THE MACH 5 TO 3.5 MORPHING WAVERIDER OPTIMAL ACTUATION LOCATION SELECTION

摘要

This paper investigates a morphing hypersonic waverider concept and determines the morphing surface control system requirements needed to morph the waverider to achieve Mach 5 to Mach 3.5 operation. Hypersonic waveriders have long been of interest in the aerospace community due to their significant aerodynamic performance improvements over conventional hypersonic vehicles. The key technical limitation of conventional waveriders is that their on-design performance is only achieved at a single Mach number and deviations in geometry or speed degrade aerodynamic performance. The NRL Family of waveriders attempts to achieve on-design waverider performance across a range of speeds by maintaining shock attachment through morphing the averider"s lower stream surface and maintaining a rigid leading edge and top surface. This paper evaluates the complexity and accuracy of the morphing system required to enable a high-performance morphing waverider. A Q-DEIM sensitivity analysis is performed to provide a control point parameter ranking to help identify a high-performance control point set. A parameterized FEM is developed to evaluate the locations and number of actuators required to deliver the needed morphing accuracy. The resulting parameter ranking's performance is quantified relative to 1000 randomly generated parameter rankings to validate the proposed methodology. This paper demonstrates a 5 point and a 14 point control cases that can reduce 87% and 95% of the surface error mitigation respectively for a six inch wide morphing hypersonic waverider operating from Mach 5 down to Mach 3.5.