Pipeline noise reduction system and method based on active frequency modulation

Abstract

The invention discloses a pipeline noise reduction system and method based on active frequency modulation. The pipeline noise reduction system comprises a sound wave detector, an electromagnetic adjusting device and a noise reduction device. Wherein the sound wave detector is mounted on the outer wall of the pipeline and is used for detecting noise signals; the electromagnetic adjusting device is used for releasing a corresponding electromagnetic signal to the noise reduction device according to the detected noise signal; and the noise reduction device is used for adaptively adjusting the vibration frequency according to the electromagnetic signal, so that resonance between the adjusted vibration frequency and the noise frequency is realized, the sound energy is absorbed to the greatest extent, and the noise reduction efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of environmental protection technology, and in particular to a pipeline noise reduction system and method based on active frequency modulation. Background Art

[0002] As pipeline transportation is widely used in industrial, agricultural and residential environments, pipeline noise has gradually attracted the attention of people from all walks of life. When the noise decibel reaches 70dB, people will feel noisy, and long-term exposure to a noise environment exceeding 80dB will cause permanent damage to human hearing.

[0003] In response to the pipeline noise problem, researchers at home and abroad have designed and invented sound-absorbing and sound-isolating structures and systems to reduce it, and have achieved certain results in controlling high-frequency noise. However, due to the limitations of the sound-absorbing and sound-isolating principle itself, the control effect of the currently designed sound-absorbing and sound-isolating structures and systems on low-frequency noise is still very limited.

[0004] At present, the pipeline noise reduction systems at home and abroad mainly use the method of wrapping specific sound-absorbing materials and structures on the surface of the pipeline to reduce the noise generated by the pipeline. Once this type of method is installed, the sound absorption frequency band and the optimal operating point are fixed, and the equipment maintenance and replacement are extremely difficult. In addition, the main noise frequency in the pipeline noise environment is often in dynamic change, and the noise reduction effect of the sound absorption structure with a fixed optimal sound absorption frequency band is not ideal. Therefore, it is particularly important for the pipeline sound absorption system to perceive the noise frequency of the exposed environment, provide timely feedback, and absorb the noise in a specific frequency band in a targeted manner.

[0005] A Chinese patent (publication number CN 112002300 A) discloses a broadband resonant sound absorption method and structure. This patent uses two or more resonant sound absorption units with different cavity depths to form a sound absorption module in parallel, so as to broaden the frequency of sound absorption. Each resonant sound absorption unit with a cavity depth can produce an acoustic impedance and sound absorption coefficient curve of a specific resonant frequency; when a plurality of resonant sound absorption units with different cavity depths are combined into a sound absorption module, a plurality of sound absorption coefficient curves with different resonant frequencies are coupled and superimposed, thereby realizing a broadband sound absorption coefficient curve. This patent achieves the broadening of the sound absorption frequency to a certain extent, but the adjustment of the sound absorption frequency band must be disassembled and installed again. Once installed and fixed, the sound absorption coefficient can only change passively with the loss of the sound absorption structure, and the sound absorption performance cannot be controlled. Therefore, the sound absorption effect is not ideal, which is not conducive to long-term use.

[0006] A Chinese patent (publication number CN 113393827 A) discloses an active / passive controlled Helmholtz resonator that changes the sound absorption frequency. The resonator adopts the method of adding a heating rod to the resonance cavity, and changes the sound absorption coefficient of the structure by manually identifying the noise source and manually changing the power of the heating rod, thereby achieving the purpose of controllably changing the sound absorption performance of the resonator. The invention preliminarily explores a method for actively controlling the sound absorption performance of the sound absorber. However, this method cannot rely on the noise reduction system to identify the noise environment and spontaneously adjust the sound absorption performance. In addition, this method uses a heating rod to adjust the sound absorption performance, and the adjustment speed is relatively slow, making it difficult to perform sound absorption treatment for variable frequency noise.

[0007] In summary, the main problems of the current pipeline noise reduction system are as follows:

[0008] 1. The control effect of low-frequency noise is poor;

[0009] 2. The sound absorption and insulation structure and system are fixed and difficult to disassemble for maintenance;

[0010] 3. The current sound-absorbing and sound-insulating structures and systems have fixed sound-absorbing and sound-insulating frequency bands, and cannot rely on instruments to autonomously identify noise sources and quickly adjust the sound-absorbing and sound-insulating structures and systems to achieve the optimal sound-absorbing and sound-insulating frequency bands to achieve targeted noise reduction. Summary of the invention

[0011] In view of the technical problem of low pipeline noise reduction efficiency in the prior art, the present invention discloses a pipeline noise reduction system and method based on active frequency modulation, which identifies the source of noise and electromagnetically regulates the noise so that the frequency of the noise and the frequency of the noise reduction device resonate, thereby achieving maximum noise reduction and improving the efficiency of noise reduction.

[0012] In order to achieve the above object, the present invention provides the following technical solutions:

[0013] A pipeline noise reduction system based on active frequency modulation includes an acoustic wave detector, an electromagnetic adjustment device, and a noise reduction device; wherein:

[0014] An acoustic wave detector, installed on the outer wall of the pipeline, is used to detect noise signals;

[0015] An electromagnetic regulating device, used for releasing a corresponding electromagnetic signal to the noise reduction device according to the detected noise signal;

[0016] The noise reduction device is used to adaptively adjust the vibration frequency according to the electromagnetic signal so that the adjusted vibration frequency is consistent with the noise frequency to achieve resonance noise reduction.

[0017] Preferably, the noise reduction device includes a sound absorption module, a sound insulation module and a disassembly module; wherein the sound absorption module is used to adaptively adjust the vibration frequency according to the electromagnetic signal sent by the electromagnetic adjustment device, so that the adjusted vibration frequency resonates with the frequency of the noise, thereby absorbing the sound and achieving the first noise reduction; the sound insulation module is used to reflect and absorb the sound after the first noise reduction to achieve the second noise reduction; the disassembly module is used to fix the noise reduction device.

[0018] Preferably, the sound absorption module includes a rigid outer wall 1, a magnetostrictive resonance thin plate 7 and an excitation coil 13; the magnetostrictive resonance thin plate 7 is arranged on the periphery of the pipe outer wall 2, and a sound absorption cavity 5 is present between the two; the outer side of the magnetostrictive resonance thin plate 7 is provided with keels 10 evenly distributed along the circumference, and the other end of the keel 10 is provided with a rigid outer wall 1, and a vibration reduction cavity 6 is formed between the rigid outer wall 1 and the magnetostrictive resonance thin plate 7; an excitation coil 13 is placed on the outer side of the rigid outer wall 1.

[0019] Preferably, the diameter of the excitation coil 13 is greater than the diameter of the rigid outer wall 1 , the diameter of the magnetostrictive resonance thin plate 7 is greater than the diameter of the pipe outer wall 2 .

[0020] Preferably, the vibration-damping cavity 6 is filled with a vibration-damping material; and the magnetostrictive resonance plate 7 is made of a magnetostrictive material.

[0021] Preferably, the sound insulation module comprises a rigid sound insulation wall 8 ; the rigid sound insulation wall 8 is placed outside the excitation coil 13 , and a sound insulation cavity 4 is formed therebetween.

[0022] Preferably, the sound insulation cavity 4 is filled with sound insulation material.

[0023] Preferably, an error sensor 12 is provided in the sound insulation cavity 4 .

[0024] Preferably, the electromagnetic regulation module includes a controller 15, a first signal input line 16, an electromagnetic signal output line 14 and a second signal input line 17;

[0025] The input end of the first signal input line 16 is connected to the output end of the acoustic wave detector 9, the output end of the first signal input line 16 is connected to the first input end of the controller 15, the output end of the controller 15 is connected to the input end of the electromagnetic signal output line 14, and the output end of the electromagnetic signal output line 14 is connected to the excitation coil 13; the input end of the second signal input line 17 is connected to the output end of the error sensor 12, and the output end of the second signal input line 17 is connected to the second input end of the controller 15.

[0026] The present invention also provides a pipeline noise reduction method based on active frequency modulation, which specifically includes the following steps:

[0027] S1: Obtain a noise signal of a pipeline and perform preprocessing to obtain a first input signal;

[0028] S2: The controller outputs an electromagnetic signal to the sound absorption module according to the first input signal;

[0029] S3: The sound absorption module adaptively adjusts the vibration frequency according to the electromagnetic signal to make the vibration frequency consistent with the noise frequency, thus achieving resonance noise reduction and thus performing the first noise reduction;

[0030] S4: The sound insulation module insulates the noise after the first noise reduction to achieve a second noise reduction.

[0031] In summary, due to the adoption of the above technical solution, compared with the prior art, the present invention has at least the following beneficial effects:

[0032] The present invention firstly captures the noise through an acoustic wave detector, and then releases an electromagnetic signal to the sound absorption module of the noise reduction device according to the frequency of the noise (the frequency with the maximum equivalent sound pressure level), thereby changing the surface density of the magnetostrictive resonance plate in the sound absorption module, and then making the resonance frequency of the sound absorption module consistent with the frequency band with the maximum equivalent sound level of the noise, the bending deformation of the sound absorption module is the largest, the vibration is the most violent, and the sound energy consumption is also the largest, thereby achieving the first noise reduction;

[0033] The noise that has undergone the first noise reduction will then pass through the outer sound insulation module, where part of the sound energy will be reflected, part will be absorbed, and part of the sound energy will pass through the sound insulation module. In addition, the reflected sound energy can be further absorbed by the sound absorption module, thereby minimizing the effect of noise spillover and achieving a second noise reduction. Description of the drawings:

[0034] Figure 1 Schematic diagram of a pipeline noise reduction system based on active frequency modulation according to an exemplary embodiment of the present invention.

[0035] Figure 2 Schematic diagram of the longitudinal section structure of a noise reduction device according to an exemplary embodiment of the present invention.

[0036] Figure 3 Schematic diagram of the structure of an electromagnetic regulating device according to an exemplary embodiment of the present invention.

[0037] Figure 4 The figure is a schematic diagram of a pipeline noise reduction method based on active frequency modulation according to an exemplary embodiment of the present invention.

[0038] Figure 5 FIG. 4 is a schematic diagram showing the relationship between the magnetostriction coefficient λ and the magnetic field intensity H according to an exemplary embodiment of the present invention.

[0039] 1-rigid outer wall, 2-outer wall of pipe, 3-fluid in pipe, 4-sound insulation cavity, 5-sound absorption cavity, 6-vibration reduction cavity, 7-magnetostrictive resonance thin plate, 8-rigid sound insulation wall, 9-sound wave detector, 10-keel, 11-installation valve, 12-error sensor, 13-excitation coil, 14-electromagnetic signal output line, 15-controller, 16-first signal input line, 17-second signal input line. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with the examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following examples, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0041] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] like Figure 1 As shown, the present invention provides a pipeline noise reduction system based on active frequency modulation, which can be used for pipeline noise reduction, and includes an acoustic wave detector, an electromagnetic adjustment device, and a noise reduction device.

[0043] Acoustic wave detector, installed on the outer wall of the pipeline, used to detect noise;

[0044] An electromagnetic regulating device, used for releasing a corresponding electromagnetic signal to the noise reduction device according to the detected noise;

[0045] The noise reduction device is used to adaptively adjust the vibration frequency according to the electromagnetic signal, so that the adjusted vibration frequency is consistent with the frequency of the noise, to achieve resonance noise reduction, thereby absorbing and isolating the noise, outputting the noise-reduced sound, and thus reducing the impact of the noise on the outside world.

[0046] like Figure 2 As shown, the noise reduction device includes a sound absorption module, a sound insulation module and a disassembly module. The sound absorption module is used to adaptively adjust the vibration frequency according to the electromagnetic signal sent by the electromagnetic adjustment device, so that the adjusted vibration frequency is consistent with the frequency of the noise, thereby achieving resonance noise reduction, thereby absorbing the sound and achieving the first noise reduction; the sound insulation module is used to reflect and absorb the sound after the first noise reduction, achieve the second noise reduction, and further reduce the impact of the sound on the outside world; the disassembly module is used to fix the noise reduction device.

[0047] In this embodiment, the sound absorption module includes a rigid outer wall 1, a magnetostrictive resonance thin plate 7 (magnetostrictive materials such as Tb-Dy-Fe can be used) and an excitation coil 13. The magnetostrictive resonance thin plate 7 is arranged around the outer wall 2 of the pipeline, and there is a sound absorption cavity 5 between the two (the diameter of the magnetostrictive resonance thin plate 7 is larger than the diameter of the pipeline), and a sound wave detector 9 is installed in the sound absorption cavity 5; the outer side of the magnetostrictive resonance thin plate 7 is provided with keels 10 evenly arranged along the circumference, and the other end of the keel 10 is provided with a rigid outer wall 1, and a vibration reduction cavity 6 is formed between the rigid outer wall 1 and the magnetostrictive resonance thin plate 7 (the diameter of the rigid outer wall 1 is larger than the diameter of the magnetostrictive resonance thin plate 7), and the vibration reduction cavity 6 is filled with a shock absorbing material, such as air or cotton. An excitation coil 13 is arranged on the outside of the rigid outer wall 1 (the diameter of the rigid outer wall 1 is larger than the diameter of the excitation coil 13). The excitation coil 13 receives the electromagnetic signal sent by the electromagnetic adjustment device to generate a magnetic field, which then acts on the magnetostrictive resonance plate 7 to change the vibration frequency of the magnetostrictive resonance plate 7.

[0048] In this embodiment, the working principle of the sound absorption module is as follows:

[0049] The magnetostrictive resonance thin plate 7 is made of magnetostrictive materials such as Tb-Dy-Fe, and can be adaptively and actively adjusted in vibration frequency according to electromagnetic signals; when sound waves are incident on the magnetostrictive resonance thin plate 7 to cause the plate surface to vibrate, the vibration of the thin plate 7 must overcome its own damping and the friction between the plate and the keel 10, so that part of the sound energy is converted into heat energy and lost, especially when the damping of the edge is large, the consumption of sound energy is greater; when the thin plate 7 is stimulated by the electromagnetic signal, its surface density changes, and the corresponding vibration frequency will also change accordingly. When the vibration frequency is consistent with the frequency of the incident sound wave (which can be understood as close), resonance will occur. At this time, the bending deformation of the thin plate 7 is the largest, the vibration is the most violent, and the sound energy consumption is also the largest, converting the sound energy into mechanical energy, and through 6-vibration-damping filling and 10-keel, the mechanical energy is further converted into heat energy and released into the environment; the vibration frequency calculation formula of the magnetostrictive resonance thin plate 7 is:

[0050]

[0051] In formula (1), f 0 It represents the vibration frequency of the magnetostrictive resonance thin plate; M represents the surface density of the magnetostrictive resonance thin plate, the unit is: Kg / m 2 ; M = mt, m is the board density, unit: Kg / m 3 ; t is the plate thickness, unit: m; D represents the thickness of the air layer behind the magnetostrictive resonance plate.

[0052] In this embodiment, the sound insulation module includes a rigid sound insulation wall 8, which is wrapped around the periphery of the sound absorption module. The diameter of the rigid sound insulation wall 8 is larger than the coil of the excitation coil 13, and a sound insulation cavity 4 is formed between the two. The sound insulation cavity 4 is filled with sound insulation material, such as polyester fiber sound insulation material.

[0053] In this embodiment, an error sensor 12 is installed in the sound insulation cavity 4. The error sensor 12 is used to input the sound after the first noise reduction into the electromagnetic adjustment device. The electromagnetic adjustment device uses an optimization algorithm to optimize the output electromagnetic signal, so that the vibration frequency of the magnetostrictive resonance plate 7 is closer to the frequency of the noise, the energy consumption of the sound is greater, and the noise reduction effect is improved.

[0054] In this embodiment, the method for the electromagnetic regulating device to optimize the electromagnetic signal is:

[0055] The original first input signal is obtained by the acoustic wave detector 9, and the electromagnetic regulating device analyzes and generates a corresponding electromagnetic signal for frequency modulation noise reduction. At the same time, the expected signal of the expected noise reduction effect is obtained by the first input signal and the electrical signal in the electromagnetic regulating device. The sound after the first noise reduction is detected by the error sensor, and the expected signal is analyzed with the sound after the first noise reduction. If it is found that the noise reduction frequency is higher / lower than the set value corresponding to the expected signal, the magnetic field strength is enhanced / weakened for feedback.

[0056] The working principle of the sound insulation module is:

[0057] After the first noise reduction, the sound reaches the sound insulation cavity 4 and is blocked by the sound insulation material therein, further reducing the pollution caused by noise spillover; when the sound after passing through the sound insulation material reaches the rigid sound insulation wall 8, sound reflection and absorption will also occur, once again reducing the impact of noise on the outside world.

[0058] In this embodiment, the disassembly module 11 includes an installation valve, which is composed of a row of buckles that can be opened and closed flexibly (all equipment is divided into two parts, upper and lower, with a vibration-damping sealing layer in the middle for sound sealing). After the installation is completed, the row of buckles is closed, and the system can work normally; when the system or pipeline needs to be repaired, the row of buckles is opened to open the sound absorption and insulation system to complete the repair work.

[0059] like Figure 3 As shown, the electromagnetic regulation module includes a controller 15 (installed in a base station), a first signal input line 16 , an electromagnetic signal output line 14 , and a second signal input line 17 .

[0060] The input end of the first signal input line 16 is connected to the output end of the acoustic wave detector 9, the output end of the first signal input line 16 is connected to the first input end of the controller 15, the output end of the controller 15 is connected to the input end of the electromagnetic signal output line 14, and the output end of the electromagnetic signal output line 14 is connected to the excitation coil 13; the input end of the second signal input line 17 is connected to the output end of the error sensor 12, and the output end of the second signal input line 17 is connected to the second input end of the controller 15.

[0061] The working principle of the electromagnetic regulation module is:

[0062] The fluid 3 in the pipe generates noise during the flow of the pipe, and propagates to the outside through the outer wall 2 of the pipe. The frequency and energy of the noise are detected by the acoustic wave detector 9 in the sound-absorbing cavity 5, and transmitted to the controller 15 in the form of an electrical signal through the first signal input line 16. The controller 15 releases a matching electromagnetic signal through the corresponding specific gravity program set, and transmits it to the excitation coil 13 through the electromagnetic signal output line 14 to generate a magnetic field, and applies the magnetic field to the magnetostrictive resonance plate 7. The magnetostrictive resonance plate 7 is stimulated by the magnetic field, and its surface density changes (the magnetostrictive material is the innovation of the present invention, and its characteristic is that the material will stretch or shrink accordingly as the intensity of the magnetic field it is subjected to changes; according to the surface density formula M=m / s, mass The quantity m is constant, the surface area s changes with the stretching, so the surface density M changes with the magnetic field strength), thereby changing the vibration frequency. When the noise passes through the magnetostrictive resonance plate 7, it resonates with it, converts the sound energy into mechanical energy, and further converts the mechanical energy into heat energy and releases it into the environment through the vibration reduction chamber 6 and the keel 10, thereby achieving the first noise reduction. The error sensor 12 then collects the noise signal after the first noise reduction, and transmits it to the controller 15 through the second signal input line 17. The controller 15 uses an optimization algorithm to adaptively adjust and optimize the output electromagnetic signal, so that the vibration frequency of the magnetostrictive resonance plate 7 and the frequency of the noise are closer, the energy consumption of the sound is greater, and the noise reduction effect is improved.

[0063] The present invention has been preliminarily applied to the pipeline noise reduction of a gas distribution station, and has achieved good expected results: the straight pipe section can reduce noise by 12-15dB; the reaction speed can reach the us level, and the frequency can be adaptively adjusted according to the pipeline noise characteristics; it can be easily disassembled to provide support for pipeline maintenance and repair. In summary, the pipeline noise reduction system based on active frequency modulation of magnetostrictive resonance thin plates has strong feasibility, and because of the existence of the pipeline noise reduction system and the material diversity of magnetostrictive resonance thin plates, the pipeline noise reduction system based on magnetostrictive resonance thin plates still has huge room for innovation and practice.

[0064] Based on the above system, Figure 4 As shown, the present invention also provides a pipeline noise reduction method based on active frequency modulation, which specifically includes the following steps:

[0065] S1: Obtain the noise signal of the pipeline and perform preprocessing to obtain the first input signal.

[0066] In this embodiment, the preprocessing includes signal amplification, filtering, acoustic-electrical signal conversion, etc.

[0067] S2: The controller outputs an electromagnetic signal to the sound absorption module according to the first input signal.

[0068] S3: The sound absorption module adaptively adjusts the vibration frequency according to the electromagnetic signal and then absorbs the noise.

[0069] In this embodiment, the magnetostrictive resonance thin plate 7 is affected by the magnetic field, and its surface density changes, and the corresponding vibration frequency also changes accordingly, which is consistent with the maximum frequency of the noise signal, thereby achieving resonance noise reduction.

[0070] In this embodiment, it is known that different materials have different expansion and contraction properties after being stimulated by a magnetic field, and the vibration frequency of the thin plate is consistent with the maximum frequency f of the noise signal, that is, When f is known, the required surface density M of the thin plate can be known; and because M = m / s, where m is the mass, in the cylindrical material, the inner surface area s = πDL, D is the pipe diameter, and L is the real length of the thin plate; the relationship between L and the magnetostriction coefficient λ of the thin plate is L 0 Indicates the original length of the thin plate; in this application, when the magnetostrictive material on the thin plate is subjected to a change in the magnetic field, it will undergo a change in expansion and contraction. Figure 5 As shown, that is, λ=f(H), and this change can be obtained through experimental fitting and existing technology ("Magnetic Materials-Nanjing University Press-You Youwei, Zhang Shiyuan", "Theory and Application of Magnetostrictive Sensors-Science Press-Tan Yisong, Ren Limin", "Monograph on Sensing Technology of New Magnetostrictive Materials and Their Application in Biological Detection-Xi'an University of Electronic Science and Technology Press-Guo Xing", "Magnetostrictive Materials and Devices-Metallurgical Industry Press-Wang Bowen, Huang Shuying, Huang Wenmei").

[0071] When the acoustic wave detector detects the maximum equivalent frequency f0 of the first input signal, the controller calculates the magnetic field strength H0 to be released according to the above two formulas, and transmits the corresponding electromagnetic signal to the excitation coil 13 in the sound absorption module to release the magnetic field to the magnetostrictive resonance plate 7.

[0072] S4: The sound insulation module insulates the noise after the first noise reduction to achieve a second noise reduction.

[0073] In this embodiment, the process further includes S5: collecting the noise signal after passing through the sound absorption module, and then using an optimization algorithm to adaptively adjust and optimize the output electromagnetic signal.

[0074] The method for optimizing the electromagnetic signal in this embodiment is:

[0075] The original first input signal is obtained by the acoustic wave detector 9, and the electromagnetic regulating device analyzes and generates a corresponding electromagnetic signal for frequency modulation noise reduction. At the same time, the expected signal of the expected noise reduction effect is obtained by the first input signal and the electrical signal in the electromagnetic regulating device. The sound after the first noise reduction is detected by the error sensor, and the expected signal is analyzed with the sound after the first noise reduction. If it is found that the noise reduction frequency is higher / lower than the set value corresponding to the expected signal, the magnetic field strength is enhanced / weakened for feedback.

[0076] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A pipeline noise reduction system based on active frequency modulation, It is characterized in that It includes an acoustic wave detector, an electromagnetic adjustment device, and a noise reduction device; among which, An acoustic wave detector, installed on the outer wall of the pipeline, is used to detect noise signals; An electromagnetic regulating device, used for releasing a corresponding electromagnetic signal to the noise reduction device according to the detected noise signal; The noise reduction device is used to adaptively adjust the vibration frequency according to the electromagnetic signal so that the adjusted vibration frequency is consistent with the noise frequency to achieve resonance noise reduction.

2. A pipeline noise reduction system based on active frequency modulation as claimed in claim 1, It is characterized in that The noise reduction device includes a sound absorption module, a sound insulation module and a disassembly module; wherein the sound absorption module is used to adaptively adjust the vibration frequency according to the electromagnetic signal sent by the electromagnetic adjustment device, so that the adjusted vibration frequency resonates with the frequency of the noise, thereby absorbing the sound and achieving the first noise reduction; the sound insulation module is used to reflect and absorb the sound after the first noise reduction and achieve the second noise reduction; the disassembly module is used to fix the noise reduction device.

3. A pipeline noise reduction system based on active frequency modulation as claimed in claim 2, It is characterized in that The sound absorption module comprises a rigid outer wall (1), a magnetostrictive resonance thin plate (7) and an excitation coil (13); the magnetostrictive resonance thin plate (7) is arranged on the periphery of the pipe outer wall (2), and a sound absorption cavity (5) is present between the two; a keel (10) evenly arranged along the circumference is provided on the outer side of the magnetostrictive resonance thin plate (7), the other end of the keel (10) is provided with a rigid outer wall (1), and a vibration reduction cavity (6) is formed between the rigid outer wall (1) and the magnetostrictive resonance thin plate (7); and an excitation coil (13) is placed on the outer side of the rigid outer wall (1).

4. A pipeline noise reduction system based on active frequency modulation as claimed in claim 3, It is characterized in that The diameter of the excitation coil (13)>the diameter of the rigid outer wall (1)>the diameter of the magnetostrictive resonance thin plate (7)>the diameter of the pipe outer wall (2).

5. A pipeline noise reduction system based on active frequency modulation as claimed in claim 3, It is characterized in that The vibration-damping cavity (6) is filled with a vibration-damping material; and the magnetostrictive resonance thin plate (7) is made of a magnetostrictive material.

6. A pipeline noise reduction system based on active frequency modulation as claimed in claim 2, It is characterized in that The sound insulation module comprises a rigid sound insulation wall (8); the rigid sound insulation wall (8) is placed outside the excitation coil (13), and a sound insulation cavity (4) is formed between the rigid sound insulation wall (8).

7. A pipeline noise reduction system based on active frequency modulation as claimed in claim 6, It is characterized in that The sound insulation cavity (4) is filled with sound insulation material.

8. A pipeline noise reduction system based on active frequency modulation as claimed in claim 6, It is characterized in that An error sensor (12) is arranged in the sound insulation cavity (4).

9. A pipeline noise reduction system based on active frequency modulation as claimed in claim 1, It is characterized in that The electromagnetic regulation module comprises a controller (15), a first signal input line (16), an electromagnetic signal output line (14) and a second signal input line (17); The input end of the first signal input line (16) is connected to the output end of the acoustic wave detector (9), the output end of the first signal input line (16) is connected to the first input end of the controller (15), the output end of the controller (15) is connected to the input end of the electromagnetic signal output line (14), and the output end of the electromagnetic signal output line (14) is connected to the excitation coil (13); the input end of the second signal input line (17) is connected to the output end of the error sensor (12), and the output end of the second signal input line (17) is connected to the second input end of the controller (15).

10. A pipeline noise reduction method based on active frequency modulation according to the system of any one of claims 1 to 9, It is characterized in that The specific steps include: S1: Obtain a noise signal of a pipeline and perform preprocessing to obtain a first input signal; S2: The controller outputs an electromagnetic signal to the sound absorption module according to the first input signal; S3: The sound absorption module adaptively adjusts the vibration frequency according to the electromagnetic signal to make the vibration frequency consistent with the noise frequency, thus achieving resonance noise reduction and thus performing the first noise reduction; S4: The sound insulation module insulates the noise after the first noise reduction to achieve a second noise reduction.

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