A slow descent sound detection device with a dandelion structure

Abstract

The present application relates to a kind of sound detection devices, especially a kind of slow descent sound detection device with dandelion structure, including crown hair storage module, crown hair ejecting module and sound detector;Crown hair storage module is connected with the one end of crown hair ejecting module, and sound detector is connected with the other end of crown hair ejecting module as the load of air drop.This crown hair storage module adopts dandelion design, that is, a plurality of crown hairs made of flexible fiber are arranged in the storage module, which will be unfolded during the falling process to form a buffer structure during air drop.This structure is umbrella-shaped like dandelion crown hair, which increases air resistance by flexible fiber to reduce speed, and can flexibly deform when encountering obstacles, avoiding the disadvantages of rigid structure winding, and can effectively ensure the safety of sound detector landing.The present application is light and compact, does not damage the volume and weight of sensor, and meets the needs of small portable sound detection tasks.

Description

TECHNICAL FIELD

[0001] The present application relates to a sound detection device, in particular to a slow descent sound detection device with a dandelion structure. BACKGROUND

[0002] With the development of science and technology, sound detection technology has been widely used in environmental monitoring, geological exploration and target recognition. As the core component of the sound detection array, the performance of the sound detector directly affects the overall performance of the system. Traditional sound detectors are usually fixed or connected by wires, which has certain limitations in application range. First, the fixed deployment method has poor flexibility because it usually needs to determine the installation position in advance. In the face of sudden situations 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 emerged disaster area, the fixed sound detector is difficult to change position quickly, so it cannot cover the new monitoring area in time. Second, the monitoring range of the fixed deployment method has obvious limitations. The monitoring range is usually constrained by the installation position and direction. In scenarios that require large-scale and multi-point monitoring, such as city noise monitoring, it is difficult for the fixed sound detector to achieve full coverage, and it is likely to miss some important information. After all, it can only monitor the noise level in a specific area, and cannot dynamically adjust the monitoring point to cover the entire city. Finally, fixed deployment also has high safety risks. In some special application scenarios, such as monitoring the activity range of wild animals, fixed devices are easy to be detected and damaged by wild animals.

[0003] In recent years, wireless sound detectors have attracted much attention due to their high flexibility and convenient deployment. At the same time, the unmanned aerial vehicle industry is developing rapidly. Using unmanned aerial vehicles to drop sound detectors can effectively solve the inherent defects caused by fixed installation or wired connection. However, this method of using unmanned aerial vehicles to drop sound detectors also faces a series of problems. When the wireless sound detector is dropped from the unmanned aerial vehicle, it will fall at a relatively fast speed due to the lack of appropriate slow descent means. The impact will not only damage the external packaging structure of the detector and interfere with the normal operation of the sensor, but also may cause damage to the internal precision electronic components of the detector, thereby reducing the detection efficiency of the entire sound array. In addition, hard surfaces such as concrete, cement and gravel will further increase the risk of impact damage. Therefore, it is crucial to develop a sound detector with slow descent function to improve its reliability and service life.

[0004] The existing slow descent technology mainly covers parachutes, airbags and rotors, and its principle is to reduce the falling speed, reduce the impact of falling and control the falling posture. However, these methods have their own shortcomings. For example, although the parachute has a significant effect on reducing the falling speed, it is easy to be entangled in a complex natural environment; the airbag can effectively buffer the impact on the device when landing, but it needs to reserve a larger inflation space and the inflation process is relatively slow, which may cause the device to be damaged because the airbag is not fully inflated when the device has landed. If the airbag is inflated in advance, it will occupy valuable air-drop space, reducing the number of single air-drop. SUMMARY

[0005] Therefore, the present application provides a slow descent sound detection device with a structure similar to that of a dandelion. By utilizing the characteristics of dandelion seeds and their unique crown hair structure, stable air resistance is generated in the air, thereby achieving slow descent and solving the inherent problem of excessive impact on the sound detector array when it is dropped from an unmanned aerial vehicle or manned aircraft, which causes damage to internal components.

[0006] To achieve the above object, the present application adopts the following technical solutions:

[0007] A slow descent sound detection device with a structure similar to that of a dandelion, a crown hair storage module, a sound detector, and a crown hair ejection module;

[0008] The crown hair storage module is arranged at one end of the crown hair ejection module and includes a central shaft. One end of the central shaft is provided with a rotating shaft, and a plurality of crown hairs are arranged on the rotating shaft in a circumferential direction to form a crown hair group. The crown hair group has two states of folding and unfolding. Each crown hair includes a free end and a fixed end connected to the rotating shaft. The end of the rotating shaft away from the central shaft is provided with a limiting structure for suppressing the deflection of the crown hair.

[0009] The sound detector is arranged as a load at the other end of the crown hair ejection module, and a second outer shell is arranged on the outer surface of the sound detector for capturing and processing acoustic signals in the environment and transmitting them to a remote terminal.

[0010] The pinnate pop-up module comprises 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 comprises a first communication module and a signal processor, the first communication module is used for transmitting various instructions issued by an external device to the signal processor; the signal processor sets a time for air drop according to the received various instructions and automatically counts down, and sends an air drop execution command to the release module when the countdown reaches the set time; the release module is used for restraining the pinnate in the initial state, and drives the release module to pop up the pinnate according to the received air drop command; and the first power module is used for powering the processor and the first communication module.

[0011] Further, the air probe device with the dandelion structure further comprises a tail buffer device, the buffer device comprises an air bag and a sealing cover used for sealing the air bag, the air bag is filled with a buffer liquid or air, the sealing cover is provided with an air inlet hole, and the buffer liquid or air flows into the air bag from the air inlet hole; and the sealing cover is detachably connected with the air probe device.

[0012] Further, the sealing cover is made of a hard light material, the air bag is made of silicone rubber, and the buffer liquid is made of silicone oil.

[0013] Further, the release module comprises a hollow cylinder and a ring, one end of the hollow cylinder is provided with a bottom wall, and the end is fixedly connected with one end of the second shell away from the air probe; and 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.

[0014] Further, a pinnate spacing plate is arranged between adjacent two pinnate, the pinnate spacing plate has the same length as the pinnate, so as to prevent the pinnate from overlapping and ensure that the pinnate are arranged in order in the storage module, so that the pinnate can be smoothly unfolded after being popped up, and the occurrence of winding or jamming is avoided, thereby effectively improving the reliability and stability of the pinnate unfolding, and ensuring that the probe can smoothly and slowly descend when falling.

[0015] Further, the air probe comprises a microphone, a signal processing circuit, a storage module, a second communication module and a second power module; the microphone is used for capturing acoustic signals in the environment and transmitting the acoustic signals to the signal processing circuit; the signal processing circuit is used for amplifying, filtering and digitizing the captured acoustic signals to obtain acoustic data, and transmitting the acoustic data to the storage module and the second communication module; the storage module is used for storing the acoustic data; the communication module is used for transmitting the acoustic data to a remote terminal; and the second power module is used for powering the components of the air probe.

[0016] After the above technical scheme is adopted, the present application has the following beneficial effects:

[0017] (1) The present application is designed by imitating dandelion, and a plurality of crowns made of flexible fibers are arranged in the storage module. In the air drop, the crowns will be unfolded in the falling process to form a buffer structure. The structure is umbrella-shaped like dandelion crown, and the air resistance is increased by flexible fibers to reduce the speed. When encountering obstacles, the flexible structure can deform flexibly to avoid the disadvantage of winding of rigid structure, so that the safety of the sound detector is effectively ensured, and the sound detector is light and compact, and the volume and weight of the sensor are not damaged, which meets the needs of small portable sound detection tasks.

[0018] (2) The crown pop-out module of the present application comprises a power module, a timing module and a release module. The timing module receives various instructions, sets the air drop time according to the received instructions, and automatically counts down. When the countdown reaches the set time, the release module is sent to control the crown to open, solving the problem that the landing point of the unmanned aerial vehicle or manned aircraft air drop is difficult to control accurately, and still needs manual deployment, reducing the consumption of manpower and material resources and reducing the danger of personnel. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the overall structure diagram of the slow descent sound detection device with the dandelion structure in the embodiment when the crowns are stored;

[0020] Figure 2 is the overall structure diagram of the slow descent sound detection device with the dandelion structure in the embodiment when the crowns are unfolded as umbrella-shaped in the air drop process;

[0021] Figure 3 is the structure diagram of the crown storage module in the slow descent sound detection device with the dandelion structure in the embodiment;

[0022] Figure 4 is the structure diagram of the crown pop-out module in the slow descent sound detection device with the dandelion structure in the embodiment;

[0023] Figure 5 is the structure diagram of the tail buffer device in the slow descent sound detection device with the dandelion structure in the embodiment;

[0024] REFERENCE NUMERALS:

[0025] 1, crown storage module; 2, crown pop-out module; 3, sound detector; 4, tail buffer device; 5, magnetic charging port; 6, crown; 7, limiting structure; 8, crown spacing plate; 9, center shaft; 10, hollow cylindrical bottom wall; 11, rotating shaft; 12, release module; 13, timing module; 14, power module; 15, air / liquid inlet; 16, sealing cover; 17, air bag; 18, buffer liquid. DETAILED DESCRIPTION

[0026] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0027] As shown in Figure 1 The present embodiment provides a slow descent sound detector with a dandelion structure, which comprises a crown hair storage module 1, a crown hair ejection module 2, and a sound detector 3. The crown hair storage module 1 is connected to one end of the crown hair ejection module 2, and the sound detector 3 is connected to the other end of the crown hair ejection module 2.

[0028] As shown in Figure 4 The crown hair ejection module 2 comprises a release module 12, a timing module 13, a first power module 14, and a first metal shell. The timing module 13 and the first power module 14 are arranged in the first metal shell. The first power module 14 selects a small battery as a power module for supplying power to the timing module 13. The timing module 13 comprises 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. The Bluetooth module transmits various instructions issued by the external device to the signal processor through the level conversion model. The signal processor sets the time of the air drop according to the received instructions and automatically counts down. When the countdown reaches the set time, the execution command of the air drop is sent to drive the release module to control the crown hair to expand and form an umbrella shape. The release module 12 comprises a hollow cylinder and a ring. One end of the hollow cylinder has a bottom wall, and this 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 module 14, a magnetic charging contact is arranged on the first metal shell corresponding to the position of the first power module 14. Through the arrangement of the magnetic charging contact, the charging operation can be performed without disassembling the internal elements of the module. The Bluetooth module selects a BLE module based on 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 of the battery. Therefore, in actual application, according to the demand, the time of the air drop is modified and set in the external device, such as a mobile phone, so that the slow descent system can be applied to various air drop heights and air drop environments. The signal processor is composed of one of a single-chip microcomputer, a digital signal processor (DSP), a programmable logic gate array (FPGA), or an embedded system (ARM), and contains memory and basic peripheral circuits. The single-chip microcomputer is preferably used as the signal processor in the present embodiment, and small chips such as AT89C51 are used to achieve low-cost high-precision timing.

[0030] AsFigure 3 As shown, the pinnate hair storage module is arranged at one end of the pinnate hair ejection module 2, and includes a central shaft 9, one end of which is connected to the bottom wall of the circular inner tube, and the other end is provided with a rotating shaft 11, a plurality of pinnate hairs 6 are arranged on the rotating shaft 11 in the circumferential direction, and a pinnate hair spacing plate 8 is arranged between adjacent two pinnate hairs 6, the length of the pinnate hair spacing plate 8 is consistent with or slightly shorter than that of the pinnate hair 6, so as to prevent overlapping between the pinnate hairs 6. Each pinnate hair 6 includes a free end and a fixed end connected to the rotating shaft 11, and the end of the rotating shaft 11 away from the central shaft 9 is provided with a limiting structure 7 for inhibiting the deflection of the pinnate hair 6. As shown, Figure 1 As shown, in the initial state, the pinnate hair 6 is in a folded state, and the pinnate hair spacing plate 8 can allow each pinnate hair 6 to be arranged in an axial direction in an orderly manner, and the free end of each pinnate hair 6 is bound by the outer circle of the release module 12. As shown, Figure 2 As shown, when the air drop command is executed, under the action of gravity, the circular ring moves downward, and the pinnate hair 6 is ejected at the same time; in this process, thanks to the action of the pinnate hair spacing plate 8, the pinnate hair 6 can be smoothly unfolded, effectively avoiding the occurrence of winding or jamming, thereby significantly improving the reliability and stability of the unfolding of the pinnate hair 6, and ensuring the smooth and slow descent of the probe during falling.

[0031] In this embodiment, in order to ensure that the pinnate hair 6 can be smoothly ejected during the air drop falling process, a gap of 2-3 mm is left between the free end of the pinnate hair 6 and the bottom wall of the cylinder, and a gap of 2-3 mm is left between the pinnate hair 6 and the central shaft 9. During the air drop process of the device in this embodiment, airflow will enter these gaps, automatically lifting the pinnate hair 6 to make it unfold like an umbrella, without the need for other devices to exert external force on the pinnate hair. In this way, not only the self-weight of the module is reduced, but also the center of gravity of the whole device is lowered, thereby enhancing the stability during the air drop process.

[0032] The sound detector is a load arranged at the other end of the pinnate hair ejection module, and is used for capturing and processing acoustic signals in the environment and transmitting them to a remote terminal. The sound 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, signal processing circuit, storage module, second communication module and 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, which is transmitted 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 a remote terminal, and the second power module is used to power the components of the sound detector.

[0033] In this embodiment, the microphone is selected as a MEMS microphone, which has the characteristics of high sensitivity, low noise, high performance and wide frequency response, etc., 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 realize long-distance and low-power data transmission. The second communication module also supports multiple communication protocols such as Bluetooth and Wi-Fi to adapt to different application scenarios. The second power module provides power support for each component of the sound detector, and uses a small lithium battery to ensure power supply during the air drop process and during work. In order to realize low-power management and charging protection and prolong the service life of the device, a power management circuit is configured in the power module according to the requirements during use. In addition, in order to improve the data conversion and processing efficiency, a microprocessor is also added to the sound detector in this embodiment, and the microprocessor selects an STM32 series microcontroller, which is connected to the microphone, the analog-to-digital converter and the second communication module respectively.

[0034] For the above device, this embodiment also provides a tail buffer device 4, as shown in Figure 5 The tail buffer device 4 is a second measure to reduce the impact force when the device falls to the ground, and is also a remedial measure after the coronal hair release module fails, which is composed of an air bag 17 and a sealing cover 16 for sealing the air bag 17. The air bag 17 is filled with a buffer liquid 18 or air, and the sealing cover 16 is provided with an air inlet hole, and the buffer liquid 18 or air flows from the air inlet / hole 15; the sealing cover 16 and the sound detection device 3 are detachably connected, and the sealing cover 16 and the sound detection device 3 are detachably connected through threads.

[0035] The sealing cover 16 is made of hard light material, specifically polycarbonate or ABS plastic. The air bag 17 is made of silicone rubber. Silicone rubber has high elasticity, aging resistance, high and low temperature resistance, and other characteristics, and its molecular structure is relatively regular and the network structure formed by cross-linking is tight. These characteristics enable it to form an effective barrier to liquids. When filled with silicone oil as a buffer 18, the air bag 17 made of silicone rubber can prevent the buffer 18 wrapped therein from leaking. During the landing process, the air bag 17 is impacted, which drives the buffer in the air bag 17 to flow. When flowing, the buffer can absorb and disperse energy, effectively reducing the impact on the sound detector. Silicone oil has similar properties to silicone rubber, and its freezing point is very low, so it can maintain good fluidity in harsh weather conditions. The buffer device 4 filled with silicone oil can also lower the center of gravity, so that the device always points vertically downward during the air drop process, improving the accuracy of the landing point. Even if the air bag 17 is only filled with enough air to expand it, without injecting the buffer, it can also use its high elasticity to provide some buffering effect after landing.

[0036] The use process of the above-mentioned dandelion structure sound detector device is as follows:

[0037] Step 1, check all modules to ensure they are working properly, and make the crown hair treatment fold state.

[0038] Step 2, after checking, put the sound detector device into the air drop module of the unmanned aerial vehicle.

[0039] Step 3, when the unmanned aerial vehicle reaches the designated airspace, send a command to the timing module from the outside, and the timing module sets the air drop time according to the received instructions and automatically counts down,

[0040] Step 4, when the countdown reaches the set time, the single-chip microcomputer in the timing module sends an air drop command to the release module to drive the crown hair to pop out and automatically expand into an umbrella-shaped structure under the action of air flow, greatly reducing the falling speed of the device and thus reducing the impact force when landing. After landing, the air bag and buffer in the tail buffer device will further absorb kinetic energy.

[0041] In conclusion, the slow descent sound detection device of the embodiment provides an ideal product scheme for the air drop of the sound detector, and solves the technical problem that the sound detector is easily damaged in the air drop and landing process. Compared with the traditional parachute scheme, the umbrella body with the structure similar to that of the dandelion can realize precise air drop, and is not affected by the adverse weather conditions and the natural environment of the landing site; compared with the scheme of wrapping the sound detector with the air bag, the cylindrical shape of the device occupies less space, and more sound detectors can be air dropped at a time, and the device can also provide more effective protection for the sound detector; compared with the rotor scheme, the structure similar to that of the dandelion has smaller volume, lighter weight, lower cost, simpler materials, and simpler design, and is suitable for large-scale production. This design not only improves the reliability and safety of the air drop, but also greatly reduces the manufacturing and use cost.

[0042] The above is only a specific embodiment of the present application, and any feature disclosed in the specification can be replaced by other equivalent or similar purpose alternative features unless specifically described. All features disclosed or all steps in the method can be combined in any way except for mutually exclusive features and / or steps.

Claims

1. A slow-falling acoustic detection device with a dandelion-like structure, comprising a crest feather storage module, a sound detector, and a crest feather ejection module, characterized in that: The crest hair storage module is located at one end of the crest hair pop-out module. It includes a central shaft, a rotating shaft at one end of the central shaft, and several crest hairs arranged circumferentially on the rotating shaft to form a crest hair group. The crest hair group has two states: folded and unfolded. Each crest hair includes a free end and a fixed end connected to the rotating shaft. The end of the rotating shaft away from the central shaft is provided with a limiting structure to suppress the bending of the crest hair. The acoustic detector is mounted as a load at the other end of the crown hair ejection module. Its outer surface is covered with a second shell for capturing and processing acoustic signals in the environment and transmitting them to a remote terminal. The crested feather ejection module includes a timing module, a release module, a first power module, and a first housing. The timing module and the first power module are disposed within the first housing. The timing module includes a first communication module and a signal processor. The first communication module is used to transmit various instructions issued by external devices to the signal processor. The signal processor sets the airdrop time 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. In the initial state, the release module is used to constrain the crested feathers to retract. According to the received airdrop command, the release module is driven to eject the crested feathers. The first power module is used to supply power to the processor and the first communication module.

2. The slow-descent acoustic detection device according to claim 1, characterized in that: The slow-descent acoustic detection device with a dandelion-like structure 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 has an air inlet, through which the buffer solution or air flows in. The sealing cover is detachably connected to the acoustic detection device.

3. The slow-descent acoustic detection device according to claim 2, characterized in that: The sealing cap is made of a rigid, lightweight material, the airbag material is silicone rubber, and the buffer solution is made of silicone oil.

4. The slow-descent acoustic 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 housing away from the acoustic 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 slow-descent acoustic detection device according to claim 1, characterized in that: A spacer plate is provided between two adjacent crests. The spacer plate is the same length as the crest to prevent the crests from overlapping and to ensure that they are neatly arranged in the storage module. This allows the crests to unfold smoothly after being ejected, avoiding tangling or jamming. This effectively improves the reliability and stability of the crest unfolding and ensures that the detector can descend smoothly and slowly.

6. The slow-descent acoustic 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 supply module. The microphone is used to capture acoustic signals in the environment and transmit them to the signal processing circuit. The signal processing circuit amplifies, filters, and digitizes the captured acoustic signals to obtain acoustic data, which is then transmitted to the storage module and the second communication module. The storage module stores the acoustic data, the communication module transmits the acoustic data to a remote terminal, and the second power supply module supplies power to the various components of the acoustic detector.

7. The slow-descent acoustic detection device according to any one of claims 1 to 6, characterized in that: The first outer casing is provided with magnetic charging contacts corresponding to the first power supply position.

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