Title: Modeling and Simulation in the Adaptive VOrticity Control Enabled flight (AVOCET) Program
Speaker: Ari Glezer (Georgia Institute of Technology), Arne Pearlstein (University of Illinois), Anthony Leonard (California Institute of Technology), Robert Moser (University of Texas)
Date/Time: Thursday, May 11, 2006, 9:00 -10:00 am (MT)
Location: Building 980, Room 95 – NM, Building 915, Room S101 – (video link to CA)
Brief Abstract: AVOCET is a five-year AFOSR MURI (Multidisciplinary University Research Initiative) Program focusing on closed-loop flow control to achieve rapid, dynamic maneuvering and attitude control for small scale UAVs (e.g., urban environments, gust rejection, etc.). The required net forces and moments will be varied independently by dynamically tailoring the surface pressure distribution on lifting surfaces using a sparse array of hybrid fluidic actuators to manage the generation, accumulation (trapping), and regulation of spanwise vorticity near the lifting surface and of streamwise vorticity near the wing tips (especially on low aspect ratio planforms).
This tailoring will be accomplished with adaptive control architectures using closed-loop feedback from surface-mounted pressure and flow direction (micro-tuft) sensors that will enable rapid, distributed sensing of flow conditions near the lifting surface. The adaptive controller design will be based on a low-order model of the vorticity dynamics, and will compensate for unmodelled dynamics. High fidelity numerical simulations and an integrated wind tunnel test program will be used to provide data for the development of low-order models, placement of sensors and actuators and analysis of controller effectiveness.
In this talk, a brief overview of the AVOCET program will be given, followed by more detailed discussion of the development of computational fluids models and low-order models to be used in the adaptive controller. In the simulations, a detached eddy simulation of the turbulence and very large large-scale vortices is being used, along with an efficient representation of the synthetic jet actuators. Two approaches to the low-order modeling are being pursued, one based on POD representations, the other founded on a vortex dynamics model.
CSRI POC: S. Scott Collis, (505) 284-1123 |