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Showing papers in "Chinese Journal of Aeronautics in 2008"


Journal ArticleDOI
TL;DR: In this article, a nonlinear model of an underactuated six degrees of freedom (6 DOF) quadrotor helicopter is derived on the basis of the Newton-Euler formalism.

216 citations


Journal ArticleDOI
Zhao Shiyu1, Zhou Rui1
TL;DR: In this article, a cooperative guidance scheme for multiple missiles is proposed, where coordination algorithms and local guidance laws are combined together, which may provide a general solution to the multimissile cooperative guidance problems.

153 citations


Journal ArticleDOI
TL;DR: In this paper, at-matrix composites with high volume fraction (55%-57%) of SiC particles are produced with the new pressureless infiltration fabrication technology, which is shown to possess low density (2.94 g/cm(3), high elastic modulus (220 GPa), prominent thermal management function as a result of low coefficient of thermal expansion (8x10(-6) K(-1)) and high thermal conductivity (235 W/(m.K)) as well as unique preventability of resonance vibration.

125 citations


Journal ArticleDOI
TL;DR: In this paper, an integrated guidance and control model in the pitch plane is formulated and further changed into a normal form by nonlinear coordinate transformation, by adopting the sliding mode control approach, an adaptive nonlinear control law of the system is designed so that the missile can hit the target accurately with a desired impact attitude angle.

98 citations


Journal ArticleDOI
TL;DR: In this paper, a proportional integral derivative (PID) controller is designed and attached to EHSAS to control the angular position of the rotary actuator which control the movable surface of space vehicles.

77 citations


Journal ArticleDOI
TL;DR: In this article, the instantaneous chip thickness is modeled to include the dynamic modulation caused by the tool vibration while the dynamic regenerative effects are taken into account, and the numerical method is used to solve the differential equations governing the dynamics of the milling system.

66 citations


Journal ArticleDOI
TL;DR: In this paper, three types of time-varying sliding mode controls are introduced under consideration of control input constraints, and the controller parameters are optimized by means of genetic algorithm to minimize the index consisting of the weighted index of squared error (ISE) of the system and the weighted penalty term of violation of the control input constraint.

64 citations


Journal ArticleDOI
TL;DR: In this article, the nonlinear bearing forces of a roller bearing under four-dimensional loads and established 4-DOF dynamics equations of a rotor roller bearing system were presented. But the results showed that the system is liable to undergo instability caused by the quasi-periodic bifurcation, the periodic-doubling bifuralcation and chaos routes as the rotational speed increases.

62 citations


Journal ArticleDOI
TL;DR: In this article, the dynamic trajectory tracking problem of the spherical robot BHQ-2 designed for unmanned environment exploration is investigated, where a trajectory tracking controller is designed by using the back-stepping method.

59 citations


Journal ArticleDOI
TL;DR: A systematic approach to design compliant structures to carry out required shape changes under distributed pressure loads using MATLAB and ANSYS to optimize the distributed compliant mechanisms by way of the ground approach and genetic algorithm to remove the elements possessive of very low stresses.

40 citations


Journal ArticleDOI
TL;DR: Numerical results indicate that the application of hybridization-encouraged mechanism could effectively improve the performances of genetic algorithm.

Journal ArticleDOI
TL;DR: In this paper, a new approach to design pinion machine tool-settings for spiral bevel gears by controlling contact path and transmission errors is proposed, which is based on the satisfaction of contact condition of three given control points on the tooth surface.

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the compression responses of different fabrics under dry or wet conditions, and the main factors affecting the compression response under in-vestigation include, the vacuum pressure, the loading and unloading repeatability on the preform, the layup design, the kinds of fabrics, and resin viscosity Besides, some internal factors such as nesting and elastic recovery of fibers, lubrication of resin, friction between fibers, and so on, are also studied.

Journal ArticleDOI
TL;DR: In this article, the microstructure and mechanical properties of the as-sintered products of Al2O3 particle-reinforced TiAl composites are investigated.

Journal ArticleDOI
TL;DR: In this paper, a robust airfoil optimization is proposed to minimize mean values and variances of drag coef-ficients while satisfying the lift and thickness constraints over a range of Mach numbers.

Journal ArticleDOI
TL;DR: In this paper, a three-blade computational model is set up for the fan rotor blade having shrouds, and the transient response curves of the points corresponding to measured points in experiments, displacements and equivalent stresses on the blades are obtained during the simulation.

Journal ArticleDOI
TL;DR: In this article, the influence of uncertainties in structural parameters on the flutter speed of a wing is studied and the authors propose a non-probabilistic interval reliability analysis of wing flutter.

Journal ArticleDOI
TL;DR: In this paper, a method to design and optimize 3D FINOCYL grain (FCG) configuration for solid rocket motors (SRMs) is presented, where a series of computations are carried out to formulate the grain geometry in terms of various combinations of key shapes including ellipsoid, cone, cylinder, sphere, torus and inclined plane.

Journal ArticleDOI
TL;DR: In this article, the reasons of the static strength dispersion and the fatigue life dispersion of composite laminates are analyzed and a correlation relation between the two distributions is established.

Journal ArticleDOI
TL;DR: In this article, the authors presented the data about heat transfer coefficient ratios, film cooling effectiveness and heat loads for the injection through cylindrical holes, 3-in-1 holes and fanned holes in order to characterize the film cooling performance downstream of a row of holes with 45° inclination and 3 hole spacing apart.

Journal ArticleDOI
TL;DR: In this paper, a nonlinear high-speed solenoid valve model is developed with the consideration of magnetic saturation characteristics and verified by test, according to the design rule of keeping the peak load as small as possible while absorbing the specified shock energy.

Journal ArticleDOI
TL;DR: In this paper, a Stewart platform based hybrid isolator with 6 hybrid struts is used for active/passive vibration isolation over 5-250 Hz band, and a dynamics model is derived, and the rigid mode is removed to keep the signal of pointing control.

Journal ArticleDOI
TL;DR: In this article, the model similarity law of aircraft structures under bird impact load is investigated with dimensional analysis and similarity theory, and numerical calculations by means of nonlinear dynamic software ANSYS/LS-DYNA are conducted on the finite element models constructed with different scaling factors.

Journal ArticleDOI
TL;DR: In this paper, the authors proposed a precise and ecofriendly micromachining technology for aerospace application called electrochemical machining in pure water (PW-ECM), which is based on the principles of water dissociation, a series of test setups and tests are devised and performed under different conditions.

Journal ArticleDOI
TL;DR: In this article, a double-wedge lifting surface with combining freeplay and cubic structural nonlinearities in both plunging and pitching degrees-of-freedom operating in both supersonic/hypersonic flight speed regimes has been analyzed.

Journal ArticleDOI
TL;DR: In this article, a nonlinear variable structure guidance law is presented by using Lyapunov stability theory, which positions the interceptor ahead of the target on its flight trajectory, and the speed of interceptor is required to be lower than that of target.

Journal ArticleDOI
TL;DR: In this paper, the technical and economical viability of photochemical machining, photo electroforming and laser beam machining (LBM) was evaluated to help engineers choose the fittest approach to turn out aerospace filters.

Journal ArticleDOI
TL;DR: In this article, an approximation algorithm for machining integral ruled surface impellers is proposed by fitting sampling data points of an impeller blade into a curve, a model of the impeller's blade is built up, and an integral impeller cutting path is planned by way of an integrated cutter location control algorithm.

Journal ArticleDOI
TL;DR: In this paper, a vector orthogonal polynomial (VOP) estimator is proposed to solve the numerical problem of multivariable systems and applied to the flutter testing.

Journal ArticleDOI
TL;DR: In this paper, two Al2O3/Cu composites containing 024 wt% Al 2O3 and 060 wt%, respectively, were prepared by internal oxidation, and the effects of sliding speed and pressure on the frictional characteristics of the composites and copper against brass were investigated.