Method for calibrating performance of WorldSID 50th dummy arm

Abstract

The invention relates to the technical field of vehicle safety tests, in particular to a WorldSID 50th dummy arm performance calibration method, which comprises calibration of a working condition that an arm rotates along a Y axis and calibration of a working condition that the arm bends along an X axis. Adopted dummy swing arm calibration equipment mainly comprises a swing arm, a swing arm releasing and lifting mechanism, a honeycomb aluminum barrier, a speed measuring device and a swing arm acceleration sensor. In the process, the dummy arm is connected with the tail end of the swing arm, and the swing arm is released after being lifted to a certain angle. After release, the swing arm collides with the honeycomb aluminum, and the dummy arm rotates or bends forwards. A force sensor is installed at the upper end of a dummy arm to measure the stress condition of the arm, an angular velocity sensor is installed on the inner side or the lower end of the arm, and an arm bending angle curve is obtained after integration and used for dynamic motion analysis of the arm. According to the calibration method, the arm performance can be well evaluated, the test consistency is good, the operation is simple, and the motion form of the arm in the whole vehicle test is well reproduced.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle safety testing, and in particular to a method for calibrating the arm performance of a WorldSID 50th dummy. Background Art

[0002] The side impact test is an important test item in the vehicle safety evaluation procedure, which aims to examine the passive protection ability of the vehicle for the occupants. The WorldSID 50th dummy is a key test equipment for the side impact test. It has a high degree of biosimulation and simulates the structural characteristics of the human body well. The WorldSID 50th male dummy arm is designed based on the ISO 15830 standard. The main material is elastic rubber, which simulates the human arm muscles. The inside of the rubber is a plastic bone. The arm is connected to the shoulder ribs through aluminum metal connectors and connecting bolts.

[0003] In the side impact test, interior parts such as door panels are in direct contact with the dummy's arms, shoulder ribs and other parts. Referring to the definition of the dummy coordinate system in the SAE J211 standard (American Society of Automotive Engineering standard), the dummy's arms will rotate forward (rotate along the Y axis) and bend inward (bend along the X axis). At the same time, the seat side airbag will directly contact the dummy's arms after deployment. The arms are the key force-bearing parts between the dummy's chest and the airbag and door panels. During the collision, they are closely related to the airbag deployment shape, the dummy's chest and shoulder injuries. The tightness of the dummy's arm joints is closely related to the height of the arm lift. In each test standard, the adjustment of the arm joints is defined as a 1-2g state, but the detailed method of joint adjustment and the degree of joint tightening are not defined. Therefore, the tightness of the joint will have a great impact on the lifting of the dummy's arm in the test. The polyurethane rubber, which is the main material of the arm, is affected by external conditions such as oxygen during use and storage, and its biomechanical properties are prone to changes. In addition, the energy of the collision test is huge, and the arm is subjected to impact for a long time, and the arm skin is prone to cracking, which in turn affects the accuracy of the dummy's chest rib displacement and shoulder force measurement in the collision test.

[0004] After multiple tests, the mechanical properties of the dummy arm need to be tested to ensure the repeatability and reproducibility of the arm's performance and avoid test deviations caused by changes in arm performance. The calibration test of the dummy can effectively verify the dummy's biosimulation. At present, the calibration parts of the WorldSID 50th dummy are mainly concentrated on the head, neck, shoulders, chest, abdomen, and pelvis, and there are relatively few studies on the mechanical characteristics of the arm. A static calibration test scheme has been proposed in the industry. Although the mechanical performance characteristic curve of the arm can be obtained, the arm moves dynamically during the collision test. Static calibration cannot simulate the dynamic impact characteristics of the arm, and the calibration results cannot accurately evaluate the performance of the dummy arm itself.

[0005] In view of the above problems, the inventors of the present invention finally obtained the present invention after a long period of research and practice. Summary of the invention

[0006] In order to solve at least one aspect of the above technical problems, the present invention provides a calibration method for the arm performance of the WorldSID 50th dummy, which is convenient, efficient and low-cost, can better evaluate the arm performance, has good test consistency, is simple to operate, and better reproduces the movement form of the arm in the whole vehicle test.

[0007] The technical solution adopted by the present invention is:

[0008] Provided is a calibration method for the performance of a WorldSID 50th dummy arm, the implementation of which is based on a dummy swing arm calibration device, the device comprising a swing arm and an impact area, an acceleration sensor is installed at the end of the swing arm, and a speed measuring device and a honeycomb aluminum barrier are installed in the swing arm impact area;

[0009] The calibration method includes: a calibration method for a dummy arm rotating along the Y-axis, specifically including the following steps:

[0010] S101: Assemble the dummy arm, the sensor bracket, the shoulder force sensor and the shoulder bracket to form a dummy arm assembly, and install a rotation angular velocity sensor on the inner side of the skin of the dummy arm;

[0011] S102: Install the arm assembly on the adapter module, and install the adapter module at the end of the swing arm, so that the arm assembly is located on the side of the swing arm impact surface;

[0012] S103: Adjust the dummy arm joint to 1-2g state;

[0013] S104: connecting the shoulder force sensor, the rotation angular velocity sensor, the acceleration sensor and the speed measuring device to the static data collector;

[0014] S105: The swing arm is raised to 40° with the vertical and then released. The swing arm swings downward and hits the honeycomb aluminum barrier. The dummy arm rotates along the Y axis.

[0015] S106: collecting test data, generating swing arm impact velocity and calibration result curves, the calibration result curves including: swing arm acceleration curve, shoulder force curve, arm rotation angle curve along Y axis;

[0016] S107: Evaluate the calibration results.

[0017] Furthermore, the calibration method also includes: a calibration method for a dummy arm bending condition along the X-axis, specifically including the following steps:

[0018] S201: Assemble the dummy arm, the sensor bracket, the shoulder force sensor and the shoulder bracket to form a dummy arm assembly, and install a bending angular velocity sensor at the lower end of the dummy arm;

[0019] S202: Install the arm assembly and the shoulder rib bracket on the adapter module, and install the adapter module at the end of the swing arm, with the arm assembly located on the opposite side of the swing arm impact surface;

[0020] S203: Adjust the dummy arm joint to 1-2g state;

[0021] S204: connecting the shoulder force sensor, the bending angular velocity sensor, the acceleration sensor and the speed measuring device to the static data collector;

[0022] S205: The swing arm is raised to 60° with the vertical and then released. The swing arm swings downward and hits the honeycomb aluminum barrier. The dummy arm bends along the X-axis.

[0023] S206: collecting test data, generating arm swing impact velocity and calibration result curves, the calibration result curves including: arm swing acceleration curve, shoulder force curve, arm bending angle curve along X axis;

[0024] S207: Evaluate the calibration results.

[0025] Furthermore, before assembling the dummy arm assembly, the dummy arm is placed in an environment with a temperature range of 20.6°C to 22.2°C and a temperature range of 10% to 70% for at least 4 hours.

[0026] Furthermore, the dummy arm joint is adjusted to a 1-2g state, and the specific adjustment method is as follows:

[0027] The dummy arm corresponds to the first locking pin position downward from the uppermost positioning point of the sensor bracket. The dynamometer pulling point is located along the dummy arm and 20 cm away from the center of the arm joint adjustment bolt. The pulling direction of the dynamometer is at a 90-degree angle to the dummy arm. The dynamometer is used to measure the force value at which the arm can start to move upward, and the force value is adjusted to within the range of 20±2.5N.

[0028] Furthermore, in step S107, the evaluation criteria for the calibration result are: if the measured values ​​are all within the allowable range, the calibration is passed, otherwise it is not passed; specifically:

[0029] The permissible range of the impact velocity measured by the velocity measuring device is 2.87-2.93 m / s;

[0030] The permissible range of the swing arm acceleration measured by the acceleration sensor is 21.2 to 24.3 g;

[0031] The allowable range of the shoulder force X-direction component measured by the shoulder force sensor is 201-252 N, and the allowable range of the shoulder force Z-direction component is 149-171 N;

[0032] The allowable range of the arm rotation angle along the Y-axis measured by the rotation angular velocity sensor is 34.6~40.4°.

[0033] Furthermore, in step S207, the evaluation criteria for the calibration result are: if the measured values ​​are all within the allowable range, the calibration is passed, otherwise it is not passed; specifically:

[0034] The permissible range of the impact velocity measured by the velocity measuring device is 4.23-4.31 m / s;

[0035] The permissible range of the swing arm acceleration measured by the acceleration sensor is 21.0~22.8g;

[0036] The allowable range of the shoulder force X-direction component measured by the shoulder force sensor is 115~145 N, the allowable range of the shoulder force Y-direction component is 448~480 N, and the allowable range of the shoulder force Z-direction component is 239~272 N;

[0037] The allowable range of the arm bending angle along the X-axis measured by the bending angular velocity sensor is 31.9~34.2°.

[0038] Further, in step S201, the bending angular velocity sensor is installed 3 cm upward from the lowest end of the dummy's arm.

[0039] Furthermore, the dummy arm is connected to the shoulder force sensor via the sensor bracket, the shoulder force sensor is connected to the shoulder bracket, and the shoulder bracket is connected to the adapter module.

[0040] Compared with the prior art, the beneficial effects of the present invention are:

[0041] The calibration method of the dummy arm performance in the present invention simulates two kinds of arm motion forms in the vehicle test, designs two calibration conditions: arm bending along the X-axis and arm rotating along the Y-axis, which can better simulate the arm motion forms in the collision test, more accurately evaluate the dynamic motion performance of the dummy arm, and the test operation is simple, repeatable, low cost and high efficiency. At the same time, a quantitative adjustment method for the 1~2g adjustment requirements of the dummy arm joint before the test is proposed, and the damage limit range of whether the arm performance passes is given. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 A schematic diagram showing the installation position of an angular velocity sensor according to an embodiment of the present invention is shown;

[0044] Figure 2 A schematic diagram showing the tension measurement of the dummy arm joint adjustment according to an embodiment of the present invention is shown;

[0045] Figure 3 A schematic diagram of the installation of equipment for calibrating the dummy arm rotating along the Y-axis according to an embodiment of the present invention is shown;

[0046] Figure 4 A schematic diagram showing the installation of equipment for calibrating the bending condition of a dummy arm along the X-axis according to an embodiment of the present invention is shown;

[0047] Figure 5 A schematic diagram of the three-dimensional structure of a switching module according to an embodiment of the present invention is shown;

[0048] Figure 6 A schematic diagram of the front end of a switching module according to an embodiment of the present invention is shown;

[0049] Figure 7 A schematic diagram of the left end surface of the adapter module according to the embodiment of the present invention is shown. DETAILED DESCRIPTION

[0050] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0051] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] The definition of the coordinate system in the present invention refers to the definition of the dummy coordinate system in the SAE J211 standard. A calibration method for the arm performance of a WorldSID 50th dummy is provided, including calibration of the arm rotation condition along the Y axis and calibration of the arm bending condition along the X axis.

[0054] 1. Calibration of arm rotation along Y axis, reference Figures 1 to 3 :

[0055] Disassembly of the dummy arm: Remove the dummy arm 1, sensor bracket, shoulder force sensor and shoulder bracket from the dummy body, and place the dummy arm in an environment with a temperature range of 20.6℃~22.2℃ and a humidity range of 10%~70% for at least 4 hours.

[0056] Assemble the arm assembly: Assemble the dummy arm 1, the sensor bracket (not shown in the figure), the shoulder force sensor 4 and the shoulder bracket (not shown in the figure) to form an arm assembly. The assembly connection structure of the arm assembly is consistent with the dummy body structure, that is, the dummy arm is connected to the sensor bracket, the sensor bracket is connected to the shoulder force sensor, and the shoulder force sensor is connected to the shoulder bracket. Install the rotation angular velocity sensor 2 on the inner side of the arm skin.

[0057] Adapter module installation: Then connect the arm assembly to the adapter module 5 dedicated to calibration, such as Figures 5 to 7 As shown, the adapter module 5 is an integrated design, and the material is high-strength 42crMo4, which can achieve matching connection of the arm assembly under two calibration conditions, and is easy to disassemble and simple to operate.

[0058] Equipment conditions: prepare a dummy swing arm calibration device, install an acceleration sensor 9 at the end of the swing arm 6, install a speed measuring device 8 and a honeycomb aluminum barrier 7 in the swing arm impact area, the size of the honeycomb aluminum barrier is 6 inches, and the number of honeycomb aluminum grids is 22.

[0059] The arm assembly is connected to the swing arm: the arm assembly together with the adapter module is matched and connected to the end of the swing arm 6 of the calibration equipment, and the arm assembly is located on the side of the swing arm impact surface.

[0060] Arm joint adjustment: Use the following method to adjust the dummy's arm joints to 1-2g. Figure 2 As shown, the dummy arm 1 corresponds to the first locking pin position downward from the uppermost positioning point of the sensor bracket, the pulling point of the dynamometer 10 is located downward along the dummy arm and 20 cm away from the center of the arm joint adjustment bolt 11, and the pulling direction of the dynamometer forms a 90-degree angle with the dummy arm. The dynamometer is used to measure the force value at which the arm can start to move upward, and the force value is adjusted to the range of 20±2.5N.

[0061] Sensors are connected to the data recorder: the shoulder force sensor 4, the rotational angular velocity sensor 2, and the acceleration sensor 9 are connected to the idle hub interface of the swing arm, and then the hub output connector and the speed measuring device 8 connector are connected to the static data collector.

[0062] Arm impact: After the swing arm is lifted to 40° with the vertical, it is released. The swing arm 6 swings downward and hits the honeycomb aluminum barrier 7. The dummy arm 1 rotates along the Y axis to collect test data.

[0063] Calibration result curve: Process the data in the data format of ISO13499 standard, the arm swing acceleration, shoulder force and arm rotation angle curve, and integrate the arm rotation angular velocity curve to obtain the arm rotation angle curve.

[0064] Evaluation of arm calibration results: The allowable ranges of the acceleration sensor, speed measuring device, shoulder force sensor, and arm rotation angle measurement channel are as follows. If the curves are all within the allowable range, the calibration passes; if any one of them exceeds the range, the calibration fails.

[0065]

[0066] 2. Calibration of arm bending along X-axis, reference Figure 1 , 2 , 4:

[0067] The calibration steps for arm bending along the X-axis are basically the same as those for arm rotation along the Y-axis. The differences are:

[0068] 1. The angular velocity sensor is installed at a different position. The bending angular velocity sensor is installed at the lower end of the dummy arm. Preferably, the bending angular velocity sensor is installed 3 cm upward from the lowest end of the dummy arm.

[0069] 2. The swing arm has different lifting heights, and the X-axis bending is calibrated to 60°.

[0070] 3. The evaluation of arm calibration results is different, and the measurement value and interval range requirements are shown in the following table:

[0071]

[0072] The dummy swing arm calibration equipment mainly includes a swing arm, a swing arm release and lifting mechanism, a honeycomb aluminum barrier, a speed measuring device and a pendulum acceleration sensor. Based on this equipment, a transfer module is designed and manufactured for matching the dummy arm with the swing arm.

[0073] During the test, the dummy arm is connected to the end of the swing arm, and the swing arm is released after being raised to a certain angle. After being released, the swing arm collides with the honeycomb aluminum, and the dummy arm rotates or bends forward. A force sensor is installed at the upper end of the arm to measure the force on the arm, and an angular velocity sensor is installed on the inner side or lower end of the arm. After integration, the arm bending angle curve is obtained for dynamic motion analysis of the arm.

[0074] Regarding the determination of the damage curve limit in the test result evaluation: 4 dummy arms with different hardness were selected, and each arm was tested 10 times in each test condition, with a total of 40 tests in each condition. Then the coefficient of variation algorithm was used to evaluate the repeatability of the test. The calculation formula for the coefficient of variation is:

[0075] Coefficient of variation (CV) = (standard deviation (SD) / mean (Mean)) × 100%

[0076] The calculated results are shown in the following table. In the arm rotation test along the Y-axis, the swing arm acceleration, shoulder force Fz and rotation angle variation coefficient values ​​are all less than 5% (0-5% is excellent), and the shoulder force Fx is 5.6% (5-8% is good). In the arm bending test along the X-axis, the pendulum acceleration, shoulder force Fy, Fz and rotation angle variation coefficient values ​​are all less than 5% (0-5% is excellent), and the shoulder force Fx is 5.7% (5-8% is good). This indicates that the test repeatability is good, the test data is highly credible, and can be used as the data basis for defining the damage limit interval.

[0077] The damage limit interval is defined as: measurement mean ± 2 times standard deviation / Mean ± 2 * SD (95% confidence interval of normal distribution).

[0078]

[0079]

[0080] The above are only preferred embodiments of the present invention, which are only illustrative and not restrictive. The structures and connection modes of the components in the present invention can be changed, and any equivalent transformations and improvements based on the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A method for calibrating the performance of a WorldSID 50th dummy arm, characterized in that: The calibration method is implemented based on a dummy swing arm calibration device, which includes a swing arm and an impact area, an acceleration sensor is installed at the end of the swing arm, and a speed measuring device and a honeycomb aluminum barrier are installed in the swing arm impact area; The calibration method includes: a calibration method for a dummy arm rotating along the Y-axis, specifically including the following steps: S101: Assemble the dummy arm, the sensor bracket, the shoulder force sensor and the shoulder bracket to form a dummy arm assembly, and install a rotation angular velocity sensor on the inner side of the skin of the dummy arm; S102: Install the arm assembly on the adapter module, and install the adapter module at the end of the swing arm, so that the arm assembly is located on the side of the swing arm impact surface; S103: Adjust the dummy arm joint to 1~2g state; S104: connecting the shoulder force sensor, the rotation angular velocity sensor, the acceleration sensor and the speed measuring device to the static data collector; S105: The swing arm is raised to 40° with the vertical and then released. The swing arm swings downward and hits the honeycomb aluminum barrier. The dummy arm rotates along the Y axis. S106: collecting test data, generating swing arm impact velocity and calibration result curves, the calibration result curves including: swing arm acceleration curve, shoulder force curve, arm rotation angle curve along Y axis; S107: Evaluate the calibration results.

2. A method for calibrating the performance of a WorldSID 50th dummy arm as claimed in claim 1, characterized in that: The calibration method also includes: a calibration method for a dummy arm bending condition along the X-axis, specifically including the following steps: S201: Assemble the dummy arm, the sensor bracket, the shoulder force sensor and the shoulder bracket to form a dummy arm assembly, and install a bending angular velocity sensor at the lower end of the dummy arm; S202: Install the arm assembly and the shoulder rib bracket on the adapter module, and install the adapter module at the end of the swing arm, with the arm assembly located on the opposite side of the swing arm impact surface; S203: Adjust the dummy arm joint to a 1~2g state; S204: connecting the shoulder force sensor, the bending angular velocity sensor, the acceleration sensor and the speed measuring device to the static data collector; S205: The swing arm is raised to 60° with the vertical and then released. The swing arm swings downward and hits the honeycomb aluminum barrier. The dummy arm bends along the X-axis. S206: collecting test data, generating arm swing impact velocity and calibration result curves, the calibration result curves including: arm swing acceleration curve, shoulder force curve, arm bending angle curve along X axis; S207: Evaluate the calibration results.

3. A method for calibrating the performance of a WorldSID 50th dummy arm as claimed in claim 1 or 2, characterized in that: Before assembling the dummy arm assembly, place the dummy arm in an environment with a temperature range of 20.6℃~22.2℃ and a humidity range of 10%~70% for at least 4 hours.

4. A method for calibrating the performance of a WorldSID 50th dummy arm as claimed in claim 1 or 2, characterized in that: The specific adjustment method of adjusting the dummy arm joint to the 1-2g state is as follows: The dummy arm corresponds to the first locking pin position downward from the uppermost positioning point of the sensor bracket. The dynamometer pulling point is located along the dummy arm and 20 cm away from the center of the arm joint adjustment bolt. The pulling direction of the dynamometer is at a 90-degree angle to the dummy arm. The dynamometer is used to measure the force value at which the arm can start to move upward, and the force value is adjusted to within the range of 20±2.5N.

5. A method for calibrating the performance of a WorldSID 50th dummy arm as claimed in claim 1 or 2, characterized in that: In step S107, the evaluation criteria for the calibration result are: if the measured values ​​are within the allowable range, the calibration passes, otherwise it fails; specifically: The permissible range of the impact velocity measured by the velocity measuring device is 2.87-2.93 m / s; The permissible range of the swing arm acceleration measured by the acceleration sensor is 21.2 to 24.3 g; The allowable range of the shoulder force X-direction component measured by the shoulder force sensor is 201-252 N, and the allowable range of the shoulder force Z-direction component is 149-171 N; The allowable range of the arm rotation angle along the Y-axis measured by the rotation angular velocity sensor is 34.6~40.4°.

6. A method for calibrating the performance of a WorldSID 50th dummy arm as claimed in claim 2, characterized in that: In step S207, the evaluation criteria for the calibration result are: if the measured values ​​are within the allowable range, the calibration is passed, otherwise it is not passed; specifically: The permissible range of the impact velocity measured by the velocity measuring device is 4.23-4.31 m / s; The permissible range of the swing arm acceleration measured by the acceleration sensor is 21.0~22.8g; The allowable range of the shoulder force X-direction component measured by the shoulder force sensor is 115~145 N, the allowable range of the shoulder force Y-direction component is 448~480 N, and the allowable range of the shoulder force Z-direction component is 239~272 N; The allowable range of the arm bending angle along the X-axis measured by the bending angular velocity sensor is 31.9~34.2°.

7. A method for calibrating the performance of a WorldSID 50th dummy arm as claimed in claim 2, characterized in that: In step S201, the bending angular velocity sensor is installed 3 cm upward from the lowest end of the dummy's arm.

8. A method for calibrating the performance of a WorldSID 50th dummy arm as claimed in claim 1 or 2, characterized in that: The dummy arm is connected to the shoulder force sensor through the sensor bracket, the shoulder force sensor is connected to the shoulder bracket, and the shoulder bracket is connected to the adapter module.

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