Simulated human body target fixing device for realizing dynamic release in explosion impact environment

Abstract

The invention relates to a simulated human body target fixing device capable of realizing dynamic release in an explosion impact environment, which comprises a base, an electromagnetic locking device, a telescopic back plate, an adjusting baffle plate, a buffer module and a data acquisition module, and is characterized in that the electromagnetic locking device is positioned between the base and the telescopic back plate; the electromagnetic locking device is arranged on the base, the electromagnetic locking device is connected with the base and the telescopic back plate through bolts, the adjusting baffle is fixed to a sliding rail of the telescopic back plate through bolts, the buffer module is installed on the ground and behind the telescopic back plate, and the data acquisition module is electrically connected with the electromagnetic locking device through an electric wire. The simulated human body target fixing device for realizing dynamic release in the explosion impact environment can reduce the cost, simplify the process and provide fixed support for the simulated human body target, and has the advantages of simple structure, convenience in operation, reliability in test and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of explosion shock test equipment, particularly to the field of target testing for explosive disposal and explosion protection, and specifically refers to a simulation human target fixing device that realizes dynamic release under an explosion shock environment. Background Art

[0002] With the economic transition and social transformation, the incidents of firearm shootings and explosions have increased significantly, and the use of simulation human targets is of great importance. The protective equipment for explosive disposal and explosion protection is crucial for ensuring the safety of operating personnel.

[0003] Currently, the HybridⅢ impact test dummy is used in the existing target testing for explosive disposal and explosion protection. The production process of this HybridⅢ impact test dummy is complex and costly. During the test, the fixing method is traditional rigid fixing (such as bolt locking), which cannot simulate the natural dumping of the human body after being impacted, resulting in distorted data. There are also some that use simple buffer devices (such as spring bases), but during the test, there is a lack of controllability of the impact threshold, and it is prone to fatigue failure due to high-frequency impacts. To reduce costs, our research group designed a simulation human target. This target is determined according to the 50th percentile size of adults in the standard GB / T 10000-2023. However, there is currently no device that meets the installation requirements for testing this target. Therefore, it is urgent to design a simulation human target fixing device that can be dynamically released under an explosion shock environment. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned drawbacks of the existing technology and provide a simulation human target fixing device that realizes dynamic release under an explosion shock environment, which features simple structure, low cost, and a relatively wide range of applications.

[0005] To achieve the above purpose, the simulation human target fixing device that realizes dynamic release under an explosion shock environment of the present invention is as follows:

[0006] The simulation human target fixing device that realizes dynamic release under an explosion shock environment mainly includes a base, an electromagnetic locking device, a telescopic backboard, an adjustment baffle, a buffer module, and a data acquisition module. The electromagnetic locking device is located between the base and the telescopic backboard, and the electromagnetic locking device is respectively connected to the base and the telescopic backboard through bolts. The adjustment baffle is fixed to the slide rail of the telescopic backboard through bolts. The buffer module is installed on the ground and behind the telescopic backboard. The data acquisition module is electrically connected to the electromagnetic locking device through wires.

[0007] Preferably, the base includes a bottom platform, a screw rod, a nut, and a support plate. The screw rod is installed at the bottom of the support plate through the nut, and the bottom platform is installed at the bottom of the screw rod.

[0008] Preferably, the electromagnetic locking device includes a lower electromagnetic plate, an electromagnet, a metal hinge, and an upper electromagnetic plate. The lower electromagnetic plate and the upper electromagnetic plate are connected by the metal hinge. The metal plate is located between the upper electromagnetic plate and the lower back plate, and the metal plate is respectively connected to the upper electromagnetic plate and the lower back plate by bolts.

[0009] Preferably, the telescopic back plate includes a lower back plate, a chute, a lower slide rail, an upper back plate, an upper slide rail, and a threaded hole. The lower back plate and the upper back plate are connected by bolts. The chute is installed on the lower back plate. The upper back plate is located in the chute of the lower back plate. The lower slide rail is arranged on the lower back plate. The upper slide rail and the threaded hole are arranged on the upper back plate.

[0010] Preferably, the adjusting baffle includes a lower U-shaped adjusting baffle, an adjusting belt hole, a middle U-shaped adjusting baffle, an upper U-shaped adjusting baffle, and an adjusting belt. The lower U-shaped adjusting baffle, the middle U-shaped adjusting baffle, and the upper U-shaped adjusting baffle are fixed on the slide rail of the telescopic back plate by bolts, and the positions of the lower U-shaped adjusting baffle, the middle U-shaped adjusting baffle, or the upper U-shaped adjusting baffle on the slide rail support adjustment; the adjusting belt hole is arranged on one side of the adjusting baffle, and the adjusting belt is arranged on the other side of the adjusting baffle.

[0011] Preferably, the buffer module includes an upper base, a set of disc springs, an energy-absorbing sponge, a lower base, and a bottom plate. The set of disc springs is arranged on the back of the upper base and is located on the upper back plate. The energy-absorbing sponge, the set of disc springs, the lower base, and the bottom plate are all located on the ground.

[0012] Preferably, the data acquisition module includes a switch, a display, a converter, a controller, and a sensor. The sensor is arranged on the electromagnetic locking device. The switch, the display, the converter, and the controller are all connected to the electromagnetic locking device by wires.

[0013] Preferably, the telescopic back plate and the adjusting baffle are provided with energy-absorbing sponges.

[0014] Preferably, the buffer module is provided with an automatic reset module. After the target falls, it is automatically reset to the upright state by a pneumatic push rod.

[0015] Preferably, the telescopic back plate is in a seat structure and is suitable for human targets in different postures.

[0016] The simulated human target fixing device for realizing dynamic release in an explosion shock environment of the present invention can reduce costs, simplify processes, provide fixed support for the simulated human target, and has the advantages of simple structure, convenient operation, and reliable testing. Description of the Drawings

[0017] Figure 1Schematic diagram of the fixing device for the simulated human target that achieves dynamic release under the explosion shock environment of the present invention.

[0018] Figure 2 Schematic diagram of the buffer device of the fixing device for the simulated human target that achieves dynamic release under the explosion shock environment of the present invention.

[0019] Reference numerals:

[0020] 1 Base

[0021] 2 Screw

[0022] 3 Nut

[0023] 4 Support plate

[0024] 5 Lower electromagnetic plate

[0025] 6 Upper electromagnet

[0026] 7 Metal hinge

[0027] 8 Upper electromagnetic plate

[0028] 9 Metal plate

[0029] 10 Lower back panel

[0030] 11 Lower U-shaped adjustment baffle

[0031] 12 Slide groove

[0032] 13 Lower slide rail

[0033] 14 Adjusting hole

[0034] 15 Middle U-shaped adjustment baffle

[0035] 16 Bolt

[0036] 17 Upper back panel

[0037] 18 Upper slide rail

[0038] 19 Upper U-shaped adjustment baffle

[0039] 20 Upper base

[0040] 21 Adjusting belt

[0041] 22 Threaded hole

[0042] 23 Sensor

[0043] 24 Electric wire

[0044] 25 Switch

[0045] 26 Display

[0046] 27 Converter

[0047] 28 Controller

[0048] 29 Disc Spring Group

[0049] 30 Energy Absorbing Sponge

[0050] 31 Lower Base

[0051] 32 Bottom Plate Specific Embodiment

[0052] In order to more clearly describe the technical content of the present invention, the following will be further described in combination with specific embodiments.

[0053] The simulated human target fixing device for realizing dynamic release in the explosion shock environment of the present invention includes a base, an electromagnetic locking device, a telescopic back plate, an adjusting baffle, a buffer module and a data acquisition module. The electromagnetic locking device is located between the base and the telescopic back plate, and the electromagnetic locking device is respectively connected to the base and the telescopic back plate by bolts. The adjusting baffle is fixed on the slide rail of the telescopic back plate by bolts. The buffer module is installed on the ground and behind the telescopic back plate. The data acquisition module is electrically connected to the electromagnetic locking device through wire 24.

[0054] As a preferred embodiment of the present invention, the base includes a base table 1, a screw 2, a nut 3 and a support plate 4. The screw 2 is installed at the bottom of the support plate 4 through the nut 3. The base table 1 is installed at the bottom of the screw 2.

[0055] As a preferred embodiment of the present invention, the electromagnetic locking device includes a lower electromagnetic plate 5, an electromagnet 6, a metal hinge 7 and an upper electromagnetic plate 8. The lower electromagnetic plate 5 and the upper electromagnetic plate 8 are connected by the metal hinge 7. A metal plate 9 is located between the upper electromagnetic plate 8 and the lower back plate 10, and the metal plate 9 is respectively connected to the upper electromagnetic plate 8 and the lower back plate 10 by bolts.

[0056] As a preferred embodiment of the present invention, the telescopic back plate includes a lower back plate 10, a chute 12, a lower slide rail 13, an upper back plate 17, an upper slide rail 18 and a threaded hole 22. The lower back plate 10 and the upper back plate 17 are connected by bolts. The chute 12 is installed on the lower back plate 10. The upper back plate 17 is located in the chute 12 of the lower back plate 10. The lower slide rail 13 is provided on the lower back plate 10. The upper slide rail 18 and the threaded hole 22 are provided on the upper back plate 17.

[0057] As a preferred embodiment of the present invention, the adjusting baffle includes a lower U-shaped adjusting baffle 11, an adjusting belt hole 14, a middle U-shaped adjusting baffle 15, an upper U-shaped adjusting baffle 19 and an adjusting belt 21. The lower U-shaped adjusting baffle 11, the middle U-shaped adjusting baffle 15 and the upper U-shaped adjusting baffle 19 are fixed on the slide rail 13 of the telescopic backboard by bolts, and the positions of the lower U-shaped adjusting baffle 11, the middle U-shaped adjusting baffle 15 or the upper U-shaped adjusting baffle 19 on the slide rail 13 support adjustment; the adjusting belt hole 14 is arranged on one side of the adjusting baffle, and the adjusting belt 21 is arranged on the other side of the adjusting baffle.

[0058] As a preferred embodiment of the present invention, the buffer module includes an upper base 20, a set of disc springs 29, an energy-absorbing sponge 30, a lower base 31 and a bottom plate 32. The set of disc springs 29 is arranged on the back of the upper base 20 and is located on the upper backboard 17, and the energy-absorbing sponge 30, the set of disc springs 29, the lower base 31 and the bottom plate 32 are all located on the ground.

[0059] As a preferred embodiment of the present invention, the data acquisition module includes a switch 25, a display 26, a converter 27, a controller 28 and a sensor 23. The sensor 23 is arranged on the electromagnetic locking device, and the switch 25, the display 26, the converter 27 and the controller 28 are all connected to the electromagnetic locking device through a wire 24.

[0060] As a preferred embodiment of the present invention, the telescopic backboard and the adjusting baffle are provided with an energy-absorbing sponge 29.

[0061] As a preferred embodiment of the present invention, the buffer module is provided with an automatic reset module. After the target falls, it is automatically reset to an upright state through a pneumatic push rod.

[0062] As a preferred embodiment of the present invention, the telescopic backboard is a seat structure and is suitable for human targets in different postures.

[0063] In the specific embodiments of the present invention, there is provided a fixing device for a simulated human target that can be dynamically released under an explosion shock environment. During the test, the height of the upper and lower telescopic backplates is adjusted according to the height of the simulated human target, the specific positions of the baffle on the slide rail and the buffer module on the ground are adjusted, and the simulated human target is fixed by adjusting the adjusting belt on the baffle. The switch of the data acquisition module is turned on, the threshold of the sensor is set, and the converter is adjusted to make the electromagnet between the lower electromagnetic plate and the upper electromagnetic plate tightly attracted. At this time, the fixing device with the simulated human target stands vertically. The controller is adjusted to trigger the explosion of gunpowder. When the sensor reaches the preset threshold, the converter adjusts to cut off the power supply of the electromagnet between the lower electromagnetic plate and the upper electromagnetic plate, and the fixing device with the simulated human target falls backward onto the buffer module. The impact force value of the simulated human target can be obtained through the data acquisition module, and the surface damage degree of the bionic dummy target can be visually inspected. It has the advantages of simple structure, convenient operation, and reliable testing.

[0064] The fixing device for a simulated human target that can be dynamically released under an explosion shock environment of the present invention is composed of a base, an electromagnetic locking device, a telescopic backplate, an adjusting baffle, a buffer module, and a data acquisition module.

[0065] The base is composed of a base plate 1, a screw 2, a nut 3, and a support plate 4.

[0066] The electromagnetic locking device is composed of a lower electromagnetic plate 5, an electromagnet 6, a metal hinge 7, and an upper electromagnetic plate 8, and is located between the base and the telescopic backplate, and is respectively connected by bolts. The lower electromagnetic plate 5 and the upper electromagnetic plate 8 are connected by a metal hinge 7. The metal plate 9 is connected to the upper electromagnetic plate 8 and the lower backplate 10 by bolts.

[0067] The telescopic backplate is composed of a lower backplate 10 and an upper backplate 17 connected by bolts. The upper backplate 17 is located in the chute 12 of the lower backplate 10. The lower backplate 10 is provided with a chute 12, a lower slide rail 13, and a threaded hole 22. The upper backplate 17 is provided with an upper slide rail 18 and a threaded hole 22.

[0068] The adjusting baffle is fixed on the slide rail of the telescopic backplate by bolts. There are three adjusting baffles, namely a lower U-shaped adjusting baffle 11, a middle U-shaped adjusting baffle 15, and an upper U-shaped adjusting baffle 19, which are fixed on the slide rail 13 of the telescopic backplate by bolts, and their positions on the slide rail 13 can be adjusted as needed. One side of the adjusting baffle is provided with an adjusting belt hole 14, and the other end is provided with an adjusting belt 21.

[0069] The buffer module is composed of an upper base 20, a set of disc springs 29, an energy-absorbing sponge 30, a lower base 31, and a bottom plate 32. The back of the upper base 20 is provided with a set of disc springs 28 located on the upper backplate 17. The energy-absorbing sponge 30, the set of disc springs 29, the lower base 31, and the bottom plate 32 are located on the ground. The base is filled with non-Newtonian fluid material.

[0070] The data acquisition module is electrically connected to the electromagnetic locking device through wire 24, and is composed of a switch 25, a display 26, a converter 27, a controller 28, and a sensor 23 provided on the electromagnetic locking device.

[0071] During the test, when the sensor receives an explosive wave with a certain threshold, the converter cuts off the power of the electromagnetic locking device, and the telescopic backboard tilts backward onto the buffer module, and the impact force value of the sensor for the explosive wave can be obtained on the display.

[0072] A rangefinder is provided on the folding rod, which can measure the impact force of explosives at different distances on the explosive disposal equipment as needed.

[0073] The base is filled with non-Newtonian fluid material, which can suppress secondary vibration.

[0074] Energy-absorbing sponges 29 are provided on the telescopic backboard and the adjusting baffle.

[0075] The telescopic backboard can be set into a seat structure, which can be applicable to human targets in different postures.

[0076] An automatic reset module can be provided on the buffer module. After the target tilts, it is automatically reset to the upright state through a pneumatic push rod, supporting continuous tests.

[0077] The working process of the present invention is as follows: Rotate the bottom table, adjust the base to be horizontal, connect the lower electromagnetic plate and the upper electromagnetic plate through bolts with hinges, weld the metal plate to the lower telescopic backboard, connect the electromagnetic locking device to the base and the lower telescopic backboard through bolts respectively, place the upper telescopic backboard in the chute of the lower telescopic backboard according to the height of the simulated human target, and fix it by passing bolts through the threaded holes on the backboard. Install the upper base on the top of the upper telescopic backboard, fix the buffer module on the ground according to the landing position where the fixing device tilts backward, fix the three adjusting baffles on the telescopic backboard through bolts, adjust the position of the adjusting baffle on the slide rail, stretch the adjusting belt through the simulated human target and through the adjusting belt holes, so that the lower U-shaped adjusting baffle fixes the calf of the simulated human target, the middle U-shaped adjusting baffle fixes the waist of the simulated human target, and the upper U-shaped adjusting baffle fixes the head of the simulated human target. During the test, place the gunpowder in a straight position according to the test requirements, turn on the switch of the data acquisition module, set the threshold of the sensor, adjust the converter to make the electromagnets between the lower electromagnetic plate and the upper electromagnetic plate tightly attract. At this time, the fixing device with the simulated human target stands vertically. Adjust the controller to trigger the explosion of the gunpowder. When the sensor reaches the preset threshold, the converter adjusts to cut off the power of the electromagnets between the lower electromagnetic plate and the upper electromagnetic plate. The fixing device tilts backward onto the buffer module on the ground, and the impact force value of the sensor in the simulated human target can be obtained through the data acquisition module. Record the curve collected by the sensor through the display and visually observe the surface damage degree of the simulated human target.

[0078] The present invention has the following embodiments:

[0079] Embodiment 1:

[0080] Referring to Figure 1 、 2 A simulation human target fixing device applicable to dynamic release in an explosion shock environment, which is composed of a base, an electromagnetic locking device, a telescopic backboard, an adjusting baffle, a buffer module and a data acquisition module. The base is composed of a base table 1, a screw 2, a nut 3 and a support plate 4. The electromagnetic locking device is composed of a lower electromagnetic plate 5, an electromagnet 6, a metal hinge 7 and an upper electromagnetic plate 8, and is located between the base and the telescopic backboard, and is respectively connected by bolts. The lower electromagnetic plate 5 and the upper electromagnetic plate 8 are connected by the metal hinge 7. The metal plate 9 is connected to the upper electromagnetic plate 8 and the lower backboard 10 by bolts. The telescopic backboard is composed of a lower backboard 10 and an upper backboard 17 connected by bolts, and the upper backboard 17 is located in the chute 12 of the lower backboard 10. The lower backboard 10 is provided with a chute 12, a lower slide rail 13 and a threaded hole 22. The upper backboard 17 is provided with an upper slide rail 18 and a threaded hole 22. The adjusting baffle is fixed on the slide rail of the telescopic backboard by bolts. There are three adjusting baffles, namely a lower U-shaped adjusting baffle 11, a middle U-shaped adjusting baffle 15 and an upper U-shaped adjusting baffle 19, which are fixed on the slide rail 13 of the telescopic backboard by bolts and can be adjusted according to needs. The position on the slide rail 13. One side of the adjusting baffle is provided with an adjusting belt hole 14, and the other end is provided with an adjusting belt 21. The buffer module is composed of an upper base 20, a disc spring group 29, an energy-absorbing sponge 30, a lower base 31 and a bottom plate 32. The back of the upper base 20 is provided with a disc spring group 28 on the upper backboard 17. The energy-absorbing sponge 30, the disc spring group 29, the lower base 31 and the bottom plate 32 are located on the ground. The data acquisition module is electrically connected to the electromagnetic locking device through a wire 24 and is composed of a switch 25, a display 26, a converter 27, a controller 28 and a sensor 23 arranged on the electromagnetic locking device.

[0081] Embodiment 2:

[0082] The difference between this embodiment and Embodiment 1 is that the base is filled with non-Newtonian fluid material, which can suppress secondary vibration.

[0083] Embodiment 3:

[0084] The difference between this embodiment and Embodiment 1 is that the telescopic backboard and the adjusting baffle are provided with energy-absorbing sponges.

[0085] Embodiment 4:

[0086] The difference between this embodiment and Embodiment 1 is that the telescopic backboard can be set into a seat structure, which is applicable to human targets in different postures.

[0087] Embodiment 5:

[0088] The difference between this embodiment and Embodiment 1 is that an automatic reset module can be provided on the buffer module. After the target is toppled, it can be automatically reset to the upright state by a pneumatic push rod, supporting continuous tests.

[0089] For the specific implementation solution of this embodiment, reference can be made to the relevant descriptions in the above embodiments, which will not be elaborated here.

[0090] It can be understood that the same or similar parts in the above embodiments can be referred to each other, and the content not described in detail in some embodiments can be referred to the same or similar content in other embodiments.

[0091] It should be noted that in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "a plurality of" refers to at least two.

[0092] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0093] The simulated human target fixing device for realizing dynamic release in an explosion shock environment adopting the present invention can reduce costs, simplify processes, provide fixed support for the simulated human target, and has the advantages of simple structure, convenient operation, reliable testing, etc.

[0094] In this specification, the present invention has been described with reference to its specific embodiments. However, it is obvious that various modifications and transformations can still be made without departing from the spirit and scope of the present invention. Therefore, the specification and drawings should be regarded as illustrative rather than restrictive.

Claims

1. A simulated human target fixing device for realizing dynamic release in an explosive impact environment, characterized in that: The device includes a base, an electromagnetic locking device, a telescopic back plate, an adjustment baffle, a buffer module and a data acquisition module. The electromagnetic locking device is located between the base and the telescopic back plate, and the electromagnetic locking device is connected to the base and the telescopic back plate respectively by bolts. The adjustment baffle is fixed to the slide rail of the telescopic back plate by bolts. The buffer module is installed on the ground and behind the telescopic back plate. The data acquisition module is electrically connected to the electromagnetic locking device by wires.

2. The simulated human target fixing device for realizing dynamic release under explosion impact environment according to claim 1 is characterized in that: The base comprises a bottom platform, a screw rod, a nut and a support plate. The screw rod is installed on the bottom of the support plate through the nut, and the bottom platform is installed on the bottom of the screw rod.

3. The simulated human target fixing device for realizing dynamic release under explosion impact environment according to claim 1 is characterized in that: The electromagnetic locking device includes a lower electromagnetic plate, an electromagnet, a metal hinge and an upper electromagnetic plate. The lower electromagnetic plate and the upper electromagnetic plate are connected by a metal hinge. The metal plate is located between the upper electromagnetic plate and the lower back plate, and the metal plate is connected to the upper electromagnetic plate and the lower back plate respectively by bolts.

4. The simulated human target fixing device for realizing dynamic release under explosion impact environment according to claim 1 is characterized in that: The telescopic back panel comprises a lower back panel, a slide groove, a lower slide rail, an upper back panel, an upper slide rail and a threaded hole. The lower back panel and the upper back panel are connected by bolts. The slide groove is installed on the lower back panel. The upper back panel is located in the slide groove of the lower back panel. The lower slide rail is arranged on the lower back panel. The upper slide rail and the threaded hole are arranged on the upper back panel.

5. The simulated human target fixing device for realizing dynamic release under explosion impact environment according to claim 1, characterized in that: The adjustment baffle includes a lower U-shaped adjustment baffle, an adjustment belt hole, a middle U-shaped adjustment baffle, an upper U-shaped adjustment baffle and an adjustment belt. The lower U-shaped adjustment baffle, the middle U-shaped adjustment baffle and the upper U-shaped adjustment baffle are fixed to the slide rail of the telescopic backplane by bolts, and the position of the lower U-shaped adjustment baffle, the middle U-shaped adjustment baffle or the upper U-shaped adjustment baffle on the slide rail supports adjustment; the adjustment belt hole is arranged on one side of the adjustment baffle, and the adjustment belt is arranged on the other side of the adjustment baffle.

6. The simulated human target fixing device for realizing dynamic release under explosion impact environment according to claim 1, characterized in that: The buffer module includes an upper base, a disc spring group, an energy absorbing sponge, a lower base and a bottom plate. The disc spring group is arranged on the back of the upper base and located on the upper back plate. The energy absorbing sponge, disc spring group, lower base and bottom plate are all located on the ground.

7. The simulated human target fixing device for realizing dynamic release under explosion impact environment according to claim 1, characterized in that: The data acquisition module comprises a switch, a display, a converter, a controller and a sensor. The sensor is arranged on the electromagnetic locking device. The switch, the display, the converter and the controller are all connected to the electromagnetic locking device through wires.

8. The simulated human target fixing device for realizing dynamic release under explosion impact environment according to claim 1, characterized in that: The telescopic back plate and the adjusting baffle are provided with energy absorbing sponges.

9. The simulated human target fixing device for realizing dynamic release under explosion impact environment according to claim 1, characterized in that: The buffer module is provided with an automatic reset module, which automatically resets the target to an upright state through a pneumatic push rod after the target falls over.

10. The simulated human target fixing device for realizing dynamic release under explosion shock environment according to claim 1, characterized in that: The telescopic backboard is a seat structure and is suitable for human targets in different postures.

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