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Intrinsic Sampling-Aware Discrete-Time Geometric Backstepping for Aggressive Quadrotor Tracking on SO(3)

This paper addresses a well-recognized inconsistency arising in sampled implementations of nonlinear geometric control: continuous-time (CT) Lya- punov stability does not, in general, guarantee a decreas- ing discrete-time (DT) Lyapunov difference under non- negligible sampling effects, potentially leading to dis- crepancies between predicted and implemented closed- loop behavior. To resolve this issue for quadrotor trajec- tory tracking, an intrinsic DT geometric backstepping framew...

The evolution characteristics of electrical resistance response of filled conductive polymer composites under cyclic loading by modelling strain sensing behavior

Filled conductive polymer composites (CPCs) under cyclic loading often exhibit resistance attenuation, shoulder peaks, baseline drift, and hysteresis, which are beyond the explanatory capability of classical piezoresistive theory, particularly regarding nonmonotonic responses and cyclic evolution. In this work, a strain sensing model is established for cyclic loading by considering the reversible and irreversible deformation behaviors, conductive network rearrangement, and interfacial effects...

The Wiener–Hopf Technique in Computational Electromagnetics: Part 1: Fundamentals

The Wiener-Hopf technique provides an essential analytical and semi-analytical methodology in applied mathematics and mathematical physics for solving boundary-value problems, formulated by means of partial differential equations and/or integral equations. By exploiting the properties of the formulation in spectral domain after the application of integral transformation, rigorous solutions can be obtained for computational physics problems. In electromagnetics the method allows effective anal...

Design Methodology of a Test Rig for a Mechanical Power Take-Off System for Ocean Wave Energy Conversion

This paper presents the design methodology and analytical sizing of a laboratory test rig for a mechanical power take-off (PTO) system for ocean wave energy conversion. The PTO comprises dual racks, pinions with freewheel clutches, a toothed-belt transmission, a planetary speed multiplier and a flywheel provision. The rig architecture couples prescribed linear excitation with controllable rotary loading and synchronized force, torque, position and speed acquisition. Ideal kinematic relations ...

Real-time estimation of high-resolution flow fields and reduced-order coordinates from event-based imaging velocimetry

A data-driven framework is proposed to estimate high-resolution (HR) velocity fields and reduced-order flow coordinates from coarse real-time event-based imaging velocimetry (rt-EBIV) measurements. Low-resolution (LR) data are retrieved through fast event analysis on a coarse grid. During offline training, the LR/HR mapping and a linear dynamical model in a proper orthogonal decomposition (POD)-based reduced-order space are identified. Online, each incoming LR snapshot is projected onto the L...

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