Dynamic impact test method and device for aviation child restraint device

Abstract

The present invention provides a dynamic impact test method and device for an aviation child restraint device, including: according to the type of the aviation child restraint device and the test working conditions, using a rigid seat with variable anchor points and additionally installing a suitable seat cushion; checking whether the installation of the aviation child restraint device and the test child dummy meets the test requirements; if so, conducting a dynamic impact test and collecting child dummy parameter data through a sensor group arranged inside the test child dummy; comparing the filtered child dummy parameter data with preset data to obtain a parameter comparison result; calculating the movement trajectories of key positions of the aviation child restraint device and the movement trajectories of key positions of the test child dummy through the Mark marks in the test images collected by a high-speed camera, and comparing them with the limit position requirements to obtain a displacement comparison result; determining the states of the aviation child restraint device and the test child dummy after the test according to the parameter comparison result and the displacement comparison result.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation safety, and particularly to a dynamic impact test method and device for an aviation child restraint device. Background Art

[0002] An aviation seat and its restraint system can protect the safety of occupants, avoid serious injuries to the occupants, and complete subsequent emergency evacuations. However, an aviation seat belt (two-point seat belt) is suitable for adult occupants with fully developed bodies. It is difficult for children with underdeveloped bodies to be effectively restrained by the aviation seat belt and obtain good protection. Therefore, using an aviation child restraint device is a better choice.

[0003] The in-flight aviation child restraint device includes various types of restraint systems, such as additional loop belts, vest-type seat belts, and aviation child restraint devices, etc. If these aviation child restraint devices are to be used on an aircraft, they need to pass strict dynamic impact tests to prove that they meet the airworthiness regulations and standards. Usually, two methods are used to evaluate and verify the aviation child restraint device. One is to use an aviation seat to conduct a dynamic impact test on the aviation child restraint device, and the other is to use a test seat that meets the test standards for the test.

[0004] Using an aviation seat for the test has a high cost and a long cycle time; using a test seat that meets the test standards to conduct a dynamic impact test on the aviation child restraint device, but the test results cannot accurately reflect the performance under the conditions of an aviation seat. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a dynamic impact test method and device for an aviation child restraint device, which has low cost and high efficiency and can meet the test requirements for simulating the aviation seat test of the aviation child restraint device.

[0006] In a first aspect, an embodiment of the present invention provides a dynamic impact test method for an aviation child restraint device, which is tested on a rigid seat with an additional seat cushion. The method includes:

[0007] According to the tested aviation child restraint device and test conditions, use the rigid seat to add a seat cushion with a suitable thickness and material, and change the position of the seat belt anchor point to meet the required test requirements;

[0008] Check whether the installation of the aviation child restraint device and the test child dummy meets the test requirements;

[0009] If so, conduct a dynamic impact test and collect child dummy parameter data through a sensor group arranged inside the test child dummy;

[0010] After filtering the child dummy parameter data, the filtered child dummy parameter data is obtained;

[0011] Compare the filtered child dummy parameter data with the preset data to obtain a parameter comparison result;

[0012] Calculate the movement trajectories of the key positions of the aviation child restraint device and the movement trajectories of the key positions of the test child dummy through the Mark marks in the test images collected by the high-speed camera; wherein, the Mark marks are set at the key positions of the aviation child restraint device and the key positions of the test child dummy;

[0013] Compare the movement trajectories of the key positions of the aviation child restraint device and the movement trajectories of the key positions of the test child dummy with the limit position requirements to obtain a displacement comparison result;

[0014] Determine the states of the aviation child restraint device and the test child dummy after the test according to the parameter comparison result and the displacement comparison result.

[0015] Further, check whether the installation of the aviation child restraint device and the test child dummy meets the test requirements, including:

[0016] Check whether the type of the aviation child restraint device meets the installation requirements in the manual, and whether the test child dummy meets the standard sitting posture requirements.

[0017] Further, the standard sitting posture requirements include:

[0018] When the friction force of the horizontally extended limb joints does not affect the weight of the limbs, the test child dummy is placed at the center position of the aviation child restraint device, the back of the test child dummy leans against the backrest of the aviation child restraint device without gaps, the knee spacing of the test child dummy makes the axial centerlines of the thighs parallel, the hands of the test child dummy are placed on the upper surface of the thighs, and the feet of the test child dummy are placed at positions parallel to the centerlines of the calves.

[0019] Further, the sensor group includes a head acceleration sensor, a neck load sensor, a neck torque sensor, a chest acceleration sensor, and an abdominal pressure sensor; collecting child dummy parameter data through the sensor group arranged in the test child dummy includes:

[0020] Collect head acceleration through the head acceleration sensor, neck load through the neck load sensor, neck torque through the neck torque sensor, chest acceleration through the chest acceleration sensor, and abdominal pressure through the abdominal pressure sensor.

[0021] Further, a first tension sensor is provided on the aviation child restraint device, and a second tension sensor is provided on the aviation safety belt. The method further includes:

[0022] Collecting the pre-tightening force through the first tension sensor and collecting the safety belt tension through the second tension sensor;

[0023] Determining the performance of the aviation child restraint device before the test trial according to the pre-tightening force;

[0024] Determining the change in the tension of the safety belt during the test process according to the safety belt tension.

[0025] Further, before checking whether the installation of the aviation child restraint device and the test child dummy meets the test requirements, the method further includes:

[0026] Determining the type of the aviation child restraint device and the test requirements of the aviation child restraint device;

[0027] Performing a calibration test on the selected test child dummy according to the test requirements of the aviation child restraint device to obtain a test result;

[0028] Testing the mass and center of gravity position of the aviation child restraint device, as well as the mass and center of gravity position of the test child dummy;

[0029] Determining the thickness and material of the seat cushion according to the mass and center of gravity position of the test child dummy.

[0030] Further, performing a calibration test on the selected test child dummy according to the test requirements of the aviation child restraint device to obtain a test result, including:

[0031] Performing a calibration test on the head, neck, lumbar spine, chest, and abdomen of the test child dummy using a drop calibration table, an impact calibration table, and a static compression calibration table according to the test requirements of the aviation child restraint device to obtain the test result.

[0032] In a second aspect, an embodiment of the present invention provides a dynamic impact test device for an aviation child restraint device. The test is performed on a rigid seat with an additional seat cushion. According to the tested aviation child restraint device and test conditions, a seat cushion with a suitable thickness and material is added to the rigid seat, and the position of the safety belt anchor point is changed to meet the required test requirements. The device includes the rigid seat, a sensor group, a high-speed camera, and a calculator;

[0033] The sensor group is used to perform a dynamic impact test and collect child dummy parameter data when the installation of the aviation child restraint device and the test child dummy meets the test requirements;

[0034] The high-speed camera is used to collect the Mark marks in the test images;

[0035] The calculator is used to filter the child dummy parameter data to obtain the filtered child dummy parameter data; compare the filtered child dummy parameter data with the preset data to obtain a parameter comparison result; calculate the movement trajectories of the key positions of the aviation child restraint device and the movement trajectories of the key positions of the test child dummy according to the Mark marks in the test images; wherein, the Mark marks are set at the key positions of the aviation child restraint device and the key positions of the test child dummy; compare the movement trajectories of the key positions of the aviation child restraint device and the movement trajectories of the key positions of the test child dummy with the limit position requirements to obtain a displacement comparison result; determine the states of the aviation child restraint device and the test child dummy after the test according to the parameter comparison result and the displacement comparison result.

[0036] In a third aspect, an embodiment of the present invention provides an electronic device, including a memory and a processor, where a computer program that can run on the processor is stored on the memory, and when the processor executes the computer program, the method described above is implemented.

[0037] In a fourth aspect, an embodiment of the present invention provides a computer-readable medium having non-volatile program code executable by a processor, and the program code causes the processor to execute the method described above.

[0038] An embodiment of the present invention provides a dynamic impact test method and device for an aviation child restraint device. The test is carried out on a rigid seat with an additional seat cushion, including: according to the tested aviation child restraint device and test conditions, using a rigid seat to add a seat cushion with a suitable thickness and material, and changing the seat belt anchor point position to meet the required test requirements; checking whether the installation of the aviation child restraint device and the test child dummy meets the test requirements; if so, conducting a dynamic impact test and collecting child dummy parameter data through a sensor group arranged inside the test child dummy; filtering the child dummy parameter data to obtain the filtered child dummy parameter data; comparing the filtered child dummy parameter data with preset data to obtain a parameter comparison result; calculating the movement trajectories of key positions of the aviation child restraint device and the movement trajectories of key positions of the test child dummy through the Mark marks in the test images collected by a high-speed camera; wherein, the Mark marks are set at the key positions of the aviation child restraint device and the key positions of the test child dummy; comparing the movement trajectories of key positions of the aviation child restraint device and the movement trajectories of key positions of the test child dummy with the limit position requirements to obtain a displacement comparison result; determining the states of the aviation child restraint device and the test child dummy after the test according to the parameter comparison result and the displacement comparison result; with low cost and high efficiency, it can meet the test requirements for simulating the aviation seat test of the aviation child restraint device.

[0039] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention are achieved and obtained by the structures specifically pointed out in the specification, claims, and drawings.

[0040] To make the above objectives, features, and advantages of the present invention more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0042] Figure 1 It is a flowchart of the dynamic impact test method for the aviation child restraint device provided in Embodiment 1 of the present invention;

[0043] Figure 2 It is a structural schematic diagram of the dynamic impact test device for the aviation child restraint device provided in Embodiment 1 of the present invention;

[0044] Figure 3 Schematic diagram of the structure of the aviation child restraint device provided in the first embodiment of the present invention;

[0045] Figure 4 Schematic diagram of the dynamic impact test device of the aviation child restraint device provided in the second embodiment of the present invention;

[0046] Figure 5 Schematic diagram of the comparison of head accelerations provided in the third embodiment of the present invention;

[0047] Figure 6 Schematic diagram of the comparison of neck loads / moments provided in the third embodiment of the present invention;

[0048] Figure 7 Schematic diagram of the comparison of chest accelerations provided in the third embodiment of the present invention;

[0049] Figure 8 Schematic diagram of the simulation model of the aviation child restraint device provided in the third embodiment of the present invention;

[0050] Figure 9 Schematic diagram of the head injury of the Q1.5 dummy provided in the third embodiment of the present invention;

[0051] Figure 10 Schematic diagram of the neck injury of the Q1.5 dummy provided in the third embodiment of the present invention;

[0052] Figure 11 Schematic diagram of the chest injury of the Q1.5 dummy provided in the third embodiment of the present invention;

[0053] Figure 12 Schematic diagram of the head injury of the Q3 dummy provided in the third embodiment of the present invention;

[0054] Figure 13 Schematic diagram of the neck injury of the Q3 dummy provided in the third embodiment of the present invention;

[0055] Figure 14 Schematic diagram of the chest injury of the Q3 dummy provided in the third embodiment of the present invention.

[0056] Icon:

[0057] 1 - Test lighting system; 2 - High - speed camera at the top; 3 - High - speed camera on the left; 4 - Pneumatic actuator; 5 - High - speed camera on the right; 6 - Digital collector; 7 - Calculator; 8 - Structural horizontal impact experiment; 9 - Control system of the structural horizontal impact test bench; 10 - Rigid seat structure; 11 - Aviation child restraint device; 12 - Aviation child dummy; 13 - Seat cushion; 14 - Seat pan sensor; 15 - Backrest sensor; 16 - Aviation safety belt; 17 - Seat belt anchor point. Detailed implementation manners

[0058] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0059] For ease of understanding of this embodiment, the embodiments of the present invention will be introduced in detail below.

[0060] Embodiment 1:

[0061] Figure 1 It is a flowchart of the dynamic impact test method for the aviation child restraint device provided in Embodiment 1 of the present invention.

[0062] Referring to Figure 1 , in this application, the test is carried out on a rigid seat with an additional seat cushion. According to the tested aviation child restraint device and test conditions, a seat cushion with a suitable thickness and material is added to the rigid seat, and the position of the seat belt anchor point is changed to meet the required test requirements. The method includes the following steps:

[0063] Step S101: Check whether the installation of the aviation child restraint device and the test child dummy meets the test requirements;

[0064] Here, the aviation child restraint device refers to a restraint device used to restrain children on civil aircraft. The types of aviation child restraint devices include vest-type seat belts, etc., to ensure that the aviation child restraint device meets the installation requirements on the aviation seat.

[0065] Step S102: If so, conduct a dynamic impact test and collect the parameter data of the child dummy through the sensor group set in the test child dummy;

[0066] Step S103: After filtering the parameter data of the child dummy, obtain the filtered parameter data of the child dummy;

[0067] Step S104: Compare the filtered parameter data of the child dummy with the preset data to obtain a parameter comparison result;

[0068] Step S105: Calculate the movement trajectories of the key positions of the aviation child restraint device and the key positions of the test child dummy through the Mark marks in the test images collected by the high-speed camera; wherein, the Mark marks are set at the key positions of the aviation child restraint device and the key positions of the test child dummy.

[0069] Specifically, referring to Figure 2, including a test lighting system 1, a high-speed camera 2 at the top, a high-speed camera 3 on the left, a pneumatic actuator 4, a high-speed camera 5 on the right, a digital collector 6, a calculator 7, a structural horizontal impact experiment 8, and a control system 9 for the structural horizontal impact test bench. Refer to Figure 3 , including: a rigid seat structure 10, an aviation child restraint device 11, an aviation child dummy 12, a seat cushion 13, a seat pan sensor 14, a seat back sensor 15, an aviation seat belt 16, and a seat belt anchor 17.

[0070] After the sensor group is debugged, connect the digital collector 6 on the sliding table. The digital collector 6 is connected to the calculator 7 to ensure the normal operation conditions of the sensors.

[0071] Post Mark marks at the key positions of the test child dummy and the aviation child restraint device, mainly at the head, knees, and ankles of the child, and at the top and front end of the aviation child restraint device, for the calculator to generate the movement trajectories and maximum displacement distances of the head, knees, ankles of the dummy, and the top and front end of the aviation child restraint device through the test images later, and install a distance identifier on the sliding table as a distance scale.

[0072] Record the images of the test, and use a coordinate measuring machine (measuring X, Y, Z coordinates) to identify the coordinate positions of the aviation child restraint device and the child dummy relative to a certain coordinate position of the rigid seat, which can be used to determine the specific position of a certain part of the dummy relative to a certain place on the seat in subsequent tests or simulation analyses.

[0073] Start the test lighting system 1 to ensure sufficient light within the effective distance of the sliding table. Place three high-speed cameras (the high-speed camera 3 on the left, the high-speed camera 5 on the right, and the high-speed camera 2 at the top) on the left, right, and top of the sliding table, and adjust the distance and angle of the cameras relative to the sliding table to ensure that they can completely record the impact process of the sliding table.

[0074] Move the sliding table until it touches the actuator and unlock the safety. Select the impact pulse according to the test requirements to impact the sliding table system for inflation and electrical measurement debugging, and check the reliability of the brake.

[0075] Step S106, compare the movement trajectories of the key positions of the aviation child restraint device and the movement trajectories of the key positions of the test child dummy with the limit position requirements to obtain the displacement comparison result;

[0076] Step S107, determine the state of the aviation child restraint device after the test and the state of the test child dummy according to the parameter comparison result and the displacement comparison result.

[0077] Specifically, the safety inspector ensures that there is no one around the test area, meets the safety test standards, and issues a test preparation instruction. After the cylinder pressure meets the requirements, the tester sounds an alarm and starts a 30 - second countdown. When the time is up, the launch button is pressed, and the pneumatic actuator (a device that applies an impact to the slide table) impacts the slide table according to a predetermined pulse. The high - speed camera records the video of the test process. The internal sensors of the dummy record the head acceleration, neck load, neck moment, chest acceleration, and abdominal pressure data, and the tension sensor records the change in seat - belt tension.

[0078] The calculator collects the dummy sensor data and filters it according to the SAE J211 standard. Subsequently, it automatically calculates and compares according to the requirements of ECER129 / r4 and FMVSS 208 regulations to determine whether the head, neck, chest, and abdominal injuries meet the regulatory requirements. The seat - belt tension data is used to assist in analyzing the performance of the aviation child restraint device. At the same time, the calculator calculates the movement trajectories of the key positions of the aviation child restraint device and the test child dummy through the marker in the test video recorded by the high - speed camera, and judges whether the test child dummy and the aviation child restraint device meet the displacement limit according to the extreme displacement requirements of SAE AS 5276 / 1.

[0079] Conduct a safety inspection after the test and record the status of the aviation child restraint device and the test child dummy after the test.

[0080] Furthermore, step S101 includes:

[0081] Check whether the type of the aviation child restraint device meets the installation requirements in the specification, and whether the test child dummy meets the standard sitting posture requirements.

[0082] Furthermore, the standard sitting posture requirements include:

[0083] When the friction of the horizontally extended limb joints does not affect the weight of the limbs, the test child dummy is placed at the center position of the aviation child restraint device, the back of the test child dummy leans against the backrest of the aviation child restraint device without gaps, the knee spacing of the test child dummy makes the axial centerlines of the thighs parallel, the hands of the test child dummy are placed on the upper surface of the thighs, and the feet of the test child dummy are placed at positions parallel to the centerlines of the lower legs.

[0084] Furthermore, the sensor group includes a head acceleration sensor, a neck load sensor, a neck moment sensor, a chest acceleration sensor, and an abdominal pressure sensor; step S102 includes:

[0085] Collect head acceleration (in g, the unit of gravity) through a head acceleration sensor, neck load (in N, the unit of force) through a neck load sensor, neck moment (in N*m, the unit of moment) through a neck moment sensor, chest acceleration (in g) through a chest acceleration sensor, and abdominal pressure (in kPa, the unit of pressure) through an abdominal pressure sensor.

[0086] Specifically, in accordance with the regulations of automotive regulation ECE R129 / r4: 1. The HPC (Head Performance Criterion, a calculation formula specified in the regulation) calculated from the head acceleration needs to be less than the value specified in the regulation; 2. The cumulative 3ms chest acceleration (the maximum acceleration value that accumulates to or exceeds 3ms in the data) calculated from the chest acceleration needs to be less than the value specified in the regulation; 3. The maximum abdominal pressure obtained from the abdominal pressure data needs to be less than the value specified in the regulation.

[0087] In accordance with the regulations of automotive regulation FMVSS 208: 1. The neck tensile / compressive load obtained from the neck load data needs to be less than the value specified in the regulation; 2. The Nij (a neck injury value quantitatively calculated through the neck load and moment) calculated from the neck load and neck moment data is required to be less than the value specified in the regulation. (It should be noted that currently in the field of child aviation safety, relevant regulations and experiences in the automotive field need to be referred to, which is why the above are all automotive regulations)

[0088] Furthermore, a first tension sensor is provided on the aviation child restraint device, and a second tension sensor is provided on the aviation seat belt. The method further includes the following steps:

[0089] Step S201, collect the pretension force through the first tension sensor and the seat belt tension through the second tension sensor;

[0090] Step S202, determine the performance of the aviation child restraint device before the test trial according to the pretension force;

[0091] Step S203, determine the change in the seat belt tension during the test trial according to the seat belt tension.

[0092] Furthermore, before step S101, the method further includes the following steps:

[0093] Step S301, determine the type of the aviation child restraint device and the test requirements of the aviation child restraint device;

[0094] Step S302, perform a calibration test on the selected test child dummy according to the test requirements of the aviation child restraint device to obtain the test results;

[0095] Step S303, test the mass and center of gravity position of the aviation child restraint device, as well as the mass and center of gravity position of the test child dummy.

[0096] Step S304, determine the thickness and material of the seat cushion according to the mass and center of gravity position of the test child dummy.

[0097] Further, step S302 includes:

[0098] According to the test requirements of the aviation child restraint device, use a drop calibration table, an impact calibration table, and a static compression calibration table to conduct calibration tests on the head, neck, lumbar spine, chest, and abdomen of the test child dummy to obtain test results.

[0099] Here, according to the usage requirements and tests of the aviation child restraint device, select test child dummies (Q1, Q1.5, Q3, Q6, Q10 dummies), conduct calibration tests on the test child dummies, and require the test results to meet the C-NCAP requirements.

[0100] Determine the thickness and material of the seat cushion according to the mass and center of gravity position of the test child dummy to ensure that the test results can simulate or be more severe than the test results of the aviation seat.

[0101] According to the usage specifications of the aviation child restraint device, install it on a rigid seat, and consider whether to use an aviation seat belt according to specific requirements. For example, if the aviation child restraint device needs to be restrained by an aviation seat belt, the test child dummy is restrained by a five-point seat belt, and the release force of the five-point seat belt is between 40N and 62N; if the child directly uses an aviation seat belt, the pretension force of the aviation seat belt is between 22.2N and 44.4N; if the aviation seat belt restrains the aviation child restraint device, the pretension force should be between 40N and 62N. At the same time, according to the specific test purpose, select different seat belt anchor points to achieve ideal test conditions.

[0102] Through the research, evaluation, and verification of the impact mechanical properties of the in-flight aviation child restraint device, this application replaces the seat cushion and aviation seat belt anchor points according to different types of aviation child restraint devices and the ages of child occupants to simulate the aviation seat working conditions, so as to solve the technical problems of high cost, long research cycle, and large application limitations in the current dynamic impact test of aviation child restraint devices using aviation seats, and avoid the problem of structural differences between a certain test seat and the aviation seat. The test object of this application is clear, with low cost and high efficiency, and can meet the usage requirements of industrial parties and verification institutions.

[0103] Embodiment 2:

[0104] Figure 4 It is a schematic diagram of the dynamic impact test device for the aviation child restraint device provided in Embodiment 2 of the present invention.

[0105] Refer toFigure 4 By conducting tests on a rigid seat with an additional seat cushion, according to the tested aviation child restraint device and test conditions, a seat cushion with an appropriate thickness and material is added to the rigid seat, and the position of the seat belt anchor point is changed to meet the required test requirements; the device includes a rigid seat, a sensor group, a high-speed camera, and a calculator;

[0106] The rigid seat is a seat with a full-metal frame. There is a load sensor behind the seat back and below the seat pan respectively. Multiple anchor points are set at the seat belt anchor point and can be selected according to the test condition requirements. And there is a shoulder belt anchor point on the seat back; the rigid seat is used to install the aviation child restraint device and the test child dummy. According to the type of aviation child device, seat cushions with different thicknesses and materials are selected;

[0107] The sensor group is used to conduct a dynamic impact test and collect the parameter data of the child dummy when the installation of the aviation child restraint device and the test child dummy meets the test requirements;

[0108] The high-speed camera is used to collect the Mark points in the test images;

[0109] The calculator is used to filter the parameter data of the child dummy to obtain the filtered parameter data of the child dummy; compare the filtered parameter data of the child dummy with the preset data to obtain the parameter comparison result; calculate the movement trajectories of the key positions of the aviation child restraint device and the key positions of the test child dummy according to the Mark points in the test images; among them, the Mark points are set at the key positions of the aviation child restraint device and the key positions of the test child dummy; compare the movement trajectories of the key positions of the aviation child restraint device and the key positions of the test child dummy with the limit position requirements to obtain the displacement comparison result; determine the state of the aviation child restraint device and the state of the test child dummy after the test according to the parameter comparison result and the displacement comparison result.

[0110] Example three:

[0111] Based on the rigid seat test, a coupling model is established, which mainly consists of a rigid seat, a CARES seat belt, and a Q1.5 dummy. After setting the contact, materials, pulses, etc., the calculated data is compared with the test data of the rigid seat and the aviation seat (the rigid seat test did not add a seat cushion), as Figures 5 to 7 shown. The results prove that the simulation degree of the rigid seat coupling model is good and can simulate the dynamic response under normal restraint. Among them, Figure 6 (a) is the Z-direction neck load, Figure 6 (b) is the Y-direction neck load. Figure 8 (a) is a schematic diagram of the simulation model of the vest-type aviation child restraint device, Figure 8 (b) is a schematic diagram of the simulation model of the five-point aviation child restraint device.

[0112] After the model was effectively verified, two types of seat cushions were added to the rigid seat pan for simulation, namely the seat cushion of a certain aviation seat (abbreviated as seat cushion A) and the seat cushion of a certain test seat (abbreviated as seat cushion B). The length, width and height of seat cushion B are 457×483mm, with a thickness of 101.7mm at the front end and 125mm at the rear end. The length, width and height of seat cushion A are 490×480×80mm. The rigid seat was equipped with seat cushion A and seat cushion B, and was given double-layer (polyurethane and polyethylene) or single-layer polyurethane AF60 material for horizontal impact simulation of the aviation child restraint device. As Figures 9 to 11 shown, the comparison results of the dummy's head, neck and chest show that the simulation results of the rigid seat equipped with seat cushion A and seat cushion B have a good contrast with the test results of the aviation seat, or a higher severity. If the seat cushion is replaced with a softer polyurethane AF60 material, the simulation results are more severe than the test. Figure 9 (a) is the resultant head acceleration of the Q1.5 dummy, Figure 9 (b) is the HIC15 and cumulative 3ms head acceleration of the Q1.5 dummy; Figure 10 (a) is the Z-direction neck load of the Q1.5 dummy, Figure 10 (b) is the Y-direction neck moment of the Q1.5 dummy, Figure 10 (c) is the Nij value; Figure 11 (a) is the resultant chest acceleration of the Q1.5 dummy, Figure 11 (b) is the cumulative 3ms chest acceleration of the Q1.5 dummy.

[0113] Through the horizontal impact simulation of the aviation child restraint device and comparison with the test results of the aviation seat, the results show that it is feasible to conduct the dynamic impact test of the aviation child restraint device by adding seat cushions to the rigid seat. As Figures 12 to 14 shown, Figure 12 (a) is the resultant head acceleration of the Q3 dummy, Figure 12 (b) is the HIC15 and cumulative 3ms head acceleration of the Q3 dummy; Figure 13 (a) is the Z-direction neck load of the Q3 dummy, Figure 13 (b) is the Y-direction neck moment of the Q3 dummy, Figure 13 (c) is the Nij value; Figure 14 (a) is the resultant chest acceleration of the Q3 dummy, Figure 14 (b) is the cumulative 3ms chest acceleration of the Q3 dummy.

[0114] An embodiment of the present invention also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the dynamic impact test method of the aviation child restraint device provided in the above embodiment.

[0115] An embodiment of the present invention further provides a computer-readable medium having non-volatile program code executable by a processor. A computer program is stored on the computer-readable medium. When the computer program is run by the processor, it executes the steps of the dynamic impact test method of the aviation child restraint device in the above embodiment.

[0116] The computer program product provided by the embodiment of the present invention includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the method described in the foregoing method embodiments. For specific implementation, reference can be made to the method embodiments and will not be elaborated herein.

[0117] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described systems and devices can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0118] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0119] If the above function is implemented in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or a part of this technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program code.

[0120] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0121] Finally, it should be noted that the above-described embodiments are only specific embodiments of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any person skilled in the art within the technical scope disclosed by the present invention can still modify the technical solutions described in the foregoing embodiments, or can easily conceive of changes, or make equivalent replacements for some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A dynamic impact test method for an aviation child restraint device, characterized in that, By conducting tests on a rigid seat with an additional seat cushion, the method includes: According to the tested aviation child restraint device and test conditions, use the rigid seat to add a seat cushion with a suitable thickness and material, and change the position of the seat belt anchor point to meet the required test requirements; Check whether the installation of the aviation child restraint device and the test child dummy meets the test requirements; If so, conduct a dynamic impact test and collect child dummy parameter data through a sensor group set inside the test child dummy; After filtering the child dummy parameter data, obtain the filtered child dummy parameter data; Compare the filtered child dummy parameter data with preset data to obtain a parameter comparison result; Calculate the movement trajectories of the key positions of the aviation child restraint device and the key positions of the test child dummy through the Mark marks in the test images collected by a high-speed camera; wherein, the Mark marks are set at the key positions of the aviation child restraint device and the key positions of the test child dummy; Compare the movement trajectories of the key positions of the aviation child restraint device and the key positions of the test child dummy with the limit position requirements to obtain a displacement comparison result; Determine the states of the aviation child restraint device and the test child dummy after the test according to the parameter comparison result and the displacement comparison result; The sensor group includes a head acceleration sensor, a neck load sensor, a neck moment sensor, a chest acceleration sensor, and an abdominal pressure sensor; collecting child dummy parameter data through the sensor group set inside the test child dummy includes: Collecting head acceleration through the head acceleration sensor, neck load through the neck load sensor, neck moment through the neck moment sensor, chest acceleration through the chest acceleration sensor, and abdominal pressure through the abdominal pressure sensor; A first tension sensor is provided on the aviation child restraint device, and a second tension sensor is provided on the aviation seat belt. The method further includes: Collecting the pre-tightening force through the first tension sensor and the seat belt tension through the second tension sensor; Determine the performance of the aviation child restraint device before the test according to the pre-tightening force; Determine the change in the tension of the seat belt during the test according to the seat belt tension.

2. The dynamic impact test method of the aviation child restraint device according to claim 1, characterized in that Checking whether the installation of the aviation child restraint device and the test child dummy meets the test requirements includes: Checking whether the type of the aviation child restraint device meets the installation requirements in the specification, and whether the test child dummy meets the standard sitting posture requirements.

3. The dynamic impact test method for the aviation child restraint device according to claim 2, characterized in that The standard sitting posture requirements include: When the friction force of the horizontally extended limb joints does not affect the weight of the limbs, the test child dummy is placed at the center position of the aviation child restraint device, the back of the test child dummy leans against the backrest of the aviation child restraint device without gaps, the knee spacing of the test child dummy makes the axial centerlines of the thighs parallel, the hands of the test child dummy are placed on the upper surface of the thighs, and the feet of the test child dummy are placed at positions parallel to the centerlines of the lower legs.

4. The dynamic impact test method for the aviation child restraint device according to claim 1, characterized in that, Before checking whether the installation of the aviation child restraint device and the test child dummy meets the test requirements, the method further includes: Determining the type of the aviation child restraint device and the test requirements of the aviation child restraint device; Performing a calibration test on the selected test child dummy according to the test requirements of the aviation child restraint device to obtain a test result; Testing the mass and center of gravity position of the aviation child restraint device, and the mass and center of gravity position of the test child dummy; Determining the thickness and material of the seat cushion according to the mass and center of gravity position of the test child dummy.

5. The dynamic impact test method for the aviation child restraint device according to claim 4, wherein, Performing a calibration test on the selected test child dummy according to the test requirements of the aviation child restraint device to obtain a test result, including: Performing a calibration test on the head, neck, lumbar spine, chest and abdomen of the test child dummy using a drop calibration table, an impact calibration table and a static compression calibration table according to the test requirements of the aviation child restraint device to obtain the test result.

6. A dynamic impact test device for an aviation child restraint device, characterized in that, By performing a test on a rigid seat with an additional seat cushion, according to the tested aviation child restraint device and test conditions, using the rigid seat to add a seat cushion with a suitable thickness and material, and changing the seat belt anchor point position to meet the required test requirements; the device includes the rigid seat, a sensor group, a high-speed camera and a calculator; The sensor group is used to perform a dynamic impact test and collect child dummy parameter data when the installation of the aviation child restraint device and the test child dummy meets the test requirements; The high-speed camera is used to collect the Mark marks in the test images; The calculator is used to filter the child dummy parameter data to obtain the filtered child dummy parameter data; compare the filtered child dummy parameter data with preset data to obtain a parameter comparison result; calculate the movement trajectories of the key positions of the aviation child restraint device and the movement trajectories of the key positions of the test child dummy according to the Mark marks in the test images; wherein, the Mark marks are set at the key positions of the aviation child restraint device and the key positions of the test child dummy; compare the movement trajectories of the key positions of the aviation child restraint device and the movement trajectories of the key positions of the test child dummy with the limit position requirements to obtain a displacement comparison result; determine the state of the aviation child restraint device and the state of the test child dummy after the test according to the parameter comparison result and the displacement comparison result; The sensor group includes a head acceleration sensor, a neck load sensor, a neck moment sensor, a chest acceleration sensor and an abdominal pressure sensor; the sensor group is specifically used for: Collecting head acceleration through the head acceleration sensor, neck load through the neck load sensor, neck moment through the neck moment sensor, chest acceleration through the chest acceleration sensor and abdominal pressure through the abdominal pressure sensor; A first tension sensor is provided on the aviation child restraint device, and a second tension sensor is provided on the aviation seat belt. The device further includes: Collect the pre-tightening force through the first tension sensor and the seat belt tension through the second tension sensor; Determine the performance of the aviation child restraint device before the test according to the pre-tightening force; Determine the change in the seat belt tension during the test according to the seat belt tension.

7. An electronic device, comprising a memory and a processor, wherein a computer program capable of running on the processor is stored on the memory, characterized in that When the processor executes the computer program, it implements the method described in any one of claims 1 to 5 above.

8. A computer-readable medium having non-volatile program code executable by a processor, characterized in that, The program code causes the processor to execute the method described in any one of claims 1 to 5.

Images