A method for wireless measurement of high-g accelerations during a crash process

Abstract

This invention belongs to the field of impact resistance technology and discloses a wireless measurement method for high g-value acceleration during a collision process. The method includes installing a sensor and supporting circuitry; installing a transmitter and transmitting antenna; overload-resistant potting reinforcement of the measurement module; configuring a wireless receiving device for impact data; and performing acceleration data analysis and processing. This method, by installing a high-overload-resistant wireless transmission measurement device on an experimental model, achieves wireless measurement of acceleration data during the collision process, solving the problem of measuring high g-value acceleration data in high-speed collisions, explosions, and other events. Utilizing wireless transmission, this method eliminates the need for retrieval of measurement and recording equipment, avoiding the problem of difficulty in installing signal transmission lines on high-speed moving objects. It is particularly suitable for situations where high collision velocities generate peak accelerations of tens of thousands of g, and wired data transmission is difficult, thus possessing practical engineering value.

Description

Technical Field

[0001] This invention belongs to the field of impact resistance technology, specifically relating to a wireless measurement method for high g-value acceleration during a collision process. Background Technology

[0002] In events such as explosions, shocks, and high-speed impacts, the resulting high acceleration values, if exceeding the equipment's tolerance limits, can cause equipment failure, damage, or even disintegration. Therefore, measuring the acceleration data that the equipment under test can withstand during such events is of great value for analyzing and evaluating its shock overload resistance performance. Furthermore, measuring the acceleration history data generated during such events also provides important guidance for refining numerical simulation algorithms or experimental models for these events.

[0003] Currently, there are two main methods for measuring parameters such as acceleration in such events: one is the data retrieval method, such as aircraft black boxes; the other is the wired data transmission method, such as the method of connecting sensors and data processing equipment with signal transmission lines in ground tests like explosion impacts. With the first method, at high collision velocities (e.g., hundreds of meters per second or higher), equipment retrieval is difficult, requiring the equipment itself to have good impact acceleration resistance; otherwise, it is difficult to obtain effective measurement data. The second method requires signal transmission lines, including connecting cables, to transmit sensor measurement information. However, in explosion impact environments, the resulting shock waves and debris can easily damage the signal transmission lines, leading to test failure. Furthermore, in collisions involving moving objects, especially high-speed moving objects (such as aircraft and projectiles), it is often difficult to install signal transmission lines on the high-speed moving object to achieve parameter measurement using a wired method.

[0004] Currently, there is an urgent need to develop a wireless measurement method for high g-value acceleration during collision processes. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a wireless measurement method for high g-value acceleration during a collision process, so as to overcome the defects of the prior art.

[0006] The wireless measurement method for high-g acceleration during a collision process according to the present invention includes the following steps: S10. Install the sensor and its supporting circuitry; An accelerometer, along with a signal conditioning module, an acquisition and recording module, and a power supply module, are placed inside the test model. S20. Install the transmitter and transmitting antenna; A transmitter is placed inside the test model. The transmitter includes a wireless transmission module for acquiring acceleration sensor data and a modulation circuit. Several transmitting antennas are installed on the surface of the test model, arranged in a centrally symmetrical manner. S30. Overload-resistant potting reinforcement for the measurement module; After debugging and confirming that each module is functioning normally, the signal conditioning module, acquisition and recording module, power supply module, and transmitter in the test model cavity are bundled together to form the measurement module. The measurement module is placed inside the titanium alloy shell, and epoxy resin is injected into the titanium alloy shell for primary potting. Then, the titanium alloy shell is placed on the central axis of the test model cavity, and polyurethane material is filled into the gaps in the test model cavity for secondary potting. The test model is then sealed, and the test model fabrication is complete. The measurement module's overload resistance is improved through primary and secondary potting to prevent damage from impacts during collisions, achieving overall buffering and stress isolation. The measurement module simultaneously performs sensing, high-speed sampling, buffering, and wireless transmission of high-g acceleration analog signals. S40. Configure a wireless receiving device for impact data; Based on the wireless transmission distance of the test model, a wireless receiving device for impact data is configured outside the collision zone; the wireless receiving device includes a receiving antenna, connecting cables, and data processing equipment. S50. Perform acceleration data analysis and processing; The test model crashes into the target, and the wireless receiving device obtains the impact data. The received impact data simulation signal of the test model is demodulated and decoded, and the voltage curve of the accelerometer is output. The voltage curve is processed by combining the accelerometer calibration data and the gain of the signal conditioning circuit to obtain the acceleration curve of the test model during the impact process.

[0007] Furthermore, the acceleration sensor is an accelerometer with a measurement range of not less than 10,000g; the signal conditioning module includes a signal amplification and filtering circuit, the acquisition and recording module includes an AD sampling circuit, and the power supply module includes a battery; Among them, the accelerometer's range is 50% or more higher than the estimated peak acceleration generated by the collision; the sampling period of the AD sampling circuit is shorter than the duration of the collision process, and the sampling rate is set to the higher value of the AD sampling circuit. The higher the sampling rate, the more collision process history data are obtained.

[0008] Furthermore, the wireless receiving device receives, within a 100-meter radius of the collision point, an analog signal transmitted by the accelerometer with a code rate of not less than 2 Mbps at a sampling rate of not less than 100 kHz and an accuracy of not less than 8 bits; synchronously samples and digitizes the analog signal; and encodes the digitized digital signal in real time and buffers it in a buffer with a capacity of not less than 1 Mbit.

[0009] Furthermore, the digitization process combines the analog signal with the accelerometer's calibrated sensitivity and the gain parameters of the signal conditioning circuit. Using the formula "acceleration = voltage ÷ circuit gain ÷ accelerometer sensitivity", the analog signal is converted into a digital signal to obtain the acceleration value.

[0010] The present invention provides a wireless measurement method for high g-value acceleration during a collision process. By installing a high-overload-resistant wireless transmission measurement device on the test model, it enables wireless measurement of acceleration data during the collision process, solving the problem of measuring high g-value acceleration data in high-speed collisions, explosions, and other events.

[0011] The wireless measurement method for high g-value acceleration during collision processes of the present invention utilizes wireless transmission, eliminating the need for retrieval of measurement and recording equipment and avoiding the problem of signal transmission lines being difficult to install on high-speed moving objects. It is particularly suitable for situations where high collision velocities generate high acceleration peaks of tens of thousands of g, and where wired transmission of measurement data is difficult to achieve, thus possessing practical engineering value. Attached Figure Description

[0012] Figure 1 This is a flowchart of the wireless measurement method for high g-value acceleration during the collision process according to the present invention; Figure 2 This is a schematic diagram of the air cannon firing model structure for an embodiment; Figure 2 In the middle, 1. Accelerometer; 2. Measurement module; 3. Transmitting antenna; Figure 3 The acceleration curve of the air cannon firing model impacting the steel plate in the example is shown. Detailed Implementation

[0013] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0014] like Figure 1 As shown, the wireless measurement method for high g-value acceleration during a collision process according to the present invention includes the following steps: S10. Install the sensor and its supporting circuitry; An accelerometer, along with a signal conditioning module, an acquisition and recording module, and a power supply module, are placed inside the test model. S20. Install the transmitter and transmitting antenna; A transmitter is placed inside the test model. The transmitter includes a wireless transmission module for acquiring acceleration sensor data and a modulation circuit. Several transmitting antennas are installed on the surface of the test model, arranged in a centrally symmetrical manner. S30. Overload-resistant potting reinforcement for the measurement module; After debugging and confirming that each module is functioning normally, the signal conditioning module, acquisition and recording module, power supply module, and transmitter in the test model cavity are bundled together to form the measurement module. The measurement module is placed inside the titanium alloy shell, and epoxy resin is injected into the titanium alloy shell for primary potting. Then, the titanium alloy shell is placed on the central axis of the test model cavity, and polyurethane material is filled into the gaps in the test model cavity for secondary potting. The test model is then sealed, and the test model fabrication is complete. The measurement module's overload resistance is improved through primary and secondary potting to prevent damage from impacts during collisions, achieving overall buffering and stress isolation. The measurement module simultaneously performs sensing, high-speed sampling, buffering, and wireless transmission of high-g acceleration analog signals. S40. Configure a wireless receiving device for impact data; Based on the wireless transmission distance of the test model, a wireless receiving device for impact data is configured outside the collision zone; the wireless receiving device includes a receiving antenna, connecting cables, and data processing equipment. S50. Perform acceleration data analysis and processing; The test model crashes into the target, and the wireless receiving device obtains the impact data. The received impact data simulation signal of the test model is demodulated and decoded, and the voltage curve of the accelerometer is output. The voltage curve is processed by combining the accelerometer calibration data and the gain of the signal conditioning circuit to obtain the acceleration curve of the test model during the impact process.

[0015] Furthermore, the acceleration sensor is an accelerometer with a measurement range of not less than 10,000g; the signal conditioning module includes a signal amplification and filtering circuit, the acquisition and recording module includes an AD sampling circuit, and the power supply module includes a battery; Among them, the accelerometer's range is 50% or more higher than the estimated peak acceleration generated by the collision; the sampling period of the AD sampling circuit is shorter than the duration of the collision process, and the sampling rate is set to the higher value of the AD sampling circuit. The higher the sampling rate, the more collision process history data are obtained.

[0016] Furthermore, the wireless receiving device receives, within a 100-meter radius of the collision point, an analog signal transmitted by the accelerometer with a code rate of not less than 2 Mbps at a sampling rate of not less than 100 kHz and an accuracy of not less than 8 bits; synchronously samples and digitizes the analog signal; and encodes the digitized digital signal in real time and buffers it in a buffer with a capacity of not less than 1 Mbit.

[0017] Furthermore, the digitization process combines the analog signal with the accelerometer's calibrated sensitivity and the gain parameters of the signal conditioning circuit. Using the formula "acceleration = voltage ÷ circuit gain ÷ accelerometer sensitivity", the analog signal is converted into a digital signal to obtain the acceleration value.

[0018] Example: Figure 2 As shown, this embodiment uses an air cannon firing model, which is a blunt-nosed model. An accelerometer 1 is installed on the central axis near the blunt end of the front section of the air cannon firing model. A measurement module 2 is installed on the central axis of the rear section of the air cannon firing model. Several centrally symmetrical transmitting antennas 3 are installed on the surface of the rear section of the air cannon firing model. The accelerometer's measurement range is 50000g; the battery capacity is 300mAh; the data transmission rate of the wireless transmission module is 2Mbps or higher; the AD sampling circuit has a sampling rate of 100kHz, a sampling accuracy of 8bit, and a buffer circuit capacity of 1Mbit. The wireless transmission distance in this embodiment is 100 meters; [The last sentence appears to be incomplete and possibly refers to obtaining data.] Figure 3 The acceleration curve of the air cannon firing model impacting the steel plate is shown below. Figure 3 It can be seen that by using wireless transmission, the acceleration data of the air cannon model hitting the steel plate can be obtained in real time. The peak acceleration exceeds 17,000g, and the collision process lasts for about 2ms.

[0019] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. For those skilled in the art, all features disclosed in the present invention, or all steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can be combined in any way without departing from the principles of the present invention. The present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A wireless method for measuring high g-force acceleration during a collision process, comprising the following steps: S10. Install the sensor and its supporting circuitry; An accelerometer, along with a signal conditioning module, an acquisition and recording module, and a power supply module, are placed inside the test model. S20. Install the transmitter and transmitting antenna; A transmitter is placed inside the test model. The transmitter includes a wireless transmission module for acquiring acceleration sensor data and a modulation circuit. Several transmitting antennas are installed on the surface of the test model, arranged in a centrally symmetrical manner. S30. Overload-resistant potting reinforcement for the measurement module; After debugging and confirming that each module is functioning normally, the signal conditioning module, acquisition and recording module, power supply module, and transmitter in the test model cavity are bundled together to form the measurement module. The measurement module is placed inside the titanium alloy shell, and epoxy resin is injected into the titanium alloy shell for primary potting. Then, the titanium alloy shell is placed on the central axis of the test model cavity, and polyurethane material is filled into the gaps in the test model cavity for secondary potting. The test model is then sealed, and the test model fabrication is complete. The overload resistance of the measurement module is improved by primary potting and secondary potting, avoiding damage to the measurement module caused by impact during collision, and realizing the overall buffering and stress isolation of the measurement module; The measurement module synchronously performs sensing, high-speed sampling, buffering, and wireless transmission of high-g acceleration analog signals. S40. Configure a wireless receiving device for impact data; Based on the wireless transmission distance of the test model, a wireless receiving device for impact data is configured outside the collision zone; the wireless receiving device includes a receiving antenna, connecting cables, and data processing equipment. S50. Perform acceleration data analysis and processing; The test model crashes into the target, and the wireless receiving device obtains the impact data. The received impact data simulation signal of the test model is demodulated and decoded, and the voltage curve of the accelerometer is output. The voltage curve is processed by combining the accelerometer calibration data and the gain of the signal conditioning circuit to obtain the acceleration curve of the test model during the impact process.

2. The wireless measurement method for high g-value acceleration during a collision process according to claim 1, characterized in that, The acceleration sensor is an accelerometer with a measurement range of not less than 10,000g; the signal conditioning module includes a signal amplification and filtering circuit, the acquisition and recording module includes an AD sampling circuit, and the power supply module includes a battery; Among them, the accelerometer's range is 50% or more higher than the estimated peak acceleration generated by the collision; the sampling period of the AD sampling circuit is shorter than the duration of the collision process, and the sampling rate is set to the higher value of the AD sampling circuit. The higher the sampling rate, the more collision process history data are obtained.

3. The wireless measurement method for high g-value acceleration during a collision process according to claim 2, characterized in that, The wireless receiving device receives analog signals transmitted by the accelerometer with a code rate of not less than 2 Mbps at a sampling rate of not less than 100 kHz and an accuracy of not less than 8 bits within a 100-meter range from the collision point; it synchronously samples and digitizes the analog signals; and it encodes the digitized digital signals in real time and buffers them in a buffer with a capacity of not less than 1 Mbit.

4. The wireless measurement method for high g-value acceleration during a collision process according to claim 3, characterized in that, The aforementioned digitization combines the analog signal with the accelerometer's calibrated sensitivity and the gain parameters of the signal conditioning circuit. Using the formula "accelerometer = voltage ÷ circuit gain ÷ accelerometer sensitivity", the analog signal is converted into a digital signal to obtain the acceleration value.

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