Research papers
5,883 papers · NASA NTRS, NTSB, FAA CAMI
NASA NTRS · 1,269 NTSB Safety Studies · 12 NTSB Aircraft Accident Reports · 17 Embry-Riddle Scholarly Commons · 1,993
5,883 matches
- arXiv 2024 ARXIV arXiv preprint
Goal-Oriented UAV Communication Design and Optimization for Target Tracking: A MachineLearning Approach
To accomplish various tasks, safe and smooth control of unmanned aerial vehicles (UAVs) needs to be guaranteed, which cannot be met by existing ultra-reliable low latency communications (URLLC).
- arXiv 2024 ARXIV arXiv preprint
A Robust Clustering Scheme for Vehicular Communication Networks
Clustering, as a technique for grouping nodes in geographical proximity together, in vehicular communication networks, is a key technique to enhance network robustness and scalability despite challenges such as mobility …
- arXiv 2024 ARXIV arXiv preprint
City-Wide Low-Altitude Urban Air Mobility: A Scalable Global Path Planning Approach via Risk-Aware Multi-Scale Cell Decomposition
The realization of Urban Air Mobility (UAM) necessitates scalable global path planning algorithms capable of ensuring safe navigation within complex urban environments.
- arXiv 2024 ARXIV arXiv preprint
Real-time Trajectory Optimization of Impaired Aircraft based on Steady State Manoeuvres
Aircraft failures alter dynamics, diminishing manoeuvrability. Such manoeuvring flight envelope variations, governed by the aircraft's complex nonlinear dynamics, are unpredictable by pilots and existing flight managemen…
- arXiv 2024 ARXIV arXiv preprint
Deciphering Air Travel Disruptions: A Machine Learning Approach
This research investigates flight delay trends by examining factors such as departure time, airline, and airport. It employs regression machine learning methods to predict the contributions of various sources to delays.
- arXiv 2024 ARXIV arXiv preprint
Vertiport Terminal Scheduling and Throughput Analysis for Multiple Surface Directions
Vertical Take-Off and Landing (VTOL) vehicles are gaining traction in both the delivery drone market and passenger transportation, driving the development of Urban Air Mobility (UAM) systems.
- arXiv 2024 ARXIV arXiv preprint
Modelling the three-dimensional, diagnostic anisotropy field of an ice rise
Polar ice develops anisotropic crystal orientation fabrics under deformation, yet ice is most often modelled as an isotropic fluid. We present three-dimensional simulations of the crystal orientation fabric of Derwael Ic…
- NASA NTRS 2024 ARC Presentation
Investigating the Causes and Consequences of Controlled Rest on the Flight Deck
INTRODUCTION: Long and irregular working hours can lead to fatigue in aviation operations. In some regions, a short nap taken on the flight deck (known as controlled rest) can be used as a countermeasure to unexpected in…
- NASA NTRS 2024 ARC Presentation
Helicopter Pilot Evaluations of the Airborne Collision Avoidance System Xr in a High-Fidelity Motion Simulation
New aircraft and aerial Urban Air Mobility operations require updated technologies to maintain vehicle separation during flight. Specifically, higher-density airspace will need more than traditional air traffic control t…
- NASA NTRS 2024 GSFC Accepted Manuscript (Version with final changes)
Inverse Modeling of the Initial Stage of the 1991 Pinatubo Volcanic Cloud Accounting for Radiative Feedback of Volcanic Ash
The way volcanic clouds evolve is very sensitive to the initial spatial 3D distributions of volcanic materials, which are often unknown. In this study, we conducted inverse modeling of the Mt.
- NASA NTRS 2024 LaRC Presentation
Aeroheating Predictions for a Hypersonic, Turbulent Near-Wake
The accuracy of heating predictions using various turbulence models is examined for an axisymmetric near-wake at Mach 6. The CFD predictions are compared with experimental data collected under AGARD Working Group 18 on t…
- arXiv 2024 ARXIV arXiv preprint
A phase-field model for wet snow metamorphism
The microstructure of snow determines its fundamental properties such as the mechanical strength, reflectivity, or the thermo-hydraulic properties.
- arXiv 2024 ARXIV arXiv preprint
Convection in the active layer speeds up permafrost thaw in coarse grained soils
Permafrost thaw is a major concern raised by the ongoing climate change. An understudied phenomenon possibly affecting the pace of permafrost thaw is the onset of convective motions within the active layer caused by the …
- arXiv 2024 ARXIV arXiv preprint
Marangoni-driven freezing dynamics of supercooled binary droplets
Solidification of droplets is of great importance to various technological applications, drawing considerable attention from scientists aiming to unravel the fundamental physical mechanisms.
- arXiv 2024 ARXIV arXiv preprint
Gravity-driven viscous flow over partially lubricated bed
We present an investigation into the response of a viscous fluid flowing over a sloped bed across a spatially finite patch of basal lubrication.
- NASA NTRS 2024 ARC Conference Paper
Helicopter Pilot Evaluations of the Airborne Collision Avoidance System Xr in a High-Fidelity Motion Simulation
New aircraft and aerial Urban Air Mobility operations require updated technologies to maintain vehicle separation during flight. Specifically, higher-density airspace will need more than traditional air traffic control t…
- Semantic Scholar 2024 Article (AIAA AVIATION FORUM AND ASCEND 2024)
Design of a Six-Tiltrotor Concept Vehicle for Urban Air Mobility
NASA has developed a series of aircraft concepts known as reference vehicles for urban air mobility operations to facilitate research and development, enabling system-level comparisons between design candidates.
- arXiv 2024 ARXIV arXiv preprint
Piecewise constant tuning gain based singularity-free MRAC with application to aircraft control systems
This paper introduces an innovative singularity-free output feedback model reference adaptive control (MRAC) method applicable to a wide range of continuous-time linear time-invariant (LTI) systems with general relative …
- arXiv 2024 ARXIV arXiv preprint
Sampling-Based Hierarchical Trajectory Planning for Formation Flight
Formation flight of unmanned aerial vehicles (UAVs) poses significant challenges in terms of safety and formation keeping, particularly in cluttered environments.
- arXiv 2024 ARXIV arXiv preprint
Koopman Analytical Modeling of Position and Attitude Dynamics: a Case Study for Quadrotor Control
This research presents a novel, analytical, Koopman Operator based formulation for position and attitude dynamics which can be used to derive control strategies for underactuated systems.
- arXiv 2024 ARXIV arXiv preprint
Measuring the local mechanical properties of a floating elastic sheet
Polar regions are covered by sea ice, which can be seen as a thin solid elastic sheet with heterogeneous mechanical properties. The dynamics of deformation of a floating solid sheet are primarly governed by gravity, wate…
- arXiv 2024 ARXIV arXiv preprint
Energy-Aware Holistic Optimization in UAV-Assisted Fog Computing: Attitude, Trajectory, Task Assignment
Unmanned Aerial Vehicles (UAVs) have significantly enhanced fog computing by acting as both flexible computation platforms and communication mobile relays.
- arXiv 2024 ARXIV arXiv preprint
Energy-Aware UAV-Enabled Target Tracking: Online Optimization with Location Constraints
For unmanned aerial vehicle (UAV) trajectory design, the total propulsion energy consumption and initial-final location constraints are practical factors to consider.
- arXiv 2024 ARXIV arXiv preprint
Distilling Tiny and Ultra-fast Deep Neural Networks for Autonomous Navigation on Nano-UAVs
Nano-sized unmanned aerial vehicles (UAVs) are ideal candidates for flying Internet-of-Things smart sensors to collect information in narrow spaces.
- arXiv 2024 ARXIV arXiv preprint
Reconfigurable Intelligent Surface for Sensing, Communication, and Computation: Perspectives, Challenges, and Opportunities
Forthcoming 6G networks have two predominant features of wide coverage and sufficient computation capability. To support the promising applications, Integrated Sensing, Communication, and Computation (ISCC) has been cons…
- arXiv 2024 ARXIV arXiv preprint
A Graph-based Adversarial Imitation Learning Framework for Reliable & Realtime Fleet Scheduling in Urban Air Mobility
The advent of Urban Air Mobility (UAM) presents the scope for a transformative shift in the domain of urban transportation. However, its widespread adoption and economic viability depends in part on the ability to optima…
- arXiv 2024 ARXIV arXiv preprint
Trajectory Tracking for Unmanned Aerial Vehicles in 3D Spaces under Motion Constraints
This article presents a three-dimensional nonlinear trajectory tracking control strategy for unmanned aerial vehicles (UAVs) in the presence of spatial constraints.
- Semantic Scholar 2024 Article (American Control Conference)
Optimal Charging with Active Thermal Management for eVTOL Aircraft Battery Packs
Electric vertical takeoff and landing (eVTOL) aircraft operation often requires the battery packs to be charged and thermally conditioned to a given range of state-of-charge (SOC) and temperature for the next flight in m…
- arXiv 2024 ARXIV arXiv preprint
Adaptive Backstepping and Non-singular Sliding Mode Control for Quadrotor UAVs with Unknown Time-varying Uncertainties
This paper presents a novel quaternion-based nonsingular control system for underactuated vertical-take-off and landing (VTOL) Unmanned Aerial Vehicles (UAVs).
- arXiv 2024 ARXIV arXiv preprint
Collaborative Secret and Covert Communications for Multi-User Multi-Antenna Uplink UAV Systems: Design and Optimization
Motivated by diverse secure requirements of multi-user in UAV systems, we propose a collaborative secret and covert transmission method for multi-antenna ground users to unmanned aerial vehicle (UAV) communications.
- arXiv 2024 ARXIV arXiv preprint
An Open-source Hardware/Software Architecture and Supporting Simulation Environment to Perform Human FPV Flight Demonstrations for Unmanned Aerial Vehicle Autonomy
Small multi-rotor unmanned aerial vehicles (UAVs), mainly quadcopters, are nowadays ubiquitous in research on aerial autonomy, including serving as scaled-down models for much larger aircraft such as vertical-take-off-an…
- arXiv 2024 ARXIV arXiv preprint
Performance Analysis of UAV-Assisted RF-UOWC Systems
This paper introduces a relay-assisted solution for downlink communications in a mixed system of Radio Frequency (RF) and Underwater Optical Wireless Communications (UOWC) technologies.
- arXiv 2024 ARXIV arXiv preprint
UAV Trajectory Planning with Path Processing
This paper examines the influence of initial guesses on trajectory planning for Unmanned Aerial Vehicles (UAVs) formulated in terms of Optimal Control Problem (OCP).
- arXiv 2024 ARXIV arXiv preprint
Quaternion-based Adaptive Backstepping Fast Terminal Sliding Mode Control for Quadrotor UAVs with Finite Time Convergence
This paper proposes a novel quaternion-based approach for tracking the translation (position and linear velocity) and rotation (attitude and angular velocity) trajectories of underactuated Unmanned Aerial Vehicles (UAVs)…
- arXiv 2024 ARXIV arXiv preprint
Fleet Size and Spill for UAM Operation under Uncertain Demand
Variation and imbalance in demand poses significant challenges to Urban Air Mobility (UAM) operations, affecting strategic decisions such as fleet sizing.
- Flight Safety Foundation 2024 FSF FSF / AeroSafety World
Go-Around Safety Forum Findings
Foundation Go-Around Safety Forum technical findings — examines why pilots fail to execute go-arounds when criteria are met (stabilized approach gate not met, energy state out of envelope, traffic conflict).
- arXiv 2024 ARXIV arXiv preprint
A flexured-gimbal 3-axis force-torque sensor reveals minimal cross-axis coupling in an insect-sized flapping-wing robot
The mechanical complexity of flapping wings, their unsteady aerodynamic flow, and challenge of making measurements at the scale of a sub-gram flapping-wing flying insect robot (FIR) make its behavior hard to predict.
- Semantic Scholar 2024 Article (ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences)
Towards enhancing the safety of Advanced Air Mobility: Automatic 3D inter-urban modelling for improved weather monitoring
Abstract. Advanced Air Mobility (AAM) is an emerging sector that aims to optimise transportation in urban and interurban environments using Unmanned Aerial Vehicles (UAVs).
- arXiv 2024 ARXIV arXiv preprint
Modelling and Hovering Stabilisation of a Free-Rotating Wing UAV
We propose a multibody model of a freewing UAV. This model allows obtaining simulations of the UAV's behaviour and, in the future, to design a control law stabilising the entire flight envelope (hovering and forward flig…
- arXiv 2024 ARXIV arXiv preprint
Optimal DC-link Voltage from Weight and Loss Perspective for eVTOLs
Electric vertical takeoff and landing (eVTOL) aircraft are emerging as a modern transportation solution aimed at reducing urban traffic congestion and improving the carbon footprint.
- arXiv 2024 ARXIV arXiv preprint
Hierarchical Framework for Optimizing Wildfire Surveillance and Suppression using Human-Autonomous Teaming
The integration of manned and unmanned aircraft can help improve wildfire response. Wildfire containment failures occur when resources available to first responders, who execute the initial stages of wildfire management …
- Semantic Scholar 2024 Article (Volume 3A: Combustion, Fuels, and Emissions)
Considerations for Hydrogen Fueled Aerospace Gas Turbine Combustion Sub-System Design
As part of its commitment to the decarbonization of the aviation sector and the UN Race to Zero global campaign, Rolls-Royce is actively developing hydrogen combustion gas turbine engine technology capable of powering a …
- arXiv 2024 ARXIV arXiv preprint
Characterization of Lightweight GPS Disciplined Oscillators for Distributed UAV Measurement Applications
With an increasing variety of measurement applications using sensing nodes on unmanned aerial vehicles (UAVs), global positioning system (GPS) and global navigation satellite system (GNSS) disciplined oscillators (GPSDOs…
- arXiv 2024 ARXIV arXiv preprint
Towards Probabilistic Clearance, Explanation and Optimization
Employing Unmanned Aircraft Systems (UAS) beyond visual line of sight (BVLOS) is an endearing and challenging task. While UAS have the potential to significantly enhance today's logistics and emergency response capabilit…
- arXiv 2024 ARXIV arXiv preprint
Autonomous Decision Making for Air Taxi Networks
Future urban air mobility systems are expected to be operated by rideshare companies as fleets, which will require fully autonomous air traffic control systems and an order of magnitude increase in airspace capacity.
- arXiv 2024 ARXIV arXiv preprint
SkyGrid: Energy-Flow Optimization at Harmonized Aerial Intersections
The rapid evolution of urban air mobility (UAM) is reshaping the future of transportation by integrating aerial vehicles into urban transit systems.
- arXiv 2024 ARXIV arXiv preprint
Runtime Verification on Abstract Finite State Models
Finite-state models are ubiquitous in the study of concurrent systems, especially controllers and servers that operate in a repetitive cycle.
- arXiv 2024 ARXIV arXiv preprint
Control of Unknown Quadrotors from a Single Throw
This paper presents a method to recover quadrotor UAV from a throw, when no control parameters are known before the throw. We leverage the availability of high-frequency rotor speed feedback available in racing drone har…
- arXiv 2024 ARXIV arXiv preprint
Morphodynamics of melting ice over turbulent warm water streams
We investigate the morphodynamics of an ice layer over a turbulent stream of warm water using numerical simulations. At low water speeds, characteristic streamwise undulations appear, which can be explained by the Reynol…
- arXiv 2024 ARXIV arXiv preprint
Charged drop impinging on particles dispersed over a metallic plate: A method of particle cleaning
An electric field applied to a droplet impinging on a hydrophobic surface has an extensive variety of applications, including ant-icing, heat transfer enhancement, self-cleaning, droplet manipulation, and electrostatic s…