Development and Analysis-Driven Optimization of Superelastic Slat-Cove Fillers for Airframe Noise Reduction
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Copyright 2015 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. Airframe noise constitutes a significant component of the total noise generated by transport aircraft during lowspeed maneuvers, such as approach and landing; the leading-edge slat is a major source. Previous work has shown that the noise produced by the slat can be mitigated through the use of a slat-cove filler. Results from the initial prototype testing led to slat-cove filler concepts that incorporated a segmented structure and superelastic shapememory alloy materials. A finite-element analysis model, based on the physical prototypes (with a shape profile optimized for maximumnoise reduction), was created and used to analyze the slat-cove filler response to aerodynamic and slat retraction loads with the goal of optimization. The objective was minimization of the actuation force needed to retract the slat/slat-cove filler assembly subject to constraints that involved aeroelastic deflection of the slat-cove filler when deployed, maximum stress in the shape-memory alloy flexures, and the required ability of the slat-cove filler to deploy autonomously during slat deployment. The design variables considered included shape-memory alloy flexure thicknesses and lengths of various slat-cove filler components. Design of experiment studies were conducted and used to guide the subsequent optimization. From the optimization, it was found that a monolithic shape-memory alloy slatcove filler minimized the actuation force while satisfying design constraints, which was consistent with prototype testing results.
author list (cited authors)
Scholten, W. D., Hartl, D. J., Turner, T. L., & Kidd, R. T.
complete list of authors
Scholten, William D||Hartl, Darren J||Turner, Travis L||Kidd, Reggie T