阅读说明：本技术 一种复频同相位平面阵定向发射声波装置 (Complex frequency same-phase planar array directional transmitting sound wave device ) 是由 苏洋 李铁键 任海涛 王光谦 王兴奎 于 2021-09-14 设计创作，主要内容包括：本公开提供的复频同相位平面阵定向发射声波装置,包括气缸；驱动部件,安装于气缸内,驱动部件的输出端与一中心轴连接；固定盘,套设在中心轴上,并与气缸的上口固定连接成为气缸的上封口,固定盘上沿径向等间距打孔、并在等差直径的圆周上均匀分布形成若干通气孔；旋转盘,套设在中心轴且位于固定盘之上,并由驱动部件驱动旋转,旋转盘上设有若干在径向上与通气孔相对应的喷气孔,各圆周上的喷气孔数量与通气孔数量不同以产生复频；压盖,套设在中心轴且位于旋转盘之上,并与气缸的上口固定连接。本装置声波按平面阵列的形式直接发射；保证了声波的相位相同,复频声波声学参量阵极大地提高了声波的指向性,可实现声波的大能量远距离定向传输。(The compound frequency same-phase planar array directional transmitting sound wave device comprises a cylinder; the driving part is arranged in the cylinder, and the output end of the driving part is connected with a central shaft; the fixed disc is sleeved on the central shaft and is fixedly connected with the upper opening of the cylinder to form an upper seal of the cylinder, holes are punched on the fixed disc at equal intervals along the radial direction, and a plurality of vent holes are uniformly distributed on the circumference with the equal difference diameter; the rotating disc is sleeved on the central shaft, is positioned on the fixed disc and is driven to rotate by the driving part, a plurality of air injection holes corresponding to the vent holes in the radial direction are arranged on the rotating disc, and the number of the air injection holes on each circumference is different from that of the vent holes so as to generate a complex frequency; and the gland is sleeved on the central shaft, is positioned on the rotating disk and is fixedly connected with the upper opening of the cylinder. The sound wave of the device is directly emitted in a planar array form; the same phase of sound waves is ensured, the directivity of the sound waves is greatly improved by the complex frequency sound wave acoustic parametric array, and large-energy long-distance directional transmission of the sound waves can be realized.)

1. A complex frequency in-phase planar array directional transmitting acoustic wave device, comprising:

a cylinder;

the driving component is arranged in the cylinder, and the output end of the driving component is connected with a central shaft;

the fixed disc is sleeved on the central shaft and is fixedly connected with the upper opening of the cylinder to form an upper seal of the cylinder, holes are punched on the fixed disc at equal intervals along the radial direction, and a plurality of air holes are uniformly distributed on the circumference with the equal difference diameter;

the rotating disc is sleeved on the central shaft, is positioned on the fixed disc and is driven to rotate by the driving part, a plurality of air injection holes corresponding to the vent holes in the radial direction are arranged on the rotating disc, and the number of the air injection holes on each circumference is different from that of the vent holes so as to generate a complex frequency; and

and the gland bush is sleeved on the central shaft, is positioned on the rotating disc and is fixedly connected with the upper opening of the cylinder.

2. The complex frequency same phase planar array directional transmitting acoustic wave device according to claim 1, wherein the distribution of said air injection holes on said rotating disk is designed according to the principle of acoustic parametric transmitting array, that is, each of said air injection holes constitutes a sound source, all the sound sources are divided into two or more groups with different frequencies, the local frequency sound wave of each group of sound sources propagates in the near field at a corresponding spread angle, and forms the difference frequency sound wave between each group in the far field.

3. The complex frequency same phase planar array directional transmitting acoustic wave device according to claim 1, wherein the cylinder includes a cylinder body having an inverted trapezoidal cross section and an intake pipe communicating with a bottom of the cylinder body; the last mouth of cylinder main part is equipped with and is used for fixed connection the last ring of fixed disk, go up the ring with be equipped with the sealing strip between the cylinder main part.

4. The apparatus according to claim 3 wherein a reverse tapered deflector cone is disposed below said motor in said cylinder body.

5. The complex frequency same phase planar array directional transmitting acoustic wave device according to claim 1, wherein the central shaft is a stepped shaft, a first through hole for passing the output end of the driving member is provided in the middle of the central shaft, and the first through hole is fitted with the output end key groove of the driving member; the central shaft is respectively connected with the gland and the fixed disc through a 1# bearing and a 2# bearing, and the central shaft is matched with the rotating disc key groove.

6. The complex frequency same phase planar array directional transmitting acoustic wave device according to claim 1, wherein a # 3 bearing is provided between the fixed disk and the rotating disk for ensuring the relative rotation between the fixed disk and the rotating disk, an installation space of a lower half part of the rotating disk is formed on an upper surface of the fixed disk, a driving component installation block is provided at a center of a lower plane of the fixed disk, and a second through hole for passing an output of the driving component is provided at a middle part of the driving component installation block.

7. The complex frequency same phase plane array directional transmitting acoustic wave device as claimed in claim 1, wherein a # 4 bearing is provided between the rotating disc and the gland for ensuring the relative rotation between the rotating disc and the gland.

8. The complex frequency same phase planar array directional transmitting acoustic wave device as claimed in claim 1, wherein the upper circumference of said rotating disk is sloped.

9. The complex frequency same phase plane array directional transmitting acoustic wave device as set forth in claim 1, wherein a mounting space of an upper half of said rotating disk is formed at a lower portion of said cover.

10. The complex frequency and phase planar array directional transmitting acoustic wave device according to any one of claims 1 to 9, further comprising a support, wherein the cylinder is mounted on an upper portion of the support.

Technical Field

The disclosure belongs to the field of energy transmission by using sound waves, and particularly relates to a complex frequency same-phase planar array directional sound wave transmitting device.

Background

Sound in the form of waves can transmit energy, conveying information, but it is generally difficult to transport substances over long distances.

The main parameters of acoustic transmission include intensity, directivity and frequency f or wavelength λ (λ ═ C)₀/f), propagation velocity C of acoustic waves in air₀Is about 340 m/s. The intensity of the sound wave is divided into sound pressure intensity and power intensity; after the sound wave is emitted, the sound wave is diffused according to a spherical surface, the direction pointed by the sound source is taken as a main axis, and the ratio of the intensity of any point on a certain spherical surface away from the sound source to the intensity of the main axis is called a directivity function.

When one diameter is D_SThe circular plane acoustic wave of (2) can be divided into a near field and a far field in a propagation path after being transmitted, and the characteristics of the acoustic wave in the two fields are different. The near field and the far field have no strict interface, and the distance L between the boundary and the sound source₀Generally calculated using one of the following formulas:

or

The sound wave is divided into a point source and a surface source according to the emitting sound source if the plane size D of the sound wave emitting device_SThe wave length is far less than the wavelength lambda, the wave length is approximate to a point source, point source sound waves are diffused in the space according to the global surface, and no directivity exists. The directivity of the surface source sound wave is related to the size thereof and has a diameter D_SThe far field half diffusion angle theta of the circular surface source sound wave is as follows:

when diffusion half angle theta<The sound waves are diffused by a spherical crown at 90 degrees, and are arranged at a distance L from a sound source under the condition that the sound waves are uniformly distributed on the spherical crown surface_S(L_S>>L₀) The intensity attenuation η is:

in the formula (I), the compound is shown in the specification,respectively sound wave at L_SAnd L₀The sound pressure value of (c). In the process of transmitting sound waves, the higher the frequency is, the better the directivity is, but the larger the air attenuation rate is, the poorer the capacity of transmitting energy in a long distance is; the lower the frequency, the lower the air attenuation rate, but the poorer the directivity, the poorer the ability to transmit energy over long distances.

The acoustic parametric array theory developed by nonlinear acoustics since the middle of the last century shows that, by utilizing the nonlinear characteristic of sound waves propagating in a medium, two fundamental frequency waves (the frequencies of the two fundamental frequency waves are f respectively) propagating along the same direction₁And f₂And f is₁>f₂) In the far field, a difference frequency wave (frequency f of the difference frequency wave) can be obtained_d＝f₁-f₂) And sum frequency wave (f)₁+f₂). The frequency of the frequency is high and is attenuated quickly; the frequency of the difference frequency is low, the attenuation is slow, and the propagation reaches the length L of the acoustic parametric array_0CThe intensity is at a maximum and then gradually decays. Acoustic parametric array length L_0CCalculated according to the following formula:

in the formula, alpha_aThe attenuation coefficient of sound waves in air is related to the frequency of the sound waves, the air pressure and the humidity. When f is₁＝2f₂Then f is_d＝f₁-f₂＝f₂Directivity function D of acoustic parametric array_ΨComprises the following steps:

in the formula, D_ΨIs the ratio of the sound intensity at a position offset from the principal axis by an angle Ψ at the same distance to the sound intensity on the principal axis, α₁And alpha_dRespectively a high frequency wave f₁Sum and difference frequency wave f_dAttenuation coefficient in air, λ_dIs the wavelength of the difference frequency wave, D_ΨThe faster the attenuation with Ψ, the better the directivity. When the sound intensity is attenuated 1/2 (i.e. D)_Ψ0.5), its divergence half-angle is defined as Ψ_C。

Research shows that for surface source sound waves with the same effective diameter, the array-type arranged multi-point independent sound sources (array elements) have better directivity than a single transmitting device (such as a piston type sound source). The sound waves emitted by each array element must be ensured to be in the same phase, if the phases are different, the sound waves are mutually superposed to offset part of emitted energy, and the transmission of effective energy is reduced.

For some special purpose sound wave generating devices, such as artificial rain enhancement devices, etc., large-power and high-directivity remote energy transmission is required.

The device for transmitting energy by sound waves is applied to various industries, such as a boiler soot blower (Huang Lei et al, utility model patent, publication No. CN205481049U, which discloses a dynamic and static ring type low-frequency high-power sound wave soot blower), an airport bird repelling device (Matou Tree et al, invention patent application, publication No. CN109430237A, which discloses a bird repelling device using an impulse wave generating device), an anti-terrorism riot repelling device (https: v zhuanlan.zhuhu.com/p/30291102), an artificial rain increasing device and the like (HuangRuizjun, invention patent application, publication No. CN106613576A, which discloses a cluster sound wave rain increasing device). In various devices, firstly, larger power needs to be provided, but the requirement on directivity is not high; secondly, proper frequency needs to be controlled; thirdly, strong power and good directivity are required; the technical requirement is highest, and the power is strong and the directivity is strong so as to realize the long-distance energy transmission. The device for transmitting energy by sound waves can be divided into two types of electric drive (Yangjun CN 101719368B) and air drive (Matou Bao tree et al, invention patent application, publication number: CN109430237A) according to the driving energy. The electric energy driving type device can be designed into a planar array type, the equivalent diameter of the device can be larger, for example, the frequency of the device with array elements formed by piezoelectric ceramic components can also reach very high, namely, the directivity of the device is good, but the transmission power of the device is limited due to the performance limitation of electric components. The air-driven type device only needs an air compressor with enough power to provide high-pressure air, the power of the air-driven type device can be very large, and the key problem is how to realize long-distance energy transmission with good directivity at lower frequency (smaller attenuation rate).

Disclosure of Invention

The present disclosure is directed to solving one of the problems set forth above.

Therefore, the directional transmitting acoustic wave device with low frequency and high directivity of the complex frequency and the same phase planar array provided by the embodiment of the disclosure comprises:

a cylinder;

the driving component is arranged in the cylinder, and the output end of the driving component is connected with a central shaft;

the fixed disc is sleeved on the central shaft and is fixedly connected with the upper opening of the cylinder to form an upper seal of the cylinder, holes are punched on the fixed disc at equal intervals along the radial direction, and a plurality of air holes are uniformly distributed on the circumference with the equal difference diameter;

the rotating disc is sleeved on the central shaft, is positioned on the fixed disc and is driven to rotate by the driving part, a plurality of air injection holes corresponding to the vent holes in the radial direction are arranged on the rotating disc, and the number of the air injection holes on each circumference is different from that of the vent holes so as to generate a complex frequency; and

and the gland bush is sleeved on the central shaft, is positioned on the rotating disc and is fixedly connected with the upper opening of the cylinder.

The complex frequency same-phase planar array directional transmitting sound wave device provided by the embodiment of the disclosure has the following characteristics and beneficial effects:

the complex frequency same-phase planar array directional transmitting sound wave device provided by the embodiment of the disclosure utilizes the driving part to drive the rotating disk to rotate, high-pressure gas in the cylinder is sprayed when the hole sites of the rotating disk and the fixed disk correspond, and the vent holes are sealed when the hole sites of the rotating disk and the fixed disk are staggered to generate primary high-pressure gas pulse. The hole site distribution of the fixed plate determines the planar array form of the device, each hole is equivalent to a transmitting unit (array element) of an electric driving type; the hole position arrangement of the rotating disk reflects the frequency of the generated sound waves, and if the rotating speed of the motor is N and M holes are uniformly distributed on the circumference of the rotating disk, the frequency of the sound waves is M multiplied by N, so that the higher sound wave frequency can be obtained at the lower rotating speed of the rotating disk. The sound wave generated by the device disclosed by the invention is directly emitted in a planar array form; the jet holes are arranged at equal intervals in the radial direction and rotate on the plane of the rotating disc, so that the same phase of sound waves is ensured; the acoustic parametric array generated by the complex frequency sound wave greatly improves the directivity of the low frequency sound wave. Therefore, the device of the present disclosure can realize the long-distance directional transmission of the large-energy sound wave.

In some embodiments, the distribution of the air injection holes on the rotating disk is designed according to the principle of an acoustic parametric emission array, that is, each air injection hole forms a sound source, all the sound sources are divided into two or more groups with different frequencies and distributed at intervals, the local frequency sound wave of each group of sound sources propagates at a corresponding diffusion angle in a near field, and forms a difference frequency sound wave among the groups in a far field.

In some embodiments, the cylinder includes a cylinder body having an inverted trapezoidal cross section and an intake pipe communicating with a bottom of the cylinder body; the last mouth of cylinder main part is equipped with and is used for fixed connection the last ring of fixed disk, go up the ring with be equipped with the sealing strip between the cylinder main part.

In some embodiments, a guide cone having an inverted cone shape is disposed below the motor in the cylinder body.

In some embodiments, the central shaft is a stepped shaft, a first through hole for the output end of the driving part to pass through is formed in the middle of the central shaft, and the first through hole is matched with the output end key groove of the driving part; the central shaft is respectively connected with the gland and the fixed disc through a 1# bearing and a 2# bearing, and the central shaft is matched with the rotating disc key groove.

In some embodiments, a # 3 bearing is arranged between the fixed disc and the rotating disc and used for ensuring the relative rotation between the fixed disc and the rotating disc, an installation space of the lower half part of the rotating disc is formed on the upper surface of the fixed disc, a driving part installation block is arranged at the center of the lower plane of the fixed disc, and a second through hole for the output of the driving part to pass through is formed in the middle of the driving part installation block.

In some embodiments, a # 4 bearing is provided between the rotating disk and the gland for ensuring relative rotation between the rotating disk and the gland.

In some embodiments, the upper circumferential edge of the rotating disk is sloped.

In some embodiments, a mounting space of an upper half of the rotating disk is formed at a lower portion of the gland.

In some embodiments, the complex frequency and same phase planar array directional transmitting acoustic wave device provided by the present disclosure further includes a support, and the cylinder is mounted on an upper portion of the support.

Drawings

Fig. 1 is an overall layout diagram of a complex frequency in-phase planar array directional transmitting acoustic wave device according to an embodiment of the present disclosure.

FIG. 2 is a schematic cross-sectional view of a cylinder in an apparatus according to an embodiment of the disclosure.

Fig. 3 (a) and (b) are a schematic cross-sectional view and a top view, respectively, of an upper orifice ring of a cylinder in an apparatus according to an embodiment of the present disclosure.

Fig. 4 (a) and (b) are a top view and a cross-sectional schematic view, respectively, of a central shaft of an apparatus according to an embodiment of the disclosure.

Fig. 5 (a) and (b) are a schematic sectional view and a top view, respectively, of a stationary disk in an apparatus according to an embodiment of the present disclosure.

Fig. 6 (a) and (b) are a top view and a schematic cross-sectional view, respectively, of a rotary disk in an apparatus according to an embodiment of the disclosure.

Fig. 7 (a) and (b) are a schematic cross-sectional view and a top view, respectively, of a gland in an apparatus according to an embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

On the contrary, this application is intended to cover any alternatives, modifications, equivalents, and alternatives that may be included within the spirit and scope of the application as defined by the appended claims. Furthermore, in the following detailed description of the present application, certain specific details are set forth in order to provide a better understanding of the present application. It will be apparent to one skilled in the art that the present application may be practiced without these specific details.

The overall arrangement of the complex frequency same-phase planar array directional transmitting sound wave device provided by the embodiment of the disclosure is shown in fig. 1, and the main components comprise an air cylinder A, a central shaft B, a fixed disc C, a rotating disc D and a gland E; and an accessory bracket F, motors G and 1#, 2#, 3#, and 4# bearings H1-H4. As shown in figure 1, a cylinder A is arranged on the upper part of the bracket F, a fixed disk C is arranged at the upper opening of the cylinder A and becomes the upper seal of the cylinder A, and a rotating disk D and a gland E are sequentially arranged on the upper part of the fixed disk C by taking a central shaft B as a base. The motor C is positioned in the center of the interior of the cylinder A and is installed on the lower portion of the fixed disk C, an output shaft of the motor C drives the rotating disk D to rotate through the central shaft B and the corresponding bearing, and the fixed disk C and the gland E are always fixed in the rotating process of the rotating disk D.

The specific implementation and functions of the components in the disclosed embodiments are described below:

the bracket F is formed by welding angle steel and can be fixedly arranged on the ground or other stable components as a basic supporting platform of the device disclosed by the invention.

Structure of the cylinder a referring to fig. 2 schematically, the cylinder a includes a cylinder body having an inverted trapezoidal cross section and an intake pipe a4 communicating with a bottom of the cylinder body. The upper part of the cylinder body is open and comprises a side wall A2, a bottom plate A3 and an upper ring A1 positioned at the top of the side wall A2 which are connected in a welding way. The upper end of air inlet pipe A4 welds in the center department of bottom plate A3, and the welding of the lower extreme of air inlet pipe A4 has flange A5, communicates with the pipeline of outside air compressor (outside air compressor and its pipeline are not shown in the figure) through this flange A5, for this device provides stable high-pressure air supply. And the cylinder A is fixedly connected with a fixed disc C through an upper ring A1.

Referring to fig. 3 (a), (b) (in order to more clearly reflect the structural features of the upper ring A1, (a) and (b) are not drawn to the same scale in fig. 3), the upper ring A1 of the cylinder a is an annular steel ring A1a, and a plurality of screw holes A1b for fixedly connecting with the fixed disk C are uniformly distributed on the circumference of the annular steel ring A1 a. A sealing groove A1c is arranged at the inner circumferential surface close to the annular steel ring A1a, and a sealing strip is arranged in the sealing groove to seal and seal the air of the air cylinder A.

Further, referring to fig. 2, in order to overcome the outward thrust of the high pressure gas in the cylinder a, a reinforcing rib a7 is provided in the cylinder body, a reinforcing rib a7 is screwed into the mounting screw hole of the fixing plate C through the upper end to form a stable connection relationship with the fixing plate C, the lower end of the reinforcing rib a7 passes through the bottom plate A3 of the cylinder body and is tightened with a nut, and the fixing plate C of a large plane is not deformed when being pressed by providing the reinforcing rib a 7.

Further, referring to fig. 2, in order to guide the high-pressure airflow in the cylinder a to smoothly flow upward and sequentially pass through the holes formed in the fixed disk C, the rotating disk D, and the gland E, a diversion cone a6 is disposed on the reinforcing rib a7 in the cylinder body and below the motor G, the diversion cone a6 is in an inverted cone shape, and both the upper and lower parts are open structures (the lower opening is small, and a small amount of airflow can be guided to enter the diversion cone to cool the motor G).

Referring to (a) and (B) of fig. 4, a central shaft B is coaxially arranged with an output shaft of a motor G, and a 1# bearing H1, a 2# bearing H2, a fixed disc C, a rotating disc D and a gland E are sleeved on the central shaft B, so that the installation of the 1# bearing H1, the 2# bearing H2, the fixed disc C, the rotating disc D and the gland E is realized. The central shaft B is a stepped shaft, a through hole B9 is formed in the middle of the central shaft B, and a first key groove B1 is formed in the side wall of the through hole B9 along the axial direction of the central shaft B and is used for being matched with an output shaft of the motor G; a first cylindrical surface B2 matched with an inner ring of a 1# bearing H1, a first shaft shoulder B3 used for limiting the lower plane of the 1# bearing H1, a second key groove B4 matched with the rotating disc D, a boss B5 positioned on the lower plane of the rotating disc D, an upper plane B6 used for limiting a 2# bearing H2 and a second cylindrical surface B7 matched with an inner ring of a 2# bearing H2 are formed in the middle of the outer side wall of the central shaft B from top to bottom; the boss B5 is also provided with a lubricating oil filling hole B8 which can be used for filling oil for the No. 2 bearing H2.

Referring to fig. 5 (a), (b) (in order to more clearly reflect the structural features of the stationary platen C, fig. 5 (a) and (b) are not drawn to the same scale), the stationary platen C is integrally a disk-shaped, is located above the cylinder a, and becomes the upper sealing structure of the cylinder a. The fixed disk C is provided with a plurality of screw holes C5 close to the outer circumference and matched with the screw holes A1b in the cylinder A. A convex spigot C1 is formed on the inner side of the fixed disk C adjacent to the screw hole C5, an installation seat C4 of a 2# bearing H2 is arranged at the center of the fixed disk C, a through hole for the central shaft B to pass through is formed in the middle of the installation seat C4, a lower annular installation groove C3 of a 3# bearing H3 is arranged between the convex spigot C1 of the fixed disk C and the installation seat C4, an installation space C2 of the lower half part of the rotating disk D is formed on the upper surface of the fixed disk C between the convex spigot C1 and the installation seat C4, and the convex spigot C1, the installation groove C3, the installation seat C4 and the fixed disk C are arranged in a concentric mode. The center of the lower plane of the fixed disc C is fixed with a motor mounting block, the motor mounting block and the fixed disc C are arranged concentrically, the center of the motor mounting block is provided with a through hole used for penetrating through an output shaft of a motor G, two sides of the motor mounting block are provided with screw holes C7 used for mounting the motor G, the bottom of the motor mounting block is covered by a spigot C8, and the spigot C8 is used for concentrically mounting and positioning the motor G. Furthermore, the lower surface of the fixed disk C is provided with an installation screw hole C6 of the reinforcing rib A7, and the top end of the reinforcing rib A7 can be screwed into or out of the installation screw hole C6, so that the reinforcing rib A7 can be installed and detached.

The fixed disk C is radially outwardly arranged from the center at equal intervals d_xN vent holes C9 are opened. The plane and the section shape of the vent hole C9 can be optimally designed according to the fluid mechanics principle, and the diameter of the vent hole C9 is set to be D in the embodiment_kThe area of a single hole of the round vent hole is 3.14D_k ²/4. Initial vent hole distance from center d₀The outermost vent hole is located away from the center Rs (equivalent circular diameter Ds). A row of N hole sites in the radius direction are positioned on the circular plane on which the upper surface of the fixed disk C is positioned according to equal central anglesRotationally distributed to form M × N concentric circular-ring-shaped distributed air holes

Specifically, in the embodiment of the present disclosure, the diameter of the fixed disk C is 1000mm, the pitch dx of the uniformly arranged vent holes C9 is 35mm, and the distance d from the initial vent hole (i.e., the vent hole closest to the center of the fixed disk C) to the center of the fixed disk C is taken as the distance d₀D are 11 diameters along the radial direction of the fixed disk C which is 85mm_kAnd 5mm of vent holes, the distance between the outermost holes and the center Rs is 435 mm. Central angle of concentric ring distribution hole siteAt 22.5 deg., each ring has 16 ventilation holes. The circular plane of the upper surface of the fixed disc C is provided with 176 ventilation holes in total to form an equivalent diameter D_SThe effective area of all the vent holes accounts for 0.581 percent of the area of the circular plane with the equivalent diameter, namely the plane of the 870mm air injection circle.

Referring to (a), (B) of fig. 6 (in fig. 6, (a) and (B) are not drawn to the same scale in order to more clearly reflect the structural features of the rotating disk D), the rotating disk D is disk-shaped as a whole, is located above the fixed disk C, and is rotatable about the central axis B relative to the fixed disk C. The center of the rotating disk D is provided with a through hole D4 for the central shaft B to pass through, and the side wall of the through hole D4 is provided with a boss D6 matched with the first key groove B1 of the central shaft B, so that the rotating disk D is fixedly connected with the central shaft B. The rotating disc D is also provided with an upper annular mounting groove D3 of a 3# bearing H3 and a lower annular mounting groove D2 of a 4# bearing H4 at intervals; the annular mounting groove D3 is arranged opposite to the mounting groove C3 on the fixed disc C, the annular mounting groove D3 and the mounting groove C3 are matched with each other to realize the mounting of a 3# bearing H3, and the relative rotation between the rotating disc D and the fixed disc C is realized through the 3# bearing; the annular mounting groove D2 is located on the upper surface of the rotating disk D and is used for matching with the gland E to realize the relative rotation between the rotating disk D and the gland E. Further, in order to reduce the moment of inertia of the rotating disk D during operation and thereby reduce the shaking and vibration of a rotating system composed of the rotating disk D and the central shaft B, etc., the upper circumferential edge of the rotating disk D is cut into a slope D5; in addition, in order to further reduce the moment of inertia of the rotating disk D during operation, the rotating disk D may be made of aluminum alloy or titanium alloy with a smaller mass, and the dynamic balance of the rotating system may be strictly checked. And a lubricating oil filling through hole D7 is formed at the position where the installation groove D3 is arranged below the rotating disk D and is used for adding lubricating oil to the 3# bearing H3. When the gas injection holes on the rotating disc correspond to the vent holes on the fixed disc, high-pressure gas is injected, and when the gas injection holes and the vent holes are staggered, the vent holes are closed, so that one-time high-pressure gas pulse is generated. The diameter, the starting point distance and the radial hole position arrangement of the air injection holes D1 of the rotating disk D are all the same as those of the vent holes C9 of the fixed disk C, but the distribution of the air injection holes D1 along the circumference is different as follows:

the distribution of the air injection holes D1 on the rotating disk D is designed according to the principle of an acoustic parametric emission array, namely, each air injection hole D1 forms a sound source, all the sound sources are divided into two groups or a plurality of groups with different frequencies, the sound waves of the local frequency of each group of sound sources are distributed at intervals, the sound waves of the local frequency of each group of sound sources are spread in a near field at a small diffusion angle, and difference frequency sound waves among the groups are formed in a far field. Taking a distribution mode of the example as an example: in 3 concentric rings of the No. 1, the No. 4 and the No. 7, the distribution angle of the holes is 22.5 degrees, namely, each ring is provided with 16 gas injection holes; the distribution angle of 4 concentric circular ring holes of 2 nd, 5 th, 8 th and 10 th is 11.25 degrees, and each circular ring is provided with 32 gas injection holes; the distribution angle of 4 concentric rings of holes in the numbers 3, 6, 9 and 11 is 5.625 degrees, and each ring is provided with 64 gas injection holes. The 3 kinds of distribution form the distribution with 16 gas injection holes as base numbers and the equal specific hole numbers of 32 holes (2 times) and 64 holes (4 times) in a concentric circle, and the equivalent diameter D is_S432 air injection holes are totally arranged on an air injection circular plane of 870mm in batches and are used for generating sound by air injection in turn.

Referring to fig. 7 (a) and (b), the gland E is integrally disc-shaped, and is located above the rotating disk D, and the radius of the gland E is the same as that of the fixed disk C. The center of the gland E is provided with a shaft hole E4 for a central shaft B to pass through and an installation groove E6 for installing A1 # bearing H1, a screw hole E1 corresponding to the screw hole A1B of the upper ring A1 and the screw hole C5 of the fixed disc C is arranged at the position of the gland E close to the outer circumferential surface, a female spigot E7 is formed at the lower part of the gland E close to the inner side of the screw hole E1, the female spigot E7 is matched with the male spigot C1 at the upper part of the fixed disc C, the upper ring A1, the fixed disc C and the gland E are fixedly connected through the screw holes A1B, C5 and E1, an installation space E5 for accommodating the upper half part of the rotating disc D is formed at the lower part of the gland E, and the installation space E5 is arranged opposite to the installation space C2 for accommodating the lower half part of the rotating disc D on the fixed disc C. An upper annular mounting groove E2 which is arranged opposite to the annular mounting groove D2 on the rotating disc D is further arranged at the lower part of the gland E, and the upper annular mounting groove E2 and the annular mounting groove D2 are matched to realize the mounting of the No. 4 bearing; meanwhile, a lubricating oil filling through hole E4 for filling lubricating oil is opened in the annular mounting groove E2.

The motor G is positioned in the cylinder A and provides power for the device, and a rotating system consisting of the central shaft B and the rotating disk D is driven to rotate. The motor is fixedly arranged in the center of the lower part of the fixed disc C, and concentric and directional positioning is realized through a tongue-and-groove C8 of the fixed disc C.

The device disclosed by the invention takes a fixed disk C as a positioning reference, an installation seat C4 of a 2# bearing H2 is arranged on the upper plane of the center of the fixed disk C, the lower plane of the 2# bearing H2 is matched with a bearing seat C4 of the fixed disk C, and the upper plane is matched with the lower plane B6 of a boss of a central shaft B; the lower plane of the rotating disk D is positioned on the upper plane B5 of the boss of the central shaft B, a 3# bearing H3 is arranged between the lower plane of the rotating disk D and the upper plane of the fixed disk C, and the distance between the lower plane of the rotating disk D and the upper plane of the fixed disk C is kept about 0.5 mm. A1 # bearing H1 and a 4# bearing H4 are arranged between the rotating disk D and the gland E, and the rotating disk D stably runs when rotating at a high speed. The positioning spigots C1 and E7 arranged on the outer sides of the fixed disk C and the gland E can ensure that the fixed disk C and the gland E are concentric, and the rotating disk D is ensured to be concentric through a central shaft.

Specifically, in this embodiment, the rotation frequency of the motor G is set to f₀Hz, when the rotating disk D rotating synchronously with the motor G rotates for 1 circle, the air injection holes D1 on the rotating disk D are matched with the vent holes on the fixed disk C for opening for 16 times, 32 times and 64 times respectively, namely, the vent holes on the fixed disk C can synchronously generate 16 xf₀ Hz、32×f₀Hz and 64 xf₀High voltage pulsed sound wave at Hz. The actual frequencies of the air injection holes D1 are respectively the low frequencies f when the rotating frequency of the motor G is 10Hz₁160Hz, medium frequency f 320Hz, high frequency f₂＝640Hz。

The difference frequency wave f of the first acoustic quantity array generated by matching the low frequency 160Hz and the medium frequency 320Hz_d1160 Hz; the second generation by matching the medium frequency of 320Hz and the high frequency of 640HzDifference frequency wave f of two-sound quantity array_d2320 Hz. The directivity of the acoustic parametric array thus produced is good. At the end of the second acoustic parametric array, the sound intensity of the high frequency wave is greatly attenuated, and the difference frequency wave f_d2The sound intensity of the first acoustic parametric array reaches the maximum value, and then the difference frequency wave f of the first acoustic parametric array_d1Generating a new third acoustic parametric array with high frequency of 320Hz and frequency f of difference frequency_d3＝160Hz。

Calculating a second acoustic parametric array acoustic wave (difference frequency wave f) by equation (5)_d2320Hz) divergence half angle Ψ_C2.47 DEG and calculates the length L of the acoustic parametric array by the equation (4)_0C313m, the diameter D of the end plane (virtual plane) of the second acoustic parametric array can be calculated_SX27.0 m. Third acoustic parametric array (difference frequency wave f)_d3160Hz) will be spread on the virtual plane of the second acoustic parametric array, starting from which the divergence half-angle Ψ, calculated according to equation (5), starts_C2.14 °, length L calculated as (4)_0C839m, the radius of the third acoustic parametric array is D_SX31.4 m. The difference frequency wave of the third acoustic parametric array is 160Hz (wavelength 2.13 m). The divergence half angle from the third acoustic parametric array to the outside is 2.37 degrees calculated according to the formula (2), the divergence radius is increased by 48.1m at the position of 2000m, and the sound wave area is about 20000m²。

In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present disclosure have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined by the claims and their equivalents.