Research On The Lateral Impact Of The Child Restraint System Based On R129

The new regulation R129 for CRS was issued by Economic Commission for Europe on August, 2013, which would replace the current regulation R44 in three years since then. In China, the national standard Restraining Devices for Child Occupants of Powerdriven Vehicles is almost the same with R44, so the standard will certainly be the same with R129 in a few years. In R129, the most obvious change is the addition of the evaluation criterion of the lateral impact sled test of the child restraint system. Based above, the related research is imperative.Due to the calculation of the velocity pulse demanded by R129, we acquire the range of the value and the pulse width of the deceleration. According to the comparison of different kinds of deceleration devices, we can find that the PU tubes for rear impact covers the range of the value and the pulse width of the lateral impact. In this article, we finally get the method of getting the velocity pulse through trying several combinations by using different amount of PU tubes, diameter of the olive-shaped knobs and initial velocities, which meets the demand of the regulation perfectly and steady. So there is no need to redesign the particular deceleration device for lateral impact.Meanwhile the whole lateral impact sled test system is established, including the demanded bench, the door panel, and the removable lower ISOFIX fixing points. The standard lateral impact sled test is made by using the system with Q dummy. On the basis of the dynamic process and the injury data, we find that the area and the stiffness of the headrest of the CRS are among the key points to reduce the displacement and the peak acceleration of the dummy head.This article also works on the simulations of the lateral impact. The tension tests are made to get the material characteristics of the frame structure of the CRS and the child belts. We establish the whole model of the lateral impact sled test by scanning the frame structure, recreating the geometry surfaces, dividing the finite element grids, and building MADYMO models. The dynamic process and the injury data of the simulation are both very similar to the sled test. Using the model, we verify the protection of the headrest of the CRS in the different conditions that with or without the headrest.This article is the basic research of the lateral impact of child restraint system, in which the whole sled test system is established and verified, and the simulations work is carried out. It lays the foundation for the future research of the lateral impact protection of the CRS.