This paper proposes a robust design optimization methodology under design uncertainties of an aerospace vehicle propulsion system. The approach consists of 3D geometric design coupled with complex internal ballistics, hybrid optimization, worst-case deviation, and efficient statistical approach. The uncertainties are propagated through worst-case deviation using first-order orthogonal designmat...

The Naval Surface Warfare Center, Dahlgren Division (NSWCDD), is the lead technical activity in an effort to develop electric primers which are insensitive to radio frequency (RF) energy. The program is specifically directed at solving the Navy's worst Hazards of Electromagnetic Radiation to Ordnance (HERO) problem, 20 mm ammunition used with the PHALANX Close-In Weapon System (CIWS). The techn...

Tumor areas can now be very precisely delimited thanks to technical progress in imaging and ballistics. This has also led to the development of novel radiotherapy protocols, delivering higher doses of ionizing radiation directly to cancer cells. Despite this, radiation toxicity in healthy tissue remains a major issue, particularly with dose-escalation in these new protocols. Acute and late tiss...

An internal ballistics model has been developed for performance prediction of a solid propellant rocket motor. In this model a 1-D unsteady Euler equation with source terms is considered. The flow is assumed as a non-reacting mixture of perfect gases with space and time varying thermo physical properties. The governing equations in the combustion chamber are solved numerically by using the Steg...

Abstract A crime scene can provide valuable evidence critical to explain reason and modality of the occurred crime, it also lead arrest criminals. The type collected by investigators or law enforcement may accordingly effective involved cases. Bullets cartridge cases examination is paramount importance in forensic science because they contain traces microscopic striations, impressions markings,...