Application of System Identification to Parachute Modeling

Murri, Daniel G ; Morelli, Eugene A ; Pei, Jing ; Roithmayr, Carlos M ; Matz, Daniel A ; Barton, Richard L

关键词: AERODYNAMIC CHARACTERISTICS;    AERODYNAMIC COEFFICIENTS;    AERODYNAMIC FORCES;    AIR MASSES;    DYNAMIC PRESSURE;    PARACHUTE DESCENT;    SYSTEM IDENTIFICATION;    TERMINAL VELOCITY;    TIME DEPENDENCE;    VERTICAL MOTION;   

RP-ID  :  NASA/TM-2019-220410/Volume II,NESC-RP-15-01037,L-21062,NF1676L-34601

学科分类：工程和技术（综合）

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

A series of exact analytical solutions is developed for a capsule with two parachutes to verify CAPDYN and FAST results for terminal conditions. The case described herein is for the capsule and two parachutes acting as a fixed system in terminal descent. In this simplest case, the density is modeled as a constant defined by the initial release altitude. The analytical solution predicts the system terminal dynamic pressure, velocity, and altitude for comparison with CAPDYN and FAST simulation results.