This paper presents a practical design perspective on multivariable feedback control problems. It reviews the basic issue-feedback in face of uncertainties-and generalizes known single-input, single-output (SISO) statements and constraints problem to multiinput, multioutput (MIMO) cases. Two major MIMO approaches are then evaluated context these results.

This paper describes an adjustment procedure for observer-based linear control systems which asymptotically achieves the same loop transfer functions (and hence relative stability, robustness, and disturbance rejection properties) as full-state feedback implementations.

This paper examines the robustness properties of existing adaptive control algorithms to unmodeled plant high-frequency dynamics and unmeasurable output disturbances. It is demonstrated thai there exist two infinite-gain operators in nonlinear dynamic system which determines time-evolution parameter errors. The pragmatic implication existence such that 1) sinusoidal reference inputs at specific frequencies and/or 2) disturbances any frequency (including dc), can cause loop gain increase...

This paper provides a tutorial overview of the LQG/LTR design procedure for linear multivariable feedback systems. is interpreted as solution specific weighted H <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> -tradeoff between transfer functions in frequency domain. Properties this are examined both minimum-phase and nonminimum-phase leads to formal weight augmentation case which permits essentially arbitrary specification system...

Control engineers often design feedback control systems for inherently unstable systems, to keep them operating safely. In such cases, there are fundamental limitations on the achievable sensitivity function. The article discusses potentially serious consequences of constraints, input saturation, and instability. Inadequacies in cases have led deaths.

The Panel on Future Directions in Control, Dynamics, and Systems was formed April 2000 to provide a renewed vision of future challenges opportunities the control field, along with recommendations government agencies, universities, research organizations ensure continued progress areas importance industrial defense base. panel released report 2002, intent which is raise overall visibility control, highlight its applications national interest, indicate some key trends that are important for...

This paper describes a new procedure for selecting weighting matrices in linear-quadratic optimal control designs. The is based on asymptotic modal characteristics of multivariable LQ-regulators as weights tend to zero. behavior both eigenvalues and eigenvectors used provide complete, unique specification the matrices. illustrated with simplified lateral-directional flight design example.

We experimentally and numerically investigate the spectral temporal structure of mid-infrared (mid-IR) filaments in bulk dielectrics with normal anomalous group velocity dispersion (GVD) pumped by a 2.1 μm optical parametric chirped-pulse amplifier (OPCPA). The formation stable robust several microjoules pulse energy is observed. demonstrate supercontinuum that spans more than three octaves from ZnS GVD regime self-compression mid-IR to sub-two-cycle duration CaF2 regime. experimental...

The parameter identification problem in the theory of adaptive control systems is considered from point view stochastic approximation. A generalized algorithm for on-line a linear discrete-time system using noisy input and output measurements presented shown to converge mean-square sense. requires knowledge noise variances involved. It that this requirement disadvantage associated with schemes based on minimum mean-square-error criteria. paper also presents two off-line which utilize...

We report the generation of coherent water-window soft x-ray harmonics in a neon-filled semi-infinite gas cell driven by femtosecond multi-mJ mid-infrared optical parametric chirped-pulse amplification (OPCPA) system at 1 kHz repetition rate. The cutoff energy was extended to ∼450 eV with 2.1 μm driver wavelength and photon flux photons/s/1% bandwidth obtained 350 eV. A comparable observed nitrogen K-edge 410 This is first demonstration harmonic up from OPCPA system. Finally, this suitable...

A systematic design methodology for proportional-integral-derivative (PID) controllers is presented. Starting from data sets, a model of the system and its uncertainty bounds are obtained. The parameters controller tuned by convex optimization algorithm, minimizing weighted difference between actual loop transfer function target in an /spl Lscr//sub 2///spl infin// sense. selection guided identified uncertainty. problem disjoint sets and/or different models same also addressed. method has...

The results on robustness theory presented here are extensions of those given in [1]. basic innovation these new is that they utilize minimal additional information about the structure modeling error as well its magnitude to assess feedback systems for which tests based alone inconclusive.

This paper describes a generalized quadratic weight selection procedure based on asymptotic modal properties of linear-quadratic regulators as control weights tend to zero. Explicit formulas are developed for weighting matrices which produce an eigenstructure consisting <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">p \leq n-m</tex> finite modes, with the rest tending infinity in selectable Butterworth patterns or determined by other secondary...

This paper describes an adaptive flight control system design for NASA's F-8 digital fly-by-wire research aircraft. implements explicit parallel maximum likelihood identification algorithm to estimate key aircraft parameters. The estimates are used compute gains in simplified quadratic-optimal command augmentation laws. Design details the laws and identifier presented, performance evaluation results from NASA Langley's Simulator summarized.

This correspondence considers the on-line parameter identification of a forced linear discrete-time dynamic system from sequence white-noise-corrupted output measurements. In contrast to other approaches, proposed stochastic approximation algorithm does not require knowledge noise statistics and converges true value parameters in mean-square sense. If input measurements are also corrupted with white noise, an additional term depending on variance is required.

We investigate the efficient generation of low-divergence high-order harmonics driven by waveform-optimized laser pulses in a gas-filled hollow waveguide. The drive waveform is obtained synthesizing two-color pulses, optimized such that highest harmonic yields are emitted from each atom. Optimization gas pressure and waveguide configuration has enabled us to produce bright spatially coherent extending extreme ultraviolet soft x rays. Our study on interplay among mode, atomic dispersion,...

We report on a diode-pumped, hybrid Yb-doped chirped-pulse amplification (CPA) laser system with compact pulse stretcher and compressor, consisting of fiber preamplifiers, room-temperature Yb:KYW regenerative amplifier (RGA), cryogenic Yb:YAG multi-pass amplifiers. The RGA provides relatively broad bandwidth thereby long duration to mitigate B-integral in the CPA chain. ~1030-nm pulses are amplified up 70 mJ at 1-kHz repetition rate, currently limited by available optics apertures, then...

We demonstrate a 0.56-GW, 1-kHz, 4.2-ps, 2.74-mJ deep-ultraviolet (DUV) laser at ∼257.7 nm with beam propagation factor (M2) of ∼2.54 from frequency-quadrupled cryogenic multi-stage Yb-doped chirped-pulse amplifier. The frequency quadrupling is achieved using LiB3O5 and β-BaB2O4 crystals for near-infrared (NIR)-to-green green-to-DUV conversion, respectively. An overall NIR-to-DUV efficiency ∼10% has been achieved, which currently limited by the thermal-induced phase mismatching DUV-induced...

This paper proposes a novel framework to handle multi-agent path finding problem under limited communication range constraint, where all agents must have connected channel the rest of team. Many existing approaches (e.g., leader-follower platooning) overcome computational challenges planning in this domain by one agent at time fixed order. However, can become stuck during planning, limiting their practical utility dense-clutter environments. To limitation, we develop dynamic leading finding,...

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The planning ability of Large Language Models (LLMs) has garnered increasing attention in recent years due to their remarkable capacity for multi-step reasoning and generalize across a wide range domains. While some researchers emphasize the potential LLMs perform complex tasks, others highlight significant limitations performance, particularly when these models are tasked with handling intricacies long-horizon reasoning. In this survey, we critically investigate existing research on use...