Effects of displacement and rate saturation on the control of statically unstable aircraft

Gregory D. Hanson, Robert F. Stengel

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Methodologies are presented for the analysis and design of stability augmentation control laws for aircraft in which "hard" displacement and rate limiting are significant. Candidate control laws are derived using the linearquadratic (LQ) regulator. Analytical and computational estimates of the stability limits imposed by control saturation are presented using state trajectories, as well as describing functions and eigenvalue computation. Analysis also includes an investigation of the interaction of the state-space saturation and stability boundaries for various choices of LQ weighting matrices. For minimum energy control, the saturation and stability boundaries are shown to be parallel. In this case, there is a direct relation between the solution to the matrix Riccati equation and the aircraft's open-loop dynamics.

Original languageEnglish (US)
Pages (from-to)197-205
Number of pages9
JournalJournal of Guidance, Control, and Dynamics
Issue number2
StatePublished - 1984

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Applied Mathematics
  • Electrical and Electronic Engineering
  • Control and Systems Engineering
  • Space and Planetary Science


Dive into the research topics of 'Effects of displacement and rate saturation on the control of statically unstable aircraft'. Together they form a unique fingerprint.

Cite this