System-of-systems (SoS) is always under the influence of both intra and extra disruptive events. SoS architecture is the foundation of SoS design and construction, whose resilience is not only an significant indicator to reflect the ability to recover from disruptions, but also an important embodime...

Rotating orifices and cavity are important parts of the air system of gas turbine engine, and their transient response might induce dangerous instantaneous transient load. To investigate the transient evolvement of the cavity with rotating orifices, a CFD model of the cavity with rotating orifices w...

In view of the problem that the digital phase ramp in fiber optic gyroscope resets frequently at the small angular velocity measurement, the reset phase error is modeled under the condition of the gain drift of the modulation chain. Then the mechanism and condition are analyzed for the frequent rese...

When robot grasps an object, the pose of the object maybe change frequently. In order to make the robot adapt to the change of the pose of the object in the process of motion, an adaptive grasping strategy of robot based on Gaussian process was proposed. The proposed method maps the observation vari...

Aimed at inaccuracy and difficulty to extend the traditional design pattern automatic detection method, and in order to improve the accuracy of the design pattern instance recovery, an interactive clue-driven approach for design pattern detection was presented. Concept of clue was introduced based o...

The environment of near space atmosphere is very complex. Its spatial and temporal changes are hard to be characterized and modeled. With 11 years of TIMED/SABER atmospheric density data, the climate means and standard deviations at 38°N in 20-100 km were obtained by the method of global gridding an...

In order to obtain the more accurate sputtering model of SiO₂ for bombardment with low energy Ar⁺ and Xe⁺, three existing models, Pencil model, Bach model and Seah model, were investigated and the deficiencies were analyzed. On the basis of Seah model, the sputtering parameters and surface binding e...

The spacecraft electrical signal characteristic data have problems such as large amount, high-dimensional features, high computational complexity and low identification rate. The feature extraction method of principal component analysis (PCA) and random forest (RF) algorithm was proposed to reduce t...

To study the performance of a 76 km high-altitude test system for attitude-control liquid rocket engines, a transient test system simulation model with lumped parameters was built, which considers the phase change of the exhaust. The system model consists of a vacuum pumping sub-model, a liquid nitr...

Deceptive jamming is a common radar jamming technology. This paper presents a novel deception jammer against monopulse radar. First, the characteristics of angle deceptive signal is analyzed. Then, according to energy aggregation properties of the linear frequency modulation (LFM) signal in fraction...

Grid synchronization is one of the key technologies to improve the fault ride-through capability for grid-connected converter. To achieve fast and accurate phase or frequency tracking under unbalanced grid voltage, a kind of improved first-order generalized integrator based on frequency-locked loop ...

The magnetic target tracking problem is addressed in this paper by establishing the discrete state-space model on the basis of the equivalent magnetic dipole model in order to formulate the real-time magnetic dipole target tracking problem as filtering estimation problem of state-space model. Then a...

A trajectory tracking method based on predictive control in the virtual domain is proposed for the algorithm of online real-time trajectory planning. The method uses polynomial approximate system model and introduces virtual path and inverse dynamics to convert time domain into virtual domain. Its a...

Oxidising paste was prepared for in-situ local oxidation treatment of coatings on aluminum alloy skin surface and its film-forming performance on 2024-T3 aluminum alloy was studied. Morphology and chemical composition, corrosion resistance, and adhesive performance of the oxidation film were investi...

The failure probability is usually hard to collect for complicated systems in aerospace or nuclear power, which makes fault diagnosis based on Bayesian model inapplicable. By surveying this problem in test space, a novel multi-fault fuzzy diagnosis method based on dependency matrix and grey theory w...

Object detection in remote sensing images is mostly suffered from complex background and multiple interferences of environment. In this paper, a new method of ship detection is proposed, which combines convolutional neural networks (CNN) and support vector machine (SVM) to complete the ship detectio...

Aimed at the influence of elastic deformation on the control characteristics of split rudder for the forward swept wing (FSW) aircraft, the computational fluid dynamics/computational structural dynamics (CFD/CSD) loose coupling static aeroelastic numerical calculation method was adopted. The calcula...

When the full-automatic quick hitch coupling device (full-AQHCD) of the rescue robot wrist automatically locks tightly the attachment interface, i.e., the lower coupling parts (LCP), it must synchronously dock precisely with and switch on the hydraulic pipelines of the LCP automatically, for this re...

Considering the autonomous route of free flight in low-altitude airspace, a probabilistic short-term conflict detection algorithm is proposed. The trajectory prediction error caused by navigation error, control error and wind disturbance was taken into account. A reasonable error model was construct...

In current ground-based augmentation system (GBAS), the average vertical protection level(VPL) increase caused by non-nominal troposphere error is 2.29 m, the accuracy of bounding is reduced and the integrity risk is increased. Faced with the above problems, a real-time method was proposed based on ...

Research on the control strategy, control structure and control law parameter design method is developed in this paper to realize flight control with high-precision performance in the longitude channel of UAV, aimed at solving the impact of sophisticated landing environment, including both the air-w...

Crack is a type of common defect in welding area of blade appearing in the process of blisk manufacture. Due to the complex structure of welding area in blade and the small size of crack defect, it is difficult to detect the welding crack. In order to satisfy the application requirement of this new ...

Ti-alloy honeycomb with variable skin thickness has been widely used in the aerospace field. Skin desoldering is one of the most common defects of Ti-alloy honeycomb sandwich. Because of single frequency, traditional lock-in thermography cannot defect desoldering under skin with a variety of thickne...

Usually a modern navigation satellite needs to combine multiple signal components at the same carrier frequency or even two/three adjacent frequencies into a constant-envelope signal before its high power amplifier. The phase-optimized constant-envelope transmission (POCET) technique can deal with a...

Environment control system (ECS) in a space station is an essential system for the astronaut life safety. Composed of a number of coupling subsystems, the ECS functions as the controller of the cabin air condition and the environmental parameters, which are essential parts to the astronauts' life sa...

Two measurement methods for carbon fiber's axial thermal conductivity are compared, which use fiber bundle and unidirectional fiber reinforced composite samples, respectively. The influence of fiber volume fraction and sample thickness on the measurement was discussed. The applicability of the metho...