Research On The Method Of Simulating The Blasting Test Of Airbag

Airbag has been used widely as an effective s upple menta l restra int s yste m ofpassive safety, its performance has also been concerned more. In the R&D process ofairbag and releva nt components, a large number of airbag blasting tests wereconducted to study airbag deployment shape, folded pattern, or structure’s strengthand covers property. To comp lete these tests, in genera l, a lot of inflators will becons umed, whic h will result in high cost and environme nta l pollution. Therefore, it isnecessary to seek for an economica l and safe method to replace the inflators toconduct a irbag blasting tests.Currently, so me research on the alternative a irbag inflator methodology wasdone at home and abroad, and the corresponding test devices were a lso deve loped.These devices, however, could not reach the require ments of the test regulations orwere too expensive. Therefore, according to the test regulations of airbag, a method ofcompress ing gas to replace the real inflators was used to develop a test device tosimulate the blasting test of a irbag.This test device of s imulating the b lasting test of airbag was divided into threeparts, the deployment device, the calibration device and the measureme nt and contro lsystem. The dep loyment device was the direct power source of a irbag dep loyment,and the structure a nd functio n of each co mponent of this device was detailedlydescribed. The dyna mic process of the compressed gas deplo ying the airbag wasanalyzed, and the working pressure needed to expand the airbag in the required timewas calculated. The strength and tightness of the deployment device was alsoguaranteed by analys is us ing ANSYS. To replace inflators to conduct airbag blastingtest, the test device should copied the P-t curve of the inflator tank test first, there forea calibratio n device was designed to demarcate the output curve of the deployme ntdevice. The Fluent software was used to analyze the effect of the tank shape of theca libration device on the P-t curve inside the tank, and then two types of theca libration device were designed with the different tank vo lume of60L and28.3L byus ing the structure with the flat joint of both ends. The measureme nt and controlsystem was developed based on the virtua l instrume nt LabVIEW platform, whichinc luded hardware design and software design. Then the technical ind icators of thedata acquis itio n card and the sensors were detailed and the interface was comp lied to take the test control and data acquisition work easily. Two groups of different types ofairbag were used to simulate the blasting test, the test results demo nstrated that thistest device could inflate the a irbag rapid ly a nd accurately, and the effectiveness andaccuracy of the method was also validated. F ina lly, the dyna mic deformation of theairbag hous ing under the impact ge nerated by airbag blasting was analyzed. Themecha nical properties of the aluminum allo y of the ho us ing and the accuracy of threekinds of materia l models characterizing this aluminum allo y were studied, whichcould provide some reference for airbag deve lopers.