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Trends in Mechanical Engineering & Technology Original Research

Study on the Rocking Phenomenon of Parachute Rope

  1. Tae Jin Pak 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. Kwang Ho Kim Department of Dynamics, Kim Il Sung University, Taesong District, Pyongyang,
  4. Kyong Jun Kim Department of Dynamics, Kim Il Sung University, Taesong District, Pyongyang,
  5. Won Hak Kim Department of Dynamics, Kim Il Sung University, Taesong District, Pyongyang,

Abstract

With the constant development of computer technology and the development of numerical simulation techniques, the simulation of the dynamics of the parachute is becoming increasingly accurate. To eliminate the effects of large deformation of the grid in the conventional parachute simulation, we chose the parachute model using the smooth particle hydrodynamics method and performed a steady-state fluid-solid coupling numerical simulation, which is in good agreement with the calculated gas power coefficient and wind tunnel test results. The effect of air particle density on the numerical results was investigated, and the results showed that if the particle density is too low, the parachute structure unit is difficult to effectively combine with the flow field and the calculation accuracy is low, but if the particle density exceeds a certain value, not only can the computational cost increase but also the calculation accuracy is increased, thus affecting the calculation accuracy. Based on this, the parachute descent process under different initial velocities was simulated to obtain the dynamic dynamics of the parachute profile, projection diameter, descent velocity, parachute power and the fluctuating angle of the parachute. The numerical results show that the respiratory frequency of Raha Mountain, the equilibrium velocity after rest and the gas power are relatively less affected by the velocity, but with increasing speed the respiratory strength and the swing angle of the parachute increase, and the damping of the swing angle should be lower than the damping capacity of the projection diameter. The SPH simulation method can effectively avoid the problem of mesh deformation of parachute fluid solid coupling and has wide application prospects in flexible large deformation fluid solid coupling problem.

Keywords

References (14)

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