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Research Papers

# $L1$ Adaptive Control for Aircraft Air Management System Pressure-Regulating Bleed Valve

[+] Author and Article Information
John Cooper

Department of Mechanical Engineering,
University of Connecticut,
Storrs, CT 06269
e-mail: john.cooper@uconn.edu

Chengyu Cao

Department of Mechanical Engineering,
University of Connecticut,
Storrs, CT 06269
e-mail: ccao@engr.uconn.edu

Jiong Tang

Professor
Department of Mechanical Engineering,
University of Connecticut,
Storrs, CT 06269
e-mail: jtang@engr.uconn.edu

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received September 18, 2016; final manuscript received May 10, 2017; published online August 10, 2017. Assoc. Editor: Yang Shi.

J. Dyn. Sys., Meas., Control 139(12), 121005 (Aug 10, 2017) (7 pages) Paper No: DS-16-1448; doi: 10.1115/1.4036949 History: Received September 18, 2016; Revised May 10, 2017

## Abstract

This paper presents an $L1$ adaptive controller for pressure control using an engine bleed valve in an aircraft air management system (AMS). The air management system is composed of two pressure-regulating bleed valves, a temperature control valve, a flow control valve, and a heat exchanger/precooler. Valve hysteresis due to backlash and dry friction is included in the system model. The nonlinearities involved in the system cause oscillations under linear controllers, which decrease component life. This paper is the unique in the consideration of these uncertainties for control design. This paper presents simulation results using the adaptive controller and compares them to those using a proportional–integral (PI) controller.

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## References

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## Figures

Fig. 3

L1 block-diagram

Fig. 2

Pressure-regulating engine bleed valve

Fig. 1

Schematic of a typical air management system

Fig. 7

Simulation results using PI controller: (a) tracking performance, (b) control input with hysteresis, and (c) valve angle

Fig. 6

Simulation results using L1 adaptive controller: (a) tracking performance, (b) control input with hysteresis, and (c) valve angle

Fig. 4

Mapping from β to Pd for W = 0.8314 kg/s, Tu = 297.22 K

Fig. 5

Hysteresis loop

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