Investigation of Factors Which Contribute to the Mallaunch of Free Rockets.
Final rept. 1 Oct 74-31 Dec 75,
AUBURN UNIV ALA ENGINEERING EXPERIMENT STATION
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Results of an investigation concerned with evaluating factors which contribute to the mallaunch of free rockets are reported. Modifications to a previously developed digital computer code which simulates the dynamics of a single-round rocketlauncher, from the time the rocket is at rest on the launcher until it impacts, are described. These modifications make the simulation much more realistic. A new rigid-constraints model for a single-round rocketlauncher system is described and vectormatrix methods are used to obtain matrix ordinary differential equations which govern the systems motion. A digital computer code which implements the numerical solution of these equations is included. Both codes modified and new are very general and provide for modeling the effects of launcher motions, rocket dynamic unbalance, thrust malalignment, winds, rocket aerodynamics and variable rocket inertia characteristics. The new code also provides the capability for modeling jet damping and requires less computer time than the modified code. Typical simulation results are presented. Pitch data from two free rocket test flights are compared with simulation results. It is concluded that dynamic unbalance andor thrust malalignment affected the motions of the two rockets considered, but that other factors of uncertain origin were also presented. Recommendations for further study are made. Author
- Numerical Mathematics
- Computer Programming and Software