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| Simulation and Analysis of Folding Airbag Deployment Process |
| Received:July 15, 2024 Revised:September 30, 2024 |
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| DOI：10.7643/issn.1672-9242.2024.12.005 |
| KeyWord:folding airbag underwater mass velocity gas replenishment process folding modeling finite element model |
| Author | Institution |
| WANG Xiaoqi |
School of Mechanical and Electrical Engineering, North University of China, Taiyuan , China |
| WANG Gang |
School of Mechanical and Electrical Engineering, North University of China, Taiyuan , China |
| ZHANG Bingnan |
School of Mechanical and Electrical Engineering, North University of China, Taiyuan , China |
| GAO Ziyang |
School of Mechanical and Electrical Engineering, North University of China, Taiyuan , China |
| XU Guorun |
School of Mechanical and Electrical Engineering, North University of China, Taiyuan , China |
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| Abstract: |
| The work aims to study the dynamic characteristic behavior of folding airbag in underwater inflatable deployment of mine-manipulating floating device. According to the thermodynamic theorem, a mass flow calculation model was constructed, and the gas mass flow curve at the inlet of the airbag was obtained. Through the finite element analysis software LS-DYNA, the control volume (CV) method was used to consider the external pressure difference caused by different water depths. The simulation analysis of the deployment process of the folding airbag was carried out. With the increase of underwater depth, under the same other conditions, the initial rate of gas mass inflow in the airbag decreased, the pressure drop rate inside the cylinder slowed down, and the inflation time was prolonged accordingly, which was 0.008 s on land and 1.392 1 s at 100 m underwater. At the same water depth, the smaller diameter of the pipeline would lead to a decrease in the mass flow rate of the gas flowing into the airbag, thereby significantly increasing the time required to reach the working pressure. That for 4 mm diameter was 0.365 7 s, and that for the 12 mm diameter was 0.040 6 s. In the initial stage of inflation, the pressure of the multi-folded airbag changed sharply, and the maximum pressure peak was 0.447 MPa, which was close to the working pressure of 0.452 MPa. The whole inflation process is divided into three stages:the initial stage, the middle stage and the later stage. The initial folding state of the airbag has the greatest influence on the initial stage. The simulation results show that the relationship between the time required for the airbag to fully unfold and the path is an exponential function. |
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