A nonlinear digital controller for an aeronautical pneumatic system. (October 2020)

• Record Type: Journal Article
• Authors: Silva, Dayvis Dias da; Turcio, Wallace; Yoneyama, Takashi
• Is Part Of: Control engineering practice. Volume 103(2020)
• Publication Date: 2020-10
• Subjects: Engine bleed air system -- Nonlinear control -- Noise -- Filtering -- Sample rate; Automatic control -- Periodicals; 629.89
• DOI: 10.1016/j.conengprac.2020.104582
• Languages: English
• ISSNs: 0967-0661

Abstract

Abstract: This work analyzes the use of digital controllers for the temperature regulation of an aeronautical pneumatic system based on discretized nonlinear control laws. The assessed nonlinear control laws are based on feedback linearization, sliding mode and flatness-based control, with a particular emphasis on the noise. Some filtering strategies are proposed, with special attention on the high-order derivative signals. The issue of choosing the sample rate is addressed for each of the control laws. Tests were carried out using a realistic model with the structure validated with the actual experimental data. Nevertheless, some system parameters have been intentionally modified due to industrial confidentiality. Highlights: Nonlinear control techniques are applicable for engine bleed temperature control. System performance is improved, compared to a traditional PID. Digital implementation requires sampling not higher than 256 Hz. Complexity is increased and requires the use of high-order derivatives signals. Smooth high-order derivatives signals can be obtained from noisy inputs.