Test dummy chest displacement measurement method and apparatus, electronic device and medium

Abstract

A test dummy chest displacement measurement method, applied to a test dummy chest displacement measurement device. The method comprises: using the point of a universal joint connected to a chest rib of a test dummy as a measurement point, and acquiring design parameters of a measurement device in a pre-established coordinate system, and initial angles of a first angle sensor (1), a second angle sensor (2) and a third angle sensor (3) in the measurement device (S101); using the point of the center of a rotating shaft of the universal joint connected to the chest rib of the test dummy as a measurement point and, on the basis of the design parameters and the initial angles of the first angle sensor (1), the second angle sensor (2) and the third angle sensor (3), determining the initial coordinates of the measurement point when the chest of the test dummy does not take the impact (S102); after the chest of the test dummy has taken the impact, acquiring the current angles of the first angle sensor (1), the second angle sensor (2) and the third angle sensor (3) in the measurement device (S103); on the basis of the current angles of the first angle sensor (1), the second angle sensor (2) and the third angle sensor (3), determining the current coordinates of the measurement point when the chest of the test dummy takes the impact (S104); and, on the basis of the initial coordinates of the measurement point and the current coordinates of the measurement point, obtaining the three-dimensional compression displacement of the chest of the test dummy (S105). The measurement method can improve the accuracy of measuring the chest deformation of dummies. In addition, further provided are a test dummy chest displacement measurement apparatus, an electronic device and a computer-readable storage medium.

Description

Method, device, electronic equipment and medium for measuring chest displacement of test dummy

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 2023111526772 filed with the Chinese Patent Office on September 7, 2023, entitled “Method, device, electronic equipment and medium for measuring chest displacement of a test dummy”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of collision testing, and in particular to a method, device, electronic equipment, and medium for measuring chest displacement of a test dummy. Background Art

[0004] Crash dummies are crucial instruments for evaluating the passive safety performance of passenger vehicles (such as cars, trains, and aircraft). By combining biomechanical injury criteria with simulated crash tests, they assess the occupant protection of passenger vehicles, ultimately improving their safety. The human chest is particularly vulnerable to injury, so testing the deformation of the dummy's chest during impact is crucial for improving passenger vehicle safety.

[0005] Currently, most existing crash test dummy chest displacement measurements are performed using unidirectional displacement sensors, such as pendulum-type, telescopic rod-type, and pull-wire-type sensors. These simple measurement methods can only reflect the displacement of the dummy's chest in a specific direction after an impact, thereby examining the chest injuries of real people. However, this measurement method only reflects the displacement of the ribs in a specific direction when the dummy's chest is impacted. This mismatch between the measured displacement and the real scene leads to inaccurate displacement results, which in turn affects the assessment of real-life chest injuries. Therefore, accurately measuring the spatial displacement of the dummy's chest during an impact has become an urgent problem to be solved.

[0006] Summary of the Invention

[0007] In view of this, the purpose of this application is to provide a method, device, electronic equipment and medium for measuring the displacement of a test dummy's chest. The method can determine the compressive displacement components of the dummy's chest in three directions through a simple measuring device composed of three angle sensors to measure the changes in the compressive displacement of the dummy's chest ribs, more realistically reflect the biological response of the chest when it is impacted, and improve the accuracy of measuring the deformation of the dummy's chest.

[0008] This application mainly includes the following aspects:

[0009] In a first aspect, embodiments of the present application provide a method for measuring the chest displacement of a test dummy, which is applied to a device for measuring the chest displacement of a test dummy. The device comprises a first angle sensor, a second angle sensor, a third angle sensor, a universal joint, a first swing arm, and a second swing arm. The third angle sensor, the second angle sensor, the second swing arm, the first angle sensor, the first swing arm, and the universal joint are connected in sequence, and the front end of the universal joint is connected to the ribs of the test dummy's chest. The measurement method includes:

[0010] Acquiring design parameters of the measuring device in a pre-established coordinate system, and initial angles of a first angle sensor, a second angle sensor, and a third angle sensor in the measuring device;

[0011] Using the point where the center of the universal joint's rotation axis connects to the ribs of the test dummy's chest as a measurement point, and determining the initial coordinates of the measurement point when the test dummy's chest is not impacted based on the design parameters and the initial angles of the first angle sensor, the second angle sensor, and the third angle sensor;

[0012] After the chest of the test dummy is impacted, obtaining current angles of the first angle sensor, the second angle sensor, and the third angle sensor in the measuring device;

[0013] determining, based on current angles of the first angle sensor, the second angle sensor, and the third angle sensor, current coordinates of the measurement point when the chest of the test dummy is impacted;

[0014] Based on the initial coordinates of the measurement points and the current coordinates of the measurement points, a three-dimensional displacement of the compressed chest of the test dummy is obtained.

[0015] Furthermore, the design parameters include a first distance, a second distance, a third distance, and a target distance; the first distance is a vertical distance from the axis of the first angle sensor to the center of the rotating shaft of the universal joint; the second distance is a vertical distance from the axis of the first angle sensor to the axis of the second angle sensor; the third distance is a vertical distance from the axis of the second angle sensor to the axis of the third angle sensor; and the target distance is a vertical distance from the axis of the second angle sensor to the X-axis of the coordinate system; and the step of determining the initial coordinates of the measurement point when the chest of the test dummy is not impacted based on the design parameters and the initial angles of the first angle sensor, the second angle sensor, and the third angle sensor comprises:

[0016] Substituting the first distance, the second distance, and the initial angles of the first angle sensor, the second angle sensor, and the third angle sensor into a first preset formula to obtain an initial horizontal axis coordinate;

[0017] Substituting the first distance, the second distance, the target distance, the initial angle of the first angle sensor, and the initial angle of the third angle sensor into a second preset formula to obtain an initial vertical axis coordinate; wherein the first angle sensor measures the angle between the first swing arm and the second swing arm; the second angle sensor measures the angle between the axis of the second angle sensor's rotation shaft and the Z axis; and the third angle sensor measures the angle between the second swing arm and the X axis;

[0018] Substituting the first distance, the second distance, the third distance, and the initial angles of the first angle sensor, the second angle sensor, and the third angle sensor into a third preset formula to obtain an initial vertical axis coordinate;

[0019] A combination of the initial horizontal axis coordinate, the initial vertical axis coordinate, and the initial vertical axis coordinate is determined as the initial coordinate of the measurement point when the chest of the test dummy is not impacted.

[0020] Furthermore, the step of determining the current coordinates of the measurement point when the chest of the test dummy is impacted based on the current angles of the first angle sensor, the second angle sensor, and the third angle sensor includes:

[0021] Substituting the first distance, the second distance, and the current angles of the first angle sensor, the second angle sensor, and the third angle sensor into a fourth preset formula to obtain a current horizontal axis coordinate;

[0022] Substituting the first distance, the second distance, the target distance, the current angle of the first angle sensor, and the current angle of the third angle sensor into a fifth preset formula to obtain a current vertical axis coordinate;

[0023] Substituting the first distance, the second distance, the third distance, and the current angles of the first angle sensor, the second angle sensor, and the third angle sensor into a sixth preset formula to obtain a current vertical axis coordinate;

[0024] A combination of the current horizontal axis coordinate, the current vertical axis coordinate, and the current vertical axis coordinate is determined as the current coordinate of the measurement point when the chest of the test dummy is impacted.

[0025] Furthermore, the first preset formula is the formula when the measurement time parameter in the fourth preset formula is zero; the second preset formula is the formula when the measurement time parameter in the fifth preset formula is zero; and the third preset formula is the formula when the measurement time parameter in the sixth preset formula is zero.

[0026] Furthermore, the step of obtaining the three-dimensional displacement of the compressed chest of the test dummy based on the initial coordinates of the measurement points and the current coordinates of the measurement points includes:

[0027] determining a difference between a current horizontal axis coordinate in the current coordinates of the measuring point and an initial horizontal axis coordinate in the initial coordinates of the measuring point as a current horizontal displacement;

[0028] determining a difference between a current longitudinal axis coordinate in the current coordinates of the measuring point and an initial longitudinal axis coordinate in the initial coordinates of the measuring point as a current longitudinal displacement;

[0029] determining a difference between a current vertical axis coordinate in the current coordinates of the measuring point and an initial vertical axis coordinate in the initial coordinates of the measuring point as a current vertical displacement;

[0030] A combination of the current lateral displacement, the current longitudinal displacement, and the current vertical displacement is determined as a three-dimensional displacement of the compressed chest of the test dummy.

[0031] Furthermore, the measuring method further includes:

[0032] Obtaining a three-dimensional displacement of the compressed left upper rib of the test dummy's chest by a measuring device belonging to a universal joint connected to the left upper rib of the test dummy;

[0033] Obtaining a three-dimensional displacement of the compressed left lower rib of the test dummy's chest by a measuring device belonging to a universal joint connected to the left lower rib of the test dummy;

[0034] Obtaining a three-dimensional displacement of the compressed right upper rib of the test dummy's chest by a measuring device belonging to a universal joint connected to the right upper rib of the test dummy;

[0035] Obtaining a three-dimensional displacement of the right lower rib of the test dummy's chest when compressed by a universal joint connected to the right lower rib of the test dummy using a measuring device belonging to the universal joint connected to the right lower rib of the test dummy;

[0036] Determining an average displacement of the chest compression of the test dummy by the three-dimensional displacement of the compressed left upper rib, the three-dimensional displacement of the compressed left lower rib, the three-dimensional displacement of the compressed right upper rib, and the three-dimensional displacement of the compressed right lower rib of the chest of the test dummy;

[0037] Determining whether the average displacement of the chest of the test dummy when compressed is within a preset chest calibration displacement range;

[0038] If so, the bionic performance of the chest of the test dummy is determined to be up to standard.

[0039] In a second aspect, embodiments of the present application further provide a device for measuring the chest displacement of a test dummy, which is used in measuring equipment for the chest displacement of a test dummy. The device comprises a first angle sensor, a second angle sensor, a third angle sensor, a universal joint, a first swing arm, and a second swing arm. The third angle sensor, the second angle sensor, the second swing arm, the first angle sensor, the first swing arm, and the universal joint are connected in sequence, and the front end of the universal joint is connected to the ribs of the test dummy's chest. The device comprises:

[0040] a first acquisition module, configured to acquire design parameters of the measuring device in a pre-established coordinate system, and initial angles of a first angle sensor, a second angle sensor, and a third angle sensor in the measuring device;

[0041] a first determination module, configured to use a point where the center of the universal joint's rotation axis connects to a rib on the test dummy's chest as a measurement point, and determine, based on the design parameters and initial angles of the first angle sensor, the second angle sensor, and the third angle sensor, initial coordinates of the measurement point when the test dummy's chest is not impacted;

[0042] a second acquisition module, configured to acquire current angles of the first angle sensor, the second angle sensor, and the third angle sensor in the measuring device after the chest of the test dummy is impacted;

[0043] a second determining module, configured to determine, based on current angles of the first angle sensor, the second angle sensor, and the third angle sensor, current coordinates of the measurement point when the chest of the test dummy is impacted;

[0044] The measuring module is used to obtain the three-dimensional displacement of the compressed chest of the test dummy based on the initial coordinates of the measuring point and the current coordinates of the measuring point.

[0045] Furthermore, the design parameters include a first distance, a second distance, a third distance, and a target distance; the first distance is a perpendicular distance from the axis of the first angle sensor to the center of the rotating shaft of the universal joint; the second distance is a perpendicular distance from the axis of the first angle sensor to the axis of the second angle sensor; the third distance is a perpendicular distance from the axis of the second angle sensor to the axis of the third angle sensor; and the target distance is a perpendicular distance from the axis of the second angle sensor to the X-axis of the coordinate system; when the first determination module is used to determine the initial coordinates of the measurement point when the chest of the test dummy is not impacted based on the design parameters and the initial angles of the first angle sensor, the second angle sensor, and the third angle sensor, the first determination module is specifically used to:

[0046] Substituting the first distance, the second distance, and the initial angles of the first angle sensor, the second angle sensor, and the third angle sensor into a first preset formula to obtain an initial horizontal axis coordinate;

[0047] Substituting the first distance, the second distance, the target distance, the initial angle of the first angle sensor, and the initial angle of the third angle sensor into a second preset formula to obtain an initial vertical axis coordinate; wherein the first angle sensor measures the angle between the first swing arm and the second swing arm; the second angle sensor measures the angle between the axis of the second angle sensor's rotation shaft and the Z axis; and the third angle sensor measures the angle between the second swing arm and the X axis;

[0048] Substituting the first distance, the second distance, the third distance, and the initial angles of the first angle sensor, the second angle sensor, and the third angle sensor into a third preset formula to obtain an initial vertical axis coordinate;

[0049] A combination of the initial horizontal axis coordinate, the initial vertical axis coordinate, and the initial vertical axis coordinate is determined as the initial coordinate of the measurement point when the chest of the test dummy is not impacted.

[0050] In a third aspect, an embodiment of the present application further provides an electronic device comprising: a processor, a memory, and a bus, wherein the memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor and the memory communicate via the bus, and when the machine-readable instructions are executed by the processor, the steps of the method for measuring the chest displacement of a test dummy as described above are performed.

[0051] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the method for measuring chest displacement of a test dummy as described above are executed.

[0052] The embodiments of the present application provide a method, device, electronic device, and medium for measuring the chest displacement of a test dummy, which are applied to a device for measuring the chest displacement of a test dummy, wherein the device comprises a first angle sensor, a second angle sensor, a third angle sensor, a universal joint, a first swing arm, and a second swing arm, wherein the third angle sensor, the second angle sensor, the second swing arm, the first angle sensor, the first swing arm, and the universal joint are connected in sequence, and the front end of the universal joint is connected to the ribs of the chest of the test dummy; the measurement method comprises: obtaining design parameters of the measurement device in a pre-established coordinate system, and initial angles of the first angle sensor, the second angle sensor, and the third angle sensor in the measurement device; and setting the first angle sensor, the second angle sensor, and the third angle sensor in the measurement device to ... The point where the center of the universal joint's rotating shaft connects to the ribs of the test dummy's chest is used as a measurement point, and based on the design parameters and the initial angles of the first angle sensor, the second angle sensor, and the third angle sensor, the initial coordinates of the measurement point when the test dummy's chest is not impacted are determined; after the test dummy's chest is impacted, the current angles of the first angle sensor, the second angle sensor, and the third angle sensor in the measuring device are obtained; based on the current angles of the first angle sensor, the second angle sensor, and the third angle sensor, the current coordinates of the measurement point when the test dummy's chest is impacted are determined; and based on the initial coordinates of the measurement point and the current coordinates of the measurement point, the three-dimensional displacement of the compressed test dummy's chest is obtained.

[0053] In this way, the technical solution provided by the present application can determine the compressive displacement components of the dummy's chest in three directions through a simple measuring device composed of three angle sensors to measure the compressive displacement changes of the dummy's chest ribs, more realistically reflecting the biological response of the chest when impacted, and improving the accuracy of measuring the deformation of the dummy's chest.

[0054] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0056] FIG1 shows a flow chart of a method for measuring chest displacement of a test dummy provided in an embodiment of the present application;

[0057] FIG2 shows a flow chart of another method for measuring chest displacement of a test dummy provided in an embodiment of the present application;

[0058] FIG3 is a schematic diagram showing a structure of a measuring device provided in an embodiment of the present application;

[0059] FIG4 shows one schematic diagram of a coordinate system provided in an embodiment of the present application;

[0060] FIG5 shows a second schematic diagram of a coordinate system provided in an embodiment of the present application;

[0061] FIG6 shows one of the schematic diagrams of a spatial geometry principle provided by an embodiment of the present application;

[0062] FIG7 shows a second schematic diagram of a spatial geometry principle provided by an embodiment of the present application;

[0063] FIG8 shows one structural diagram of a device for measuring chest displacement of a test dummy provided in an embodiment of the present application;

[0064] FIG9 shows a second structural diagram of a test dummy chest displacement measuring device provided in an embodiment of the present application;

[0065] FIG10 shows a schematic structural diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0066] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of illustration and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowcharts can be implemented out of sequence, and steps without logical context can be reversed or implemented simultaneously. In addition, those skilled in the art, under the guidance of the contents of this application, can add one or more other operations to the flowchart, or remove one or more operations from the flowchart.

[0067] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0068] In order to enable those skilled in the art to use the contents of this application, the following implementation method is provided in combination with the specific application scenario "measurement of chest displacement of a test dummy". For those skilled in the art, the general principles defined herein can be applied to other embodiments and application scenarios without departing from the spirit and scope of this application.

[0069] The following methods, devices, electronic devices, or computer-readable storage media of the embodiments of the present application can be applied to any scenario requiring measurement of the chest displacement of a test dummy. The embodiments of the present application are not limited to specific application scenarios. Any solution using the test dummy chest displacement measurement method, device, electronic device, and storage medium provided in the embodiments of the present application is within the scope of protection of this application.

[0070] It's worth noting that crash dummies are crucial for evaluating the passive safety performance of passenger vehicles (such as cars, trains, and airplanes). This is achieved by evaluating the occupant protection of passenger vehicles using biomechanical injury criteria in simulated crash tests, thereby continuously improving the safety of these vehicles. The human chest is a particularly vulnerable area to injury, so testing the deformation of the dummy's chest during impact is crucial for improving the safety of passenger vehicles.

[0071] Currently, most existing crash test dummy chest displacement measurements are performed using unidirectional displacement sensors, such as pendulum-type, telescopic rod-type, and pull-wire-type sensors. These simple measurement methods can only reflect the displacement of the dummy's chest in a specific direction after an impact, thereby examining the chest injuries of real people. However, this measurement method only reflects the displacement of the ribs in a specific direction when the dummy's chest is impacted. This mismatch between the measured displacement and the real scene leads to inaccurate displacement results, which in turn affects the assessment of real-life chest injuries. Therefore, accurately measuring the spatial displacement of the dummy's chest during an impact has become an urgent problem to be solved.

[0072] Based on this, the present application proposes a method, device, electronic equipment and medium for measuring the chest displacement of a test dummy, which are applied to the measuring equipment for the chest displacement of a test dummy, the measuring equipment consisting of a first angle sensor, a second angle sensor, a third angle sensor, a universal joint, a first swing arm and a second swing arm, the third angle sensor, the second angle sensor, the second swing arm, the first angle sensor, the first swing arm and the universal joint are connected in sequence, and the front end of the universal joint is connected to the ribs of the chest of the test dummy; the measuring method comprises: obtaining the design parameters of the measuring equipment in a pre-established coordinate system, and the initial angles of the first angle sensor, the second angle sensor and the third angle sensor in the measuring equipment; The point where the center of the rotation axis of the universal joint is connected to the ribs of the test dummy's chest is used as a measurement point, and based on the design parameters and the initial angles of the first angle sensor, the second angle sensor, and the third angle sensor, the initial coordinates of the measurement point when the test dummy's chest is not impacted are determined; after the test dummy's chest is impacted, the current angles of the first angle sensor, the second angle sensor, and the third angle sensor in the measuring device are obtained; based on the current angles of the first angle sensor, the second angle sensor, and the third angle sensor, the current coordinates of the measurement point when the test dummy's chest is impacted are determined; and based on the initial coordinates of the measurement point and the current coordinates of the measurement point, the three-dimensional displacement of the test dummy's chest due to compression is obtained.

[0073] In this way, the technical solution provided by the present application can determine the compressive displacement components of the dummy's chest in three directions through a simple measuring device composed of three angle sensors to measure the compressive displacement changes of the dummy's chest ribs, more realistically reflecting the biological response of the chest when impacted, and improving the accuracy of measuring the deformation of the dummy's chest.

[0074] To facilitate understanding of the present application, the technical solutions provided in the present application will be described in detail below in conjunction with specific embodiments.

[0075] Please refer to FIG1 , which is a flow chart of a method for measuring chest displacement of a test dummy provided in an embodiment of the present application. As shown in FIG1 , the measurement method includes:

[0076] S101, obtaining design parameters of the measuring device in a pre-established coordinate system, and initial angles of a first angle sensor, a second angle sensor, and a third angle sensor in the measuring device;

[0077] It should be noted that the measurement method provided in this embodiment is applied to a device for measuring the displacement of the chest of a test dummy. Please refer to FIG3 , which is a schematic diagram of the structure of a measurement device provided in an embodiment of the present application. As shown in FIG3 , the measurement device is composed of a first angle sensor 1, a second angle sensor 2, a third angle sensor 3, a universal joint 7, a first swing arm 4, a second swing arm 5, and a mounting base 6. The three angle sensors are fixed by a mounting component and connected by two swing arms (the first swing arm 4 and the second swing arm 5) and related connecting parts. The data fed back by the angle sensors can represent the displacement of the measurement point of the measurement device in the X, Y, and Z directions through spatial coordinate conversion. The mounting base 6 of the measurement device is fixed to the spine of the test dummy, the universal joint 7 at the front end of the first swing arm 4 is connected to the ribs of the test dummy, and the mounting base 6, the third angle sensor 3, the second angle sensor 2, the second swing arm 5, the first angle sensor 1, the first swing arm 4, and the universal joint 7 are connected in sequence.

[0078] As an example, please refer to Figures 4 and 5. Figure 4 is one of the schematic diagrams of a coordinate system provided in an embodiment of the present application, and Figure 5 is a second schematic diagram of a coordinate system provided in an embodiment of the present application. Figure 4 is a top view of the measuring device, and Figure 5 is a front view of the measuring device. As shown in Figures 4 and 5, the intersection of the center line of the rotating shaft of the third angle sensor 3 and the outer end surface of the mounting base 6 can be used as the coordinate origin, and the direction perpendicular to the center line of the rotating shaft of the third angle sensor 3 on the mounting plane parallel to the mounting base 6 is determined as the X-axis direction, the center line of the rotating shaft of the third angle sensor 3 is determined as the Y-axis, and the direction perpendicular to the mounting base 6 is determined as the Z-axis direction to establish a three-dimensional coordinate system. Here, the design parameters include the first distance L1, the second distance L2, the third distance L3 and the target distance r1; the first distance L1 is the vertical distance from the axis of the first angle sensor 1 to the rotation center of the universal joint 7; the second distance L2 is the vertical distance from the axis of the first angle sensor 1 to the axis of the second angle sensor 2; the third distance L3 is the vertical distance from the axis of the second angle sensor 2 to the axis of the third angle sensor 3; the target distance r1 is the vertical distance from the axis of the second angle sensor 2 to the X axis; L1, L2, L3 and r1 are generally constants according to design requirements; the first angle sensor 1 measures the first swing arm 4 and the second swing arm 5 The second angle sensor 2 measures the angle ω between the axis of the rotating shaft of the second angle sensor 2 and the Z axis; the third angle sensor 3 measures the angle θ between the second swing arm 5 and the X axis; the initial angle α0 of the first angle sensor 1 is the initial angle between the first swing arm 4 and the second swing arm 5, that is, the initial reading of the first angle sensor 1; the initial angle ω0 of the second angle sensor 2 is the initial angle between the axis of the rotating shaft of the second angle sensor 2 and the Z axis, that is, the initial reading of the second angle sensor 2; the initial angle θ0 of the third angle sensor 3 is the initial angle between the second swing arm 5 and the X axis, that is, the initial reading of the third angle sensor 3.

[0079] Here, the parameters α0, θ0, and ω0 are determined after the measuring device is installed on the dummy's chest ribs. Since the dummy's ribs may not fully return to their initial position after each impact, these values ​​cannot be reset after each test and should be based on actual data. L1, L2, L3, and r1 are the design values ​​of the measuring device. After assembly according to design requirements, these parameters are fixed. Substituting these parameters into the measuring device's calculation formula yields the initial position.

[0080] S102: Using a point where the center of the universal joint's rotation axis connects to a rib on the test dummy's chest as a measurement point, and determining initial coordinates of the measurement point when the test dummy's chest is not impacted based on the design parameters and initial angles of the first angle sensor, the second angle sensor, and the third angle sensor;

[0081] In this step, a displacement measurement mechanism composed of three angle sensors can equate one angle sensor (first angle sensor) and two swing arms on both sides of the sensor (first swing arm and second swing arm) to one displacement sensor, as shown in Figure 4, where r is the displacement of the equivalent displacement sensor. By reasoning based on one displacement sensor and two angle sensors (second angle sensor and third angle sensor), the three-dimensional displacement of the compressed chest can be obtained.

[0082] It should be noted that, referring to FIG. 2 , FIG. 2 is a flow chart of another method for measuring chest displacement of a test dummy provided in an embodiment of the present application. As shown in FIG. 2 , the steps of determining the initial coordinates of the measurement points on the test dummy's chest when it is not impacted based on the design parameters and the initial angles of the first angle sensor, the second angle sensor, and the third angle sensor include:

[0083] S201, substituting the first distance, the second distance, and the initial angles of the first angle sensor, the second angle sensor, and the third angle sensor into a first preset formula to obtain an initial horizontal axis coordinate;

[0084] In this step, the first preset formula is as follows:

[0085] Wherein, L1 is the first distance, L2 is the second distance, θ0 is the initial angle of the third angle sensor, ω0 is the initial angle of the second angle sensor, α0 is the initial angle of the first angle sensor, and x0 is the horizontal coordinate of the initial position point F (the initial horizontal axis coordinate of the measurement point).

[0086] S202, substituting the first distance, the second distance, the target distance, the initial angle of the first angle sensor, and the initial angle of the third angle sensor into a second preset formula to obtain an initial vertical axis coordinate;

[0087] In this step, the second preset formula is as follows:

[0088] Where r1 is the target distance, and y0 is the ordinate of the initial position point F (the initial ordinate coordinate of the measurement point).

[0089] S203, substituting the first distance, the second distance, the third distance, and the initial angles of the first angle sensor, the second angle sensor, and the third angle sensor into a third preset formula to obtain an initial vertical axis coordinate;

[0090] In this step, the third preset formula is as follows:

[0091] Wherein, z0 is the vertical coordinate of the initial position point F (the initial vertical axis coordinate of the measurement point).

[0092] S204 : Determine a combination of the initial horizontal axis coordinate, the initial vertical axis coordinate, and the initial vertical axis coordinate as the initial coordinate of the measurement point when the chest of the test dummy is not impacted.

[0093] In this step, the coordinates (x0, y0, z0) of the initial position point F, ie, the initial coordinates of the measurement point, can be obtained through steps S201 to S203.

[0094] S103, after the test dummy's chest is impacted, obtaining current angles of the first angle sensor, the second angle sensor, and the third angle sensor in the measuring device;

[0095] In this step, after the test dummy's chest is impacted, the sensor reading is re-read to determine the coordinates of point C (x C ,y C , z C ), which is the current coordinate of the measurement point.

[0096] S104, determining the current coordinates of the measurement point when the chest of the test dummy is impacted based on the current angles of the first angle sensor, the second angle sensor, and the third angle sensor;

[0097] It should be noted that the step of determining the current coordinates of the measurement point when the chest of the test dummy is impacted based on the current angles of the first angle sensor, the second angle sensor, and the third angle sensor includes:

[0098] S1041: Substitute the first distance, the second distance, and the current angles of the first angle sensor, the second angle sensor, and the third angle sensor into a fourth preset formula to obtain a current horizontal axis coordinate;

[0099] In this step, the fourth preset formula is as follows:

[0100] Where, (Δα(t)+α0) is the current angle of the first angle sensor, (Δθ(t)+θ0) is the current angle of the third angle sensor, (ω0+Δω(t)) is the current angle of the second angle sensor, and x C It is the horizontal coordinate of the current position point C (the current horizontal axis coordinate of the measurement point).

[0101] S1042: Substitute the first distance, the second distance, the target distance, the current angle of the first angle sensor, and the current angle of the third angle sensor into a fifth preset formula to obtain a current vertical axis coordinate;

[0102] In this step, the fifth preset formula is as follows:

[0103] Among them, y C It is the ordinate of the current position point C (the current ordinate coordinate of the measuring point).

[0104] S1043: Substitute the first distance, the second distance, the third distance, and the current angles of the first angle sensor, the second angle sensor, and the third angle sensor into a sixth preset formula to obtain a current vertical axis coordinate;

[0105] In this step, the sixth preset formula is as follows:

[0106] Among them, z C It is the vertical coordinate of the current position point C (the current vertical axis coordinate of the measuring point).

[0107] S1044: Determine a combination of the current horizontal axis coordinate, the current vertical axis coordinate, and the current vertical axis coordinate as the current coordinate of the measurement point when the chest of the test dummy is impacted.

[0108] In this step, the coordinates (x C ,y C , z C ), which is the current coordinate of the measurement point when the test dummy’s chest is impacted.

[0109] Here, it can be seen that the first preset formula is the formula when the measurement time parameters (Δr(t), Δθ(t), Δω(t)) in the fourth preset formula are zero; similarly, the second preset formula is the formula when the measurement time parameters in the fifth preset formula are zero; the third preset formula is the formula when the measurement time parameters in the sixth preset formula are zero.

[0110] It should be noted that the process of inferring the coordinates of point C and point F using one displacement sensor and two angle displacement sensors is as follows:

[0111] Please refer to Figures 6 and 7. Figure 6 is a schematic diagram of a spatial geometric principle provided in an embodiment of the present application. Figure 7 is a schematic diagram of a spatial geometric principle provided in an embodiment of the present application. As shown in Figure 6, the trigonometric function relationship can be used to calculate: 2 =OD 2 =AO 2 +AD 2 -2×AO×AD×cos(Δα(t)+α0);

[0112] Among them, AO=L1, AD=BC=L2, AB=CD=L3, it can be deduced that:

[0113] Where r is the displacement of the equivalent displacement sensor, which is equivalent to the vertical distance from the rotation center of the universal joint to the Y axis in Figure 4. As can be seen from Figure 6, the angle of rotation of the equivalent displacement sensor along the Z axis is: σ=Δθ(t)+θ0-∠DOA;

[0114] Here, we can know from the trigonometric function relationship:

[0115] therefore:

[0116] Therefore, the coordinate formula of the measuring device at point D in the coordinate system is: d (t)=r cos σ cos(Δω(t)+ω0); y d (t)=r sin σ+r1; z d (t)=r cos σ sin(Δω(t)+ω0);

[0117] As shown in Figure 6, based on the geometric relationship, the coordinates of point C can be determined. The specific formula is as follows: c =x d -L3sin(Δω(t)+ω0); x c =r cos σ cos(Δω(t)+ω0)-L3sin(Δω(t)+ω0); y c =y d =r sin σ+r1; z c =z d +L3cos(Δω(t)+ω0)

[0118] As shown in Figure 7, (x0, y0, z0) is the coordinate of point F in the coordinate system, which is the coordinate of the measurement point at the center of the rotation axis of the universal joint 7 at the front end of the first swing arm 4 of the measuring device in the coordinate system space, that is, the initial coordinate of the measurement point. The displacement increment from point F to point D in the X-axis direction in the coordinate system is Δx d (t), the displacement increment in the Y-axis direction is Δy d (t), the displacement increment in the Z-axis direction is Δz d(t). r is the equivalent length of point D relative to point O at any time t during the test process from point F to point D (in mm). The angle α can be converted into length through the above formula of r. Δθ(t) is the reading of the angular displacement sensor along the Y-axis in the measuring device at any time t during the test process (in degrees). Δω(t) is the reading of the angular displacement sensor along the Z-axis in the measuring device at any time t during the test period (in degrees). According to the determined coordinates of point D, the coordinates of point C can be obtained. When t=0, the coordinates of the initial position point F (x0, y0, z0) can be calculated according to the above formula for the coordinates of point C, that is: x0=r cos σ cos ω0-L3sin ω0; y0=r sin σ+r1; z0=r cos σ sin ω0+L3cos ω0;

[0119] Thus, the solution formulas for the initial coordinates of the measurement point and the current coordinates after impact can be obtained.

[0120] S105 : Obtaining a three-dimensional displacement of the compressed chest of the test dummy based on the initial coordinates of the measurement point and the current coordinates of the measurement point.

[0121] It should be noted that the steps of obtaining the three-dimensional displacement of the compressed chest of the test dummy based on the initial coordinates of the measurement points and the current coordinates of the measurement points include:

[0122] S1051. Determine the difference between the current horizontal axis coordinate in the current coordinates of the measuring point and the initial horizontal axis coordinate in the initial coordinates of the measuring point as the current horizontal displacement;

[0123] S1052: Determine the difference between the current longitudinal axis coordinate in the current coordinates of the measuring point and the initial longitudinal axis coordinate in the initial coordinates of the measuring point as the current longitudinal displacement;

[0124] S1053: Determine the difference between the current vertical axis coordinate in the current coordinates of the measuring point and the initial vertical axis coordinate in the initial coordinates of the measuring point as the current vertical displacement;

[0125] S1054: Determine a combination of the current lateral displacement, the current longitudinal displacement, and the current vertical displacement as a three-dimensional displacement of the compressed chest of the test dummy.

[0126] In steps S1051 to S1054, the compression displacement change of the measurement point on the chest surface of the test dummy before and after the impact can be determined, that is, the increment of each direction axis from point F to point C. The specific formula is as follows: Δx = x C -x0; Δy=yC -y0; Δz=z C -z0;

[0127] Where Δx is the current lateral displacement, Δy is the current vertical displacement, and Δz is the current vertical displacement. The three-dimensional displacement of the dummy's chest due to compression is (Δx, Δy, Δz). The incremental equations for each axis from the initial position coordinate F to point C can be used to determine the spatial displacement of the dummy's chest under force, providing an algorithmic basis for calibrating the software module. The initial position coordinates must be verified for each test.

[0128] It should be noted that the measurement method also includes:

[0129] 1. Obtaining the three-dimensional displacement of the upper left rib of the test dummy's chest when compressed, using a measuring device associated with a universal joint connected to the upper left rib of the test dummy;

[0130] 2. Obtaining, by means of a measuring device associated with a universal joint connected to the left lower rib of the test dummy, a three-dimensional displacement of the compressed left lower rib of the test dummy's chest;

[0131] 3. Obtaining, by means of a measuring device associated with a universal joint connected to the upper right rib of the test dummy, a three-dimensional displacement of the compressed upper right rib of the test dummy's chest;

[0132] 4. obtaining, by means of a measuring device belonging to a universal joint connected to the right lower rib of the test dummy, a three-dimensional displacement of the compressed right lower rib of the test dummy's chest;

[0133] 5. Determine an average displacement of the test dummy's chest compression based on the three-dimensional displacement of the left upper rib, the left lower rib, the right upper rib, and the right lower rib of the test dummy's chest compression;

[0134] 6. Determine whether the average displacement of the test dummy's chest when compressed is within a preset chest calibration displacement range;

[0135] 7. If yes, the bionic performance of the chest of the test dummy is determined to be up to standard.

[0136] In steps one to seven, a measuring device is generally installed on the upper left, upper right, lower left, and lower right of the spine inside the dummy's chest. This measurement method is used to measure the rib compression displacement at different positions after the chest is subjected to force, which is used to assess the risk of human injury.

[0137] As an example, the mounting bases of the four measuring devices are fixed on the dummy spine respectively, and the four universal joints are connected to the front end of the upper left, upper right, lower left and lower right ribs of the dummy respectively. The following example only selects one of the measuring devices for calculation to illustrate its measurement method; the intersection of the center of the rotating shaft of the third angle sensor and the outer end surface of the mounting base is used as the coordinate origin, and a coordinate system as shown in Figures 4 and 5 is established. According to the established coordinate system, several fixed parameters of the measuring device are L1=51mm, L2=69.5mm, L3=20mm, r1=10.5mm. After the measuring device is installed inside the dummy's chest cavity, the initial values ​​of the three angle sensors are read according to the data collector display and recorded: α0=-20.96°, θ0=56.17°, ω0=-111.52°; the above L1, L2, L3, r1, α0, θ0, ω0 are substituted into the formula (the first preset formula, the second preset formula, and the first preset formula). In the preset formula and the third preset formula), the initial coordinates (x0, y0, z0) of the measuring device when it is installed on the dummy's chest without being impacted are calculated respectively, namely (109.59, 0.56, 22.51); according to the dummy chest impact calibration requirements, the dummy chest is struck at a certain speed with an impact hammer. During the impact, the dummy ribs are compressed to produce compression displacement; according to the display of the data collector, the values ​​of the three angle sensors at the same time are read again and recorded: α1=α0+Δα(t)=-20.96°, θ1=θ0+Δθ(t)=56.17°, ω1=ω0+Δω(t)=-111.52°; the recorded values ​​of α1, θ1, ω1, L1, L2, L3, and r1 are substituted into the formulas (the fourth preset formula, the fifth preset formula, and the sixth preset formula) to calculate the coordinates (x0, y0, z0) of the front end of the ribs (measuring point) of the measuring device when the dummy's chest is impacted. C ,y C , z C ), namely (56.95, 8.60, 19.47); the three-dimensional displacement of the dummy chest compression displacement can be calculated by the following formula, namely: Δx=x C -x0=56.95-109.59=-52.64mm; Δy=y C -y0=8.60-0.56=8.04mm; Δz=z C -z0=19.47-22.51=-3.04mm;

[0138] Similarly, similar to the above method, the three-dimensional displacements of the dummy's upper left, upper right, lower left, and lower right ribs can be calculated respectively. By calculating the average of the three-dimensional displacements of the four ribs and comparing them with the range required for chest calibration, it is possible to examine whether the bionic performance of the dummy's chest meets the standards. The measurement method provided in this embodiment can effectively measure the three-dimensional displacement of the collision dummy's chest compression displacement, providing more accurate and reliable data reference for dummy calibration and dummy injury assessment.

[0139] In summary, the measurement method provided in this embodiment is applied to a measuring device, and the measuring device only involves three angle sensors (which can be angle sensors of the same type), which are convenient to implement and easy to obtain; using the trigonometric function relationship, the three angle changes are converted into spatial displacement changes, and the displacement component in each direction is given, and the compression displacement of the dummy chest is accurately calculated. In addition, the compression displacement changes of the ribs at different positions on the dummy chest can also be measured, which can more realistically reflect the biological response of the chest when it is impacted, corresponds to the passive safety occupant injury assessment index, and is more conducive to the safety assessment of personnel protection in manned vehicles.

[0140] The embodiment of the present application provides a method for measuring the chest displacement of a test dummy, which is applied to a measuring device for the chest displacement of a test dummy, wherein the measuring device is composed of a first angle sensor, a second angle sensor, a third angle sensor, a universal joint, a first swing arm and a second swing arm, wherein the third angle sensor, the second angle sensor, the second swing arm, the first angle sensor, the first swing arm and the universal joint are connected in sequence, and the front end of the universal joint is connected to the ribs of the chest of the test dummy; the measuring method comprises: obtaining the design parameters of the measuring device in a pre-established coordinate system, and the initial angles of the first angle sensor, the second angle sensor and the third angle sensor in the measuring device; and rotating the universal joint. A point at the center of the axis connected to the ribs of the test dummy's chest is used as a measurement point, and based on the design parameters and the initial angles of the first angle sensor, the second angle sensor, and the third angle sensor, the initial coordinates of the measurement point when the test dummy's chest is not impacted are determined; after the test dummy's chest is impacted, the current angles of the first angle sensor, the second angle sensor, and the third angle sensor in the measuring device are obtained; based on the current angles of the first angle sensor, the second angle sensor, and the third angle sensor, the current coordinates of the measurement point when the test dummy's chest is impacted are determined; and based on the initial coordinates of the measurement point and the current coordinates of the measurement point, the three-dimensional displacement of the test dummy's chest due to compression is obtained.

[0141] In this way, the technical solution provided by the present application can determine the compressive displacement components of the dummy's chest in three directions through a simple measuring device composed of three angle sensors to measure the compressive displacement changes of the dummy's chest ribs, more realistically reflecting the biological response of the chest when impacted, and improving the accuracy of measuring the deformation of the dummy's chest.

[0142] Based on the same application concept, the embodiments of the present application also provide a device for measuring the chest displacement of a test dummy corresponding to the above-mentioned method for measuring the chest displacement of a test dummy. Since the principle of solving the problem by the device in the embodiments of the present application is similar to the method in the above-mentioned embodiments of the present application, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0143] Please refer to Figures 8 and 9. Figure 8 is a structural diagram of a test dummy chest displacement measurement device provided in an embodiment of the present application, and Figure 9 is a structural diagram of a test dummy chest displacement measurement device provided in an embodiment of the present application. The device for measuring the chest displacement of a test dummy is composed of a first angle sensor, a second angle sensor, a third angle sensor, a universal joint, a first swing arm, and a second swing arm. The third angle sensor, the second angle sensor, the second swing arm, the first angle sensor, the first swing arm, and the universal joint are connected in sequence, and the front end of the universal joint is connected to the ribs of the test dummy's chest. As shown in Figure 8, the measuring device 810 includes:

[0144] A first acquisition module 811 is configured to acquire design parameters of the measuring device in a pre-established coordinate system, and initial angles of a first angle sensor, a second angle sensor, and a third angle sensor in the measuring device;

[0145] a first determining module 812 configured to use a point where the center of the universal joint's rotation axis connects to a rib on the test dummy's chest as a measurement point, and determine initial coordinates of the measurement point when the test dummy's chest is not impacted based on the design parameters and initial angles of the first angle sensor, the second angle sensor, and the third angle sensor;

[0146] A second acquisition module 813 is configured to acquire current angles of the first angle sensor, the second angle sensor, and the third angle sensor in the measuring device after the test dummy's chest is impacted;

[0147] A second determining module 814 is configured to determine the current coordinates of the measurement point when the chest of the test dummy is impacted based on the current angles of the first angle sensor, the second angle sensor, and the third angle sensor;

[0148] The measuring module 815 is configured to obtain the three-dimensional displacement of the chest of the test dummy when compressed based on the initial coordinates of the measuring point and the current coordinates of the measuring point.

[0149] Optionally, the design parameters include a first distance, a second distance, a third distance, and a target distance; the first distance is a perpendicular distance between the axis of the first angle sensor and the center of the rotating shaft of the universal joint; the second distance is a perpendicular distance between the axis of the first angle sensor and the axis of the second angle sensor; the third distance is a perpendicular distance between the axis of the second angle sensor and the axis of the third angle sensor; and the target distance is a perpendicular distance between the axis of the second angle sensor and the X-axis of the coordinate system; when the first determination module 812 is used to determine the initial coordinates of the measurement point when the chest of the test dummy is not impacted based on the design parameters and the initial angles of the first angle sensor, the second angle sensor, and the third angle sensor, the first determination module 812 is specifically used to:

[0150] Substituting the first distance, the second distance, and the initial angles of the first angle sensor, the second angle sensor, and the third angle sensor into a first preset formula to obtain an initial horizontal axis coordinate;

[0151] Substituting the first distance, the second distance, the target distance, the initial angle of the first angle sensor, and the initial angle of the third angle sensor into a second preset formula to obtain an initial vertical axis coordinate; wherein the first angle sensor measures the angle between the first swing arm and the second swing arm; the second angle sensor measures the angle between the axis of the second angle sensor's rotation shaft and the Z axis; and the third angle sensor measures the angle between the second swing arm and the X axis;

[0152] Substituting the first distance, the second distance, the third distance, and the initial angles of the first angle sensor, the second angle sensor, and the third angle sensor into a third preset formula to obtain an initial vertical axis coordinate;

[0153] A combination of the initial horizontal axis coordinate, the initial vertical axis coordinate, and the initial vertical axis coordinate is determined as the initial coordinate of the measurement point when the chest of the test dummy is not impacted.

[0154] Optionally, when the second determining module 814 is configured to determine the current coordinates of the measurement point when the chest of the test dummy is impacted based on the current angles of the first angle sensor, the second angle sensor, and the third angle sensor, the second determining module 814 is specifically configured to:

[0155] Substituting the first distance, the second distance, and the current angles of the first angle sensor, the second angle sensor, and the third angle sensor into a fourth preset formula to obtain a current horizontal axis coordinate;

[0156] Substituting the first distance, the second distance, the target distance, the current angle of the first angle sensor, and the current angle of the third angle sensor into a fifth preset formula to obtain a current vertical axis coordinate;

[0157] Substituting the first distance, the second distance, the third distance, and the current angles of the first angle sensor, the second angle sensor, and the third angle sensor into a sixth preset formula to obtain a current vertical axis coordinate;

[0158] A combination of the current horizontal axis coordinate, the current vertical axis coordinate, and the current vertical axis coordinate is determined as the current coordinate of the measurement point when the chest of the test dummy is impacted.

[0159] Optionally, the first preset formula is the formula when the measurement time parameter in the fourth preset formula is zero; the second preset formula is the formula when the measurement time parameter in the fifth preset formula is zero; and the third preset formula is the formula when the measurement time parameter in the sixth preset formula is zero.

[0160] Optionally, when the measuring module 815 is used to obtain the three-dimensional displacement of the compressed chest of the test dummy based on the initial coordinates of the measuring point and the current coordinates of the measuring point, the measuring module 815 is specifically used to:

[0161] determining a difference between a current horizontal axis coordinate in the current coordinates of the measuring point and an initial horizontal axis coordinate in the initial coordinates of the measuring point as a current horizontal displacement;

[0162] determining a difference between a current longitudinal axis coordinate in the current coordinates of the measuring point and an initial longitudinal axis coordinate in the initial coordinates of the measuring point as a current longitudinal displacement;

[0163] determining a difference between a current vertical axis coordinate in the current coordinates of the measuring point and an initial vertical axis coordinate in the initial coordinates of the measuring point as a current vertical displacement;

[0164] A combination of the current lateral displacement, the current longitudinal displacement, and the current vertical displacement is determined as a three-dimensional displacement of the compressed chest of the test dummy.

[0165] Optionally, as shown in FIG9 , the measuring device 810 further includes an application module 816 , and the application module 816 is configured to:

[0166] Obtaining a three-dimensional displacement of the compressed left upper rib of the test dummy's chest by a measuring device belonging to a universal joint connected to the left upper rib of the test dummy;

[0167] Obtaining a three-dimensional displacement of the compressed left lower rib of the test dummy's chest by a measuring device belonging to a universal joint connected to the left lower rib of the test dummy;

[0168] Obtaining a three-dimensional displacement of the compressed right upper rib of the test dummy's chest by a measuring device belonging to a universal joint connected to the right upper rib of the test dummy;

[0169] Obtaining a three-dimensional displacement of the right lower rib of the test dummy's chest when compressed by a universal joint connected to the right lower rib of the test dummy using a measuring device belonging to the universal joint connected to the right lower rib of the test dummy;

[0170] Determining an average displacement of the chest compression of the test dummy by the three-dimensional displacement of the compressed left upper rib, the three-dimensional displacement of the compressed left lower rib, the three-dimensional displacement of the compressed right upper rib, and the three-dimensional displacement of the compressed right lower rib of the chest of the test dummy;

[0171] Determining whether the average displacement of the chest of the test dummy when compressed is within a preset chest calibration displacement range;

[0172] If so, the bionic performance of the chest of the test dummy is determined to be up to standard.

[0173] An embodiment of the present application provides a device for measuring the chest displacement of a test dummy, which is applied to a device for measuring the chest displacement of a test dummy. The device is composed of a first angle sensor, a second angle sensor, a third angle sensor, a universal joint, a first swing arm, and a second swing arm. The third angle sensor, the second angle sensor, the second swing arm, the first angle sensor, the first swing arm, and the universal joint are connected in sequence, and the front end of the universal joint is connected to the ribs of the chest of the test dummy. The measuring device includes: a first acquisition module for acquiring design parameters of the measuring device in a pre-established coordinate system, and initial angles of the first angle sensor, the second angle sensor, and the third angle sensor in the measuring device; a first determination module for determining the position of the center of the rotation axis of the universal joint; A point connected to the ribs of the test dummy's chest is used as a measuring point, and based on the design parameters and the initial angles of the first angle sensor, the second angle sensor, and the third angle sensor, the initial coordinates of the measuring point when the test dummy's chest is not impacted are determined; a second acquisition module is used to obtain the current angles of the first angle sensor, the second angle sensor, and the third angle sensor in the measuring device after the test dummy's chest is impacted; a second determination module is used to determine the current coordinates of the measuring point when the test dummy's chest is impacted based on the current angles of the first angle sensor, the second angle sensor, and the third angle sensor; a measuring module is used to obtain the three-dimensional displacement of the compressed test dummy's chest based on the initial coordinates of the measuring point and the current coordinates of the measuring point.

[0174] In this way, the technical solution provided by the present application can determine the compressive displacement components of the dummy's chest in three directions through a simple measuring device composed of three angle sensors to measure the compressive displacement changes of the dummy's chest ribs, more realistically reflecting the biological response of the chest when impacted, and improving the accuracy of measuring the deformation of the dummy's chest.

[0175] Please refer to Figure 10 , which is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. As shown in Figure 10 , the electronic device 1000 includes a processor 1010 , a memory 1020 , and a bus 1030 .

[0176] The memory 1020 stores machine-readable instructions executable by the processor 1010. When the electronic device 1000 is running, the processor 1010 communicates with the memory 1020 via the bus 1030. When the machine-readable instructions are executed by the processor 1010, the steps of the method for measuring the chest displacement of the test dummy in the method embodiment shown in Figures 1 and 2 above can be performed. The specific implementation method can be found in the method embodiment and will not be repeated here.

[0177] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the computer program can execute the steps of the method for measuring the chest displacement of a test dummy in the method embodiments shown in FIG. 1 and FIG. 2 . The specific implementation method can be found in the method embodiments and will not be described in detail here.

[0178] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0179] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. There may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed may be through some communication interface, indirect coupling or communication connection of devices or units, which may be electrical, mechanical or other forms.

[0180] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0181] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0182] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0183] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-mentioned embodiments within the technical scope disclosed in the present application, or perform equivalent replacements for some of the technical features thereof. These modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A method for measuring chest displacement of a test dummy, characterized in that: A measuring device for chest displacement of a test dummy, the measuring device comprising a first angle sensor, a second angle sensor, a third angle sensor, a universal joint, a first swing arm and a second swing arm, the third angle sensor, the second angle sensor, the second swing arm, the first angle sensor, the first swing arm and the universal joint are connected in sequence, and the front end of the universal joint is connected to the ribs of the chest of the test dummy; the measuring method comprises: Acquire design parameters of the measuring device in a pre-established coordinate system, and initial angles of a first angle sensor, a second angle sensor, and a third angle sensor in the measuring device; The point where the center of the rotation axis of the universal joint is connected to the ribs of the chest of the test dummy is used as a measuring point, and based on the design parameters and the initial angles of the first angle sensor, the second angle sensor, and the third angle sensor, the initial coordinates of the measuring point when the chest of the test dummy is not impacted are determined; After the chest of the test dummy is impacted, obtaining current angles of the first angle sensor, the second angle sensor, and the third angle sensor in the measuring device; Determining the current coordinates of the measurement point when the chest of the test dummy is impacted based on the current angles of the first angle sensor, the second angle sensor, and the third angle sensor; Based on the initial coordinates of the measuring points and the current coordinates of the measuring points, the three-dimensional displacement of the compressed chest of the test dummy is obtained.

2. The measuring method according to claim 1, characterized in that: The design parameters include a first distance, a second distance, a third distance and a target distance; the first distance is a vertical distance from the axis of the first angle sensor to the center of the rotating shaft of the universal joint; the second distance is a vertical distance from the axis of the first angle sensor to the axis of the second angle sensor; the third distance is a vertical distance from the axis of the second angle sensor to the axis of the third angle sensor; the target distance is a vertical distance from the axis of the second angle sensor to the X-axis of the coordinate system; the step of determining the initial coordinates of the measuring point when the chest of the test dummy is not impacted based on the design parameters and the initial angles of the first angle sensor, the second angle sensor and the third angle sensor, comprises: Substituting the first distance, the second distance, and the initial angles of the first angle sensor, the second angle sensor, and the third angle sensor into a first preset formula to obtain an initial horizontal axis coordinate; Substituting the first distance, the second distance, the target distance, the initial angle of the first angle sensor and the initial angle of the third angle sensor into a second preset formula to obtain an initial longitudinal axis coordinate; wherein the first angle sensor measures the angle between the first swing arm and the second swing arm; the second angle sensor measures the angle between the axis of the rotating shaft of the second angle sensor and the Z axis; and the third angle sensor measures the angle between the second swing arm and the X axis; Substituting the first distance, the second distance, the third distance and the initial angles of the first angle sensor, the second angle sensor and the third angle sensor into a third preset formula to obtain an initial vertical axis coordinate; A combination of the initial horizontal axis coordinate, the initial vertical axis coordinate and the initial vertical axis coordinate is determined as the initial coordinate of the measurement point when the chest of the test dummy is not impacted.

3. The measuring method according to claim 2, characterized in that: The step of determining the current coordinates of the measuring point when the chest of the test dummy is impacted based on the current angles of the first angle sensor, the second angle sensor, and the third angle sensor comprises: Substituting the first distance, the second distance, and the current angles of the first angle sensor, the second angle sensor, and the third angle sensor into a fourth preset formula to obtain a current horizontal axis coordinate; Substituting the first distance, the second distance, the target distance, the current angle of the first angle sensor, and the current angle of the third angle sensor into a fifth preset formula to obtain a current vertical axis coordinate; Substituting the first distance, the second distance, the third distance and the current angles of the first angle sensor, the second angle sensor and the third angle sensor into a sixth preset formula to obtain a current vertical axis coordinate; A combination of the current horizontal axis coordinate, the current vertical axis coordinate and the current vertical axis coordinate is determined as the current coordinate of the measurement point when the chest of the test dummy is impacted.

4. The measuring method according to claim 3, characterized in that: The first preset formula is the formula when the measurement time parameter in the fourth preset formula is zero; the second preset formula is the formula when the measurement time parameter in the fifth preset formula is zero; The third preset formula is a formula when the measurement time parameter in the sixth preset formula is zero.

5. The measuring method according to claim 1, characterized in that: The step of obtaining the three-dimensional displacement of the compressed chest of the test dummy based on the initial coordinates of the measuring points and the current coordinates of the measuring points comprises: Determine the difference between the current horizontal axis coordinate in the current coordinates of the measuring point and the initial horizontal axis coordinate in the initial coordinates of the measuring point as the current horizontal displacement; Determine the difference between the current longitudinal axis coordinate in the current coordinate of the measuring point and the initial longitudinal axis coordinate in the initial coordinate of the measuring point as the current longitudinal displacement; Determine the difference between the current vertical axis coordinate in the current coordinates of the measuring point and the initial vertical axis coordinate in the initial coordinates of the measuring point as the current vertical displacement; A combination of the current lateral displacement, the current longitudinal displacement and the current vertical displacement is determined as a three-dimensional displacement of the compressed chest of the test dummy.

6. The measuring method according to claim 1, characterized in that: The measuring method further comprises: Obtaining a three-dimensional displacement of the compressed left upper rib of the chest of the test dummy by means of a measuring device belonging to a universal joint connected to the left upper rib of the test dummy; Obtaining a three-dimensional displacement of the compressed left lower rib of the chest of the test dummy by means of a measuring device belonging to a universal joint connected to the left lower rib of the test dummy; Obtaining a three-dimensional displacement of the compressed right upper rib of the chest of the test dummy by means of a measuring device belonging to a universal joint connected to the right upper rib of the test dummy; Obtaining a three-dimensional displacement of the right lower rib of the chest of the test dummy when compressed by a measuring device belonging to a universal joint connected to the right lower rib of the test dummy; Determine the average displacement of the chest compression of the test dummy through the three-dimensional displacement of the compressed left upper rib, the three-dimensional displacement of the compressed left lower rib, the three-dimensional displacement of the compressed right upper rib and the three-dimensional displacement of the compressed right lower rib of the chest of the test dummy; Determining whether the average displacement of the chest of the test dummy when compressed is within a preset chest reference displacement range; If so, the bionic performance of the chest of the test dummy is determined to be up to standard.

7. A device for measuring chest displacement of a test dummy, characterized in that: A measuring device for chest displacement of a test dummy, the measuring device comprising a first angle sensor, a second angle sensor, a third angle sensor, a universal joint, a first swing arm and a second swing arm, the third angle sensor, the second angle sensor, the second swing arm, the first angle sensor, the first swing arm and the universal joint are connected in sequence, and the front end of the universal joint is connected to the ribs of the chest of the test dummy; the measuring device comprises: A first acquisition module, used to acquire design parameters of the measuring device in a pre-established coordinate system, and initial angles of a first angle sensor, a second angle sensor, and a third angle sensor in the measuring device; a first determination module, configured to use a point where the center of the rotation axis of the universal joint is connected to the ribs of the chest of the test dummy as a measurement point, and determine the initial coordinates of the measurement point when the chest of the test dummy is not impacted based on the design parameters and the initial angles of the first angle sensor, the second angle sensor, and the third angle sensor; A second acquisition module is used to acquire the current angles of the first angle sensor, the second angle sensor and the third angle sensor in the measuring device after the chest of the test dummy is impacted; A second determination module is used to determine the current coordinates of the measurement point when the chest of the test dummy is impacted based on the current angles of the first angle sensor, the second angle sensor and the third angle sensor; The measuring module is used to obtain the three-dimensional displacement of the compressed chest of the test dummy based on the initial coordinates of the measuring point and the current coordinates of the measuring point.

8. The measuring device according to claim 7, characterized in that The design parameters include a first distance, a second distance, a third distance and a target distance; the first distance is a vertical distance from the axis of the first angle sensor to the center of the rotating shaft of the universal joint; the second distance is a vertical distance from the axis of the first angle sensor to the axis of the second angle sensor; the third distance is a vertical distance from the axis of the second angle sensor to the axis of the third angle sensor; the target distance is a vertical distance from the axis of the second angle sensor to the X-axis of the coordinate system; when the first determination module is used to determine the initial coordinates of the measurement point when the chest of the test dummy is not impacted based on the design parameters and the initial angles of the first angle sensor, the second angle sensor and the third angle sensor, the first determination module is specifically used to: Substituting the first distance, the second distance, and the initial angles of the first angle sensor, the second angle sensor, and the third angle sensor into a first preset formula to obtain an initial horizontal axis coordinate; Substituting the first distance, the second distance, the target distance, the initial angle of the first angle sensor and the initial angle of the third angle sensor into a second preset formula to obtain an initial longitudinal axis coordinate; wherein the first angle sensor measures the angle between the first swing arm and the second swing arm; the second angle sensor measures the angle between the axis of the rotating shaft of the second angle sensor and the Z axis; and the third angle sensor measures the angle between the second swing arm and the X axis; Substituting the first distance, the second distance, the third distance and the initial angles of the first angle sensor, the second angle sensor and the third angle sensor into a third preset formula to obtain an initial vertical axis coordinate; A combination of the initial horizontal axis coordinate, the initial vertical axis coordinate and the initial vertical axis coordinate is determined as the initial coordinate of the measurement point when the chest of the test dummy is not impacted.

9. An electronic device, characterized in that: include: A processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate through the bus, and when the machine-readable instructions are run by the processor, the steps of the method for measuring the chest displacement of a test dummy as described in any one of claims 1 to 6 are executed.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for measuring the chest displacement of a test dummy according to any one of claims 1 to 6 are executed.

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