An Output-Based Limit Protection Strategy for Turbofan Engine Propulsion Control with Output Constraints

Abstract

To accomplish the limit protection task, the Min-Max selection structure is generally adopted in current aircraft engine control strategies. However, since no relationship between controller switching and limit violation is established, this structure is inherently conservative and may produce slower transient responses than the behavior by engine nature. This paper proposes an output-based limit management strategy, which consists of the safety margin module and the parameter prediction module to monitor system responses, plus the switching logic to govern switches between the main controller and limiters, and, in this way, a faster transient performance is achieved, and the limit protections in transient states become more effective. To realize smooth switching control, the linear-quadratic bumpless transfer method is developed. The design principle of the multi-loop switching control and bumpless compensator is detailed, and the effect-on limit protection control performance-of the design parameters in the safety margin and parameter prediction modules are also analyzed. The proposed approach is tested using simulations covering the whole flight envelope on the nonlinear component-level model of a turbofan engine, and the superiority over the Min-Max architecture is also validated.

Study of the Radar Cross-Section of Turbofan Engine with Biaxial Multirotor Based on Dynamic Scattering Method

“…The finite difference method based on the concept of generalized scattering amplitude is applied to the scattering of electromagnetic waves by a two-dimensional airfoil where the wing here uses an improved NACA 4418 airfoil [15]. These studies are based on the electromagnetic scattering calculations when the target is static [16,17], while the engine has many high-speed rotating rotor parts [18,19], which obviously has a dynamic effect [20,21] on the electromagnetic scattering characteristics of the aircraft.…”