Browsing Journal of Aerospace Engineering by Title
Now showing items 1685-1704 of 2238
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Quantification of Uncertainty in Structural Dynamic Models
(American Society of Civil Engineers, 2001)Structural dynamic models are used to simulate the performance of structures in a dynamic environment. The predictive accuracy of a model has been defined as the accuracy of predicted structural response under conditions ... -
Quantitative Modeling and Decoupling Method for Assembly Deformation Analysis Considering Residual Stress from Manufacturing Process
(American Society of Civil Engineers, 2015)Nonuniform residual stress inevitably exists in thick asymmetric component because of fabrication history originating from raw material processing. Bulk residual stress distribution of component has an impact on large-scale ... -
Quantum Notions of Stress
(American Society of Civil Engineers, 2007)Existing notions of stress in a quantum mechanical framework are reviewed and discussed in a semitutorial manner suitable for a mechanics audience. Notwithstanding early fundamental work in this area since the 1930s, the ... -
Quasi-One-Dimensional Numerical Method for Solid Fuel Scramjet Combustor Analysis and Design
(American Society of Civil Engineers, 2015)To research the performance of a solid fuel scramjet combustor, a solid fuel regression rate model was coupled into a quasi-one-dimensional flow equation, and so the flow parameters and fuel regression rate could be ... -
Quasi-Static Indentation Behavior of Honeycomb Sandwich Materials and Its Application in Impact Simulations
(American Society of Civil Engineers, 2008)Both the crushing and indentation behaviors of sandwich materials are important aspects in failure analysis and energy absorption. In this paper, the core crushing strength of honeycomb materials from the experiment is ... -
Quasi-Three-Dimensional Crack Tip Element Analysis for Evaluation of Total Energy Release Rate in Composite Laminates
(American Society of Civil Engineers, 2016)An analytical quasi-three-dimensional crack tip element model is developed to provide a quick assessment of the delamination behavior for composite laminates. A closed-form solution for the average total strain energy ... -
Quaternion-Based LQR Spacecraft Control Design Is a Robust Pole Assignment Design
(American Society of Civil Engineers, 2014)Recently, a fully controllable quaternion spacecraft model was proposed. Based on this controllable quaternion model, an analytic linear-quadratic regulator (LQR) design for a spacecraft control system was obtained. Although ... -
Radiative Maxwell Fluid Flow with Variable Thermal Conductivity due to a Stretching Surface in a Porous Medium
(American Society of Civil Engineers, 2014)This research examines the thermal radiation effects on the steady flow of Maxwell fluid over a nonisothermal stretched surface. An incompressible fluid fills the semi-infinite porous medium. The thermal conductivity is ... -
Railgun Space Launcher1
(American Society of Civil Engineers, 2010)A method and facilities for delivering payload and people into outer space are presented. This method uses, in general, engines located on a planetary surface. The installation consists of a space apparatus, power drive ... -
RANS Simulation Validation of a Small Sensor Turret for UAVs
(American Society of Civil Engineers, 2019)Recent Unmanned Aerial Vehicle (UAV) design procedures rely on full aircraft steady-state Reynolds-Averaged-Navier-Stokes (RANS) analyses in early design stages. Small sensor turrets are included in such simulations, even ... -
Rapid Path Planning for Zero Propellant Maneuvers Based on Flatness
(American Society of Civil Engineers, 2017)A rapid path planning (RPP) method that fast generates suboptimal zero propellant maneuver (ZPM) paths was proposed previously, and to further enhance the planning performance, the differential flatness of the model is ... -
Rapid Path Planning for Zero-Propellant Maneuvers
(American Society of Civil Engineers, 2016)The zero-propellant maneuver (ZPM) is an advanced space station large-angle attitude maneuver technique using control momentum gyroscopes (CMGs), and rapid path planning (RPP) enhances its performance. This paper proposes ... -
Rapid Path Planning for Zero-Propellant Maneuvers
(American Society of Civil Engineers, 2016)The zero-propellant maneuver (ZPM) is an advanced space station large-angle attitude maneuver technique using control momentum gyroscopes (CMGs), and rapid path planning (RPP) enhances its performance. This paper proposes ... -
Rate-Dependent Fracture Behavior of Aerospace Epoxies: PR-520 and 3502
(ASCE, 2021-09-16)To understand the response of polymeric materials used in fiber-reinforced composite structures, it is necessary to examine their brittle failure mechanisms under various loading scenarios. As such, this study presents the ... -
Rate-Dependent Shell Element Composite Material Model Implementation in LS-DYNA
(American Society of Civil Engineers, 2008)A previously developed constitutive model has been modified in order to incorporate the rate dependence of elastic modulus of the polymer matrix constituent into the nonlinear, strain-rate-dependent deformation analysis ... -
Real-Time and Highly Accurate Solar Spectrum Velocimetry Using the Mirror NDFT-CS for Doppler Navigation
(ASCE, 11/1/2021)Solar Doppler velocimetry navigation, which utilizes the Doppler frequency shift between the standard solar and measured solar spectra to invert the velocity of the spacecraft, is an emerging and promising celestial ... -
Real-Time Autonomous Obstacle Avoidance for Fixed-Wing UAVs Using a Dynamic Model
(ASCE, 2020)This paper presents an approach for real-time autonomous obstacle avoidance for fixed-wing unmanned aerial vehicles (UAVs) for scenarios in which a UAV is required to stay close to a reference path. A key challenge is rapid ... -
Real-Time Data-Driven Inverse Heat Conduction Method for a Reentry Flight Vehicle Based on the Random Forest Algorithm
(ASCE, 2024/01/01)The real-time monitoring of heat fluxes on the surface of a flight vehicle is vital for safe reentry and efficient attitude control. However, conducting measurements during flight is a challenge. In this study, a real-time ... -
Real-Time Drilling Strategy for Planetary Sampling: Method and Validation
(American Society of Civil Engineers, 2016)Drilling and coring, due to their efficient penetrating and cutting removal characteristics, have been widely applied to planetary sampling and returning missions. In most autonomous planetary drilling, there are not enough ... -
Real-Time Monitoring of Early-Age Concrete Strength Using Piezoceramic-Based Smart Aggregates
(American Society of Civil Engineers, 2019)It is well known that concrete is the most common type of structural material, and a proper estimation of concrete strength in its early age can provide guidance for staged concrete construction and ensure the load-bearing ...