Aviation dummy lumbar vertebra calibration device and calibration method

Abstract

The invention relates to the technical field of dummy calibration, in particular to an aviation dummy lumbar vertebra calibration device and a calibration method. The device comprises a drawing type spine box tool and a chassis, the chassis is used for connecting a lumbar vertebra and spine box tool to be calibrated; the spine box tool is used for simulating the height of the upper portion of the lumbar vertebra when being pulled to different heights in the direction perpendicular to the horizontal plane. Holes in different directions are formed in the spine box tool, and the mass and the mass center position of the upper portion of the lumbar vertebra are simulated by inserting balancing weights into the holes. The device is reasonable in logic, easy to operate and high in economic applicability and meets the requirements for replacement and mass center adjustment of parts of the type at the present stage, the part above the dummy lumbar vertebra can be replaced with a simple device, multiple models and multiple types of dummies can be calibrated through one device, and the lumbar vertebra calibration process is simplified; and meanwhile, the rationality in the lumbar vertebra 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needs to be manually pushed, and the angle at which the upper torso returns to its upright position after the force is withdrawn is observed to determine if the lumbar spine meets regulations.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. 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

[0003] 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.

[0004] To achieve the above objectives, this application adopts the following technical solution: 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; 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 has 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.

[0005] Secondly, this application provides a method for calibrating the lumbar spine of an aircraft dummy, using the device for calibrating the lumbar spine of an aircraft dummy provided in the first aspect; 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.

[0006] Compared with the prior art, the beneficial effects of this application are as follows: This application improves upon the cumbersome process of disassembling and aligning the dummy during lumbar spine calibration using traditional dummies. For different dummy models, this application provides a device to meet the lumbar spine calibration requirements of various dummy sizes and dimensions for the upper torso, head, and neck, reducing the hassle of dummy handling and loading / unloading. Pre-drilled holes in different directions within the fixture allow for adjustment of the center of gravity. Based on the 5th dummy benchmark, this application utilizes an incremental pull-out design, requiring only the addition of counterweights to upgrade to other dummy parameters, significantly reducing adjustment time and the risk of human error. Furthermore, compared to imported custom-made fixtures, manufacturing costs are greatly reduced, and maintenance is easier. The pull-out height adjustment concept can also be applied to automotive collision dummies, expanding its applicability and providing a convenient and reliable technical solution for standardized calibration. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0008] Figure 1 This is a schematic diagram of a device for lumbar spine calibration of an aviation dummy provided in an embodiment of this application; Figure 2 This is another structural schematic diagram of the device for lumbar spine calibration of an aviation dummy provided in the embodiments of this application; Figure 3This is a schematic diagram of the structure of the spine box tooling in its fully retracted state provided in the embodiments of this application; Figure 4 This is a schematic diagram of the chassis structure provided in the embodiments of this application; Figure 5 This is a flowchart of a calibration method for the lumbar spine of an aviation dummy provided in an embodiment of this application; Figure 6 This is a schematic diagram showing the mass and height of the spine box tooling and chassis provided in the embodiments of this application; Figure 7 This is a front view of the spine box tooling and chassis provided in the embodiments of this application; Figure 8 This is a front view of the spine box fixture and chassis after the first and second counterweights have been inserted, as provided in the embodiments of this application. Among them, 1-spine box fixture, 2-chassis, 3-lumbar vertebra, 4-experimental table, 11-pull-out device, 12-force application device, 13-outer nested structure, 14-middle nested structure, 15-innermost nested structure, 16-first hole, 17-second hole, 18-guide rail, 21-round hole, 22-groove, 5-second counterweight. Detailed Implementation

[0009] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of this application, including various details to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0010] The present application will be further described in detail below with reference to the embodiments.

[0011] Figure 1 This is a schematic diagram of a device for lumbar spine calibration on an aviation dummy provided in an embodiment of this application. Figure 2 This is another structural schematic diagram of the device for lumbar spine calibration of an aviation dummy provided in the embodiments of this application, see below. Figure 1 and Figure 2 The device includes a pull-out spine box fixture 1 and a chassis 2.

[0012] The lumbar vertebra 3 to be calibrated is placed on the experimental table 4. The base 2 is used to connect the lumbar vertebra 3 to be calibrated and the spinal box fixture 1. The bottom of the spinal box fixture 1 has a guide rail 18 for connecting with the base 2, improving the ease of connection. When the spinal box fixture 1 is pulled out to different heights in a direction perpendicular to the horizontal plane, it is used to simulate the height of the upper part of the lumbar vertebra 3. Figure 1 and Figure 2In the design, the spine box fixture 1 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. The multi-layered nested structure includes 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).

[0013] See Figure 3 When the spine box fixture 1 is fully retracted, both inner nested structures are located within the outer nested structure. The total height of the chassis and spine box fixture at this point simulates the height of the upper lumbar region (including the head, neck, and upper torso) of the 5th dummy. After pulling out the innermost nested structure, the middle nested structure 14 remains within the outer nested structure 13. The total height of the chassis 2, outer nested structure 13, and innermost nested structure 15 at this point simulates the height of the upper lumbar region (including the head, neck, and upper torso) of the 50th dummy. Continuing to pull out the middle nested structure 14, the spine box fixture 1 is fully extended. The total height of the chassis 2, outer nested structure 13, middle nested structure 14, and innermost nested structure 15 at this point simulates the height of the upper lumbar region (including the head, neck, and upper torso) of the 95th dummy.

[0014] The spine box fixture 1 has holes in different directions. By inserting counterweights into these holes, the mass and center of gravity of the upper lumbar spine are simulated. Since the counterweights have a certain mass, once inserted into the spine box fixture 1, they become part of the fixture, increasing its mass. The position of the counterweight insertion also affects the center of gravity of the entire spine box fixture 1.

[0015] Figure 4 This is a schematic diagram of the chassis provided in this embodiment. The circular hole 21 on the chassis 2 is a reserved position for the lumbar vertebra, realizing the fixed connection between the lumbar vertebra 3 and the spinal box fixture 1. The groove 22 on the chassis 2 cooperates with the guide rail 18 to realize the installation of the spinal box fixture 1.

[0016] This application improves upon the cumbersome steps of disassembling the dummy and aligning the calibration fixture during traditional lumbar spine calibration. For different dummy models, this application provides a device to meet the lumbar spine calibration requirements of various dummy sizes and dimensions for the upper torso, head, and neck, reducing the hassle of dummy handling and loading / unloading. The spine box fixture 1 has pre-drilled holes in different directions, allowing for adjustment of the center of gravity. Based on the 5th dummy benchmark, this application utilizes an incremental pull-out design, requiring only the addition of counterweights to upgrade to other dummy parameters, significantly shortening adjustment time and reducing the risk of human error. Furthermore, compared to imported custom-made fixtures, manufacturing costs are greatly reduced and maintenance is convenient. The pull-out height adjustment concept can also be applied to automotive collision dummies, expanding its applicability and providing a convenient and reliable technical solution for standardized calibration.

[0017] In one specific embodiment, for ease of description and calculation, a three-dimensional coordinate system (represented by red lines) is constructed at the bottom of chassis 2. The z-axis is vertical, representing height; the x-axis is horizontal from the dummy's perspective, representing length (both the spine box fixture 1 and chassis 2 are symmetrical); the y-axis is front-back from the dummy's perspective, representing width. See also Figure 1 The origin of the three-dimensional coordinate system (red dot) is located at the midpoint of the length side of the bottom of the chassis.

[0018] See also Figure 2 On the two inner nested structures of the spine box fixture 1, a first hole 16 is provided at the center of the side; on the outer nested structure 13 of the spine box fixture 1, a second hole 17 is provided on the side near the base 2. The counterweight 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 gravity position, and the second hole 17 is mainly used to adjust the horizontal center of gravity position. Specifically, the second hole 17 in the x-direction is used to adjust the x-direction center of gravity position, and the second hole 17 in the y-direction is used to adjust the y-direction center of gravity position. Optionally, the depth of the hole is 100mm, and it can extend through the entire spine box fixture 1.

[0019] See also Figure 1 and Figure 2 At the top center of the spine box fixture 1, a pull-out device 11, which is a cube with a side length of 1cm, is provided. By squeezing the pull-out device 11, the inner nested structure can be easily pulled in and out, realizing the height adjustment of the spine box fixture 1. On the side of each nested structure, a force-applying device 12, also a cube with a side length of 1cm, is provided. It is used to apply force to the spine box fixture 1 through the force-applying device 12 to simulate the dynamic measurement scenario of the force on the upper part of the lumbar vertebra 3.

[0020] Figure 5 This is a flowchart illustrating a method for calibrating the lumbar spine of an aircraft dummy, as provided in an embodiment of this application. This embodiment uses the lumbar spine calibration device for the aircraft dummy provided in the previous embodiment, employing a spine box fixture 1 to simulate the height, mass, and center of gravity position of the upper part of the lumbar vertebra 3, thereby achieving lumbar spine calibration. See also... Figure 5 The method provided in this embodiment includes: S110. Install the spinal box fixture onto the lumbar vertebra to be calibrated via the chassis.

[0021] First, prepare the experimental table, the lumbar vertebra to be calibrated, the spinal box fixture, the chassis, and the reference dummy according to the calibration requirements. The reference dummy is the dummy to be simulated in this embodiment; its mass, center of mass position, and height are simulated by adjusting the spinal box fixture. The reference dummy can be a 5th percentile dummy, a 50th percentile dummy, or a 95th percentile dummy.

[0022] Then, install the lower part of the dummy's lumbar spine (including legs, feet, etc.), and connect the lumbar spine and the chassis with bolts to ensure that the chassis on the lumbar spine can support the spinal box tooling.

[0023] Finally, the spine box fixture is installed on the chassis.

[0024] S120. Obtain the reference height, reference mass, and reference center of mass position of the upper lumbar spine of the reference dummy.

[0025] S130, pull out the spine box fixture to make the height above the lumbar spine consistent with the reference height.

[0026] S140. Insert a counterweight into the hole of the spinal box fixture to make the mass on the lumbar vertebrae consistent with the reference mass and the center of mass on the lumbar vertebrae consistent with the center of mass position of the reference center of mass.

[0027] The upper lumbar region of the reference dummy includes the upper trunk, neck, and head. In practical applications, the reference height, reference mass, and reference center of gravity of the upper lumbar region of the reference dummy should first be calculated. These will serve as benchmark values ​​to guide the adjustment of the spine box tooling.

[0028] Optionally, a suspension method or a center of mass measuring instrument can be used to obtain the reference center of mass (a three-dimensional coordinate point) of the upper lumbar spine of the reference dummy. For the suspension method, the upper lumbar spine is suspended from a fixed fulcrum via a point (e.g., a firm connection point to the head), ensuring free and stable swinging before coming to a stop. Once the upper lumbar spine is completely still, a plumb line L1 is drawn through the suspension point on a background board behind it, using a weight (or a laser plumb line). The center of mass of the entire dummy must lie at some point on this line L1. The suspension point is then changed, and a second plumb line L2 is drawn. In three-dimensional space, the intersection of two non-parallel straight lines is the center of mass of the entire upper lumbar spine. In practice, it is usually necessary to take photos or measurements from at least two directions (e.g., side and front) and draw the two lines on the same drawing or three-dimensional model; their intersection is the location of the center of mass.

[0029] The total mass of the upper lumbar region of the reference dummy was measured using a weighing instrument; this is the reference mass. The reference dummy was then placed on the experimental table, and the height of the upper lumbar region of the reference dummy was measured using a ruler; this is the reference height.

[0030] After obtaining the reference height, reference mass, and reference center of gravity, when calibrating the lumbar spine using a dummy of the same model, or when replacing the lumbar spine for continued experimentation, the same mass can be used to replace all components above the lumbar spine. When calibrating the lumbar spine using dummy models of different models, the spine box fixture is pulled out according to the reference height, so that the height above the lumbar spine is consistent with the reference height. Counterweights are then inserted into the holes (including the first and second holes) of the spine box fixture to ensure that the mass above the lumbar spine is consistent with the reference mass, and that the center of gravity position above the lumbar spine is consistent with the reference center of gravity position, simplifying the process of replacing the lumbar spine.

[0031] It should be noted that "consistency" in this embodiment does not require the values ​​to be exactly the same; a certain error is allowed. For example, data within a 5mm error range are considered to be consistent.

[0032] When the spine box fixture is fully retracted, only the outer nested structure is exposed. The height and mass of the spine box fixture and the chassis are standard for the 5th dummy, with dimensions (length × width × height) of 250mm × 100mm × 550mm. The center of gravity (x, y, z) of the upper lumbar spine of the 5th dummy, i.e., the center of gravity of the fixture and chassis in the non-retracted state, is (0mm, 27mm, 326mm). The total mass of the spine box fixture is 22kg, with the outer nested structure weighing 20kg, the middle nested structure weighing 1kg, and the innermost nested structure weighing 1kg. The chassis is 100mm high and weighs 1kg.

[0033] The reference dummy is the 50th dummy, with a reference height of 650mm. The vertical (z-axis) center of mass positions of the 50th dummy's head, neck, and upper torso are 750mm, 650mm, and 330mm, respectively; the width-direction (y-axis) center of mass positions of the 50th dummy's head, neck, and upper torso are 50mm, 55mm, and 50mm, respectively. The masses of the 50th dummy's head, neck, and upper torso are 2.5kg, 1kg, and 30kg, respectively.

[0034] As can be seen, the 50th dummy is 100mm taller than the 5th dummy. Therefore, the innermost nested structure 15 in the spine box fixture can be pulled out. (See...) Figure 6 The middle nested structure 14 (represented by dashed lines) is retracted back into the spine box fixture 1. At this time, the total height of the spine box fixture 1 and the chassis 2 is 650mm, which is consistent with the reference height of the reference dummy.

[0035] Currently, see Figure 6The total mass of the spine box fixture 1 and the chassis 2 is 22kg + 1kg = 23kg. The total mass of the 50th dummy's head, neck, and upper torso is 2.5kg + 1kg + 30kg = 33.5kg. The total mass that needs to be compensated (i.e., the total mass of the counterweights that need to be inserted) is 33.5kg - 23kg = 10.5kg.

[0036] To facilitate mass adjustment, the counterweight in this embodiment is a steel block, and the following formula applies: ;Formula (1) Where m is the mass of the counterweight. Let z be the density of the counterweight, and z be its length. The mass of the counterweight is controlled by the length of z. Assume the counterweight has a uniform density and its center of mass is located at the center of the counterweight.

[0037] The following details how many counterweights to insert and where to insert them to achieve consistency in reference mass and reference center of mass.

[0038] Step 1: 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.

[0039] First, the reference dummy (i.e., the 50th dummy) is placed upright on the experimental table. Using the multi-rigid-body system centroid calculation method, the reference vertical centroid position and reference horizontal centroid position of the upright reference dummy are calculated: ;Formula (2) ;Formula (3) in, , , These are the masses of the head, neck, and upper torso of the 50th dummy. , , These are the vertical center of mass positions of the head, neck, and upper torso of the 50th dummy. , , These are the centroid positions of the head, neck, and upper torso of the 50th dummy in the width direction (y-direction). , These are the reference vertical center of mass position and the reference horizontal center of mass position of the upright reference dummy, respectively. Substituting the mass and center of mass position of the head, neck, and upper torso of the 50th dummy into formulas (2) and (3), we obtain formulas (4) and (5): ;Formula (4) ;Formula (5) Because the reference dummy is bilaterally symmetrical, the centroid of the upper lumbar spine of the reference dummy is 0 in the longitudinal direction (x-direction), i.e. x c =0. The center of mass of all subsequently inserted counterweights should be aligned with the reference center of mass.

[0040] First, keep the lumbar spine and the tooling in a horizontal-vertical position. This is achieved by inserting a counterweight (called the first counterweight) into the hole of the innermost nested structure, thus aligning the vertical center of gravity. Assuming the mass of the first counterweight is X1, the following equation holds: ;Formula (6) in, It is the vertical center of gravity of the tooling and chassis as a whole after the first counterweight is inserted, that is, the vertical center of gravity of the upper part of the lumbar spine. , These are the total mass of the outer and middle nested structures (i.e., 21 kg) and the mass of the innermost nested structure that was pulled out (i.e., 1 kg). This is the total mass of the tooling (i.e., 22 kg). Figure 7 This is a front view (yoz plane) of the spine box tooling and chassis provided in the embodiments of this application, and... Figure 6 Their unfolded states are consistent. Figure 7 and Figure 6 Compare and contrast. , These are the vertical centroid positions of the outer and middle nested structures (estimated at 550 / 2=275mm), and the vertical centroid position of the innermost nested structure that was pulled out (i.e., 550+50=600mm). It is the mass of the chassis (i.e., 1 kg). and These are the vertical center of gravity positions of the chassis (i.e., 50mm), the first counterweight, and the innermost nested structure (i.e., 550+50=600mm).

[0041] Substituting the above parameters into formula (6), and based on formula (4), if the vertical centroid position is to remain consistent, then it is necessary to... Zc =371mm, which exists in the following formula: ;Formula (7) The solution yields X1 = 9.2 kg. Since the mass of the counterweights is an integer, we take the first counterweight as 9 kg and substitute 9 kg into formula (6) to obtain Z. c =370mm, compared to formula (4), the error is only 1mm, which satisfies the consistency of the vertical centroid position.

[0042] Step 2: Calculate the total mass of the current spine box fixture and chassis, and the difference between it and the reference mass. Determine the second counterweight based on the difference.

[0043] After the first step, 9 kg was added to the original weight of the spine box fixture, bringing the total weight to 32 kg. The reference weight is 33.5 kg, with a difference of 1.5 kg. Based on this difference and the density, the length of the second counterweight was determined.

[0044] Rounding down the mass of the counterweight, we substitute the difference of 1 kg into m in formula (1), and substitute the density into formula (1). The length of the second counterweight was calculated to be z=10mm.

[0045] Step 3: Insert the second counterweight into the hole of the outer nested structure so that the horizontal center of mass above the lumbar vertebra is aligned with the reference horizontal center of mass.

[0046] Optionally, a second counterweight is inserted into the holes of the outer nested structure to make the horizontal center of mass position of the lumbar spine in the tilted state consistent with the reference horizontal center of mass position, and the y-axis center of mass position of the upper lumbar spine. as follows: ;Formula (8) in, It is the mass of the second counterweight (i.e., 1 kg). Figure 8 This is a front view (yoz plane) of the spine box fixture and chassis after the insertion of the first and second counterweights, as provided in the embodiments of this application, and... Figure 6 and Figure 7 They are in the same unfolded state, and can be compared and viewed. It is the position of the center of mass in the y-direction of the second counterweight 5 (i.e., 100-10 / 2=95mm). , These are the y-axis centroid positions of the outer nested structure and the middle nested structure (assuming they are 50mm), and the y-axis centroid position of the innermost nested structure that was pulled out (i.e., 100 / 2=50mm). It is the position of the chassis's center of gravity in the y-direction (i.e., 100 / 2 = 50mm). This is the y-axis center of gravity position of the first counterweight. If the first counterweight is inserted into the center of the fixture, the y-axis center of gravity position is 50mm. Note that after inserting the first counterweight, The mass is 10 kg (that is, the sum of the mass of the first counterweight and the innermost nested structure).

[0047] In this embodiment, the mass of the counterweights is an integer. Here, the mass of the second counterweight is 1 kg, and its length z = 10 mm. The second counterweight is inserted into the second hole parallel to the y-direction to adjust the position of the y-direction center of mass.

[0048] Substituting the parameters into formula (8), we get: ;Formula (9) As can be seen, after inserting the first configuration block and the second counterweight block, compared with formula (5), the error in the y-axis centroid position is only 0.1mm, which satisfies the consistency of the y-axis centroid position. Since the tooling and the chassis are both symmetrical, there is basically no need to adjust the x-axis centroid position. Thus, in the vertical state of the tooling, the consistency of the three-dimensional centroid position is achieved.

[0049] This lumbar spine calibration experiment requires adjusting the experimental table to a set angle (e.g., 22 degrees) with the horizontal plane. After inserting the first and second counterweights and tilting them along the yoz plane, the position of the y-axis centroid of the part above the lumbar spine is determined. for: ;Formula (10) Step 4: Verify the consistency between the position of the center of mass on the lumbar spine and the reference center of mass position.

[0050] The position of the center of mass in the y-direction of the upper lumbar region of a reference dummy tilted at 22 degrees. for: ;Formula (11) It can be seen that the error in the position of the centroid in the y-direction after tilting is also within the allowable range.

[0051] Similarly, the position of the center of mass in the y-direction above the lumbar spine can be calculated after inserting the first and second counterweights and tilting along the yoz plane. for: ;Formula (12) The vertical center of mass of the upper lumbar spine of the reference dummy was calculated when it was tilted at 22 degrees. for: ;Formula (13) It is evident that the error in the vertical position of the center of mass after tilting is also within the allowable range.

[0052] Furthermore, similar to the method of adjusting the center of mass position in the y-direction, a third counterweight can be inserted into a second hole parallel to the x-direction to adjust the center of mass position in the x-direction and eliminate lateral offset.

[0053] It should be noted that this application ultimately aims to ensure the consistency of parameters (height, center of gravity position, and mass) between the tilted spinal box fixture and the upper lumbar spine of the tilted reference dummy, without specifying a particular adjustment sequence. For example, after achieving height consistency, the consistency of the horizontal center of gravity position can be adjusted first, followed by the consistency of the vertical center of gravity position. Even after achieving vertical center of gravity consistency, the horizontal center of gravity position may become inconsistent again, requiring a return to adjusting the horizontal center of gravity position. When adjusting the center of gravity position, different masses of counterweights may be used, necessitating repeated adjustments to ensure mass consistency. Therefore, because the spinal box fixture is tilted, the insertion of counterweights simultaneously affects both the horizontal and vertical center of gravity positions. Consistency in center of gravity position and mass consistency requires repeated adjustments and verification to ultimately achieve simultaneous consistency in height, center of gravity position, and mass.

[0054] In summary, the present application has the following technical effects based on the above embodiments: To overcome the problems of large mass, difficult operation, and time-consuming and laborious measurement of different models of dummies when calibrating the lumbar spine using current aviation dummies, this application provides a logically sound, simple, and economically viable device that meets the current requirements for component replacement and center of gravity adjustment. This allows for the simple replacement of the upper part of the lumbar spine of the dummy using a single device, simplifying the lumbar spine calibration process by enabling the calibration of multiple models and types of dummies with a single device. Simultaneously, it maintains the rationality of the lumbar spine calibration experiment.

[0055] The inventiveness of this application lies in: a simple device for lumbar spine calibration, which can meet the lumbar spine calibration of different models of dummies by pulling it out, and determines the mass and position of the original upper torso and other parts through calculation and analysis, determines the center of gravity, selects a reasonable height of the spine box, and installs counterweights in different directions according to the offset of the center of gravity, thereby ensuring that the mass and center of gravity are the same as the original device.

[0056] The novelty of this application lies in its use of a new device to achieve center of gravity adjustment for the new requirement of simplified lumbar spine calibration and adjustment of collision dummies. This device is less complex, less costly to operate, and easier to use than existing technologies, thus simplifying the experimental procedure. Compared to traditional lumbar spine calibration using aviation dummies, the partial substitution approach makes it easier to measure experimental physical quantities.

[0057] The practicality of this application is reflected in the fact that the pull-out spine box replaces the mass and center of gravity of the upper torso, head, and neck. By pulling it out to different heights, it can meet the lumbar spine calibration of 5th, 50th, and 95th model dummies, which can simplify the lumbar spine calibration process. There is no need to move the upper torso and other parts of the dummies. Only the size and installation position of the required counterweight need to be adjusted, which ultimately simplifies the lumbar spine calibration process.

[0058] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented, in whole or in part, as 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 this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired means, such as coaxial cable, optical fiber, digital subscriber line (DSL), or wireless means, such as infrared, wireless, microwave, etc. The computer-readable storage medium can be any available medium that a computer can access, or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium, or a semiconductor medium, etc. It is worth noting that the computer-readable storage medium mentioned in the embodiments of this application can be a non-volatile storage medium, in other words, it can be a non-transient storage medium.

[0059] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this application can be achieved, and this is not limited herein.

[0060] The specific embodiments described above do not constitute a limitation on the scope of protection of this 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 substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A device for lumbar spine calibration on an aircraft dummy, characterized in that, include: Pull-out spine box fixture and 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 has 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.

2. The device for lumbar spine calibration of an aviation 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 device for lumbar spine calibration of an aviation 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 device for lumbar spine calibration of an aviation 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. A method for calibrating the lumbar spine of an aircraft dummy, characterized in that, The device for lumbar spine calibration using an aircraft dummy as described in any one of claims 1-4; 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.

6. The method for calibrating the lumbar spine of an aviation dummy according to claim 5, 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.

7. The method for calibrating the lumbar spine of an aircraft dummy according to claim 6, 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.

8. The method for calibrating the lumbar spine of an aircraft dummy according to claim 7, 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 was verified.

9. The method for calibrating the lumbar spine of an aviation dummy according to claim 6, 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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