Adjustable sound-absorbing duct structure with periodic additional horn-type sound cavity and design method

Abstract

The present application belongs to the technical field of sound absorption pipeline, and discloses a kind of adjustable sound absorption pipeline structure of periodic additional horn type sound cavity and design method, including horn-shaped sound cavity and pipeline;Pipeline side is connected with several horn-shaped sound cavities;Several horn-shaped sound cavities include periodically arranged hard boundary horn-shaped horn and air impedance boundary horn-shaped horn.The pipeline horn-shaped horn of the present application can realize multiple sound absorption peaks, and the peak value is larger, and then realize broadband sound absorption;Increase the meander index of pipeline horn mouth, the number of sound absorption peaks will be increased, the number of sound absorption peaks can be controlled by controlling the meander index of horn mouth, position, can be realized frequency modulation sound absorption according to need;Pipeline horn-shaped horn is easy to process, and can be better applied to engineering practice.The present application is combined into acoustic pipeline structure by horn-shaped sound cavity with different opening boundary conditions, and multiple peak values appear on the sound absorption curve of the periodic pipeline, and broadband sound absorption characteristics can be realized.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sound-absorbing ducts, and particularly relates to a tunable sound-absorbing duct structure with a periodic additional horn-type sound cavity and a design method. BACKGROUND

[0002] Currently, noise is still an important issue that people pay attention to in today's society. It not only has adverse effects on people's life and production and affects people's physical and mental health, but also affects the performance of equipment. However, it is very difficult to eliminate noise, especially low-frequency noise. The design of the present application is to eliminate duct noise and achieve the characteristics of wideband sound absorption in the duct.

[0003] Duct systems are very common in ship hulls and factory workshops, so designing an acoustic duct that is easy to process and has good sound absorption performance is of great significance for noise reduction. The existing sound-absorbing duct structure is coated with sound-absorbing materials or attached with materials such as perforated plates on the inner wall of the duct for sound absorption, or a Helmholtz resonant sound cavity is extended on the side of the duct. The principle of coating the inner wall of the duct with sound-absorbing materials is to convert sound energy into heat energy through friction and dissipate it, thereby reducing noise with the propagation distance. Although resistive silencers are widely used in ducts to control duct noise, they still have some defects. Resistive silencers perform well at medium and high frequencies, but fail at low frequencies due to high characteristic impedance. Although the Helmholtz resonant sound cavity has good sound absorption effect, the current improved structures of the Helmholtz resonant sound cavity are complex and heavy. The present application designs a horn-type duct with tunability, wideband sound absorption, and simple processing, which better solves the problems of poor tunability and small sound absorption range of the duct.

[0004] Through the above analysis, the problems and defects of the prior art are:

[0005] 1) Limited sound absorption effect: The existing resistive silencers perform well at medium and high frequencies, but fail at low frequencies due to high characteristic impedance. This makes it difficult to eliminate low-frequency noise, which has adverse effects on people's living and working environment and equipment performance.

[0006] 2) Poor tunability: The existing sound-absorbing duct structures, such as inner walls coated with sound-absorbing materials or attached with materials such as perforated plates, have difficulty in adjusting the sound absorption effect for different frequency ranges. This limits the adaptability of existing duct systems when dealing with multiple noise sources.

[0007] 3) Complex structure: Although the Helmholtz resonant sound cavity has good sound absorption effect, the current improved structures of the Helmholtz resonant sound cavity are complex, difficult to process, and heavy. This increases the manufacturing and maintenance costs of the duct system.

[0008] 4) Difficulty in achieving wideband sound absorption: Existing technologies have certain limitations in achieving wideband sound absorption, making it difficult to meet the needs of different application scenarios for wideband sound absorption.

[0009] 5) Space occupation and installation difficulty: Existing sound absorption pipeline structures often require additional space for installation, such as Helmholtz resonant cavities extending laterally from the pipeline. This increases the space occupation and installation difficulty of the system, which is not conducive to use in scenarios with limited space.

[0010] To solve these problems, the present invention designs a horn-shaped pipeline with adjustable, wideband sound absorption, and simple processing. By introducing an adjustable sound absorption pipeline structure with periodic additional horn-shaped cavities and an intelligent control system, the present invention improves sound absorption while achieving adjustable sound absorption, effectively solving the problems and defects in existing technologies. SUMMARY

[0011] To solve the problems of existing technologies, the present invention provides an adjustable sound absorption pipeline structure with periodic additional horn-shaped cavities and a design method.

[0012] The present invention is implemented as follows: an adjustable sound absorption pipeline structure with periodic additional horn-shaped cavities includes:

[0013] a horn-shaped cavity and a pipeline;

[0014] The pipeline is connected to several horn-shaped cavities on the side;

[0015] The several horn-shaped cavities include periodically arranged hard boundary horn-shaped barrels and air impedance boundary horn-shaped barrels.

[0016] Further, the horn-shaped barrel is composed of a horn-shaped cavity connected to a short pipe.

[0017] Further comprising:

[0018] Sensor: sound pressure sensors and vibration sensors are installed inside the pipeline and horn-shaped cavities to monitor the noise level and structural vibration in the environment in real time. Sensor data will be transmitted to the control system in real time as the basis for adjusting the sound absorption structure parameters.

[0019] Control system: The system receives sensor data and analyzes noise and vibration characteristics. Based on these data, the control system will calculate the optimal sound absorption structure parameters and automatically adjust the size of the horn-shaped cavities and the layout of the air impedance boundary horn-shaped barrels.

[0020] Adjustable structure: In order to make the horn-shaped sound cavity and the air impedance boundary horn-shaped cylinder be able to be adjusted in real time according to the adjustment requirements of the control system, electric drivers, telescopic materials or other adjustable structures are adopted. These adjustable structures will automatically adjust the shape and size of the horn-shaped sound cavity and the air impedance boundary horn-shaped cylinder according to the signals of the control system, so as to achieve the best sound absorption effect.

[0021] Human-computer interaction interface: allows the user to set specific noise control targets; the human-computer interaction interface can also display the performance of the current sound absorption pipeline in real time, such as the sound absorption coefficient and the frequency response.

[0022] Adaptive algorithm: enables the control system to automatically learn and adjust the sound absorption structure parameters according to the real-time monitored noise and vibration data. This will enable the sound absorption pipeline to achieve the best sound absorption performance under different working conditions.

[0023] Another object of the present application is to provide a design method of a periodic additional horn-shaped sound cavity adjustable sound absorption pipeline structure, which comprises:

[0024] Step one, apply the horn-shaped cylinder control equation to the pipeline for finite element modeling;

[0025] Step two, calculate the sound absorption amount of the hard boundary horn-shaped cylinder, and then analyze the characteristics of the horn-shaped cylinder converging energy and transmitting energy. In order to better simulate the horn-shaped cylinder converging sound from the pipeline, the hard boundary horn-shaped cylinder is changed to an air impedance boundary at the horn-shaped outlet, and the sound absorption amount is calculated;

[0026] Step three, combine the horn-shaped cylinders with the above two different boundaries and calculate their acoustic characteristics. In addition to combining the sound absorption peaks of the two cylinders, the combined unit cell also appears a lower frequency sound absorption peak. Compared with a single hard boundary sound cylinder and a single sound cylinder with a PML layer, the combined sound cylinder better realizes the low-frequency and wide-frequency sound absorption characteristics.

[0027] Further, the outer length of the horn-shaped cylinder is controlled by an index, and the control equation is Where S0 is the area of the throat of the horn-shaped cylinder, and δ is the meandering index, which is a parameter that determines the speed of the cross-sectional area change.

[0028] In combination with the above technical solutions and the technical problems solved, the technical solution to be protected by the present application has the following advantages and positive effects:

[0029] Firstly, the pipeline horn-shaped cylinder of the present application can realize multiple sound absorption peaks with large peak values, thereby realizing wide-frequency sound absorption.

[0030] The present application increases the serpentine index of the pipe horn mouth, so that the number of sound absorption peaks is increased, the number and position of the sound absorption peaks can be controlled by controlling the serpentine index of the horn mouth, and frequency-adjustable sound absorption can be realized according to requirements.

[0031] The pipe horn-shaped nozzle of the present application is easy to process and can be better applied to engineering practice.

[0032] The present application combines the horn-shaped acoustic cavities with different opening boundary conditions to form an acoustic pipe structure, the periodic pipe has multiple peak values in the sound absorption amount curve, and wideband sound absorption characteristics can be realized. The horn-shaped acoustic cavity is composed of a horn-shaped cavity connected with a short pipe, and the resonance frequency thereof can be directly calculated through simplification, and the sound absorption effect is good at the resonance frequency.

[0033] The horn-shaped cavity of the present application has the characteristics of easy energy convergence and energy transmission, so a simple and adjustable horn-shaped pipe acoustic cavity is designed, which can be used for noise control of various pipe systems.

[0034] Secondly, the present application simultaneously comprises a horn-shaped acoustic cavity and an elastic flat plate, has the technical effects and advantages of realizing wideband sound absorption and adjustable sound absorption, realizes the control of noise through wideband sound absorption, reduces the transmission of noise into the human ear, and avoids the influence of noise on physical and mental health. The present application is easy to process and can be applied to engineering practice.

[0035] Thirdly, the creativity of the present application as the claim is also reflected in the following important aspects:

[0036] (1) The expected income and commercial value of the technical scheme of the present application after transformation are:

[0037] The present application can compensate for the problem of insufficient pipe noise processing after technical transformation, better realize wideband sound absorption, improve the operation of equipment, improve the working state and physical and mental health of people, reduce noise pollution, and improve the efficiency of people's work. The present application can be better applied to engineering practice after technical transformation, improve the working state of equipment, avoid excessive wear and tear of equipment, improve the physical and mental health of people, and improve the work efficiency of enterprises to create more value in the same labor time.

[0038] (2) The technical scheme of the present application fills the technical gap in the industry at home and abroad:

[0039] The technical scheme of the present application provides a periodic additional horn-shaped acoustic cavity sound pipe structure which is simple in structure, easy to manufacture, and can adjust the sound absorption frequency band according to requirements.

[0040] (3) Whether the technical scheme of the present application solves the technical problems that people have been eager to solve but have failed to solve successfully:

[0041] The application preferably solves the desire of people for reducing pipeline noise, and can not only realize broadband sound absorption, but also realize the adjustability of sound absorption for different frequency bands. The application is easy to process, and can be well applied to engineering practice. The application considers the angle of people working quietly, and proposes a periodic additional horn type sound cavity applied to reduce pipeline noise for eliminating noise.

[0042] (4) Whether the technical solution of the application overcomes the technical bias:

[0043] The muffler is widely used in the pipeline due to its simple and efficient characteristics. The muffler used in the pipeline is mostly resistive muffler and reactive muffler. The resistive muffler utilizes the propagation of sound waves in porous sound-absorbing materials or sound-absorbing structures, and the friction converts sound energy into heat energy and dissipates, so that the noise decreases with the propagation distance. Although the resistive muffler is widely used in the pipeline to control the pipeline noise, it still has some defects. The resistive muffler has good performance at medium and high frequencies, but it fails at low frequencies due to the excessively high characteristic impedance. Secondly, the resistive muffler mainly using porous sound-absorbing materials has problems such as dust accumulation and bacterial growth, and the material is easy to corrode, thus limiting its use range. The reactive muffler is composed of pipes and chambers with sudden interfaces, and has good control effect on low frequency and medium-low frequency noise, and does not use porous sound-absorbing materials, so it has a longer service life in harsh environments such as high temperature and corrosion. The periodic additional horn type sound cavity provided by the application belongs to the reactive muffler. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 is a structure schematic diagram of the adjustable sound-absorbing pipeline structure of the periodic additional horn type sound cavity provided by the embodiment of the application;

[0045] Figure 2 is a hard boundary model schematic diagram of the parameterized curve being 10e 0.015s ;

[0046] Figure 3 is a hard boundary model schematic diagram of the parameterized curve being 10e 0.035s ;

[0047] Figure 4 is a hard boundary model schematic diagram of the parameterized curve being 10e 0.05s ;

[0048] Figure 5 is a sound-absorbing curve of a hard boundary sound horn with different parameterized curves provided by the embodiment of the application;

[0049] Figure 6 is a hard boundary model schematic diagram of the parameterized curve being 10e 0.025sSound absorption peak response cloud diagram of the hard boundary sound cone model with the parameterized curve of 10e

[0050] Figure 7 Sound absorption curve of the hard boundary sound cone with different parameterized curves provided by the embodiment of the present application;

[0051] Figure 8 Sound absorption peak response cloud diagram of the hard boundary sound cone model with the parameterized curve of 10e 0.035s

[0052] Figure 9 Sound absorption curve of the hard boundary sound cone with different parameterized curves provided by the embodiment of the present application;

[0053] Figure 10 Band gap of the hard boundary sound cone model with the periodic additional parameterized curve of 10e 0.035s

[0054] Figure 11 Sound absorption curve of the hard boundary sound cone model with the periodic additional parameterized curve of 10e 0.035s

[0055] Figure 12 Sound absorption peak response cloud diagram of the hard boundary sound cone with the periodic additional parameterized curve of 10e 0.035s

[0056] Figure 13 Sound absorption curve of the sound cone with PML layer and different parameterized curves provided by the embodiment of the present application;

[0057] Figure 14 Sound absorption peak response cloud diagram of the PML layer sound cone model with the parameterized curve of 10e 0.025s

[0058] Figure 15 Sound absorption curve of the sound cone with PML layer and different parameterized curves provided by the embodiment of the present application;

[0059] Figure 16 Sound absorption peak response cloud diagram of the PML layer sound cone model with the parameterized curve of 10e 0.035s

[0060] Figure 17 Band gap of the PML layer sound cone model with the periodic additional parameterized curve of 10e 0.035s ​​​​​​Schematic diagram of the acoustic horn model with PML layer;

[0061] Figure 18 The periodic additional parameterized curve provided by the embodiment of the present invention is 10e 0.035s Bandgap of acoustic horn model with PML layer;

[0062] Figure 19 The periodic additional parameterized curve provided by the embodiment of the present invention is 10e 0.035s Sound absorption curve of the horn model with PML layer sound;

[0063] Figure 20 The periodic additional parameterization curve provided by the embodiment of the present invention is 10e 0.035s Example of the peak absorption response cloud of the PML layered horn model: 521Hz

[0064] Figure 21 The periodic additional parameterized curve provided by the embodiment of the present invention is 10e 0.035s Schematic diagram of the acoustic horn unit cell model with PML layer and hard boundary;

[0065] Figure 22 The periodic additional parameterized curve provided by the embodiment of the present invention is 10e 0.035s Sound absorption curve of the horn unit cell model with PML layer and hard boundary;

[0066] Figure 23 The periodic additional parameterized curve provided by the embodiment of the present invention is 10e 0.035s Examples of peak absorption response cloud diagrams of the horn model with PML layer and hard boundary sound: (a): 741Hz, (b): 1621Hz;

[0067] Figure 24 The periodic additional parameterized curve provided by the embodiment of the present invention is 10e 0.035s Bandgap of acoustic horn model with PML layer and hard boundary;

[0068] Figure 25 The periodic additional parameterized curve provided by the embodiment of the present invention is 10e 0.035s Sound absorption curve of the horn model with PML layer and hard boundary sound;

[0069] Figure 26 The periodic additional parameterized curve provided by the embodiment of the present invention is 10e 0.035s Example of the peak response cloud diagram of the horn model with PML layer and hard boundary sound: 941Hz;

[0070] Figure 27 The periodic additional parameterized curve provided by the embodiment of the present invention is 10e 0.035s Physical picture of the hard boundary acoustic horn unit cell model;

[0071] Figure 28 is a 3D schematic view of a hard boundary horn-like cell model 3 of the periodic additional parameterized curve 10e provided by the embodiment of the present application. 0.035s

[0072] Figure 29 is a physical picture of a PML layer horn-like cell model of the periodic additional parameterized curve 10e provided by the embodiment of the present application. 0.035s

[0073] Figure 30 is a 3D schematic view of a PML layer horn-like cell model 3 of the periodic additional parameterized curve 10e provided by the embodiment of the present application. 0.035s

[0074] Figure 31 is a physical picture of a combined cell model of the periodic additional parameterized curve 10e provided by the embodiment of the present application. 0.035s

[0075] Figure 32 is a 3D schematic view of a combined cell model of the periodic additional parameterized curve 10e provided by the embodiment of the present application. 0.035s

[0076] In the figure: 1, pipeline; 2, hard boundary horn-like cell; 3, air impedance boundary horn-like cell. DETAILED DESCRIPTION

[0077] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0078] The embodiment of the present application provides an adjustable sound absorbing pipeline structure of a periodic additional horn type sound cavity. The structure comprises a pipeline 1, a hard boundary horn-like cell 2 and an air impedance boundary horn-like cell 3.

[0079] The specific connection relationship is as follows: one end of the pipeline 1 is connected to the inlet of the hard boundary horn-like cell 2, the outlet of the hard boundary horn-like cell 2 is connected to the inlet of the air impedance boundary horn-like cell 3, and the outlet of the air impedance boundary horn-like cell 3 is connected to the other end of the pipeline 1.

[0080] ​​​​​The working principle of the structure is as follows: when the sound wave is transmitted from the pipeline 1 to the hard boundary horn-shaped cylinder 2, the energy of the sound wave will be partially reflected back into the pipeline 1, and part of the energy will enter the air impedance boundary horn-shaped cylinder 3. In the air impedance boundary horn-shaped cylinder 3, the sound wave will be affected by impedance matching, so that part of the energy will be absorbed, thereby reducing the reflection and transmission of the sound wave. Finally, the sound wave energy in the pipeline will be effectively absorbed, thereby achieving a better sound absorption effect.

[0081] The adjustability of the structure is reflected in that by adjusting the cross-sectional area, length and other parameters of the inlet and outlet of the air impedance boundary horn-shaped cylinder 3, the sound absorption effect of the structure can be adjusted.

[0082] The adjustable sound absorption pipeline structure of the periodic additional horn-type sound cavity provided by the embodiment of the present application can be optimized by intelligent technology to improve the sound absorption performance and practicality. The specific implementation is as follows:

[0083] 1) Add sensors: install sound pressure sensors and vibration sensors inside the pipeline and the horn-shaped sound cavity to monitor the noise level and structure vibration in real time. The sensor data will be transmitted to the control system in real time as the basis for adjusting the sound absorption structure parameters.

[0084] 2) Control system: develop an integrated intelligent control system that can receive sensor data and analyze noise and vibration characteristics. Based on these data, the control system will calculate the optimal sound absorption structure parameters and automatically adjust the size of the horn-shaped sound cavity and the layout of the air impedance boundary horn-shaped cylinder.

[0085] 3) Adjustable structure: in order to make the horn-shaped sound cavity and the air impedance boundary horn-shaped cylinder be able to be adjusted in real time according to the adjustment requirements of the control system, electric actuators, stretchable materials or other adjustable structures can be used. These adjustable structures will automatically adjust the shape and size of the horn-shaped sound cavity and the air impedance boundary horn-shaped cylinder according to the signals of the control system to achieve the best sound absorption effect.

[0086] 4) Human-computer interaction interface: develop a human-computer interaction interface to allow users to set specific noise control targets such as expected noise reduction level, frequency range, etc. In addition, the human-computer interaction interface can also display the performance of the current sound absorption pipeline in real time, such as sound absorption coefficient, frequency response, etc.

[0087] 5) Adaptive algorithm: design an adaptive algorithm so that the control system can automatically learn and adjust the sound absorption structure parameters according to the real-time monitored noise and vibration data. This will enable the sound absorption pipeline to achieve the best sound absorption performance under different working conditions.

[0088] Through the above intelligent improvement, the adjustable sound-absorbing pipeline structure with periodic additional horn-shaped sound cavity will have higher sound-absorbing performance and practical value. The intelligent sound-absorbing pipeline structure can be widely applied to various fields such as building, transportation and industry, effectively reduces environmental noise, and improves the quality of people's living and working environment.

[0089] As shown in Figure 1 The adjustable sound-absorbing pipeline structure with periodic additional horn-shaped sound cavity provided by the embodiment of the present application comprises a horn-shaped sound cavity and a pipeline 1.

[0090] The pipeline 1 is connected with a plurality of horn-shaped sound cavities on the side.

[0091] The plurality of horn-shaped sound cavities comprise periodically arranged hard boundary horn-shaped sound tubes 2 and air impedance boundary horn-shaped sound tubes 3.

[0092] The horn-shaped sound tube in the embodiment of the present application is composed of a horn-shaped cavity and a short pipe.

[0093] The working principle of the embodiment of the present application is as follows:

[0094] 1. The horn-shaped sound tube can converge sound wave energy to transmit sound farther and more widely. Inspired by the horn-shaped sound tube, the horn-shaped sound tube is applied to pipeline noise reduction, which can be applied to industry to reduce pipeline noise in engineering. The sound is transmitted to the open site through the horn-shaped pipeline, which can efficiently avoid the pipeline sound from being transmitted to the ears of people in the workshop. The outer edge length of the horn-shaped sound tube is controlled by an index, and the control equation is where S0 is the area of the throat of the sound tube, and δ is called the meandering index, which is a parameter that determines the speed of the cross-sectional area change. After obtaining the control equation of the horn-shaped sound tube, it is applied to the pipeline for calculation.

[0095] 2. In the early stage of design, the sound absorption amount of the hard boundary horn-shaped sound tube is calculated. According to the calculation result, the sound absorption effect is good. Then, the characteristics of energy convergence and energy transmission of the sound tube are analyzed. The hard boundary horn-shaped sound tube is changed to an air impedance boundary at the horn-shaped outlet, and the sound absorption amount is calculated. According to the calculation result, the sound absorption effect is good.

[0096] 3. After the design of the two schemes in step 3, in order to further improve the sound absorption performance of the structure, the horn-shaped sound tubes with two different boundaries in step 3 are combined, and the acoustic characteristics are calculated. It is found that the combined unit cell not only combines the sound absorption peaks of the two sound tubes in step 3, but also has a lower frequency sound absorption peak. Compared with the single hard boundary sound tube and the single sound tube with PML layer in step 3, the combined sound tube can better realize the low-frequency and wide-frequency sound absorption characteristics.

[0097] 4. The combined sound horn in step 4 is periodically arranged along the pipeline, the sound absorption characteristics of the periodic pipeline are calculated, and it is found that in addition to the sound absorption peak at the original single cell sound absorption peak frequency, the sound absorption curve also appears a lower sound absorption peak at other frequencies. Secondly, the sound absorption peak of the periodic pipeline can reach 550 dB at some frequencies, indicating that the periodic pipeline can achieve good sound absorption effect.

[0098] The design method of the adjustable sound absorption pipeline structure of the periodic additional horn type sound cavity in the embodiment of the application comprises:

[0099] Step one, apply the horn-shaped horn control equation to the pipeline for calculation;

[0100] Step two, calculate the sound absorption amount of the hard boundary horn-shaped horn, and then analyze the characteristics of the horn energy convergence and energy transmission, change the hard boundary horn-shaped horn to an air impedance boundary at the horn-shaped outlet, and calculate the sound absorption amount;

[0101] Step three, combine the two kinds of horn-shaped horns with different boundaries and calculate their acoustic characteristics, the combined single cell not only combines the sound absorption peaks of the two kinds of horns, but also appears a lower frequency sound absorption peak, compared with a single hard boundary sound horn and a single sound horn with a PML layer, the combined sound horn better realizes the low frequency and wide frequency sound absorption characteristics.

[0102] The outer length of the horn-shaped horn in the embodiment of the application is controlled by an index, and the control equation is Where S0 is the area of the throat of the horn-shaped horn, and δ is the meandering index, which is a parameter that determines the speed of cross-sectional area change.

[0103] A ship pipeline system is provided with the adjustable sound absorption pipeline structure of the periodic additional horn type sound cavity.

[0104] A factory workshop pipeline system is provided with the adjustable sound absorption pipeline structure of the periodic additional horn type sound cavity.

[0105] A sound absorption and noise reduction pipeline system is provided with the adjustable sound absorption pipeline structure of the periodic additional horn type sound cavity.

[0106] The following are six specific embodiments of the application, which show the practical application of the adjustable sound absorption pipeline structure of the periodic additional horn type sound cavity in different application scenarios:

[0107] Embodiment 1: architectural acoustics

[0108] In large public buildings such as concert halls, theaters, etc., adjustable sound-absorbing duct structures with periodic additional horn-type cavities can be installed on walls, ceilings, or floors to eliminate indoor echoes, improve sound quality, and reduce noise propagation. An intelligent control system can automatically adjust the sound-absorbing structure parameters according to the type of performance and audience distribution to achieve the best acoustic effect.

[0109] Example 2: Traffic noise control

[0110] Along roads, railways, or subways, adjustable sound-absorbing duct structures with periodic additional horn-type cavities are set up to absorb traffic noise and reduce the noise impact on surrounding residents. An intelligent control system can monitor traffic flow and noise characteristics in real time and automatically adjust the sound-absorbing structure parameters as needed.

[0111] Example 3: Industrial noise control

[0112] In factories or production workshops, adjustable sound-absorbing duct structures with periodic additional horn-type cavities can be used to reduce equipment noise and protect employee hearing. An intelligent control system can monitor equipment operating status and noise levels in real time and automatically adjust the sound-absorbing structure parameters to optimize noise control effects.

[0113] Example 4: Aviation noise control

[0114] Inside the passenger cabin of an airplane, adjustable sound-absorbing duct structures with periodic additional horn-type cavities are installed to reduce engine noise and air flow noise and improve passenger comfort. An intelligent control system can automatically adjust the sound-absorbing structure parameters according to flight states such as takeoff, cruising, landing, etc., to achieve the best noise control effect.

[0115] Example 5: Home soundproofing

[0116] In the walls, ceilings, or floors of a home, adjustable sound-absorbing duct structures with periodic additional horn-type cavities are installed to isolate neighbor or external noise and improve living comfort. An intelligent control system can automatically adjust the sound-absorbing structure parameters according to user needs and noise levels.

[0117] Example 6: Car soundproofing

[0118] Inside the passenger compartment of a car, adjustable sound-absorbing duct structures with periodic additional horn-type cavities are installed to reduce engine, wind, and road noise and improve passenger comfort. An intelligent control system can automatically adjust the sound-absorbing structure parameters according to driving conditions and speed to achieve the best soundproofing effect.

[0119] These six examples demonstrate the broad application potential of adjustable sound-absorbing duct structures with periodic additional horn-type cavities in different scenarios, helping to improve people's living and working environments.

[0120] The embodiment of the present application has achieved some positive effects in research and development or use, and has great advantages compared with the prior art. The following content is described in combination with data, charts and the like in the test process.

[0121] Figures 2 to 4 are schematic diagrams of the edge boundary model of different parameterized curves; Figure 5 、 Figure 7 、 Figure 9 are sound absorption curve diagrams corresponding to the hard boundary sound horn of different parameterized curves, the abscissa is frequency, and the ordinate is sound absorption amount, and the higher the sound absorption amount is, the better the sound absorption effect is; Figure 6 、 Figure 8 are examples of sound absorption peak response cloud diagrams corresponding to the hard boundary sound horn of different parameterized curves; Figure 10 is a band gap diagram of the hard boundary sound horn model with a periodic additional parameterized curve of 10e 0.035s ; Figure 11 is a sound absorption curve of the hard boundary sound horn model with a periodic additional parameterized curve of 10e 0.035s ; Figure 12 is an example of a peak response cloud diagram of the hard boundary sound horn model with a periodic additional parameterized curve of 10e 0.035s ; Figure 13 、 Figure 15 are sound absorption curves of the sound horn with a PML layer and different parameterized curves; Figure 14 、 Figure 16 are examples of sound absorption peak response cloud diagrams of the PML layer sound horn model with different parameterized curves; Figure 17 、 Figure 18 、 Figure 19 are respectively a schematic diagram, a band gap diagram and a sound absorption curve diagram of the PML layer sound horn model with a periodic additional parameterized curve of 10e 0.035s ; Figure 20 is an example of a sound absorption peak response cloud diagram of the PML layer sound horn model with a periodic additional parameterized curve of 10e 0.035s ; Figure 21 、 Figure 22 、 Figure 23 are respectively a schematic diagram, a sound absorption curve diagram and an example of a peak response cloud diagram of the PML layer and hard boundary sound horn unit cell model with a parameterized curve of 10e 0.035s ; Figure 24 、 Figure 25 、 Figure 26 are respectively a band gap, a sound absorption curve and an example of a peak response cloud diagram of the PML layer and hard boundary sound horn model with a periodic additional parameterized curve of 10e 0.035s ; Figure 27 、 Figure 28 is a parameterized curve of 10e 0.035sThe physical diagram and 3D schematic diagram of the hard boundary sound horn unit model of the present application are shown in Figures 1 and 2, respectively. Figure 29 、 Figure 30 The physical diagram and 3D schematic diagram of the PML layer sound horn unit model of the present application are shown in Figures 3 and 4, respectively, with the periodic additional parameterized curve being 10e 0.035s Figure 31 、 Figure 32 The physical diagram and 3D schematic diagram of the combined unit model of the present application are shown in Figures 5 and 6, respectively, with the periodic additional parameterized curve being 10e 0.035s

[0122] Through finite element modeling calculation, comprehensive graphics and sound absorption effect, the parameterized curve of 10e 0.035s is selected at 8 cycles. From the perspective of practical application and sound absorption effect, the horn type sound cavity with the parameterized curve of 10e 0.035s is selected in the experiment. According to the sound absorption curve and band gap diagram, the sound absorption effect of the present application is very significant, and the wideband sound absorption and the adjustability of noise control are realized.

[0123] The present application also provides a factory workshop pipeline system, which is provided with an adjustable sound absorption pipeline structure of a periodic additional horn type sound cavity, and the specific implementation is as follows:

[0124] 1) System structure: the factory workshop pipeline system includes an air conveying pipeline, a hanger, an adjustable sound absorption pipeline structure of a periodic additional horn type sound cavity, and an intelligent control system. The air conveying pipeline is used for functions such as ventilation, exhaust and air conditioning, and the hanger fixes the air conveying pipeline in the workshop.

[0125] 2) Setting of horn type sound cavity: a plurality of horn type sound cavities are periodically arranged on the outer wall of the air conveying pipeline, including hard boundary horn type sound cavities and air impedance boundary horn type sound cavities. These horn type sound cavities absorb the noise inside the pipeline to reduce the noise level in the workshop.

[0126] 3) Sensor installation: sound pressure sensors and vibration sensors are installed inside the pipeline and in the workshop to monitor the noise level and structural vibration inside and outside the pipeline in real time. The sensor data will be transmitted to the intelligent control system in real time for adjusting the sound absorption structure parameters.

[0127] 4) Intelligent control system: the system receives sensor data and analyzes noise and vibration characteristics, calculates the best sound absorption structure parameters according to the real-time monitoring results, and automatically adjusts the size and layout of the periodic additional horn type sound cavity. In addition, the intelligent control system can also receive information from the production line control system to more accurately adjust the sound absorption structure parameters.

[0128] ​​5) Adjustable structure: The horn-shaped acoustic cavity and air impedance boundary horn-shaped nozzle adopt electric drivers, stretchable materials or other adjustable structures, which automatically adjust the shape and size according to the signal of the intelligent control system, so as to achieve the best sound absorption effect.

[0129] 6) Human-computer interaction interface: A human-computer interaction interface is developed, which allows factory managers to set specific noise control targets, such as expected noise reduction levels, frequency ranges, etc. In addition, the human-computer interaction interface can also display the current performance of the sound absorption pipeline in real time, such as the sound absorption coefficient, frequency response, etc.

[0130] Through the above design, the factory workshop pipeline system is provided with an adjustable sound absorption pipeline structure with periodic additional horn-shaped acoustic cavities, which can effectively reduce the noise level in the workshop and improve the quality of the working environment of employees. At the same time, the application of the intelligent control system enables the sound absorption effect to be adjusted in real time according to the actual situation, improving the sound absorption efficiency.

[0131] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0132] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can make any modification, equivalent replacement and improvement within the technical range disclosed by the present application, which is within the spirit and principles of the present application, and should be covered within the protection scope of the present application.

Claims

1. An adjustable sound absorbing duct structure of a periodic additional horn type acoustic cavity, characterized by, Comprise: A horn-shaped sound cavity and a pipeline; The pipeline is connected with several horn-shaped sound cavities on the side; The several horn-shaped sound cavities comprise periodically arranged hard boundary horn-shaped sound cylinders and air impedance boundary horn-shaped sound cylinders; Further comprising: Sensors: install sound pressure sensors and vibration sensors inside the pipeline and the horn-shaped sound cavity, real-time monitor the noise level and structural vibration in the environment, and transmit the sensor data to the control system in real time as the basis for adjusting the sound absorption structure parameters; Control system: the system receives sensor data and analyzes noise and vibration characteristics, based on these data, the control system will calculate the best sound absorption structure parameters, and automatically adjust the size of the horn-shaped sound cavity and the layout of the air impedance boundary horn-shaped sound cylinder; Adjustable structure: in order to make the horn-shaped sound cavity and the air impedance boundary horn-shaped sound cylinder be able to be adjusted in real time according to the adjustment requirements of the control system, electric drive, telescopic material or other adjustable structure is adopted; the adjustable structure automatically adjusts the shape and size of the horn-shaped sound cavity and the air impedance boundary horn-shaped sound cylinder according to the signal of the control system; Human-computer interaction interface: allows users to set specific noise control targets; the human-computer interaction interface can also display the performance of the current sound absorption pipeline in real time, such as sound absorption coefficient, frequency response; Adaptive algorithm: enables the control system to automatically learn and adjust the sound absorption structure parameters according to the real-time monitored noise and vibration data, so that the sound absorption pipeline can achieve the best sound absorption performance under different working conditions.

2. The tunable absorber duct structure of claim 1, wherein, The horn-shaped sound cylinder is composed of a horn-shaped cavity and a short pipe.

3. A design method of an adjustable sound absorbing duct structure for the periodic additional horn type acoustic cavity according to any one of claims 1 to 2, characterized by, The design method of the adjustable sound absorption pipeline structure with periodic additional horn-shaped sound cavities comprises: Step one, apply the horn-shaped sound cylinder control equation to the pipeline for calculation; Step two, calculate the sound absorption amount of the hard boundary horn-shaped sound cylinder, and then analyze the characteristics of the sound cylinder converging energy and transmitting energy, change the hard boundary horn-shaped sound cylinder to an air impedance boundary at the horn-shaped outlet, and calculate its sound absorption amount; Step three, combine the two kinds of horn-shaped sound cylinders with different boundaries and calculate their acoustic characteristics; the combined unit cell not only integrates the sound absorption peaks of the two kinds of sound cylinders, but also appears a lower frequency sound absorption peak; compared with a single hard boundary sound cylinder and a single sound cylinder with PML layer, the combined sound cylinder better realizes the low-frequency and wide-frequency sound absorption characteristics.

4. The design method of an adjustable sound absorbing duct structure of a periodic additional horn type acoustic cavity according to claim 3, characterized in that, The horn-shaped bell outer side length is controlled by an index, and a control equation is Where S0 is the area of the throat of the horn-shaped bell, and δ is the meandering index, which is a parameter determining the speed of the cross-sectional area change.

5. A ship hull piping system characterized by, The ship pipeline system is provided with the adjustable sound absorption pipeline structure with periodic additional horn-shaped sound cavities according to any one of claims 1-2.

6. A sound absorbing noise reducing duct system characterized by, The sound absorption and noise reduction pipeline system is provided with the adjustable sound absorption pipeline structure with periodic additional horn-shaped sound cavities according to any one of claims 1-2.

7. A factory plant piping system, characterized by, The adjustable sound absorption pipeline structure with periodic additional horn-shaped sound cavities is specifically implemented as follows: System structure: the factory workshop pipeline system comprises an air conveying pipeline, a hanger, an adjustable sound absorption pipeline structure with periodic additional horn-shaped sound cavities, and an intelligent control system; the air conveying pipeline is used for ventilation, exhaust and air conditioning, and the hanger fixes the air conveying pipeline in the workshop; Horn-shaped cavities: Periodically arranging several horn-shaped cavities on the outer wall of the air conveying pipeline, including hard boundary horn-shaped cylinders and air impedance boundary horn-shaped cylinders; these horn-shaped cavities absorb the noise inside the pipeline, reducing the noise level in the workshop; Sensor installation: Installing sound pressure sensors and vibration sensors inside the pipeline and in the workshop to monitor the noise level and structural vibration inside and outside the pipeline in real time; sensor data will be transmitted to the intelligent control system in real time for adjusting the sound absorption structure parameters; Intelligent control system: The system receives sensor data and analyzes noise and vibration characteristics, calculates the best sound absorption structure parameters according to real-time monitoring results, and automatically adjusts the size and layout of the periodic additional horn-shaped cavities; in addition, the intelligent control system can also receive information from the production line control system to more accurately adjust the sound absorption structure parameters; Adjustable structure: The horn-shaped cavities and air impedance boundary horn-shaped cylinders use electric drivers, stretchable materials or other adjustable structures to automatically adjust the shape and size according to the signals of the intelligent control system to achieve the best sound absorption effect; Human-computer interaction interface: Allows factory managers to set specific noise control targets, such as expected noise reduction level, frequency range; the human-computer interaction interface can also display the current performance of the sound absorption pipeline in real time.

8. A computer readable storage medium storing a computer program, wherein the computer program is executed by a processor to make the processor execute the steps of the design method of the adjustable sound absorption pipeline structure with periodic additional horn-shaped cavities according to any one of claims 3-4.

9. An information data processing terminal, characterized by The information data processing terminal is used to realize the steps of the design method of the adjustable sound absorption pipeline structure with periodic additional horn-shaped cavities according to any one of claims 3-4.

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