Identifying the complexity of air traffic is an important task in air traffic management. Most current algorithms are usually tested using some macro-indexes, such as aircraft density, aircraft clusters, stranded degree, and so on. In this paper, the air traffic situation is described from the persp...

In a titled orbital milling process, the cutting tool is set as tilted against the axis of the hole with a small angle, which makes the revolving motion of cutting tool in conventional helical milling process be changed to a conical pendulum motion. It reduces the axial drilling forces and improves ...

Aimed at the problem that it is impossible to install high-precision sub-Inertial Measurement Unit (IMU) on every sub-array in engineering practice, a global estimation method based on the least square fitting for distributed Position and Orientation System (POS) is proposed. Firstly, a transfer ali...

The generation of lift and thrust mainly depends on the formation of low-pressure vortices above the arc groove on the leading edge of the fan-wing, which makes the lift and thrust have a strong coupling relationship. How to decouple and control the lift and thrust is the key to the further engineer...

For the aerospace engineering application of Distant Retrograde Orbit (DRO), a calculation method and orbit characteristics are studied, and the main perturbation factors of DRO in actual force environment are analyzed to provide a theoretical foundation for DRO's precise modeling and nominal orbit ...

In order to investigate the forming limit of TA15 titanium alloy at high temperature and clarify the influence of parameters in the constitutive equation on the forming limit, the constitutive relationship of TA15 titanium alloy in high temperature environment was established considering the high te...

This paper investigates a Multi-Objective Immune Optimization Algorithm (MOIOA) based on danger theory to solve the problem of nonlinear Multi-Objective Probabilistic Constrained Programming (MOPCP) with unknown noise information. In the design of the algorithm, adaptive sampling methods are used to...

Radio interferometers can achieve high spatial resolution imaging by combining multiple groups of visibility data measured over long periods of time. However, the variable information of temporally variable source is missing. A image reconstruction algorithm of varied sources by sparse baseline aper...

The use of light scattering signals to achieve the simultaneous inversion of the fractal morphology and particle size distribution parameters of soot aggregates have important application value in flame radiation heat transfer simulation and pollution control. The direct model of inversion is based ...

By the employment of quartz compensation chamber and high-speed camera, the visualization experimental study on the compensation chamber of a propylene loop heat pipe was implemented, which mainly focused on the variation of state of working fluid in the compensation chamber with the effect of the w...

In this paper, a helicopter trim calculation method based on the CFD/CSD loose coupling strategy is proposed. The CSD solver and rotor CFD solver use the blade elastic axis and pitch axis as media to exchange aerodynamic load and response data through linear interpolation method. In the coupling str...

Light field imaging technology is an emerging non-contact temperature measurement technology. Aiming at the important role of light field imaging reconstruction algorithm for flame temperature field measurement, the flame temperature field reconstruction algorithm based on light field imaging was st...

In target tracking task for multi-agent formation, the agent will lose the target when it is blocked by obstacles in the environment and external disturbances can affect the time-varying formation tracking control for multi-agent systems. This paper studies the time-varying formation tracking and co...

The logistics drone airport in the city needs the ability to take off and land multiple UAVs at the same time. An airport model with single inlet and single exit, route crossing and multiple aprons is designed for small and medium sized vertical takeoff and landing UAVs, and a flow control method ba...

Single-frequency RTK technology is widely used in high-accuracy mapping, unmanned driving and other fields. A single-frequency RTK dynamic accuracy detection method is proposed to accurately quantify the dynamic positioning accuracy. It is easy to operate, suitable for a wide area and does not need ...

Craters are the most significant topographic features on the surface of celestial bodies. The traditional method of craters identification is mainly to study the dichotomy of positive and negative samples of small craters, with low efficiency and accuracy. This paper takes large craters under the ma...

To solve the attitude tracking problem of transport aircraft with sensor faults and actuator faults, a backstepping fault-tolerant control method based on extended state observer is proposed. The state observer and controller are designed separately. The extended state observer with neural network i...

The variation rule determination of oxygen concentration in the free space of fuel tank is the basis of the design of inerting system.However, there are many factors that influence the oxygen concentration in the free space of fuel tank. At present, people still lack the necessary analysis and calcu...

Digital measurement technology has been gradually applied in aircraft large-scale component measurement, which also brings about many issues, and the fundamental one is how to plan the number and layout of measurement points to well describe the curve or surface. Aimed at solving the issue of compli...

To solve the problem of oxygen mole fraction changing with time in the upper space of oil tank of oxygen consuming inerting system. A mathematical model was established for the reaction process of the Green On-Board Inert Gas Generation System (GOBIGGS), and the inerting process of the GOBIGGS and t...

The traditional image stitching detection algorithm manually constructs the stitching features by researchers. With the advancement of technology and the continuous development of image processing technology, the limitations of the features of manual construction, such as weak robustness and difficu...