CN112304552A - Positioning method for determining measurement point of acceleration sensor of head type impact module - Google Patents
Positioning method for determining measurement point of acceleration sensor of head type impact module Download PDFInfo
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- CN112304552A CN112304552A CN202011142755.7A CN202011142755A CN112304552A CN 112304552 A CN112304552 A CN 112304552A CN 202011142755 A CN202011142755 A CN 202011142755A CN 112304552 A CN112304552 A CN 112304552A
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- acceleration sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
Abstract
The invention discloses a positioning method for determining a measurement point of an acceleration sensor of a head type impact module, which comprises the following steps: s1, fixing two acceleration sensors with the same type on a mounting platform, carrying out a first pedestrian protection head type impact test, and recording an output acceleration peak value; s2, adjusting the relative position between the two acceleration sensors along the longitudinal direction of the mounting platform, performing a second pedestrian protection head type impact test, and recording the output acceleration peak value; s3, determining the distance between the measuring point on the acceleration sensor and the connecting line of the mounting hole, adjusting the positions of the two acceleration sensors, performing pedestrian protection head type impact test, and recording the output acceleration peak values A13 and A23; if A13 and A23 are equal, the positioning of the measuring point is successful, and if A13 and A23 are not equal, S1 and S2 are repeated. The impact test method can eliminate the influence of acceleration sensors of different brands and models on the impact test result of the head type impact module, and improve the accuracy of test data.
Description
Technical Field
The invention relates to a pedestrian protection head type impact test, in particular to a positioning method for determining a measurement point of an acceleration sensor of a head type impact module.
Background
The pedestrian protection laws and evaluation rules require that the acceleration sensor is mounted to the centroid position, i.e., the geometric center, of the head-type impact module. Usually, the acceleration sensor is fixed to the head impact module by a mounting platform, i.e. the mounting position of the acceleration sensor is fixed. When the acceleration sensor works, the testing direction is vertical to the mounting surface, and for the condition that the stress direction of the tested sample is vertical to the mounting surface of the acceleration sensor, the position change of the acceleration sensor in the mounting plane does not influence the testing result. However, for a spherical impactor such as a head type impact module, the stress direction is not fixed and is not perpendicular to the mounting surface of the acceleration sensor, and the position of the measuring point of the acceleration sensor directly influences the test result.
The acceleration sensors of different brands and models have different distances between the sensitive element and the mounting hole of the acceleration sensor, so that the measurement points of the acceleration sensors of different brands and models are possibly different under the same mounting position of the mounting platform, the accuracy of a test result is directly influenced, and the test result is larger or smaller.
Disclosure of Invention
The invention aims to provide a positioning method for determining a measuring point of an acceleration sensor of a head type impact module, which can effectively position the measuring point position of the acceleration sensor, eliminate the influence of acceleration sensors of different brands and models on the impact test result of the head type impact module and improve the accuracy of test data.
The invention relates to a positioning method for determining a measurement point of an acceleration sensor of a head type impact module, which comprises the following steps:
s1, fixing two acceleration sensors with the same type on a mounting platform of a head type impact module in parallel, staggering the two acceleration sensors, performing a first pedestrian protection head type impact test, and recording acceleration peak values A11 and A21 output by the two acceleration sensors;
s2, adjusting the relative position between the two acceleration sensors along the longitudinal direction of the mounting platform, performing a second pedestrian protection head type impact test, and recording acceleration peak values A12 and A22 output by the two acceleration sensors;
s3, determining the distance between a measuring point on the acceleration sensor and a connecting line of the mounting hole according to acceleration peak data obtained by two pedestrian protection head type impact tests and marking on the acceleration sensor; adjusting the positions of the two acceleration sensors to enable the connection line of the marked measuring points of the two acceleration sensors to pass through the circle center of the mounting platform, then performing a pedestrian head protection type impact test, and recording acceleration peak values A13 and A23 output by the two acceleration sensors; if A13 and A23 are equal, the positioning of the measuring point is successful, and if A13 and A23 are not equal, S1 and S2 are repeated.
Further, in S1, two acceleration sensors are disposed on two sides of the longitudinal centerline of the mounting platform, and the distances from the two acceleration sensors to the longitudinal centerline are equal.
Further, the wiring holes of the two acceleration sensors face opposite directions.
Furthermore, the number of the mounting holes of the acceleration sensor is two, and the measuring points of the acceleration sensor are positioned on the perpendicular bisector of the connecting line of the mounting holes.
Further, the longitudinal distance x1 between the measurement points of the two acceleration sensors in S1 or the longitudinal distance x2 between the measurement points of the two acceleration sensors in S2 was calculated from the experimental data,
x1=（A11-A21）*（d2–d1）/（A12–A22+A21–A11），
x2=（A12-A22）*（d2–d1）/（A12–A22+A21–A11），
in the formula, d1 is the distance between the connecting lines of the two acceleration sensor mounting holes in S1, and d2 is the distance between the connecting lines of the two acceleration sensor mounting holes in S2; the distance between the measuring point on the acceleration sensor and the connecting line of the mounting hole is 0.5 (d 1-x 1) or 0.5 (d 2-x 2) according to the geometrical relation.
According to the invention, the mounting position of the acceleration sensor and the pedestrian protection head type impact test are adjusted for multiple times, and the position of the measurement point of the acceleration sensor is obtained through calculation of the test data, so that the original mounting position of the acceleration sensor on the mounting platform is adjusted, the measurement point of the acceleration sensor is ensured to be coincided with the spherical center of the head type impact module, the influence of the acceleration sensors of different brands and models on the pedestrian protection head type impact test result is eliminated, and the accuracy of the test data is improved.
Drawings
FIG. 1 is a schematic structural view of a head impact module according to the present invention;
FIG. 2 is a schematic view of an acceleration sensor according to the present invention;
FIG. 3 is a schematic illustration of the positions of two acceleration sensors during a first pedestrian protection head impact test;
FIG. 4 is a schematic illustration of the positions of two acceleration sensors during a second pedestrian head impact test;
fig. 5 is a schematic diagram of the positions of two acceleration sensors at the time of experimental verification.
In the figure, 1-cover plate, 2-head model part, 3-mounting platform, 4-acceleration sensor, 41-mounting hole, 42-measuring point, 5-cable, 6-cowl panel.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the illustrated head-shaped impact module includes a cover plate 1 and a hemispherical head-shaped model part 2, the cover plate 1 closes an opening of the head-shaped model part 2 to form a cavity, a cylindrical mounting platform 3 is convexly disposed in a middle portion of one side of the cover plate 1 close to the cavity, referring to fig. 2, an acceleration sensor 4 is fixed on the mounting platform 3 through a mounting hole 41, a measuring point 42 of the acceleration sensor 4 is located on a center line of the mounting platform 3, and meanwhile, it is ensured that the measuring point 42 coincides with a center of a sphere of the head-shaped model part 2, it should be noted that, since the mounting platform 3 is a cylinder, the center line is a line connecting centers of an upper circle and a lower circle. The output end of the acceleration sensor 4 is connected with a cable 5, and the cable 5 is led out from the head type impact module and connected with a data acquisition instrument. Generally, the number of the mounting holes 41 of the acceleration sensor 4 is two, and the measuring point 42 of the acceleration sensor 4 is located on the perpendicular bisector of the connecting line of the mounting holes 41.
A method for determining the location of a measurement point of an acceleration sensor of a head-mounted impact module, comprising the steps of:
s1, referring to fig. 3, selecting two acceleration sensors 4 with the same model, fixing the two acceleration sensors 4 on the mounting platform 3 of the head-type impact module in parallel, where the two acceleration sensors 4 are disposed on two sides of a longitudinal center line of the mounting platform 3, and distances from the two acceleration sensors 4 to the longitudinal center line are equal, where the longitudinal center line refers to a longitudinal center line of a mounting end surface of the mounting platform 3. The wiring holes of the two acceleration sensors 4 are oriented oppositely, facilitating the extraction of the cable 5 from the head-type impact module.
After the acceleration sensor 4 is arranged, the cover plate 1 with the acceleration sensor 4 is fixedly connected with the head-shaped model part 2, and then the whole head-shaped impact module is connected with the transmitting module to carry out a first pedestrian head-shaped impact test. The head type impact module impacts the front cover plate 6 under the action of the transmitting module, and acceleration peak values A11 and A21 output by the two acceleration sensors 4 are obtained and recorded through the data acquisition instrument.
S2, detaching the cover plate 1, adjusting the relative position between the two acceleration sensors 4 along the longitudinal direction of the mounting plane of the mounting platform 3, performing a second pedestrian protection head type impact test, and acquiring and recording acceleration peak values A12 and A22 output by the two acceleration sensors through a data acquisition instrument, referring to FIG. 4;
s3, determining the distance between a measuring point on the acceleration sensor and a connecting line of the mounting hole according to acceleration peak data obtained by two pedestrian protection head type impact tests and marking on the acceleration sensor; the method specifically comprises the following steps:
from the acceleration sensor characteristics it can be determined: (A11-A21): x1= (a 12-a 22): x2, d 1-d 2= x 1-x 2; wherein, a11, a21, a12 and a22 are test data, d1 is a distance between a connecting line of a mounting hole of an acceleration sensor and a connecting line of a mounting hole of another acceleration sensor in S1, d2 is a distance between a connecting line of a mounting hole of an acceleration sensor and a connecting line of a mounting hole of another acceleration sensor in S2, d1 and d2 can be directly measured and calculated to obtain:
x1=（A11-A21）*（d2–d1）/（A12–A22+A21–A11），
x2= (a 12-a 22) × (d 2-d 1)/(a 12-a22 + a 21-a 11), where x1 is the longitudinal distance between the measurement points of the two acceleration sensors in S1, and x2 is the longitudinal distance between the measurement points of the two acceleration sensors in S2.
And (3) test verification, referring to fig. 5, adjusting the positions of the two acceleration sensors 4 to enable the connection line of the marked measurement points 42 of the two acceleration sensors 4 to pass through the circle center of the mounting platform 3, then performing a pedestrian protection head type impact test, and acquiring and recording acceleration peak values A13 and A23 output by the two acceleration sensors 4 through a data acquisition instrument. If A13 and A23 are equal, the positioning of measurement point 42 is successful. If a13 and a23 are not equal, the self error and the man-made operation error of the acceleration sensor 4 are eliminated, and then S1 and S2 are repeated.
After the measurement point 42 is successfully positioned, the mounting position on the mounting platform 3 can be determined according to the positions of the mounting hole 41 and the measurement point 42 on the acceleration sensor 1, the coincidence of the measurement point 42 of the acceleration sensor 4 and the sphere center of the head type impact module is ensured, the influence of acceleration sensors of different brands and models on the pedestrian protection head type impact test result is eliminated, and the accuracy of test data is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A method for determining the location of a measurement point of an acceleration sensor of a head-mounted impact module, comprising the steps of:
s1, fixing two acceleration sensors (4) with the same model number on a mounting platform (3) of a head type impact module in parallel, staggering the two acceleration sensors (4) to perform a first pedestrian head type protection impact test, and recording acceleration peak values A11 and A21 output by the two acceleration sensors (4);
s2, adjusting the relative position between the two acceleration sensors (4) along the longitudinal direction of the mounting platform (3), performing a second pedestrian protection head type impact test, and recording acceleration peak values A12 and A22 output by the two acceleration sensors (4);
s3, determining the distance between the connecting line of the measuring point (42) and the mounting hole (41) on the acceleration sensor (4) according to acceleration peak data obtained by two pedestrian protection head type impact tests and marking on the acceleration sensor (4); then adjusting the positions of the two acceleration sensors (4) to enable the connection line of the marked measuring points (42) of the two acceleration sensors (4) to pass through the circle center of the mounting platform (3), then performing a pedestrian protection head type impact test, and recording acceleration peak values A13 and A23 output by the two acceleration sensors (4);
if A13 and A23 are equal, the positioning of the measuring point is successful, and if A13 and A23 are not equal, S1 and S2 are repeated.
2. The method for determining the positioning of the measurement points of the acceleration sensor of a head-type impact module according to claim 1, characterized in that: in the S1, the two acceleration sensors (4) are arranged on two sides of the longitudinal center line of the mounting platform (3), and the distances from the two acceleration sensors (4) to the longitudinal center line are equal.
3. Method for determining the positioning of the measurement points of an acceleration sensor of a head-type impact module according to claim 1 or 2, characterized in that: the wiring holes of the two acceleration sensors (4) face opposite directions.
4. Method for determining the positioning of the measurement points of an acceleration sensor of a head-type impact module according to claim 1 or 2, characterized in that: the number of the mounting holes (41) of the acceleration sensor (4) is two, and the measuring point (42) of the acceleration sensor (4) is located on the perpendicular bisector of the connecting line of the mounting holes (41).
5. Method for determining the positioning of the measurement points of an acceleration sensor of a head-type impact module according to claim 1 or 2, characterized in that: the longitudinal distance x1 between the measuring points of the two acceleration sensors in S1 or the longitudinal distance x2 between the measuring points of the two acceleration sensors in S2 is calculated from the test data,
x1=（A11-A21）*（d2–d1）/（A12–A22+A21–A11），
x2=（A12-A22）*（d2–d1）/（A12–A22+A21–A11），
in the formula, d1 is the distance between the connecting lines of the two acceleration sensor mounting holes in S1, and d2 is the distance between the connecting lines of the two acceleration sensor mounting holes in S2; the distance between the measuring point on the acceleration sensor and the connecting line of the mounting hole is 0.5 (d 1-x 1) or 0.5 (d 2-x 2) according to the geometrical relation.
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