Guide the process of deceleration spin dynamics analysis sensitivity Projectile
|School||Nanjing University of Technology and Engineering|
|Course||Artillery , automatic weapons and ammunition Engineering|
|Keywords||Terminal Sensitive Projectile Vortex ring parachute Steady-state scanning Fluid-Structure interaction (FSI) Lagrange mechanics orthogonal experiment approach grey theory|
The principle of the Terminal Sensitive Projectile (TSP) was discussed first in this thesis, and the scanning process of a vortex ring parachute TSP system was analyzed accordingly.Theoretical analysis, numerical and experimental verification were combined to establish a dynamic model for the vertex ring parachute TSP system. Respectively, dynamic characteristics of different stages were analyzed in this thesis. On all these premises, the major factors which affected the TSP system’s final damage probability were summarized. The main contents of this thesis include:Firstly, structure of the vortex ring parachute TSP system was designed and analyzed. Respectively, the decelerating and rotating mechanism were studied. Thereby, optimized structure model was proposed with improved rotation torque and rotation-velocity ratio.Secondly, inflation process of the vortex ring parachute was detailed analyzed. The permeability parameters of the parachute and the inflation model of the parachute system were studied separately. Based on LS-DYNA software, a new method to analyze and simulate the parachute inflation process was proposed. With the obtained permeability parameters, the aerodynamic parameters of the parachute during the inflation process were deduced through the simulation, and dynamic change rules of the parachute were further analyzed.Thirdly, based on Lagrange mechanics, a ten-degree-of-freedom dynamic model of the TSP system was developed. With MATLAB coding, the descent velocity, rotating speed, scanning angle and scanning trajectory were obtained.Fourthly, the impact factors which affected the damage probability were analyzed respectively. On the basis, sensitivity analysis on these factors was conducted by adopting orthogonal experiment approach. Furthermore, the optimized scan parameters were deduced through grey neural network and genetic algorithm.Finally, the further research direction of this vortex ring parachute system was pointed out.