BS in Aerospace Engineering
Aerospace Engineering Department
Mark D. Buchholz, Aerodynamics Engineer, Lockheed Martin Aeronautics
The Conceptual Aircraft Hinge Moment Measurement System (CAHMMS) was designed, prototyped, and validated to improve hinge moment estimates early in the design process. Validation was performed by integrating CAHMMS with a test wing and conducting wind tunnel tests to compare the expected theoretical, historical, and Computational Fluid Dynamics (CFD) predictions to the experimental results. As CAHMMS is an external measurement system, interference effects at the connection points were investigated. Further studies were undertaken to verify the CFD predictions with the experimental hinge moment measurements. Hinge moment results from the experimental data and the theoretical data closely correlated with less than 5% difference, validating the CAHMMS design. Over simplification of boundary layer modeling and mesh generating techniques are attributed to the poor correlation of the analytical data. Understanding of the CAHMMS system and its interactions with the test surface can be further determined through finer mesh generation and more precise boundary layer modeling using the CFD analytical technique.