CN113295364A - Dummy lumbar vertebra calibration method and device - Google Patents
Dummy lumbar vertebra calibration method and device Download PDFInfo
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- CN113295364A CN113295364A CN202110455824.8A CN202110455824A CN113295364A CN 113295364 A CN113295364 A CN 113295364A CN 202110455824 A CN202110455824 A CN 202110455824A CN 113295364 A CN113295364 A CN 113295364A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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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
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/0078—Shock-testing of vehicles
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Abstract
The invention provides a dummy lumbar vertebra calibration method, which comprises the following steps: before a dummy lumbar vertebra calibration experiment, the dummy lumbar vertebra is placed in an environment with a set temperature for more than 1 hour; vertically mounting the lumbar of the dummy on a lumbar calibration base of the dummy, and mounting a fixing rod on the surface of the lumbar; slowly pulling the fixed rod through a traction motor according to a set speed to enable the installation fixed rod to rotate by a set angle; collecting and recording the stretching length of the traction motor measured by the displacement sensor, and calculating the rotation angle of the lumbar vertebra according to a formula; the force of the tension sensor is collected and recorded, and whether the tension value and the lumbar vertebra rotation angle are set values or not is judged. According to the dummy lumbar vertebra calibration method and device, the difference of test results among different laboratories can be reduced, the robustness of the test results is improved, and comparison among laboratories is facilitated.
Description
Technical Field
The invention belongs to the field of automobile collision safety tests, and particularly relates to a dummy lumbar vertebra calibration method and device.
Background
At present, a WorldSID 50th dummy is used for evaluating the injury of a non-impact Side dummy in a Side collision, and researches show that the performance of the lumbar of the WorldSID dummy has great influence on the evaluation of the Far Side test result, but a calibration program and an evaluation standard of lumbar parts do not exist in a WorldSID dummy standard calibration project, and a WorldSID 50th dummy lumbar calibration method and a corresponding clamp are designed in the patent.
Disclosure of Invention
In view of the above, the invention aims to provide a dummy lumbar vertebra calibration method and a dummy lumbar vertebra calibration device, so as to solve the problem of poor repeatability of the Far Side test result, set the performance index of the lumbar vertebra and improve the repeatability of the test result.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a dummy lumbar vertebra calibration method comprises the following steps:
s1, vertically mounting the lumbar vertebra of the dummy on a lumbar vertebra calibration base of the dummy, and mounting a fixing rod on the surface of the lumbar vertebra;
s2, slowly pulling the fixed rod through the traction motor according to a set speed to enable the fixed rod to rotate by a set angle;
s3, measuring the deflection displacement distance of the fixed rod by using a displacement sensor, and calculating the lumbar vertebra rotation angle according to a formula;
and S4, measuring the traction force by using the tension sensor, and judging whether the tension value and the lumbar vertebra rotation angle are set values.
In step S1, the dummy lumbar vertebra is placed in the environment with the temperature of 20.6-22.2 ℃ for more than 1 hour.
The front and back directions of the lumbar vertebra in the step S1 are vertical to the plane where the lumbar vertebra calibration clamp is located, and the lumbar vertebra calibration initial angle is in the range of-1 degrees.
The set speed range in step S2 is between 1-2deg/S, and the fixed lever is rotated by 50 deg..
In step S3, the formula is as follows:
in the above formula
γ: the rotation angle of the fixing rod in the lumbar vertebra calibration process;
L0: an initial length of the haulage rope;
X：
s: a distance of the deflection displacement of the fixed rod measured by the displacement sensor.
Further, the determination criteria of step S5 are as follows: the value of the tension sensor on the traction rope is between 76 and 128N when the lumbar vertebra rotation angle theta is 40 degrees.
A dummy lumbar vertebra calibration device comprises a dummy lumbar vertebra calibration base, a dummy lumbar vertebra, a fixed rod, a tension sensor, a traction motor and a displacement sensor;
the dummy lumbar vertebra is installed on dummy lumbar vertebra calibration base, and the dead lever is fixed at dummy lumbar vertebra top, and tension sensor one end is passed through haulage rope and dead lever end connection, and tension sensor's the other end passes through the haulage rope and is connected with traction motor, moves sensor one end and is connected with fixed lever.
Furthermore, the artificial lumbar is made of rubber.
Further, the dummy lumbar vertebra is arranged on a dummy lumbar vertebra calibration base through a lumbar vertebra mounting bracket, the dummy lumbar vertebra calibration base comprises a bottom plate and a mounting table, and the mounting table is arranged on the mounting table through the lumbar vertebra mounting bracket arranged in the middle of the bottom plate;
the bottom plate is installed on the test bench, and the displacement sensor is installed beside the upper bottom plate of the test bench.
Furthermore, both sides of the lumbar of the dummy are arc-shaped, the middle position of the lumbar of the dummy is rectangular, and the length of the two side walls of the lumbar of the dummy is greater than that of the middle position of the lumbar of the dummy.
Further, the intermediate position of dummy's lumbar vertebrae and the both sides wall of dummy's lumbar vertebrae form U type groove, and the lumbar vertebrae installing support is the U type, and lumbar vertebrae support mounting is in U type inslot, and the U type groove lock of lumbar vertebrae installing support is on the mount table, and lumbar vertebrae installing support top all is equipped with the bolt hole with the lateral wall, and the dummy's lumbar vertebrae is installed in the bolt hole on the lumbar vertebrae support lateral wall, and the lumbar vertebrae support passes through the bolt hole at top to be fixed on the mount table.
Furthermore, a fixing rod mounting hole is formed in the top of the lumbar of the dummy, and the fixing rod is fixed to the top of the lumbar of the dummy through a bolt.
Furthermore, haulage rope one end is fixed on traction motor's gyro wheel, and displacement sensor's acting as go-between is walked around behind traction motor's the gyro wheel and is connected with dead lever one end, and force transducer installs on the haulage rope.
Compared with the prior art, the dummy lumbar vertebra calibration method and the dummy lumbar vertebra calibration device have the following beneficial effects:
(1) according to the dummy lumbar vertebra calibration method and device, the difference of test results among different laboratories can be reduced, the robustness of the test results is improved, and comparison among laboratories is facilitated.
(2) The device provided by the invention has the advantages that the traction motor is used for drawing the traction rope to further draw the fixed rod to rotate, the readings of the tension sensor and the displacement sensor are recorded in the process, and the consistency of the lumbar performance of the WorldSID dummy is ensured by judging the result, so that the stability of the result of the collision test is ensured.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a first structural diagram of a lumbar vertebra calibration device of a dummy according to an embodiment of the present invention;
FIG. 2 is a second structural diagram of a lumbar vertebrae calibration device of a dummy according to an embodiment of the present invention;
FIG. 3 is a third structural diagram of a lumbar vertebra calibration device of a dummy according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating dimensions of a fixing rod according to an embodiment of the present invention;
figure 5 is a schematic view of a lumbar calibration base according to an embodiment of the present invention;
fig. 6 is a fourth structural diagram of a lumbar vertebra calibration device of a dummy according to an embodiment of the present invention.
Description of reference numerals:
1-lumbar vertebra calibration base; 2-lumbar vertebra mounting bracket; 3-dummy lumbar vertebra; 4-fixing the rod; 5-a tension sensor; 6-a traction rope; 7-a traction motor; 8-displacement sensor.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless explicitly set and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 to 6, a dummy lumbar vertebra calibration method comprises the following steps:
s1, vertically mounting the lumbar vertebra of the dummy on a lumbar vertebra calibration base of the dummy, and mounting a fixing rod on the surface of the lumbar vertebra;
s2, slowly pulling the fixed rod through the traction motor according to a set speed to enable the fixed rod to rotate by a set angle;
s3, measuring the deflection displacement distance of the fixed rod by using a displacement sensor, and calculating the lumbar vertebra rotation angle according to a formula;
and S4, measuring the traction force by using the tension sensor, and judging whether the tension value and the lumbar vertebra rotation angle are set values.
In step S1, the dummy lumbar vertebra is placed in the environment with the temperature of 20.6-22.2 ℃ for more than 1 hour.
The front and back directions of the lumbar vertebra in the step S1 are vertical to the plane where the lumbar vertebra calibration clamp is located, and the lumbar vertebra calibration initial angle is in the range of-1 degrees.
The set speed range in step S2 is between 1-2deg/S, and the fixed lever is rotated by 50 deg..
In step S3, the formula is as follows:
in the above formula
γ: the rotation angle of the fixing rod in the lumbar vertebra calibration process;
L0: an initial length of the haulage rope;
X：
s: a distance of the deflection displacement of the fixed rod measured by the displacement sensor.
The judgment criteria of step S5 are as follows: the value of the tension sensor on the traction rope is between 76 and 128N when the lumbar vertebra rotation angle theta is 40 degrees.
A WORDSID 50TH dummy lumbar vertebra 3 calibration device comprises a dummy lumbar vertebra 3 calibration base 1, a dummy lumbar vertebra 3, a fixed rod 4, a tension sensor 5, a traction motor 7 and a displacement sensor 8;
the dummy lumbar vertebra 3 is installed on dummy lumbar vertebra 3 demarcation base 1, and dead lever 4 is fixed at 3 tops of dummy lumbar vertebra, and 5 one end of force sensor pass through haulage rope 6 and 4 end connection of dead lever, and force sensor 5's the other end passes through haulage rope 6 and is connected with traction motor 7, and 8 one end of displacement sensor are connected with dead lever 4.
The top of the fixed rod 4 is provided with a bulge, the bulge is provided with two traction rope 6 mounting holes, the size of the two traction rope 6 mounting holes is 4mm, the distance between the two traction rope 6 mounting holes is 6mm, the length of the bulge is 50mm, the width of the bulge is 36mm, the length of the lower half part of the fixed rod 4 is 155mm, the width of the lower half part of the fixed rod is 64mm, the thickness of the lower half part of the fixed rod is 4mm, an installation part is arranged at the bottom of the fixed rod 4, the width of the installation part is 25mm, the length of the installation part is 64mm, and the thickness of the installation part is 4 mm;
the dummy lumbar vertebra 3 is made of rubber, and the type adopts WordSID 50th type.
The dummy lumbar vertebra 3 is arranged on a dummy lumbar vertebra 3 calibration base 1 through a lumbar vertebra mounting bracket 2, the dummy lumbar vertebra 3 calibration base 1 comprises a bottom plate and a mounting table, and the mounting table is arranged on the middle position of the bottom plate, and the lumbar vertebra mounting bracket 2 is arranged on the mounting table;
the bottom plate is installed on the test bench, and displacement sensor 8 is installed beside the upper bottom plate of the test bench.
The distance between the displacement sensor 8 and the center of the mounting table is 737.5mm-742.5 mm.
The two sides of the dummy lumbar vertebra 3 are arc-shaped, the middle position of the dummy lumbar vertebra 3 is rectangular, and the length of the two side walls of the dummy lumbar vertebra 3 is larger than that of the middle position of the dummy lumbar vertebra 3.
As shown in the figure, the two side walls of the lumbar vertebra 3 of the dummy are arc-shaped plates, the two rectangular plates are arranged in the middle of the lumbar vertebra 3 of the dummy, the top and the bottom of the lumbar vertebra 3 of the dummy are supported into a rectangular shape by the two rectangular plates, and the bottoms of the two arc-shaped plates and the bottoms of the two rectangular plates form a U-shaped groove.
The intermediate position of dummy's lumbar vertebrae 3 and dummy's lumbar vertebrae 3 both sides wall form U type groove, and lumbar vertebrae installing support 2 is the U type, and lumbar vertebrae support mounting is in U type inslot, and the U type groove lock of lumbar vertebrae installing support 2 is on the mount table, and 2 tops of lumbar vertebrae installing support all are equipped with the bolt hole with the lateral wall, and the bolt hole on the lumbar vertebrae support lateral wall is installed to dummy's lumbar vertebrae 3, and the lumbar vertebrae support passes through the bolt hole at top to be fixed on the mount table.
The top of the dummy lumbar vertebra 3 is provided with a fixing rod mounting hole, and the fixing rod 4 is fixed on the top of the dummy lumbar vertebra 3 through a bolt.
The length of the bottom plate is 200mm, and the width of the bottom plate is 100 mm;
the height of the mounting table is 22mm, the length is 64mm, and the width is 63 mm;
first mounting holes are formed in four corners of the bottom plate, the diameter of each first mounting hole is 9mm, the distance between each first mounting hole and the width edge of the bottom plate is 25mm, the distance between each first mounting hole and the length edge of the bottom plate is 15mm, the distance between the two first mounting holes is 150mm based on the length direction of the bottom plate, and the distance between the two first mounting holes is 70mm based on the width direction of the bottom plate;
the four corners of the mounting table are provided with second mounting holes, the diameter of each second mounting hole is 6mm, the distance between each second mounting hole and the width edge of the mounting table is 14.5mm, the distance between each first mounting hole and the length edge of the mounting table is 9.5mm, the two first mounting holes are 40mm based on the length direction of the mounting table, and the distance between the two first mounting holes is 40mm based on the width direction of the mounting table;
the height of the lumbar vertebra 3 of the dummy is between 82.5mm and 87.5mm,
one end of a traction rope 6 is fixed on a roller of a traction motor 7, a pull wire of a displacement sensor 8 bypasses the roller of the traction motor 7 and then is connected with one end of a fixed rod 4, and a tension sensor 5 is arranged on the traction rope 6;
the displacement sensor 8 and the traction motor 7 are arranged on the plane of the offset direction of the fixed rod 4.
Through traction motor 7's gyro wheel removal, traction motor 7 pulling haulage rope 6 makes dead lever 4 take place angular rotation, and displacement sensor 8's the end of acting as go-between is lax, and it kick-backs to the displacement sensor 8 in to displacement sensor 8 records dead lever offset distance, thereby tension sensor 5 records the pulling force of haulage rope 6.
Wherein the tension sensor is INTERFACE SML-50 type;
concrete websites are as follows: https: // www.interfaceforce.com/products/interface-mini/overload-protected/sml-mini-low-height-s-type-load-cell `
The displacement sensor adopts JEBOOL WY-1500 model
Concrete websites are as follows: http: // www.jebool.com/a/products/lm1/82.html
The specific implementation is as follows:
the method comprises the steps of fixing a dummy lumbar vertebra calibration base 1 through 4 phi 9 through holes, connecting a dummy lumbar vertebra mounting support 2 with the base 1 through four M6X1X16 flat through screws, fixing a dummy lumbar vertebra 3 on the dummy lumbar vertebra mounting support 2, connecting a dummy lumbar vertebra fixing rod 4 with the dummy lumbar vertebra 3, measuring the tension of a traction motor 7 in the operation process by using a tension sensor 5, and measuring the tension S of a traction rope 6 by using a displacement sensor 7. And finishing the assembly of the calibration equipment.
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, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A dummy lumbar vertebra calibration method is characterized by comprising the following steps:
s1, vertically mounting the lumbar vertebra of the dummy on a lumbar vertebra calibration base of the dummy, and mounting a fixing rod on the surface of the lumbar vertebra;
s2, slowly pulling the fixed rod through the traction motor according to a set speed to enable the fixed rod to rotate by a set angle;
s3, measuring the deflection displacement distance of the fixed rod by using a displacement sensor, and calculating the lumbar vertebra rotation angle according to a formula;
and S4, measuring the traction force by using the tension sensor, and judging whether the tension value and the lumbar vertebra rotation angle are set values.
2. The dummy lumbar vertebra calibration method according to claim 1, wherein: in step S1, the dummy lumbar vertebra is placed in the environment with the temperature of 20.6-22.2 ℃ for more than 1 hour.
3. The dummy lumbar vertebra calibration method according to claim 1, wherein: the front and back directions of the lumbar vertebra in the step S1 are vertical to the plane where the lumbar vertebra calibration clamp is located, and the lumbar vertebra calibration initial angle is in the range of-1 degrees.
4. The dummy lumbar vertebra calibration method according to claim 1, wherein: the set speed range in step S2 is between 1-2deg/S, and the fixed lever is rotated by 50 deg..
5. The dummy lumbar vertebra calibration method according to claim 1, wherein: in step S3, the formula is as follows:
in the above formula
γ: the rotation angle of the fixing rod in the lumbar vertebra calibration process;
L0: an initial length of the haulage rope;
X：
s: a distance of the deflection displacement of the fixed rod measured by the displacement sensor.
6. The dummy lumbar vertebra calibration method according to claim 1, wherein: the formula in step S4 is: the judgment criteria of step S4 are as follows: the value of the tension sensor on the traction rope is between 76 and 128N when the lumbar vertebra rotation angle theta is 40 degrees.
7. A dummy lumbar vertebra calibration device is characterized by comprising a dummy lumbar vertebra calibration base (1), a dummy lumbar vertebra (3), a fixing rod (4), a tension sensor (5), a traction motor (7) and a displacement sensor (8);
the dummy lumbar vertebra (3) is installed on the dummy lumbar vertebra calibration base (1), the fixing rod (4) is fixed at the top of the dummy lumbar vertebra (3), one end of the tension sensor (5) is connected with the end of the fixing rod (4) through the traction rope (6), the other end of the tension sensor (5) is connected with the traction motor (7) through the traction rope (6), and one end of the displacement sensor (8) is connected with the fixing lever (4).
8. The lumbar vertebra calibration device of the dummy as claimed in claim 7, wherein: the dummy lumbar vertebra (3) is made of rubber.
9. The lumbar vertebra calibration device of the dummy as claimed in claim 7, wherein: the dummy lumbar vertebra (3) is arranged on a dummy lumbar vertebra calibration base (1) through a lumbar vertebra mounting bracket (2), the dummy lumbar vertebra calibration base (1) comprises a bottom plate and a mounting table, and the mounting table is arranged on the mounting table through the lumbar vertebra mounting bracket (2) arranged in the middle of the bottom plate;
the bottom plate is arranged on the test bench, and the displacement sensor (8) is arranged beside the upper bottom plate of the test bench;
both sides of the dummy lumbar vertebra (3) are arc-shaped, the middle position of the dummy lumbar vertebra (3) is rectangular, and the length of the two side walls of the dummy lumbar vertebra (3) is greater than that of the middle position of the dummy lumbar vertebra (3);
the middle position of the lumbar vertebra (3) of the dummy and two side walls of the lumbar vertebra of the dummy form a U-shaped groove, the lumbar vertebra mounting bracket (2) is U-shaped, the lumbar vertebra bracket is mounted in the U-shaped groove, the U-shaped groove of the lumbar vertebra mounting bracket (2) is buckled on the mounting table, bolt holes are formed in the top and the side walls of the lumbar vertebra mounting bracket (2), the lumbar vertebra (3) of the dummy is mounted in the bolt holes in the side walls of the lumbar vertebra bracket, and the lumbar vertebra bracket is fixed on the mounting table through the bolt holes in the top;
the top of the dummy lumbar vertebra (3) is provided with a fixing rod mounting hole, and the fixing rod (4) is fixed on the top of the dummy lumbar vertebra (3) through a bolt.
10. The lumbar vertebra calibration device of the dummy as claimed in claim 7, wherein: one end of a traction rope (6) is fixed on a roller of a traction motor (7), a stay wire of a displacement sensor (8) is connected with one end of a fixing rod (4) after bypassing the roller of the traction motor (7), and a tension sensor (5) is installed on the traction rope (6).
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| CN202110455824.8A CN113295364B (en) | 2021-04-26 | 2021-04-26 | Dummy lumbar vertebra calibration method and device |
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