Simple Adaptive Control-Based Reconfiguration Design of Cabin Pressure Control System

Zhao Zhang,Shuchang Liu,Xiaokai Zhang,Zhong Yang,Shuang Chen,Si Xiong,Danilo Comminiello

doi:10.1155/2021/6635571

Zhao Zhang, Shuchang Liu + Show 5 more

Open Access

https://doi.org/10.1155/2021/6635571

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Journal: Complexity	Publication Date: Mar 29, 2021
Citations: 8	License type: CC BY 4.0

Affiliation: Nanjing University of Aeronautics and Astronautics

Abstract

The Cabin Pressure Control System (CPCS) is an essential part of the aviation environmental control system that ensures aircraft structure and flight crew safety. However, the CPCS usually has potential faults of sensors and actuators. To this end, a Simple Adaptive Control- (SAC-) based reconfiguration method is proposed to compensate for the above adverse effects. Some good pressure control performance of CPCS can be achieved by the basic pressure controller when the system is in normal operation. A parallel feedforward compensator is designed to guarantee the closed-loop system’s stability and the almost strictly positive realness of the augmented system. Thus, the simple adaptive controller can be utilized for the CPCS. In particular, the reconfiguration system can update the control law online when the fault occurs without the system identification process. The reference model is obtained by mathematical model linearization after considering the mechanical characteristics of the CPCS. Extensive simulations under various typical fault scenarios are carried out throughout the entire flight envelope of the aircraft from take-off to landing. Simulation results validate the robustness and reconfiguration control capability of the proposed method.

Highlights

Introduction e function of the CabinPressure Control System (CPCS) is to ensure that the cabin pressure and its change rate satisfy the specification requirement throughout the entire flight envelope [1]
In terms of numerical and theoretical analysis, Liu et al provided a detailed analysis of the cabin pressure parameters in various conditions through simulating the normal and failure states of Cabin Pressure Control System (CPCS) and concluded that the pilot must descend the aircraft to a safe altitude for avoiding the fatal accidents when CPCS failed [6]
According to the previous modeling, the CPCS can be rewritten as the state-space model: x_ Ax + Bu

Summary

Introduction

Introduction e function of the CabinPressure Control System (CPCS) is to ensure that the cabin pressure and its change rate satisfy the specification requirement throughout the entire flight envelope [1]. A healthy CPCS is widely recognized to be the key to the safe completion of flight missions. To this end, some researches on the faulty CPCS have been carried out. In terms of practical engineering, Zhao et al drew attention to some typical failures of aircraft environmental control systems and found that a small black impurity stuck the pressure regulating valve, which was the cause of the continuous decrease in cabin pressure and the pain of the pilot’s eardrum [3]. In terms of numerical and theoretical analysis, Liu et al provided a detailed analysis of the cabin pressure parameters in various conditions through simulating the normal and failure states of CPCS and concluded that the pilot must descend the aircraft to a safe altitude for avoiding the fatal accidents when CPCS failed [6]. It is easy to see that the demand for reliability, safety, and fault tolerance of the Complexity

Methods

Results

Conclusion