Firearm contact force testing method

Abstract

The invention discloses a firearm contact force testing method. Film pressure sensor units at a shoulder abutting position and a grip position are adhered to a medical film adhesive tape through a film pressure sensor system; a gunstock position force measuring unit and a grip position force measuring unit are specifically arranged and are respectively connected with a signal acquisition terminal; one end of a signal acquisition terminal is connected with the film pressure sensor, and the other end is connected with a signal processing computer; voltage signals input by the gunstock position sensor and the grip position sensor can be acquired through the signal acquisition terminal, and results are output to the signal processing computer; the medical-grade PU waterproof film is adopted to flexibly adhere and connect the film pressure testing unit with the gunstock position and the grip position, the influence of the shape of the force testing unit on the testing result can be effectively reduced, the touch feeling of the real firearm and human body contact position is simulated as much as possible, the testing state is close to the real state, and the testing efficiency is improved. And the accuracy and credibility of a test result are effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of ergonomic testing of firearm shooting states, and in particular to a firearm contact force testing method. Background Art

[0002] Firearms are important military equipment carried by soldiers. The comfort of using firearms is directly related to shooting accuracy and mission execution efficiency. The impact force of firearms on the human body during shooting is the main factor affecting shooting comfort. Therefore, it is crucial to consider the contact force of firearms on the human body during shooting in the design of firearms.

[0003] Traditional firearm ergonomics evaluation mainly adopts subjective evaluation methods and lacks objective evaluation data. Domestic firearm contact force testing mostly uses rigid force measuring elements, which cannot accurately simulate the actual contact state, resulting in inaccurate test results and affecting shooting comfort. Summary of the invention

[0004] The present invention provides a firearm contact force testing method, which can effectively solve the problem mentioned in the above background technology that traditional firearm ergonomics evaluation mainly adopts subjective evaluation methods and lacks objective evaluation data, and the domestic firearm contact force testing field mostly adopts rigid force measuring elements, which cannot accurately simulate the real contact state, resulting in inaccurate test results and affecting shooting comfort.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a firearm contact force testing method, which uses a thin film pressure unit to collect the contact pressure of the shoulder and grip positions during the shooting process of the firearm, and uses objective data to quantitatively evaluate the ergonomic performance of the firearm;

[0006] The specific steps include:

[0007] Step 1: Pasting the thin film pressure sensor units at the shoulder and the handle with the medical film tape through the thin film pressure sensor system;

[0008] Step 2: Arrange the force measuring unit at the butt position and the force measuring unit at the grip position, and connect them to the signal acquisition terminal respectively;

[0009] Step 3, connecting one end of the signal acquisition terminal to the thin film pressure sensor, and the other end to the signal processing computer;

[0010] Step 4: The voltage signals input by the butt position sensor and the grip position sensor can be collected through the signal collection terminal, and the results are output to the signal processing computer;

[0011] Step 5: Use a signal processing computer to receive, analyze and display the voltage value of the shoulder position sensor and the voltage value of the grip position sensor collected by the signal acquisition terminal.

[0012] According to the above technical solution, in step one, a thin film pressure sensor is specifically placed between the relevant positions of the buttstock, the grip and the human body through medical film tape, and the thin film pressure sensors at the corresponding positions are used to test the impact force of the buttstock on the human shoulder and the force of the grip on the human palm during the shooter's different shooting postures.

[0013] According to the above technical solution, the thin film pressure sensor is a resistive pressure sensor, which mainly uses the pressure-dividing effect of the thin film to convert the pressure change into the resistance change, thereby converting the pressure change into an electrical signal. After the force measuring position is pressurized, the resistance value changes. This change can be measured by an external circuit and converted into a current or voltage signal to represent the pressure applied by the external medium. A single thin film pressure sensor can measure the pressure of a certain area. An area is divided into multiple small blocks. For each block, the pressure on it is measured by a thin film pressure sensor. The pressure distribution of the entire area can be obtained by combining them together;

[0014] In order to fully measure the pressure on an entire area, the thin film piezoelectric sensor covers all the area. At the same time, the pressure distribution on a single piezoelectric sensor is uniform. The smaller the area of ​​a single sensor and the more sensors there are, the better it can reflect the pressure distribution on the area.

[0015] The component pressure information is obtained according to the component resistance information, and the overall pressure value of the target position is obtained from the multiple position pressures indicated by the component pressure information. The component voltage value information is used to indicate the pressure exerted on each sensing element on the sensing film. The force measuring element outputs the voltage value to the signal processing computer through the signal acquisition terminal and displays it.

[0016] According to the above technical solution, the thin-film pressure sensor system tests the impact force of the butt on the human body and the force of the grip on the human hand during shooting, and specifically includes: a butt position force measuring unit and a grip position force measuring unit;

[0017] The butt position force measuring unit is used to test the impact force of the butt on the contact position of the human body during shooting, and the grip position force measuring unit is used to test the force of the grip on the contact position of the shooter's hand during shooting.

[0018] According to the above technical solution, in the step 2, during the specific arrangement of the butt position force measuring unit and the grip position force measuring unit, the butt position force measuring unit includes 12 6*2 arranged thin film pressure sensor force measuring ends, which are adhered to the butt end surface through a medical grade PU waterproof film, covering the butt end surface in contact with the human body, and the other end of the thin film pressure sensor is connected to the signal acquisition terminal;

[0019] The grip position force measuring unit includes 4 thin film pressure sensor force measuring ends, which are adhered to the grip around the medical grade PU waterproof film, covering the front, rear and side positions of the gun grip, and the other end of the thin film pressure sensor is connected to the signal acquisition terminal.

[0020] According to the above technical solution, in step three, the thin film pressure sensor is specifically connected to the signal processing computer through the signal acquisition terminal, so that one end of the signal acquisition terminal is connected to the thin film pressure sensor and the other end is connected to the signal processing computer.

[0021] According to the above technical solution, the step 4 specifically refers to receiving the impact force of the firearm on the shooter's shoulder and the reaction force of the human shoulder on the butt position collected by the thin film pressure sensor at the shoulder position, and the interaction force between the inside of the shooter's hand and the grip position collected by the thin film pressure sensor at the grip position through the signal acquisition terminal;

[0022] The signal acquisition terminals are two 8-channel signal acquisition boxes on one side, which can realize the signal acquisition of 16 thin film pressure sensors at the same time. The other side of the two signal acquisition terminals is a USB signal output port, which can realize digital signal output and display by connecting to a signal processing computer.

[0023] According to the above technical solution, in step 5, the signal processing computer and the data acquisition terminal are connected via a USB data cable to analyze the voltage data detected by the shoulder position force measuring unit and the grip position force measuring unit, and display the contact force curve obtained after processing on the display screen of the signal processing computer;

[0024] In the specific processing process, after receiving the voltage data from the data acquisition terminal, the signal processing computer performs approximate linear fitting in each voltage range based on the amplification factor k and offset b of the pressure value of each sensor relative to the voltage value obtained by the pressure sensor calibration system. Through the pressure-voltage function: F=kU+b, combined with the voltage value measured at the sensor, the pressure value at that position is calculated to achieve the corresponding conversion between voltage and pressure.

[0025] According to the above technical solution, the pressure sensor calibration system includes a sensor placement platform, a tension and compression dynamometer and a wheel dynamometer high and low position adjustment device, which functions to calibrate the approximate linear function of the pressure value and voltage value of each test pressure sensor, and obtain the amplification factor k and offset b in the F(U) function, thereby realizing voltage-pressure data conversion.

[0026] According to the above technical solution, the pressure sensor pressure-voltage calibration process of the pressure sensor calibration system is as follows:

[0027] First, clamp the sensor force measuring patch on the sensor placement platform and the end face of the tension and compression dynamometer, and control the pressure value on the sensor force measuring end by rotating the wheel. At the same time, read the voltage reading of the pressure sensor through the computer.

[0028] Through the above steps, 15-20 pressure values ​​are taken at equal intervals within the threshold range of the force measuring element, and the voltage value corresponding to each pressure value is obtained. The corresponding data of the pressure value and the voltage value are summarized, and the pressure-voltage corresponding function F(U) corresponding to each sensor is fitted through data processing software to realize the corresponding conversion of voltage-pressure.

[0029] Compared with the prior art, the present invention has the following beneficial effects: the present invention uses a medical-grade PU waterproof film to flexibly bond and connect the thin-film pressure test unit with the butt and grip positions, which can effectively reduce the influence of the shape of the force measuring unit on the test results, simulate the touch of the contact position between the real firearm and the human body as much as possible, make the test state close to the real state, improve the accuracy and credibility of the test results, and improve the scientificity and rationality of the ergonomics evaluation of the shooting process;

[0030] The thin film pressure sensor unit and the signal acquisition terminal are connected by wired flexibly, so it will not affect the human body's gun holding action. It can be used for rifle shooting contact force test and pistol shooting contact force test in various shooting postures, and realize gun holding contact force test in various different postures such as standing, kneeling, lying, etc.

[0031] In addition, the sensor used is a film sensor with an ultra-thin and flexible design. At the same time, the sensor and the firearm-related positions are flexibly pasted, which can effectively reduce the influence of the shape of the force measuring unit on the test results, and simulate the actual shooting person-gun contact state as much as possible, making the test results more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0033] In the attached picture:

[0034] Figure 1 It is a schematic diagram of the flow of the firearm contact force test of the present invention;

[0035] Figure 2 is a schematic diagram of a firearm contact force test environment of the present invention;

[0036] Figure 3 is a schematic diagram of a typical contact force test firearm of the present invention;

[0037] Figure 4 It is a schematic diagram of the principle of the resistive film pressure sensor of the present invention;

[0038] Figure 5 is a schematic diagram of a signal acquisition terminal of a thin film pressure sensor of the present invention;

[0039] Figure 6 is a schematic diagram of a thin film pressure sensor calibration system of the present invention;

[0040] Figure 7 It is a schematic diagram of the layout of the thin film pressure sensors at the butt and grip positions of the present invention;

[0041] Figure 8 It is a schematic diagram of the contact force test of the firearm shoulder and grip position in the standing shooting state of the present invention;

[0042] Fig. 9 It is a schematic diagram of the contact force test of the gun shoulder and grip position in the kneeling shooting state of the present invention;

[0043] Fig.10 It is a schematic diagram of the contact force test of the firearm shoulder and grip position in prone shooting state of the present invention;

[0044] Fig.11 is a schematic diagram of a contact pressure test of a pistol of the present invention;

[0045] Fig.12 It is a schematic diagram of the contact pressure test results of the firearm of the present invention. DETAILED DESCRIPTION

[0046] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0047] Example: Figure 1-2 As shown, the present invention provides a technical solution, a firearm contact force testing method, which uses a film pressure unit to collect the contact pressure of the shoulder and grip positions during the firearm shooting process, and uses objective data to quantitatively evaluate the ergonomic performance of the firearm;

[0048] The specific steps include:

[0049] Step 1: Pasting the thin film pressure sensor units at the shoulder and the handle with the medical film tape through the thin film pressure sensor system;

[0050] Step 2: Arrange the force measuring unit at the butt position and the force measuring unit at the grip position, and connect them to the signal acquisition terminal respectively;

[0051] Step 3, connecting one end of the signal acquisition terminal to the thin film pressure sensor, and the other end to the signal processing computer;

[0052] Step 4: The voltage signals input by the butt position sensor and the grip position sensor can be collected through the signal collection terminal, and the results are output to the signal processing computer;

[0053] Step 5: Use a signal processing computer to receive, analyze and display the voltage value of the shoulder position sensor and the voltage value of the grip position sensor collected by the signal acquisition terminal.

[0054] Based on the above technical solution, in step one, a thin film pressure sensor is specifically placed between the relevant positions of the buttstock, the grip and the human body through medical film tape, and the thin film pressure sensors at the corresponding positions are used to test the impact force of the buttstock on the human shoulder and the force of the grip on the human palm during the shooter's different shooting postures.

[0055] Based on the above technical solution, the thin film pressure sensor is a resistive pressure sensor, which mainly uses the pressure-dividing effect of the thin film to convert pressure changes into resistance changes, thereby converting pressure changes into electrical signals. The resistance value changes after the force measuring position is pressurized. This change can be measured by an external circuit and converted into a current or voltage signal to represent the pressure applied by the external medium. A single thin film pressure sensor can measure the pressure of a certain area. An area is divided into multiple small blocks. For each block, the pressure on it is measured by a thin film pressure sensor. The pressure distribution of the entire area can be obtained by combining them together, such as Figure 4 As shown;

[0056] In order to fully measure the pressure on an entire area, the thin film piezoelectric sensor covers all the area. At the same time, the pressure distribution on a single piezoelectric sensor is uniform. The smaller the area of ​​a single sensor and the more sensors there are, the better it can reflect the pressure distribution on the area.

[0057] The component pressure information is obtained according to the component resistance information, and the overall pressure value of the target position is obtained from the multiple position pressures indicated by the component pressure information. The component voltage value information is used to indicate the pressure of each sensing element on the sensing film. The force measuring element outputs the voltage value to the signal processing computer through the signal acquisition terminal and displays it. Figure 3 shown.

[0058] Based on the above technical solution, the thin-film pressure sensor system tests the impact force of the buttstock on the human body and the force of the grip on the human hand during shooting, specifically including: a buttstock position force measuring unit and a grip position force measuring unit;

[0059] The butt position force measuring unit is used to test the impact force of the butt on the contact position of the human body during shooting, and the grip position force measuring unit is used to test the force of the grip on the contact position of the shooter's hand during shooting.

[0060] Based on the above technical solution, in step 2, during the specific arrangement of the butt position force measuring unit and the grip position force measuring unit, the butt position force measuring unit includes 12 6*2 arranged thin film pressure sensor force measuring ends, which are adhered to the butt end surface through a medical grade PU waterproof film, covering the butt end surface in contact with the human body, and the other end of the thin film pressure sensor is connected to the signal acquisition terminal. The layout of the 12 force measuring units is as follows: Figure 7 As shown;

[0061] The grip position force measuring unit includes 4 thin film pressure sensor force measuring ends, which are adhered to the grip around the medical grade PU waterproof film, covering the front, back and side positions of the gun grip. The other end of the thin film pressure sensor is connected to the signal acquisition terminal. The layout of the 4 force measuring units is as follows: Figure 7 shown.

[0062] Based on the above technical solution, in step three, specifically, the thin film pressure sensor is connected to the signal processing computer through the signal acquisition terminal, so that one end of the signal acquisition terminal is connected to the thin film pressure sensor, and the other end is connected to the signal processing computer.

[0063] Based on the above technical solution, step 4 specifically refers to receiving the impact force of the firearm on the shooter's shoulder and the reaction force of the human shoulder on the butt position collected by the thin film pressure sensor at the shoulder position, and the interaction force between the shooter's hand inner side and the grip position collected by the thin film pressure sensor at the grip position through the signal acquisition terminal, such as Figure 8-11 As shown;

[0064] The signal acquisition terminals are two 8-channel signal acquisition boxes on one side, which can realize the signal acquisition of 16 thin film pressure sensors at the same time. The other side of the two signal acquisition terminals is a USB signal output port, which can be connected to the signal processing computer to realize digital signal output and display. Figure 5 shown.

[0065] Based on the above technical solution, in step 5, the signal processing computer and the data acquisition terminal are connected via a USB data cable to analyze the voltage data detected by the shoulder position force measuring unit and the grip position force measuring unit, and display the contact force curve obtained after processing on the display screen of the signal processing computer, such as Fig.12 As shown;

[0066] In the specific processing process, after receiving the voltage data from the data acquisition terminal, the signal processing computer performs approximate linear fitting in each voltage range based on the amplification factor k and offset b of the pressure value of each sensor relative to the voltage value obtained by the pressure sensor calibration system. Through the pressure-voltage function: F=kU+b, combined with the voltage value measured at the sensor, the pressure value at that position is calculated to achieve the corresponding conversion between voltage and pressure.

[0067] Based on the above technical solution, the pressure sensor calibration system includes a sensor placement platform, a tension and compression dynamometer, and a high and low position adjustment device for the wheel dynamometer. Its function is to calibrate the approximate linear function of the pressure value and voltage value of each test pressure sensor, and obtain the amplification factor k and offset b in the F(U) function, thereby realizing the voltage-pressure data conversion, such as Figure 6 shown.

[0068] Based on the above technical solution, the pressure sensor pressure-voltage calibration process of the pressure sensor calibration system is as follows:

[0069] First, clamp the sensor force measuring patch on the sensor placement platform and the end face of the tension and compression dynamometer, and control the pressure value on the sensor force measuring end by rotating the wheel. At the same time, read the voltage reading of the pressure sensor through the computer.

[0070] Through the above steps, 18 pressure values ​​are taken at equal intervals within the threshold range of the force measuring element, and the voltage value corresponding to each pressure value is obtained. The corresponding data of the pressure value and the voltage value are summarized, and the pressure-voltage corresponding function F(U) corresponding to each sensor is fitted through data processing software to realize the corresponding conversion of voltage-pressure.

[0071] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A firearm contact force testing method, characterized in that: By using a film pressure unit to collect the contact pressure of the shoulder and grip during the shooting process of the firearm, the ergonomic performance of the firearm is quantitatively evaluated using objective data; The specific steps include: Step 1: Pasting the thin film pressure sensor units at the shoulder and the handle with the medical film tape through the thin film pressure sensor system; Step 2: Arrange the force measuring unit at the butt position and the force measuring unit at the grip position, and connect them to the signal acquisition terminal respectively; Step 3, connecting one end of the signal acquisition terminal to the thin film pressure sensor, and the other end to the signal processing computer; Step 4: The voltage signals input by the butt position sensor and the grip position sensor can be collected through the signal collection terminal, and the results are output to the signal processing computer; Step 5: Use a signal processing computer to receive, analyze and display the voltage value of the shoulder position sensor and the voltage value of the grip position sensor collected by the signal acquisition terminal.

2. A firearm contact force testing method according to claim 1, characterized in that: In the step 1, a thin film pressure sensor is placed between the relevant positions of the buttstock, the grip and the human body through medical film tape, and the thin film pressure sensors at the corresponding positions are used to test the impact force of the buttstock on the human shoulder and the force of the grip on the human palm during the shooter's different shooting postures.

3. A firearm contact force testing method according to claim 2, characterized in that: The thin film pressure sensor is a resistive pressure sensor, which mainly uses the pressure-dividing effect of the thin film to convert pressure changes into resistance changes, thereby converting pressure changes into electrical signals. After the force measuring position is pressurized, the resistance value changes. This change can be measured by an external circuit and converted into a current or voltage signal to represent the pressure applied by the external medium. A single thin film pressure sensor can measure the pressure of a certain area. An area is divided into multiple small blocks. For each block, the pressure on it is measured by a thin film pressure sensor. The pressure distribution of the entire area can be obtained by combining them together; The component pressure information is obtained according to the component resistance information, and the overall pressure value of the target position is obtained from the multiple position pressures indicated by the component pressure information. The component voltage value information is used to indicate the pressure exerted on each sensing element on the sensing film. The force measuring element outputs the voltage value to the signal processing computer through the signal acquisition terminal and displays it.

4. A firearm contact force testing method according to claim 2, characterized in that: The thin-film pressure sensor system tests the impact force of the buttstock on the human body and the force of the grip on the human hand during shooting, and specifically includes: a buttstock position force measuring unit and a grip position force measuring unit; The butt position force measuring unit is used to test the impact force of the butt on the contact position of the human body during shooting, and the grip position force measuring unit is used to test the force of the grip on the contact position of the shooter's hand during shooting.

5. A firearm contact force testing method according to claim 4, characterized in that: In the step 2, during the specific arrangement of the butt position force measuring unit and the grip position force measuring unit, the butt position force measuring unit includes 12 thin film pressure sensor force measuring ends arranged in 6*2, which are adhered to the butt end surface through a medical-grade PU waterproof film, covering the end surface of the butt contacting the human body, and the other end of the thin film pressure sensor is connected to the signal acquisition terminal; The grip position force measuring unit includes 4 thin film pressure sensor force measuring ends, which are adhered to the grip around the medical grade PU waterproof film, covering the front, rear and side positions of the gun grip, and the other end of the thin film pressure sensor is connected to the signal acquisition terminal.

6. A firearm contact force testing method according to claim 1, characterized in that: The step three specifically refers to connecting the thin film pressure sensor to the signal processing computer through the signal acquisition terminal, so that one end of the signal acquisition terminal is connected to the thin film pressure sensor and the other end is connected to the signal processing computer.

7. A firearm contact force testing method according to claim 6, characterized in that: The step 4 specifically refers to receiving the impact force of the firearm on the shooter's shoulder and the reaction force of the human shoulder on the butt position collected by the thin film pressure sensor at the shoulder position, and the interaction force between the shooter's hand inner side and the grip position collected by the thin film pressure sensor at the grip position through the signal acquisition terminal; The signal acquisition terminals are two 8-channel signal acquisition boxes on one side, which can realize the signal acquisition of 16 thin film pressure sensors at the same time. The other side of the two signal acquisition terminals is a USB signal output port, which can realize digital signal output and display by connecting to a signal processing computer.

8. A firearm contact force testing method according to claim 7, characterized in that: In the step 5, the signal processing computer is connected to the data acquisition terminal via a USB data cable to analyze the voltage data detected by the shoulder position force measuring unit and the grip position force measuring unit, and display the contact force curve obtained after processing on the display screen of the signal processing computer; In the specific processing process, after receiving the voltage data from the data acquisition terminal, the signal processing computer combines the amplification factor k and the offset b of the pressure value of each sensor relative to the voltage value obtained by the pressure sensor calibration system, and performs approximate linear fitting within each voltage range. Through the pressure-voltage function: F=kU+b, combined with the voltage value measured at the sensor, the pressure value at that position is calculated to achieve the corresponding conversion between voltage and pressure.

9. A firearm contact force testing method according to claim 8, characterized in that: The pressure sensor calibration system includes a sensor placement platform, a tension and compression dynamometer, and a high and low position adjustment device for the wheel dynamometer. Its function is to calibrate the approximate linear function of the pressure value and voltage value of each test pressure sensor, obtain the amplification factor k and offset b in the F(U) function, and thus realize voltage-pressure data conversion.

10. A firearm contact force testing method according to claim 9, characterized in that: The pressure sensor pressure-voltage calibration process of the pressure sensor calibration system is as follows: First, clamp the sensor force measuring patch on the sensor placement platform and the end face of the tension and compression dynamometer, and control the pressure value on the sensor force measuring end by rotating the wheel. At the same time, read the voltage reading of the pressure sensor through the computer. Through the above steps, 15-20 pressure values ​​are taken at equal intervals within the threshold range of the force measuring element, and the voltage value corresponding to each pressure value is obtained. The corresponding data of the pressure value and the voltage value are summarized, and the pressure-voltage corresponding function F(U) corresponding to each sensor is fitted through data processing software to realize the corresponding conversion of voltage-pressure.

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