Flight Control Law Design with Hierarchy-Structured Dynamic Inversion Approach

Design of Flight Control System Based on Adaptive Backstepping Method for a Space Transportation System

“…According to Kawaguchi et al 7) and Ninomiya et al, 12) the control gains common to both methods were set to k 1 ¼ 0:2 and k iþ1 ¼ k i =0:4 ði ¼ 1; 2; 3Þ, and the observer gains were set to k 1;2 ¼ 2 and k 3;4 ¼ 4. The differences between the proposed method and the conventional method were that interference between subsystems and the effects of estimation errors were both compensated for by the improved disturbance observer.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13] Here, time-scale separation refers to a method of separating the dynamic characteristics of a vehicle into multiple subsystems based on response speeds and designing control laws for each subsystem. Now, considering the flight control problem from the viewpoint of the relative degree (for a nonlinear system, the relative degree is defined as the number of times an output has to be differentiated before an input appears explicitly), the problem can be viewed as a nonlinear control problem that deals with 12 states (three-dimensional position, velocity, angle, and angular velocity) based on four inputs, namely, thrust (or speed-brake deflection), aileron deflection, elevator deflection, and rudder deflection.…”

“…For this problem, in feedback linearization methods combined with time-scale separation, a procedure including the following steps has been executed [1][2][3][4][5][6][7][8][9][10][11][12][13] : separating the dynamic characteristics of a vehicle into multiple subsystems having lower relative degrees and linearizing the nonlinear dynamic characteristics included in the individual subsystems by canceling the characteristics with corresponding nonlinear feedbacks.…”

Stochastic Approach to Robust Flight Control Design Using Hierarchy-Structured Dynamic Inversion

“…The objective of this paper is to assess the applicability of a flight control design methodology based on hierarchy-structured dynamic inversion (HSDI) [1,2], which enables simple and systematic flight control design and facilitates the automatic tuning of design parameters. HSDI is formulated as a nested structure of four nonlinear dynamic inversion (NDI) [3][4][5] controllers based on the timescale separation technique [6][7][8][9][10] and includes only proportional feedback gains as design parameters.…”

Flight Control System Using Backstepping Method for Space Transportation System

“…A backstepping controller [1][2][3] can be constructed as an expansion of a control system using feedback linearization combined with time-scale separation. Controllers using feedback linearization combined with time-scale separation have been widely studied [4][5][6][7][8][9][10] . The merits of such control systems compared to systems using conventional gain scheduling control are the following two points.…”