Focusing on the fuel control law of the small size turbofan engine DGEN380, a steady and transient component-level mathematical model was developed and simulated on MATLAB platform with analytic method. A special tool was used for modeling the rotating parts in order to get the components characteri...

We study the restricted occurrence times for variables and literatures in 3-SAT problem. In particular, we propose a strictly regular random (3, s)-SAT problem and its instances generating model-SRR model. Using the first moment method and the asymptotic approximation technique to the expansion coef...

Receiver autonomous integrity monitoring (RAIM) is an inseparable part of aviation satellite navigation receiver. Failures or faults due to malfunctions in the global navigation satellite system (GNSS) should be detected and isolated to keep the integrity of the GNSS intact. Because measurement nois...

In order to meet the requirement of space payload system and data transmission, the data business type was divided into periodic business, burst business and strong timeliness business. After the characteristics of the three kinds of business are analyzed, a scheme of dynamic bandwidth allocation (D...

Aerodynamic configuration design and optimization are vital to overall design of aircraft. Higher requirements of lift-drag ratio and control performance are put forward for near space vehicles. The lifting-body shape of the wing-body combination has become the main design direction of the hypersoni...

For the hovering true hoverfly, stroke deviation angle is relatively small. It is higher at the beginning and end of a downstroke or upstroke, and lower at the middle of the downstroke or upstroke, which leads to a shallow U-shaped wing-tip trajectory. In order to investigate the effect of wing-tip ...

Missile electromagnetic relay (EMR) is one of the key electromechanical components used for signal transmission, load switching and circuit protection in defense weapon system. How to reliably evaluate the storage reliability of missile EMR has become the most important problem that is urgent to be ...

Star sensor used for deep space stars exploration is a faint signal detector. Star sensor is sensitive to slender stray light, and therefore, the stray light suppressing ability is a key influencing factor of the exploration ability. Through the point source transmittance (PST), the suppression indi...

Planar folding satellite antenna deployment mechanism is widely used in the field of astronautics. It has a large and complicated topology structure, which is composed by joint-connecting rods. The existence of joint clearances makes the analysis of the antenna deployment a tough task and contribute...

Electrical large targets are difficult to be accurately and analytically expressed and thus it is difficult to use uniform geometrical theory of diffraction (UTD) method for field computation. Aimed at this problem, a novel creeping ray triangular mesh tracing (TM-tracing) algorithm for arbitrary co...

The development of hypersonic vehicle is a process of multi-product and small-batch production. In order to reduce the cost of experiments and decrease the period of the modeling of hypersonic vehicles, model migration method is used to calculate the aerodynamic parameters of the vehicles with simil...

Hysteresis nonlinear relationship between input and output exists in giant magnetostrictive actuator (GMA). In order to lower hysteresis nonlinearity of material, minor hysteresis loops are often applied when the high frequency characteristics are studied. Therefore, it is very important to research...

In order to study internal flow pattern, the 3D flow in inducer with helical static blades is numerically computed by using the computational fluid dynamics (CFD). The suction and cavitation performance of the inducer are analyzed. The results show that the head increases with helical static blades,...

A kind of defect with some of the cell walls missing in a honeycomb structure causes the loss of continuum of the honeycomb, and thus results in the stress concentration around the defect tip. Combined with the finite element and the analytic methods, this paper analyzed the normal stresses distribu...

In this paper, the static ground effect of delta wings with different sweep angles is investigated by numerical simulation. The analyses of aerodynamic force and flow field characteristics show that in ground effect, the "block effect" of ground enhances the windward surface pressure; with the sweep...

Vaneless contra-rotating turbine is one of the key technologies of the high performance engine. Experimental research was conducted to investigate aerodynamic performance of 1+3/2 contra-rotating turbine. The experiment was tested over three phases:first the alone high pressure turbine (HPT) experim...

With the rapid growth of cloud computing and big data, in addition to the urgent demand for city development, smart city construction has become one of the hot topics of domestic and international computer science researches. With the increasing number of closed-circuit televisions and sensor device...

The asymmetric vortices can be determined through setting the artificial perturbation on the nose of the blunt body at high angle of attack. To study the influence of perturbation geometry on the asymmetric vortices, numerical simulation was applied and the hemispherical, D-type and square perturbat...

This paper proposes a single control strategy to solve the problem of difficult transmedia vehicle control. The proposed control strategy is just to control the vehicle's air navigation, but not to control the underwater navigation. The hydrodynamic model of a vehicle obliquely water-entry at low sp...

The study of rapid measurement and calibration for phased array antenna has always been one of hot issues. The low efficiency of traditional calibration method cannot satisfy the requirement of large-scale engineering application of phased array antenna. A fast calibration method called four-phase-c...

To meet the technical requirements of missile radome frequency selective surface (FSS), a partition and projection system of radome surface was proposed and developed. Based on the study of approximate partition and projection of complex surface, the partition coefficient was defined as the ratio of...

Aimed at time resource allocation in the air defense phased array radar in overload situations, a new scheduling algorithm using the threat density of targets and deadline of tasks to decide the task dynamic priority was proposed. The nonlinear threat level of targets model was established and the d...

Aimed at the problems of inefficiency, heavy work and unstable quality in corner numerical control (NC) programing for aircraft structural parts, a new auto-extended method based on rounded corner face was put forward. Combined with process knowledge, the processing model of corner is set up, which ...

Revolute pin joint (revolute pair) possesses one degree of freedom, i.e. rotation movement, through relative sliding between contact pairs. Existence of friction and clearance in revolute joints has crucial effects on the overall precision of mechanism. Using the concept of critical angle, the margi...

Because planning unmanned aerial vehicle (UAV) path directly in 3D space is difficult, we divide 3D path planning into 2D plane path planning and height planning, and then combine them to get the 3D path so that planning space is simplified and complexity is reduced. To search the path subtly in the...

With advantages such as fast imaging frame rate, high resolutions and penetration through dust and smoke, video synthetic aperture radar (ViSAR) has a broad application prospect. But for ViSAR that works in terahertz carrier frequency, helicopter platform's tiny high frequency vibration will cause o...

In this paper, we developed a parametric modeling framework for composite bionic suture joint structures through MATLAB and ABAQUS secondary development based on Python language. It shows the capability in describing the complicated suture joint geometry with different types of hierarchy and automat...