This paper investigates the model reduction, using balanced realizations, of unsteady aerodynamics maneuvering flexible aircraft. The aeroelastic response vehicle, which may be subject to large wing deformations at trimmed flight, is captured by coupling a displacement-based flexible-body dynamics formulation with an aerodynamic based on vortex lattice method. Consistent linearization problem allows projection structural degrees freedom few vibration modes unconstrained vehicle but preserves...

ABSTRACT This paper presents an aeroservoelastic modeling approach to investigate dynamic load alleviation in large wind turbines with composite blades and trailing‐edge aerodynamic surfaces. The tower rotating are modeled using geometrically non‐linear beams linearized about reference conditions potentially arbitrarily structural displacements. aerodynamics of the rotor represented a unsteady vortex lattice method, resulting aeroelastic system is written state‐space description that both...

This work presents a novel design methodology for multirotor Unmanned Aerial Vehicles (UAVs).To specifically address the of vehicles with heavy lift capabilities, we have extended existing methodologies to include coaxial rotor systems which exhibit best thrust-to-volume ratio operation UAVs in urban environments.Such systems, however, come decreased aerodynamic efficiency and approach developed this can account this.The proposed included market studies been demonstrated development...

Aiming to develop methods for real-time 3D scanning of building interiors, this work evaluates the performance state-of-the-art LiDAR-based approaches simultaneous localisation and mapping (SLAM) in indoor environments. A simulation framework using ROS Gazebo has been implemented compare different based on LiDAR odometry (LOAM). The featureless environments typically found interiors commercial industrial buildings pose significant challenges SLAM frameworks, resulting drift or breakdown...

This paper investigates the linearization, using perturbation methods, of structural deformations in nonlinear flight dynamic response aircraft with slender, flexible wings. The starting point is coupling a displacement-based geometrically flexible-body dynamics formulation three-dimensional unsteady vortex lattice method. followed by linearization degrees freedom, which are assumed to be small body-fixed reference frame. translations and rotations that frame their time derivatives, describe...

This paper introduces an integrated approach for flexible-aircraft time-domain aeroelastic simulation and controller design suitable wake encounter situations. The dynamic response of the vehicle, which may be subject to large wing deformations in trimmed flight, is described by a geometrically nonlinear finite-element model. aerodynamics are modeled using unsteady vortex lattice method include arbitrary downwash distributions encounter. A consistent linearization structural degrees freedom...

In this paper, we propose an embedded optimization approach for the localization of Internet Things (IoT) devices making use range measurements from ultra-wideband (UWB) signals. Low-cost, low-power UWB radios provide time-of-arrival with decimeter accuracy over large distances. UWB-based methods have been envisioned to enable feedback control in IoT applications, particularly, GPS-denied environments, and wireless sensor networks. formulate task as a nonlinear least-squares problem based on...

Faced with the increased frequency of zoonotic spillover in recent decades, emerging vector-borne diseases from non-human primates pose a significant threat to global public health. Understanding transmission dynamics driven by arthropod vectors between wildlife populations is critical for surveillance, modelling and mitigation. Elevated canopy-level sampling valuable approach elucidating vector behaviour sylvatic transmission. However, this underutilized many regions due logistical...

Abstract An aeroservoelastic model, capturing the structural response and unsteady aerodynamics of turbine rotors, will be used to demonstrate potential active load alleviation using aerodynamic control surfaces. The model is a geometrically non‐linear composite beam, which linearized around equilibrium rotating conditions coupled with time‐domain given by 3D vortex lattice method. With much existing work relying on blade element momentum theory various corrections, use method in this paper...

In this paper we address a control problem for an autonomous tethered kite system the purpose of airborne wind energy generation. particular, design tracking controller velocity vector orientation kite. Motivated by empirical data model steering behaviour as delayed dynamical and explicitly utilise derived information design. We identify involved parameters from experimental data. To adapt to changes in operating conditions update parameter estimation on-line. present results approach...

In this paper we propose a guidance strategy for the flight control of tethered wing. We wing trajectory in cascaded approach via velocity vector orientation. particular, consider control-oriented model with an input delay to follow reference path. To account design predictor and use predictions compute lower level tracking controller. path-planning step figure-eight paths follow. The path explicitly considers parameters used controller such that limitations induced by are respected. By...

The paper investigates the coupled nonlinear aeroelasticity and flight mechanics of very flexible lightweight aircraft. A geometrically-exact composite beam formulation is used to model flexible-body dynamics, including rigid-body motions. aerodynamics are modeled by a general 3-D unsteady vortex-lattice method, which can capture instantaneous shape lifting surfaces free wake, large displacements interference effects. governing equations solved in variety ways, allowing linear time-domain...

In this letter, we present a model-based control approach for autonomous flight of kites wind power generation. Predictive models are considered to compensate delay in the kite dynamics. We apply model predictive (MPC), with objective guiding follow figure-of-eight trajectory, outer loop two level cascade. The tracking capabilities inner-loop controller depend on operating conditions and assessed via frequency domain robustness analysis. take limitations inner into account by encoding them...

In this work the dynamics of very flexible aircraft are described by a set nonlinear, multi-disciplinary equations motion. Primary structural components are represented geometrically-exact composite beam model which captures large dynamic deformations and interaction between rigid-body elastic degrees-of-freedom. addition, an implementation unsteady vortex-lattice method capable handling arbitrary kinematics is used to capture unsteady, three-dimensional flow-field around as it...

An estimation approach is presented for an autonomous tethered kite system the purpose of airborne wind energy generation. Accurate state critical to performance automatic flight controllers. We propose scheme which fuses measurements from range sensing, based on ultra-wideband radios, and inertial readings measurement unit. Ranges are measured between a transceiver fixed moving body number static beacons scattered ground. Estimates computed using multiplicative extended Kalman filtering...

The effects of strain rate and curvature on the edge flame propagation characteristics in an igniting turbulent coflowing planar jet are studied based 3-dimensional compressible Direct Numerical Simulation (DNS) with a modified single-step Arrhenius chemistry. In present configuration high-speed fluid is considered to be fuel-rich, whereas slow-moving taken fuel-lean. Consistent previous work DNS without mean flow shear, resulting from localized forced ignition at exhibits predominantly...

This paper presents a computationally efficient aeroservoelastic modeling approach for dynamic load alleviation in large wind turbines with trailing-edge aerodynamic control surfaces. The aeroelastic model is expressed directly state-space formulation and flaps are modeled the unsteady aerodynamics. linear of single rotating blade used to design Linear-Quadratic-Gaussian regulator minimizing root-bending moments, which shown provide reductions about 20% closed-loop on full turbine non-linear model.

Large-scale kites, flying high-force crosswind trajectories, have been proposed for wind power generation. A two phase operational cycle generates net positive using a ground-based motor/generator. In the traction kite flies trajectory while reeling out generator-connected tethers. low-force retraction reels in tethers and returns to start of cycle. Highly variable conditions significant uncertainty dynamics pose challenges autonomous, well-controlled flight. The control task is divided into...