38 articles
State observers for nonlinear systems
State observers for nonlinear systems are algorithms that estimate a system's unmeasured internal variables in real time from measured inputs, outputs, and a model of the dynamics.
Steady-state error
Steady-state error is the difference between a control system's reference input and its output after transients die away, governed by input shape and system type.
Stochastic subspace identification
Stochastic subspace identification (SSI) is a family of time-domain system identification algorithms that estimate a state-space model from output-only vibration data, without measuring excitation, and is widely used for operational modal analysis.
Supervisory control theory
Supervisory control theory is a framework for automatically synthesizing a supervisor that disables controllable events so a discrete-event system meets its specification, founded by Ramadge and Wonham in 1987.
Time domain analysis
Time domain analysis examines a system's signals as explicit functions of time, producing response waveforms and performance measures like overshoot, rise time, and settling time.
Trajectory linearization control
Trajectory linearization control is a nonlinear control method that stabilizes a system along a commanded trajectory, developed by J. Jim Zhu and applied to NASA's X-33.
Trajectory tracking via transverse feedback linearization
Transverse feedback linearization is a nonlinear control method that turns the dynamics moving away from a chosen set, such as a path, into a linear system.
Unknown input observer
An unknown input observer (UIO) is an estimator that reconstructs a system's state without knowledge of some inputs, mainly used to generate robust residuals for fault detection and isolation.