely adjusts the structure of the vibration isolation box to improve the noise reduction efficiency.

[0080] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An active vibration isolation method based on noise reduction technology, characterized in that: include: A plurality of sensors are arranged on the vibration isolation box to obtain the noise signal of the steam turbine A in a group of steam turbine units in real time; Determining whether the noise signal is mechanical noise or airflow noise based on a noise characteristic characterization parameter of the noise signal, and determining a strategy for generating a noise cancellation signal according to a noise intensity evaluation value of the mechanical noise or airflow noise, wherein the strategy includes extracting important parameters of the noise signal to generate a noise cancellation signal, or extracting all parameters of the noise signal to generate a noise cancellation signal; Determine a movement strategy of different sound-absorbing layers of the vibration isolation box based on the noise-absorbing characteristic evaluation value of the noise-absorbing signal to output the noise-absorbing signal to the steam turbine B adjacent to the steam turbine A, wherein the movement strategy includes moving different sound-absorbing layers to change the gaps between different sound-absorbing layers, or moving different sound-absorbing layers to change the gaps between different sound-absorbing layers and moving different sound-absorbing layers to change the pores of the same sound-absorbing layer; Determining the eligibility of the cancelling noise signal based on the sound intensity values ​​of the cancelling noise signal and the noise signal of the turbine B after output; Under the condition that the noise canceling signal is determined to be unqualified, it is determined based on the difference between the sound intensity value and the preset sound intensity value whether to increase the gap between different sound absorbing layers or to increase the pores in the same sound absorbing layer.

2. The active vibration isolation method based on noise reduction technology according to claim 1 is characterized in that: Under the condition of determining to obtain the noise signal, the noise signal is determined to be mechanical noise based on a comparison result that a noise characteristic characterization parameter of the noise signal is less than or equal to a noise characteristic characterization parameter threshold.

3. The active vibration isolation method based on noise reduction technology according to claim 1 is characterized in that: Under the condition of determining that the noise signal is acquired, the noise signal is determined to be airflow noise based on a comparison result that a noise characteristic characterization parameter of the noise signal is greater than a noise characteristic characterization parameter threshold.

4. The active vibration isolation method based on noise reduction technology according to claim 2 or 3, characterized in that: Under the condition of determining the type of the noise signal, based on the comparison result that the noise intensity evaluation value is less than or equal to the preset noise intensity evaluation value, it is determined to extract important parameters of the noise signal to generate a noise cancellation signal.

5. The active vibration isolation method based on noise reduction technology according to claim 2 or 3, characterized in that: Under the condition of determining the type of the noise signal, based on the comparison result that the noise intensity evaluation value is greater than the preset noise intensity evaluation value, it is determined to extract all parameters of the noise signal to generate a noise cancellation signal.

6. The active vibration isolation method based on noise reduction technology according to claim 1 is characterized in that: Under the condition of determining a strategy for generating a noise cancelling signal, it is determined to move different noise cancelling layers to change the gaps between the different noise cancelling layers based on a comparison result that a noise cancelling feature evaluation value of the noise cancelling signal is less than or equal to a preset noise cancelling feature evaluation value.

7. The active vibration isolation method based on noise reduction technology according to claim 1 is characterized in that: Under the condition of determining a strategy for generating a noise cancellation signal, it is determined to move different sound-absorbing layers to change the gap between different sound-absorbing layers and to move different sound-absorbing layers to change the pores of the same sound-absorbing layer based on a comparison result that a noise cancellation feature evaluation value of the noise cancellation signal is greater than a preset noise cancellation feature evaluation value.

8. The active vibration isolation method based on noise reduction technology according to claim 1, characterized in that: Under the condition of determining the moving strategy, the cancelling noise signal is determined to be unqualified based on the comparison result that the sound intensity value of the outputted cancelling noise signal and the noise signal of the turbine B is greater than the set sound intensity value.

9. The active vibration isolation method based on noise reduction technology according to claim 8, characterized in that: Under the condition that the noise cancellation signal is determined to be unqualified, the preset gap adjustment coefficient is used to increase the gap between different sound-absorbing layers according to the comparison result that the difference between the sound intensity value and the preset sound intensity value is less than or equal to the preset difference.

10. The active vibration isolation method based on noise reduction technology according to claim 8, characterized in that: Under the condition that the noise cancellation signal is determined to be unqualified, the pores of the same sound-absorbing layer are increased by a preset pore adjustment coefficient according to a comparison result that the difference between the sound intensity value and the preset sound intensity value is greater than the preset difference.

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