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Trends in Mechanical Engineering & Technology Review Article

Study on the Method of Prediction of Complete Inflation Time of Parachute

  1. Wi Song Jon Department of Dynamics, Kim Il Sung University, Taesong District, Pyongyang
  2. Sol Song Pak Department of Dynamics, Kim Il Sung University, Taesong District, Pyongyang
  3. Won Hak Kim Department of Dynamics, Kim Il Sung University, Taesong District, Pyongyang
  4. Jong Dok Ri1 Department of Dynamics, Kim Il Sung University, Taesong District, Pyongyang
  5. Jong Hwang Department of Dynamics, Kim Il Sung University, Taesong District, Pyongyang

Abstract

In general, the parachute test is a long test period, expensive, and difficult to measure with accuracy, which makes it a very laborious and laborious task due to the strong nonlinearity of the fabric of the parachute. Therefore, attempts have been made to overcome this by using a parachute testbed or by simulation, but in our country, there is no numerical simulation of the parachute, and no research has been done on it. According to the development of military techniques, it is very important to determine the complete inflation time of the parachute. So far, there is no method to predict the total expansion time of a parachute, which depends on empirical formulas and various data. In this paper, we discussed how to determine this. Finally, a model of the parachute was developed using the fluid-structure interaction technique (FSI) in the LS-DYNA program, which is a transient dynamic finite element code. In general, it has been considered difficult to predict the total inflation time of a parachute, and measurements have been made by approximate calculations and experimental methods. Predicting the correct divergence time is of great importance in determining the standard drop height and the rate of the drop. To this end, we have investigated how to calculate the air-filling time of a parachute. A mathematical model for calculating air-filling time is developed and verified by a numerical example, combining the mass conservation equation and the equations of motion of the parachute system for a circular parachute.

Keywords

References (16)

  1. Tezduyar T, Aliabadi S, Behr M, Johnson A, Mittal S. Parallel finite-element computation of 3D flows. Computer. 1993;26(10):27-36. doi:10.1109/2.237441
  2. Tezduyar TE, Aliabadi SK, Behr M, Mittal S. Massively parallel finite element simulation of compressible and incompressible flows. Computer Methods in Applied Mechanics and Engineering. 1994;119(1-2):157-177. doi:10.1016/0045-7825(94)00082-4
  3. Mittal S, Tezduyar TE. Massively parallel finite element computation of incompressible flows involving fluid-body interactions. Computer Methods in Applied Mechanics and Engineering. 1994;112(1-4):253-282. doi:10.1016/0045-7825(94)90029-9
  4. Mittal S, Tezduyar TE. Parallel finite element simulation of 3D incompressible flows: Fluid‐structure interactions. International Journal for Numerical Methods in Fluids. 1995;21(10):933-953. doi:10.1002/fld.1650211011
  5. Johnson AA, Tezduyar TE. Advanced mesh generation and update methods for 3D flow simulations. Computational Mechanics. 1999;23(2):130-143. doi:10.1007/s004660050393
  6. Kalro V, Tezduyar TE. A parallel 3D computational method for fluid–structure interactions in parachute systems. Computer Methods in Applied Mechanics and Engineering. 2000;190(3-4):321-332. doi:10.1016/s0045-7825(00)00204-8
  7. Stein K, Benney R, Kalro V, Tezduyar TE, Leonard J, Accorsi M. Parachute fluid–structure interactions: 3-D computation. Computer Methods in Applied Mechanics and Engineering. 2000;190(3-4):373-386. doi:10.1016/s0045-7825(00)00208-5
  8. Tezduyar T, Osawa Y. Fluid–structure interactions of a parachute crossing the far wake of an aircraft. Computer Methods in Applied Mechanics and Engineering. 2001;191(6-7):717-726. doi:10.1016/s0045-7825(01)00311-5
  9. Ohayon R. Reduced symmetric models for modal analysis of internal structural-acoustic and hydroelastic-sloshing systems. Computer Methods in Applied Mechanics and Engineering. 2001;190(24-25):3009-3019. doi:10.1016/s0045-7825(00)00379-0
  10. Tezduyar TE, Sathe S, Keedy R, Stein K. Space–time techniques for finite element computation of flows with moving boundaries and interfaces. In: Gallegos S, Herrera I, Botello S, Zarate F, Ayala G, editors. Proceedings of the III International Congress on Numerical Methods in Engineering and Applied Science [CD-ROM]. Monterrey, Mexico; 2004.
  11. TORII R, OSHIMA M, KOBAYASHI T, TAKAGI K, TEZDUYAR TE. Influence of Wall Elasticity on Image-Based Blood Flow Simulations. TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A. 2004;70(697):1224-1231. doi:10.1299/kikaia.70.1224
  12. van Brummelen EH, de Borst R. On the Nonnormality of Subiteration for a Fluid-Structure-Interaction Problem. SIAM Journal on Scientific Computing. 2005;27(2):599-621. doi:10.1137/s1064827503431430
  13. Michler C, van Brummelen EH, de Borst R. An interface Newton–Krylov solver for fluid–structure interaction. International Journal for Numerical Methods in Fluids. 2004;47(10-11):1189-1195. doi:10.1002/fld.850
  14. Gerbeau JF, Vidrascu M, Frey P. Fluid–structure interaction in blood flows on geometries based on medical imaging. Computers & Structures. 2005;83(2-3):155-165. doi:10.1016/j.compstruc.2004.03.083
  15. Tezduyar TE, Sathe S, Keedy R, Stein K. Space–time finite element techniques for computation of fluid–structure interactions. Computer Methods in Applied Mechanics and Engineering. 2006;195(17-18):2002-2027. doi:10.1016/j.cma.2004.09.014
  16. Tezduyar TE, Sathe S, Stein K. Solution techniques for the fully discretized equations in computation of fluid–structure interactions with the space–time formulations. Computer Methods in Applied Mechanics and Engineering. 2006;195(41-43):5743-5753. doi:10.1016/j.cma.2005.08.023
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