Dandelion-imitated structure slow-descent sound detection device

Abstract

The invention relates to a sound detection device, in particular to a slow-descent sound detection device with a dandelion-like structure, which comprises a crown hair storage module, a crown hair ejection module and a sound detector, the crown hair storage module is connected with one end of the crown hair ejection module, and the sound detector serves as an air-drop load and is connected with the other end of the crown hair ejection module. The crown hair storage module adopts a dandelion-like design, that is, a plurality of crown hairs made of flexible fibers are arranged in the storage module, and the crown hairs can be unfolded in the falling process in the air-drop process to form a buffer structure. The structure is in a dandelion crown hair-like umbrella shape, air resistance is increased by means of the flexible fibers to reduce speed, the structure can be flexibly deformed when encountering obstacles, the defect of winding of a rigid structure is avoided, and the sound detector can be effectively guaranteed to safely fall to the ground. The device is light and compact, does not damage the size and weight of the sensor, and meets the requirements of small and portable sound detection tasks.

Description

Technical Field

[0001] The invention relates to an acoustic detection device, in particular to a slow-falling acoustic detection device with a dandelion-like structure. Background Art

[0002] With the development of science and technology, acoustic detection technology has been widely used in many fields such as environmental monitoring, geological exploration and target identification. As the core component of the acoustic detection array, the performance of the acoustic detector directly affects the overall efficiency of the entire system. Traditional acoustic detectors are mostly fixed installation or wired connection, which has certain limitations in terms of application scope. First, the fixed deployment method has poor flexibility because it usually needs to determine the installation location in the early stage. When faced with emergencies or temporary tasks in scenarios such as natural disaster monitoring and environmental monitoring, this deployment method will expose great inconvenience. For example, in the natural disaster monitoring scenario, when it is necessary to monitor the newly emerging disaster area, the fixed acoustic detector is difficult to change its position quickly, so that the new monitoring area cannot be covered in time. Secondly, the monitoring range under the fixed deployment method has obvious limitations. Its monitoring range is usually constrained by the installation position and direction. In scenarios that require large-scale, multi-point monitoring, such as urban noise monitoring, fixed sound detectors are difficult to achieve full coverage and are likely to miss some important information. After all, they can only monitor the noise level in a specific area, and cannot dynamically adjust the monitoring points to achieve coverage of the entire city. Finally, fixed deployment is also accompanied by higher security risks. In some special application scenarios, such as monitoring the activity range of wild animals, fixed devices are easily detected and damaged by wild animals.

[0003] In recent years, wireless acoustic detectors have attracted much attention due to their advantages such as high flexibility and easy deployment. At the same time, the drone industry is in a state of rapid development. The method of using drones to airdrop acoustic detectors can effectively solve the inherent defects brought about by fixed installation or wired connection. However, this method of using drones to airdrop acoustic detection devices also faces a series of problems. When wireless acoustic detectors are dropped from drones, due to the lack of appropriate slow-down means, the detectors will fall at a faster speed and will carry greater kinetic energy when they land. The impact may not only damage the external packaging structure of the detector and interfere with the normal operation of the sensor, but also cause the destruction of the precision electronic components inside the detector, thereby reducing the detection efficiency of the entire acoustic array. In addition, hard surfaces such as concrete, cement, and gravel will further increase the risk of impact damage. Therefore, the development of an acoustic detector with a slow-down function is crucial to improving its reliability and service life. .

[0004] Existing slow-descent technologies mainly cover aspects such as parachutes, airbags, and rotors, and their principles are to reduce the falling speed, reduce the falling impact, and control the falling posture. However, these methods all have their own shortcomings. For example, although the parachute is effective in reducing the falling speed, it is easy to be entangled in a complex natural environment; although the airbag can effectively cushion the impact on the device when landing, it requires a large inflation space to be reserved, and the inflation process is relatively slow. It is very likely that the device has landed but the airbag has not been filled, resulting in damage to the device. If it is inflated in advance, it will occupy valuable airdrop space, reducing the number of single airdrops. The rotor requires a complex power system and a heavier power supply device, which undoubtedly increases the weight and cost of the equipment. These factors limit their applicability in specific application scenarios. Summary of the invention

[0005] In view of this, the present invention proposes a slow-descent acoustic detection device imitating a dandelion structure, which utilizes the characteristics of dandelion seeds and its unique pappus structure to generate stable airflow resistance in the air, thereby achieving slow descent and solving the inherent problem of damage to internal components of the instrument due to excessive impact caused by landing during the launch of the acoustic detector array by an unmanned aerial vehicle or manned aircraft.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] A dandelion-like structure slow-falling sound detection device, a pappus storage module, a harmonic sound detector, and a pappus ejection module;

[0008] The pappus storage module is arranged at one end of the pappus ejection module, including a central shaft, a rotating shaft is arranged at one end of the central shaft, a plurality of pappus are arranged on the rotating shaft along the circumference to form a pappus group, and the pappus group has two states of folding and unfolding, each pappus includes a free end and a fixed end connected to the rotating shaft, and a limiting structure for suppressing the deflection of the pappus is arranged at one end of the rotating shaft away from the central shaft;

[0009] The acoustic detector is arranged as a load at the other end of the pappus ejection module, and a second shell is provided on the outer surface of the acoustic detector, which is used to capture and process acoustic signals in the environment and transmit them to the remote terminal;

[0010] The pappus pop-up module includes a timing module, a release module, a first power module and a first shell; the timing module and the first power module are arranged in the first shell, the timing module includes a first communication module and a signal processor, the first communication module is used to transmit various instructions issued by the external device to the signal processor; the signal processor sets the time for airdrop according to the received instructions and automatically counts down, and when the countdown reaches the set time, sends the execution airdrop command to the release module; the release module is used to constrain the pappus to retract in the initial state, and drives the release module to pop out the pappus according to the received airdrop command; the first power module is used to power the processor and the first communication module.

[0011] Furthermore, the dandelion-like structured slow-descent sound detection device also includes a tail buffer device, which includes an airbag and a sealing cover for sealing the airbag, wherein the airbag is filled with a buffer solution or air, and an air inlet is provided on the sealing cover, through which the buffer solution or air flows; the sealing cover is detachably connected to the sound detection device.

[0012] Furthermore, the sealing cover is made of hard and light material, the airbag material is silicone rubber, and the buffer is made of silicone oil.

[0013] Furthermore, the release module includes a hollow cylinder and a ring. One end of the hollow cylinder has a bottom wall, which is fixedly connected to an end of the second shell away from the sound detector. One end of the ring is embedded in the other end of the cylinder and can move up and down along the inner wall of the hollow cylinder.

[0014] Furthermore, a pappus spacer is provided between two adjacent pappus, and the pappus spacer is consistent with the length of the pappus to prevent overlapping between the pappus and ensure that they are neatly arranged in the storage module, so that the pappus can be smoothly unfolded after being popped out, avoiding entanglement or jamming, thereby effectively improving the reliability and stability of the pappus unfolding, and ensuring that the detector can descend smoothly when falling.

[0015] Furthermore, the sound detector includes a microphone, a signal processing circuit, a storage module, a second communication module and a second power module; the microphone is used to capture acoustic signals in the environment and transmit them to the signal processing circuit, the signal processing circuit is used to amplify, filter and digitize the captured acoustic signals to obtain acoustic data and transmit them to the storage module and the second communication module respectively, the storage module is used to store acoustic data, the communication module is used to transmit the acoustic data to a remote terminal, and the second power module is used to power various components of the sound detector.

[0016] After adopting the above technical solution, the present invention has the following beneficial effects:

[0017] (1) The present invention imitates the design of dandelions and sets a number of pappus made of flexible fibers in the storage module. When airdropped, these pappus will unfold during the falling process to form a buffer structure. This structure is like an umbrella of dandelion pappus. It uses flexible fibers to increase air resistance to reduce speed. It can flexibly deform when encountering obstacles, avoiding the disadvantages of rigid structure entanglement, and can effectively ensure the safe landing of the acoustic detector. It is also light and compact, without damaging the volume and weight of the sensor, and meets the requirements of small portable acoustic detection tasks.

[0018] (2) The pappus ejection module of the present invention is composed of a power module, a timing module and a release module. The timing module receives various instructions, sets the time for airdrop according to the received instructions and automatically counts down. When the countdown reaches the set time, it sends an airdrop execution command to the release module to control the opening of the pappus. This solves the problem that the landing point of airdrops by drones or manned aircraft is difficult to accurately control and still requires manual deployment, thereby reducing the consumption of manpower and material resources and reducing the danger to personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an overall structural diagram of the dandelion-like structure slow-falling sound detection device of the embodiment when the pappus is stored;

[0020] Figure 2 This is an overall structural diagram of the dandelion-like structure of the slow-falling sound detection device in the embodiment, in which the pappus is unfolded into an umbrella shape during the airdrop process;

[0021] Figure 3 is a structural diagram of a pappus storage module in a dandelion-like structured slow-falling sound detection device according to an embodiment;

[0022] Figure 4 is a structural diagram of a pappus ejection module in a dandelion-like structured slow-falling sound detection device according to an embodiment;

[0023] Figure 5 is a structural diagram of a tail buffer device in a dandelion-like structured slow-falling sound detection device according to an embodiment;

[0024] Reference numerals:

[0025] 1. Pappus storage module; 2. Pappus ejection module; 3. Sound detector; 4. Tail buffer device; 5. Magnetic charging port; 6. Pappus; 7. Limiting structure; 8. Pappus spacer Pappus spacer; 9. Central axis; 10. Hollow cylindrical bottom wall; 11. Rotating shaft; 12. Release module; 13. Timing module; 14. Power module; 15. Air inlet / liquid hole; 16. Sealing cover; 17. Airbag; 18. Buffer. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] like Figure 1 As shown, the present embodiment provides a dandelion-like structured slow-falling sound detection device, comprising a pappus storage module 1, a pappus pop-up module 2, and a sound detector 3. The pappus storage module 1 is connected to one end of the pappus pop-up module 2, and the sound detector 3 is connected to the other end of the pappus pop-up module 2.

[0028] like Figure 4 As shown, the pappus ejection module 2 includes a release module 12, a timing module 13, a first power module 14 and a first metal shell, and the timing module 13 and the first power module 14 are arranged in the first metal shell. The first power module 14 uses a small battery as a power module to power the timing module 13. The timing module 13 includes a first communication module and a signal processor. The first communication module is used to transmit various instructions issued by an external device to the signal processor; the first communication module is composed of a Bluetooth module and a level conversion module, and the Bluetooth module transmits various instructions issued by the external device to the signal processor through a level conversion model. The signal processor sets the time for airdrop according to the received instructions and automatically counts down. When the countdown reaches the set time, the airdrop execution command is sent to drive the release module to control the pappus to unfold and form an umbrella shape. The release module 12 includes a hollow cylinder and a ring, one end of the hollow cylinder has a bottom wall, and the end is fixedly connected to the end of the first shell away from the sound detector. One end of the ring is embedded in the other end of the hollow cylinder and can move up and down along the inner wall of the hollow cylinder.

[0029] In order to ensure the normal use of the first power supply 14, the present embodiment is provided with a magnetic charging contact on the first metal shell corresponding to the position of the first power supply 14. The setting of the magnetic charging contact makes it possible to charge the module without disassembling the internal components. The Bluetooth module uses a BLE module based on the CC2540 chip. The Bluetooth chip can communicate with Bluetooth devices such as mobile phones, and has the advantages of fast transmission rate and the ability to check the remaining power in the battery. Therefore, in practical applications, this feature is used to modify the airdrop time in external devices such as mobile phones according to needs, so that the slow-descent system can be applied to a variety of airdrop heights and airdrop environments. The signal processor is composed of a single-chip microcomputer, a digital signal processor (DSP), a programmable logic gate array (FPGA) or an embedded system (ARM), and includes memory and basic peripheral circuits. In this embodiment, a single-chip microcomputer is preferably used as a signal processor, and small chips such as AT89C51 are used to achieve low-cost high-precision timing.

[0030] like Figure 3 As shown, the pappus storage module is arranged at one end of the pappus ejection module 2, including a central shaft 9, one end of the central shaft 9 is connected to the bottom wall of the circular inner tube, and the other end is provided with a rotating shaft 11, and a plurality of pappus 6 are arranged circumferentially on the rotating shaft 11, and a pappus spacer 8 is arranged between two adjacent pappus, and the pappus spacer 8 is the same length as the pappus 6 or slightly shorter than the pappus 6 to prevent the pappus 6 from overlapping. Each pappus 6 includes a free end and a fixed end connected to the rotating shaft 11, and a limiting structure 7 for suppressing the deflection of the pappus 6 is provided at the end of the rotating shaft 11 away from the central shaft 9. Figure 1 As shown, in the initial state, the pappus 6 is in a retracted state, and the pappus spacer 8 allows each pappus 6 to be neatly arranged axially, and the free end of each pappus 6 is bound by the outer circle of the release module 12. Figure 2 As shown, when the airdrop command is executed, under the action of gravity, the ring moves downward and the pappus 6 pops out; in this process, thanks to the action of the pappus spacer 8, the pappus 6 can be smoothly deployed, effectively avoiding the occurrence of entanglement or jamming, thereby significantly improving the reliability and stability of the deployment of the pappus 6 and ensuring the smooth descent of the detector when falling.

[0031] In this embodiment, in order to ensure that the pappus 6 can be ejected smoothly during the airdrop, a gap of 2 to 3 mm is left between the free end of the pappus 6 and the bottom wall of the cylinder, and a gap of 2 to 3 mm is left between the pappus 6 and the central shaft 9. During the airdrop of the device of this embodiment, the airflow will enter these pores and automatically lift the pappus 6 to make it unfold in an umbrella shape, without the need for other devices to apply external force to the pappus. In this way, not only the weight of the module is reduced, but also the center of gravity of the device as a whole is lowered, and the stability during the airdrop process is enhanced.

[0032] The acoustic detector is a load, which is arranged at the other end of the pappus pop-up module, and is used to capture and process acoustic signals in the environment and transmit them to the remote terminal. The acoustic detector includes a microphone, a signal processing circuit, a storage module, a second communication module, a second power module and a second metal shell. The microphone, the signal processing circuit, the storage module, the second communication module and the second power module are arranged in the second metal shell; wherein the microphone is used to capture acoustic signals in the environment and transmit them to the signal processing circuit, the signal processing circuit is used to amplify, filter and digitize the captured acoustic signals to obtain acoustic data, and transmit them to the storage module and the second communication module respectively, the storage module is used to store acoustic data, the communication module is used to transmit acoustic data to the remote terminal, and the second power module is used to power the various components of the acoustic detector.

[0033] In this embodiment, the microphone is a MEMS microphone, which has the characteristics of high sensitivity, low noise and high-performance wide-band response, and can ensure that the microphone can work normally under various environmental conditions. The processing circuit is composed of an amplifier, a filter and an analog-to-digital converter connected in sequence. The storage module adopts a large-capacity MicroSD flash memory, and the second communication module adopts a low-power LoRa or NB-IoT wireless communication technology to achieve long-distance, low-power data transmission. The second communication module also supports a variety of communication protocols, such as Bluetooth, Wi-Fi, etc., to adapt to different application scenarios. The second power supply module provides power support for each component of the sound detector, and adopts a small lithium battery to ensure the power supply of the device during the airdrop process and during operation. In order to achieve low power management and charging protection and extend the service life of the device, it is also necessary to configure the power management circuit in the power supply module according to the needs during use. In addition, in order to improve data conversion and processing efficiency, this embodiment also adds a microprocessor to the sound detector, and the microprocessor selects the STM32 series microcontroller, which is respectively connected to the microphone, the analog-to-digital converter and the second communication module.

[0034] In view of the above device, this embodiment further provides a tail buffer device 4, such as Figure 5 As shown, the tail buffer device 4 is a second measure to reduce the impact force when the device lands, and is also a remedial measure after the pappus release module fails. It is composed of an airbag 17 and a sealing cover 16 for sealing the airbag 17. The airbag 17 is filled with a buffer 18 or air, and the sealing cover 16 is provided with an air inlet hole, and the buffer 18 or air flows in from the air / liquid inlet hole 15; the sealing cover 16 is detachably connected to the acoustic detection device 3. In this embodiment, the sealing cover 16 and the acoustic detection device 3 are detachably connected through threads.

[0035] In this embodiment, the sealing cover 16 is made of a hard and lightweight material, specifically polycarbonate or ABS plastic. The airbag 17 is made of silicone rubber. Since silicone rubber has the characteristics of high elasticity, aging resistance, high and low temperature resistance, relatively regular molecular structure, and close network structure formed by cross-linking, this characteristic enables it to form an effective barrier to liquids. When silicone oil is filled as a buffer 18, the airbag 17 made of silicone rubber can prevent the buffer 18 wrapped therein from leaking; during the landing process, the airbag 17 is impacted, which will drive the buffer in the airbag 17 to flow. When flowing, the buffer can absorb and disperse energy, effectively reducing the impact on the slow-down sound detector. The properties of silicone oil are similar to those of silicone rubber, and its freezing point is very low, so it can maintain good fluidity even under harsh weather conditions. The buffer device 4 after the silicone oil is injected can also lower the overall center of gravity, so that the device is always vertically downward during the airdrop process, and improve the accuracy of the landing point. Even if only enough air is injected into the airbag 17 to open it, and no buffer is injected, the high elasticity of the airbag itself can also play a certain buffering role after landing.

[0036] The use process of the above-mentioned dandelion-like structure slow-falling sound detection device is as follows:

[0037] Step 1: Perform a comprehensive inspection on each module to ensure that it can work normally and keep the pappus in a folded state.

[0038] Step 2: After the inspection is completed, the slow-descent sound detection device is installed into the airdrop module of the drone.

[0039] Step 3: When the drone reaches the designated airspace, the external device sends instructions to the timing module. The timing module sets the time for airdrop according to the instructions received and automatically counts down.

[0040] Step 4. When the countdown reaches the set time, the timing module sends the airdrop command to the release module to drive the crown hair to pop out and automatically unfold into an umbrella-like structure under the action of airflow, which greatly reduces the falling speed of the device and reduces the impact force when landing. After landing, the airbag and buffer in the tail buffer device will further absorb kinetic energy.

[0041] In summary, the slow-descent sound detection device of this embodiment provides an ideal product solution for the airdrop of sound detectors, and overcomes the technical problem that sound detectors are easily damaged during the airdrop and landing process. Compared with the traditional parachute solution, the parachute body with a dandelion-like structure can achieve precise airdrops and is not affected by adverse weather conditions and the natural environment of the landing point; compared with the airbag-wrapped sound detector solution, the cylindrical shape of the device occupies less space, and the number of single airdrops is greater, while also providing more effective protection for the sound detector; compared with the rotor solution, the dandelion-like structure is smaller in size, lighter in weight, and lower in cost, and the required materials are simpler, and the design is simpler, making it suitable for large-scale mass production. This design not only improves the reliability and safety of airdrops, but also significantly reduces manufacturing and use costs.

[0042] The above description is only a specific implementation mode of the present invention. Any feature disclosed in this specification, unless otherwise stated, can be replaced by other alternative features that are equivalent or have similar purposes; all disclosed features, or all steps in the method process, except for mutually exclusive features and / or steps, can be combined in any way.

Claims

1. A dandelion-like structure slow-falling sound detection device, a pappus storage module, a harmonic sound detector, and a pappus ejection module, characterized in that: The pappus storage module is arranged at one end of the pappus ejection module, including a central shaft, a rotating shaft is arranged at one end of the central shaft, a plurality of pappus are arranged on the rotating shaft along the circumference to form a pappus group, and the pappus group has two states of folding and unfolding, each pappus includes a free end and a fixed end connected to the rotating shaft, and a limiting structure for suppressing the deflection of the pappus is arranged at one end of the rotating shaft away from the central shaft; The acoustic detector is arranged as a load at the other end of the pappus ejection module, and a second shell is provided on the outer surface of the acoustic detector, which is used to capture and process acoustic signals in the environment and transmit them to the remote terminal; The pappus pop-up module includes a timing module, a release module, a first power module and a first shell; the timing module and the first power module are arranged in the first shell, the timing module includes a first communication module and a signal processor, the first communication module is used to transmit various instructions issued by the external device to the signal processor; the signal processor sets the time for airdrop according to the received instructions and automatically counts down, and when the countdown reaches the set time, sends the execution airdrop command to the release module; the release module is used to constrain the pappus to retract in the initial state, and drives the release module to pop out the pappus according to the received airdrop command; the first power module is used to power the processor and the first communication module.

2. The falling sound detection device according to claim 1, characterized in that: The dandelion-like structure slow-descent sound detection device also includes a tail buffer device, which includes an airbag and a sealing cover for sealing the airbag. The airbag is filled with buffer solution or air, and the sealing cover is provided with an air inlet hole, and the buffer solution or air flows in from the air inlet; the sealing cover is detachably connected to the sound detection device.

3. The falling sound detection device according to claim 2, characterized in that: The sealing cover is made of hard and light material, the airbag material is silicone rubber, and the buffer is made of silicone oil.

4. The falling sound detection device according to claim 1, characterized in that: The release module includes a hollow cylinder and a ring. One end of the hollow cylinder has a bottom wall, which is fixedly connected to the end of the second shell away from the sound detector. One end of the ring is embedded in the other end of the cylinder and can move up and down along the inner wall of the hollow cylinder.

5. The falling sound detection device according to claim 1, characterized in that: A pappus spacer is provided between two adjacent pappus. The pappus spacer is consistent with the length of the pappus to prevent overlapping between the pappus and ensure that they are neatly arranged in the storage module, so that the pappus can be smoothly unfolded after being popped out, avoiding entanglement or jamming, thereby effectively improving the reliability and stability of the pappus deployment and ensuring that the detector can descend smoothly when falling.

6. The falling sound detection device according to claim 1, characterized in that: The acoustic detector includes a microphone, a signal processing circuit, a storage module, a second communication module and a second power module; the microphone is used to capture acoustic signals in the environment and transmit them to the signal processing circuit, the signal processing circuit is used to amplify, filter and digitize the captured acoustic signals to obtain acoustic data and transmit them to the storage module and the second communication module respectively, the storage module is used to store acoustic data, the communication module is used to transmit the acoustic data to a remote terminal, and the second power module is used to power the various components of the acoustic detector.

7. The falling sound detection device according to any one of claims 1 to 6, characterized in that: The first shell is provided with a magnetic charging contact at a position corresponding to the first power source.

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