Validation of underwater explosion response analysis for airbag inflator using a fluid-structure interaction algorithm
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Air gun shock systems are commonly used as alternative explosion energy sources for underwater explosion (UNDEX) shock tests owing to their low cost and environmental impact. The airbag inflator of automotive airbag systems is also very useful to generate extremely rapid underwater gas release in labscale tests. To overcome the restrictions on the very small computational time step owing to the very fine fluid mesh around the nozzle hole in the explicit integration algorithm, and also the absence of a commercial solver and software for gas UNDEX of airbag inflator, an idealized airbag inflator and fluid mesh modeling technique was developed using nozzle holes of relatively large size and several small TNT charges instead of gas inside the airbag inflator. The objective of this study is to validate the results of an UNDEX response analysis of one and two idealized airbag inflators by comparison with the results of shock tests in a small water tank. This comparison was performed using the multi-material Arbitrary Lagrangian-Eulerian formulation and fluid-structure interaction algorithm. The number, size, vertical distance from the nozzle outlet, detonation velocity, and lighting times of small TNT charges were determined. Through mesh size convergence tests, the UNDEX response analysis and idealized airbag inflator modeling were validated.
Abstract
Air gun shock systems are commonly used as alternative explosion energy sources for underwater explosion (UNDEX) shock tests owing to their low cost and environmental impact. The airbag inflator of automotive airbag systems is also very useful to generate extremely rapid underwater gas release in labscale tests. To overcome the restrictions on the very small computational time step owing to the very fine fluid mesh around the nozzle hole in the explicit integration algorithm, and also the absence of a commercial solver and software for gas UNDEX of airbag inflator, an idealized airbag inflator and fluid mesh modeling technique was developed using nozzle holes of relatively large size and several small TNT charges instead of gas inside the airbag inflator. The objective of this study is to validate the results of an UNDEX response analysis of one and two idealized airbag inflators by comparison with the results of shock tests in a small water tank. This comparison was performed using the multi-material Arbitrary Lagrangian-Eulerian formulation and fluid-structure interaction algorithm. The number, size, vertical distance from the nozzle outlet, detonation velocity, and lighting times of small TNT charges were determined. Through mesh size convergence tests, the UNDEX response analysis and idealized airbag inflator modeling were validated.
참고문헌 (15)
- Aquelet, N., "EulereLagrange coupling with damping effects: application to slamming problems", Comput. Methods Appl. Mech. Eng., 195, pp.110~132 (2006)
- Barras, G., "Numerical simulation of underwater explosions using an ALE method", Ocean Eng., pp.53~66 (2012)
- Cui, P., "Small-charge underwater explosion bubble experiments under various boundary conditions", Phys. Fluids, pp.117103-1-2~ (2016)
- FLACS, "User’s Manual" (2016)
- Helenbrook, B. T., "High-order adaptive arbitrary-LagrangianEulerian(ALE) simulation of solidification", Comput. Fluids, 167, pp.40~50 (2018)
- Im, K. S., "FSI detailed chemistry and their applications in LS-DYNA CESE compressible solver", 11th European LS-DYNA Conference, 2017, pp.1~5 (2017)
- Lee, S. G., "Shock response analysis of blast hardened bulkhead in partial chamber model under internal blast", Precedia Engineering 11th International Symposium on Plasticity and Impact Mechanics. Implast 2016, (173), pp.511~518 (2016)
- 이상갑, "FSI 해석기법을 이용한 에어건 수중발파 응답해석 검증", 대한조선학회 논문집, 54(6), pp.522~529 (2017), 대한조선학회[DOI]
- Lee, S. G., "Design criteria of gas diffusion and explosion in small FRP LNG fueled ship", Asia Navigation Conference, 2019, pp.1~13 (2019)
- LSTC, "LS-DYNA User’s Manual Volume III Multi-Physics Solvers. Version R9" (2016), Livermore Soft Technology Corp
- LSTC, "LS-DYNA Theory Manual" (2019), Livermore Soft Technology Corp
- Ming, F. R., "Damage characteristics of ship structures subjected to shockwaves of underwater contact explosions", Ocean Eng., 117, pp.359~382 (2016)
- Russell, David M., "Error measures for comparing transient data: Part I:development of a comprehensive error measure, Part II: error measures case study", Proceedings of the 68th Shock and Vibration Symposium (1997)
- Vannucchi de Camargo, F., "Survey on experimental and numerical approaches to model underwater explosions", J. Mar. Sci. Eng., 7(15), pp.1~13 (2019)
- Wang, G., "On the determination of the mesh size for numerical simulations of shock wave propagation in near field underwater explosion", Appl. Ocean Res., 59, pp.1~9 (2016)