A device and method for calibrating a lumbar spine of an aviation dummy

Abstract

The application relates to the technical field of dummy calibration, in particular to a device and a method for calibrating the lumbar vertebrae of an aviation dummy. The device comprises a pull-out type spine box tool and a chassis; the chassis is used for connecting the lumbar vertebrae to be calibrated and the spine box tool; when the spine box tool is pulled to different heights along a direction perpendicular to the horizontal plane, the spine box tool is used for simulating the height of the upper part of the lumbar vertebrae; different direction holes are arranged on the spine box tool, and counterweights are inserted into the holes to simulate the mass and the center of mass position of the upper part of the lumbar vertebrae. The application provides a device which is logically reasonable, simple to operate, highly economic and applicable, and meets the requirements of replacing the component, adjusting the center of mass and the like at the present stage, so that the lumbar vertebrae of the dummy can be replaced by a simple device, a device can be used for calibrating various types of dummy of various models, the lumbar vertebrae calibration process is simplified, and the rationality in the lumbar vertebrae calibration experiment can still be ensured.

Description

Technical Field

[0001] This application relates to the field of dummy calibration technology, and more specifically, to a device and method for calibrating the lumbar spine of an aviation dummy. Background Technology

[0002] Calibration of crash dummies is a rigorous process that uses data from various sensors on the dummy to determine if a location meets regulatory requirements. Aviation crash dummies explicitly require the lumbar spine to be straight, not curved as in traditional car crash dummies, because the physical quantities measured differ in direction; aviation dummies primarily measure vertical quantities. Lumbar spine calibration tests mainly include static and dynamic calibration. Static measurements primarily involve axial compression and bending tests, while dynamic measurements involve impacting the lumbar spine at 5-15 m / s to analyze force-time curves and other data. During calibration, the upper torso needs to be manually pushed, and the angle at which the upper torso returns to its upright position after the force is withdrawn is observed to determine if the lumbar spine meets regulations. Due to the significant mass of the upper torso, head, and neck, connecting the upper torso to the lumbar spine is difficult, and the mass of the upper torso, head, and neck varies between different dummies, making the operation extremely challenging. Furthermore, lumbar spine calibration requires the entire dummy to be properly assembled and placed on a table, without any disassembly or assembly, thus significantly reducing testing efficiency. After the lumbar spine is calibrated, the dummy needs to be removed from the seat, and all components above the lumbar spine need to be disassembled and replaced. The replaced dummy needs to be repositioned and the seat needs to be repositioned, which increases the difficulty of the experiment.

[0003] In summary, the lumbar spine calibration process for dummies is overly cumbersome, requiring significant time and manpower for calibration of different dummies, thus reducing the company's economic benefits. Therefore, this application is submitted. Summary of the Invention

[0004] The purpose of this application is to provide a device and method for calibrating the lumbar spine of an aviation dummy. This device is logically sound, simple to operate, economically applicable, and meets the current requirements for component replacement and center of gravity adjustment. It allows the lumbar spine and above of the dummy to be replaced by a simple device, enabling one device to calibrate multiple models and types of dummies, simplifying the lumbar spine calibration process. At the same time, it still ensures the rationality of the lumbar spine calibration experiment.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] In one aspect, this application provides a device for lumbar spine calibration of an aircraft dummy, comprising: a pull-out spine box fixture and a chassis;

[0007] The chassis is used to connect the lumbar vertebrae and spine box tooling to be calibrated;

[0008] The spine box tooling is pulled to different heights in a direction perpendicular to the horizontal plane to simulate the height of the upper part of the lumbar vertebrae.

[0009] The spine box tooling is provided with holes in different directions, and the mass and center of mass position of the upper part of the lumbar vertebrae are simulated by inserting counterweights in the holes.

[0010] In a second aspect, the application provides a calibration method for the lumbar vertebrae of an aviation dummy, which adopts the calibration device for the lumbar vertebrae of an aviation dummy provided in the first aspect.

[0011] The method comprises:

[0012] The spine box tooling is installed on the lumbar vertebrae to be calibrated through the base plate;

[0013] The reference height, reference mass and reference center of mass position of the upper part of the lumbar vertebrae of the reference dummy are obtained;

[0014] The spine box tooling is pulled to make the height of the upper part of the lumbar vertebrae consistent with the reference height;

[0015] Counterweights are inserted into the holes of the spine box tooling to make the mass of the upper part of the lumbar vertebrae consistent with the reference mass, and the center of mass position of the upper part of the lumbar vertebrae consistent with the reference center of mass position.

[0016] Compared with the prior art, the application has the following beneficial effects:

[0017] The application improves the cumbersome steps of disassembling the dummy and calibrating the tooling in the lumbar vertebrae calibration process of the conventional dummy. For the size and mass parameters of the upper torso, head and neck of different dummy models, the application meets the lumbar vertebrae calibration requirements of different dummy models through a device, reducing the trouble of carrying and assembling the dummy. The holes in different directions reserved in the tooling can realize the center of mass control capability. Based on the incremental pulling scheme of the 5th dummy reference, the application can be upgraded to other dummy parameters by only adding counterweights, greatly shortening the adjustment time and significantly reducing the risk of human error. Compared with the imported customized tooling, the manufacturing cost is greatly reduced and the maintenance is convenient. The height adjustment idea of the pulling type can also be applied to the automotive crash dummy, expanding the application field and providing a convenient and reliable technical solution for standardized calibration. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the application, the drawings needed in the specific embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0019] Figure 1 is a structural schematic diagram of a device for calibrating a lumbar vertebra of an aviation dummy provided by an embodiment of the present application;

[0020] Figure 2 is another structural schematic diagram of a device for calibrating a lumbar vertebra of an aviation dummy provided by an embodiment of the present application;

[0021] Figure 3 is a structural schematic diagram of a spine box tooling in a fully retracted state provided by an embodiment of the present application;

[0022] Figure 4 is a structural schematic diagram of a chassis provided by an embodiment of the present application;

[0023] Figure 5 is a flowchart of a method for calibrating a lumbar vertebra of an aviation dummy provided by an embodiment of the present application;

[0024] Figure 6 is a diagram of the quality and height of the spine box tooling and the chassis provided by an embodiment of the present application;

[0025] Figure 7 is a front view of the spine box tooling and the chassis provided by an embodiment of the present application;

[0026] Figure 8 is a front view of the spine box tooling and the chassis after the first and second counterweights are inserted provided by an embodiment of the present application;

[0027] wherein 1 is the spine box tooling, 2 is the chassis, 3 is the lumbar vertebra, 4 is the experimental table top, 11 is the pulling device, 12 is the force applying device, 13 is the outer layer nested structure, 14 is the middle layer nested structure, 15 is the innermost layer nested structure, 16 is the first hole, 17 is the second hole, 18 is the guide rail, 21 is the round hole, 22 is the groove, and 5 is the second counterweight. DETAILED DESCRIPTION

[0028] The exemplary embodiments of the present application will be described hereinafter with reference to the accompanying drawings, in which various details of the embodiments of the present application are set forth to assist in understanding the present application. It should be apparent to those skilled in the art that the embodiments described herein can be practiced without such details. In other instances, well-known structures and functions have not been described in detail in order to not obscure the understanding of this description.

[0029] The present application will be further described in detail below with reference to the embodiments.

[0030] Figure 1 is a structural schematic diagram of a device for calibrating a lumbar vertebra of an aviation dummy provided by an embodiment of the present application, Figure 2Figure 2 is another structural schematic diagram of the device for calibrating the lumbar spine of an aviation dummy provided in the embodiments of the present application, referring to Figure 1 and Figure 2 The device comprises a pull-out type spine box tool 1 and a base plate 2.

[0031] The lumbar spine 3 to be calibrated is placed on the tabletop 4, and the base plate 2 is used to connect the lumbar spine 3 to be calibrated and the spine box tool 1. The spine box tool 1 has guide rails 18 at the bottom for connecting with the base plate 2, improving the convenience of connection. When the spine box tool 1 is pulled out to different heights along the direction perpendicular to the horizontal plane, it is used to simulate the height of the upper part of the lumbar spine 3. Figure 1 and Figure 2 In the above, the spine box tool 1 is a multi-layer nested structure in the shape of a cuboid; the height of the multi-layer nested structure decreases in the order of being pulled out from inside to outside. The multi-layer nested structure comprises one outer nested structure 13 and two inner nested structures (which can be referred to as the innermost nested structure 15 and the middle nested structure 14).

[0032] Referring to Figure 3 When the spine box tool 1 is in the fully retracted state, both of the two inner nested structures are located in the outer nested structure, at which time the total height of the base plate and the spine box tool is used to simulate the height of the upper part of the 5th dummy lumbar spine (including the head, neck and upper torso). After pulling out the innermost nested structure, the middle nested structure 14 is still located in the outer nested structure 13, at which time the total height of the base plate 2, the outer nested structure 13 and the innermost nested structure 15 is used to simulate the height of the upper part of the 50th dummy lumbar spine (including the head, neck and upper torso). After continuing to pull out the middle nested structure 14, the spine box tool 1 is fully stretched, at which time the total height of the base plate 2, the outer nested structure 13, the middle nested structure 14 and the innermost nested structure 15 is used to simulate the height of the upper part of the 95th dummy lumbar spine (including the head, neck and upper torso).

[0033] Different direction holes are provided on the spine box tool 1, and by inserting the counterweight blocks in the holes, the mass and the center of mass position of the upper part of the lumbar spine are simulated. Since the counterweight blocks have a certain mass, the counterweight blocks inserted into the spine box tool 1 will become part of the spine box tool 1, increasing the mass of the spine box tool 1. The position of the counterweight blocks inserted will also affect the center of mass position of the entire spine box tool 1.

[0034] Figure 4 Figure 3 is a structural schematic diagram of the base plate provided in the embodiments of the present application. The round hole 21 on the base plate 2 is the reserved position for the lumbar spine, realizing the fixed connection of the lumbar spine 3 and the spine box tool 1. The groove 22 on the base plate 2 cooperates with the guide rails 18 to realize the installation of the spine box tool 1.

[0035] The present application improves the traditional dummy in the lumbar spine calibration process, which needs to disassemble the dummy and the cumbersome steps of the calibration tool. For the size, mass and other parameters of the upper torso, head and neck of different dummy models, the present application meets the lumbar spine calibration requirements of different models and sizes through a device, reducing the trouble of carrying and disassembling the dummy. The holes in different directions reserved in the spine box tool 1 can realize the control ability of the center of mass. Based on the incremental pulling scheme of the 5th dummy reference, only additional weight blocks are needed to upgrade to other dummy parameters, the adjustment time is greatly shortened, and the risk of human error is significantly reduced. Compared with the imported customized tool, the manufacturing cost is greatly reduced and the maintenance is convenient, and the height adjustment of the pulling type can also be applied to the automotive crash dummy, expanding the application field and providing a convenient and reliable technical solution for standardized calibration.

[0036] In a specific embodiment, for the convenience of description and operation, a three-dimensional coordinate system (indicated by a red line) is constructed at the bottom of the chassis 2, the z-axis is vertical, indicating the height; the x-axis is the left-right direction in the dummy's view, indicating the length, and the spine box tool 1 and the chassis 2 are left-right symmetrical; the y-axis is the front-back direction in the dummy's view, indicating the width. Referring to Figure 1 , the origin (red dot) of the three-dimensional coordinate system is located at the midpoint of the length direction edge of the chassis bottom.

[0037] Continuing to refer to Figure 2 , the first hole 16 is arranged at the side center position of the two inner nested structures of the spine box tool 1; the second hole 17 is arranged at the position close to the chassis 2 on the outer nested structure 13 of the spine box tool 1. The weight block is a cylinder with the same diameter as the first hole 16 and the second hole 17. The first hole 16 is mainly used to adjust the vertical center of mass position, and the second hole 17 is mainly used to adjust the horizontal center of mass position, wherein the x-direction second hole 17 is used to adjust the x-direction center of mass position, and the y-direction second hole 17 is used to adjust the y-direction center of mass position. Optionally, the depth of the hole is 100mm, which can penetrate through the entire spine box tool 1.

[0038] Continuing to refer to Figure 1 and Figure 2 , the pulling device 11 is arranged at the top center position of the spine box tool 1, which is a 1cm cube. A person can easily pull the inner nested structure in and out by pinching the pulling device 11, realizing the height adjustment of the spine box tool 1. The force applying device 12 is arranged on the side of each nested structure, which is also a 1cm cube, and is used to apply force to the spine box tool 1 through the force applying device 12, so as to simulate the dynamic measurement scene of the force on the upper part of the lumbar spine 3.

[0039] Figure 5is a flowchart of a calibration method of an aviation dummy lumbar vertebra provided by an embodiment of the present application. The embodiment adopts the lumbar vertebra calibration device of the above embodiment to simulate the height, mass and center of mass position of the upper part of the lumbar vertebra 3 by means of the spine box tooling 1, so as to realize the calibration of the lumbar vertebra. Referring to Figure 5 The method provided by the embodiment includes the following steps.

[0040] S110, the spine box tooling is installed on the lumbar vertebra to be calibrated through the chassis.

[0041] First, according to the calibration requirements, prepare the experimental table top, the lumbar vertebra to be calibrated, the spine box tooling, the chassis and the reference dummy. Among them, the reference dummy is the dummy that needs to be simulated by the embodiment, that is, the mass, center of mass position and height of the reference dummy are simulated by adjusting the spine box tooling. The reference dummy can be a 5th (5th percentile) dummy, a 50th (50th percentile) dummy and a 95th (95th percentile) dummy.

[0042] Then, install the lower part of the dummy lumbar vertebra (including legs, feet, etc.), and connect the lumbar vertebra and the chassis with bolts, so that the chassis on the lumbar vertebra can support the spine box tooling.

[0043] Finally, install the spine box tooling on the chassis.

[0044] S120, obtain the reference height, reference mass and reference center of mass position of the upper part of the lumbar vertebra of the reference dummy.

[0045] S130, pull the spine box tooling so that the height of the upper part of the lumbar vertebra is consistent with the reference height.

[0046] S140, insert the counterweight into the hole of the spine box tooling, so that the mass of the upper part of the lumbar vertebra is consistent with the reference mass, and the center of mass position of the upper part of the lumbar vertebra is consistent with the reference center of mass position.

[0047] The upper part of the lumbar vertebra of the reference dummy includes the upper torso, neck and head, etc. In actual application, the reference height, reference mass and reference center of mass position of the upper part of the lumbar vertebra of the reference dummy should be calculated first, which will be used as a reference value to guide the adjustment of the spine box tooling.

[0048] Optionally, the reference center of mass position of the upper part of the lumbar vertebra of the reference dummy (a three-dimensional coordinate point) is obtained by using a suspension method or a center of mass measuring instrument. For the suspension method, the upper part of the lumbar vertebra is suspended on a fixed fulcrum through a point (for example, a certain firm connection point of the head), and it is ensured that the upper part of the lumbar vertebra can swing freely and stably and then be stationary. After the upper part of the lumbar vertebra is completely stationary, a plumb line L1 passing through the suspension point is drawn on the background board behind the upper part of the lumbar vertebra by using a weight (or a laser plummet). At this time, the overall center of mass is necessarily at a certain point on the line L1. The second plumb line L2 is drawn by changing the suspension point. In the three-dimensional space, two non-parallel straight lines intersect at a point, and the point is the center of mass of the entire upper part of the lumbar vertebra. In actual operation, it is usually necessary to take pictures or measurements from at least two directions (such as the side and the front), and draw two lines on the same drawing or three-dimensional model. The intersection of the two lines is the position of the center of mass.

[0049] The total mass of the upper part of the lumbar vertebra of the reference dummy, that is, the reference mass, is measured by using a weighing instrument. The reference dummy is placed on the experimental table, and the height of the upper part of the lumbar vertebra of the reference dummy, that is, the reference height, is measured by using a ruler.

[0050] After obtaining the reference height, the reference mass, and the reference center of mass position, when the dummy of the same model is calibrated for the lumbar vertebra, or the lumbar vertebra is replaced for continuous experiments, the same mass can be used to replace all the parts above the lumbar vertebra. When the dummies of different models are calibrated for the lumbar vertebra, the spine box tooling is pulled according to the reference height, so that the height of the upper part of the lumbar vertebra is consistent with the reference height. The counterweight is inserted into the hole (including the first hole and the second hole) of the spine box tooling, so that the mass of the upper part of the lumbar vertebra is consistent with the reference mass, the center of mass position of the upper part of the lumbar vertebra is consistent with the reference center of mass position, and the steps for replacing the lumbar vertebra are simplified.

[0051] It should be noted that the "consistency" in the present embodiment does not require the numerical values to be exactly the same, and a certain error is allowed, for example, within an error range of 5 mm, the data is considered consistent.

[0052] When the spine box tooling is in a completely retracted state, only the outer nested structure is exposed, and the height and mass of the spine box tooling and the chassis together are the standard of the 5th dummy, and the size (length x width x height) is 250 mm x 100 mm x 550 mm. The center of mass of the upper part of the lumbar vertebra of the 5th dummy, that is, the center of mass position (x-y-z) of the tooling together with the chassis in the non-pulled state, is (0 mm, 27 mm, 326 mm). The total mass of the spine box tooling is 22 kg, the mass of the outer nested structure is 20 kg, the mass of the middle nested structure is 1 kg, and the mass of the innermost nested structure is 1 kg. The height of the chassis is 100 mm, and the mass is 1 kg.

[0053] The reference dummy is a 50th dummy, the reference height is 650 mm, the vertical (z-direction) center of mass positions of the head, neck and upper torso of the 50th dummy are 750 mm, 650 mm and 330 mm respectively, and the width direction (y-direction) center of mass positions of the head, neck and upper torso of the 50th dummy are 50 mm, 55 mm and 50 mm respectively. The masses of the head, neck and upper torso of the 50th dummy are 2.5 kg, 1 kg and 30 kg respectively.

[0054] It can be seen that the 50th dummy is 100 mm higher than the 5th dummy, so the innermost nested structure 15 in the spine box tooling is pulled out, as shown in Figure 6 , and the middle nested structure 14 (indicated by a dashed line) is retracted into the spine box tooling 1. At this time, the total height of the spine box tooling 1 and the chassis 2 is 650 mm, which is consistent with the reference height of the reference dummy.

[0055] At present, as shown in Figure 6 , the total mass of the spine box tooling 1 and the chassis 2 is 22 kg + 1 kg = 23 kg. The total mass of the head, neck and upper torso of the 50th dummy is 2.5 kg + 1 kg + 30 kg = 33.5 kg, and the total mass that needs to be compensated (i.e. the total mass of the weight blocks needed to be inserted) is 33.5 kg - 23 kg = 10.5 kg.

[0056] In order to facilitate the adjustment of the mass, the weight blocks in the embodiments of the present application are steel blocks, and the following formula is used:

[0057] Formula (1)

[0058] Wherein, m is the mass of the weight block, is the density of the weight block, and z is the length of the weight block. The length of the weight block is controlled to control the size of the mass of the weight block. It is assumed that the density of the weight block is uniform and the center of mass is located at the center position of the weight block.

[0059] The following will describe in detail how many weight blocks are inserted and where the weight blocks are inserted to achieve the consistency of the reference mass and the consistency of the reference center of mass position.

[0060] First step: insert the first weight block in the hole of the innermost nested structure to make the vertical center of mass position above the lumbar spine consistent with the reference vertical center of mass position.

[0061] First, place the reference dummy (i.e. the 50th dummy) in an upright state on the desktop, and calculate the reference vertical center of mass position and the reference horizontal center of mass position of the upright reference dummy according to the multi-rigid-body system center of mass calculation method:

[0062] Formula (2)

[0063] Equation (3)

[0064] wherein, , , are the mass of the head, neck, upper torso of the 50th dummy, respectively, , , are the vertical center of mass positions of the head, neck, upper torso of the 50th dummy, respectively. , , are the width direction (y direction) center of mass positions of the head, neck, upper torso of the 50th dummy, respectively. , are the reference vertical center of mass position and the reference horizontal center of mass position of the upright reference dummy. The mass and the center of mass positions of the head, neck, upper torso of the 50th dummy are brought into Equation (2) and Equation (3) to obtain Equation (4) and Equation (5):

[0065] Equation (4)

[0066] Equation (5)

[0067] Since the reference dummy is left-right symmetrical, the center of mass position of the part above the lumbar vertebrae in the length direction (x direction) is 0, i.e. x c = 0. The center of mass of all the weight blocks inserted subsequently should be consistent with the reference center of mass position.

[0068] First, the lumbar vertebrae and the tooling are kept in a horizontal-vertical state, and the vertical center of mass position is made consistent by inserting a weight block (referred to as a first weight block) into the hole of the innermost nested structure. It is assumed that the mass of the first weight block is X1, and the following equation exists:

[0069] Equation (6)

[0070] wherein, is the vertical center of mass position of the tooling and the chassis as a whole after the first weight block is inserted, i.e. the vertical center of mass position of the part above the lumbar vertebrae. , are the total mass of the outer nested structure and the middle nested structure (i.e. 21 kg), the mass of the innermost nested structure pulled out (i.e. 1 kg), respectively, is the total mass of the tooling (i.e. 22 kg). Figure 7 is a front view (yoz plane) of the spine box tooling and the chassis provided by the embodiment of the present application, which is consistent with the unfolded state of Figure 6 , Figure 7 and Figure 6Watch the contrast. , are vertical centroid positions of the outer nested structure and the middle nested structure respectively (estimated as 550 / 2=275mm), and the vertical centroid position of the innermost nested structure (i.e. 550+50=600mm) pulled out. is the mass of the chassis (i.e. 1kg), and are vertical centroid positions of the chassis (i.e. 50mm), the first counterweight, and the innermost nested structure (i.e. 550+50=600mm) respectively.

[0071] The above parameters are brought into formula (6), and based on formula (4), if the vertical centroid positions are to be consistent, then Zc =371mm, there is the following formula:

[0072] ; formula (7)

[0073] The solution X1=9.2kg is obtained, and since the mass of the counterweight is an integer, the first counterweight of 9kg is taken, which is brought into formula (6) to obtain Z c =370mm, compared with formula (4), the error is only 1mm, which satisfies the consistency of the vertical centroid positions.

[0074] Second step: calculate the total mass of the current spine box tooling and the chassis, and the difference with the reference mass. According to the difference, determine the second counterweight.

[0075] After the first step, the original mass of the spine box tooling is increased by 9kg, and the total mass is 32kg. The reference mass is =33.5kg, and the difference is 1.5kg. According to the difference and the density, the length of the second counterweight is determined.

[0076] The mass of the counterweight is rounded, so the difference of 1kg is brought into formula (1) m, and the density is brought into formula (1) , and the length of the second counterweight z=10mm is calculated.

[0077] Third step: insert the second counterweight into the hole of the outer nested structure, so that the horizontal centroid position above the lumbar spine is consistent with the reference horizontal centroid position.

[0078] Optionally, the second counterweight is inserted into the hole of the outer nested structure, so that the horizontal centroid position of the lumbar spine in the inclined state is consistent with the reference horizontal centroid position, and the y-direction centroid position of the upper part of the lumbar spine is as follows:

[0079] ; formula (8)

[0080] wherein, is the mass of the second counterweight (i.e. 1 kg). Figure 8 is the front view (yoz plane) of the spine box tooling and chassis after inserting the first counterweight and the second counterweight provided by the embodiments of the present application, which is the same as the unfolded state of Figure 6 and Figure 7 , and is viewed in contrast, is the y-direction centroid position of the second counterweight 5 (i.e. 100-10 / 2=95mm), , are the y-direction centroid positions of the outer nested structure and the middle nested structure, respectively (assuming 50mm), and the y-direction centroid position of the innermost nested structure after being pulled out (i.e. 100 / 2=50mm). is the y-direction centroid position of the chassis (i.e. 100 / 2=50mm), is the y-direction centroid position of the first counterweight, which is 50mm if the first counterweight is inserted into the center position of the tooling. Note that after inserting the first counterweight, the mass of is 10kg (i.e. the sum of the mass of the first counterweight and the mass of the innermost nested structure).

[0081] The masses of the counterweights in this embodiment are all integers, and the mass of the second counterweight is taken as 1kg, and the length z=10mm. The second counterweight is inserted into the second hole parallel to the y-direction in order to adjust the y-direction centroid position.

[0082] Substituting the parameters into equation (8), we get:

[0083] equation (9)

[0084] It can be seen that after inserting the first counterweight and the second counterweight, the y-direction centroid position error is only 0.1mm compared with equation (5), which satisfies the consistency of the y-direction centroid position. Since the tooling and the chassis are left-right symmetrical, there is basically no need to adjust the x-direction centroid position. Thus, in the vertical state of the tooling, the consistency of the three-dimensional centroid position is achieved.

[0085] In this lumbar spine calibration experiment, the tabletop needs to be adjusted to a set angle (for example, 22 degrees) with the horizontal plane, so after inserting the first counterweight and the second counterweight and tilting along the yoz plane, the y-direction centroid position of the part above the lumbar spine is:

[0086] equation (10)

[0087] Step 4: Verify the consistency of the centroid position above the lumbar spine with the reference centroid position.

[0088] The y-direction center of mass position of the upper part of the lumbar vertebrae of the reference dummy when tilted by 22 degrees is:

[0089] Equation (11)

[0090] It can be seen that the error of the y-direction center of mass position after tilting is also within the allowable range.

[0091] Similarly, the y-direction center of mass position of the upper part of the lumbar vertebrae after inserting the first and second counterweights and tilting along the y-o-z plane can be calculated is:

[0092] Equation (12)

[0093] The vertical center of mass position of the upper part of the lumbar vertebrae of the reference dummy when tilted by 22 degrees is calculated is:

[0094] Equation (13)

[0095] It can be seen that the error of the vertical center of mass position after tilting is also within the allowable range.

[0096] Further, similar to the method of adjusting the y-direction center of mass position, a third counterweight can be inserted into a second hole parallel to the x-direction to adjust the x-direction center of mass position to eliminate lateral deviation.

[0097] It should be noted that the final purpose of the present application is to ensure that the spinal column box tooling in the tilted state is consistent with the parameters (height, center of mass position and mass) of the upper part of the lumbar vertebrae of the reference dummy in the tilted state, without limiting the specific adjustment order. For example, after achieving height consistency, the consistency of the horizontal center of mass position can be adjusted first, and then the consistency of the vertical center of mass position can be adjusted. After the vertical center of mass position is consistent, it may also cause the horizontal center of mass position to be inconsistent, so return to continue adjusting the horizontal center of mass position. When adjusting the center of mass position, different mass counterweights can be replaced, so the consistency of the mass also needs to be adjusted repeatedly. It can be seen that due to the tilted state of the spinal column box tooling, the insertion of the counterweight will simultaneously affect the horizontal center of mass position and the vertical center of mass position, and the consistency of the center of mass position and the consistency of the mass need to be adjusted and verified repeatedly, and finally the height consistency, center of mass position consistency and mass consistency are achieved simultaneously.

[0098] In summary of the above embodiments, the present application has the following technical effects:

[0099] In order to overcome the problems of large mass, difficult operation and time-consuming and laborious measurement of upper torso, head and neck during the lumbar calibration of the current aviation dummy, the application provides a simple and reasonable device, which is high in economic applicability and meets the requirements of component replacement and center of mass adjustment at the current stage. The device can replace the upper lumbar of the dummy, and can calibrate multiple types of dummy with one device, thereby simplifying the lumbar calibration process. Meanwhile, the rationality of the lumbar calibration experiment can be ensured.

[0100] The creativity of the application is embodied in a simple lumbar calibration device, which can meet the requirements of lumbar calibration of different types of dummy through pulling, and can determine the mass and position of the original upper torso and other parts, determine the center of mass, select a reasonable spine box height, and install counterweight blocks in different directions according to the offset of the center of mass position, so as to ensure that the mass and center of mass are the same as the original device.

[0101] The novelty of the application is embodied in that the new device is used to complete the center of mass adjustment for the simplified lumbar calibration adjustment of the crash dummy, which is simpler, less expensive and easier to operate than the prior art, and simplifies the experimental process. Compared with the traditional lumbar calibration of the aviation dummy, the idea of partial replacement makes it easier to measure the experimental physical quantities.

[0102] The practicality of the application is embodied in that the pull-out spine box replaces the mass and center of mass of the upper torso, head and neck, and can meet the requirements of lumbar calibration of the 5th, 50th and 95th dummy through different heights of pulling, which can simplify the process of lumbar calibration, without the need to move the upper torso and other parts of the dummy, only the size and installation position of the required counterweight blocks need to be adjusted, and finally the process of lumbar calibration can be simplified.

[0103] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable apparatus. The computer instructions can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center through a wired manner, for example, coaxial cable, optical fiber, digital subscriber line (DSL) or a wireless manner, for example, infrared, wireless, microwave, etc. The computer-readable storage medium can be any available medium accessible by a computer, or a data storage device such as a server, data center, etc. integrated with one or more available media. The available medium can be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium or a semiconductor medium, etc. It should be noted that the computer-readable storage medium mentioned in the embodiments of the present application can be a non-volatile storage medium, in other words, can be a non-transitory storage medium.

[0104] It should be understood that the above-mentioned various forms of processes can be reordered, added or deleted. For example, the steps described in the present application can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in the present application can be achieved, which are not limited herein.

[0105] The above detailed description does not constitute a limitation on the scope of protection of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A method for calibrating the lumbar spine of an aircraft dummy, characterized in that, The device for lumbar spine calibration using an aviation dummy includes: a pull-out spine box fixture and a chassis; The chassis is used to connect the lumbar vertebrae and spine box tooling to be calibrated; The spine box fixture is used to simulate the height of the upper part of the lumbar spine when it is pulled out to different heights in a direction perpendicular to the horizontal plane. The spinal box fixture is provided with holes in different directions. By inserting counterweights into the holes, the mass and center of gravity of the upper part of the lumbar spine can be simulated. The method includes: The spinal box fixture is installed on the lumbar vertebra to be calibrated via the chassis; Obtain the reference height, reference mass, and reference center of mass position of the upper lumbar region of the reference dummy; Pull out the spine box fixture to make the height above the lumbar spine consistent with the reference height; Insert counterweights into the holes of the spinal box fixture to make the mass on the lumbar vertebrae match the reference mass, and make the position of the center of mass on the lumbar vertebrae match the position of the reference center of mass.

2. The calibration method for the lumbar spine of an aircraft dummy according to claim 1, characterized in that, The spine box fixture is a multi-layered nested structure in the shape of a cuboid; the height of the multi-layered nested structure decreases as it is pulled out from the inside to the outside.

3. The method for calibrating the lumbar spine of an aircraft dummy according to claim 2, characterized in that, The inner nested structure of the spine box tooling has a hole at the center of its side. The outer nested structure of the spine box tooling has holes on its side near the chassis.

4. The method for calibrating the lumbar spine of an aircraft dummy according to claim 3, characterized in that, A pull-out device is provided at the top center of the spine box fixture; A force-applying device is provided on the side of each nested structure to apply force to the spine box tooling.

5. The method for calibrating the lumbar spine of an aircraft dummy according to claim 1, characterized in that, A counterweight is inserted into the hole of the spine box fixture to make the mass on the lumbar vertebrae match the reference mass, and the position of the center of mass on the lumbar vertebrae match the position of the reference center of mass, including: Insert the first counterweight into the hole of the innermost nested structure so that the vertical center of mass above the lumbar vertebra is aligned with the reference vertical center of mass. Calculate the difference between the current total mass of the spine box tooling and chassis and the reference mass; The second counterweight is determined based on the difference. A second counterweight is inserted into the hole of the outer nested structure to make the horizontal center of mass above the lumbar vertebrae consistent with the reference horizontal center of mass.

6. The method for calibrating the lumbar spine of an aviation dummy according to claim 5, characterized in that, Insert a second counterweight into the holes of the outer nested structure to align the horizontal center of gravity above the lumbar vertebra with the reference horizontal center of gravity, including: Set the angle to tilt the current spine box fixture forward / backward; A second counterweight is inserted into the hole of the outer nested structure so that the horizontal center of mass position of the lumbar spine in the tilted state is consistent with the reference horizontal center of mass position.

7. The method for calibrating the lumbar spine of an aircraft dummy according to claim 6, characterized in that, After inserting a second counterweight into the holes of the outer nested structure to ensure that the horizontal center of gravity of the lumbar spine in an inclined state is consistent with the reference horizontal center of gravity, the process also includes: The consistency between the position of the center of mass on the lumbar spine and the reference center of mass position was verified.

8. The method for calibrating the lumbar spine of an aircraft dummy according to claim 5, characterized in that, Determining the second counterweight based on the difference includes: The length of the second counterweight is determined based on the difference and density.

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