An Autonomous Navigation Algorithm for High Orbit Satellite Using Star Sensor...
An autonomous navigation algorithm using the sensor that integrated the star sensor (FOV1) and ultraviolet earth sensor (FOV2) is presented. The star images are sampled by FOV1, and the ultraviolet...
View ArticleA Comparison of Averaged and Full Models to Study the Third-Body Perturbation
The effects of a third-body travelling in a circular orbit around a main body on a massless satellite that is orbiting the same main body are studied under two averaged models, single and double, where...
View ArticleThe Inhomogeneous Waves in a Rotating Piezoelectric Body
This paper presents the analysis and numerical results of rotation, propagation angle, and attenuation angle upon the waves propagating in the piezoelectric body. Via considering the centripetal and...
View ArticleMagnetohydrodynamic Simulations of Hypersonic Flow over a Cylinder Using...
Numerical simulations of magnetohydrodynamic (MHD) hypersonic flow over a cylinder are presented for axial- and transverse-oriented dipoles with different strengths. ANSYS CFX is used to carry out...
View ArticleUnstart Coupling Mechanism Analysis of Multiple-Modules Hypersonic Inlet
The combination of multiplemodules in parallel manner is an important way to achieve the much higher thrust of scramjet engine. For the multiple-modules scramjet engine, when inlet unstarted...
View ArticleDamage Accumulation in Cyclically-Loaded Glass-Ceramic Matrix Composites...
Barium osumilite (BMAS) ceramic matrix composites reinforced with SiC-Tyranno fibers are tested in a cyclic loading protocol. Broadband acoustic emission (AE) sensors are used for monitoring the...
View ArticleNumerical Laser Energy Deposition on Supersonic Cavity Flow and Sensor...
In this study, the impact of laser energy deposition on pressure oscillations and relative sound pressure levels (SPL) in an open supersonic cavity flow is investigated. Laser energy with a magnitude...
View ArticleAerodynamic Analysis of Cup Anemometers Performance: The Stationary Harmonic...
The effect of cup anemometer shape parameters, such as the cups’ shape, their size, and their center rotation radius, was experimentally analyzed. This analysis was based on both the calibration...
View ArticleDetecting and Mitigating Wind Turbine Clutter for Airspace Radar Systems
It is well recognized that a wind turbine has a large radar cross-section (RCS) and, due to the movement of the blades, the wind turbine will generate a Doppler frequency shift. This scattering...
View ArticleDynamics of Space Particles and Spacecrafts Passing by the Atmosphere of the...
The present research studies the motion of a particle or a spacecraft that comes from an orbit around the Sun, which can be elliptic or hyperbolic, and that makes a passage close enough to the Earth...
View ArticleEfficiency of Hysteresis Rods in Small Spacecraft Attitude Stabilization
A semiempirical method for predicting the damping efficiency of hysteresis rods on-board small satellites is presented. It is based on the evaluation of dissipating energy variation of different...
View ArticleGust Mitigation of Micro Air Vehicles Using Passive Articulated Wings
Birds and insects naturally use passive flexing of their wings to augment their stability in uncertain aerodynamic environments. In a similar manner, micro air vehicle designers have been investigating...
View ArticleIn-Flight Alignment Using Filter for Strapdown INS on Aircraft
In-flight alignment is an effective way to improve the accuracy and speed of initial alignment for strapdown inertial navigation system (INS). During the aircraft flight, strapdown INS alignment was...
View ArticleExperimental Investigation of the Flow on a Simple Frigate Shape (SFS)
Helicopters operations on board ships require special procedures introducing additional limitations known as ship helicopter operational limitations (SHOLs) which are a priority for all navies. This...
View ArticleReentry Trajectory Optimization Based on a Multistage Pseudospectral Method
Of the many direct numerical methods, the pseudospectral method serves as an effective tool to solve the reentry trajectory optimization for hypersonic vehicles. However, the traditional pseudospectral...
View ArticleIgnition and Flame Stabilization of a Strut-Jet RBCC Combustor with Small...
A Rocket Based Combined Cycle combustor model is tested at a ground direct connected rig to investigate the flame holding characteristics with a small rocket exhaust using liquid kerosene. The total...
View ArticleA Cascaded Approach for Correcting Ionospheric Contamination with Large...
Ionospheric phase perturbation with large amplitude causes broadening sea clutter’s Bragg peaks to overlap each other; the performance of traditional decontamination methods about filtering Bragg peak...
View ArticleDynamic Calibration and Validation of an Accelerometer Force Balance for...
An accelerometer-based force balance was designed and developed for the measurement of drag, lift, and rolling moment on a blunt-nosed, flapped delta wing in a short-duration hypersonic shock tunnel....
View ArticleEffect of Turbulence Intensity on Cross-Injection Film Cooling at a Stepped...
This study is concerned with a film cooling technique applicable to the protection of the endwalls of a gas turbine vane. In the experiments, cross-injection coolant flow from two-row, paired, inclined...
View ArticleDSMC Simulation and Experimental Validation of Shock Interaction in...
Direct simulation Monte Carlo (DSMC) of shock interaction in hypersonic low density flow is developed. Three collision molecular models, including hard sphere (HS), variable hard sphere (VHS), and...
View ArticleFuel Cells: A Real Option for Unmanned Aerial Vehicles Propulsion
The possibility of implementing fuel cell technology in Unmanned Aerial Vehicle (UAV) propulsion systems is considered. Potential advantages of the Proton Exchange Membrane or Polymer Electrolyte...
View ArticleA Comprehensive Robust Adaptive Controller for Gust Load Alleviation
The objective of this paper is the implementation and validation of an adaptive controller for aircraft gust load alleviation. The contribution of this paper is the design of a robust controller that...
View ArticleAerodynamic Characteristics of the Ventilated Design for Flapping Wing Micro...
Inspired by superior flight performance of natural flight masters like birds and insects and based on the ventilating flaps that can be opened and closed by the changing air pressure around the wing, a...
View ArticleExperimental Investigation of a Wing-in-Ground Effect Craft
The aerodynamic characteristics of the wing-in-ground effect (WIG) craft model that has a noble configuration of a compound wing was experimentally investigated and Universiti Teknologi Malaysia (UTM)...
View ArticleNeural Network Assisted Inverse Dynamic Guidance for Terminally Constrained...
This paper presents a neural network assisted entry guidance law that is designed by applying Bézier approximation. It is shown that a fully constrained approximation of a reference trajectory can be...
View ArticleResponse of a Hypersonic Boundary Layer to Freestream Pulse Acoustic Disturbance
The response of hypersonic boundary layer over a blunt wedge to freestream pulse acoustic disturbance was investigated. The stability characteristics of boundary layer for freestream pulse wave and...
View ArticleModelling and Simulation of Fuel Cell Dynamics for Electrical Energy Usage of...
Dynamics of proton exchange membrane fuel cells (PEMFC) with hydrogen storage system for generating part of Hercules airplanes electrical energy is presented. Feasibility of using fuel cell (FC) for...
View ArticleExploration of a Capability-Focused Aerospace System of Systems Architecture...
In defense related programs, the use of capability-based analysis, design, and acquisition has been significant. In order to confront one of the most challenging features of a huge design space in...
View ArticleRobust Stabilization Control Based on Guardian Maps Theory for a Longitudinal...
A typical model of hypersonic vehicle has the complicated dynamics such as the unstable states, the nonminimum phases, and the strong coupling input-output relations. As a result, designing a robust...
View ArticleUnsteady Boundary-Layer Flow over Jerked Plate Moving in a Free Stream of...
This study aims to investigate the unsteady boundary-layer flow of a viscoelastic non-Newtonian fluid over a flat surface. The plate is suddenly jerked to move with uniform velocity in a uniform stream...
View ArticleNumerical Investigation of Galloping Instabilities in Z-Shaped Profiles
Aeroelastic effects are relatively common in the design of modern civil constructions such as office blocks, airport terminal buildings, and factories. Typical flexible structures exposed to the action...
View ArticleParticle Filtering for Obstacle Tracking in UAS Sense and Avoid Applications
Obstacle detection and tracking is a key function for UAS sense and avoid applications. In fact, obstacles in the flight path must be detected and tracked in an accurate and timely manner in order to...
View ArticleMathematical Analysis of the Effect of Rotor Geometry on Cup Anemometer Response
The calibration coefficients of two commercial anemometers equipped with different rotors were studied. The rotor cups had the same conical shape, while the size and distance to the rotation axis...
View ArticleAccuracy Improvement Capability of Advanced Projectile Based on Course...
Improvement in terminal accuracy is an important objective for future artillery projectiles. Generally it is often associated with range extension. Various concepts and modifications are proposed to...
View ArticleA Sequential Optimization Sampling Method for Metamodels with Radial Basis...
Metamodels have been widely used in engineering design to facilitate analysis and optimization of complex systems that involve computationally expensive simulation programs. The accuracy of metamodels...
View ArticleModeling and Optimization of Multiple Unmanned Aerial Vehicles System...
Unmanned aerial vehicle (UAV) systems have already been used in civilian activities, although very limitedly. Confronted different types of tasks, multi UAVs usually need to be coordinated. This can be...
View ArticleInvestigations on the Influence of the In-Stream Pylon and Strut on the...
The influence of the in-stream pylon and strut on the performance of scramjet combustor was experimentally and numerically investigated. The experiments were conducted with a direct-connect supersonic...
View ArticleCoordinated Control of Slip Ratio for Wheeled Mobile Robots Climbing Loose...
A challenging problem faced by wheeled mobile robots (WMRs) such as planetary rovers traversing loose sloped terrain is the inevitable longitudinal slip suffered by the wheels, which often leads to...
View ArticleOptimization of Deflection of a Big NEO through Impact with a Small One
Using a small near-Earth object (NEO) to impact a larger and potentially threatening NEO has been suggested as an effective method to avert a collision with Earth. This paper develops a procedure for...
View ArticleLinear Dispersion Relation and Depth Sensitivity to Swell Parameters:...
Long gravity waves or swell dominating the sea surface is known to be very useful to estimate seabed morphology in coastal areas. The paper reviews the main phenomena related to swell waves propagation...
View ArticleMRAC Control with Prior Model Knowledge for Asymmetric Damaged Aircraft
This paper develops a novel state-tracking multivariable model reference adaptive control (MRAC) technique utilizing prior knowledge of plant models to recover control performance of an asymmetric...
View ArticleA Robust Controller for an UAV Flight Control System
The objective of this paper is the implementation and validation of a robust controller for an UAV to track all types of manoeuvres in the presence of noisy environment. A robust inner-outer loop...
View ArticleA Novel Biobjective Risk-Based Model for Stochastic Air Traffic Network Flow...
Network-wide air traffic flow management (ATFM) is an effective way to alleviate demand-capacity imbalances globally and thereafter reduce airspace congestion and flight delays. The conventional ATFM...
View ArticleAn Airway Network Flow Assignment Approach Based on an Efficient...
Considering reducing the airspace congestion and the flight delay simultaneously, this paper formulates the airway network flow assignment (ANFA) problem as a multiobjective optimization model and...
View ArticleHelicopter Control Energy Reduction Using Moving Horizontal Tail
Helicopter moving horizontal tail (i.e., MHT) strategy is applied in order to save helicopter flight control system (i.e., FCS) energy. For this intention complex, physics-based, control-oriented...
View ArticleTerminal-Area Aircraft Intent Inference Approach Based on Online Trajectory...
Terminal-area aircraft intent inference (T-AII) is a prerequisite to detect and avoid potential aircraft conflict in the terminal airspace. T-AII challenges the state-of-the-art AII approaches due to...
View ArticleDynamic and Structural Performances of a New Sailcraft Concept for...
Typical square solar-sail design is characterised by a central hub with four-quadrant sails, conferring to the spacecraft the classical X-configuration. One of the critical aspects related to this...
View ArticleSpace-to-Ground Communication for Columbus: A Quantitative Analysis
The astronauts on board the International Space Station (ISS) are only the most visible part of a much larger team engaged around the clock in the performance of science and technical activities in...
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