Development and Evaluation of a Dynamic, 3-Degree-of-Freedom (DOF) Wind Tunnel Model

Report No. ARL-CR-0807
Authors: Bryant P Nelson
Date/Pages: November 2016; 36 pages
Abstract: Wind tunnel experiments have been used for decades to collect data and build representative aerodynamic models; however, the model itself is usually static. This report focuses on the unique design of a dynamic, 3-degree-of-freedom (DOF) wind tunnel model, release mechanism, and sting that is capable of simulating "free-flight" of an 83-mm projectile using its own, self-contained electronics and maneuver mechanisms. The objective is to validate state estimation and control algorithms, parameterize and quantify flight behavior, and assess the performance of the Control Actuation System (CAS). One of the unique aspects is the internal gimbal mechanism, which eliminates any gimbal-induced flow disturbances. All 3 axes can be locked independently and are instrumented with high-resolution feedback. Experiments were conducted at Mach 0.2 and 0.6 in a subsonic and transonic wind tunnel, respectively. Tunnel-specific differences in the sting and release mechanism are highlighted as well as a few representative data sets.
Distribution: Approved for public release
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Last Update / Reviewed: November 1, 2016