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Influence of Impact from Anti-Aircraft Bullet on Rotorcraft Fuel Tank Assembly

International Journal of Aerospace System Engineering, v.5 no.1, 2018년, pp.1 - 8  

Kim, Sung Chan (Korea Aerospace Research Institute) ,  Kim, Hyun Gi (Korea Aerospace Research Institute)

Abstract AI-Helper 아이콘AI-Helper

Military rotorcrafts are constantly exposed to risk from bullet impacts because they operate in a battle environment. Because bullet impact damage can be deadly to crews, the fuel tanks of military rotorcraft must be designed taking extreme situations into account. Fuel tank design factors to be con...

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문제 정의

  • From the analysis results, it was evaluated that diagonal impact is a relatively critical case in terms of equivalent stress. Also, it is considered that the metal fitting and the fuel tank skin have sufficient the margin of safety for the two impact conditions in this study.
  • This study presented an FSI analysis based on SPH simulating bullet impacts with the fuel tank assembly. The validity of the commercial software (LS-DYNA) for the application was demonstrated using numerical examples.
  • Therefore, to improve the crew’s survivability, various additional critical conditions need to be considered in the design of the fuel tank assembly. This study shows that there are various design parameters that could affect the bullet resistance capability of the fuel tanks. In the future, the reliability of the numerical simulations acquired in this study should be verified and, if necessary, the data correlation approach between the numerical simulation and actual test should be conducted.

가설 설정

  • In this study, we considered the real time dynamic behavior of the fuel tank assembly and the internal fluid under a bullet impact load using an explicit method. The equivalent stress was calculated for each fuel tank and the weak areas of each fuel tank assembly were investigated under bullet impact loads.
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참고문헌 (13)

  1. U.S. Army Aviation and Missile Command, "Detail Specification for the Tank, Fuel, Crash-Resistant, Ballistic-Tolerant, Aircraft", MIL-DTL-27422D, 2007. 

  2. Ugone, Mary L., Meling, John E., Snider, Jack D., Gause, Neal J., Carey, Alice F., "Acquisition: Fuel Tanks of the V-22 Osprey Joint Advanced Vertical Aircraft", D-2003-013, 2002. 

  3. Monaghan, J., Gingold, R., "Shock simulation by the particle method SPH", Journal of Computational Physics, vol. 52, no. 2, pp.374-389, 1983. 

  4. Monaghan, J., "Smoothed particle hydrodynamics", Annual Review of Astronomy and Astrophysics, vol. 30, pp.543-574, 1992. 

  5. Herreros, M.I., Mabssout, M., "A two-steps time discretization scheme using the SPH method for shock wave propagation", Computer Methods in Applied Mechanics and Engineering, vol. 200, pp. 1833-1845, 2011. 

  6. Shao, J.R., Li, H.Q, Liu, G.R., Liu, M.B., "An improved sph method for modeling liquid sloshing dynamics", Computers and Structures, vol. 100-101, pp.18-26, 2012. 

  7. Jean-Christophe Marongiu, Francis Leboeuf, JoElle Caro, Etienne Parkinson, "Free surface flows simulations in pelton turbines using a hybrid SPH- ALE method", Journal of Hydraulic Research., vol. 48, no. 1, pp. 40-49, 2010. 

  8. Liu, M., Liu, G., Zong, Z., Lam, K., "Computer simulation of high explosive explosion using smoothed particle hydrodynamics methodology", Computers and Fluids, vol. 32, no. 3, pp.305-322, 2003. 

  9. Liu, M., Feng, D.L., Guo, Z.M., "Recent developments of SPH in modeling explosion and impact problems", International Conference on Particle-based Methods-Fundamentals and Applications, Stuttgart, Germany, September, 2013. 

  10. Johnson, G., Stryk, R., Beissel, S., "SPH for high velocity impact computations", Computer Methods in Applied Mechanics and Engineering, vol. 139, pp. 347-373, 1996. 

  11. Hahn, Philipp, "On the use of meshless methods in acoustic simulations", Thesis of Master, University of Wisconsin, Madison, WI, 2009 

  12. Naval Surface Weapons Center, "Prediction of Impact Pressures, Forces, and Moments during Vertical and Oblique Water Enter", NSWC/WOL/TR77-16, 1997. 

  13. Kim, Hyun-Gi, Kim, Sung Chan, "Numerical simulation of crash impact test for fuel tank group of rotorcraft", International Journal of Crashworthiness, vol. 19, no. 6, pp. 639-652, 2014. 

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