Decoupling the flight control system of a supersonic vehicle

Tsay, Tain-Sou

doi:10.1016/j.ast.2007.05.005

Cited by 12 publications

(10 citation statements)

References 20 publications

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“…This method could improve the ability to eliminate the interference under large and medium loads. As a derivative control algorithm of speed synchronization, this idea is applied to the multichannel loading system [ 33 ]. The difference is that as the number of loading channels increases, the influence of coupling force becomes more and more prominent, severely reducing the loading accuracy, especially when increasing the loading frequency.…”

Section: Discussionmentioning

confidence: 99%

Motion Synchronous Composite Decoupling with Fewer Sensors on Multichannel Hydraulic Force Control for Aircraft Structural Loading Test System

Bai

Jiao

Yao

et al. 2018

Sensors

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The aircraft full-scale fatigue test is widely used in the modern aircraft industry for the safety of flight. Generally, the aircraft full-scale fatigue test is achieved by structural loading; multiple hydraulic actuators are used to apply load for force control. The fatigue loading test takes approximately several years. A key challenge is how to accelerate the loading frequency to shorten the total test time. Nevertheless, when pluralities of hydraulic actuator simultaneously increase the loading frequency, the mutual coupling force from the low rigidity of the aircraft structure will cause a large loading error, meaning that the test cannot be implemented. Although it is possible to reduce error by adding sensors, the force sensors need to connect several kilometers of cable. This paper proposed a novel motion synchronous composite decoupling control strategy with fewer sensors. The control method compensates the negative coupling effect of the channels by integrating the command signals and feedback signals of all channels. It can suppress coupling force and reduce errors at higher frequencies, thereby shortening the experiment time. Opposed to traditional decoupling control methods, advantages of this strategy are that it only needs force sensors and it does not need additional displacement or velocity and acceleration sensors to collect state variables for building the state space. Furthermore, it has been experimentally verified that the new motion synchronous composite decoupling control method can indeed guarantee sufficient control accuracy when the test frequency is increased. The method has great economic significance for shortening test duration.

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Section: Discussionmentioning

confidence: 99%

Motion Synchronous Composite Decoupling with Fewer Sensors on Multichannel Hydraulic Force Control for Aircraft Structural Loading Test System

Bai

Jiao

Yao

et al. 2018

Sensors

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“…For several decades in the past, tactical missile autopilot designs are dominated by single-channel-based methods. 27 However, as the AoA increases, significant coupling between the roll and yaw channels arises, 27,28 which may lead to poor performance or even instability with single-channel-based designs. To solve the matter, centralized controllers are designed using  ∞ and synthesis methods in References 29,30.…”

Section: Introductionmentioning

confidence: 99%

A hybrid search based synthesis of static output feedback controllers for uncertain systems with application to multivariable PID control

Gopmandal

Garg

2021

Intl J Robust & Nonlinear

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This article proposes a hybrid search (involving the  ∞ performance level and a positive scalar variable in sequence) based method for  ∞ synthesis of linear time-invariant (LTI) static output feedback (SOF) controllers for a class of linear systems with norm-bounded time-varying parametric uncertainties. Using an available extended linear matrix inequality (LMI) formulation of bounded real lemma, a new sufficient condition in terms of LMIs is obtained for existence of SOF controllers, where a triangular structure in the variable part of the Lyapunov matrix is introduced, unlike the diagonal structure existing in direct synthesis methods in literature. To obtain as less as possible, the part of the Lyapunov matrix which is kept fixed while computing the variable part is first obtained using a -search based method. Then with this fixed part, the final variable triangular part of the Lyapunov matrix is obtained using a single positive scalar search based LMI method to further reduce .The efficacy of the proposed method is studied on a number of benchmark examples. The method is also extended for structured SOF design. Finally, the proposed method is applied to design two-degree-of-freedom (2-DOF) multivariable proportional-integral-derivative (PID) controllers for  ∞ compensation of norm-bounded uncertain plants. A case study on designing roll-pitch-yaw integrated missile autopilots is also considered to show the efficacy of the proposed multivariable PID compensation. K E Y W O R D Shybrid search based  ∞ method, MIMO PID, norm-bounded uncertainty, skid-to-turn missiles, static output feedback

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“…As complex and highly non-linear inter-axis coupling exists, a traditional control system design method may not satisfy the control requirements of three-axis simulators. Currently, most methods use passive decoupling control to eliminate the negative coupling effect, such as the decoupling obtained from the multiplication of two measurable accelerations with three controllable output commands of the autopilot in Tsay (2007). However, all these decoupling method needs an exact model of the controlled plant, which makes it nearly impossible to apply these methods in practical engineering applications.…”

Section: Introductionmentioning

confidence: 99%

Active coupling suppression and real-time control system design and implementation for three-axis electronic flight motion simulator

Miao

Wei

Wang

2017

Transactions of the Institute of Measurement and Control

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Modelling of a three-axis electronic flight motion simulator with U-O-O structure is achieved in this paper, based on recursive Newton–Euler equations. To overcome the shortcomings of passive decoupling control methods, an active coupling torque suppression method is proposed using velocity internal feedback by analysing the influence of the coupling torque. Detailed control software and hardware implementation is given for the real-time control system. Experimental tests show the designed flight motion simulator system performs good dynamic and static performances.

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Decoupling the flight control system of a supersonic vehicle

Cited by 12 publications

References 20 publications

Motion Synchronous Composite Decoupling with Fewer Sensors on Multichannel Hydraulic Force Control for Aircraft Structural Loading Test System

Motion Synchronous Composite Decoupling with Fewer Sensors on Multichannel Hydraulic Force Control for Aircraft Structural Loading Test System

A hybrid search based synthesis of static output feedback controllers for uncertain systems with application to multivariable PID control

Active coupling suppression and real-time control system design and implementation for three-axis electronic flight motion simulator

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