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RISRamp Tracking in Systems With Nonminimum Phase Zeros: One and a Half Integrator Approach
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In this paper, a simple fractional calculusbased control law is proposed for asymptotic tracking of ramp reference inputs in dynamical systems. Without need to add any zero to the loop transfer function, the proposed ...
Estimation of the Order and Parameters of a Fractional Order Model From a Noisy Step Response Data1
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper deals with integral based methods to estimate the order and parameters of simple fractional order models from the extracted noisy step response data of a process. This data can be obtained from both openloop and ...
Toward Searching Possible Oscillatory Region in Order Space for Nonlinear Fractional Order Systems
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Finding the oscillatory region in the order space is one of the most challenging problems in nonlinear fractionalorder systems. This paper proposes a method to find the possible oscillatory region in the order space for a ...
Simultaneous Compensation of the Gain, Phase, and Phase Slope
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper deals with the problem of simultaneous compensation of the gain, phase, and phaseslope at an arbitrary frequency by using a fractionalorder lead/lag compensator. The necessary and sufficient conditions for ...
Robust Stability Analysis of Distributed-Order Linear Time-Invariant Systems With Uncertain Order Weight Functions and Uncertain Dynamic Matrices
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Bounded-input bounded-output (BIBO) stability of distributed-order linear time-invariant (LTI) systems with uncertain order weight functions and uncertain dynamic matrices is investigated in this paper. The order weight ...
Analysis of Oscillations in Relay Feedback Systems With Fractional-Order Integrating Plants
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Oscillatory behavior and transfer properties of relay feedback systems with a linear plant including a fractional-order integrator are studied in this paper. An expression for system response in the time domain is obtained ...
Robust Stability Analysis of Uncertain Linear Fractional-Order Systems With Time-Varying Uncertainty for 0 < α < 2
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper focuses on the stability analysis of linear fractional-order systems with fractional-order 0<α<2, in the presence of time-varying uncertainty. To obtain a robust stability condition, we first derive a new ...
Optimal Tuning for Fractional Order Controllers: An Integer Order Approximating Filter Approach
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper offers a systematic framework for the design of suboptimal integerorder controllers based on fractionalorder structures. The proposed approach is built upon the integerorder approximations that are traditionally ...
On Robust Control of Fractional Order Plants: Invariant Phase Margin
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Recently, a robust controller has been proposed to be used in control of plants with large uncertainty in location of one of their poles. By using this controller, not only the phase margin and gain crossover frequency are ...
Adaptive Consensus Tracking for Fractional Order Linear Time Invariant Swarm Systems
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper presents an adaptive controller to achieve consensus tracking for the fractionalorder linear time invariant swarm systems in which the matrices describing the agent dynamics and the interactive dynamics between ...