Browsing Journal of Aerospace Engineering by Title
Now showing items 1569-1588 of 2238
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Parallel Algorithms for Integrated Structural/Control Optimization
(American Society of Civil Engineers, 1994)Optimization of combined structural and control systems is a complex problem requiring an inordinate amount of computer‐processing time, especially the solution of the eigenvalue problem of a general unsymmetric square ... -
Parallel Eigenvalue Algorithms for Large-Scale Control-Optimization Problems
(American Society of Civil Engineers, 1996)In a recent article, the authors presented the formulation and outline of parallel algorithms for the integrated structural/control optimization problem. The solutions of the Riccati equation, open-loop system of equations, ... -
Parallel Feedforward and Simple Adaptive Control of Flexible Structures: First-Order Pole Instead of Collocated Velocity Sensors?
(American Society of Civil Engineers, 2016)Stable control of large flexible structures has long been a challenge. Even though other research showed that direct velocity control and then position-and-velocity control are feasible, they require perfect or almost ... -
Parallel Feedforward and Simple Adaptive Control of Flexible Structures: First-Order Pole Instead of Collocated Velocity Sensors?
(American Society of Civil Engineers, 2016)Stable control of large flexible structures has long been a challenge. Even though other research showed that direct velocity control and then position-and-velocity control are feasible, they require perfect or almost ... -
Parallel Multigrid Detached Eddy Simulation Algorithm for Three-Dimensional Unsteady Incompressible Flows on Unstructured Meshes
(American Society of Civil Engineers, 2006)A cell vertex finite volume algorithm and an artificial compressibility approach are employed to enable simulation of three-dimensional incompressible unsteady turbulent flow using unstructured tetrahedral meshes. Unsteady ... -
Parallel-Vector Algorithms for Analysis of Large Structures
(American Society of Civil Engineers, 1995)In analysis of large space structures, the major computational steps are evaluation and assembly of the structure stiffness matrix and solution of the resulting simultaneous linear equations. In this paper we present ... -
Parameter Estimation from Flight Data of Hansa-3 Aircraft Using Quasi-Steady Stall Modeling
(American Society of Civil Engineers, 2013)Nonlinear longitudinal aerodynamics of planar fins and aircraft at high angles of attack near stall have been modeled using Kirchhoff’s formulation. Both the steady-stall and quasi-steady stall models have been applied on ... -
Parameter Estimation of Unmanned Flight Vehicle Using Wind Tunnel Testing and Real Flight Data
(American Society of Civil Engineers, 2017)The work presented in this paper addresses the longitudinal parameter estimation of an unmanned configuration using wind tunnel testing and flight data. For this purpose, an unmanned aerial vehicle has been designed with ... -
Parameter Identification–Based Attitude Stabilization Control of Spacecraft with Multiaccessories during Orbital Maneuver
(American Society of Civil Engineers, 2017) -
Parameter-Influencing Analysis of Aeroengine Operation Reliability
(ASCE, 5/12/2023 )The reliability during aeroengine operation is significant in monitoring its time-varying operational status and providing valuable reference for both operation and design. To study aeroengine time-series operational ... -
Parametric Analysis of a Large-Scale Cycloidal Rotor in Hovering Conditions
(American Society of Civil Engineers, 2017) -
Parametric Effect of Blade Surface Blowing on the Reduction of Rotor Blade–Vortex Interaction Noise
(ASCE, 2021-09-23)Reducing rotor blade–vortex interaction (BVI) noise is a major challenge in rotorcraft research. This paper presents a high-resolution numerical study of the effects of blade surface blowing on BVI noise reduction. Using ... -
Parametric Investigation of the Flight Performance of a Variable Rotor Pitch X-Configuration Quadrotor Aircraft
(ASCE, 2022/11/01)To better understand and predict the flight performance of X-configuration quadrotor aircraft using variable rotor pitch and fixed rotor speed to control the aircraft, a flight performance tool including a rotor model, an ... -
Parametric Numerical Simulation of Flow Field in Scaled U-Shaped Ground Test Cell
(ASCE, 2024/03/01)The high-quality flow field of an aeroengine ground test cell is the basis for accurate and reliable engine testing and obtaining relevant performance data. In this study for a U-shaped ground test cell, first, the similarity ... -
Parametric Study of Pounding Tuned Mass Damper Based on Experiment of Vibration Control of a Traffic Signal Structure
(American Society of Civil Engineers, 2018)In the last few years, a new type of passive damper, the pounding tuned mass damper (PTMD), has been proposed and studied for passive structural vibration control. Experiments and numerical simulations verify the effectiveness ... -
Parametric Study of Truncated Square Pyramid Folded Structure for Effective Energy Absorption under Static and Dynamic Crushing
(ASCE, 2022/11/01)The truncated square pyramid (TSP) folded structure was proposed recently, and its advantages such as easy fabrication, superior energy-absorption capacity, and better impact performance than many other types of core ... -
Parametric Study on Influence of an Array of Air Jets on the Performance of Supersonic Air Intake by Varying the Jet Injection and Back Pressure
(ASCE, 11/1/2021)A numerical study on the performance parameters of supersonic mixed compression air intake has been carried out at a design Mach number of 2.2 with and without air jets at various back-pressure ratios using a commercially ... -
Parametric Study on Seismic Control Design of a New Type of SMA Damper Installed in a Frame-Type Bridge Pier
(American Society of Civil Engineers, 2018)This paper focuses on the seismic control design of a new type of shape memory alloy (SMA) damper named double X-typed SMA (DX-SMA) damper. It is installed in a frame-typed bridge pier. A parametric study based on time-history ... -
Parametric Study on Thrust Vectoring with a Secondary Injection in a Convergent–Divergent Nozzle
(ASCE, 2020)This work investigated the performance of thrust vectoring with a secondary injection in a convergent–divergent nozzle. Analytical modeling was conducted to determine the shock location and shock angle, providing a guideline ... -
Particle Swarm Optimization of Aerodynamic Shapes with Nonuniform Shape Parameter–Based Radial Basis Function
(American Society of Civil Engineers, 2017)Efficient global optimization of aerodynamic shapes with the high-fidelity method is of great importance in the design process of modern aircrafts. In this study, modifications are made to the particle swarm optimization ...