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Showing 21 - 40 of 596 results
  • TASOPTjl A Julia Package for Conceptual Commercial Transport Aircraft Design
    TASOPT.jl: A Julia Package for Conceptual Commercial Transport Aircraft Design
    Prashanth, Prakash ;
    Gomez-Vega, Nicolas
    2025-09-03 | PDF
    Aircraft design is a multidisciplinary field that spans aerodynamics, structures, thermodynamics and propulsion. Prior approaches to this problem have consisted of historical correlations, empirical drag and simplified propulsion system models (Raymer, 2018; Roskam, 2002; Torenbeek, 1982). TASOPT, originally written in FORTRAN and developed by Mark ...
  • Effects of Extreme Climate Shifts to Pavement Infrastructure in Tennessee
    Effects of Extreme Climate Shifts to Pavement Infrastructure in Tennessee
    Onyango, Mbakisya ;
    Fomunung, Ignatius
    2025-09-01 | PDF
    Resilient pavement infrastructure is a dream of every transportation agency. Many factors affect the health of pavement infrastructure to include extreme climate shifts. This study evaluated the effects of climate shifts to pavement infrastructure in Tennessee. The study used AASHTOWare PMED software to predict distresses on selected pavement secti ...
  • Project 060 Analytical Methods for Expanding the AEDT Aircraft FLEET Database
    Project 060 Analytical Methods for Expanding the AEDT Aircraft FLEET Database
    Mavris, Dimitri N. ;
    Kirby, Michelle R.
    2025-09-01 | PDF
    The goal of this research is to increase the accuracy of AEDT noise and emissions modeling of aircraft not currently in the ANP database. Georgia Tech will identify, and review aircraft not currently modeled in the AEDT, and will collect information and necessary data to better understand the characteristics of these aircraft. Various statistical a ...
  • Geometric and Positional Isomer Effects on Ignition Behavior of Cycloalkanes Implications for Sustainable Aviation Fuels
    Geometric and Positional Isomer Effects on Ignition Behavior of Cycloalkanes: Implications for Sustainable Aviation Fuels
    Yang, Zhibin ;
    Faulhaber, Conor
    2025-09-01 | PDF
    This study investigates the ignition behavior of six dimethylcyclohexane (DMCH) isomers and cis-/trans-decalin, focusing on the effects of molecular geometry and substitution patterns. Ignition delay and derived cetane number (DCN) were measured using a CFR ignition quality tester under ASTM D6890 conditions. Among the DMCH isomers, cis-1,3-DMCH ex ...
  • An Experimental Evaluation of an Electronic Rotor Phase Synchronization System for Multirotor Aircraft Noise Control
    An Experimental Evaluation of an Electronic Rotor Phase Synchronization System for Multirotor Aircraft Noise Control
    Valente, Vítor T ;
    Greenwood, Eric
    2025-09-01 | PDF
    Multirotor electric vertical take-off and landing vehicles and small unmanned aircraft systems commonly use distributed electric propulsion. One approach to reducing their noise involves synchronizing rotor phase relationships to control radiated noise directionally. This paper presents a practical electronic phase synchronization method for multir ...
  • Evaluation and Development of Cost Prediction Models for Resurfacing Projects To Improve MR Analysis and Project Development
    Evaluation and Development of Cost Prediction Models for Resurfacing Projects To Improve M&R Analysis and Project Development
    Shrestha, K. Joseph ;
    Uddin, Mohammad Moin
    2025-08-01 | PDF
    Accurate preliminary cost estimates for resurfacing projects are essential to conduct a reliable Maintenance & Rehabilitation (M&R) analysis, prioritize projects, and optimize the use of available budget. However, TDOT is currently using an outdated cost per lane mile data for such analysis, and hence the results of such analysis can be less reliab ...
  • Identification of Stochastic Manufacturing Defects Within Additively Manufactured Acoustic Liners
    Identification of Stochastic Manufacturing Defects Within Additively Manufactured Acoustic Liners
    Windows, Joseph ;
    Packer, Alden
    2025-08-01 | PDF
    The exploration of novel acoustic liner designs using 3D internal lattices has become a growing topic of interest within the field of additive manufacturing (AM). However, the comparison between the acoustic liner response of computational simulation and experimental testing tends to show significant deviation. A potential cause of this deviation i ...
  • Evaluating the Performance of Novel TPMSBased Acoustic Liner Designs Suitable for Additive Manufacturing
    Evaluating the Performance of Novel TPMS-Based Acoustic Liner Designs Suitable for Additive Manufacturing
    Packer, Alden ;
    Reimann, C. Aaron
    2025-08-01 | PDF
    Acoustic liners are integral to the noise management of aircraft engines. As such, acoustic liner designs and configurations are the subject of research and development to address the acoustic requirements of novel engine layouts. Perforate sheet over honeycomb core, or single degree of freedom (SDOF), liners are the traditional system that has bee ...
  • Modeling Uncertainties in Primary Zone Soot Predictions for a RichQuenchLean Combustion System
    Modeling Uncertainties in Primary Zone Soot Predictions for a Rich-Quench-Lean Combustion System
    Karpe, Shubham Basavaraj ;
    Menon, Suresh
    2025-08-01 | PDF
    A comprehensive uncertainty quantification (UQ) of soot volume fraction (SVF) predictions in the primary zone of a Rich-Quench-Lean (RQL) combustor is presented, with particular emphasis on the modeling uncertainties in the rates of nucleation, growth, oxidation, condensation, and coagulation. Large-eddy simulations (LES) of soot formation in a rea ...
  • Human Factors Guidance for the Integration of Artificial Intelligence and Machine Learning in FAA Systems
    Human Factors Guidance for the Integration of Artificial Intelligence and Machine Learning in FAA Systems
    Smith, Philip J. ;
    Roth, Emilie M.
    2025-07-31 | PDF
    The goal of this project has been to develop a document providing guidance on the integration of artificial intelligence (AI)/machine learning (ML) technologies within information automation in FAA systems to support safety critical operations for air traffic control, traffic flow management and technical operations (maintenance). In this document ...
  • Howling of a ModelScale Nozzle Due to ShockInduced BoundaryLayer Separation at Its Exit
    Howling of a Model-Scale Nozzle Due to Shock-Induced Boundary-Layer Separation at Its Exit
    Ramsey, David N. ;
    Gavin, Joseph R.
    2025-06-01 | PDF
    The jet from a model-scale, internally mixed nozzle produced a loud howling when operated at jet Mach numbers between 0.80 and 1.00. Discrete tones dominated the noise radiated to the far field and powerful oscillations were present in the jet. To explain these observations, this paper leverages a blend of experimental acoustic and flow measurement ...
  • Upgrading Biocrude Oil into Sustainable Aviation Fuel Using ZeoliteSupported IronMolybdenum Carbide Nanocatalysts
    Upgrading Biocrude Oil into Sustainable Aviation Fuel Using Zeolite-Supported Iron-Molybdenum Carbide Nanocatalysts
    Yu, Siying ;
    He, Haozhen
    2025-06-01 | PDF
    Food waste is an underdeveloped source for production of sustainable aviation fuel (SAF). Now, there is no certified conversion process of food waste for SAF by American Society for Testing and Materials (ASTM). We report the use of zeolite-supported molybdenum carbide nanocatalysts in upgrading biocrudes, produced from food wastes through HTL, int ...
  • Signal Design Handbook A New Framework for Designing Alarms Alerts and Warnings in Air Traffic Control
    Signal Design Handbook: A New Framework for Designing Alarms, Alerts, and Warnings in Air Traffic Control
    Ruskin, Keith J. ;
    Ruskin, Anna Clebone
    2025-05-19 | PDF
    The Federal Aviation Administration’s air traffic control organization (ATO) encompasses a variety of facilities that include towers, terminal radar approach control facilities (TRACONs), and air route traffic control centers (ARTCCs). Air traffic controllers use alarms, alerts, and warnings (collectively, signals) as an aid to situation awareness ...
  • Aircraft Wake Vortices An Annotated Bibliography 1921 2020
    Aircraft Wake Vortices: An Annotated Bibliography (1921 - 2020)
    Soares, Melanie A. ;
    Robins, Robert E.
    2025-05-01 | PDF
    This is an updated version of the "Hallock, J. N., Aircraft Wake Vortices: An Annotated Bibliography (1923 - 1990), DOT-FAA-RD-90-30 / DOT-VNTSC-FAA-90-7, 1991” and other related historical bibliographies. This annotated bibliography consists of abstracts of publications on aircraft wake vortices and related fields. This material was developed as p ...
  • Measurement of Spray Chamber Ignition Delay and Cetane Numbers for Aviation Turbine Fuels
    Measurement of Spray Chamber Ignition Delay and Cetane Numbers for Aviation Turbine Fuels
    Luecke, Jon ;
    Naser, Nimal
    2025-05-01 | PDF
    Experiments using pure compounds, National Jet Fuels Combustion Program (NJFCP) test fuels, and commercial jet fuels were conducted to demonstrate the equivalence of the indicated cetane number (ICN) and derived cetane number (DCN) for jet fuels. The calibrated range for ICN was also extended to lower cetane number (CN) values (5 to 35) to allow CN ...
  • Spray and Soot Characteristics of Liquid Spray Flames in a HighPressure Sector Combustor
    Spray and Soot Characteristics of Liquid Spray Flames in a High-Pressure Sector Combustor
    Vishwanath, Rahul ;
    Olimid, Dominic
    2025-03-01 | PDF
    Conventional aviation combustors use liquid fuels where spray atomization is important for efficient combustion process and resultant emissions. In this study, a three-sector combustor with commercial pre-filming air blast injectors is utilized to analyze the effect of operating conditions on spray and soot formation. Measurements are performed wit ...
  • Freezing Point of Hydrocarbon Fuels from Single Species Concentrations
    Freezing Point of Hydrocarbon Fuels from Single Species Concentrations
    Bell, David C ;
    Boehm, Randall C.
    2025-02-24 | PDF
    The freezing point is an important property for determining the operating range of liquid hydrocarbon fuels. Many thermodynamic properties, like density, viscosity, and vapor pressure, have simple blending rules that can accurately predict the properties of a complex mixture. Freezing point, however, does not behave this way and shows nonlinear and ...
  • Assessment of Global Land Cover Changes Using Satellite Data Intermittent and LongTerm Land Cover Changes From 2001 to 2020
    Assessment of Global Land Cover Changes Using Satellite Data: Intermittent and Long-Term Land Cover Changes From 2001 to 2020
    Chen, Shuo ;
    Zhuang, Qianlai
    2025-02-01 | PDF
    Global land cover has changed during the past decades, influencing biogeochemical cycles and the global climate system. This study aimed to improve understanding of global land cover dynamics to enable more effective future land management practices and conservation actions. This study quantified interannual changes in global land cover types from ...
  • Pilot Vision
    Pilot Vision
    United States. Department of Transportation. Federal Aviation Administration. Civil Aerospace Medical Institute
    2025-01-17 | Aeromedical Safety Brochures | PDF
    Aeromedical Safety Brochures are prepared for general aviation pilots, commercial pilots and physicians. The brochures acquaint the aviation community with the physiological challenges of the aviation environment and relevant safety concerns.
  • Air Travel Consumer Report December 2024
    Air Travel Consumer Report: December 2024
    United States. Department of Transportation. Office of Aviation Consumer Protection
    2024-12-01 | Air Travel Consumer Report Series | PDF
    The Air Travel Consumer Report is a monthly product of the Department of Transportation’s Office of Aviation Consumer Protection (OACP). The report is designed to assist consumers with information on the quality of services provided by the airlines. The report is divided into sections (Flight Delays, Mishandled Baggage Wheelchairs and Scooters, Ove ...
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