CN116106036B - Method and device for adjusting head mass center of automobile collision dummy - Google Patents

Method and device for adjusting head mass center of automobile collision dummy Download PDF

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Publication number
CN116106036B
CN116106036B CN202310354428.5A CN202310354428A CN116106036B CN 116106036 B CN116106036 B CN 116106036B CN 202310354428 A CN202310354428 A CN 202310354428A CN 116106036 B CN116106036 B CN 116106036B
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balancing weight
centroid
mass
coordinate
direction displacement
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CN116106036A (en
Inventor
刘志新
刘伟东
范正奇
冀跃臣
武永强
王凯
薄旭盛
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China Automotive Technology and Research Center Co Ltd
CATARC Automotive Test Center Tianjin Co Ltd
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China Automotive Technology and Research Center Co Ltd
CATARC Automotive Test Center Tianjin Co Ltd
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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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation

Abstract

The invention relates to the field of automobile safety collision test, and discloses a method and equipment for adjusting the mass center of a head of an automobile collision dummy. The method comprises the following steps: clamping the first balancing weight by using a clamping plate, so that the mass center position of the first balancing weight coincides with the mass center position of the displacement adjusting device; the displacement adjusting device is utilized to drive the clamping plate to move, so that the mass center of the first balancing weight is positioned at the first mass center coordinate, and one side of the first balancing weight, which is far away from the clamping plate, is attached to the first plane part; after the first balancing weight is fixedly connected with the first plane part, removing the clamping plate; clamping the second balancing weight by using a clamping plate, so that the mass center position of the second balancing weight coincides with the mass center position of the displacement adjusting device; the displacement adjusting device is used for driving the clamping plate to move, so that the mass center of the second balancing weight is positioned at the second mass center coordinate, and one side, far away from the clamping plate, of the second balancing weight is attached to the second plane part; and after the second balancing weight is fixedly connected with the second plane part, removing the clamping plate to obtain the preset dummy head with the adjusted mass center.

Description

Method and device for adjusting head mass center of automobile collision dummy
Technical Field
The invention relates to the field of automobile safety collision test, in particular to a method and equipment for adjusting the mass center of a head of an automobile collision dummy.
Background
The automobile crash dummy is high-end detection equipment for evaluating automobile safety, is an important technical weight for measuring automobile safety performance, replaces a true person with the crash dummy for performing a crash test, and can simulate human body damage conditions under different conditions. The head design of collision dummy is a key ring in the development process of dummy, the dummy head needs to be matched with the real head, and the head quality and mass center position are strictly regulated to improve biological fidelity and ensure the accuracy of evaluating head damage. The dummy head consists of skin and skull, the skin is prepared by a slush molding process, and the skull is processed by a casting process, but the problems of uneven mass distribution and the like are easily caused due to a plurality of processing procedures and complex influence factors, errors are generated, and the deviation exists between the actual position and the design position of the mass center of the head, so that a method for adjusting the mass center of the head of the collision dummy needs to be researched to eliminate the deviation, and the mass center of the head is more in accordance with the design requirement to obtain a more accurate collision test damage result.
The collision dummy head is internally provided with a cavity, and the two sides of the inner wall of the cavity are provided with balancing weights to adjust the mass center position of the head, so that the design requirement of the mass center of the head can be met. The prior art is mainly applied to the mass center adjustment of an object with a regular shape and structure, and the mass center is adjusted by adding a counterweight through various devices, but the existing adjusting equipment has a complex structure and a complex operation method, and is not suitable for the head of a collision dummy with an irregular shape and a cavity inside. Therefore, the method for adjusting the mass center of the head of the automobile crash dummy is urgently needed in China, expensive and complex equipment and time and labor-consuming instruments are not needed, so that the accuracy of test results is improved, and the cost is reduced.
In view of this, the present invention has been made.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method and equipment for adjusting the mass center of the head of an automobile crash dummy, which can improve the accuracy of adjusting the mass center of the head of the automobile crash dummy, reduce the cost of mass center adjustment, reduce the structural complexity of mass center adjusting equipment and simplify the adjusting operation method.
The embodiment of the invention provides a method for adjusting the mass center of a head of an automobile collision dummy, which is executed by an automobile collision dummy head mass center adjusting device, the automobile collision dummy head mass center adjusting device comprises a clamping plate, a displacement adjusting device connected with the clamping plate, a balancing weight and a preset dummy head fixedly arranged, wherein the balancing weight comprises a first balancing weight and a second balancing weight, a first plane part is arranged on the right side inside the preset dummy head, a second plane part is arranged on the left side inside the preset dummy head, the first balancing weight and the second balancing weight are cuboid, the mass ratio of the first balancing weight to the second balancing weight is the preset mass ratio, the sum of the masses of the first balancing weight and the second balancing weight is determined by the actual mass and the theoretical mass of the preset dummy head, the size of the first balancing weight is determined by the size of the first plane part and the mass of the first balancing weight, the size of the second balancing weight is determined by the size of the first balancing weight, the distance between the center of the first plane part and the center of the second plane part, the equivalent mass and the equivalent mass comprises the equivalent mass ratio:
Clamping the first balancing weight by using the clamping plate, so that the mass center position of the first balancing weight coincides with the mass center position of the displacement adjusting device;
the displacement adjusting device is utilized to drive the clamping plate to move, so that the mass center of the first balancing weight is located at a first mass center coordinate, one side, away from the clamping plate, of the first balancing weight is attached to the first plane part, and the first mass center coordinate is determined based on the distance between the center of the first plane part and the center of the second plane part, the thickness of the first balancing weight and the equivalent mass center coordinate of the balancing weight;
after the first balancing weight is fixedly connected with the first plane part, removing the clamping plate;
clamping the second balancing weight by using the clamping plate, so that the mass center position of the second balancing weight coincides with the mass center position of the displacement adjusting device;
the displacement adjusting device is utilized to drive the clamping plate to move, so that the mass center of the second balancing weight is located at a second mass center coordinate, one side, away from the clamping plate, of the second balancing weight is attached to the second plane part, and the second mass center coordinate is determined based on the distance between the center of the first plane part and the center of the second plane part, the thickness of the second balancing weight and the equivalent mass center coordinate of the balancing weight;
And removing the clamping plate after the second balancing weight is fixedly connected with the second plane part, so as to obtain the preset dummy head with the adjusted mass center.
The embodiment of the invention provides a mass center adjusting device for an automobile crash dummy head, which is used for realizing the mass center adjusting method for the automobile crash dummy head, and comprises a preset dummy head, a fixed platform, a dummy head fixing device, a clamping plate device, a displacement adjusting device connected with the clamping plate device and balancing weights, wherein the balancing weights comprise a first balancing weight and a second balancing weight, a first plane part is arranged on the right side inside the preset dummy head, a second plane part is arranged on the left side inside the preset dummy head, the first balancing weight and the second balancing weight are cuboid, the mass ratio of the first balancing weight to the second balancing weight is the preset mass ratio, the sum of the masses of the first balancing weight and the second balancing weight is determined by the actual mass and the theoretical mass of the preset dummy head, the size of the first balancing weight is determined by the size of the first plane part, the distance between the center of the first plane part and the center of the second balancing weight, and the equivalent mass center of the second balancing weight, and the equivalent mass of the balancing weight are determined, wherein:
The fixing platform is used for fixing the dummy head fixing device and the displacement adjusting device;
the dummy head fixing device is used for fixing a preset dummy head;
the clamping plate device is used for clamping the first balancing weight, so that the mass center position of the first balancing weight coincides with the mass center position of the displacement adjusting device;
the displacement adjusting device is used for driving the clamping plate device to move, so that the mass center of the first balancing weight is located at a first mass center coordinate, one side, away from the clamping plate device, of the first balancing weight is fixedly connected with the first plane part, and the first mass center coordinate is determined based on the distance from the center of the first plane part to the center of the second plane part, the thickness of the first balancing weight and the equivalent mass center coordinate of the balancing weight;
the clamping plate device is also used for clamping the second balancing weight so that the mass center position of the second balancing weight coincides with the mass center position of the displacement adjusting device;
the displacement adjusting device drives the clamping plate device to move, so that the mass center of the second balancing weight is located at a second mass center coordinate, one side, away from the clamping plate device, of the second balancing weight is fixedly connected with the second plane portion, and the preset dummy head after mass center adjustment is obtained, wherein the origin of a coordinate system corresponding to the first mass center coordinate, the second mass center coordinate and the equivalent mass center coordinate is the circle center of the lower surface of the dummy head fixing device.
The embodiment of the invention has the following technical effects:
the balancing weights for adjusting the mass center are designed into the first balancing weight and the second balancing weight by combining the shape characteristics of the head of the automobile collision dummy, and are respectively placed on the left side and the right side of the head of the automobile collision dummy, so that the mass center adjusting cost is reduced, the structural complexity of mass center adjusting equipment is reduced, and meanwhile, the adjusting operation method is simplified; the first mass center coordinates and the second mass center coordinates of the first balancing weight and the second balancing weight are determined in advance based on the information such as the actual mass, the theoretical mass, the first balancing weight mass, the second balancing weight mass, the distance from the center of the first plane part to the center of the second plane part, the size of the first balancing weight, the size of the second balancing weight and the equivalent mass center coordinates of the balancing weight, and the accuracy of mass center adjustment of the head of the automobile collision dummy is improved by placing the first balancing weight and the second balancing weight at the positions matched with the corresponding mass center coordinates based on the mass center adjustment device for the head of the automobile collision dummy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for adjusting the center of mass of a head of an automobile crash dummy according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a device for adjusting the center of mass of a head of a crash dummy for an automobile according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a device for adjusting the center of mass of a head of an automobile crash dummy according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a displacement adjustment device according to an embodiment of the present invention;
FIG. 5 is a schematic view of a head of a crash dummy for a vehicle according to an embodiment of the present invention;
fig. 6 is a front view of a head of a crash dummy for an automobile after a counterweight is placed in the front view according to an embodiment of the invention.
Reference numerals illustrate:
1. presetting a dummy head; 2. a centroid coordinates display; 3. zero clearing button of barycenter coordinates; 4. a dummy head fixing device; 5. a fixed platform; 6. an x-direction displacement sensor; 7. a z-direction displacement sensor; 8. a z-direction displacement adjustment device; 9. an x-direction displacement adjustment device; 10. a y-direction displacement adjustment device; 11. a y-direction displacement sensor; 12. a first balancing weight; 13. presetting a bolt hole for connecting the dummy head with the dummy head fixing device; 14. a clamping plate device; 15. a z-direction displacement adjustment knob; 16. a z-direction displacement fixing knob; 17. a y-direction displacement adjustment knob; 18. an x-direction displacement adjustment knob; 19. displacement of the scale marks in the x direction; 20. the scale mark is displaced in the y direction; 21. the scale mark is displaced in the z direction; 22. a second planar portion; 23. a connecting rod; 24. the center scale mark of the clamping plate; 25. rough plane.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the invention, are within the scope of the invention.
Fig. 1 is a flowchart of a method for adjusting the center of mass of a head of an automobile crash dummy according to an embodiment of the present invention. The method is executed by mass center adjusting equipment for the head of the automobile collision dummy, the mass center adjusting equipment for the head of the automobile collision dummy comprises a clamping plate, a displacement adjusting device connected with the clamping plate, a balancing weight and a preset dummy head fixedly arranged, wherein the balancing weight comprises a first balancing weight and a second balancing weight, a first plane part is arranged on the right side inside the preset dummy head, a second plane part is arranged on the left side inside the preset dummy head, the first balancing weight and the second balancing weight are cuboid, the mass ratio of the first balancing weight to the second balancing weight is preset, the sum of the masses of the first balancing weight and the second balancing weight is determined by the actual mass and the theoretical mass of the preset dummy head, the size of the first balancing weight is determined by the size of the first plane part and the mass of the first balancing weight, and the size of the second balancing weight is determined by the size of the first balancing weight, the distance between the center of the first plane part and the center of the second plane part, and the equivalent mass coordinate of the balancing weight and the mass of the second balancing weight. Referring to fig. 1, the method specifically includes:
S110, clamping the first balancing weight by using the clamping plate so that the mass center position of the first balancing weight coincides with the mass center position of the displacement adjusting device;
s120, driving the clamping plate to move by utilizing the displacement adjusting device, so that the mass center of the first balancing weight is located at a first mass center coordinate, and one side, away from the clamping plate, of the first balancing weight is attached to the first plane part, wherein the first mass center coordinate is determined based on the distance from the center of the first plane part to the center of the second plane part, the thickness of the first balancing weight and the equivalent mass center coordinate of the balancing weight;
s130, removing the clamping plate after the first balancing weight is fixedly connected with the first plane part;
s140, clamping the second balancing weight by using the clamping plate so that the mass center position of the second balancing weight coincides with the mass center position of the displacement adjusting device;
s150, driving the clamping plate to move by utilizing the displacement adjusting device, so that the mass center of the second balancing weight is located at a second mass center coordinate, and one side, far away from the clamping plate, of the second balancing weight is attached to the second plane part, wherein the second mass center coordinate is determined based on the distance from the center of the first plane part to the center of the second plane part, the thickness of the second balancing weight and the equivalent mass center coordinate of the balancing weight;
And S160, removing the clamping plate after the second balancing weight is fixedly connected with the second plane part, and obtaining the preset dummy head with the adjusted mass center.
In this embodiment, the origin of the coordinate system corresponding to the first balancing weight, the second balancing weight, the displacement adjusting device and the preset dummy head is the same. The first plane portion and the second plane portion are protrusions on the inner side of the head of the dummy, respectively, and the protrusion surfaces may be approximately plane. Before clamping the first balancing weight by using the clamping plate, welding glue can be uniformly coated on the mounting surface (namely, the side far away from the clamping plate) of the first balancing weight, when the mass center of the first balancing weight is positioned at the first mass center coordinate, the first balancing weight is fixedly connected with the first plane part by using the welding glue, and similarly, before clamping the second balancing weight by using the clamping plate, welding glue can be uniformly coated on the mounting surface (namely, the side far away from the clamping plate) of the second balancing weight, and when the mass center of the second balancing weight is positioned at the second mass center coordinate, the second balancing weight is fixedly connected with the second plane part by using the welding glue. The centroid position of the preset dummy head is adjusted by adding the first balancing weight and the second balancing weight to the preset dummy head.
The embodiment has the following technical effects:
the balancing weights for adjusting the mass center are designed into the first balancing weight and the second balancing weight by combining the shape characteristics of the head of the automobile collision dummy, and are respectively placed on the left side and the right side of the head of the automobile collision dummy, so that the mass center adjusting cost is reduced, the structural complexity of mass center adjusting equipment is reduced, and meanwhile, the adjusting operation method is simplified; the first mass center coordinates and the second mass center coordinates of the first balancing weight and the second balancing weight are determined in advance based on the information such as the actual mass, the theoretical mass, the first balancing weight mass, the second balancing weight mass, the distance from the center of the first plane part to the center of the second plane part, the size of the first balancing weight, the size of the second balancing weight and the equivalent mass center coordinates of the balancing weight, and the accuracy of mass center adjustment of the head of the automobile collision dummy is improved by placing the first balancing weight and the second balancing weight at the positions matched with the corresponding mass center coordinates based on the mass center adjustment device for the head of the automobile collision dummy.
On the basis of the above embodiments, further, the apparatus for adjusting the center of mass of the head of the automobile crash dummy further includes a center of mass coordinate determination module, the method includes:
Based on the actual centroid coordinates, the actual mass, the theoretical centroid coordinates, the theoretical mass and the size of a first plane part of the preset dummy head, the centroid coordinates determining module is utilized to determine the first centroid coordinates of the first balancing weight and the second centroid coordinates of the second balancing weight in advance, wherein the first plane part and the second plane part are identical in shape and size;
specifically, based on the actual centroid coordinates, the actual mass, the theoretical centroid coordinates, the theoretical mass and the size of the first plane portion of the preset dummy head, the centroid coordinates determining module is utilized to determine the first centroid coordinates of the first balancing weight and the second centroid coordinates of the second balancing weight in advance, including:
determining the actual centroid coordinates of the preset dummy head
Figure SMS_1
；
Determining theoretical centroid coordinates of the preset dummy head
Figure SMS_2
；
Determining the actual quality of the head of the preset dummy
Figure SMS_3
；
Determining the theoretical mass of the head of the preset dummy
Figure SMS_4
；
Determining the mass of the balancing weight according to the actual mass and the theoretical mass
Figure SMS_5
；
Figure SMS_6
Calculating the equivalent centroid coordinates of the balancing weight according to a centroid moment balance equation
Figure SMS_7
；
Figure SMS_8
Wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure SMS_9
is the abscissa of the actual centroid coordinates, +. >
Figure SMS_14
Is the ordinate of the actual centroid coordinate, +.>
Figure SMS_16
Vertical coordinates, +.>
Figure SMS_11
Is the abscissa of the theoretical centroid coordinate, +.>
Figure SMS_13
Is the ordinate of the theoretical centroid coordinate, +.>
Figure SMS_15
Vertical coordinates, which are the theoretical centroid coordinates, +.>
Figure SMS_17
Is the abscissa, ++of the equivalent centroid coordinates>
Figure SMS_10
Is the ordinate of the equivalent centroid coordinate, +.>
Figure SMS_12
Vertical coordinates that are the equivalent centroid coordinates; the coordinate origins corresponding to the actual centroid coordinates, the theoretical centroid coordinates and the equivalent centroid coordinates are the same coordinate origins;
determining the mass of the first balancing weight
Figure SMS_18
And the mass of said second balancing weight +.>
Figure SMS_19
The preset mass ratio between the two is->
Figure SMS_20
；
Figure SMS_21
According to the length of the first plane part
Figure SMS_22
And width->
Figure SMS_23
Determining the length of the first balancing weight>
Figure SMS_24
Is->
Figure SMS_25
Width->
Figure SMS_26
Is->
Figure SMS_27
Wherein r is 2 As a first coefficient, r 3 Is a second coefficient;
determining the thickness of the first balancing weight according to the following formula
Figure SMS_28
；
Figure SMS_29
Wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure SMS_30
the density of the first balancing weight is the density of the first balancing weight, and the first balancing weight is a lead block;
in the x-axis direction, the distance from the mass center of the first balancing weight to the equivalent mass center of the balancing weight is
Figure SMS_31
The distance from the mass center of the second balancing weight to the equivalent mass center of the balancing weight is +. >
Figure SMS_32
Determining according to the moment balance principle in the x-axis directionL 2 =r 1 ×L 1 ；
The moment balance principle in the x-axis direction is as follows:
Figure SMS_33
the distance from the center of the first plane part to the center of the second plane part in the x-axis direction is
Figure SMS_34
Based on this, the thickness of the second balancing weight is determined using the following formula>
Figure SMS_35
：
Figure SMS_36
Figure SMS_37
Determining the length of the second balancing weight by using the following formula
Figure SMS_38
And width->
Figure SMS_39
Is the product of:
Figure SMS_40
wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure SMS_41
less than a preset length, < >>
Figure SMS_42
The second balancing weight is a lead block and is smaller than the preset width;
based on the thickness of the first balancing weight
Figure SMS_43
The thickness of the second balancing weight block>
Figure SMS_44
And the equivalent centroid coordinates of the balancing weights, determining the first centroid coordinates of the first balancing weight +.>
Figure SMS_45
And a second centroid coordinate of said second balancing weight +.>
Figure SMS_46
：/>
Figure SMS_47
Figure SMS_48
Wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure SMS_49
for the abscissa, < > of the first balancing weight>
Figure SMS_50
Is the ordinate of the first balancing weight, < >>
Figure SMS_51
For the vertical coordinate of the first balancing weight, < >>
Figure SMS_52
Is the abscissa, < > of the second balancing weight>
Figure SMS_53
Is the ordinate of the second balancing weight, < >>
Figure SMS_54
Is the vertical coordinate of the second balancing weight.
On the basis of the above embodiments, further, the method includes:
Figure SMS_56
the number of (2),>
Figure SMS_61
the value of (2) is 4/3, ">
Figure SMS_62
The value of (2) is 4/3, " >
Figure SMS_58
，
Figure SMS_60
，/>
Figure SMS_64
，/>
Figure SMS_66
，/>
Figure SMS_55
，
Figure SMS_63
The ordinate of the equivalent centroid coordinate +.>
Figure SMS_65
At->
Figure SMS_67
Projection points on a plane are on the second plane part and the first plane part, respectively, and the vertical coordinate of the equivalent centroid coordinate is +.>
Figure SMS_57
At->
Figure SMS_59
The projection points on the plane are on the second plane part and the first plane part respectively.
In this embodiment, the center of the first weight is preferably located on the first plane, and the first weight covers the first plane as much as possible, the center of the second weight is preferably located on the second plane, and the second weight covers the second plane as much as possible, so that it is preferable that
Figure SMS_70
The value of (2) is 4/3, ">
Figure SMS_72
The number of (2) is 4/3. In this embodiment, <' > a->
Figure SMS_74
，
Figure SMS_68
Is->
Figure SMS_71
，/>
Figure SMS_75
Is->
Figure SMS_76
，/>
Figure SMS_69
，/>
Figure SMS_73
。
On the basis of the above embodiments, further comprising:
if the first condition is met, determining that the head of the preset dummy does not meet the production and assembly requirements of the automobile collision dummy, and not needing to carry out mass center adjustment;
wherein the first condition includes an ordinate of the equivalent centroid coordinate
Figure SMS_77
At->
Figure SMS_80
The projected point on the plane is not on the ordinate of said equivalent centroid coordinates of said first plane section +.>
Figure SMS_82
At->
Figure SMS_79
The projection point on the plane is not on said second plane part, vertical coordinate of said equivalent centroid coordinates +. >
Figure SMS_81
At->
Figure SMS_83
The projected point on the plane is not on said first plane part and the vertical coordinate of said equivalent centroid coordinate +.>
Figure SMS_84
At->
Figure SMS_78
The projected points on the plane are not on at least one of the second plane parts.
The technical scheme of the embodiment is suitable for the situation that the mass of the head of the automobile collision dummy has small offset, the difference between the actual mass and the theoretical mass of the head of the automobile collision dummy is 100 g-500 g, and the actual mass of the head of the automobile collision dummy is smaller than the theoretical mass.
Fig. 2 is a schematic structural diagram of a device for adjusting the center of mass of a head of an automobile crash dummy according to an embodiment of the present invention, fig. 3 is a schematic structural diagram of a device for adjusting the center of mass of a head of an automobile crash dummy according to an embodiment of the present invention, fig. 4 is a schematic structural diagram of a displacement adjusting device according to an embodiment of the present invention, fig. 5 is a schematic structural diagram of a head of an automobile crash dummy according to an embodiment of the present invention, and fig. 6 is a front view of a head of an automobile crash dummy after a balancing weight is placed. The mass center adjusting device for the head of the automobile crash dummy is used for realizing the mass center adjusting method for the head of the automobile crash dummy according to the above embodiments, and comprises a preset dummy head 1, a fixed platform 5, a dummy head fixing device 4, a clamping device 14, a displacement adjusting device connected with the clamping device 14 and a balancing weight, wherein the balancing weight comprises a first balancing weight 12 and a second balancing weight, a first plane part is arranged on the right side inside the preset dummy head 1, a second plane part 22 is arranged on the left side inside the preset dummy head 1, the mass ratios of the first balancing weight 12 and the second balancing weight are cuboid, the sum of the masses of the first balancing weight 12 and the second balancing weight is determined by the actual mass and the theoretical mass of the preset dummy head 1, the size of the first balancing weight 12 is determined by the size of the first balancing weight 12, the size of the second balancing weight is determined by the size of the first balancing weight 12, the equivalent mass of the first plane part is the second plane part 22, and the equivalent mass of the second plane part is determined by the second equivalent mass of the center of the balancing weight 22, and the equivalent mass ratio of the second balancing weight is determined by:
The fixing platform 5 is used for fixing the dummy head fixing device 4 and the displacement adjusting device;
the dummy head fixture 4 is used for fixing the dummy head 1, and preferably, the dummy head fixture 4 fixes the dummy head 1 by inserting bolts into bolt holes 13 where the dummy head is connected with the dummy head fixture;
the clamping plate device 14 is used for clamping the first balancing weight 12, so that the mass center position of the first balancing weight 12 coincides with the mass center position of the displacement adjustment device;
the displacement adjustment device is used for driving the clamping plate device 14 to move, so that the mass center of the first balancing weight 12 is located at a first mass center coordinate, and one side of the first balancing weight 12 away from the clamping plate device 14 is fixedly connected with the first plane part, wherein the first mass center coordinate is determined based on the distance between the center of the first plane part and the center of the second plane part 22, the thickness of the first balancing weight 12 and the equivalent mass center coordinate of the balancing weight;
the clamping plate device 14 is further used for clamping the second balancing weight, so that the mass center position of the second balancing weight coincides with the mass center position of the displacement adjustment device;
the displacement adjusting device drives the clamping plate device 14 to move, so that the mass center of the second balancing weight is located at a second mass center coordinate, one side, away from the clamping plate device 14, of the second balancing weight is fixedly connected with the second plane portion 22, and the preset dummy head 1 with the mass center adjusted is obtained, wherein the origin of a coordinate system corresponding to the first mass center coordinate, the second mass center coordinate and the equivalent mass center coordinate is the circle center of the lower surface of the dummy head fixing device 4.
The embodiment has the following technical effects:
the balancing weights for adjusting the mass center are designed into the first balancing weight and the second balancing weight by combining the shape characteristics of the head of the automobile collision dummy, and are respectively placed on the left side and the right side of the head of the automobile collision dummy, so that the mass center adjusting cost is reduced, the structural complexity of mass center adjusting equipment is reduced, and meanwhile, the adjusting operation method is simplified; the first mass center coordinates and the second mass center coordinates of the first balancing weight and the second balancing weight are determined in advance based on the information such as the actual mass, the theoretical mass, the first balancing weight mass, the second balancing weight mass, the distance from the center of the first plane part to the center of the second plane part, the size of the first balancing weight, the size of the second balancing weight and the equivalent mass center coordinates of the balancing weight, and the accuracy of mass center adjustment of the head of the automobile collision dummy is improved by placing the first balancing weight and the second balancing weight at the positions matched with the corresponding mass center coordinates based on the mass center adjustment device for the head of the automobile collision dummy.
On the basis of the above embodiments, further, the displacement adjustment device includes an x-direction displacement adjustment device 9, a y-direction displacement adjustment device 10, a z-direction displacement adjustment device 8 and a connecting rod 23, the x-direction displacement adjustment device 9 includes an x-direction displacement adjustment slide rail and an x-direction displacement adjustment slide block embedded therein and capable of sliding, the x-direction displacement adjustment slide block is marked with an x-direction displacement scale line 19, the y-direction displacement adjustment device 10 includes a y-direction displacement adjustment slide rail and a y-direction displacement adjustment slide block embedded therein and capable of sliding, the y-direction displacement adjustment slide block is marked with a y-direction displacement scale line 20, the z-direction displacement adjustment device 8 includes a z-direction displacement adjustment slide rail and a z-direction displacement adjustment slide block embedded therein and capable of sliding, and the z-direction displacement adjustment slide block is marked with a z-direction displacement scale line 21, wherein:
The x-direction displacement adjusting device 9 is fixedly connected with the fixed platform 5 through the x-direction displacement adjusting sliding rail and is used for adjusting the barycenter abscissa of the displacement adjusting device based on the x-direction displacement scale line 19;
the y-direction displacement adjusting device 10 is fixedly connected with the x-direction displacement adjusting slide block through the y-direction displacement adjusting slide rail, and is used for adjusting the barycenter ordinate of the displacement adjusting device based on the y-direction displacement scale line 20;
the z-direction displacement adjusting device 8 is fixedly connected with the y-direction displacement adjusting sliding block through the z-direction displacement adjusting sliding rail and is used for adjusting the centroid vertical coordinate of the displacement adjusting device based on the z-direction displacement scale mark 21;
one end of the connecting rod 23, which is close to the displacement adjusting device, is connected with the z-direction displacement adjusting sliding block, and one end of the connecting rod, which is far away from the displacement adjusting device, is connected with the clamping plate device 14, and is used for driving the clamping plate device 14 to move.
In this embodiment, when the centroid position of the displacement adjustment device is located at the origin of the coordinate system, the scales corresponding to the x-direction displacement adjustment slider, the y-direction displacement adjustment slider, and the z-direction displacement adjustment slider are all 0 scale marks. Preferably, the connecting rod 23 is movably connected with the z-direction displacement adjustment slider, and can be rotated 180 ° to connect with the z-direction displacement adjustment slider, so as to meet the requirement of mounting the first balancing weight 12 on the first plane portion and mounting the second balancing weight on the second plane portion 22.
Further, in the above embodiments, the x-direction displacement adjustment device 9 is provided with an x-direction displacement adjustment knob 18, the y-direction displacement adjustment device 10 is provided with a y-direction displacement adjustment knob 17, and the z-direction displacement adjustment device 8 is provided with a z-direction displacement adjustment knob 15 and a z-direction displacement fixing knob 16, wherein:
the x-direction displacement adjusting knob 18 is used for adjusting the displacement of the x-direction displacement adjusting slide block through a worm and gear mechanism;
the y-direction displacement adjusting knob 17 is used for adjusting the displacement of the y-direction displacement adjusting slide block through a gear rack mechanism;
the z-direction displacement adjusting knob 15 is used for adjusting the displacement of the z-direction displacement adjusting slide block through a gear rack mechanism;
the z-direction displacement fixing knob 16 is used for fixing the z-direction displacement adjusting slider after the z-direction displacement adjusting knob 15 completes the displacement adjustment of the z-direction displacement adjusting slider.
On the basis of the above embodiments, further, one end of the x-direction displacement adjustment slider is provided with an x-direction displacement sensor 6, one end of the y-direction displacement adjustment slider is provided with a y-direction displacement sensor 11, one end of the z-direction displacement adjustment slider is provided with a z-direction displacement sensor 7, the fixed platform 5 is provided with a centroid coordinate display 2 and a centroid coordinate clear button 3, and the centroid coordinate display 2 is respectively connected with the x-direction displacement sensor 6, the y-direction displacement sensor 11 and the z-direction displacement sensor 7, wherein:
The x-direction displacement sensor 6 is used for measuring the barycenter abscissa of the displacement adjustment device;
the y-direction displacement sensor 11 is used for measuring the ordinate of the mass center of the displacement adjustment device;
the z-direction displacement sensor 7 is used for measuring the centroid vertical coordinate of the displacement adjustment device;
the centroid coordinate display 2 is configured to display, in real time, centroid coordinates of the displacement adjustment device according to measurement results of the x-direction displacement sensor 6, the y-direction displacement sensor 11 and the z-direction displacement sensor 7, where the centroid coordinates include the centroid abscissa, the centroid ordinate and the centroid ordinate;
the centroid coordinate clear button is used to clear the display result of the centroid coordinate display 2.
Before the clamping plate device 14 is used for clamping the first balancing weight or the second balancing weight, the centroid position of the displacement adjusting device is adjusted to be the origin of a coordinate system, at this time, scales corresponding to the x-direction displacement adjusting sliding block, the y-direction displacement adjusting sliding block and the z-direction displacement adjusting sliding block are all 0 scale marks, at this time, the indication number of the centroid coordinate display 2 is (0, 0), and if the indication number of the centroid coordinate display 2 is not (0, 0), the indication number of the centroid coordinate display 2 can be adjusted to be (0, 0) through a centroid coordinate clear button. It will be appreciated that, during reading, it is possible to observe in real time whether the centroid coordinate display 2 corresponds to the number of scales corresponding to the respective direction displacement adjustment sliders. In this embodiment, when the connecting rod 23 is rotated 180 °, the indication of the centroid coordinate display 2 needs to be readjusted, and therefore, the x-direction displacement graduation mark 19 includes 2 0 graduations.
On the basis of the above embodiments, further, the clamping plate device 14 includes two clamping plates disposed in opposite directions, a connecting portion connecting the two clamping plates, a spring is disposed in the connecting portion, and two clamping plates are respectively provided with a clamping plate center scale line 24 and a rough plane 25, wherein:
the two clamping plates clamp the first balancing weight 12 or the second balancing weight through the elasticity of the built-in spring, wherein the thickness center surfaces of the first balancing weight 12 and the second balancing weight are overlapped with the surface where the clamping plate center scale mark 24 is positioned, so that the mass center positions of the first balancing weight 12 and the second balancing weight are overlapped with the mass center position of the displacement adjusting device respectively;
the rough surface 25 is used to increase the friction between the two clamping plates and the first weight or the second weight.
Preferably, the centroid positions of the first balancing weight 12 and the second balancing weight are respectively on the center horizontal plane of the connecting rod, so that the centroid position is still on the center horizontal plane of the connecting rod 23 after the connecting rod 23 rotates 180 degrees. The two clamping plates in this embodiment have the same length when they clamp the respective weights.
On the basis of the above embodiments, the device further includes a centroid coordinate determining module, configured to determine, in advance, a first centroid coordinate of the first balancing weight 12 and a second centroid coordinate of the second balancing weight based on an actual centroid coordinate, an actual mass, a theoretical centroid coordinate, a theoretical mass, and a size of the first plane portion of the dummy head 1, where the shapes and sizes of the first plane portion and the second plane portion 22 are the same;
Specifically, based on the actual centroid coordinates, the actual mass, the theoretical centroid coordinates, the theoretical mass, and the size of the first plane portion of the preset dummy head 1, the first centroid coordinates of the first balancing weight 12 and the second centroid coordinates of the second balancing weight are predetermined, including:
determining the actual centroid coordinates of the preset dummy head
Figure SMS_85
；
Determining theoretical centroid coordinates of the preset dummy head
Figure SMS_86
；
Determining the actual quality of the head of the preset dummy
Figure SMS_87
；
Determining the theoretical mass of the head of the preset dummy
Figure SMS_88
；
Determining the mass of the balancing weight according to the actual mass and the theoretical mass
Figure SMS_89
；
Figure SMS_90
Calculating the equivalent centroid coordinates of the balancing weight according to a centroid moment balance equation
Figure SMS_91
；/>
Figure SMS_92
Wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure SMS_95
is the abscissa of the actual centroid coordinates, +.>
Figure SMS_98
Is the ordinate of the actual centroid coordinate, +.>
Figure SMS_100
Vertical coordinates, +.>
Figure SMS_93
Is the abscissa of the theoretical centroid coordinate, +.>
Figure SMS_97
Is the ordinate of the theoretical centroid coordinate, +.>
Figure SMS_99
Vertical coordinates, which are the theoretical centroid coordinates, +.>
Figure SMS_101
Is the abscissa, ++of the equivalent centroid coordinates>
Figure SMS_94
Is the ordinate of the equivalent centroid coordinate, +.>
Figure SMS_96
Vertical coordinates that are the equivalent centroid coordinates; the coordinate origins corresponding to the actual centroid coordinates, the theoretical centroid coordinates and the equivalent centroid coordinates are the same coordinate origins;
Determining the mass of the first balancing weight
Figure SMS_102
And the mass of said second balancing weight +.>
Figure SMS_103
The preset mass ratio between the two is->
Figure SMS_104
；
Figure SMS_105
According to the length of the first plane part
Figure SMS_106
And width->
Figure SMS_107
Determining the length of the first balancing weight>
Figure SMS_108
Is->
Figure SMS_109
Width->
Figure SMS_110
Is->
Figure SMS_111
Wherein r is 2 As a first coefficient, r 3 Is a second coefficient;
determining the thickness of the first balancing weight according to the following formula
Figure SMS_112
；
Figure SMS_113
Wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure SMS_114
the density of the first balancing weight is the density of the first balancing weight, and the first balancing weight is a lead block;
in the x-axis direction, the distance from the mass center of the first balancing weight to the equivalent mass center of the balancing weight is
Figure SMS_115
The distance from the mass center of the second balancing weight to the equivalent mass center of the balancing weight is +.>
Figure SMS_116
Determining according to the moment balance principle in the x-axis directionL 2 =r 1 ×L 1 ；
The moment balance principle in the x-axis direction is as follows:
Figure SMS_117
the distance from the center of the first plane part to the center of the second plane part 22 in the x-axis direction is
Figure SMS_118
Based on this, the thickness of the second balancing weight is determined using the following formula>
Figure SMS_119
：
Figure SMS_120
/>
Figure SMS_121
Determining the length of the second balancing weight by using the following formula
Figure SMS_122
And width->
Figure SMS_123
Is the product of:
Figure SMS_124
wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure SMS_125
less than a preset length, < >>
Figure SMS_126
The second balancing weight is a lead block and is smaller than the preset width;
based on the thickness of the first balancing weight
Figure SMS_127
The thickness of the second balancing weight block>
Figure SMS_128
And the equivalent centroid coordinates of the balancing weights, determining the first centroid coordinates of the first balancing weight +.>
Figure SMS_129
And a second centroid coordinate of said second balancing weight +.>
Figure SMS_130
：/>
Figure SMS_131
Figure SMS_132
Wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure SMS_133
for the abscissa, < > of the first balancing weight>
Figure SMS_134
Is the ordinate of the first balancing weight, < >>
Figure SMS_135
For the vertical coordinate of the first balancing weight, < >>
Figure SMS_136
Is the abscissa, < > of the second balancing weight>
Figure SMS_137
Is the ordinate of the second balancing weight, < >>
Figure SMS_138
Is the vertical coordinate of the second balancing weight.
The technical scheme of the method of the embodiment of the invention is further described in detail below by combining a Hybrid III dummy head model.
(1) The method comprises the steps of placing a preset dummy head 1 on a centroid measuring table, measuring the centroid of the preset dummy head 1 in the X, Y and Z directions, and measuring for a plurality of times to obtain centroid coordinates (-1.5, -37.5, 120.2) of the preset dummy head 1 by taking the rotation center O (0, 0) of the centroid measuring table as an origin, wherein the center coordinates (0, 80) of the lower surface of a dummy head fixing device 4 are the integral mass of the head is 4.24kg.
(2) After the barycenter coordinates (-1.5, -37.5, 120.2) of the preset dummy head 1 are converted into a coordinate system taking the center of the circle of the lower surface of the dummy head fixing device 4 as the origin, the actual barycenter coordinates
Figure SMS_139
(-1.5, -37.5, 40.2).
(3) Theoretical centroid coordinates through numerical model of head
Figure SMS_140
Is (0, -36.8, 39.0) and has a mass of 4.54kg.
(4) By the centroid moment balance equation:
Figure SMS_141
/>
obtaining the equivalent barycenter coordinates of the balancing weight
Figure SMS_142
Is (15.6, -26.9, 22.04). Ordinate +.>
Figure SMS_143
At->
Figure SMS_144
Projection points on a plane are on said second plane part 22 and said first plane part, respectively, and the vertical coordinate of said equivalent centroid coordinate +.>
Figure SMS_145
At->
Figure SMS_146
The projection points on the plane are required on the second plane part 22 and the first plane part, respectively.
(5) First balancing weight 12 and second balancing weight quality:
Figure SMS_147
(6) Thickness of the first weight 12
Figure SMS_148
：
Figure SMS_149
Wherein, the liquid crystal display device comprises a liquid crystal display device,a=39，b=33，ρ lead =11.3
Figure SMS_150
The method comprises the steps of carrying out a first treatment on the surface of the Then->
Figure SMS_151
Thus, the first weight 12 has a length of 52mm, a width of 44mm and a thickness of 7.73mm.
The first balancing weight 12 has the coordinates of
Figure SMS_152
Wherein
Figure SMS_153
；
In this embodiment, the equivalent centroid coordinates of the weights are located in the positive direction of the x-axis, and the mass of the first weight 12 is larger than that of the second weight, so that the first weight 12 is located at one side of the positive direction of the x-axis, and the first centroid coordinates of the first weight 12
Figure SMS_154
Is (49.54, -26.9, 22.04).
(7) Thickness of the second weight
Figure SMS_155
：
Figure SMS_156
/>
Wherein the method comprises the steps of
Figure SMS_157
Then->
Figure SMS_158
。
The length of the second balancing weight can be obtained
Figure SMS_159
And width->
Figure SMS_160
：
Figure SMS_161
Wherein the method comprises the steps of
Figure SMS_162
. In this embodiment the width of the second counter weight is preferably +.>
Figure SMS_163
Then->
Figure SMS_164
。
Thus, the second weight is 71mm in length, 55mm in width and 2.26mm in thickness.
The second mass center coordinate of the second balancing weight
Figure SMS_165
(-52.27, -26.9, 22.04), wherein>
Figure SMS_166
，/>
Figure SMS_167
。
(8) The dummy head 1 is fixed to the dummy head fixture 4 by bolts through bolt holes 13 where the dummy head is connected to the dummy head fixture.
(9) First, a first balancing weight 12 is installed and positioned on the right side of the head 1 of the preset dummy, namely in the positive direction of x, an x-direction displacement adjusting sliding block is arranged on a left 0 scale mark, and the indication of the barycenter coordinate display 2 is zeroed. The machined first balancing weight 12 is clamped on the clamping plate device 14, the thickness center surface of the first balancing weight 12 is coincident with the surface of the clamping plate center scale line 24, and the mass center position is required to be on the center horizontal plane of the connecting rod. The mounting surface of the first balancing weight 12 is evenly coated with welding glue. The three-way scale is adjusted to the (49.54, -26.9, 22.04) position. And after the balancing weight is firmly adhered, the clamping plate is taken down.
(10) And (3) installing a second balancing weight, rotating the connecting rod 23 by 180 degrees, wherein the second balancing weight is positioned at the left side of the head 1 of the preset dummy, namely in the negative direction of x, arranging the x-direction displacement adjusting sliding block on the right 0 scale mark, and zeroing the indication of the mass center coordinate display 2. The machined second balancing weight is clamped on the clamping plate device 14, the thickness center surface of the second balancing weight is coincident with the surface of the clamping plate center scale line 24, and the mass center position is required to be on the center horizontal plane of the connecting rod. And the second balancing weight mounting surface is uniformly coated with welding glue. The three directions are scaled to the (-52.27, -26.9, 22.04) position. And after the balancing weight is firmly adhered, the clamping plate is taken down.
(11) After the two balancing weights are completely firmly bonded, the preset dummy head 1 is placed on a mass center measuring table, mass centers in X, Y and Z directions of the collision dummy head are measured, mass center coordinates (0, -36.7, 39.2) of the dummy head taking the rotation center of the mass center measuring table as an origin of a coordinate system and the whole mass of the head are obtained through multiple measurements, after the mass center of the embodiment is adjusted, the deviation between the actual mass center coordinates of the preset dummy head 1 and the theoretical mass center coordinates is smaller than 1%, the deviation between the actual mass of the preset dummy head 1 and the theoretical mass is smaller than 0.5%, and the design requirement of the dummy head for automobile collision is met.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present application. As used in this specification, the terms "a," "an," "the," and/or "the" are not intended to be limiting, but rather are to be construed as covering the singular and the plural, unless the context clearly dictates otherwise. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method or apparatus comprising such elements.
It should also be noted that the positional or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention.

Claims (10)

1. A method for adjusting the mass center of a head of a car crash dummy, characterized in that the method is performed by a mass center adjusting device for a head of a car crash dummy, the mass center adjusting device for a head of a car crash dummy comprises a clamping plate, a displacement adjusting device connected with the clamping plate, a balancing weight and a preset dummy head fixedly arranged, wherein the balancing weight comprises a first balancing weight and a second balancing weight, a first plane part is arranged on the right side inside the preset dummy head, a second plane part is arranged on the left side inside the preset dummy head, the first balancing weight and the second balancing weight are cuboid, the mass ratio of the first balancing weight to the second balancing weight is the preset mass ratio, the sum of the masses of the first balancing weight and the second balancing weight is determined by the actual mass and the theoretical mass of the head of the preset dummy, the size of the first balancing weight is determined by the size of the first plane part and the mass of the first balancing weight, the size of the second balancing weight is determined by the size of the first balancing weight, the distance between the center of the first plane part and the center of the second plane part, the equivalent mass and the second coordinate mass comprises the mass center of the method:
Clamping the first balancing weight by using the clamping plate, so that the mass center position of the first balancing weight coincides with the mass center position of the displacement adjusting device;
the displacement adjusting device is utilized to drive the clamping plate to move, so that the mass center of the first balancing weight is located at a first mass center coordinate, one side, away from the clamping plate, of the first balancing weight is attached to the first plane part, and the first mass center coordinate is determined based on the distance between the center of the first plane part and the center of the second plane part, the thickness of the first balancing weight and the equivalent mass center coordinate of the balancing weight;
after the first balancing weight is fixedly connected with the first plane part, removing the clamping plate;
clamping the second balancing weight by using the clamping plate, so that the mass center position of the second balancing weight coincides with the mass center position of the displacement adjusting device;
the displacement adjusting device is utilized to drive the clamping plate to move, so that the mass center of the second balancing weight is located at a second mass center coordinate, one side, away from the clamping plate, of the second balancing weight is attached to the second plane part, and the second mass center coordinate is determined based on the distance between the center of the first plane part and the center of the second plane part, the thickness of the second balancing weight and the equivalent mass center coordinate of the balancing weight;
And removing the clamping plate after the second balancing weight is fixedly connected with the second plane part, so as to obtain the preset dummy head with the adjusted mass center.
2. The method for adjusting the centroid of a head of a car crash dummy according to claim 1, wherein the device for adjusting the centroid of a head of a car crash dummy further comprises a centroid coordinate determining module, the method comprising:
based on the actual centroid coordinates, the actual mass, the theoretical centroid coordinates, the theoretical mass and the size of a first plane part of the preset dummy head, the centroid coordinates determining module is utilized to determine the first centroid coordinates of the first balancing weight and the second centroid coordinates of the second balancing weight in advance, wherein the first plane part and the second plane part are identical in shape and size;
specifically, based on the actual centroid coordinates, the actual mass, the theoretical centroid coordinates, the theoretical mass and the size of the first plane portion of the preset dummy head, the centroid coordinates determining module is utilized to determine the first centroid coordinates of the first balancing weight and the second centroid coordinates of the second balancing weight in advance, including:
determining the actual centroid coordinates of the preset dummy head
Figure QLYQS_1
；
Determining theoretical centroid coordinates of the preset dummy head
Figure QLYQS_2
；
Determining the actual quality of the head of the preset dummy
Figure QLYQS_3
；
Determining the theoretical mass of the head of the preset dummy
Figure QLYQS_4
；
Determining the mass of the balancing weight according to the actual mass and the theoretical mass
Figure QLYQS_5
；
Figure QLYQS_6
Calculating the equivalent centroid coordinates of the balancing weight according to a centroid moment balance equation
Figure QLYQS_7
；
Figure QLYQS_8
Wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure QLYQS_11
is the abscissa of the actual centroid coordinates, +.>
Figure QLYQS_12
Is the ordinate of the actual centroid coordinate, +.>
Figure QLYQS_15
Vertical coordinates, +.>
Figure QLYQS_9
Is the abscissa of the theoretical centroid coordinate, +.>
Figure QLYQS_14
Is the ordinate of the theoretical centroid coordinate, +.>
Figure QLYQS_16
Vertical coordinates, which are the theoretical centroid coordinates, +.>
Figure QLYQS_17
Is the abscissa, ++of the equivalent centroid coordinates>
Figure QLYQS_10
Is the ordinate of the equivalent centroid coordinate, +.>
Figure QLYQS_13
Vertical coordinates that are the equivalent centroid coordinates; the coordinate origins corresponding to the actual centroid coordinates, the theoretical centroid coordinates and the equivalent centroid coordinates are the same coordinate origins;
determining the mass of the first balancing weight
Figure QLYQS_18
And the mass of said second balancing weight +.>
Figure QLYQS_19
The preset mass ratio is that
Figure QLYQS_20
；
Figure QLYQS_21
According to the length of the first plane part
Figure QLYQS_22
And width->
Figure QLYQS_23
Determining the length of the first balancing weight>
Figure QLYQS_24
Is->
Figure QLYQS_25
Wide, wide
Figure QLYQS_26
Is->
Figure QLYQS_27
Wherein r is 2 As a first coefficient, r 3 Is a second coefficient;
determining the thickness of the first balancing weight according to the following formula
Figure QLYQS_28
；
Figure QLYQS_29
Wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure QLYQS_30
the density of the first balancing weight is the density of the first balancing weight, and the first balancing weight is a lead block;
in the x-axis direction, the distance from the mass center of the first balancing weight to the equivalent mass center of the balancing weight is
Figure QLYQS_31
The distance from the mass center of the second balancing weight to the equivalent mass center of the balancing weight is +.>
Figure QLYQS_32
Determining according to the moment balance principle in the x-axis directionL 2 =r 1 ×L 1 ；
The moment balance principle in the x-axis direction is as follows:
Figure QLYQS_33
the distance from the center of the first plane part to the center of the second plane part in the x-axis direction is
Figure QLYQS_34
Based on this, the thickness of the second balancing weight is determined using the following formula>
Figure QLYQS_35
：
Figure QLYQS_36
Figure QLYQS_37
Determining the length of the second balancing weight by using the following formula
Figure QLYQS_38
And width->
Figure QLYQS_39
Is the product of:
Figure QLYQS_40
wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure QLYQS_41
less than a preset length, < >>
Figure QLYQS_42
The second balancing weight is a lead block and is smaller than the preset width;
based on the thickness of the first balancing weight
Figure QLYQS_43
The thickness of the second balancing weight block>
Figure QLYQS_44
And the equivalent centroid coordinates of the balancing weights, determining the first centroid coordinates of the first balancing weight +.>
Figure QLYQS_45
And a second centroid coordinate of said second balancing weight +.>
Figure QLYQS_46
：/>
Figure QLYQS_47
Figure QLYQS_48
Wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure QLYQS_49
for the abscissa, < > of the first balancing weight >
Figure QLYQS_50
Is the ordinate of the first balancing weight, < >>
Figure QLYQS_51
For the vertical coordinate of the first balancing weight, < >>
Figure QLYQS_52
For the second balancing weightIs, < >,>
Figure QLYQS_53
is the ordinate of the second balancing weight,
Figure QLYQS_54
Is the vertical coordinate of the second balancing weight.
3. The method for adjusting the centroid of a head of an automobile crash dummy according to claim 2, comprising:
Figure QLYQS_55
the number of (2),>
Figure QLYQS_61
the value of (2) is 4/3, ">
Figure QLYQS_63
The value of (2) is 4/3, ">
Figure QLYQS_56
，
Figure QLYQS_59
，/>
Figure QLYQS_64
，/>
Figure QLYQS_66
，/>
Figure QLYQS_58
，
Figure QLYQS_62
The ordinate of the equivalent centroid coordinate +.>
Figure QLYQS_65
At->
Figure QLYQS_67
Projection points on a plane are on the second plane part and the first plane part, respectively, and the vertical coordinate of the equivalent centroid coordinate is +.>
Figure QLYQS_57
At->
Figure QLYQS_60
The projection points on the plane are on the second plane part and the first plane part respectively.
4. The method for adjusting the centroid of a head of an automobile crash dummy according to claim 3, further comprising:
if the first condition is met, determining that the head of the preset dummy does not meet the production and assembly requirements of the automobile collision dummy, and not needing to carry out mass center adjustment;
wherein the first condition includes an ordinate of the equivalent centroid coordinate
Figure QLYQS_70
At->
Figure QLYQS_71
The projected point on the plane is not on the ordinate of said equivalent centroid coordinates of said first plane section +. >
Figure QLYQS_74
At->
Figure QLYQS_68
The projection point on the plane is not on said second plane part, vertical coordinate of said equivalent centroid coordinates +.>
Figure QLYQS_72
At->
Figure QLYQS_73
The projected point on the plane is not on said first plane part and the vertical coordinate of said equivalent centroid coordinate +.>
Figure QLYQS_75
At->
Figure QLYQS_69
The projected points on the plane are not on at least one of the second plane parts.
5. A head centroid adjustment device for a car crash dummy head according to any one of claims 1-4, characterized in that it comprises a pre-set dummy head (1), a fixed platform (5), a dummy head fixing device (4), a clamping device (14), a displacement adjustment device connected to the clamping device (14) and a weight, wherein the weight comprises a first weight (12) and a second weight, a first planar portion being provided on the right side inside the pre-set dummy head (1), a second planar portion (22) being provided on the left side inside the pre-set dummy head (1), the first weight (12) and the second weight being cuboid, the weight ratio of the first weight (12) and the second weight being a pre-set weight ratio, the sum of the weights of the first weight (12) and the second weight being determined by the actual and the theoretical weights of the pre-set dummy head (1), the first weight (12) being sized by the first planar portion and the first weight (12), the second weight (12) being sized by the first planar portion and the second weight (12) being sized by the second planar portion, the second weight (12) and the center of mass (2) being the equivalent to the center of mass:
The fixing platform (5) is used for fixing the dummy head fixing device (4) and the displacement adjusting device;
the dummy head fixing device (4) is used for fixing a preset dummy head (1);
the clamping plate device (14) is used for clamping the first balancing weight (12) so that the mass center position of the first balancing weight (12) coincides with the mass center position of the displacement adjusting device;
the displacement adjusting device is used for driving the clamping plate device (14) to move, so that the mass center of the first balancing weight (12) is located at a first mass center coordinate, one side, away from the clamping plate device (14), of the first balancing weight (12) is fixedly connected with the first plane part, and the first mass center coordinate is determined based on the distance from the center of the first plane part to the center of the second plane part (22), the thickness of the first balancing weight (12) and the equivalent mass center coordinate of the balancing weight;
the clamping plate device (14) is also used for clamping the second balancing weight so that the mass center position of the second balancing weight coincides with the mass center position of the displacement adjusting device;
the displacement adjusting device drives the clamping plate device (14) to move, so that the mass center of the second balancing weight is located at a second mass center coordinate, one side, away from the clamping plate device (14), of the second balancing weight is fixedly connected with the second plane part (22) to obtain a preset dummy head (1) with the mass center adjusted, and the origin of a coordinate system corresponding to the first mass center coordinate, the second mass center coordinate and the equivalent mass center coordinate is the center of the circle of the lower surface of the dummy head fixing device (4).
6. The apparatus of claim 5, wherein the displacement adjustment means comprises an x-direction displacement adjustment means (9), a y-direction displacement adjustment means (10), a z-direction displacement adjustment means (8) and a connecting rod (23), the x-direction displacement adjustment means (9) comprising an x-direction displacement adjustment slide and an x-direction displacement adjustment slide mounted therein and slidable, the x-direction displacement adjustment slide being marked with an x-direction displacement scale (19), the y-direction displacement adjustment means (10) comprising a y-direction displacement adjustment slide and a y-direction displacement adjustment slide mounted therein and slidable, the y-direction displacement adjustment slide being marked with a y-direction displacement scale (20), the z-direction displacement adjustment means (8) comprising a z-direction displacement adjustment slide and a z-direction displacement adjustment slide mounted therein and slidable, the z-direction displacement adjustment slide being marked with a z-direction displacement scale (21), wherein:
the x-direction displacement adjusting device (9) is fixedly connected with the fixed platform (5) through the x-direction displacement adjusting sliding rail and is used for adjusting the barycenter abscissa of the displacement adjusting device based on x-direction displacement scale marks (19);
the y-direction displacement adjusting device (10) is fixedly connected with the x-direction displacement adjusting sliding block through the y-direction displacement adjusting sliding rail and is used for adjusting the barycenter ordinate of the displacement adjusting device based on y-direction displacement scale marks (20);
The z-direction displacement adjusting device (8) is fixedly connected with the y-direction displacement adjusting sliding block through the z-direction displacement adjusting sliding rail and is used for adjusting the centroid vertical coordinate of the displacement adjusting device based on the z-direction displacement scale mark (21);
one end of the connecting rod (23) close to the displacement adjusting device is connected with the z-direction displacement adjusting sliding block, and one end far away from the displacement adjusting device is connected with the clamping plate device (14) and used for driving the clamping plate device (14) to move.
7. The apparatus according to claim 6, characterized in that the x-direction displacement adjustment device (9) is provided with an x-direction displacement adjustment knob (18), the y-direction displacement adjustment device (10) is provided with a y-direction displacement adjustment knob (17), the z-direction displacement adjustment device (8) is provided with a z-direction displacement adjustment knob (15) and a z-direction displacement fixation knob (16), wherein:
the x-direction displacement adjusting knob (18) is used for adjusting the displacement of the x-direction displacement adjusting slide block through a worm and gear mechanism;
the y-direction displacement adjusting knob (17) is used for adjusting the displacement of the y-direction displacement adjusting sliding block through a gear rack mechanism;
the z-direction displacement adjusting knob (15) is used for adjusting the displacement of the z-direction displacement adjusting slide block through a gear rack mechanism;
The z-direction displacement fixing knob (16) is used for fixing the z-direction displacement adjusting slide block after the z-direction displacement adjusting knob (15) completes the displacement adjustment of the z-direction displacement adjusting slide block.
8. The apparatus according to claim 6 or 7, wherein one end of the x-direction displacement adjustment slider is provided with an x-direction displacement sensor (6), one end of the y-direction displacement adjustment slider is provided with a y-direction displacement sensor (11), one end of the z-direction displacement adjustment slider is provided with a z-direction displacement sensor (7), a fixed platform (5) is provided with a centroid coordinate display (2) and a centroid coordinate clear button (3), and the centroid coordinate display (2) is connected with the x-direction displacement sensor (6), the y-direction displacement sensor (11) and the z-direction displacement sensor (7), respectively, wherein:
an x-direction displacement sensor (6) is used for measuring the barycenter abscissa of the displacement adjustment device;
the y-direction displacement sensor (11) is used for measuring the ordinate of the mass center of the displacement adjustment device;
the z-direction displacement sensor (7) is used for measuring the centroid vertical coordinate of the displacement adjustment device;
the centroid coordinate display (2) is used for displaying centroid coordinates of the displacement adjustment device in real time according to measurement results of the x-direction displacement sensor (6), the y-direction displacement sensor (11) and the z-direction displacement sensor (7), wherein the centroid coordinates comprise the centroid abscissa, the centroid ordinate and the centroid ordinate;
The centroid coordinate zero clearing button is used for clearing the display result of the centroid coordinate display (2).
9. The apparatus according to claim 6 or 7, characterized in that the clamping plate arrangement (14) comprises two clamping plates arranged opposite each other, a connecting part connecting the two clamping plates, a spring being arranged in the connecting part, the two clamping plates being provided with a clamping plate center graduation mark (24) and a roughened surface (25), respectively, wherein:
the two clamping plates clamp the first balancing weight (12) or the second balancing weight through the elasticity of the built-in spring, wherein the thickness center surfaces of the first balancing weight (12) and the second balancing weight are overlapped with the surfaces of the clamping plate center graduation marks (24), so that the mass center positions of the first balancing weight (12) and the second balancing weight are overlapped with the mass center position of the displacement adjusting device respectively;
the rough plane (25) is used for increasing friction between the two clamping plates and the first balancing weight or the second balancing weight.
10. The apparatus according to claim 5, further comprising a centroid coordinate determination module for determining in advance a first centroid coordinate of a first balancing weight (12) and a second centroid coordinate of the second balancing weight based on an actual centroid coordinate, an actual mass, a theoretical centroid coordinate, a theoretical mass and a size of a first planar portion of a preset dummy head (1), wherein the shape and the size of the first planar portion and the second planar portion (22) are the same;
Specifically, based on the actual centroid coordinates, the actual mass, the theoretical centroid coordinates, the theoretical mass and the size of the first plane part of the preset dummy head (1), the first centroid coordinates of the first balancing weight (12) and the second centroid coordinates of the second balancing weight are predetermined, and the method comprises the following steps:
determining the actual centroid coordinates of the preset dummy head
Figure QLYQS_76
；
Determining theoretical centroid coordinates of the preset dummy head
Figure QLYQS_77
；
Determining the actual quality of the head of the preset dummy
Figure QLYQS_78
；
Determining the theoretical mass of the head of the preset dummy
Figure QLYQS_79
；
Determining the mass of the balancing weight according to the actual mass and the theoretical mass
Figure QLYQS_80
；
Figure QLYQS_81
Calculating the equivalent centroid coordinates of the balancing weight according to a centroid moment balance equation
Figure QLYQS_82
；
Figure QLYQS_83
Wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure QLYQS_85
is the abscissa of the actual centroid coordinates, +.>
Figure QLYQS_89
Is the ordinate of the actual centroid coordinate, +.>
Figure QLYQS_91
Vertical coordinates, +.>
Figure QLYQS_86
Is the abscissa of the theoretical centroid coordinate, +.>
Figure QLYQS_87
Is the ordinate of the theoretical centroid coordinate, +.>
Figure QLYQS_90
Vertical coordinates, which are the theoretical centroid coordinates, +.>
Figure QLYQS_92
Is the abscissa, ++of the equivalent centroid coordinates>
Figure QLYQS_84
Is the ordinate of the equivalent centroid coordinate, +.>
Figure QLYQS_88
Vertical coordinates that are the equivalent centroid coordinates; the coordinate origins corresponding to the actual centroid coordinates, the theoretical centroid coordinates and the equivalent centroid coordinates are the same coordinate origins;
Determining the mass of the first balancing weight
Figure QLYQS_93
And the mass of said second balancing weight +.>
Figure QLYQS_94
The preset mass ratio is that
Figure QLYQS_95
；
Figure QLYQS_96
According to the length of the first plane part
Figure QLYQS_97
And width->
Figure QLYQS_98
Determining the length of the first balancing weight>
Figure QLYQS_99
Is->
Figure QLYQS_100
Wide, wide
Figure QLYQS_101
Is->
Figure QLYQS_102
Wherein r is 2 As a first coefficient, r 3 Is a second coefficient;
determining the thickness of the first balancing weight according to the following formula
Figure QLYQS_103
；
Figure QLYQS_104
Wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure QLYQS_105
the density of the first balancing weight is the density of the first balancing weight, and the first balancing weight is a lead block;
in the x-axis direction, the distance from the mass center of the first balancing weight to the equivalent mass center of the balancing weight is
Figure QLYQS_106
The distance from the mass center of the second balancing weight to the equivalent mass center of the balancing weight is +.>
Figure QLYQS_107
Determining according to the moment balance principle in the x-axis directionL 2 =r 1 ×L 1 ；
The moment balance principle in the x-axis direction is as follows:
Figure QLYQS_108
the distance from the center of the first plane part to the center of the second plane part (22) is in the x-axis direction
Figure QLYQS_109
Based on this, the thickness of the second balancing weight is determined using the following formula>
Figure QLYQS_110
：
Figure QLYQS_111
Figure QLYQS_112
Determining the length of the second balancing weight by using the following formula
Figure QLYQS_113
And width->
Figure QLYQS_114
Is the product of:
Figure QLYQS_115
wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure QLYQS_116
less than a preset length, < >>
Figure QLYQS_117
The second balancing weight is a lead block and is smaller than the preset width;
based on the thickness of the first balancing weight
Figure QLYQS_118
The thickness of the second balancing weight block>
Figure QLYQS_119
And the equivalent centroid coordinates of the balancing weights, determining the first centroid coordinates of the first balancing weight +.>
Figure QLYQS_120
And a second centroid coordinate of said second balancing weight +.>
Figure QLYQS_121
：/>
Figure QLYQS_122
Figure QLYQS_123
Wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure QLYQS_124
for the abscissa, < > of the first balancing weight>
Figure QLYQS_125
Is the ordinate of the first balancing weight, < >>
Figure QLYQS_126
For the vertical coordinate of the first balancing weight, < >>
Figure QLYQS_127
Is the abscissa, < > of the second balancing weight>
Figure QLYQS_128
Is the ordinate of the second balancing weight,
Figure QLYQS_129
Is the vertical coordinate of the second balancing weight.
CN202310354428.5A 2023-04-06 2023-04-06 Method and device for adjusting head mass center of automobile collision dummy Active CN116106036B (en)

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