Showing papers in "Chinese Journal of Aeronautics in 2010"

TL;DR: In this paper, the effects of process parameters (i.e., wheel speed, workpiece speed and depth of cut) on the grindability and surface integrity of cast nickel-based superalloys, i.e. K424, during creep feed grinding with brazed cubic boron nitride (CBN) abrasive wheels are investigated.

TL;DR: In this paper, a new virtual leader scheme is used for design of guidance laws with time constraints, and a novel time-constrained guidance (TCG) law, which can control the flight time of missiles to a prescribed time, is designed by using the virtual leader schemes and stability method.

TL;DR: In this paper, a high speed switched reluctance machine (SRM) is designed to operate as a starter/generator, and the entire design process is mainly divided into two stages: electromagnetic design and thermal design.

TL;DR: In this article, an adaptive nonlinear optimal compensation control strategy based on two estimated nonlinear parameters, viz. the flow gain coefficient of servo valve and total factors of flow-pressure coefficient, is proposed to optimize torque tracking performance.

TL;DR: In this article, the authors investigated the rotating propagation of a continuous detonation engine (CDE) with different types of nozzles using a one-step chemical reaction model, and the propulsion performance of a CDE was computed for four types of Nozzles, namely the constant-area nozzle, Laval nozzle, diverging nozzle and converging nozzle.

TL;DR: In this paper, a systematic geometric model has been presented for calibration of a newly designed 5-axis turbine blade grinding machine, which is designed to serve a specific purpose to attain high accuracy and high efficiency grinding of turbine blades by eliminating the hand grinding process.

TL;DR: In this paper, a hybrid process incorporating laser drilling with jet electrochemical machining (JECM-LD) was developed to solve recast layers and spatters, commonly accompanied by laser-drilled holes always prevent the laser drilling technique from extending its applications in aerospace and aircraft industries.

TL;DR: In this paper, an approach that combines the finite element method (FEM) and the response surface method (RSM) to optimize the preform shapes was proposed to improve the deformation homogeneity in aerospace forgings.

TL;DR: Simulation results prove the feasibility and usefulness of using FVF for UAV path planning and demonstrate that the proposed approach is fast enough to meet the real-time requirements of the online path planning problems.

TL;DR: In this paper, the authors present an overview of rolling element bearing designs and technologies and outline the complex interrelation of all fundamentals with the rolling contact fatigue and the attainable bearing life.

TL;DR: In this paper, the rotational and vibrational temperatures of an asymmetric surface dielectric barrier discharge plasma aerodynamic actuation are measured in terms of the optical emission spectra from the N2 second positive system.

TL;DR: In this article, an electrochemical micromachining (EMM) technology for fabricating micro structures is presented, and sets of experiments are carried out to investigate the influence of some of the predominant electrochemical process parameters such as electrical parameters, feed rate, electrode geometry features and electrolyte composition on machining quality, especially the influences of pulse on time on shape precision and working end shape of electrode on machined surface quality.

TL;DR: In this paper, a burner testbed is built in order to study the characteristic of combustion instability in afterburners of aeroengine and rocket engine, and an analytical model based on transfer element method is developed and the numerical results are compared with those from experiments.

TL;DR: In this article, the advantages, usages, shortages and disadvantages of 3D braided composites are analyzed, and the possible approach of improving the properties of the materials is presented.

TL;DR: In this article, an eigenaxis maneuver strategy with global robustness is studied for large angle attitude maneuver of rigid spacecraft, which guarantees the sliding mode occurrence at the beginning and eliminates the reaching phase of time-invariant sliding mode control.

TL;DR: In this article, the authors considered the body, the nacelles and the rotors to be independent entities, and established a realistic model in the form of multi-body motion equations.

TL;DR: In this article, the authors investigated the low-temperature formation of aluminide coatings on a Ni-base superalloy by pack cementation process and found that all the parameters exclusive of the pack activator (NH 4 Cl) content produce effect on the coating thickness, but do not on the microstructure and the constituent distribution.

TL;DR: In this article, a wire-driven parallel manipulator was used to obtain the aerodynamic parameters of an airplane model for low-speed wind tunnel tests, where the wire tension of wires was measured and the results of the measurements were analyzed.

TL;DR: In this paper, a stratified importance sampling method (SISM) is presented to analyze the reliability sensitivity for structure with multiple failure modes, where the variable space is divided into several disjoint subspace by n-dimensional coordinate planes at the mean point of the random vector, and the importance sampling functions in the subspaces are constructed by keeping the sampling center at the average point and augmenting the standard deviation by a factor of λ.

TL;DR: In this article, a methodology has been presented for designing three-dimensional (3D) grain configuration of radial slot for upper stage solid rocket motors (SRMS) for launch vehicles require a highly efficient propulsion system.

TL;DR: In this article, a dual drive curve tool path planning method is proposed to solve the problem of the finished surface being not first-order continuous commonly exists in machining sculptured surfaces with a torus cutter.

TL;DR: In this article, a 6-degree of freedom (6-DOF) aircraft wing position and pose automatic adjustment method is presented to improve ARJ21 wing-fuselage connection precision and efficiency.

TL;DR: In this article, numerical simulations are carried out on wing-in-ground effect (WIG) craft with PAR engine in cruise to provide detailed insight into the aerodynamic characteristics of WIG craft.

TL;DR: In this article, the SIMPLER method is used to solve the two-dimensional (2D) unsteady axisymmetric Navier-Stokes equations for both the drop and the ambient gas flow.

TL;DR: In this paper, the authors investigated the recrystallization behavior of single crystal superalloy DD6 alloy and showed that the equiaxed recrystization grains form in the γ phase region where the as-cast γ′ phases have been dissolved completely, and cellular recrestallization forms in the region where they have been partially dissolved.

TL;DR: In this article, an experimental study on the control of the oblique shock wave around the ramp in a low-temperature supersonic flow by means of the magnetohydrodynamic (MHD) flow control technique was conducted.

TL;DR: A two-stage iterative algorithm based on an inverse projection ray approach to address the relative position and attitude estimation by using feature points and monocular vision is proposed.

TL;DR: In this paper, the erosion process of polyimide materials in atomic oxygen (AO) environment has been examined by scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS) after exposure to incremental AO flux.

TL;DR: In this article, a multidisciplinary design and optimization (MDO) strategy for the conceptual design of a multistage ground-based interceptor (GBI) using hybrid optimization algorithm, which associates GA as a global optimizer with sequential quadratic programming (SQP) as a local optimizer.

TL;DR: The experimental results indicate that the new tool materials rapid selection method based on the initial wear is effective and useful and can be used to select suitable cutting tool materials quickly before carrying out systematic machinability tests with the most suitable tool materials.