Acoustic array sound insulation device suitable for being carried by unmanned aerial vehicle and design method of acoustic array sound insulation device

Abstract

The invention discloses a sound array sound insulation device suitable for being carried by an unmanned aerial vehicle and a design method thereof.The sound array sound insulation device comprises a sound insulation cover, a sound sensing array is arranged in the sound insulation cover, and the sound sensing array comprises a fixing plate, a sound sensor and an array accessory; the array accessory comprises part or all of a power supply board card and a signal transmission module, the fixing plate is fixed in the acoustic shield and divides the acoustic shield into a front cavity and a rear cavity, the acoustic sensors are arranged on the surface of the cavity, close to the front side, of the fixing plate in an array mode, and the array accessory is installed on the surface of the cavity, close to the rear side, of the fixing plate. The invention aims to provide a sound insulation scheme suitable for the sound array carried by the unmanned aerial vehicle for the noise characteristics and typical discharge defect noise characteristics of the unmanned aerial vehicle, so as to reduce the influence of the noise of the unmanned aerial vehicle on the measurement and improve the capacity of the sound array carried by the unmanned aerial vehicle for identifying the discharge defect of the power transmission line.

Description

Technical Field

[0001] The invention belongs to the technical field of acoustic measurement, and in particular relates to an acoustic array sound insulation device suitable for being carried by an unmanned aerial vehicle and a design method thereof. Background Art

[0002] Transmission lines are an important part of the power system and an important object for daily operation and maintenance of power companies. Abnormal discharge is a common phenomenon caused by defects in transmission lines, such as dirty and damaged insulators, broken strands of transmission lines, etc. When discharge occurs, physical changes such as heat and sound will occur at the same time. Therefore, infrared imaging, ultrasound, acoustic array imaging and other technologies are usually used for monitoring, mainly operated by handheld instruments. Drones are increasingly used in substation and transmission line inspections due to their convenience and speed. At present, it is common for drones to carry optical equipment such as infrared imaging and visible light, while drones equipped with acoustic arrays for discharge point positioning are in the initial stage. The main reason is that the rotor noise of drones has the characteristics of high sound pressure level and wide distribution frequency, which has a greater adverse effect on the acoustic array positioning of abnormal discharge points on transmission lines. Therefore, how to achieve acoustic array sound insulation suitable for drones has become a key technical problem that needs to be solved urgently. Summary of the invention

[0003] Technical problem to be solved by the present invention: In view of the above-mentioned problems in the prior art, an acoustic array sound insulation device suitable for use on drones and a design method thereof are provided. The present invention aims to provide an acoustic array sound insulation solution suitable for use on drones based on the noise characteristics of drones and typical discharge defect noise characteristics, so as to reduce the impact of drone noise on measurement and enhance the ability of drone-mounted acoustic arrays to identify discharge defects in transmission lines.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: A sound array sound insulation device suitable for being carried by an unmanned aerial vehicle comprises a sound insulation cover, wherein a sound sensor array is arranged inside the sound insulation cover, wherein the sound sensor array comprises a fixing plate, a sound sensor, and an array accessory, wherein the array accessory comprises a power supply board and part or all of a signal transmission module, wherein the fixing plate is fixed in the sound insulation cover and divides the sound insulation cover into two front and rear cavities, wherein the number of the sound sensors is plural and they are arranged in an array on a cavity surface on the front side of the fixing plate, and the array accessory is mounted on a cavity surface on the rear side of the fixing plate.

[0005] Optionally, the sound insulation cover is installed in front of the UAV obliquely downward with a vertical pitch angle of 45 degrees, and the vertical pitch angle is the angle between the axis of the sound insulation cover and the horizontal plane of the UAV.

[0006] Optionally, a bell mouth is provided at the front opening edge of the soundproof enclosure, the cross section of the outer side of the bell mouth is an arc, and the center of the arc is located at the farthest side point P of the unmanned aerial vehicle's rotor deployment, and the following constraints are satisfied: , in, It is the line segment between the farthest point P of the rotor deployment and the end point C of the bell mouth opening. It is the line segment between the opening edge point B at the lower front end of the soundproof enclosure and the end point C of the bell mouth opening. It is the line segment between the farthest point P of the rotor deployment and the opening edge point B at the front lower side of the sound insulation cover. The wavelength corresponding to the lowest frequency of acoustic array imaging.

[0007] Optionally, the array arrangement refers to a plurality of acoustic sensors being arranged in a plurality of concentric circular rings.

[0008] Optionally, a camera is arranged at the center of the circular ring on the fixing plate.

[0009] Optionally, the sound insulation cover is made of hard sound insulation material.

[0010] Optionally, the inner wall of the soundproof enclosure is wrapped with a sound insulation material layer, the outer wall is wrapped with a sound absorption material layer, and the rear cavity of the soundproof enclosure is filled with sound absorption material.

[0011] Optionally, the sound absorbing material is damping sound insulation felt or polyester fiber sound absorbing cotton.

[0012] The present invention also provides a rotary wing UAV, comprising a UAV body, wherein a suspension connecting rod is provided at the lower side of the UAV body, and the aforementioned sound array sound insulation device suitable for being carried by the UAV is installed and fixed on the suspension connecting rod.

[0013] The present invention also provides a design method for the aforementioned acoustic array sound insulation device suitable for use on a drone, comprising the following steps: S1, determining the outer shell size of the sound insulation enclosure according to the outer contour of the sound sensor array; S2, determine the depth of the rear cavity of the soundproof enclosure according to the size of the array accessories; S3, determining the depth of the front cavity of the sound insulation enclosure according to the viewing angle of the camera; S4, determine the vertical pitch angle of the soundproof enclosure; S5, with the farthest point P of the drone's rotor deployment as the center of the circle and the outer edge of the front opening of the soundproof cover as the starting point A, draw an arc line with a specified central angle as the outer wall of the bell mouth and meet the following constraints: , in, It is the line segment between the farthest point P of the rotor deployment and the end point C of the bell mouth opening. It is the line segment between the opening edge point B at the lower front end of the soundproof enclosure and the end point C of the bell mouth opening. It is the line segment between the farthest point P of the rotor deployment and the opening edge point B at the front lower side of the sound insulation cover. The wavelength corresponding to the lowest frequency of the acoustic array imaging is determined, and the opening of the bell mouth is connected with the inner edge of the front opening of the soundproof enclosure to form a complete cross section of the bell mouth, thereby determining the structure of the bell mouth; S6, according to the height of the drone fuselage and the ground and the size of the soundproof cover when the drone is parked, determine the installation position of the soundproof cover and the suspension connecting rod, so that the distance d between the lower part of the soundproof cover and the ground when the drone is parked is not less than the preset safety distance; S7, determine the hard sound insulation material of the sound insulation cover; S8, determining the material and thickness of the sound insulation material layer wrapped on the inner wall of the sound insulation cover and the sound absorption material layer wrapped on the outer wall, and determining the material and thickness of the sound absorption material filled in the rear cavity of the sound insulation cover; S9, judging whether the overall quality of the sound array sound insulation device meets the rated load index of the UAV. If the overall quality of the sound array sound insulation device does not meet the rated load index of the UAV, jumping to step S1 to adjust the design of the sound array sound insulation device, otherwise, judging that the design of the sound array sound insulation device is completed, ending and exiting.

[0014] Compared with the prior art, the present invention mainly has the following advantages: the present invention designs the sound insulation structure according to the difference and characteristics of the discharge defect noise spectrum and the drone noise spectrum, and uses the sound insulation principle. The drone noise spectrum is mainly medium and low frequency, and the discharge defect noise is mainly medium and high frequency. Therefore, the transmission line discharge acoustic array imaging (positioning) should use medium and high frequency sound wave signals, and use the strong directivity of high frequency sound to design the sound insulation structure through reasonable size relationship. While reducing the drone noise obtained by the acoustic sensor of the acoustic array, it does not affect the reception of the discharge point sound source noise, thereby improving the signal-to-noise ratio of the discharge acoustic signal obtained by the acoustic array, and realizing the positioning of the discharge sound source at a longer distance or lower intensity. Therefore, the present invention is oriented to the noise characteristics of drones and typical discharge defect noise characteristics, and provides a sound array sound insulation solution suitable for drones, which can reduce the impact of drone noise on measurement and improve the ability of drone-mounted acoustic arrays to identify transmission line discharge defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the installation structure of the acoustic array sound insulation device in an embodiment of the present invention.

[0016] Figure 2 Schematic diagram of the structure of the acoustic sensor array in an embodiment of the present invention.

[0017] Figure 3 Schematic diagram of the side structure of the sound insulation cover in the embodiment of the present invention.

[0018] Figure 4 Schematic diagram of the cross-sectional structure of the sound insulation cover in the embodiment of the present invention.

[0019] Figure 5 It is the sound pressure level 1m below the drone (DJI M300) at different heights in the embodiment of the present invention.

[0020] Figure 6 Schematic diagram of the design process of the acoustic array sound insulation device in an embodiment of the present invention.

[0021] Legend: 1. Soundproof cover; 11. Bell mouth; 2. Acoustic sensor array; 21. Fixing plate; 22. Acoustic sensor; 23. Array accessories; 24. Camera; 3. Drone body; 4. Suspension connecting rod. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] like Figure 1 , Figure 2 and Figure 3 As shown, the present embodiment provides an acoustic array sound insulation device suitable for use on a drone, including a sound insulation enclosure 1, an acoustic sensor array 2 is arranged inside the sound insulation enclosure 1, the acoustic sensor array 2 includes a fixing plate 21, an acoustic sensor 22, and an array accessory 23, the array accessory 23 includes part or all of a power board and a signal transmission module, the fixing plate 21 is fixed in the sound insulation enclosure 1 and divides the sound insulation enclosure 1 into two front and rear cavities, the number of the acoustic sensors 22 is multiple and they are arranged in an array on the cavity surface on the front side of the fixing plate 21, and the array accessory 23 is installed on the cavity surface on the rear side of the fixing plate 21.

[0024] In this embodiment, the soundproof cover 1 is installed in front of the drone diagonally downward with a vertical pitch angle of 45 degrees, and the vertical pitch angle is the angle between the axis of the soundproof cover 1 and the horizontal plane of the drone.

[0025] In order to suppress the impact of UAV aerodynamic noise, such as Figure 1As shown, in this embodiment, a bell mouth 11 (the "brim" at the front opening edge of the sound insulation cover 1) is provided at the front opening edge of the sound insulation cover 1, and the cross section of the outer side of the bell mouth 11 is an arc, and the center of the arc is located at the farthest side point P of the unmanned aerial vehicle's rotor deployment, and the following constraints are satisfied: , in, It is the line segment between the farthest point P of the rotor deployment and the end point C of the opening of the bell mouth 11, is a line segment between the opening edge point B at the lower front end of the soundproof enclosure 1 and the opening end point C of the bell mouth 11, It is the line segment between the farthest point P of the rotor deployment and the opening edge point B at the lower front end of the soundproof cover 1. is the wavelength corresponding to the lowest frequency of acoustic array imaging. Assuming that the desired acoustic imaging frequency range in this example is 10k~30k, then The value is 0.034m.

[0026] like Figure 2 As shown, in this embodiment, the array arrangement means that a plurality of acoustic sensors 22 are arranged in a plurality of concentric circular rings.

[0027] like Figure 2 As shown, in this embodiment, a camera 24 is arranged at the center of the circular ring on the fixing plate 21 .

[0028] In this embodiment, the sound insulation cover 1 is made of hard sound insulation material. In this embodiment, the hard sound insulation material is specifically made of 1.5mm aluminum alloy, which has the characteristics of light weight and good sound insulation performance.

[0029] In this embodiment, the inner wall of the soundproof enclosure 1 is wrapped with a sound insulation material layer, the outer wall is wrapped with a sound absorption material layer, and the rear cavity of the soundproof enclosure 1 is filled with sound absorption material. In this embodiment, the sound absorption material is damping sound insulation felt or polyester fiber sound absorption cotton.

[0030] like Figure 1 As shown, this embodiment also provides a rotary wing UAV, including a UAV body 3, a suspension connecting rod 4 is provided at the lower side of the UAV body 3, and the aforementioned sound array sound insulation device suitable for UAV is installed and fixed on the suspension connecting rod 4. The mass of the suspension connecting rod 4 is included in the overall mass of the sound array sound insulation device to meet the rated load limit requirement of the UAV.

[0031] Figure 5: The sound pressure level at 1 m below the drone (DJI M300) at different heights in this embodiment. The drone noise has an obvious logarithmic attenuation characteristic, and the telescopic stroke of the electric telescopic rod will affect the average signal strength collected by each acoustic sensor 22 in the acoustic sensor array 2. Similarly, the sound insulation cover 1 is installed in front of the drone diagonally downward and the vertical pitch angle will also affect the average signal strength collected by each acoustic sensor 22 in the acoustic sensor array 2. Therefore, as an optional implementation, the suspension connecting rod 4 in this embodiment is an electric telescopic rod (for example, a linear motor can be used), and an electric turntable with an encoder is provided on the suspension connecting rod 4. The electric turntable and the electric telescopic rod are respectively connected to a sound collection and adjustment controller. The sound collection and adjustment controller is used to control the electric turntable and the electric telescopic rod to adjust the height and angle of the sound array sound insulation device carried by the drone, and is connected to the drone for communication. The adjustment target is that the average value of the signal strength collected by each sound sensor 22 in the sound sensor array 2 reaches the maximum value. For example: S101, retract the electric telescopic rod to the initial state; S102, determine whether the electric telescopic rod reaches the maximum telescopic stroke, and if so, jump to step S104; otherwise, extend the electric telescopic rod to a preset telescopic stroke. long, jump to step S103; S103, control the electric turntable to rotate from the specified 0 degree position with a preset rotation step length, and each time it rotates to a position, obtain the average signal strength collected by each sound sensor 22 in the sound sensor array 2 through the drone, and record it in the triplet <telescopic stroke, rotation angle, signal strength average value>; if the electric turntable rotates one circle, jump to step S102; S104, find the triplet with the largest signal strength average value among all the triplet <telescopic stroke, rotation angle, signal strength average value>, and use the telescopic stroke and rotation angle therein as the optimal telescopic stroke and rotation angle, and control the electric turntable to rotate to the optimal rotation angle through the sound collection and adjustment controller, and control the electric telescopic rod to telescope to the optimal telescopic stroke and keep it fixed. In addition to the signal strength average value, other sound indicators can also be used as needed, such as using a noise separation algorithm to detect and separate various types of noise such as rotor noise and wind noise of the drone, and using the minimum noise as an indicator to select the optimal telescopic stroke and rotation angle, which can also achieve the above goals. It should be noted that the noise separation algorithm is an existing well-known method, and various machine learning methods using Mel-frequency cepstral coefficients (MFCC) and support vector machines (SVM), blind source separation (BSS) methods, adaptive noise blind separation algorithms (adaptive noise-blind separation, aNBS) methods, etc. can be adopted as needed.

[0032] like Figure 6As shown, this embodiment also provides a design method for the aforementioned sound array sound insulation device suitable for use on a drone, comprising the following steps: S1, determine the shell size of the sound insulation cover 1 according to the outer contour of the sound sensor array 2; assuming that the sound array is circular with a diameter of 10 cm, the cross-section of the shell of the sound insulation cover is preferably circular (it can also be optimized to a shape with less aerodynamic noise) with an inner diameter of 12 cm; S2, determining the depth of the rear cavity of the sound insulation enclosure 1 according to the size of the array accessories 23 (such as a power management board, a signal transmission module, etc.); S3, determine the depth of the front cavity of the soundproof enclosure 1 according to the viewing angle of the camera 24; in this embodiment, determine the front length according to the viewing angle of the optical sensor of the sound array. Preferably, at least 5 degrees of viewing angle (α) or at least 10 mm of reserved space is reserved for installing sound absorbing and insulating materials, such as Figure 4 As shown; S4, determining the vertical pitch angle of the soundproof cover 1; the direction of the soundproof cover is parallel to the front of the drone and obliquely downward, preferably 45 degrees below the horizontal, so as to achieve multi-angle detection by controlling the up and down, horizontal movement, and horizontal rotation of the drone, which is also beneficial to the design of the soundproof cover 1; S5, with the farthest point P of the drone's rotor spread out as the center of the circle and the outer edge of the front opening of the soundproof enclosure 1 as the starting point A, draw an arc line with a specified central angle as the outer wall of the bell mouth 11 and satisfy the following constraints: , in, It is the line segment between the farthest point P of the rotor deployment and the end point C of the opening of the bell mouth 11, is a line segment between the opening edge point B at the lower front end of the soundproof enclosure 1 and the opening end point C of the bell mouth 11, It is the line segment between the farthest point P of the rotor deployment and the opening edge point B at the lower front end of the soundproof cover 1. The wavelength corresponding to the lowest frequency of the acoustic array imaging is formed, and the opening of the bell mouth 11 is connected to the inner edge of the front opening of the soundproof cover 1 to form a complete cross section of the bell mouth 11, thereby determining the structure of the bell mouth 11; specifically, in this embodiment, according to the frontmost position of the front rotor of the drone (point P), a circular arc of 20° is drawn forward from point P along the upper edge position of the soundproof cover A to form the "brim" (bell mouth 11) of the soundproof cover 1 to further improve the sound insulation performance; S6, according to the height of the drone body and the ground and the size of the soundproof cover 1 when the drone is parked, determine the installation position of the soundproof cover 1 and the suspension connecting rod 4, so that the distance d between the lower part of the soundproof cover 1 and the ground when the drone is parked is not less than a preset safety distance; for example, the preset safety distance in this embodiment is 1 cm to prevent bumps; S7, determine the hard sound insulation material of the sound insulation cover 1; in this embodiment, the hard sound insulation material is specifically selected from 1.5mm aluminum alloy, which has the characteristics of light weight and good sound insulation performance; S8, determine the material and thickness of the sound insulation material layer wrapped on the inner wall of the soundproof cover 1 and the sound absorption material layer wrapped on the outer wall, and determine the material and thickness of the sound absorption material filled in the rear cavity of the soundproof cover 1; in this embodiment, the interior of the soundproof cover is filled with 1cm sound absorption and insulation material, the outer side is sound absorption material, and the inner side is sound insulation material. In this embodiment, 1mm sound insulation material and 8mm sound absorption material are preferred, such as environmentally friendly damping sound insulation felt and polyester fiber sound absorbing cotton; S9, determine whether the overall mass of the sound array sound insulation device meets the rated load index of the drone. If the overall mass of the sound array sound insulation device does not meet the rated load index of the drone, jump to step S1 to adjust the design of the sound array sound insulation device. Otherwise, it is determined that the design of the sound array sound insulation device is completed, and the process ends and exits. Through this step, the quality of each component is comprehensively considered to ensure that the overall mass of the sound insulation cover does not exceed the rated load of the drone. If it exceeds, consider replacing the drone, reducing the weight of the structure, and other methods to optimize the design.

[0033] The method for designing a sound array sound insulation device of this embodiment utilizes the spectrum difference between drone noise and discharge point noise, as well as the spatial position difference relative to the sound array, and adopts a combination of sound insulation and sound absorption to design a reasonable sound insulation structure. The beneficial effects are: (1) The method is fast in designing a sound insulation structure, with a clear process, low difficulty in implementation, and obvious effect. (2) The method has strong universality and can be applied to different application scenarios where sound arrays mounted on rotor drones require sound insulation treatment.

[0034] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A sound array sound insulation device suitable for use on drones, characterized in that: The invention comprises a soundproof enclosure (1), wherein a sound sensor array (2) is arranged inside the soundproof enclosure (1), wherein the sound sensor array (2) comprises a fixing plate (21), a sound sensor (22), and an array accessory (23), wherein the array accessory (23) comprises part or all of a power supply board and a signal transmission module, wherein the fixing plate (21) is fixed inside the soundproof enclosure (1) and divides the soundproof enclosure (1) into two front and rear cavities, wherein the sound sensors (22) are multiple in number and arranged in an array on a cavity surface on the front side of the fixing plate (21), and the array accessory (23) is mounted on a cavity surface on the rear side of the fixing plate (21).

2. The acoustic array sound insulation device suitable for use on drones according to claim 1, characterized in that: The sound insulation cover (1) is installed in front of the drone, obliquely downward, and has a vertical pitch angle of 45 degrees, wherein the vertical pitch angle is the angle between the axis of the sound insulation cover (1) and the horizontal plane of the drone.

3. The acoustic array sound insulation device suitable for use on drones according to claim 2, characterized in that: The front opening edge of the soundproof enclosure (1) is provided with a bell mouth (11), the outer side surface of the bell mouth (11) has an arc-shaped cross section, and the center of the arc is located at the farthest side point P of the unmanned aerial vehicle's rotor deployment, and the following constraints are satisfied: ， in, It is the line segment between the farthest point P of the rotor deployment and the end point C of the opening of the bell mouth (11), is a line segment between the opening edge point B at the lower front end of the soundproof enclosure (1) and the opening end point C of the bell mouth (11), It is the line segment between the farthest point P of the rotor deployment and the opening edge point B at the lower front end of the sound insulation cover (1). The wavelength corresponding to the lowest frequency of acoustic array imaging.

4. The acoustic array sound insulation device suitable for use on drones according to claim 1, characterized in that: The array arrangement refers to a plurality of acoustic sensors (22) being arranged in a plurality of concentric circular rings.

5. The acoustic array sound insulation device suitable for use on drones according to claim 4, characterized in that: A camera (24) is arranged at the center of the circular ring on the fixing plate (21).

6. The acoustic array sound insulation device suitable for use on drones according to claim 1, characterized in that: The sound insulation cover (1) is made of hard sound insulation material.

7. The acoustic array sound insulation device suitable for use on a drone according to claim 6, characterized in that: The inner wall of the soundproof cover (1) is wrapped with a sound insulation material layer, and the outer wall is wrapped with a sound absorption material layer, and the rear cavity of the soundproof cover (1) is filled with sound absorption material.

8. The acoustic array sound insulation device suitable for use on a drone according to claim 7, characterized in that: The sound absorbing material is damping sound insulation felt or polyester fiber sound absorbing cotton.

9. A rotary wing drone, comprising a drone body (3), characterized in that: A suspension connecting rod (4) is provided on the lower side of the drone body (3), and the sound array sound insulation device suitable for being carried by a drone as claimed in any one of claims 1 to 8 is mounted and fixed on the suspension connecting rod (4).

10. A design method for an acoustic array sound insulation device suitable for use on a drone as claimed in any one of claims 1 to 8, characterized in that: The steps include: S1, determining the outer shell size of the sound insulation cover (1) according to the outer contour of the sound sensor array (2); S2, determining the depth of the rear cavity of the sound insulation enclosure (1) according to the size of the array attachment (23); S3, determining the depth of the front cavity of the sound insulation enclosure (1) according to the viewing angle of the camera (24); S4, determining the vertical pitch angle of the sound insulation enclosure (1); S5, with the farthest point P of the unmanned aerial vehicle's rotor spread out as the center of the circle and the outer edge of the front opening of the soundproof cover (1) as the starting point A, draw an arc line with a specified central angle as the outer wall of the bell mouth (11) and satisfy the following constraints: ， in, It is the line segment between the farthest point P of the rotor deployment and the end point C of the opening of the bell mouth (11), is a line segment between the opening edge point B at the lower front end of the soundproof enclosure (1) and the opening end point C of the bell mouth (11), It is the line segment between the farthest point P of the rotor deployment and the opening edge point B at the lower front end of the sound insulation cover (1). The wavelength corresponds to the lowest frequency of the acoustic array imaging, and the opening of the bell mouth (11) is connected to the inner edge of the front opening of the soundproof cover (1) to form a complete cross section of the bell mouth (11), thereby determining the structure of the bell mouth (11); S6, determining the installation positions of the sound insulation cover (1) and the suspension connecting rod (4) according to the height of the drone body above the ground and the size of the sound insulation cover (1) when the drone is parked, so that the distance d between the lower part of the sound insulation cover (1) and the ground when the drone is parked is not less than a preset safety distance; S7, determining the hard sound insulation material of the sound insulation cover (1); S8, determining the material and thickness of the sound insulation material layer wrapped on the inner wall of the sound insulation cover (1) and the sound absorption material layer wrapped on the outer wall, and determining the material and thickness of the sound absorption material filled in the rear cavity of the sound insulation cover (1); S9, judging whether the overall quality of the sound array sound insulation device meets the rated load index of the UAV. If the overall quality of the sound array sound insulation device does not meet the rated load index of the UAV, jumping to step S1 to adjust the design of the sound array sound insulation device, otherwise, judging that the design of the sound array sound insulation device is completed, ending and exiting.

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