airplane in presence of asymmetric left-wing damaged. ‎Variations of the aerodynamic parameters, mass and ‎moments of inertia, and the center of gravity due to ‎damage are all considered in the nonlinear ‎mathematical modeling. The proposed discrete-time ‎nonlinear MRAC algorithm applies the recursive least ‎square (RLS) algorithm as a parameter estimator as ‎well as the error between the real ...

In this paper, we derive a sensor-based nonlinear dynamic inversion (NDI) control law for system with first-order linear actuators, and compare it to incremental (INDI), which has gained popularity in recent years. It is shown that, actuator dynamics, INDI approximates the corresponding NDI arbitrarily well under condition of sufficiently fast actuators. If bandwidth low compared changes states...

This paper presents adaptive robust controllers for force tracking application in a quarter-car active suspension system. In previous publications (Chantranuwathana and Peng 1999a, 1999b), an active suspension architecture was presented. The overall active suspension system was decomposed into two loops. At the main-loop, the desired force signal is calculated while the sub-loop force tracking ...

We consider the stabilization of nonlinear ODE systems with actuator dynamics modeled by a wave PDE whose boundary is moving and is a function of time and of the ODE’s state. Such a problem is inspired by applications in oil drilling where the position of the drill bit is a state variable in the ODE modeling the friction-dominated drill bit dynamics while at the same time being the position of ...

Abstract In this paper, the effect of nonlinear actuator dynamics on performance an active load alleviation system for experimental flexible wing is studied. Common nonlinearities such as backlash or rate limits are considered control surface actuator. An aeroelastic simulation model a with being used. With this, parameter study carried out to quantify impact individual overall closed-loop by m...

This article describes a simulator of small satellite attitude environment and dynamics, complete with a set of realistic sensors and the most commonly used actuator in this class of satellites. The simulator described is useful in attitude estimation and control algorithm development. Some results of the simulation of the PoSAT-1 satellite are presented.