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초록

A SRS (Soft Recovery System) recovers a projectile fired at high speed safely within certain deceleration limits and damage thresholds. Such devices are needed to verify the design and the system requirements of microelectronics and elector-optic sensors, which are frequently found in so-called smart munitions. The projectiles experience nearly 10,000g inside the cannon barrel. The sensors are needed to survive in order to function as intended. A compressible 1-dimensional Euler code with use of deforming mesh and a trajectory analysis code for the projectiles have been developed to evaluate the performance of the SRS. Roe's approximate Riemann solver for deforming mesh with MUSCL (Monotone Upwind Centered Scheme for Conservation Laws) is used to get monotone solutions. Dual time stepping with generalized Crank-Nicolson method is used in order to advance the solution accurately in time. Also, GCL (Geometry Conservation Law) is applied to preserve the physical conservation laws for solutions on deforming mesh. 4-stage Runge-Kutta time integration method is used to integrate the equation of motion for the projectile. SRS designed to stop a 20-mm bullet fired at 500m/s within 1,600g-limit has been studied, and the analysis results are discussed.