SBIR-STTR Award

During launching of regenerative liquid propellant guns, theprojectiles and their components experience potentially damaging highpressure/high frequency oscillations. The purpose of this program is todevelop the experimental and computational facilities to simulate theseeffects. The three major objectives to be accomplished in Phase I are: (1)To develop a method of inducing forced vibrations of the projectile. (2) Todevelop a computer model of the oscillation-generating medium, theprojectile and projectile components. (3) To perform limited experimentaland computational validation for projectiles/ components in the seven inchgasgun. 3C Systems, Inc. proposes to accomplish the above by producingforced vibrations with a layered medium composed of air gaps and honeycomblayers, perform finite element modeling with COSMOS/M, and support theseven inch gasgun experimentation with parallel work in 3C Systems'Electromagnetic Schock Test Facility.

During firing of regenerative liquid propellant guns (LPG), the projectiles and their components experience potentially damaging high pressure/ high frequency oscillations. The purpose of this program is to develop the experimental and computational facilities to simulate these effects. In Phase I, an experimental method of generating oscillations has been demonstrated, by analysis and experimentation, using bolt shearing in parallel with honeycomb mitigators. Structural response spectra were employed to predict how each mode of vibration of a projectile will respond to each frequency component of the input environment. In Phase II, a data base of bolt shear inputs and honeycomb mitigator inputs will be developed, in order to synthesize the input combinations that will most closely simulate the LPG pressure environment. Simulation combinations will be synthesized through use of dynamic response spectra; then evaluated by comparison of experimental measurements of structural responses with predictions of 3D models of the structures. The Army's 2" and 7" Light Gas Guns will be employed in measuring and evaluating dynamic inputs and structural responses