Human chest impact simulation system for lateral impact working condition and storage medium

Abstract

The present application relates to the field of automobile collision safety, in particular to a human chest impact simulation system for lateral impact working condition and a storage medium, comprising a fixed support, a rib module, a damping module and a measurement module, the fixed support comprises a guide rail fixed plate, the guide rail fixed plate is detachably connected with a connecting plate and a rib fixed plate; the rib module comprises a plurality of ribs, the surface of the ribs is bonded with skin foam, and the ribs are connected with the rib fixed plate; the damping module comprises a guide rail, a sliding rail, a damper and a piston which are sequentially sleeved from outside to inside; the guide rail is connected with the guide rail fixed plate, the sliding rail is connected with the ribs, one end of the damper is provided with a boss, the boss is sleeved with a first spring, the piston is connected with a connecting rod, the connecting rod is connected with the sliding rail, and one end of the connecting rod is sleeved with a second spring; the measurement module is connected with the guide rail. The damper and the spring are embedded in the sliding rail to form a composite structure of "damping-spring-guide", which can truly simulate the collision process and has high experimental repeatability.

Description

[0001] This application is a divisional application of Chinese patent application 202311252205.4, "A human chest impact module for lateral impact conditions," filed on September 26, 2023. Technical Field

[0002] This invention relates to the field of automotive collision safety, specifically to a human chest impact simulation system and storage medium for lateral impact scenarios. Background Technology

[0003] Car crash test dummies are mechanical devices designed based on research findings in human biomechanics to simulate the structure and mechanical properties of the human body, simulating the biomechanical responses of pedestrians in crash tests. To realistically reflect the mechanical response of the human chest, the chest of the crash dummy is mainly composed of the sternal skeleton and chest skin. The ribs are the primary contributors to the chest response. To simulate car crash chest experiments, invention CN109141925A discloses a simple device for simulating the chest of a dummy used in frontal car crash tests, which deforms the intervertebral discs by compressing them with the sternum. Invention CN107766665A provides a rapid modeling method for the chest structure of a car side-impact test dummy, using springs to simulate collision deformation and obtain rib acceleration. Now, to make the rib impact test data more realistic and the test module reusable, a new human chest impact module for lateral impact conditions needs to be designed and improved based on existing technologies. Summary of the Invention

[0004] To address the aforementioned shortcomings, this invention provides a human chest impact simulation system and storage medium for lateral impact scenarios.

[0005] The basic solution provided by this invention is: a human chest impact module for lateral impact conditions, including a fixation bracket, a rib module, a damping module, and a measurement module; The fixed bracket includes a guide rail fixing plate, and the guide rail fixing plate is detachably connected to a connecting plate and a rib fixing plate; The rib module includes several ribs, the surface of which is adhered with skin foam, and the ribs are connected to the rib fixation plate. The damping module includes a guide rail, a slide rail, a damper, and a piston arranged sequentially from the outside to the inside; the guide rail is connected to the guide rail fixing plate, the slide rail is connected to the rib, one end of the damper is provided with a boss, the boss is sleeved with a first spring, the piston is connected with a connecting rod, the connecting rod is connected to the slide rail, and one end of the connecting rod is sleeved with a second spring. The measurement module is connected to the guide rail and is used to measure the deformation range of the ribs.

[0006] The advantages of this invention are: (1) The damper and spring are embedded in the slide rail to form a composite structure of "damping-spring-guide", which can realistically simulate the collision process. While ensuring the biomechanical response, the number of parts and the volume of the impactor are greatly reduced, making it convenient to replace parts and maintain equipment. (2) This module satisfies the design symmetry, adopts a composite structure, and has high experimental repeatability.

[0007] Furthermore, one end of the guide rail is provided with a first through hole, the slide rail is in clearance fit with the V-face of the first through hole, and the other end of the guide rail is provided with a vent hole.

[0008] Furthermore, a second through hole is provided at one end of the slide rail, and the damper is clearance-fitted with the second through hole.

[0009] Furthermore, one end of the damper is provided with a third through hole, and a stop block is connected inside the third through hole. The stop block is used to limit the piston.

[0010] Furthermore, the slide rail is detachably connected to the rib, and the connecting rod is detachably connected to the slide rail.

[0011] Furthermore, one end of the connecting rod is provided with a stepped boss, and the second spring is fixed on the stepped boss.

[0012] Furthermore, the measurement module includes a distance sensor, which is fixedly connected to the side of the guide rail and is used to detect the amount of deformation when the rib is deformed by impact.

[0013] Furthermore, the measurement module also includes a controller, a storage module, and an analysis module. The controller is electrically connected to the storage module, the analysis module, and the ranging sensor. The storage module is used to store the deformation data collected by the ranging sensor and sends the deformation data to the analysis module after the deformation is completed.

[0014] The beneficial effects of this invention are as follows: By impacting three ribs, the ribs deform, causing the slide rail and connecting rod to move to the left. Under the compression of the slide rail, the second spring contracts and stores energy, compressing the damper. The damper moves to the left, compressing the first spring. When the piston slides to the leftmost side of the third through hole and presses against it, the first spring contracts and stores energy under the further compression of the damper against the first through hole. The first spring contracts to its shortest length and then extends, causing the damper to move to the right. The second spring extends, causing the slide rail and connecting rod to move to the right. The above process forms a "damping-spring-mass" rib deformation simulation. The distance sensor continuously detects the rib deformation amplitude, and the collected deformation data is finally sent to the analysis module for analysis, thereby making the rib impact test data closer to reality and allowing the test module to be reused repeatedly. Attached Figure Description

[0015] Figure 1This is a structural diagram of the human chest impact module in Embodiment 1; Figure 2 This is a top view of the rib module and damping module in Embodiment 1; Figure 3 for Figure 2 Cross-sectional view at point AA; Figure 4 for Figure 2 Cross-sectional view at point BB; Figure 5 This is a schematic diagram of the architecture of Example 2; Figure 6 This is a schematic diagram of the operation of the ranging sensor in Example 2; Figure 7 This is a structural diagram of the human chest impact module after installing the counterweight in Example 3; Figure 8 This is a side view of the human chest impact module after the counterweight is installed in Embodiment 3; Figure 9 This is a simplified side view diagram of the human body model in Example 3; Figure 10 A schematic diagram comparing the pendulum force limit specified in ISO / TR 9790 with the actual measured pendulum force curve. Detailed Implementation

[0016] The following detailed description illustrates the specific implementation method: The markings in the accompanying drawings include: guide rail fixing plate 11, connecting plate 12, rib fixing plate 13, rib 21, skin foam 22, guide rail 31, first through hole 311, ventilation hole 312, anti-collision block 313, slide rail 32, second through hole 321, damper 33, third through hole 331, first spring 34, second spring 35, piston 36, connecting rod 37, stop block 38, screw 39, distance sensor 40, upper counterweight 51, lower counterweight 52, upper part of human body 61, chest segment 62, rotating shaft 63, lower part of human body 64.

[0017] In the description of this invention, it should be noted that the terms "upper," "lower," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0018] In the description of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "arrange" and "connect" shall be understood in a broad sense. For example, the connection may be a fixed connection, a detachable connection, or an integrated connection; it may be a mechanical connection (including various mechanical connection forms, such as couplings or gear pairs, etc.), or an electrical connection; it may be a direct connection, or an indirect connection through an intermediate medium, and it may be the internal communication between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific conditions.

[0019] Example 1 Example 1 is substantially as shown in the accompanying Figure 1 and accompanying Figure 2 drawings: A human chest impact module for lateral impact working conditions, comprising a fixed bracket, a rib module, a damping module and a measurement module. The chest specifically refers to the chest segment, which is specifically defined as the range from the upper tangent point of the first rib to the lower tangent point of the tenth rib when a pedestrian stands.

[0020] The fixed bracket comprises a connecting plate 12, a guide rail fixing plate 11 and a rib fixing plate 13. Two guide rail fixing plates 11 are connected by four connecting plates 12 with screws 39, forming a "grid-shaped" structure, and the rib fixing plate 13 is connected with the guide rail fixing plate 11 through screws 39.

[0021] The rib module comprises ribs 21 and skin foam 22. The skin foam 22 is fixedly connected to the outer side of the ribs 21 through an adhesive, and the ribs 21 are fixedly connected to the rib fixing plate 13 through screws 39. In this embodiment, the rib module comprises three ribs 21, wherein the height of a single rib 21 is 40 mm, and the gap between the ribs 21 is 16 mm. The dimensions are designed according to the anatomical data of human ribs 21. From the perspective of ergonomics, human height is closely related to the position of the center of gravity, moment of inertia, radius of rotation, etc. The adoption of the above dimensions conforming to human body dimensions will not cause the value of chest compression that characterizes chest injury to deviate from human body dimensions, and the response obtained from the experiment can represent the degree of chest injury when a pedestrian crossing the road is subjected to a lateral impact.

[0022] as shown in the accompanying Figure 3 and accompanying Figure 4As shown, the damping module includes a guide rail 31, a slide rail 32, a damper 33, a first spring 34, a second spring 35, and a connecting rod 37. The guide rail 31 is detachably connected to the guide rail fixing plate 11 by screws 39. One end of the guide rail 31 has a vent hole 312, and the other end has a first through hole 311. The first spring 34 is installed in the first through hole 311. The end of the guide rail 31 with the first through hole 311 is also provided with an anti-collision block 313 to prevent the rib 21 from colliding and being damaged by the guide rail 31 in extreme situations, thus playing a buffering and limiting role. The slide rail 32 is a hexagonal prism that slides in accordance with the V-face of the first through hole 311. One end of the slide rail 32 is connected to the inner side of the rib 21 by screws 39. The device is detachably connected, with a second through hole 321 at one end. A damper 33 and a second spring 35 are installed inside the second through hole 321. The damper 33 is clearance-fitted with the second through hole 321. One end of the damper 33 is provided with a stepped boss, which is sleeved with the first spring 34. The other end of the damper 33 is provided with a third through hole 331. A stop block 38 is provided inside the third through hole 331 to form a cavity. A piston 36 is provided inside the cavity and is clearance-fitted with the third through hole 331. The piston 36 is fixedly connected to one end of the connecting rod 37. The other end of the connecting rod 37 is connected to the slide rail 32 screw 39. A second spring 35 is provided in the middle of the connecting rod 37. One end of the second spring 35 abuts against the stop block 38.

[0023] The measurement module includes a distance sensor 40, which is fixedly connected to the side of the guide rail 31 by screws 39. The distance sensor 40 detects the amount of deformation when the rib 21 is deformed by impact.

[0024] The specific implementation process is as follows: In this embodiment, a standard hammer can be used to impact the three ribs 21, causing the ribs 21 to deform and move the slide rail 32 and connecting rod 37 to the left. Under the compression of the slide rail 32, the second spring 35 contracts and stores energy, and squeezes the damper 33. The damper 33 moves to the left and squeezes the first spring 34. When the piston 36 slides to the leftmost side of the third through hole 331 and presses against it, the first spring 34 contracts and stores energy under the further compression of the damper 33 against the first through hole 311. The first spring 34 contracts to its shortest length and then extends, causing the damper 33 to move to the right. The second spring 35 extends, causing the slide rail 32 and connecting rod 37 to move to the right. The above process forms a "damping-spring-mass" rib 21 deformation simulation. The distance sensor 40 continuously detects the deformation amplitude of the ribs 21.

[0025] Example 2 The technical features that distinguish this embodiment from Embodiment 1 are as follows: Figure 5 The measurement module also includes a controller, a storage module, and an analysis module. The controller is electrically connected to the storage module, the analysis module, and the ranging sensor. The storage module stores the deformation data of the ranging sensor 40. After the deformation of the rib 21 is complete, the data of the deformation stage is sent to the analysis module, which can convert the measured rib deformation into impact force.

[0026] As attached Figure 6 As shown, the distance sensor measures the deformation x of the rib along the contraction direction of the damper. The impact forces of a single rib at calibration hammer impact velocities of 2 m / s, 3 m / s, and 4 m / s are F2, F3, and F4, respectively. The specific force function expressions are as follows:

[0027]

[0028]

[0029] Where F represents the lateral impact force, and the impact force-deformation curve of a single rib module under different impact velocities is obtained accordingly.

[0030] The human chest impact module of this embodiment achieves mechanical properties similar to the elasticity of the chest of a real pedestrian, enabling the chest impact module to reflect the chest deformation of a real human body under lateral impact conditions, and to obtain the impact force-deformation curve of a single rib module at different impact velocities. This curve can represent the impact conditions of most pedestrian-vehicle collision accidents, and therefore has a wider range of applications.

[0031] This embodiment also includes a human chest impact simulation system for lateral impact conditions. This system can implement the above method steps and obtain the impact force-deformation curve of a single rib module under different impact velocities.

[0032] This embodiment also includes a storage medium storing a computer program, which, when executed by a processor, implements all the steps of the above method.

[0033] Example 3 The technical features that distinguish this embodiment from Embodiment 2 are as follows: Figure 7 With appendix Figure 8 As shown, the impact module is also equipped with an upper counterweight 51 and a lower counterweight 52. The upper counterweight 51 is used to simulate the mass of the head, neck, and arms above the chest of a human body. m 上 and moment of inertia I 上 The lower counterweight 52 simulates the mass of the human abdomen and legs below the chest. m 下 and moment of inertia I 下 All are connected to the connecting plate by screws.

[0034] This embodiment provides a counterweight method for a human chest impact module designed for lateral impact conditions, as detailed below: Before installing the counterweight, ensure that the center of gravity C of the impact module is within the correct range. 冲击模块 Located at the center of the plane of symmetry (up and down, left and right) of its second rib, and on the plane of asymmetry (front and back), the center of mass C 冲击模块 It should be located at position 13 of the rib fixation plate.

[0035] First, calculate the mass of the upper counterweight 51 that needs to be installed. m 上 Determine the location of the center of mass C of thoracic segment 62. 胸 The 50th percentile human anatomy model is placed in a spatial rectangular coordinate system. The 50th percentile human anatomy model is a type of human anatomy model used to study the physical characteristics of a population. Based on human body features, it reflects the morphological and structural characteristics of a population. In addition to structural features, this model also includes various organs and tissues.

[0036] As attached Figure 9 The human body model is divided into an upper body 61, a chest segment 62, and a lower body 64 using a plane perpendicular to the standing surface of the pedestrian, from the upper tangent point of the first rib to the lower tangent point of the tenth rib, resulting in a simplified side view of the human body model. The rotation axis 63 passes through the center of mass of the chest segment 62. C 胸 It is used to calculate the moment of inertia and is parallel to the coronal axis of the human body. The coronal axis of the human body refers to the axis that extends horizontally, is parallel to the horizontal plane, and is perpendicular to the sagittal plane.

[0037] Remove the upper human body 61 (head, neck, and arms) and the lower human body 64 (abdomen and legs), separate the chest segment 62 model, and calculate the center of mass C of the chest segment 62. 胸 The position is calculated using the following formula:

[0038] In the formula, r C胸 The radius vector of the chest's center of mass relative to the origin; m i The mass of the 62 organs and tissues in the thoracic segment; p i The vector representing the radius of each organ and tissue in thoracic segment 62 relative to the origin; M is the total mass of thoracic segment 62. .

[0039] Then, the lower part 64 (abdomen and legs) of the 50th percentile human model was removed, resulting in a human model including the chest segment 62 and the upper part 61 (head, neck, and arms). The center of mass C of the chest segment 62 model and the model with the lower part 64 removed were calculated relative to the chest segment 62. 胸 Moment of inertia I 胸 and I 无下 The calculation formula is as follows:

[0040] In the formula, r i The vertical distance from each organ and tissue of the thoracic segment 62 to the axis of rotation 63 of the thoracic segment 62; m i The quality of the 62 organs and tissues in the thoracic segment.

[0041]

[0042] In the formula, r n The vertical distance from the organs and tissues of the human model (excluding the lower part 64, abdomen and legs) to the axis of rotation 63 of the chest segment 62; m n Mass of organs and tissues removed from the lower 64 (abdomen and legs) of the human model.

[0043] The moment of inertia I of the upper human body (head, neck, and arms) was calculated. 上 ,Right now

[0044] The upper counterweight 51 is a regularly shaped cube, and the position C of the center of mass of the upper counterweight 51 can be obtained. 上 ,but

[0045] In the formula, L 上 The center of mass of the upper counterweight is C51. 上 With the center of mass C of the impact module 冲击模块 distance; z C上 Z is the Z-axis coordinate of the center of mass of the upper counterweight 51; C冲击模块 The Z-axis coordinate is the centroid of the impact module.

[0046] Chest center of mass C 胸 and the mass m of the upper counterweight 上 The formula is as follows:

[0047]

[0048] Then, calculate the mass of the lower counterweight 52 that needs to be installed. m 下 The formula is as follows:

[0049] In the formula, r C胸 The radius vector of the chest's center of mass relative to the origin; m i The mass of the 62 organs and tissues in the thoracic segment; p i This represents the radius vector of each organ and tissue in the 62-section thoracic body relative to the origin.

[0050] The lower counterweight 52 is a regularly shaped cube, and the position C of its center of mass can be obtained. 下 ,but

[0051]

[0052] In the formula r k The vertical distance from the organs and tissues of the human model (excluding the upper part 61, head, neck, and arms) to the axis of rotation 63 of the chest segment 62; m k To remove the mass of organs and tissues from the upper 61 (head, neck, and arms) of the human model; i The vertical distance from each organ and tissue of the thoracic segment 62 to the axis of rotation 63 of the thoracic segment 62; m i The mass of the 62 organs and tissues in the thoracic segment; z C下 Let z be the Z-axis coordinate of the center of mass of the lower counterweight 52; C冲击模块 The Z-axis coordinate is the centroid of the impact module.

[0053] According to the calculated mass of the upper counterweight 51 m 上 Mass of the lower counterweight 52 m 下， Install the counterweights and verify their accuracy. Use a dummy calibration device to perform a pendulum impact test on the chest impact module with the upper counterweight 51 and lower counterweight 52 installed, comparing the result to the pendulum force limits specified in ISO / TR 9790. Figure 10 In the figure, the horizontal axis represents time (in milliseconds), the vertical axis represents pendulum force (in N), the Lower Limit is the specified lower limit of pendulum force, the Upper Limit is the specified upper limit of pendulum force, and the Pendulum Force curve is the pendulum force curve obtained through pendulum impact test. If the pendulum force curve is within the range of the pendulum force limit channel, then the weight of the counterweight is accurate.

[0054] This embodiment also includes a human chest impact simulation system for lateral impact conditions, which can realize all the steps of the above-mentioned counterweight method for the human chest impact module.

[0055] This embodiment also includes a storage medium storing a computer program, which, when executed by a processor, implements all the steps of the above-described method for counterweighting the human chest impact module.

[0056] Those skilled in the art will understand that all or part of the processes in the above-described method for counterweighting a human chest impact module for lateral impact conditions can be implemented by a computer program instructing related hardware. The program can be stored in a non-volatile computer-readable storage medium. When executed, the program can include the processes of various embodiments of the above-described method for counterweighting a human chest impact module. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0057] The above are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A human chest impact simulation system for lateral impact conditions, characterized in that: Includes a fixation bracket, rib module, damping module, and measurement module; The fixed bracket includes a guide rail fixing plate, and the guide rail fixing plate is detachably connected to a connecting plate and a rib fixing plate; The rib module includes several ribs, the surface of which is adhered with skin foam, and the ribs are connected to the rib fixation plate. The damping module includes a guide rail, a slide rail, a damper, and a piston arranged sequentially from the outside to the inside; the guide rail is connected to the guide rail fixing plate, the slide rail is connected to the rib, one end of the damper is provided with a boss, the boss is sleeved with a first spring, the piston is connected to a connecting rod, the connecting rod and the boss are respectively located at both ends of the damper, the connecting rod is connected to the slide rail, and one end of the connecting rod is sleeved with a second spring; The measuring module is connected to the guide rail and is used to measure the deformation range of the ribs; The measurement module includes a distance sensor, which is fixedly connected to the side of the guide rail; The measurement module also includes a controller, a storage module, and an analysis module. The controller is electrically connected to the storage module, the analysis module, and the ranging sensor. The storage module is used to store the deformation data of the ranging sensor. After the rib deformation is completed, the data of the deformation stage is sent to the analysis module to convert the measured rib deformation into collision force. The distance sensor measures the deformation x of the rib along the direction of damper contraction. The impact forces of a single rib at calibration hammer impact velocities of 2 m / s, 3 m / s, and 4 m / s are F2, F3, and F4, respectively, and the force function expressions are as follows: Where F represents the lateral impact force, and the impact force-deformation curve of a single rib module under different impact velocities is obtained accordingly.

2. The human chest impact simulation system for lateral impact conditions according to claim 1, characterized in that: One end of the guide rail is provided with a first through hole, and the slide rail is in clearance fit with the V-face of the first through hole. The other end of the guide rail is provided with a vent hole.

3. The human chest impact simulation system for lateral impact conditions according to claim 1, characterized in that: The slide rail has a second through hole at one end, and the damper is clearance-fitted with the second through hole.

4. The human chest impact simulation system for lateral impact conditions according to claim 3, characterized in that: The damper has a third through hole at one end, and a stop block is connected inside the third through hole. The stop block is used to limit the piston.

5. A human chest impact simulation system for lateral impact conditions according to claim 1, characterized in that: The slide rail is detachably connected to the rib, and the connecting rod is detachably connected to the slide rail.

6. A human chest impact simulation system for lateral impact conditions according to claim 5, characterized in that: One end of the connecting rod is provided with a stepped boss, and the second spring is fixed on the stepped boss.

7. A human chest impact simulation system for lateral impact conditions according to any one of claims 1-6, characterized in that: The measurement module includes a distance sensor, which is fixedly connected to the side of the guide rail and is used to detect the amount of deformation when the rib is deformed by impact.

8. A storage medium, characterized in that: The storage medium stores a computer program, which, when executed by a processor, enables the implementation of a human chest impact simulation system for lateral impact conditions as described in any one of claims 1-7.

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