Longitudinal stability and control augmentation with robustness and handling qualities requirements using the two degree of freedom controller

Vargas, Francisco J.; Moreira, Fernanda Dos Santos; Paglione, Pedro

doi:10.1007/s40430-015-0444-z

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…In simple problems (like the pendulum), the solution of equation ( 8) is straightforward (Khalil, 2002). However, when the degree of difficulty increases, extracting operating conditions is also more complex; an aircraft is a good example (Brian & Frank, 2003), (Vargas, Oliveira Moreira, & Paglione, 2016).…”

Section: Equilibrium Pointsmentioning

confidence: 99%

Virtual laboratories as strategy for teaching improvement in Math Sciences and Engineering in Bolivia

Vargas

Alvarado²

2021

Br. J. Ed., Tech. Soc.

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STEM education is a strategy based on four disciplines (science, technology, engineering and mathematics), integrated in an innovative interdisciplinary approach. Although, the concept of STEM education is more relevant today, the discussion of a teaching model with special attention in the four subjects aforementioned began in the early 2000s. Taking into account this context, the strategy presented in this paper has been disseminated in Boliviaâ€™s main universities for the last five years. A country that has not yet managed to associate basic disciplines such as calculus, matrix algebra, and/or differential equations to solve problems of an applicative nature, that is, to establish the link between theory and practice. To establish the connection, it is necessary to deduce differential equations associated with practical problems; solve these equations with numerical methods, appeal to the simulation concept to later introduce programming languages like Python/VPython to build virtual laboratories. The classical problem addressed for this purpose is the satellite of two degrees of freedom.

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Section: Equilibrium Pointsmentioning

confidence: 99%

Virtual laboratories as strategy for teaching improvement in Math Sciences and Engineering in Bolivia

Vargas

Alvarado²

2021

Br. J. Ed., Tech. Soc.

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“…Mateo and Sugimoto (2015) formulated a method to tune a prefilter and the feedforward controller of the 2-DoF configuration. Vargas et al (2016) present a practical design of longitudinal stability and control augmentation system (SCAS) using a 2-DoF control scheme. Zhang and Xia (2017) used a 2-DoF control approach for nonminimum phase systems with time delay.…”

Section: Introductionmentioning

confidence: 99%

Optimal tracking in two-degree-of-freedom control systems: Coupled tank system

Teppa,

FAGGIONI,

GARCIA

2023

JART

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This article presents an optimal design of a two-degree-of-freedom (2-DoF) controller that will lead to zero asymptotic steady-state tracking error. The reference inputs are chosen from the set of steps, ramps, and other persistent signals used currently. The main idea is to transform the tracking 2-DoF problem into an equivalent state-space feedback-control synthesis one. Where, an internal model of the reference input is introduced. Then, through the linear quadratic regulator (LQR) technique, the desired performance objectives are addressed by minimizing a quadratic cost function. Finally, the computed state-feedback optimal gains are linked to the polynomials used within the 2-DoF formalism. The fundamental aspect of the design is that it only utilizes the measurable information of the plant provided by its inputs and outputs and take advantage of efficient state-space numerical algorithms. The proposed method is applied to a coupled-tank system, the results achieved confirm the effectiveness of the approach.

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“…Disturbance effect on system performance is reduced in a closed-loop control strategy with respect to an open-loop system; however, several control strategies have been developed to improve the pointing accuracy [4]. In practice, control strategies are investigated in the presence of disturbance as in [5][6][7][8]. The construction of a group of control strategies is designed based on disturbance rejection.…”

Section: Introductionmentioning

confidence: 99%

Spacecraft attitude control using model-based disturbance feedback control strategy

Bohlouri

Khodamoradi

Jalali-Naini

2018

J Braz. Soc. Mech. Sci. Eng.

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In this paper, the performance of the spacecraft attitude control system is enhanced using model-based disturbance feedback control (DFC) strategy in the presence of disturbance. This control strategy is applied to a single-axis spacecraft attitude control with thruster, reaction wheel, and magnetic torqrod actuators, separately. An anti-windup observer-based modified PI-D is utilized for each actuation system as a main controller. The controller gains are tuned using genetic algorithm when the time average of absolute value of pointing error is chosen as an objective function. The performance of DFC with the modified PI-D controller is investigated under disturbance and model uncertainties. The numerical simulation shows that the DFC strategy can reject disturbance effect and improve the pointing error for the three mentioned actuators; however, for a very large value of external disturbance, a critical value for uncertainty is observed for the thruster lag at which the pointing error is suddenly increased. For this critical value, the control system cannot tolerate any longer lag uncertainty in comparison with the two other actuation systems. Increasing the value of disturbance decreases the tolerable value of uncertainty in the thruster lag.

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Longitudinal stability and control augmentation with robustness and handling qualities requirements using the two degree of freedom controller

Cited by 4 publications

References 13 publications

Virtual laboratories as strategy for teaching improvement in Math Sciences and Engineering in Bolivia

Virtual laboratories as strategy for teaching improvement in Math Sciences and Engineering in Bolivia

Optimal tracking in two-degree-of-freedom control systems: Coupled tank system

Spacecraft attitude control using model-based disturbance feedback control strategy

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