In this paper, a novel fractional-order fuzzy sliding mode control strategy is developed to realize the deployment of tethered satellite system (TSS) with input saturation. The considered TSS modeled as an underactuated system. By decoupling into two subsystems, and constrained integer-order surfaces are designed for actuated unactuated respectively. Then, new hybrid manifold obtained by coupling subsliding surfaces. Adaptive algorithm used regulate coefficient in newly proposed order...

This article investigates the zero-sum game-based secure control problem for cyber-physical systems (CPS) under actuator false data injection attacks. The physical process is described as a linear time-invariant discrete-time model. Both noise and measurement are addressed in design process. An optimal Kalman filter given to estimate system states. adversary defender modeled two players. Under game framework, an infinite-horizon quadratic cost function defined. Employing dynamic programming...

In this article, a novel fractional-order nonsingular terminal sliding mode (FONTSM) control scheme is developed, which guarantees the desired deployment performance of space tethered satellite (STS) system. The presented to stabilize underactuated mission with only tension regulation. Based on model, practicable integer-order (IONTSM) controller designed realize STS system, finite-time stability. Then, improve performance, calculus introduced raise FONTSM controller, whose...

This article develops a discrete-time fractional-order sliding mode control scheme to deploy space tethered satellite, with the nonlinear predictive optimization of underactuated dynamics. Firstly, by Euler–Lagrangian mechanics, dynamical equations are derived for tether deployment, and some preliminaries calculus prepared. Secondly, model (MPC)-based hybrid manifold is designed based on nonsingular terminal mode. These two modes correspond actuated states system, whose coupling explicitly...

This letter investigates the direct trajectory optimization of free-floating space manipulator (FFSM). The main purpose is to plan joint trajectories reduce spacecraft motion due rotation during FFSM performing tasks. To improve calculation efficiency, adaptive Radau pseudospectral method (A-RPM) applied discretize system dynamics and transform formulated optimal problem into a nonlinear programming (NLP). By adaptively subdividing current segment assigning collocation points according...

A topic directory, e.g., Yahoo provides a view of document set at different levels abstraction and is ideal for the interactive exploration visualization set. We present method that dynamically generates directory from using frequent closed termset mining algorithm. Our shows experimental results equal quality to recent clustering methods has additional benefits such as automatic generation labels determination parameter.

This paper develops a novel sliding mode control strategy for the deployment of space tethered system with consideration constrained input. The simplified nonlinear dynamic model in elliptical orbits is first modeled by using Euler–Lagrange mechanical equation. Considering flexibility tether, compression or any component shear forces tether assumed to be input limitation. By introducing fractional order operator and saturation function into surface, new adaptive introduced based on proposed...

A robust control approach for three-phase two-level grid-connected power converters using an adaptive super-twisting algorithm (ASTA) is studied. cascaded structure of the proposed method employed, which consists two loops, dc-link capacitor voltage regulation loop (outer loop) and grid phase current tracking (inner loop). In outer loop, a proportional controller technique considered, designed to regulate some desired value. An extended state observer used asymptotically estimate external...

A novel contouring control structure including strategies for X-Y linear motor direct-drive table is proposed in this work. The contains two discrete-time terminal sliding mode tracking error controllers each axis and a PID controller the estimated error. As process to estimate error, universal variable-gain cross-coupling estimator designed. At last, effectiveness of proved by experiments track reference circular contour.

There exist two problems: 1) the model uncertainties caused by flexible cable and 2) oscillations asynchronous adjustment of multiple lengths, which make it difficult to achieve accurate tracking control end-effector (EE) for cable-driven parallel robots (CDPRs) in practical applications. This paper addresses a non-singular terminal sliding mode scheme with relative-coupling synchronization space (NTSM-RSC) overcome effect suppress cables simultaneously. A controller (NTSMC) is proposed...

The postal transportation network is critical in the enterprise operation, and borough its fundamental part. This paper systemically analyzes problem terms of optimization objectives, ranges, vehicle factors, time limit frequency, cost, so on. And then proposes corresponding lexicographic order linear programming model based on characteristics to minimize fixed costs costs. optimal solution derived using genetic algorithm. Simulation results indicate that has significant guidance adjust...