An underwater explosion shock wave testing device

Abstract

The application provides an underwater explosion shock wave testing device, which comprises a sealed shell and two-way pressure sensors, two-way signal conditioning circuits integrated on a circuit board, a data acquisition and storage module, a communication module and a power module sealed in the shell, wherein: the two-way pressure sensors realize sensing of underwater explosion shock waves and convert the underwater explosion shock waves into electrical signals input to the signal conditioning circuits; the two-way signal conditioning circuits realize adjustment of the sensor output signals and conversion into differential signals; the data acquisition and storage module samples the conditioned shock wave signals, converts the shock wave signals into digital signals and stores the digital signals in real time; the communication module realizes communication and data transmission between the testing device and an upper computer, and the upper computer filters, extracts and analyzes and processes underwater explosion shock wave data; and the power module supplies power for operation of the testing device. The application can more accurately complete measurement and save data, calculate and analyze underwater explosion power, and has a good application prospect.

Description

Technical Field

[0001] This invention relates to underwater explosion measurement, specifically to an underwater explosion shock wave testing device and an underwater explosion shock wave testing method. Background Technology

[0002] The explosive power of underwater weapons is mainly reflected in the magnitude of the blast shock wave and bubble pulsation. The structural damage and impact response of ships under underwater explosions are also caused by the blast shock wave. Underwater blast shock wave pressure testing is not only of great significance for the design of explosive charges and the improvement of warhead power, but also serves as an important basis for the assessment of passive impact damage to ships and the study of fundamental issues such as underwater blasting engineering and destructive effects.

[0003] Existing technologies for testing underwater explosion shock waves can be categorized into three methods: wire-based electrical testing, wireless transmission testing, and real-time storage. Wire-based electrical testing connects a sensor at a testing point to a remote data acquisition system via a cable. Its advantage is real-time monitoring of the sensor's operating status, but its disadvantages include complex on-site setup and significant signal interference. Wireless transmission testing typically uses a cable connecting a surface buoy to an underwater pod, placing a wireless communication module on the buoy to achieve communication and data transmission with the remote control system. Its advantages include simple on-site setup and real-time monitoring of the test unit's operating status, but its disadvantages include slow data acquisition speed and unstable transmission due to communication limitations. Furthermore, both of these methods carry the risk of data loss due to cable breakage during practical operation. Summary of the Invention

[0004] The purpose of this invention is to provide a testing device for underwater explosion shock waves to ensure the effectiveness, precision and authenticity of underwater shock wave testing.

[0005] The technical solution for achieving the objective of this invention is as follows: an underwater explosion shock wave testing device, comprising a sealed housing and two pressure sensors sealed within the housing, two signal conditioning circuits integrated on a circuit board, a data acquisition and storage module, a communication module, and a power supply module, wherein:

[0006] Two pressure sensors detect the underwater explosion shock wave and convert it into an electrical signal, which is then input to the signal conditioning circuit. The two signal conditioning circuits adjust the sensor output signals and convert them into differential signals. The data acquisition and storage module samples the conditioned shock wave signal, converts it into a digital signal, and stores it in real time. The communication module enables communication and data transmission between the test device and the host computer, which filters, extracts, and analyzes the underwater explosion shock wave data. The power supply module provides power to the test device.

[0007] Furthermore, the sealed housing structure includes sensor base A, M2 screws, front cover, cylindrical housing, battery compartment, rear cover, and sensor base B, wherein:

[0008] The sensor base A consists of two parts: a front base and a rear base. The front base has a round hole with an inner diameter of 12mm and a threaded inner wall for installing a pressure sensor. The rear base is used to connect with the cylindrical shell. The two base parts are connected and fixed by four M2 screws.

[0009] Sensor base B has a circular hole with an inner diameter of 10mm and a depth of 30mm for installing another sensor. Sensor base B is connected and fixed to the cylindrical shell by two M2 screws.

[0010] The cylindrical outer shell has two 7mm diameter through holes at the front and back for the sensor connection wire to pass through;

[0011] The battery slot opening faces the rear end of the cylinder and is used to install the device battery. It is connected to the cylinder shell by three M2 screws.

[0012] The front and rear covers are connected to the cylindrical outer shell by threads.

[0013] Furthermore, the pressure sensors used are the 6213B type pressure sensor and the 138A51 type pressure sensor. The 6213B type pressure sensor has a measurement range of 0-8000 bar and a sensitivity of -1.2 pC / bar, and is installed in the sensor base A. The 138A51 type pressure sensor is an ICP type explosion pressure sensor with a built-in charge amplifier, a measurement range of 0-3450 bar, and a sensitivity of 1.5 mV / bar, and is installed in the sensor base B.

[0014] Furthermore, the cylindrical outer shell is made of 35CrMnSiA material, and the shell thickness is set to 5mm.

[0015] Furthermore, different sensors have different signal conditioning circuits. The signal conditioning circuit of the 6213B pressure sensor includes a charge amplifier and a differential circuit, while the signal conditioning circuit of the 138A51 pressure sensor includes an attenuation circuit and a differential circuit. The charge amplifier converts the charge signal and voltage signal output by the 6213B pressure sensor, the attenuation circuit reduces the amplitude of the voltage signal output by the 138A51 pressure sensor, and the differential circuit converts the single signal into a differential signal for input to the ADC chip.

[0016] Furthermore, the acquisition and storage module includes two high-speed acquisition circuits. The acquisition section uses an SNR-type ADC chip with a sampling bit depth of 16 bits and a conversion speed of 10MHz. The storage section uses two high-speed cache chips (SRAM) to implement ping-pong buffering, and four non-volatile memory chips (NAND-FLASH) to form a two-level 16-bit pipelined memory to complete the real-time storage of the acquired data. The two SRAM chips and four NAND-FLASH chips are all connected to the STM32's FSMC interface. The selection of the memory chips and the real-time storage of data are realized through the chip select port and time-division multiplexing.

[0017] Furthermore, the power module includes a 7.4V lithium battery, a voltage divider circuit, a boost circuit, and a charging circuit. The voltage divider circuit is connected to the 7.4V lithium battery and, by dividing the power supply voltage, provides power to the two signal conditioning circuits, the data acquisition and storage module, and the communication module. The boost circuit is connected to one output of the voltage divider circuit to provide power to the 138A51 pressure sensor. The charging circuit is connected to the 7.4V lithium battery to charge the 7.4V lithium battery.

[0018] Furthermore, the communication circuit includes two parts: 100Mbps Ethernet and serial communication. The 100Mbps Ethernet interface is RJ45, and the serial communication interface is Micro-USB. Both are used for data transmission between the underwater explosion shock wave testing device and the host computer.

[0019] Furthermore, the assembly method is as follows: The battery slot is installed inside the cylindrical shell using three M2 screws; the circuit board is connected to the battery via a connector on the outside of the device, and the circuit board is connected to the two KIAG 10-32 coaxial cables of the 6213B pressure sensor and the 138A51 pressure sensor; after connection, the circuit board is inserted horizontally into the slot inside the cylindrical shell 4, and the battery is installed in the battery slot; the rear base of sensor base A is installed at the front through hole of the cylinder using M2 screws, and the KIAG 10-32 coaxial cable located above the circuit board is passed through the front through hole of the cylindrical shell and the rear base of sensor base A to connect to the 6213B pressure sensor; the 6213B pressure sensor is connected to the front base of sensor base A via threads, and the front base and rear base with the 6213B pressure sensor installed are connected using four M2 screws; sensor base B is installed at the rear through hole of the cylindrical shell using M2 screws, and the KIAG 10-32 coaxial cable located below the circuit board is connected to the rear base. A 10-32 coaxial cable is passed through the rear through-hole of the cylindrical shell and the sensor base B to connect to the 138A51 pressure sensor. The connected 138A51 is inserted into the sensor base B, and non-conductive liquid silicone oil is filled at the connection point. Waterproof tape is then wrapped around the connection point. The front cover is installed and threaded to the cylindrical shell. After completing the above installation steps, the device is placed upright with the front cover facing down, and epoxy resin is poured into the cylinder up to the top of the circuit board. The rear cover is then installed and threaded to the cylindrical shell. This completes the assembly of the entire device.

[0020] Furthermore, the host computer first uses a filtering algorithm to remove noise from the collected underwater explosion shock wave, then extracts the peak value of the shock wave through a polynomial fitting method, and uses a small packet decomposition algorithm to extract the energy characteristics of the shock wave, thus completing the extraction of shock wave data and the calculation of the explosive power. Finally, the pressure change of the underwater explosion field is obtained from the data of multiple measuring points.

[0021] Compared with the prior art, the significant advantages of this invention are: 1) It designs a high-strength, sealed, and waterproof protective cylinder suitable for underwater use, and installs two pressure sensors with different ranges on the front and rear sides to achieve two-point testing of one device; 2) It adopts a 10MHz high-speed acquisition circuit, which makes the analog-to-digital conversion more precise and uses non-volatile memory to store the data inside the device, effectively preventing data loss caused by damage to the device underwater. Attached Figure Description

[0022] Figure 1 This is a cross-section of the test device structure and a schematic diagram of its installation.

[0023] Figure 2 This is a side view of the testing device of the present invention.

[0024] Figure 3This is a block diagram of the circuit structure of the test device of the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments.

[0026] like Figure 1 As shown, an underwater explosion shock wave testing device includes a high-strength, impact-resistant sealed shell. The shell comprises a sensor base A1, an M2 screw 2, a front cover 3, a cylindrical shell 4, a battery compartment 5, a rear cover 6, a sensor base B7, two pressure sensors, a dual-channel signal conditioning circuit, a data acquisition and storage module, a communication module, a power supply module, a host computer, and a data processing method. The sensor base A1, M2 screw 2, front cover 3, cylindrical shell 4, battery compartment 5, rear cover 6, and sensor base B7 are mechanical components and require lathe machining. The pressure sensors, dual-channel signal conditioning circuit, data acquisition and storage module, communication module, and power supply module are electronic devices, requiring component selection and circuit design. The host computer and data processing method constitute the software component and require program writing. The functions of each module are described in detail below.

[0027] The high-strength, impact-resistant sealing shell uses a high-density, high-strength low-alloy ultra-high-strength steel, 35CrMnSiA. This material has very high strength and toughness, with a yield strength greater than or equal to 1275 MPa and a tensile strength greater than or equal to 1620 MPa. To withstand the ultra-high pressure generated during an underwater explosion, the shell is designed in a cylindrical shape with a thickness of 5 mm.

[0028] The device is assembled as follows: Battery slot 5 is installed inside cylindrical shell 4 using three M2 screws; the circuit board is connected to the battery externally via a mounting bracket, and the circuit board is connected to two KIAG10-32 coaxial cables for the 6213B pressure sensor and the 138A51 pressure sensor; the circuit board is inserted horizontally into the slot inside cylindrical shell 4, and the battery is installed in battery slot 5; the rear base of sensor base A1 is installed at the front through-hole of the cylinder using M2 screws, and the KIAG 10-32 coaxial cable located above the circuit board is passed through the front through-hole of the cylindrical shell 4 and the rear base of sensor base A1 to connect to the 6213B pressure sensor; the 6213B pressure sensor is connected to the front base of sensor base A1 via threads, and the front base and rear base with the 6213B pressure sensor installed are connected using four M2 screws; sensor base B2 is installed at the rear through-hole of the cylindrical shell 4 using M2 screws, and the KIAG 10-32 coaxial cable located below the circuit board is connected to the rear base. A 10-32 coaxial cable is passed through the rear through-hole of the cylindrical shell 4 and the sensor base B7 to connect to the 138A51 pressure sensor. The connected 138A51 is inserted into the sensor base B7, and non-conductive liquid silicone oil is filled at the connection point. Waterproof tape is then wrapped around the connection point. The front cover 2 is installed and connected to the cylindrical shell 4 by threads. The device is placed upright with the front cover facing down, and epoxy resin is poured into the cylinder. The rear cover 6 is installed and connected to the cylindrical shell 4 by threads. This completes the assembly of the entire device.

[0029] The pressure sensors described are a 6213B piezoelectric pressure sensor and a 138A51 pressure sensor. The 6213B sensor has a measurement range of 0-8000 bar, a sensitivity of -1.2 pC / bar, high stability, no pyroelectric drift, and excellent linearity. The 138A51 pressure sensor is an ICP-type explosion pressure sensor with a built-in charge amplifier, a measurement range of 0-3450 bar, and a sensitivity of 1.5 mV / bar.

[0030] The two-channel signal conditioning circuit processes the output signals from the two sensors separately and inputs them to the ADC port, including signal amplification and differential signal output. The 6213B pressure sensor is a charge output sensor with a full-scale charge output of -8000pC. Therefore, a charge amplifier is needed to convert the charge into a voltage value. An operational amplifier with high input impedance and low input bias current is used to construct the charge amplifier, with a gain of -2.5. The 138A51 pressure sensor has a built-in charge amplifier, a measurement range of 0-3450 bar, a sensitivity of 1.5mV / bar, and a voltage output of 0-5V. A voltage attenuation circuit needs to be designed to adjust the voltage to 0-2.5V, with an attenuation factor of 0.5. A differential circuit is designed to convert the signal into a differential signal with a peak-to-peak value of 2.5V for input to the ADC chip.

[0031] The data acquisition and storage circuit described above is used for analog-to-digital conversion and synchronous storage of the shock wave signal output from the signal conditioning circuit. The acquisition circuit uses two LTC2202 ADC chips with a conversion speed of 10MSPS, a conversion bit depth of 16 bits, and parallel port output to form two high-speed acquisition circuits. The input clock of the ADC chips is provided by the main control CPU. The output signal of the LTC2202 first enters a latch and then is synchronously input to the I / O port of the main control CPU. The data conversion speed of the two high-speed acquisition circuits is much higher than the write speed of any non-volatile memory chip. Therefore, two static random access memories (SRAM) are used to buffer the data using a ping-pong buffering method, and four NAND-FLASH chips are used to form a 16-bit two-stage pipelined memory to complete the data storage. The two SRAM chips and four NAND-FLASH chips are all connected to the STM32's FSMC interface, and the selection of memory chips and real-time data storage are achieved through chip select ports and time-division multiplexing.

[0032] The power module includes a lithium battery, a voltage divider circuit, and a charging circuit. Since the device operates independently underwater, it requires a battery power supply; two 3.7V polymer lithium batteries connected in series provide 7.4V to the circuit board. The voltage divider circuit divides the 7.4V power supply to power two signal conditioning circuits, a data acquisition and storage module, and a communication module. The signal conditioning circuits require ±5V and 3.3V operating voltages, while the data acquisition and storage module and communication module operate at 3.3V. The boost circuit amplifies the +5V output from the voltage divider circuit to provide the 28V power supply required by the constant current source, which outputs 4mA to power the 138A51 sensor. The charging circuit manages the charging of the lithium battery; the charging voltage is provided by the USB interface.

[0033] The communication circuit includes two transmission methods: 100Mbps Ethernet and serial communication. The 100Mbps Ethernet interface is RJ45, and the serial communication interface is Micro-USB. Both can be used for data transmission between the testing device and the host computer.

[0034] The data processing module located on the host computer first filters the acquired underwater explosion shock wave signal, then uses a polynomial fitting method to extract the peak value of the shock wave, and employs a small packet decomposition algorithm to extract the energy characteristics of the shock wave, thus completing the extraction of shock wave data and the calculation of the explosive force. The pressure changes in the underwater explosion field can be simulated using data from multiple measuring points.

[0035] In summary, the testing method of this invention belongs to the real-time storage method. By installing two pressure sensors in the same device, the experimental equipment is further reduced, and there is no risk of data loss due to cable breakage.

[0036] Example

[0037] Step 1: Synchronize the clocks of each measuring point device in the test system, configure the position information of each device, erase the data on the memory chip, and place it in the water at the designated location;

[0038] Step 2: After the device is submerged in water, it enters a low-power standby state to wait for the shock wave signal.

[0039] Step 3: Once the sensor detects the shock wave, the system enters the working state, and the acquisition and storage module realizes high-speed acquisition and storage of sensor signals;

[0040] Step 4: After the experiment, retrieve the device and transmit the data from the testing device to the host computer via 100Mbps Ethernet or serial communication.

[0041] Step 5: Extract valid shock wave data through the data processing module in the host computer, obtain the shock wave change curves at each measuring point, and analyze and calculate the explosive power.

[0042] Although the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Based on the technical solutions of the present invention, those skilled in the art can make various modifications or variations without creative effort, which are still within the scope of protection of the present invention.

Claims

1. An underwater explosion shock wave testing device, characterized in that, It includes a sealed housing and two pressure sensors sealed inside the housing, two signal conditioning circuits integrated on a single circuit board, a data acquisition and storage module, a communication module, and a power supply module, wherein: Two pressure sensors detect the underwater explosion shock wave and convert it into an electrical signal, which is then input to the signal conditioning circuit. The two signal conditioning circuits adjust the sensor output signals and convert them into differential signals. The data acquisition and storage module samples the conditioned shock wave signal, converts it into a digital signal, and stores it in real time. The communication module enables communication and data transmission between the testing device and the host computer, which filters, extracts, and analyzes the underwater explosion shock wave data. The power supply module provides power to the testing device. The sealed housing structure includes sensor base A (1), M2 screw (2), front cover (3), cylindrical housing (4), battery slot (5), rear cover (6), and sensor base B (7), wherein: The sensor base A (1) consists of two parts: a front base and a rear base. The front base has a round hole with an inner diameter of 12mm and a thread on the inner wall for installing a pressure sensor. The rear base is used to connect with the cylindrical shell (4). The two base parts are connected and fixed by four M2 screws (2). The sensor base B (7) is provided with a round hole with an inner diameter of 10 mm and a depth of 30 mm, which is used to install another sensor. The sensor base B (7) and the cylindrical shell (4) are connected and fixed by two M2 screws. The cylindrical outer shell (4) has two through holes with a diameter of 7mm at the front and back for the sensor connection wire to pass through; The battery slot (5) opens towards the rear end of the cylinder and is used to install the device battery. It is connected to the cylinder shell (4) by 3 M2 screws. The front cover (3) and the rear cover (6) are connected to the cylindrical outer shell (4) by threads; The pressure sensors used are the 6213B type pressure sensor and the 138A51 type pressure sensor. The 6213B type pressure sensor has a measurement range of 0-8000 bar and a sensitivity of -1.2 pC / bar, and is installed in the sensor base A (1). The 138A51 type pressure sensor is an ICP type explosion pressure sensor with a built-in charge amplifier, a measurement range of 0-3450 bar, and a sensitivity of 1.5 mV / bar, and is installed in the sensor base B (7). The cylindrical outer shell is made of 35CrMnSiA, and the shell thickness is set to 5mm. Different sensors have different signal conditioning circuits. The signal conditioning circuit of the 6213B pressure sensor includes a charge amplifier and a differential circuit, while the signal conditioning circuit of the 138A51 pressure sensor includes an attenuation circuit and a differential circuit. The charge amplifier converts the charge signal and voltage signal output by the 6213B pressure sensor, the attenuation circuit reduces the amplitude of the voltage signal output by the 138A51 pressure sensor, and the differential circuit converts the single signal into a differential signal and inputs it to the ADC chip. The acquisition and storage module includes two high-speed acquisition circuits. The acquisition section uses an SNR-type ADC chip with a sampling bit depth of 16 bits and a conversion speed of 10MHz. The storage section uses two high-speed cache chips (SRAM) to implement ping-pong buffering, and four non-volatile NAND-FLASH chips to form a two-level 16-bit pipelined memory to complete the real-time storage of the acquired data. The two SRAM chips and four NAND-FLASH chips are all connected to the STM32's FSMC interface. The selection of the storage chips and the real-time storage of data are realized through the chip select port and time-division multiplexing.

2. The underwater explosion shock wave testing device according to claim 1, characterized in that, The power module includes a 7.4V lithium battery, a voltage divider circuit, a boost circuit, and a charging circuit. The voltage divider circuit is connected to the 7.4V lithium battery and provides power to the two signal conditioning circuits, the data acquisition and storage module, and the communication module by dividing the power supply voltage. The boost circuit is connected to one output of the voltage divider circuit to provide power to the 138A51 pressure sensor. The charging circuit is connected to the 7.4V lithium battery to charge the 7.4V lithium battery.

3. The underwater explosion shock wave testing device according to claim 1, characterized in that, The communication circuit consists of two parts: 100Mbps Ethernet and serial communication. The interface type of 100Mbps Ethernet is RJ45, and the interface type of serial communication is Micro-USB. Both are used for data transmission between the underwater explosion shock wave testing device and the host computer.

4. The underwater explosion shock wave testing device according to claim 1, characterized in that, The assembly method is as follows: The battery slot (5) is installed inside the cylindrical shell (4) with 3 M2 screws; the circuit board is connected to the battery through a bracket outside the device, and the circuit board is connected to the two KIAG 10-32 coaxial cables of the 6213B pressure sensor and the 138A51 pressure sensor; after the connection is completed, the circuit board is inserted horizontally into the slot inside the cylindrical shell (4), and the battery is installed in the battery slot (5); the rear base of the sensor base A (1) is installed at the front end through hole of the cylinder with M2 screws, and the KIAG 10-32 coaxial cable located above the circuit board is passed through the front end through hole of the cylindrical shell (4) and the rear base of the sensor base A (1) is connected to the 6213B pressure sensor, the 6213B pressure sensor is connected to the front base of the sensor base A (1) by threads, and the front base and the rear base with the 6213B pressure sensor are connected by four M2 screws; the sensor base B (7) is installed at the rear end through hole of the cylindrical shell (4) with M2 screws, and the KIAG 10-32 coaxial cable located below the circuit board is connected to the rear base. The 10-32 coaxial cable passes through the rear end through hole of the cylindrical shell (4) and the sensor base B (7) to connect with the 138A51 pressure sensor. The connected 138A51 is inserted into the sensor base B (7) and non-conductive liquid silicone oil is filled at the connection. Waterproof tape is used to wrap the connection. The front end cover (3) is installed and connected to the cylindrical shell (4) by threads. After completing the above installation steps, the device structure is placed upright with the front end cover facing down. Epoxy resin is poured into the cylinder until the top of the circuit board is reached. The rear end cover (6) is installed and connected to the cylindrical shell (4) by threads. Thus, the assembly of the entire device is completed.

5. The underwater explosion shock wave testing device according to claim 1, characterized in that, The host computer first uses a filtering algorithm to remove noise from the collected underwater explosion shock wave, then extracts the peak value of the shock wave through a polynomial fitting method, and uses a small packet decomposition algorithm to extract the energy characteristics of the shock wave, thus completing the extraction of shock wave data and the calculation of the explosive power. Finally, the pressure change of the underwater explosion field is obtained from the data of multiple measuring points.

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