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Numerical Simulation Research on Airbag Working Process

Author: ChengHan
Tutor: YuLi
School: Nanjing University of Aeronautics and Astronautics
Course: Machine and Environmental Engineering
Keywords: Gasbag Buffering Inflation Process CV France ALE method Finite Element Analysis
CLC: V244.11
Type: Master's thesis
Year: 2009
Downloads: 198
Quote: 1
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Abstract


Airbags are widely used in aerospace , marine, automotive and other emerging fields. General balloon design is mainly based on empirical formulas and physical experiments , the traditional method requires a lot of manpower and material resources , and the cycle is long, some important data collection is not comprehensive. As computer hardware and software , the rapid development of numerical simulation aided design research possible . Based on LS-DYNA finite element analysis software, airbag working process simulation. Mainly to complete the following several aspects: ( 1 ) using the control volume method ( abbreviated CV method , Control Volume) on a practical engineering applications - UAV cushion airbag simulate entire work process , get balloon capsule pressure , velocity, overload changes . ( 2 ) using the arbitrary Lagrangian - Eulerian ( ALE method referred to , Arbitrary Lagrangian-Eulerian) fluid-structure interaction simulation of airbag inflation process , access to the inflatable balloon shape and course of the dynamic relationship between the flow field ; ( 3 ) using the CV method to simulate the process of the airbag inflator , balloon shape and intraluminal pressure obtained and the results were compared and ALE method . The results show that: for the airbag cushion as other practical engineering applications , due to the need for airbags dimensions, parameters such as the exhaust port area a lot of analog comparator , CV method to calculate speed, short cycle. Although the CV method is simple, but the balloon inflated for high-speed process , the capsule can not be obtained , and the transient flow field surface of the expanded airbag details ALE method established the feasibility of the simulation of the airbag inflator . In short, both CV method or ALE method for assisting balloon design to reduce the number of tests is important.

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CLC: > Aviation, aerospace > Aviation > Aircraft instrumentation,avionics, flight control and navigation > Protection, life - saving equipment and technology > Protective equipment > Anti-collision device
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