Installation hanging basket for anti-explosion impact drop test of vehicle seat and design method

Abstract

The invention relates to an installation hanging basket for a vehicle seat anti-explosion impact drop test and a design method, and the installation hanging basket comprises a main body part and a suction top cap. The holding top cap is connected and fixed on the main body part through a bolt and is used for connecting a release lock at the top of a drop test bench in the drop test device; the main body part for mounting the hanging basket is of a cubic structure consisting of bearing beams; seat mounting plate interfaces are reserved on the top, the back and the side parts of the main body part of the mounting hanging basket, so that a seat mounting plate can be connected through bolts according to requirements, and mounting holes are reserved in the seat mounting plate and are used for mounting a seat; at least eight groups of guide wheel assemblies are mounted around the main body part of the mounting hanging basket and are respectively in contact with four upright posts around a drop test stand in the drop test device; a bottom surface impact plate is mounted at the bottom of the main body part of the mounting hanging basket, and a counterweight mounting hole is reserved in the front of the upper surface of the bottom surface impact plate and used for mounting a counterweight block according to needs, so that the problem of backward movement of the gravity center after the seat is mounted can be solved.

Description

Technical Field

[0001] The present application belongs to the technical field of design of explosion-resistant impact drop test for vehicle seats, and specifically relates to a mounting hanging basket and a design method for explosion-resistant impact drop test for vehicle seats. Background Art

[0002] In some application scenarios, vehicles face the threat of mines and improvised explosive devices while moving. For this reason, the seats in the vehicle are designed as mine-proof seats with buffers as the last barrier to protect the passengers.

[0003] Lightning-proof seats use buffers to reduce the transmission of explosion shock waves and provide protection for passengers. During the prototype development and performance optimization stage, an intuitive, effective, low-cost, and repeatable test method is needed to study its anti-explosion impact performance.

[0004] Based on the research experience of helicopter crash-resistant seats and the experience of foreign countries in simulating explosion impact processes through bench tests, the drop test was used to study and verify the explosion impact resistance of the seats. The results obtained were very close to the actual explosion test results. The drop test is an intuitive, effective, low-cost and repeatable test method. Therefore, in the development and performance optimization stage of the lightning protection seat prototype, the drop test method is usually used to study its explosion impact resistance.

[0005] The drop test method is used to study the explosion impact resistance of lightning protection seats. Usually, a test chamber is built in the laboratory. Figure 1 The drop test device shown in the figure includes a drop test bench 1, an installation basket 2, an explosion shock waveform generating device 3, and a high-speed camera 4, wherein a release lock is arranged on the top of the drop test bench 1, and four columns are arranged around it. The release lock can be an electromagnetic lock or a mechanical lock; the top of the installation basket 2 is connected to the release lock, and is connected to the four columns through a guide wheel assembly for installing a seat, and a dummy is attached to the seat; the explosion shock waveform generating device 3 is arranged below the installation basket 2; and the high-speed camera 4 is arranged on one side of the explosion shock waveform generating device 3. During the test, the installation basket 2 is released by releasing the lock, so that the installation basket 2 with the seat hits the explosion shock waveform generating device 3 in a state of approximate free fall, and the explosion shock waveform generating device 3 generates an approximate triangular wave with a pulse width of 5ms-7ms and an amplitude of 200g-220g to simulate the impact acceleration during the explosion of landmines and improvised explosive devices, or adjust the input pulse waveform according to the required test input conditions, and use the waveform curve of the impact acceleration as the criterion for judging the success of the simulation waveform, and record the movement of the installation basket 2 and the seat with the high-speed camera 4, including the time trajectory of displacement, velocity, acceleration, etc., for later calculation.

[0006] In the drop test of seat anti-explosion impact performance, the installation of hanging basket 2 is related to the system constraints of seat-dummy, the installation status of the seat in the vehicle body and the simulation of impact load. Therefore, the design of the installation of hanging basket 2 is of great significance to the evaluation of the accuracy of test impact load simulation, and is very important to the success of the test and the accuracy of the test results.

[0007] When designing the mounting basket 2, full consideration should be given to the convenience of seat installation, the authenticity of the seat-dummy system constraints, and the accuracy of the impact load simulation. It should be able to truly simulate the installation status of different seats in the vehicle, and also truly reflect the explosion impact load to which the vehicle is subjected. At the same time, various constraints such as the test cost and test conditions should be considered to provide a basis and convenience for the seat explosion resistance impact performance test. In view of the above-mentioned technical defects, this application is proposed. Summary of the invention

[0008] The purpose of this application is to provide a mounting basket and design method for a vehicle seat explosion impact drop test, to provide a basis and convenience for the seat explosion impact performance test, and to ensure the success of the test and the accuracy of the test results.

[0009] The technical solution of this application is:

[0010] On the one hand, a mounting hanging basket for a vehicle seat explosion-proof impact drop test is provided, comprising a main body and a suction top cap;

[0011] The suction top cap is fixed to the main body by bolt connection and is used to connect the release lock on the top of the drop test bench in the drop test device;

[0012] The main part of the installation basket is a cubic structure composed of load-bearing beams;

[0013] The main part of the installation basket has reserved seat mounting plate interfaces at the top, back and sides so that the seat mounting plate can be connected with bolts as needed. Mounting holes are reserved on the seat mounting plate for the installation of seats.

[0014] At least 8 sets of guide wheel assemblies are installed around the main body of the installation basket, which are respectively in contact with the four columns around the drop test bench in the drop test device;

[0015] A bottom impact plate is installed at the bottom of the main body of the hanging basket, and a counterweight installation hole is reserved in the front of the bottom impact plate for installing a counterweight block as needed to balance the rearward shift of the center of gravity caused by the installation of the seat.

[0016] Optionally, in the above-mentioned vehicle seat explosion-resistant impact drop test mounting basket, the release lock on the top of the drop test bench in the drop test device is in the form of a suction top cap with a suction panel or a lock tongue at the upper end.

[0017] Optionally, in the above-mentioned mounting basket for the vehicle seat explosion impact drop test, a reinforcing support rod is provided on the main part of the mounting basket to ensure the strength and rigidity of the main part.

[0018] Optionally, in the above-mentioned mounting basket for the explosion-resistant impact drop test of the vehicle seat, a bottom impact plate is installed on the bottom of the main body of the mounting basket by welding or screwing.

[0019] Optionally, in the above-mentioned mounting hanging basket for the explosion-resistant impact drop test of the vehicle seat, a movable roller is detachably mounted below the bottom impact plate.

[0020] On the other hand, a method for designing a mounting hanging basket for a vehicle seat explosion impact drop test is provided, comprising:

[0021] Determine the weight of the installation basket, specifically:

[0022] Step 1: Construct the motion equation for the hanging basket-seat / dummy falling system:

[0023]

[0024] Where m1 is the mass of the falling system excluding the mass block of the seat and the dummy, and m2 is the mass of the mass block composed of the seat and the dummy; k S is the stiffness coefficient of the seat buffer; c S is the damping coefficient of the seat buffer; F(t) is the force between the mass block of the falling system, the seat and the mass block composed of the dummy; x1(t) is the acceleration, velocity and displacement of the mass block of the falling system; x2(t) is the acceleration, velocity and displacement of the mass block composed of the seat and the dummy

[0025] Step 2: Determine the initial conditions for the motion equation of the hanging basket-seat / dummy falling system:

[0026] The moment when the simulated explosion impact triangle wave loading is completed is defined as the initial moment;

[0027] At the initial moment, the initial value of the velocity of the mass block of the falling system is Initial displacement value x1(0), initial velocity value of the mass block composed of the seat and the dummy The initial displacement value x2(0) is as follows:

[0028]

[0029] in:

[0030] V s0It is the speed at which the installation basket falls and touches the explosion shock waveform generator to complete the loading of the triangular wave pulse; V0 is the speed of the seat and the dummy when the falling system just touches the explosion shock waveform generator and obtains the triangular wave loading;

[0031] Step 3: Reduce the order of the motion equation of the hanging basket-seat / dummy falling system to a first-order differential equation system for solution;

[0032] Below the actual weight of the vehicle, plot the acceleration of the mass block composed of the seat and the dummy under different mass m1 of the falling system mass block;

[0033] The mass of the falling system mass block, which is basically unchanged by the response acceleration of the mass block composed of the seat and the dummy, is taken as the value of the mass m1 of the falling system mass block, and then the mass of the installed hanging basket is solved.

[0034] Optionally, in the above-mentioned method for designing a mounting hanging basket for a vehicle seat explosion impact drop test, in step 3, the first-order differential equation system is solved by the Runge-Kutta method, the Adams method or the Newmark-β method;

[0035] The mass m2 of the mass block composed of the seat and the dummy is taken as 100kg.

[0036] This application has at least the following beneficial technical effects:

[0037] Provided is a mounting hanging basket and design method for a vehicle seat explosion impact drop test, which can bring the following beneficial technical effects:

[0038] Make the explosion impact drop test of seats more refined and accurate, avoid the randomness of test results caused by the random design and installation of the hanging basket, and avoid over-assessment or under-assessment of the explosion impact resistance of seats;

[0039] The obtained installation hanging basket is universal and can be applied to seats of different installation types, which can effectively reduce the workload caused by repeated design of the installation hanging basket and repeated replacement in the test;

[0040] Under the premise of ensuring the test effect, the weight of the installation basket can be reduced as much as possible, and the best test effect can be achieved by using the least material, which can effectively save the test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a schematic diagram of a vehicle seat explosion impact drop test device provided by the present application;

[0042] Figure 2 This is a schematic diagram of a mounting hanging basket for a vehicle seat explosion-proof impact drop test provided in an embodiment of the present application;

[0043] Figure 3 It is a partial schematic diagram of the main part of the mounting hanging basket for the explosion-resistant impact drop test of the vehicle seat provided in the embodiment of the present application;

[0044] Figure 4 It is a schematic diagram of a principle model of installing a hanging basket-seat / dummy falling system provided in an embodiment of the present application;

[0045] Figure 5 It is a simplified diagram of the mechanical model of the mass block composed of the seat and the dummy at the initial moment provided by the embodiment of the present application;

[0046] in:

[0047] 1- Drop test bench; 2- Installation basket; 3- Explosion shock waveform generator; 4- High-speed camera;

[0048] 20-seat mounting plate; 21-main body; 22-suction top cap; 23-bottom impact plate; 24-moving roller; 25-guide wheel assembly; 26-seat mounting plate interface; 27-load-bearing beam; 28-reinforcement support rod; 29-counterweight mounting hole.

[0049] In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. In addition, the drawings are only used for illustrative purposes and should not be construed as limitations on the present application. DETAILED DESCRIPTION

[0050] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be described in further detail in detail and in detail with reference to the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design.

[0051] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application shall have the usual meanings understood by those of ordinary skill in the art to which this application belongs. The words used in the description of this application to indicate orientation are only used to indicate relative directions or positional relationships. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. The word "include" used in the description of this application indicates that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but does not exclude other elements or objects.

[0052] In addition, it should be noted that, unless otherwise clearly specified and limited, the words "installation", "connection" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Technical personnel in the field can understand its specific meaning in this application according to the specific circumstances.

[0053] A mounting hanging basket for a vehicle seat anti-explosion impact drop test is designed to be easy to install, easy to replace and versatile during the test. The mounting hanging basket includes a main body 21 and a suction cap 22. Figure 2 shown.

[0054] The main body 21 is used for the installation of the seat and its dummy, as well as for the impact to form the input load waveform and the constraint guide during the falling process. The holding top cap 22 is used to connect the release lock on the top of the drop test bench 1 in the drop test device. Considering the form and structure of the release lock, the upper end of the holding top cap 22 is designed to be a corresponding connection form, which is a holding panel or a lock tongue.

[0055] The main body 21 of the hanging basket and the suction top cap 22 are fixed by bolts. With this two-part design, the suction top cap 22 can be removed during test installation and connected after installation. This can avoid interference between the top suction connection and the seat installation interface 26, and also facilitate the hanging of the dummy.

[0056] The main part 21 of the installation basket is a cubic structure composed of load-bearing beams 27, and the load-bearing beams 27 are composed of square and rectangular tube profile steel that meets the load requirements, such as Figure 3 shown.

[0057] The main part 21 of the installation basket has some load-bearing beams 27 added to the top, back and sides, and seat mounting plate interfaces 26 are reserved thereon to be able to connect the seat mounting plate 20 with bolts as needed to meet the installation of the seat mounting plate 20. Mounting holes are reserved on the seat mounting plate 20 for installing seats. The arrangement of the mounting holes is consistent with the installation method of the seats in the vehicle, ensuring that the seat installation is consistent with the actual state. With this design, the installation basket can be suitable for seats with various connection forms. In the test, it can adapt to various seats by only replacing the seat mounting plate 20, which can avoid the workload of replacing the installation basket and repeatedly debugging the waveform.

[0058] Eight sets of guide wheel assemblies 25 are installed around the main body 21 of the hanging basket, which are respectively in contact with four columns around the drop test bench 1 in the drop test device to restrain the drop process.

[0059] The main body 21 of the hanging basket is provided with a reinforcing support rod 28 to ensure the strength and rigidity of the main body 21. The reinforcing support rod 28 is installed at a position where there is no seat mounting plate interface 26, and the installation position of the guide wheel assembly 25 must be fully considered to ensure the matching of the guide wheel assembly 25 and the column. In addition, the design of the reinforcing support rod 28 must take into account the measurement of the seat buffer stroke to avoid obstruction when the buffer stroke is measured by non-contact.

[0060] The bottom of the main body 21 of the installation basket is installed with a bottom impact plate 23 by welding or screwing. The mass of the bottom impact plate 23 accounts for the vast majority of the total weight of the installation basket to ensure the consistency of the data during the test and the stability of the drop process. During the drop test, the bottom impact plate 23 collides vertically with the explosion shock waveform generating device 3 in the drop test device to simulate the explosion shock wave. The front of the bottom impact plate 23 is reserved with a counterweight installation hole 29 for installing a counterweight block as needed to balance the problem of the center of gravity shifting backwards caused by the installation of the seat.

[0061] A movable roller 24 with sufficient strength is detachably installed below the bottom impact plate 23 to facilitate the ground movement of the hanging basket and the position adjustment during installation. When performing a drop test, the movable roller 24 is removed.

[0062] The mounting hanging basket for the vehicle seat anti-explosion impact drop test disclosed in the above embodiment has the characteristics of being universal for various seats, convenient for test installation, truly reflecting the seat installation status, and accurately simulating the test load, etc. It can provide a basis for testing the anti-explosion impact performance of seats and provide a basic guarantee for the improvement and maturity of seat drop test methods.

[0063] When designing the installation basket, it is necessary to determine the weight, design size, installation form, etc., and design the connection interface according to the structural form of the seat. Finally, complete the auxiliary connection design according to the structure of the drop test device.

[0064] Since the weight of the installed hanging basket is very important to the test results and has a crucial impact on the success or failure of the test assessment, the weight of the entire falling system should be always paid attention to during structural design, including the weight of the installed hanging basket, seats, dummies, etc. After determining the weight of the falling system, the weight of the installed hanging basket can be obtained by removing the weight of the seats and dummies.

[0065] Based on the above, an embodiment of the present application provides a method for designing an installation basket for a vehicle seat anti-explosion impact drop test. First, the weight of the installation basket is determined. Second, under the weight constraint of the installation basket, the structure of the installation basket is designed. When designing the structure of the installation basket, specific reference may be made to the above description of the installation basket for a vehicle seat anti-explosion impact drop test. For determining the weight of the installation basket, specific reference may be made to the following.

[0066] The falling body system consisting of the installation basket, seat, and dummy is simplified, and the principle model of the installation basket-seat / dummy falling body system is constructed. The falling body system is considered as a mass block without the seat and dummy, including the basket and the counterweight, and the seat and dummy are considered as another mass block. The two are connected through the seat buffer. The stiffness system and damping coefficient of the buffer are k S and c S .

[0067] Installation of the principle model of the basket-seat / dummy drop system, such as Figure 3 As shown, m1 is the mass of the falling system minus the mass block of the seat and the dummy, and m2 is the mass of the mass block composed of the seat and the dummy; k S is the stiffness coefficient of the seat buffer; c S is the damping coefficient of the seat buffer; F(t) is the force between the mass block of the falling system, the seat and the mass block composed of the dummy.

[0068] The principle model of the installation basket-seat / dummy falling system can be further simplified into a single-degree-of-freedom vibration damping system. The directions of velocity, displacement, and acceleration are positive, and the motion equation of the installation basket-seat / dummy falling system can be obtained as follows:

[0069]

[0070] in,

[0071] x1(t) is the acceleration, velocity and displacement of the mass block of the falling system;

[0072] x2(t) is the acceleration, velocity and displacement of the mass block consisting of the seat and the dummy.

[0073] To solve the equations of motion for the basket-seat / dummy fall system, it is necessary to determine the initial conditions.

[0074] The moment when the simulated explosion impact triangle wave loading is completed is defined as the initial moment, and the initial value of the velocity of the mass block of the falling body system is determined by analysis and calculation. Initial displacement value x1(0), initial velocity value of the mass block composed of the seat and the dummy The value of the initial displacement x2(0) is used as the initial condition to solve the equation of motion of the hanging basket-seat / dummy falling system.

[0075] The installation basket falls and touches the explosion shock waveform generator, completing the loading of the triangular wave pulse. This is the initial moment, and then there will be a rebound. The mass block composed of the seat and the dummy will continue to move downward due to inertia, which will act on the seat's buffer. At the initial moment, the mechanical model diagram is as follows Figure 5 shown.

[0076] Analyze the initial value of the velocity of the mass block in the falling system The initial displacement value is x1(0).

[0077] Initial value of velocity of mass block in falling system Take the installation basket falling and touching the explosion shock waveform generating device to complete the loading of the triangular wave pulse at a speed V s0 In order to reduce the amount of calculation in theoretical analysis, the standard triangle wave is used for calculation, and the middle value of the acceleration pulse amplitude definition range and the middle value of the pulse width definition range are taken, and then:

[0078] V s0 = loaded pulse width of triangular wave pulse × loaded peak value of triangular wave pulse × 9.80665 × 0.5.

[0079] At the initial moment, the falling body system is still in contact with the explosion shock waveform generating device and has not yet bounced upward, so the initial displacement value x1(0) is 0.

[0080] Analyze the initial value of the velocity of the mass block composed of the seat and the dummy The initial displacement value is x2(0).

[0081] The initial value of the velocity of the mass block composed of the seat and the dummy Take the speed V0 of the seat and dummy when the falling body system just contacts the explosion shock waveform generator and obtains the triangular wave loading. When the falling body system just contacts the explosion shock waveform generator and obtains the triangular wave loading, the seat buffer has not yet begun to absorb energy. The mass block composed of the seat and the dummy is in a downward movement state as the falling body system falls. Its speed at the initial moment can be determined by the falling height. The theoretical value of the falling height is determined, and the falling height is independent of the mass of the falling body system mass block. There is:

[0082]

[0083] in,

[0084] g is the acceleration due to gravity, and h is the height from which the falling system falls.

[0085] At the initial moment, since the seat's buffer has not yet started to work, the mass block composed of the seat and the dummy has not produced any displacement, so the initial displacement value x2(0) is 0.

[0086] At this point, the initial conditions for solving the equation of motion for the hanging basket-seat / dummy falling system are obtained:

[0087]

[0088] The motion equation of the installation basket-seat / dummy falling system is reduced to a first-order differential equation system for solution, and new variables p and q are introduced, and the initial values ​​are transformed accordingly to become a first-order differential equation system as follows:

[0089]

[0090] After the first-order ordinary differential equations after the motion equations of the installation basket-seat / dummy falling system are transformed, they can be directly solved by numerical methods such as Runge-Kutta method, Adams method, Newmark-β method, etc.

[0091] According to the theoretical model of the hanging basket-seat / dummy falling system, the influence of the change of the mass m1 of the falling system mass block and the mass m2 of the seat and dummy on the test results is analyzed.

[0092] The mass m2 of the mass block composed of the seat and the dummy is basically a fixed value. Since the mass of the 50th percentile Hybrid III male is 77kg and the mass of the seat is mostly between 20kg and 28kg, the mass m2 of the mass block composed of the seat and the dummy is generally not greater than 100kg, and m2=100kg can be taken.

[0093] The weight of the falling system is mainly achieved through the installation of the hanging basket design. Theoretically, the mass m1 of the falling system mass block should be close to the actual mass of the vehicle. However, considering the hardware capabilities and test costs of the test system, the falling system cannot reach this actual weight in the test.

[0094] Below the actual weight of the vehicle, take different values ​​for the mass m1 of the falling system mass block, and analyze the influence of different mass m1 of the falling system mass block on the test results. Under different mass m1 of the falling system mass block, the acceleration of the mass block composed of the seat and the dummy is regarded as the vertical acceleration response curve of the human pelvis, and the selection of weight is analyzed.

[0095] The mass m1 of the mass block of the falling body system has a great influence on the response acceleration of the mass block composed of the seat and the dummy. The closer it is to the actual mass of the vehicle, the closer the calculation result is to the reference curve. However, when the mass m1 of the mass block of the falling body system reaches a certain mass, the calculation result has little effect on the response acceleration of the mass block composed of the seat and the dummy. At the same time, the acceleration response at the dummy's pelvis is solved by the response acceleration of the mass block composed of the seat and the dummy, and the same change law is observed.

[0096] The mass of the falling system mass block, which has basically no change in the response acceleration of the mass block composed of the seat and the dummy, is used as the value of the mass m1 of the falling system mass block, and then the mass of the installation basket is solved. In this way, the difference between the test result and the actual result of the vertical acceleration response at the human pelvis is guaranteed to be within 3%, and the explosion resistance performance of the seat can be more realistically reflected through the laboratory drop test method.

[0097] The installation hanging basket and design method for the explosion impact resistance drop test of the vehicle seat disclosed in the above embodiment are used to carry out a drop test on the seat to verify the explosion impact resistance performance of the seat, which can be referred to as follows.

[0098] 1. Lightning protection installation hanging basket design

[0099] According to the requirements of the test, the loading and actual waveform of the installation basket are calculated to solve the falling speed and drop height of the installation basket during impact. The principle model of the installation basket-seat / dummy falling system is established through the loaded theoretical waveform. According to the requirement that the error of the seat assessment is no more than 3%, theoretical analysis and modeling are carried out to obtain the weight of the falling system. The weight of the falling system includes the weight of the two main parts of the installation basket, the weight of the counterweight, the weight of the seat, the weight of the dummy, etc. Subtracting the weight of other parts, the weight of the installation basket that needs to be designed can be obtained.

[0100] After obtaining the weight of the installation basket, the installation basket is designed. It is necessary to consider the actual installation space size of the seat, the size of the column space, etc., to determine the design size of the installation basket, reserve the seat mounting plate interface according to the installation needs, and complete the design and distribution of the reinforcement support rod. After the main part design is completed, the guide wheel assembly design and the suction cap design are completed according to the internal space of the test bench. The distribution position of the counterweight installation hole of the bottom impact plate should be considered so that the center of gravity position after the counterweight block is installed is projected at the center of the bottom impact plate. Design the moving roller according to the weight to ensure that the frame can be loaded.

[0101] 2. Installation of hanging basket, installation of drop test device, and installation of seats and dummies

[0102] First, hoist the main part and install the moving roller under the bottom impact plate to facilitate the movement of the main part. Before the test installation, the seat needs to be installed externally. First, install the seat mounting plate. After completing the seat mounting plate, install the seat on the seat mounting plate. After completing the installation and adjustment of the seat, ensure that the seat is in a real state. By hoisting, hoist the dummy from the top of the main part to complete the placement of the dummy. Through the hoisting suction cap, connect it to the main part with bolts. After the installation is completed, push the installation basket to move and push it into the drop test device. Adjust the placement position of the installation basket by moving the roller so that it is in the center of the drop test device. Install the guide wheel assembly and adjust the gap with the column. Install the counterweight in the counterweight installation hole of the bottom impact plate to ensure the center of gravity. After installation, lift the installation basket frame through the lifting system, debug its smoothness, and fine-tune the gap of the guide wheel assembly. After the installation basket is lifted, remove the moving roller, and then the drop test can be carried out.

[0103] 3. Formal Test

[0104] In the test, the explosion shock waveform is loaded by installing the hanging basket to assess the explosion shock resistance of the seat. During the test, an appropriate test position is selected on the installation hanging basket as the test and evaluation benchmark for the impact load. First, the test position of the explosion shock waveform is selected, and the center position of the upper surface of the bottom impact plate is selected as the test point, as the assessment position of the input shock waveform. In addition, some test points can also be selected on the load-bearing beam and the seat mounting plate to test the vertical impact acceleration and compare it with the input shock waveform to compare its consistency and check the design stiffness of the installation hanging basket. If it remains consistent, it means that its stiffness can meet the needs of the test. Otherwise, the load-bearing beam or mounting plate with obvious vibration should be strengthened.

[0105] After completing the test of a certain type of seat, the seat is replaced. In order to facilitate the replacement of the seat, the bolts for installing the main part of the hanging basket and the suction cap can be disconnected, and the suction cap can be lifted up through the lifting system, so that the dummy can be hoisted from the space above the main part, and then the seat and even the seat mounting plate can be removed, and a new seat mounting plate can be replaced, and a new seat can be installed. After completing the installation of the seat, placement of the dummy and installation of the suction cap through the above seat installation methods, the test of another type of seat can be carried out.

[0106] The above-mentioned embodiments disclose an installation basket and a design method for an anti-explosion impact drop test of a vehicle seat, which quantitatively provide the weight and structural design of the installation basket, so that the simulation result of the explosion impact loaded onto the seat by the drop test device is more accurate, and the seat anti-explosion impact process can be effectively simulated by the drop test method, which can effectively avoid the problems of under-assessment and over-assessment of the anti-explosion impact performance caused by the randomly designed installation basket during the test, and can ensure the authenticity of the test data.

[0107] The mounting hanging basket and design method for the explosion impact drop test of vehicle seats disclosed in the above embodiments are suitable for the study of the explosion impact performance of seats of various installation types. The seats can be easily replaced during the test. The same mounting hanging basket can be used for multiple and repeated tests on different seats, which can greatly reduce the problem of replacing the mounting hanging basket during the test and is conducive to the conduct of the test. In addition, the weight of the design mounting hanging basket can be minimized while ensuring the accuracy of the test and the consistency of the input load, and the weight of the mounting hanging basket can be reduced as much as possible to save the test cost.

[0108] Finally, this patent provides a universal and effective drop test falling system design method, which is not only used in the design of lightning protection installation baskets, but also in the design of falling systems for other drop tests, and can be used for the installation of seats and the design of test installation baskets, so this method has good versatility and portability.

[0109] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the scope of protection of the present application.

Claims

1. A mounting hanging basket for a vehicle seat explosion impact drop test, characterized in that: It comprises a main body (21) and a suction cap (22); The suction top cap (22) is fixed to the main body (21) by bolt connection and is used to connect to the release lock at the top of the drop test bench (1) in the drop test device; The main part (21) of the installation hanging basket is a cubic structure composed of load-bearing beams (27); The main body (21) of the installation basket is provided with seat mounting plate interfaces (26) at the top, back and sides so that the seat mounting plate (20) can be connected with bolts as needed. The seat mounting plate (20) is provided with mounting holes for the installation of the seat; At least eight sets of guide wheel assemblies (25) are installed around the main body (21) of the hanging basket, and are respectively in contact with four columns around the drop test bench (1) in the drop test device; A bottom impact plate (23) is installed at the bottom of the main body (21) of the hanging basket, and a counterweight installation hole (29) is reserved in the front of the bottom impact plate (23) for installing a counterweight block as needed to balance the problem of the center of gravity shifting backwards caused by the installation of the seat.

2. The mounting hanging basket for the vehicle seat explosion-proof impact drop test according to claim 1, characterized in that: The release lock at the top of the drop test bench (1) in the drop test device is in the form of a suction top cap (22) having an upper end which is a suction panel or a lock tongue.

3. The mounting hanging basket for the vehicle seat explosion-proof impact drop test according to claim 1, characterized in that: A reinforcing support rod (28) is arranged on the main body (21) of the installation basket to ensure the strength and rigidity of the main body (21).

4. The mounting hanging basket for the vehicle seat explosion-proof impact drop test according to claim 1, characterized in that: A bottom impact plate (23) is installed at the bottom of the main body (21) of the installation basket by welding or screwing.

5. The mounting hanging basket for the vehicle seat explosion-proof impact drop test according to claim 1, characterized in that: A moving roller (24) is detachably mounted below the bottom impact plate (23).

6. A method for designing a mounting hanging basket for a vehicle seat explosion impact drop test, characterized in that: include: Determine the weight of the installation basket, specifically: Step 1: Construct the motion equation for the hanging basket-seat / dummy falling system: Where m1 is the mass of the falling system excluding the mass block of the seat and the dummy, and m2 is the mass of the mass block composed of the seat and the dummy; k S is the stiffness coefficient of the seat buffer; c S is the damping coefficient of the seat buffer; F(t) is the force between the mass block of the falling system, the seat and the mass block composed of the dummy; x1(t) is the acceleration, velocity and displacement of the mass block of the falling system; x2(t) is the acceleration, velocity and displacement of the mass block composed of the seat and the dummy Step 2: Determine the initial conditions for the motion equation of the hanging basket-seat / dummy falling system: The moment when the simulated explosion impact triangle wave loading is completed is defined as the initial moment; At the initial moment, the initial value of the velocity of the mass block of the falling system is Initial displacement value x1(0), initial velocity value of the mass block composed of the seat and the dummy The initial displacement value x2(0) is as follows: in: V s0 It is the speed at which the installation basket falls and touches the explosion shock waveform generator to complete the loading of the triangular wave pulse; V0 is the speed of the seat and the dummy when the falling system just touches the explosion shock waveform generator and obtains the triangular wave loading; Step 3: Reduce the order of the motion equation of the hanging basket-seat / dummy falling system to a first-order differential equation system for solution; Below the actual weight of the vehicle, plot the acceleration of the mass block composed of the seat and the dummy under different mass m1 of the falling system mass block; The mass of the falling system mass block, which is basically unchanged by the response acceleration of the mass block composed of the seat and the dummy, is taken as the value of the mass m1 of the falling system mass block, and then the mass of the installed hanging basket is solved.

7. The design method of a mounting hanging basket for a vehicle seat explosion-resistant impact drop test according to claim 6, characterized in that: In step 3, the first-order differential equations are solved by the Runge-Kutta method, the Adams method or the Newmark-β method; The mass m2 of the mass block composed of the seat and the dummy is taken as 100kg.

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