Separation Dynamics of Strap-On Boosters

The dynamics associated with the jettisoning of a number of strap-ons from the parent launch vehicle is investigated. Three different models for the separation mechanisms are considered. Included in the analysis are forces due to the jettisoning mechanism along with the thrust on the core and the residual thrust on the strap-ons. Aerodynamic forces are, however, not considered. Geometry of collision in the multibody system is analyzed and three different criteria for detection of collisions are developed. The methodology is illustrated using two typical examples. The attitude motion of the controlled ongoing stage has been indirectly accounted for. Finally, a simple representation of the separation system is employed to construct a no-collision domain in the design parameter space.