Modified Order-Reduction Method for Distributed Control of Multi-Spacecraft Networks With Time-Varying Delays

This paper is concerned with the study of scalability in network systems affected by communication delays and disturbances. The case considered is when the agents are heterogeneous, have a possibly nonlinear dynamics and communicate via a possibly nonlinear coupling. After formalizing the notion of scalability for these networks, we give two sufficient conditions to assess this property. These results can be used to study both leader and leaderless networks and also allow to consider the case when the desired configuration of the system changes over time. We show how our conditions can be turned into design guidelines to guarantee network scalability and illustrate their effectiveness via numerical examples.

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“…In this sense, our results relax an assumption made to study stability in e.g. [28] and related references.…”

Section: Technical Resultssupporting

confidence: 80%

Scalability in Nonlinear Network Systems Affected by Delays and Disturbances

Xie

Russo

Middleton

2021

IEEE Trans. Control Netw. Syst.

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“…During the past decades, spacecraft attitude control has become a major research topic in the aerospace domain, because it can be used to perform various advanced tasks in the aerospace domain including deep space exploration [1], space on-orbit services [2,3], and spacecraft proximity operations [4,5]. The main research issues associated with the spacecraft attitude control system design include highly nonlinear characteristics owing to the presence of rigid-flexible coupled structures [6], parameter uncertainties [7], external disturbances and actuator faults [8][9][10][11], input nonlinearity [12,13], and formation control [14][15][16]. During the previous decade, considerable design results have been achieved with respect to spacecraft attitude control.…”

Section: Introductionmentioning

confidence: 99%

Adaptive fuzzy backstepping control for attitude stabilization of flexible spacecraft with signal quantization and actuator faults

Liu

Duan

2021

Sci. China Inf. Sci.

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In this study, the fault-tolerant attitude control of flexible spacecraft is investigated over digital communication channels, where a uniform quantizer is considered with respect to the sensor signals and controller indexes. Further, an adaptive fuzzy backstepping control strategy has been developed for the considered attitude stabilization issue, where the adaptive fuzzy logic method is used to approximate the rigid-flexible coupled nonlinearity of the spacecraft. In this design, the online adjusting quantizer parameters are injected into the controller gains to simultaneously compensate for the quantization errors and timevarying actuator faults. In the proposed control method, the attitude stabilization task is achieved in the presence of external disturbances, time-varying actuator faults, and signal quantization. Finally, the practical examples are compared to demonstrate the effectiveness of the proposed control strategy.

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“…The basic and fundamental task of consensus problems is to find an appropriate distributed protocol to ensure that some physical or virtual quantities of interest can reach an agreed state among all agents. Over recent decades, many efforts have been devoted to addressing various scenarios, including the consensus problem for homogeneous MAS [3, 4], heterogeneous MAS [5, 6], and Takagi–Sugeno (T–S) fuzzy MAS [7, 8]. More studies can be found in [9–11].…”

Section: Introductionmentioning

confidence: 99%