Hybrid Control System for a Future Small Aircraft

Heller, Matthias; Schuck, Falko; Peter, Lars; Holzapfel, Florian

doi:10.2514/6.2011-6635

Cited by 9 publications

(3 citation statements)

References 3 publications

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“…But by assessing valid closed loop response parameters a delay must be inserted which represents the delay by the resulting closed loop system. In the presented case the equivalent time delay induced by the actuator model is represented by equation (1). Moreover the known and supposed final delays in the closed loop system (to and from FCC) must also be represented during the analysis.…”

Section: Consistent Criteria Synthesismentioning

confidence: 99%

Longitudinal Robust Controller for Excellent Handling Qualities Design of a General Aviation Aircraft using QFT

Schuck

Heller

Baier

et al. 2013

AIAA Guidance, Navigation, and Control (GNC) Conference

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Handling Qualities improvement by means of active Fly-by-Wire Flight Control Systems has been applied successfully since decades. In contrast small general aviation aircraft are still missing such valuable pilot assistance in terms of the manifold benefits offered by advanced Active Fly-by-Wire Flight Control Systems featuring a wide range of functionalities and applications. In order to bring such a system to a real aircraft as well as allowing the system to be certified in future, controller design layout must be tailored to the general aviation aircraft constraints, e.g. available actuators, sensors and sensor signals, mechanical linkage design, control surface deflection limitations and aircraft dynamics. E.g. in order to minimize the number of sensor signals, the controller should be designed featuring maximum robustness and hence, to yield the capability to operate with fixed gains (not requiring any velocity/dynamic pressure based gain scheduling) both for the whole flight envelope as well as any configuration changes with respect to flaps or landing gear. For that purpose the Quantitative Feedback Theory (QFT) has been applied to the controller design in order to meet the desired handling qualities criteria, including the Control Anticipation Parameter (CAP), Neal Smith, C-Star (C*), Drop Back and others.Consequently, an integrated approach is presented which incorporates and combines all these criteria. Moreover the often neglected part of the inceptor and feel system design, respectively, is addressed in order to provide excellent handling for the pilot. The presented technology work is applied in a joint Research project of an Austrian aircraft manufacturer and the Technische Universität München.

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Section: Consistent Criteria Synthesismentioning

confidence: 99%

Longitudinal Robust Controller for Excellent Handling Qualities Design of a General Aviation Aircraft using QFT

Schuck

Heller

Baier

et al. 2013

AIAA Guidance, Navigation, and Control (GNC) Conference

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“…Light aircraft, generally, are designed with conventional mechanical linkages, rods, and cables instead of fly-by-wire or fully hydraulic control systems concerning requirements and cost, even if there is an academic study to enhance the flying quality [30]. The reversible control system, which is of concern in this study, is directly affected by aerodynamic loads and motion-induced structural friction.…”

Section: Stick-free Control Surface Dynamicsmentioning

confidence: 99%

Stick-free Flight Stability Problem Revisited: A Modeling and Simulation Approach

Altunkaya¹,

OZKOL²

2022

Preprint

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The stick-free flight stability is an old-fashioned and non-progressive issue; nevertheless, it is still existent, and of significant importance to the design of aircraft whose control system is reversible. The problem’s existence necessitates a deep assessment of stick-free flight stability throughout the aircraft design. Up to now, this problem has been addressed using either analytical approaches, which are only related to the static stability evaluation, or performing flight tests. In this study, the problem is handled in its entirety, from static and dynamic flight stability assessment to design criteria with a comprehensive perspective. Moreover, it is also exhibited that contrary to what has been generally proposed in the literature, limiting the problem of stick-free flight stability through static stability assessment is far from the main challenge. As a brief scope, the derivation of the control surface dynamics, a stick-free trim algorithm, and assessment rationale of the stick-free static and dynamic flight stability using a simulation approach are proposed. As a consequence, the aim is to set a broad understanding for designers related to this phenomenon and add adjunct design criteria in the design optimization process by approaching it in terms of modeling, simulation, and flight test perspective.

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“…In recent years, hybrid systems have attracted many researchers from various fields, and more and more investigations focused on the theoretical exploration and engineering applications of hybrid systems in a variety of industries and fields, such as electric systems [1,2], vehicle dynamic control [3,4], aircraft design and control [5][6][7], traffic control [8,9], robot systems [10,11], chemical industries [12], and so on. Actually, modern complex industrial processes are typical hybrid systems, in which continuous dynamic processes interact with discrete events.…”

Section: Introductionmentioning

confidence: 99%

A Modelling and Control Approach for a Type of Mixed Logical Dynamical System Using in Chilled Water System of Refrigeration System

Yan

Chu

Liu

et al. 2019

Mathematical Problems in Engineering

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The chilled water system of central air conditioning is a typical hybrid system. The dynamic adjustment of cooling capacity based on hybrid system can achieve accurate temperature control and real-time energy saving. Mixed logical dynamical (MLD) systems have advantage for solving constrained optimization problems of this type of case by numerical methods. This paper proposes a novel modified type of MLD system, which enhances the model applicability and improves the switching flexibility and control effect for the framework. In order to meet the needs of cooling capacity and energy saving, the optimal control problem is transformed as MIQP problem by defined performance index. As a numeral example of application, the model and control method is used in pumps group control for variable water volume in chilled water system of central air conditioning. At last, the dynamic and energy-saving effects of the system are simulated, which shows the ideal control results.

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Hybrid Control System for a Future Small Aircraft

Cited by 9 publications

References 3 publications

Longitudinal Robust Controller for Excellent Handling Qualities Design of a General Aviation Aircraft using QFT

Longitudinal Robust Controller for Excellent Handling Qualities Design of a General Aviation Aircraft using QFT

Stick-free Flight Stability Problem Revisited: A Modeling and Simulation Approach

A Modelling and Control Approach for a Type of Mixed Logical Dynamical System Using in Chilled Water System of Refrigeration System

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