Design of decoupling control system for the azimuth control of balloon-borne mission

Zhang, Dawei; Zhou, Jing; Huang, Wanning

doi:10.1109/chicc.2016.7555071

Cited by 3 publications

(5 citation statements)

References 1 publication

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“…The azimuth pointing control of balloon-borne gondolas is most often designed solely with a model of the torsion of the flight train [7][8][9][10][11][12][13][14][15]. However, in presence of a coupling between the gondola's azimuth and the pendulum oscillations of the system, the azimuth control can excite and even destabilize the pendulum modes.…”

Section: Stabilitymentioning

confidence: 99%

“…Two types of dynamics are generally distinguished in the modeling of balloon systems. About the vertical axis, the torsion of the flight chain is traditionally modeled as a mass-spring system [7][8][9][10][11][12][13][14][15]. Although the stiffness is generally experimentally determined by system identification, which requires to deploy the whole system and process in-flight data, the bifilar pendulum model allows to analytically derive the stiffness of balloon flight chains [16,17].…”

Section: Introductionmentioning

confidence: 99%

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Modeling and stability of balloon-borne gondolas with coupled pendulum-torsion dynamics

Kassarian

Sanfedino

Alazard

et al. 2021

Aerospace Science and Technology

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Section: Stabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling and stability of balloon-borne gondolas with coupled pendulum-torsion dynamics

Kassarian

Sanfedino

Alazard

et al. 2021

Aerospace Science and Technology

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“…Figure 3 shows the simplified schematic diagram for the working principle of the reaction flywheel azimuth control. Figure 3, one could find that the main objective of the decoupler design is to eliminate the influence of the coupling torque and then convert all the control torques T w output by the flywheel into control torques T g used for controlling the rotation of the gondola directly [29]. In such a way, a higher azimuth control accuracy can be obtained by appropriate parameter setting and/or correction for the azimuth controller.…”

Section: Influence Of Coupling Torquementioning

confidence: 99%

“…e decoupler design consists of the following three steps. Firstly, design a decoupling mechanism to reduce the torsional interference torque of the suspending rope to a certain magnitude [29] and then adopt the decoupling mechanism-based torque generator to generate the desired torque to compensate or offset the coupling torque caused by external interference [30]. Since the weak moment caused by uncertain factors is not easy to be detected by hardware, the final step is to devise a state observer to identify the existence of the coupling moment.…”

Section: Integrated Decoupling Design As Shown Inmentioning

confidence: 99%

An Integrated Decoupling Device for Azimuth Control of a Balloon-Borne Gondola

Wang

et al. 2020

Mathematical Problems in Engineering

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Controlling and maintaining the orientation of the balloon-borne gondola for high-altitude flight is a prerequisite for ensuring the pointing control of observation instruments. When the balloon-borne gondola is flying in the stratosphere of the atmosphere, the existing external interferences will be converted into the coupling moment to the azimuth control system. Meanwhile, those uncertain factors and the frictional nonlinearity of the control system will also cause a certain magnitude of coupling moment. The existence of such coupling moment largely impacts on the accuracy and stability of the orientation control for the angular momentum exchange devices of the balloon-borne gondola. To address such an issue, this paper proposes and implements a novel type of integrated decoupler device. With this decoupler adopted, the aziDmuth control system could sense the existence of coupling torque and azimuth fluctuations quickly and suppress the influences of external interference, uncertain factors, and system structure nonlinearity on the azimuth control effectively, thereby improving the control accuracy of the azimuth control system. Both simulations and experiments are conducted to verify the effectiveness of the proposed device. The results show that the integration of the decoupler and the controller of the azimuth control system provide the azimuth control of the balloon-borne gondola with high accuracy and stability. Such a decoupler device design has a broad potential and could not only be used for balloon-borne gondola control but also could be applied onto other control systems using angular momentum exchange devices as actuators.

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“…The earliest dynamical models of stratospheric balloonborne systems are found in 1975 in a technical report from NASA [10] motivated by the attitude determination for the LACATE experiment, and developed further by the same authors [11][12][13]. About the vertical axis, the torsion of the flight chain is traditionally modeled as a mass-spring system [14][15][16][17][18][19][20][21][22]. Although the stiffness is generally experimentally determined by system identification, which requires to deploy the whole system and process in-flight data, the bi-filar pendulum model allows predicting analytically the stiffness of balloon flight chains [23,24].…”

Section: Introductionmentioning

confidence: 99%

Modeling of stratospheric balloons and robust line-of-sight pointing control

Kassarian¹,

Sanfedino

Alazard

et al. 2023

CEAS Space J

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This paper investigates state-of-the-art modeling and control techniques for the robust line-of-sight pointing control of an optical payload on-board a stratospheric balloon, to meet stringent pointing requirements in the context of astronomy missions. Previous experience shows that the pointing performance of such systems is essentially limited by the rejection of the natural pendulum-like oscillations of the flight chain. This observation justifies the need for a model that accurately predicts such flight conditions that cannot be replicated in laboratory, and for a systematic methodology addressing the line-of-sight controller design to reject these flexible dynamics excited by wind disturbances. Moreover, it is sought to ensure robust stability and performance to the parametric uncertainties inherent to balloon-borne systems, such as complex balloon's properties or release of ballast throughout the flight, especially since experimental validation is limited. In this paper, a first dynamical model of the complete system is proposed, based on Lagrangian mechanics; the comparison with flight data show that the frequency content of the platform's motion is accurately predicted. Then, a multibody approach is applied to derive a second model taking into account the parametric uncertainties with the Linear Fractional Transformation representation. Finally, the control of the line-of-sight is tackled as a robust, structured H 2 ∕H ∞ problem that improves the performance with regard to traditional PID controller. A -sensitivity analysis is also proposed to identify the most sensitive parameters and verify the performance.

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Design of decoupling control system for the azimuth control of balloon-borne mission

Cited by 3 publications

References 1 publication

Modeling and stability of balloon-borne gondolas with coupled pendulum-torsion dynamics

Modeling and stability of balloon-borne gondolas with coupled pendulum-torsion dynamics

An Integrated Decoupling Device for Azimuth Control of a Balloon-Borne Gondola

Modeling of stratospheric balloons and robust line-of-sight pointing control

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