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

Abstract

The application relates to a mounting basket for a vehicle seat anti-explosion impact drop test and a design method, wherein the mounting basket comprises a main body part and a suction top cap; the suction top cap is fixed on the main body part through bolt connection and is used for connecting a release lock on the top of a drop test rack in a drop test device; the main body part of the mounting basket is in a cuboid structure formed by a force-bearing beam group; the main body part of the mounting basket is provided with a seat mounting plate interface at the top, the back and the side, so that the seat mounting plate can be bolt-connected according to needs; mounting holes are reserved on the seat mounting plate and are used for mounting the seat; at least eight groups of guide wheel assemblies are mounted around the main body part of the mounting basket and are respectively in contact with four columns around a drop test rack in a drop test device; a bottom impact plate is mounted at the bottom of the main body part of the mounting basket; a counterweight mounting hole is reserved on the front upper surface of the bottom impact plate and is used for mounting a counterweight according to needs, so as to balance the problem of the rear movement of the gravity center caused after the seat is mounted.

Description

Technical Field

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

[0002] In some application scenarios, vehicles face the threat of landmines 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 thus protect 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] Drawing on research experience with helicopter crash-resistant seats and combined with international experience in simulating explosive shock processes through bench testing, we conducted drop tests to investigate and verify the seat's blast-resistance performance. The results obtained closely matched those from live explosion tests. Drop testing is an intuitive, effective, low-cost, and repeatable testing method. Therefore, drop testing is a common method used to investigate the blast-resistance performance of lightning-resistant seats during prototype development and performance optimization.

[0005] The research on the explosion resistance of lightning protection seats is carried out by drop test, usually in a 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 generator 3, and a high-speed camera 4. The drop test bench 1 is provided with a release lock on the top and has four columns 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 with a dummy in the seat. The explosion shock waveform generator 3 is arranged below the installation basket 2. The high-speed camera 4 is arranged on one side of the explosion shock waveform generator 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 generator 3 in a state of approximate free fall. The explosion shock waveform generator 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 adjusts the input pulse waveform according to the required test input conditions. The waveform curve of the impact acceleration is used as the criterion for judging the success of the simulation waveform. The high-speed camera 4 records the movement of the installation basket 2 and the seat, including the time trajectory of displacement, velocity, acceleration, etc., for later calculations.

[0006] During the drop test of a seat's explosion-resistant impact performance, the installation of the hanging basket 2 is related to the seat-dummy system constraints, the seat's installation status in the vehicle body, and the simulation of the impact load. Therefore, the design of the hanging basket 2 is of great significance to the accuracy of the test impact load simulation and is crucial to the success of the test and the accuracy of the test results.

[0007] When designing the installation 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 on the vehicle. At the same time, various conditions such as the cost and test conditions of the test should be considered to provide a basis and convenience for the seat's explosion resistance to impact performance test. In view of the existence of the above-mentioned technical defects, this application is filed. 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 basket for a vehicle seat explosion-resistant impact drop test is provided, comprising a main body and a suction cap;

[0011] The holding cap is fixed to the main body by bolt connection and is used to connect to 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 seat mounting plate interfaces reserved on the top, back and sides so that the seat mounting plates can be connected with bolts as needed. Mounting holes are reserved on the seat mounting plates for seat installation.

[0014] At least 8 sets of guide wheel assemblies are installed around the main part 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 part of the hanging basket, and a counterweight mounting 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 as the upper end.

[0017] Optionally, in the above-mentioned mounting basket for the explosion impact drop test of the vehicle seat, 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 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 basket for the explosion impact drop test of the vehicle seat, a movable roller is detachably installed under the bottom impact plate.

[0020] On the other hand, a method for designing a mounting 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 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 equations 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 dummy The initial displacement value x2(0) is as follows:

[0028]

[0029] in:

[0030] V s0The speed at which the installation basket falls and hits the explosion shock waveform generator, completing the loading of the triangular wave pulse; V0 is the speed of the seat and dummy when the falling system just contacts 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 system of first-order differential equations for solution;

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

[0033] The mass of the falling system mass block, which basically does not change with 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 installation basket is solved.

[0034] Optionally, in the above-mentioned method for designing a mounting 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 100 kg.

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

[0037] Provided is a mounting 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 for 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 performance of the seats;

[0039] The obtained 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 hanging basket and repeated replacement during testing;

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

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

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

[0043] Figure 3 This is a partial schematic diagram of the main body of a mounting basket for a vehicle seat explosion impact drop test provided by an embodiment of the present application;

[0044] Figure 4 Schematic diagram of the principle model of the installation basket-seat / dummy falling system provided in an embodiment of the present application;

[0045] Figure 5 This 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 an 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 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 this 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 understood as limiting this application. DETAILED DESCRIPTION

[0050] To make the technical solution and its advantages of this application more clear, the technical solution of this application will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described here are only some of the embodiments of this application and are only used to explain this application, not to limit this application. It should be noted that for ease of description, only the parts relevant to this application are shown in the accompanying drawings, and other relevant 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 should have the usual meanings understood by those skilled in the art in the field to which this application belongs. The words indicating orientation used in the description of this application 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 means 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 stipulated 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 basket for a vehicle seat explosion impact drop test is designed to be easy to install, easy to replace, and versatile during the test. The mounting basket is designed to include 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 formation of the input load waveform and the constraint guidance 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 cap 22 are fixed together by bolts. With this two-part design, the suction cap 22 can be removed during the test installation and connected after the installation is completed. This can avoid interference between the top suction connection and the seat installation interface 26, and also facilitate the lifting of the dummy.

[0056] The main part 21 of the installation basket is a cubic structure composed of load-bearing beams 27. The load-bearing beams 27 are composed of square and rectangular tube steel that meet the load requirements. 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 on them so that the seat mounting plate 20 can be connected with bolts as needed to meet the installation requirements of the seat mounting plate 20. Mounting holes are reserved on the seat mounting plate 20 for the installation of 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 gondola is equipped with a reinforcement rod 28 to ensure the strength and rigidity of the main body 21. The reinforcement rod 28 is installed in 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 fit between the guide wheel assembly 25 and the column. In addition, the design of the reinforcement rod 28 should take into account the measurement of the seat cushion travel to avoid obstruction during non-contact cushion travel measurement.

[0060] A bottom impact plate 23 is welded or screwed to the bottom of the main body 21 of the hanging basket. This plate accounts for the vast majority of the total weight of the hanging basket, ensuring data consistency and stability during the drop test. During the drop test, the plate 23 collides vertically with the explosive shock waveform generator 3 in the drop test apparatus, simulating the explosive shock wave. A counterweight mounting hole 29 is reserved at the front of the plate 23 for installing a counterweight as needed to compensate for the rearward shift in the center of gravity caused by the seat's installation.

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

[0062] The vehicle seat blast drop test mounting basket disclosed in the above embodiment features universal compatibility with various seats, convenient test installation, accurate reflection of seat installation status, and accurate test load simulation. It provides a foundation for testing seat blast drop performance and underpins 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, during structural design, it is necessary to always pay attention to the weight of the entire falling system, 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 system consisting of the installation basket, seat, and dummy is simplified, and the principle model of the installation basket-seat / dummy falling system is constructed. The falling system is considered as a mass block without the seat and dummy, including the basket and counterweight, and the seat and dummy are considered as another mass block. The two are connected by the seat buffer. The stiffness system and damping coefficient of the buffer are k S and c S .

[0067] Installation principle model of the basket-seat / dummy drop system, such as Figure 3 As shown, 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 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 upward and positive, so 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 system is determined by analysis and calculation. Initial displacement value x1(0), initial velocity value of the mass block composed of the seat and dummy The value of the initial displacement x2(0) is used as the initial condition to solve the motion equation 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 a rebound will occur. The mass block composed of the seat and the dummy will continue to move downward due to inertia, acting 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 Initial displacement value x1(0).

[0077] Initial value of the velocity of the mass block of the falling system Take the installation basket falling and touching the explosion shock waveform generator to complete the loading of the triangle 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. 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 velocity value of the mass block composed of the seat and the dummy The initial displacement value is x2(0).

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

[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 equations of the hanging basket-seat / dummy falling system are reduced to a set of first-order differential equations for solution. New variables p and q are introduced, and the initial values ​​are transformed accordingly to form the following first-order differential equations:

[0089]

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

[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 77 kg and the mass of the seat is mostly between 20 kg and 28 kg, the mass m2 of the mass block composed of the seat and the dummy is generally not greater than 100 kg, and m2 = 100 kg can be taken.

[0093] The weight of the falling system is mainly achieved through the installation of the hanging basket design. In theory, 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] Under conditions below the actual vehicle weight, the mass m1 of the falling body mass block was varied to analyze its impact on the test results. The acceleration of the seat and dummy mass block, representing the vertical acceleration response at the human pelvis, was plotted for analysis of weight selection.

[0095] Different values ​​of the falling mass m1 significantly influence the response acceleration of the seat and dummy mass. The closer the value is to the actual vehicle mass, the closer the calculated results are to the reference curve. However, after the mass m1 of the falling mass reaches a certain value, the calculated results have little effect on the response acceleration of the seat and dummy mass. Furthermore, the acceleration response of the dummy's pelvis, calculated from the response acceleration of the seat and dummy mass, exhibits the same pattern of variation.

[0096] The mass of the falling system mass, whose response to the acceleration of the seat and dummy mass is essentially unchanged, is used as the value of the falling system mass m1, and the mass of the mounting basket is then solved. This ensures that the difference between the experimental results and the actual results of the vertical acceleration response at the human pelvis is within 3%, and more realistically reflects the seat's blast impact resistance through laboratory drop testing.

[0097] The above-mentioned embodiment discloses a mounting hanging basket and a design method for a vehicle seat explosion-resistant impact drop test, and a drop test is performed on the seat to verify the explosion-resistant impact performance of the seat, as shown below.

[0098] 1. Lightning protection installation hanging basket design

[0099] Based on the loading and actual waveform requirements of the installation basket during the test, the drop velocity and drop height of the installation basket during impact were calculated. The theoretical waveform of the loading was used to establish the principle model of the installation basket-seat / dummy drop system. Theoretical analysis and modeling were performed based on the requirement that the error in the seat assessment should not exceed 3%. The weight of the drop system was determined. The weight of the drop system includes the weight of the two main components of the installation basket, the weight of the counterweight, the weight of the seat, and the weight of the dummy. Subtracting the weight of other components, the required design weight of the installation basket 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. According to the installation needs, the seat mounting plate interface is reserved, and the design and distribution of the reinforcement support rod are completed. After the main part design is completed, the design of the guide wheel assembly and the suction cap are completed according to the internal space of the test bench. The distribution position of the counterweight mounting hole of the bottom impact plate must be considered so that the center of gravity position after the counterweight block is installed is projected at the center position of the bottom impact plate. The movable roller is designed 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 seat and dummy

[0102] First, hoist the main unit and install movable rollers beneath the bottom impact plate to facilitate movement. Before the test installation, the seat must be installed externally. First, install the seat mounting plate. Once the seat mounting plate is complete, install the seat onto the mounting plate. After the seat is installed and adjusted, ensure the seat is in its true condition. Then, hoist the dummy from above the main unit to complete its placement. Use the hoisting suction cap to bolt it to the main unit. Once installed, move the installation basket and insert it into the drop test apparatus. Use the movable rollers to adjust the basket's position so it's centered within the apparatus. Install the guide wheel assembly and adjust the clearance with the columns. Install counterweights in the counterweight mounting holes on the bottom impact plate to maintain the center of gravity. After installation, use the lifting system to raise the basket frame, test its smoothness, and fine-tune the clearance of the guide wheel assembly. Once the basket is raised, remove the movable rollers, and the drop test can begin.

[0103] 3. Formal Test

[0104] During the test, the explosion shock waveform was loaded by installing a hanging basket to assess the seat's resistance to explosion shock. During the test, appropriate test locations were selected on the installation basket as the test and evaluation benchmarks for the impact load. First, the test location for the explosion shock waveform was selected, and the center position of the upper surface of the bottom impact plate was selected as the test point, which was also the assessment location for the input shock waveform. In addition, some test points could 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 their consistency and verify the design stiffness of the installation basket. If it remains consistent, it means that its stiffness can meet the test requirements. 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 can be replaced. To facilitate the seat replacement, the bolts that install 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. This allows the dummy to be hoisted from the space above the main part. The seat and even the seat mounting plate are then removed, replaced with a new seat mounting plate, and the new seat is installed. After completing the seat installation, dummy placement, and suction cap installation 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 design method for a vehicle seat explosion impact resistance drop test, which quantitatively provide the weight and structural design of the installation basket, making the simulation results of the explosion impact loaded onto the seat simulated by the drop test device more accurate, and can effectively simulate the explosion impact resistance process of the seat through the drop test method, and can effectively avoid the problems of under-assessment and over-assessment of the explosion impact resistance performance caused by the randomly designed installation basket during the test process, and can ensure the authenticity of the test data.

[0107] The above-mentioned embodiments disclose a mounting basket and design method for blast-shock drop tests on vehicle seats. The method is applicable to studying the blast-shock performance of seats with various mounting types. Seats can be easily replaced during testing, and the same mounting basket can be used for multiple, repeated tests on different seats. This greatly minimizes the need to replace the mounting basket during testing, facilitating the conduct of testing. Furthermore, the weight of the designed mounting basket can be minimized while ensuring test accuracy and input load consistency, minimizing the weight of the mounting basket and saving testing costs.

[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 hanging baskets, but can also be applied to the design of falling systems for other drop tests, and used for the installation of seats and the design of test installation hanging baskets. Therefore, 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 replacements to the relevant technical features, and the technical solutions after these changes or replacements will fall within the scope of protection of the present application.

Claims

1. A mounting basket for a vehicle seat explosion-resistant impact drop test, characterized in that: It comprises a main body (21) and a suction cap (22); The holding top cap (22) is fixed to the main body (21) by bolt connection and is used to connect to the release lock on the top of the drop test bench (1) in the drop test device; The main body (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 installing 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 at 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 basket for the vehicle seat explosion-resistant shock drop test according to claim 1, characterized in that: The release lock on the top of the drop test bench (1) in the drop test device is in the form of a suction top cap (22), and the upper end of the suction top cap (22) is a suction panel or a lock tongue.

3. The mounting basket for vehicle seat explosion-resistant shock drop test according to claim 1, characterized in that: The main body (21) of the hanging basket is provided with a reinforcing strut (28) to ensure the strength and rigidity of the main body (21).

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

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

6. A method for designing a mounting 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 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 equations 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 dummy The initial displacement value x2(0) is as follows: in: V s0 The speed at which the installation basket falls and hits the explosion shock waveform generator, completing the loading of the triangular wave pulse; V0 is the speed of the seat and dummy when the falling system just contacts 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 system of first-order differential equations for solution; Below the actual weight of the vehicle, plot the acceleration of the mass block composed of the seat and dummy for different falling system masses m1; The mass of the falling system mass block, which basically does not change with 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 installation basket is solved.

7. The method for designing a mounting 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 100 kg.

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