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Child safety seat crash test method
1. my country's child safety seats need to undergo a crash test before being marketed. At present, the production of child safety seats in my country needs to pass the crash test to determine whether it meets the safety standards in the 'Child Vehicle Restraint System for Motor Vehicles', which is based on the European ECER44 /04 standard certification based. When consumers buy child safety seats, they should choose brand products that pass this standard to ensure children's driving safety. That is to say, only child safety seats that meet the standards of the 'Child Restraint System for Motor Vehicles' can be sold on the market. 2. What is the basis of the child safety seat crash test The displacement, the acceleration of the chest and the invasion of the abdomen are clearly required to ensure the protection of the child by the safety seat. In the crash test, a 15kg 3-year-old dummy was used, and the speed at the time of the collision was 50km (the car suddenly collided or braked while driving at a speed of 50km/h, and the objects in the car would generate 30-40 times its own weight. Impact force. If the baby is 15kg, the impact force generated by the collision will be 450-600kg). According to the standard, in the event of a frontal collision, the head of the dummy on the child safety seat cannot be displaced by more than 550 mm. The experiment may seem complicated, but in fact, everyone only needs to focus on a few data. 1. The synthetic acceleration of the dummy chest is a 3ms cumulative value, regardless of the complicated name, just remember that if this value is greater than the value specified by the regulations, the human body may become unbearable. 2. The head displacement of the dummy, this displacement regulation also clearly stipulates the limit value, if it exceeds, there is a danger of collision. 3. Experimental environment and tools 1. Introduction to the experimental site The destination of this trip is the key laboratory of China Automotive Technology Research Center. This laboratory can realize multi-angle crash tests at different speeds and simulate actual road traffic more realistically. It is one of the most advanced automobile safety laboratories in the world at present. 2. Introduction of experimental tools 4. Experiment process 1. The first step of installing the car seat experiment is to install the car seat. The above picture shows the crash test laboratory engineer fixing it on the crash test bench“car seat”. Don't underestimate the fixed“car seat”Oh, because only if it is fixed precisely and without error“car seat”In order to get the most accurate data from the crash test, it took about 40 minutes for the on-site engineers to install the seat. The picture above shows the final calibration of the seat installation performed by the test engineer with a laser alignment instrument to ensure the accuracy of the experimental data. 2. Install the child safety seat After the car seat is installed, the engineer fixes the child safety seat on the car seat very carefully. The child safety seat is installed, and the wooden tool above is to make the back of the dummy and the actual child have a certain gap between the seat and the seat. 3. Installation of dummies Some people want to ask how the dummies were transported in such a large truck? ! The answer is yes, because the dummy is a high-precision instrument. Despite its ordinary appearance, his core is quite powerful. The market price of such a child dummy is also around 200,000. Just by looking at the engineer handling the dummy, you will know how heavy this stuff is. The weight of the dummy and the same size child can be the same. Engineers are linking crash test data lines to the dummy to test data such as the dummy's head displacement and chest pressure. 4. Confirm the successful installation of the safety seat and the dummy The engineer installs the dummy on the child safety seat, and confirms the successful installation of the dummy through appearance correction and electronic instrument observation. 5. Test the opening strength of the seat belt. The tester confirms the opening strength of the seat belt. This link is essential. If it is higher than the standard, then this seat is problematic. 6. The official crash test experiment officially started. The entire crash process was very short. The testers used crash instruments to simulate the collision of the vehicle at a speed of 50 km/h from the front. After the collision, the testers check the various data obtained after the collision with the safety seat simulator to check whether they meet the corresponding national standards (that is, whether the test data is within the range of several key data reference indicators introduced earlier) , and draw corresponding conclusions. So far, the experiment has been successfully completed. More about automotive interior testers: http://www.standard-groups.com/MaterialofAutomotive/
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Ball Burst Method (ASTM D3787): Steel ball penetration for textiles/films using testers like GT-C02-2.
Hydraulic Method (ISO 13938.1): Fluid pressure on rubber diaphragm for industrial fabrics via GT-C12A.
Pneumatic Method (ISO 13938.2): Compressed air for breathable materials tested with GT-C12B.
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