In order to study the drop capturing capabilities of heterogeneous walls, a numerical method is developed by integrating the generalized Navier boundary condition into front tracking method (FTM) to establish the contact angle model. The numerical simulation of the movement of drops on the heterogen...

The plume ejected from a working ion thruster collides with the surface of spacecraft, which may cause thermal effects such as thermal deformation of the sensitive material and lead to the failure of the space mission in severe cases. In this paper, the plume thermal effect of LIPS-200 ion thruster ...

In order to research the influence of flow stress calculation on formability of aluminum alloy warm sheet hydroforming, warm sheet bulging test was carried out to obtain bulging height-pressure curves with different bulging diameters in this study. Based on the data of bulging parts profile measured...

The torque ripple of switched reluctance motor (SRM) can be reduced to some extent by traditional direct torque control (DTC), but the torque ripple suppression effect is poor in the commutation zone. And the traditional PI control has disadvantages of large overshoot, poor robustness and limited an...

The aim of this paper was to study the lubrication characteristics of sliding bearings for aeroengine fuel gear pumps under low medium viscosity and self-cooling conditions. Based on the Reynolds equation for hydrodynamic lubrication of oil film and equivalent viscosity lubrication flow model, the e...

The self-adaptability and robustness of traditional PID control and current fuzzy-PID control adopted by universal motion and automation controller (UMAC) were not strong, and the static-dynamic performance of servosystem controlled by them was not ideal. In this paper, RBF neural network was adopte...

Aimed at the problem that rough set (RS) theory cannot deal with information system without decision when evaluation issues are processed, an air target threat evaluation model based on information entropy (IE) and RS is put forward. The model adopts IE method to calculate the attribute weights, cho...

Surface tactile representation technology can display characteristics of the displayed contents through our bare fingers, realizing efficient and natural interaction on multimedia terminal screens. However, most studies in this field focus on the force tactile interaction device, and do not systemat...

The process of taking off from the surface of water for cormorant is a combination of flapping its wings and its webbed-feet periodically. In order to look into the contribution of the latter that helps in taking off and to compute each period in fixed quantity of the amount of force in each flappin...

Due to the complexity and randomness of the turbofan blade icing shedding characteristics, it is difficult to use computational simulation to obtain reliable results. On the other hand, icing wind tunnel test can hardly be always applied due to its high cost. In this paper, a feasible, economical an...

Reduction is one of the most commonly used collective communication operations for parallel applications. There are two problems for the existing reduction algorithms:First, they cannot adapt to complex environment. When interferences appear in computing environment, the efficiency of reduction degr...

A carrier aircraft moves on a carrier flight deck which has the characteristics of heavy workloads and multiple obstacles. In order to reduce energy consumption of the carrier aircraft and improve service life of the aircraft engine, the carrier aircraft is usually dragged by a tractor on the flight...

In order to achieve the high maneuverability of the air-to-air missile, the flow characteristics of vortices over the blunt-slender body at different angles of attack were studied by wind tunnel forces and pressure test in this paper. The Reynolds number is set as Re_D=1.54×10⁵, based on oncoming fre...

Aimed at the deorbit problem of reentry vehicles with constraints of reentry point location, a deorbit planning method using ground track manipulation is proposed in this paper. The deorbit trajectory design of reentry vehicles is constrained by the parameters of the real-time orbit and the aimed re...

In order to analyze soft landing performance of typical legged lander with variable damping buffer, the dynamic simulation model of lander was established. Based on the simulation model, the soft landing performance of the lander in the uncertain landing environment was analyzed by using Monte Carlo...

Using aerodynamic parameters to model the unknown aerodynamics is an effective way to improve the tracking accuracy of hypersonic gliding vehicles. The aerodynamic acceleration and its derivative is analyzed to prove the necessity of unknown aerodynamics modeling in this paper. Based on the non-coup...

In order to perform large angle attitude maneuvers of spacecraft outside the atmosphere, we propose a fuel-optimal large angle attitude maneuver strategy using modified linear pseudo-spectral model predictive control method. First, a fuel-optimal attitude maneuver trajectory satisfying initial and t...

Three commonly used variable amplitude multiaxial fatigue life analysis methods, including Bannantine-Socie method, Wang-Brown method and Wang L-Wang D J method are reviewed briefly based on the current researches on variable amplitude multiaxial fatigue. Then, the algorithms of the three methods we...

An multi-model Gamma Gaussian inverse Wishart-generalized labeled multi-Bernoulli (MM-GGIW-GLMB) algorithm is proposed for multiple maneuvering group target tracking. A multi-model approach is introduced for kinematic modeling, and best fitting Gauss (BFG) approximation is used to fuse the multiple ...

In outdoor radar cross section (RCS) measurement, background clutter cannot be suppressed effectively using conventional background subtraction technique due to the fact that, influenced by time-variant outdoor environment, the amplitudes and phases of radar received returns collected at different t...

On the stability control of the rope system, a stability control method of tether swing for tethered system consisting of tether and tethered satellites during deorbitting is proposed in this paper. In this paper, a model of motion including satellite attitude motion is eatablished, and the dynamic ...

Dynamic environment map construction technology based on 3D laser scanning system has been served as one of the important intelligent perception technologies for mobile robots. The design and calibration of 3D laser scanning system place a decisive influence on the accuracy of the constructed enviro...

Wiretap channel is a widely-used model to describe physical layer security and polar code shows potential in wiretap channel model due to its polarization characteristic. A new inter-block encryption security scheme without the need of acquiring signal-to-noise ratio (SNR) is designed for the polar ...

In order to explore the melting process of phase change materials in the phase change energy storage unit with fins in microgravity environment, the heat transfer and flow characteristics of phase change materials in microgravity environment are investigated by numerical simulation. The accuracy of ...

Zero-Doppler clutter (ZDC) caused by the surrounding environment of an outdoor measurement field is one of the major factors which degrade the accuracy of the target scattering signatures in wideband radar cross section measurement. A new technique for ZDC estimation based on maximal probability is ...

In order to ameliorate the accuracy and efficiency of aero-engine working condition identification, and to avoid the misjudgment and time-consuming problems in manual identification of aero-engine working condition, an intelligent recognition method, multi-kernel support vector data description base...