Volume 32 Issue 11
Nov.  2017
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Friction analyses of the rocket sled system[J]. Journal of Aerospace Power, 2017, 32(11): 2769-2776. doi: 10.13224/j.cnki.jasp.2017.11.026
Citation: Friction analyses of the rocket sled system[J]. Journal of Aerospace Power, 2017, 32(11): 2769-2776. doi: 10.13224/j.cnki.jasp.2017.11.026

Friction analyses of the rocket sled system

doi: 10.13224/j.cnki.jasp.2017.11.026
  • Received Date: 2017-02-14
  • Publish Date: 2017-11-28
  • Based on the nonlinear and unsteady motion and friction characteristics analyses of the rocket sled in dynamic testing, the dynamic modeling and numerical simulation of the rocket sled were carried out. Meanwhile, the dynamic and aerodynamic characteristics of the rocket sled in different motion states were analyzed. The results showed that the drag coefficient was about 0.58, and the lift coefficient was about 0.003 during the velocity range from 60m/s to 90m/s. The aerodynamic force of the rocket sled mainly manifested as drag force, and the lift was less than the rocket sled weight, about 0.5%-1.2% of the weight. On the other hand, sliding velocity was the main affecting factor of the friction coefficient. With the increase of the sliding velocity, the friction coefficient decreased. Considering the results from both simulation and tests, the function of friction coefficient in terms of velocity was established in the power form with a coefficient of 2.554, and an exponent of -0.756. The predictive values of the rocket sled calculated by the friction coefficient formula under different conditions agreed well with the experimental data.

     

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