Abstract

Joint research between the U.S. Army Soldier and Biological Chemical Command (SBCCOM), Soldier Systems Center (Natick), and the University of Connecticut focuses on the use of a 3-D Structural Dynamic (SD) finite element code to predict the behavior of contr+lable airdrop systems. The code has been paralklized and coupled to Computational Fluid Dynamics (CFD) codes by SBCCOM and Army High Performance Computing Research Center (AHPCRC) researchers at Rice University (Members of the Team for Advanced Flow Simulation and Modeling (T*AFSM)). This paper discusses the current state of the code and presents examples of its usage in predicting the behavior of existing and new concepts for controllable airdrop systems. The paper presents results from four 3-D dynamic simulations: Case 1) a ribbon canopy during a two stage disreefing process; Cases 2 & 3) two methods of controlling a high-speed container delivery system (HCDS) utilizing a cross canopy with an A-22 container; and Case 4) control of a round C-9 canopy/payload system via four control actuators. (The latter system is currently being tested by a Boeing/Vertigo/SBCCOM team under the New World Vistas Precision Aerial Delivery (NWVPAD) program: Progress related to that system is reported separately.’ This paper presents an overview of the software (TENSIONS) and its capabiities, approximations and assumptions used in the sample case models and detailed results of the predicted timdependent motions, orientations and control line force histories. * This paper is declared a work of the U.S. Government and is not subject to copyright protection in the United States. tAerospace Engineer, Senior Member

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