CN115855424A - Device and method for testing ankle injury of automobile crash dummy - Google Patents
Device and method for testing ankle injury of automobile crash dummy Download PDFInfo
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- CN115855424A CN115855424A CN202310165124.4A CN202310165124A CN115855424A CN 115855424 A CN115855424 A CN 115855424A CN 202310165124 A CN202310165124 A CN 202310165124A CN 115855424 A CN115855424 A CN 115855424A
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Abstract
The invention relates to the technical field of automobile collision safety, and discloses a device and a method for testing ankle injury of an automobile collision dummy. The device comprises an equipment base, wherein a fixing device, a sliding supporting device and a preloading device are arranged on the equipment base, the sliding supporting device is arranged on one side of the fixing device, a dummy lower limb is hinged to the fixing device, the foot bottom of the dummy lower limb is placed on the sliding supporting device, the preloading device used for simulating the supporting state of a driver in collision is arranged between the dummy lower limb and the equipment base, and when the sliding supporting device is impacted, the sliding supporting device can slide towards the dummy along the supporting device and transmits acting force to the foot of the dummy, so that the axial impact test on the ankle part of the dummy is realized. The injury value data fed back by the sensor can provide important reference value for developing lower limb protection equipment and optimizing pedal design.
Description
Technical Field
The invention relates to the technical field of automobile collision safety, in particular to a device and a method for testing ankle injury of an automobile collision dummy.
Background
With the gradual increase of the automobile holding capacity, the social attention of automobile safety is increasing, and the passive automobile safety technology is also receiving more and more attention as the last barrier for ensuring the safety of passengers in the automobile.
Among them, the automobile crash test dummy is an important device in the automobile crash test in which the main injury parts of the occupant are the head, neck, chest and lower limbs in the frontal collision. In recent years, with the continuous improvement and widespread use of seat belt and airbag design technologies, the risk of injury to the head and chest of an occupant has been greatly reduced. The lower extremities have already passed the head as the greatest risk of moderate and above injuries in vehicle accidents. Although lower limb injury does not constitute a fatal injury, the treatment process is long, the cost is high, and the physiological functions of the lower limbs of passengers are easily damaged or even disabled, wherein axial loading is considered as a main injury mechanism causing all the lower limb injuries. In a frontal collision accident, the forward movement of the passenger and the intrusion of the pedal are often accompanied by axial loading on the foot, and the load is transmitted to the lower leg along the ankle joint, so that the ankle part is easily damaged in the process. However, in the prior art, there is no device that simulates damage to the ankle caused by axial loading during an impact.
Disclosure of Invention
The invention aims to provide a device and a method for testing ankle injury of an automobile crash dummy, which aim to improve the problems. In order to achieve the above object, the present invention adopts the following technical solutions.
In a first aspect, the application provides a car collision dummy ankle damage testing arrangement, including the equipment base, be equipped with fixing device, slip strutting arrangement and preloading device on the equipment base, the slip strutting arrangement is established one side of fixing device, the articulated dummy low limbs that are provided with on the fixing device, the sole of dummy low limbs is placed on the slip strutting arrangement, dummy low limbs with be equipped with the preloading device who is used for simulating the support state of driver when bumping between the equipment base, work as the slip strutting arrangement receives the striking back, the slip strutting arrangement can slide to the direction of dummy to transmit the effort extremely the foot of dummy low limbs, and then realize the axial impact test to dummy ankle.
Preferably, the fixing device comprises a vertical plate, the vertical plate is connected with the equipment base through a support frame, the vertical plate is hinged with the lower limb clamp through a cross shaft, and the length of the lower limb clamp is equal to the distance from the middle section of the femur of the dummy to the hip joint.
Preferably, the preloading device comprises a lace, a rope, a pulley fixing frame, a spring and a hanger, wherein the lace comprises a first lace and a second lace, the first lace and the second lace are jointly bound on the lower limb of the dummy, the junction of the first lace and the second lace is connected with one end of the rope, the other end of the rope passes through the pulley arranged on the pulley fixing frame and is connected with the hanger through the spring, and the magnitude of the preloading force is adjusted according to the installation position of the hanger on the device base or the spring with different stiffness coefficients.
Preferably, the sliding support device comprises a sliding block and a telescopic sliding block support frame, the telescopic sliding block support frame is mounted on the device base, the sliding block is transversely arranged on the telescopic sliding block support frame, after an external force impacts one end of the sliding block, the sliding block moves on the telescopic sliding block support frame along the extension direction of the impact force, and the distance from the end surface of the telescopic sliding block support frame close to one side of the impact force to one end of the sliding block close to the external force is 115-125mm.
Preferably, the sliding support device further comprises a pedal, a force measuring sensor and a joint, one end of the force measuring sensor is arranged on a side plate of the pedal through a bolt, the length of the central axis of the force measuring sensor from the central axis of the tibia of the dummy is 140-144mm, the other end of the force measuring sensor is connected with the joint, the joint is connected with the sliding block through a bolt, and the pedal with different abduction angles is arranged, so that the axial impact test of feet under different initial dorsiflexion angles is realized.
Preferably, a buffer gasket is arranged at one side of the sliding block, which collides with the external force.
Preferably, the telescopic slider support frame comprises a fixing frame, a support and a base, wherein the fixing frame is vertically arranged on the base and comprises a first fixing frame and a second fixing frame, the first fixing frame and the second fixing frame are parallel to each other, the support is arranged between the first fixing frame and the second fixing frame, and the support is of a U-shaped structure.
Preferably, the bottom of the side plate of the pedal is also provided with an accelerometer.
In a second aspect, the present application also provides a crash dummy ankle injury testing method, comprising: collecting characteristic change data in the process of impacting the feet of the dummy, wherein the characteristic change data comprises the force value change condition measured by a force measuring sensor arranged at the pedal side plate, the acceleration value change condition measured by an accelerometer arranged at the bottom of the pedal side plate and the varus/valgus moment change condition measured by a force measuring sensor arranged at the ankle joint of the dummy when a pendulum is released to impact the sliding block and in the sliding process of the sliding block; wherein collecting the characteristic change data during impacting the foot of the dummy comprises: placing the soles of the dummy on the side plates of the pedals in parallel, placing the tail ends of the feet of the dummy on the bottom plate of the pedals, and setting initial spring pretightening force until the lower shinbone force reaches 1/2 of the gravity value of the dummy; calculating characteristic change data to obtain contact force data of the pedal and the foot; and judging the ankle damage test condition of the collision dummy according to the contact force data and the ankle joint varus/valgus moment data.
Preferably, the judging the ankle damage test condition of the crash dummy according to the contact force data and the ankle joint varus/valgus moment data comprises the following steps: when the peak contact force reaches 5.5kN, the ankle is at 20% risk of injury due to fracture; when the peak contact force reaches 9.3kN, the ankle part has 50% of damage risk of fracture; when the peak ankle varus/valgus moment reaches 33Nm, the risk of ankle ligament damage is 25%; when the peak ankle varus/valgus moment reaches 40Nm, the risk of ankle ligament damage is 50%.
The invention has the beneficial effects that: the ankle injury testing device for the automobile crash dummy can be suitable for testing ankle injuries of various percentile dummy at different impact speeds and different initial dorsiflexion angles; in addition, the device preloads the tibia through the spring, and effectively simulates the support state of a driver in frontal collision; the injury condition of the ankle part of the dummy can be effectively evaluated through a series of injury values fed back by the sensor, and a certain reference value is provided for developing lower limb protection equipment of passengers and optimizing pedal design.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the embodiments of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
FIG. 1 is a schematic view of the overall assembly of an ankle injury testing device for an automobile crash dummy according to an embodiment of the present invention.
FIG. 2 is a schematic diagram showing the components of a simulated human hip joint (without considering the influence of internal/external rotation) in the ankle injury testing device for an automobile crash dummy according to the embodiment of the present invention.
FIG. 3 is a schematic structural view of a telescopic slider support frame in the ankle injury testing device of the automobile crash dummy according to the embodiment of the invention.
In the figure, 1, an equipment base; 2. a vertical plate; 3. a support frame; 4. a cross shaft; 5. a lower limb clamp; 6. a dummy lower limb; 7. a tie strap; 8. a rope; 9. a pulley; 10. a pulley fixing frame; 11. a spring; 12. a hanger; 13. a pedal; 14. a force sensor; 15. a joint; 16. a slider; 17. a cushion pad; 18. a telescopic slider support frame; 19. a pendulum bob; 21. a fixed mount; 22. a support; 23. a base.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Example 1: referring to fig. 1, the embodiment provides a foot ankle injury testing device for an automobile crash dummy, which includes an apparatus base 1, the apparatus base 1 is provided with a fixing device, a sliding support device and a preloading device, the sliding support device is arranged on one side of the fixing device, the fixing device is provided with a dummy lower limb 6 in a hinged manner, the sole of the dummy lower limb 6 is placed on the sliding support device, the preloading device used for simulating the support state of a driver during collision is arranged between the dummy lower limb 6 and the apparatus base 1, after the sliding support device is impacted, the sliding support device can slide towards the dummy direction and transmit an acting force to the foot of the dummy lower limb 6, so as to realize an axial impact test on the foot ankle of the dummy.
It should be noted that the lower limb 6 of the prosthesis comprises a mid-femur, a knee, a lower leg, an ankle joint and a foot connected thereto.
Specifically, the fixing device comprises a vertical plate 2, the vertical plate 2 is connected with the equipment base 1 through a support frame 3, the vertical plate 2 is hinged with a lower limb clamp 5 through a cross shaft 4, and the length of the lower limb clamp 5 is equal to the distance from the middle section of the femur of the dummy to the hip joint.
As shown in fig. 1 and 2, the apparatus base 1, the vertical plate 2, the support frame 3, the cross shaft 4, and the lower limb clamp 5 constitute a fixing device. The vertical plate 2 is connected with the equipment base 1 through a support frame 3 and a bolt, and is connected with a lower limb clamp 5 through a cross shaft 4, and the length of the lower limb clamp 5 is equal to the distance from the middle section of the measured dummy femur (the far end of a thigh force sensor replacing block) to the hip joint. In addition, the combination of the U-shaped joint at the top of the vertical plate 2, the cross shaft 4 and the left U-shaped joint of the lower limb clamp 5 is used for simulating the physiological characteristics of the hip joint of the human body (the influence of internal/external rotation is not considered temporarily).
Specifically, the preloading device comprises a lace 7, a rope 8, a pulley 9, a pulley fixing frame 10, a spring 11 and a hanging frame 12, wherein the lace 7 comprises a first lace 7 and a second lace 7, the first lace 7 and the second lace 7 are jointly bound on the lower limb 6 of the dummy, the junction of the first lace 7 and the second lace 7 is connected with one end of the rope 8, the other end of the rope 8 bypasses the pulley 9 arranged on the pulley fixing frame 10 and is connected with the hanging frame 12 through the spring 11, and the magnitude of the preloading force is adjusted according to the installation position of the hanging frame 12 on the equipment base 1 or the spring 11 with different stiffness coefficients is replaced.
It should be noted that the lacing 7, the rope 8, the pulley 9, the pulley fixing frame 10, the spring 11 and the hanging frame 12 form a preloading device, the purpose of which is to preload the tibia so as to simulate the occupant supporting state formed by the driver instinctively stepping on the brake when the collision happens, the first lacing 7 and the second lacing 7 with a loop at one end are respectively bound at the distal end of the femur and the proximal end of the tibia of the dummy, one end of the rope 8 is tied in the loop at the junction of the first lacing 7 and the second lacing 7, bypasses the pulley 9 arranged on the pulley fixing frame 10, is connected with the spring 11 and is further connected to the hanging frame 12, and the magnitude of the preloading force can be flexibly adjusted by adjusting the installation position of the hanging frame 12 on the equipment base 1 or replacing the springs with different stiffness coefficients.
Specifically, the sliding support device comprises a sliding block 16 and a telescopic sliding block support frame 18, the telescopic sliding block support frame 18 is mounted on the device base 1, the sliding block 16 is transversely arranged on the telescopic sliding block support frame 18, after an external force impacts one end of the sliding block 16, the sliding block 16 moves on the telescopic sliding block support frame 18 along the extension direction of the impact force, and the distance from the end surface of the telescopic sliding block support frame 18 close to the impact force side to one end of the sliding block 16 close to the external force is 115-125mm.
It should be noted that, as shown in fig. 1, the sliding support device further includes a pedal 13, a load cell 14 and a joint 15, one end of the load cell 14 is disposed on a side plate of the pedal 13 through a bolt, wherein a central axis of the load cell 14 is 140-144mm away from a central axis of a tibia of the dummy, the other end of the load cell 14 is connected to the joint 15, the joint 15 is connected to the slider 16 through a bolt, and the pedal 13 with different abduction angles is disposed to realize axial impact tests of feet at different initial dorsiflexion angles.
The joint 15 is in an i-shaped structure, the pedal 13 is composed of a side plate simulating an automobile pedal and a bottom plate simulating an automobile floor, one end of the force measuring sensor 14 is connected to the side plate of the pedal 13 through a bolt, the length of an axis from the central axis of a tibia of the dummy is 142 +/-1.5 mm, the other end of the force measuring sensor is connected with the joint 15, the joint 15 is connected with a U-shaped joint at the left end of the sliding block 16 through a bolt, and a steering system is formed. In this embodiment, external impacts include, but are not limited to, impacts on the slider 16 with the pendulum 19, and the slider 16 will move to the left along the telescoping slider support frame 18 and effect an axial impact on the foot through the steering system.
In this embodiment, the device can obtain different shapes of energy pulse curves by adjusting the hardness of the buffer pad 17, the mass of the pendulum 19 and the release height, and can also realize the foot axial impact test under different initial dorsiflexion angles by installing the pedals 13 with different spread angles. The external force source is a pendulum 19 in this embodiment.
Specifically, a buffer pad 17 is disposed at a side of the slider 16 where the external force collides.
It should be noted that a cushion pad 17 is adhered to the right end of the slider 16 for cushioning and shock absorption.
Specifically, as shown in fig. 3, the telescopic slider support frame 18 includes a fixed frame 21, a support 22 and a base 23, the fixed frame 21 is vertically disposed on the base 23, the fixed frame 21 includes a first fixed frame 21 and a second fixed frame 21, the first fixed frame 21 and the second fixed frame 21 are parallel to each other, the support 22 is disposed between the first fixed frame 21 and the second fixed frame 21, and the support 22 is a U-shaped structure.
The telescopic slider support 18 is composed of a fixed frame 21, a U-shaped bracket 22, and a base 23. The support frame connection control device can realize the change of the height position of the support frame 22 by operating the control device, wherein the U-shaped support frame 22 not only can provide supporting force for the sliding of the sliding block, but also can limit the moving track of the sliding block.
It should be noted that the telescopic sliding block support frame 18 is fixed to the device base 1 through bolts, the left telescopic sliding block support frame is close to the joint end of the sliding block 16, and the right end face of the right telescopic sliding block support frame is 115mm-125mm away from the right end of the sliding block 16, so as to ensure that the pedal has a certain invasion amount.
Specifically, an accelerometer is further arranged at the bottom of the side plate of the pedal 13.
Wherein, the bottom of the side plate of the pedal 13 is provided with an accelerometer, the ankle joint of the dummy is provided with a five-axis force transducer, and the lower tibia of the dummy is provided with a force transducer.
The sole of the dummy should be placed in parallel on the side plate of the pedal 13 and the end of the foot should be placed on the bottom plate of the pedal 13, and the middle part of the femur of the dummy is connected with the lower limb clamp 5 through a bolt. The whole lower limb 6 can rotate relatively with the joint of the lower limb clamp 5 and the top of the vertical plate 2.
Example 2: the embodiment provides a collision dummy ankle injury testing method, which comprises the following steps: collecting characteristic change data in the process of impacting the foot of the dummy, wherein the characteristic change data comprises force value change conditions measured by a force measuring sensor 14, acceleration value change conditions measured by an accelerometer at the bottom of a side plate of a pedal 13 and varus/valgus moment change conditions measured by a force measuring sensor at the ankle joint of the dummy when a pendulum bob 19 is released to impact a slide block 16 and in the sliding process of the slide block 16; wherein collecting the characteristic change data during impacting the foot of the dummy comprises: placing the soles of the dummy on the side plates of the pedal 13 in parallel, placing the tail ends of the feet of the dummy on the bottom plate of the pedal 13, and setting the pretightening force of the initial spring 11 until the lower shinbone force reaches 1/2 of the gravity value of the dummy; calculating characteristic change data to obtain contact force data of the pedal 13 and the foot; and judging the ankle damage test condition of the collision dummy according to the contact force data and the ankle joint varus/valgus moment data.
It should be noted that the rigidity coefficient of the test device is taken as
And setting initial spring pretightening force until the lower tibia force reaches 1/2 of the gravity value of the whole test dummy. The mass of a given pendulum is 10 plus or minus 0.2kg, the release height is 1.8m-2m, the impact position is the front sole, and the acceleration of a pedal is recorded>
The measured value of the load cell 14->
And ankle joint varus/valgus moment>
The variation of (2).
According to pedal acceleration
Pedal quality->
And the measured value of the load cell 14->
Calculating contact force data of the pedal 13 and the foot>
：/>
。
Specifically, the method for judging the ankle injury test condition of the collision dummy according to the contact force data and the ankle joint varus/valgus moment data comprises the following steps: when the peak contact force reaches 5.5kN, the ankle fracture risk is 20%; when the peak value of the contact force reaches 9.3kN, the ankle part has 50 percent of damage risk of fracture; when the peak ankle varus/valgus moment reaches 33Nm, the risk of ankle ligament damage is 25%; when the peak ankle varus/valgus moment reaches 40Nm, the risk of ankle ligament damage is 50%.
The testing device of the embodiment can be suitable for ankle injury tests of various percentile dummy at different impact speeds and different initial dorsiflexion angles, effectively simulates the supporting state of a driver in frontal collision, and can effectively evaluate the injury condition of the ankle of the dummy through a series of injury values fed back by the sensor, thereby providing a certain reference value for developing lower limb protection equipment of passengers and optimizing pedal design.
Example 3: the present embodiment is described by taking a Hybrid III 50th dummy model as an example, and the device is adopted to test the ankle injury of the dummy.
Specifically, the collecting of feature change data during impact collision of a dummy's foot, previously comprising: setting an environment temperature, wherein the environment temperature is an environment with the room temperature of 20-22 ℃ and the relative humidity of 10% -70%, and placing the dummy in the environment temperature for at least 4 hours; and (3) disassembling the lower limb 6 of the dummy from the middle femur section, and respectively arranging force transducers at the ankle joint and the lower tibia of the lower limb 6 of the dummy.
Before the test, the dummy is required to be placed in an environment with the temperature of about 21 ℃ and the relative humidity of 10-70% for at least 4 hours, the lower limb 6 of the dummy is detached from the middle section of the femur, a five-axis force transducer is installed at the ankle joint, and a force transducer is installed at the position of the lower tibia of the dummy.
An accelerometer is arranged at the bottom of the lateral plate of the pedal 13, the sole of the foot of the dummy is arranged on the lateral plate of the pedal 13 in parallel, the tail end of the foot of the dummy is arranged on the bottom plate of the pedal 13, a force sensor 14 is arranged at the position which is 142 +/-1.5 mm away from the central axis 142 of the tibia of the dummy so as to ensure that the impact position is near the front sole, and the lower limb 6 of the dummy is removed. The joint 15 is fixed to the load cell 14, and its right side is connected by a bolt to a slider 16 attached with a cushion pad 17, whereby the construction of the slide device is realized. The length of the selected slide block 16 is 500mm, the left telescopic slide block support frame 18 is close to the U-shaped joint end of the slide block 16, and the right end face of the right telescopic slide block support frame 18 is 120mm away from the right end of the slide block 16, so that a certain invasion amount of the pedal 13 is ensured.
The positions of the sliding system and the telescopic sliding block support frame 18 are adjusted to ensure that the horizontal distance between the intersection line of the lower part of the bottom plate and the side plate in the pedal 13 and the vertical plate 2 is between 750 and 780mm, and the telescopic sliding block support frame 18 is fixed on the equipment base 1. The height of the telescopic sliding block supporting frame 18 is adjusted, so that the vertical distance from the intersection line of the lower part of the bottom plate and the side plate in the pedal 13 to the connecting center of the upper joint bolt of the vertical plate 2 is between 32 and 38 mm.
The lower limbs 6 of the dummy are mounted on the lower limb clamps 5, and the positions thereof are adjusted so that the soles thereof are placed in parallel on the side plates of the step plate 13 and the heel ends thereof are placed on the bottom plate of the step plate 13, as shown in fig. 1. A pulley fixing frame 10 and a pulley 9 are arranged below the knee part of the dummy, a lace 7 with a ring is respectively bound at the far end of the femur and the near end of the tibia, one end of a rope 8 is tied in the ring at the junction of the lace 7, the rope bypasses the pulley 9, and the other end of the rope is tied at the ring with the rigidity coefficient of
The other end of the spring 11 is fixed on a hanging rack 12, the hanging rack 12 is moved until the force of the lower shinbone of the dummy reaches 1/2 of the gravity value of the whole test dummy, and the hanging rack 12 in the state is fixed on the equipment base 1.
A pendulum 19 with a mass of 10kg is selected and its release position is adjusted so that the vertical height from the axis of the pendulum 19 to the axis of the slide 16 is 1.8m-2m. Releases the pendulum bob 19 and collects the acceleration of the pedal 13 during the impact and during the sliding of the slide
The measured value of the load cell 14->
And ankle joint varus/valgus moment>
The variation of (2).
Acceleration by pedal 13
The mass of the pedal 13->
And the measured value of the load cell 14->
Calculating the contact force &' of the pedal 13 with the foot>
According to>
。
According to the data obtained by the measurement and calculation, the damage condition of the ankle part of the dummy under the action of the axial impact load can be judged as follows: if the contact force
If the peak value of the fracture is less than 5.5kN, the risk of the ankle fracture injury is judged to be less than 20 percent; if the contact force is greater or less>
The peak value of the fracture coefficient is between 5.5kN and 9.3kN, and the damage risk of the fracture of the ankle part can be judged to be between 20 percent and 50 percent; if the contact force>
If the peak value of (A) is greater than 9.3kN, the risk of ankle fracture injury can be judged to be above 50%.
If ankle joint varus/valgus moment
If the peak value of (a) is less than 33Nm, the risk of ankle ligament injury can be judged to be less than 25%; if ankle joint varus/valgus moment>
Is between 33Nm and 40Nm, the risk of ankle ligament injury can be judged to be between 25% and 50%; if the ankle joint varus/valgus moment>
Above 40Nm, it can be judged that the ankle ligament injury risk is above 50%.
According to the damage testing device and method for the ankle part of the collision dummy under the action of the axial impact load, the dynamic impact process of the ankle part of the dummy in the collision process can be simulated accurately; the injury condition of the ankle of the dummy is evaluated through the injury value data fed back by the sensor, and a quantitative reference opinion can be provided for the development and optimization of lower limb injury protection equipment by combining an injury mechanism.
It should be noted that, regarding the apparatus in the above embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be described in detail here.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides an automobile collision dummy ankle part damage testing arrangement, includes equipment base (1), its characterized in that, be equipped with fixing device, slip strutting arrangement and preloading device on equipment base (1), the slip strutting arrangement is established one side of fixing device, the articulated dummy low limbs (6) that are provided with on the fixing device, the sole of dummy low limbs (6) is placed on the slip strutting arrangement, dummy low limbs (6) with be equipped with the preloading device who is used for simulating the support state of driver when bumping between equipment base (1), work as the slip strutting arrangement receives the striking back, the slip strutting arrangement can slide to the direction of dummy to transmit the effort to the foot of dummy low limbs (6), and then realize the axial impact test to the dummy ankle part.
2. The ankle injury testing device of the automobile crash dummy according to claim 1, wherein the fixing device comprises a vertical plate (2), the vertical plate (2) is connected with the equipment base (1) through a support frame (3), the vertical plate (2) is hinged with a lower limb clamp (5) through a cross shaft (4), and the length of the lower limb clamp (5) is equal to the distance from the middle femur to the hip joint of the dummy.
3. The ankle injury testing device of an automobile crash dummy according to claim 1, wherein the preloading device comprises a lace (7), a rope (8), a pulley (9), a pulley holder (10), a spring (11) and a hanger (12), wherein the lace (7) comprises a first lace and a second lace, the first lace and the second lace are jointly tied to the lower limb (6) of the dummy, the junction of the first lace and the second lace is connected with one end of the rope (8), the other end of the rope (8) bypasses the pulley (9) installed on the pulley holder (10) and is connected with the hanger (12) through the spring (11), and the magnitude of the preloading force is adjusted according to the installation position of the hanger (12) on the equipment base (1) or the replacement of the spring (11) with different stiffness coefficients.
4. The ankle injury testing device of the automobile crash dummy according to claim 1, wherein the sliding support device comprises a slider (16) and a telescopic slider support frame (18), the telescopic slider support frame (18) is mounted on the equipment base (1), the slider (16) is transversely arranged on the telescopic slider support frame (18), when an external force impacts one end of the slider (16), the slider (16) moves on the telescopic slider support frame (18) along the extension direction of the impact force, and the distance from the end surface of the telescopic slider support frame (18) close to the impact force side to the end of the slider (16) close to the external force is 115-125mm.
5. The ankle injury testing device of the automobile crash dummy according to claim 4, wherein the sliding support device further comprises a pedal (13), a load cell (14) and a joint (15), one end of the load cell (14) is disposed on a side plate of the pedal (13) by a bolt, wherein the length of the central axis of the load cell (14) from the central axis of the tibia of the dummy is 140-144mm, the other end of the load cell (14) is connected with the joint (15), the joint (15) is connected with the slider (16) by a bolt, and the pedal (13) with different abduction angles is set to realize the axial impact test of feet with different initial dorsiflexion angles.
6. The ankle injury testing device of the automobile crash dummy according to claim 4, wherein a cushion pad (17) is provided at a side of the slider (16) where an external force collides.
7. The ankle injury testing device of the automobile crash dummy according to claim 4, wherein the telescopic slider supporting frame (18) comprises a fixing frame (21), a bracket (22) and a base (23), the fixing frame (21) is vertically arranged on the base (23), the fixing frame (21) comprises a first fixing frame and a second fixing frame, the first fixing frame and the second fixing frame are parallel to each other, the bracket (22) is arranged between the first fixing frame and the second fixing frame, and the bracket (22) is of a U-shaped structure.
8. The ankle injury testing device of the automobile crash dummy according to claim 5, wherein an accelerometer is further provided at the bottom of the side plate of the pedal (13).
9. An ankle injury testing method for a crash dummy applied to the ankle injury testing apparatus for an automobile crash dummy according to any one of claims 1 to 8, comprising:
collecting characteristic change data in the process of impacting the foot of the dummy, wherein the characteristic change data comprises force value change conditions measured by a force measuring sensor (14), acceleration value change conditions measured by an accelerometer at the bottom of a side plate of a pedal (13) and varus/valgus moment change conditions measured by a force measuring sensor at the ankle joint of the dummy when a pendulum is released to impact a sliding block (16) and in the sliding process of the sliding block (16); wherein collecting feature change data during impacting the dummy's foot comprises, prior to: placing the soles of the dummy on the side plates of the pedals (13) in parallel, placing the tail ends of the feet of the dummy on the bottom plate of the pedals (13), and setting initial spring pretightening force until the lower shinbone force reaches 1/2 of the gravity value of the dummy;
calculating characteristic change data to obtain contact force data of the pedal (13) and the foot;
and judging the ankle injury test condition of the collision dummy according to the contact force data and the ankle joint varus/valgus moment data.
10. The impact dummy ankle injury test method of claim 9, wherein determining an impact dummy ankle injury test condition based on the contact force data and the ankle varus/valgus moment data comprises:
when the peak contact force reaches 5.5kN, the ankle is at 20% risk of injury due to fracture; when the peak value of the contact force reaches 9.3kN, the ankle part has 50 percent of damage risk of fracture;
when the peak ankle joint varus/valgus moment reaches 33Nm, the risk of ankle ligament injury is 25%; the risk of ankle ligament injury is 50% when the peak ankle joint varus/valgus moment reaches 40 Nm.
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