Flight Control of Hypersonic Scramjet Vehicles Using a Differential Algebraic Approach (Postprint)
Abstract
Trajectory Linearization Control is applied to the longitudinal hypersonic scramjet vehicle model under development at the Air Force Research Laboratory. The algorithm is based on Differential Algebraic Spectral Theory which features a time-varying eigenvalue concept and avoids the use of so-called frozen-time eigenvalues which can lead to unreliable results when applied to time-varying dynamics systems. A trajectory linearization control was first designed for a non-linear, affine, rigid-body model using an allocation strategy based on trim-condition look-up tables formulated by trimming the model at multiple operating points while varying velocity and altitude. This data was then fitted to a polynomial function, and the lookup tables were replaced by analytical expressions for the effector settings. The TLC design was then verified on the first-principles based, longitudinal, rigid-body hypersonic vehicle model developed at AFRL using both look-up table and curve fit strategies, and simulation testing results are presented. The current design will be further extended to allow adaptive control of time-varying flexible modes using time-varying bandwidth notch filters and a trajectory linearization observer.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 2006
- Accession Number
- ADA462412
Entities
People
- David B. Doman
- J. J. Zhu
- Michael A. Bolender
- Michael W. Oppenheimer
- Tony A. Adami
Organizations
- Ohio University