In order to solve the problem of complex flow between annulus of coaxial rotating conical cylinders, the flow characteristics of fluid between annular spaces were studied experimentally. Experimental studies were carried out for the complex flow characteristics of fluid between annulus of coaxial ro...

Aiming at the problem of the probe's lunar landing, the control strategy of lunar orbit descent is studied. According to the control equations of the lunar orbit descent, the three kinds of relationship between the different combinations of the single-pulse control variables of the lunar orbit desce...

In order to solve the problem of searching for optimized launch period lasting 2-3 weeks for an engineering-oriented Earth-to-Mars transfer trajectory, with constraints from the launch azimuth scope and the longest coast time on parking orbit of the cryogenic final stage, adding coast constraint int...

In the geomagnetic data assimilation, we analyze the weight determination weakness of the direct average method, reverse distance weighting average method and latitude difference weighting average method which are widely used in the previous work. Considering the geomagnetic field strength has a clo...

For the problem of multi-node InSAR wing deflection deformation error, a method based on mechanism modeling integrated parameter identification is proposed for the layered modeling of wing deflection deformation induced by air disturbance. First, this model takes atmospheric turbulence as the main a...

For the non-cable requirement in space rendezvous and docking, spacecraft power distribution, and on-orbit service and maintenance, the multi-channel near-field wireless energy transmission system is proposed. The multi-channel magnetic coupling near-field wireless energy transmission mathematical m...

It is important to study the direct injection spray penetration and spray cone angle characteristics of gasoline for the occurrence and development of spray and combustion characteristics in gasoline direct injection engine. Based on the design and building of gasoline direct injection (GDI) system,...

According to complex and changeable high-temperature environments of large rotating machinery, such as aero engines or steam turbines, the main rotor system of the unit has a variable structure due to thermal expansion under operating conditions, which could also affect the operation characteristics...

In order to quantitatively examine the dynamic characteristics in pitching direction of the tans-atmospheric orbiter under different flight conditions, on the basis of the Etkin aerodynamic model, the effects of Mach number, reduced frequency, oscillation amplitude, and average angle of attack on lo...

For a kind of domestic T700-grade carbon fiber and four types of bismaleimide resin (QY9611, 5429, QY9512, QY8911-4) used in aeronautic field, three hydrothermal conditions, including 100℃ boiling water, 70℃ water immersion and 70℃/85% relative humidity, were adopted to treat these unidirectional co...

Aimed at the problems of large amount of calculation and low iteration efficiency of response surface method which is widely used in structural reliability calculation, an improved response surface method based on hybrid weighting of sample points and variable-direction search of reliability index i...

For the current testability verification field, the relationship between the fault sample size determination and the sample allocation is not taken into consideration, and the existing sample allocation schemes have no uniform framework for the selection of the impact factor, which lead to the probl...

For this question of low clustering accuracy problem in LiDAR full-waveform echo data with different targets at the same distance, a threshold-based K-means clustering algorithm was proposed based on the analysis of K-means clustering algorithm. Firstly, The distance information was calibrated using...

Considering that the existing extensive research on frequency diverse array (FDA) is mainly working on the assumption that single-carrier frequency signals are transmitted under narrow-band conditions. And there is a lack of relevant research on the issue whether linear frequency modulation signals ...

To solve the problem that continuously operating reference stations' receiver's outliers in China will interfere with ionospheric anomaly event extraction of satellite-based augmentation system (SBAS), an outlier detection method based on the ionospheric vertical delay time gradient is proposed. Fir...

The simulation of global navigation satellite system (GNSS) signal reflected from the ocean surface mostly uses wind-driven wave spectrum, which ignores the effect of swell and rain in real complex environment. For this reason, a model of GNSS signal reflected from the ocean surface under the effect...

Magnetically suspended control and sense gyroscope (MSCSG) is a new type of gyroscope which combines attitude control and attitude measurement functions and uses Lorentz force magnetic bearings (LFMBs) to drive the rotor to tilt. To solve the problem of coupling between two measuring axes of MSCSG, ...

Aimed at the proportional guidance missile, the state space model of high-order guidance system was established, and the optimal maneuver penetration strategy and influencing factors were studied based on power series solution of miss distance. First, when the missile guidance system was linear firs...

As the processing capacity of system-on-chip (SoC) is getting close to the traditional integrated core processing module, the avionics system is developing towards the miniature, integrated off-chip system. Time-triggered switched interconnection can guarantee the strictly time deterministic propert...

Aimed at the problem that traditional telemetry data correlation analysis methods can only discover relevant degree knowledge and cannot provide relevant structural information, an extreme gradient boosting (XGBoost) and neural network ensemble learning method is proposed to discover the cross-corre...

Deep learning technology has developed rapidly in the field of super-resolution reconstruction. In order to further improve the quality and visual effect of reconstructed images, this paper proposes a super-resolution reconstruction based on wavelet transform and generative adversarial networks (GAN...

Boost converter is often used as the pre-stage circuit in double-stage inverter. Because of the existence of parasitic parameters in the circuit, the output voltage will be superimposed with transient spikes, which reduces the waveform quality and even affects the operation of inverter. In order to ...

The automatic drilling for the docking of large parts of aircraft adopts the skin-side pressed drilling technology, and the instantaneous springback of the lamination material in the common automatic drilling system has serious influence on the drilling equipment and hole quality. The optimization a...

In this paper, a two-dimensional fast Fourier transform(FFT) signal processing algorithm based on relative distance evaluation function optimization is proposed for the joint estimation of target range and velocity information of millimeter-wave frequency modulated fuze. The relationship between the...

To solve the problems of poor chip removal effects like the chip adhesion and rod jamming of core drill tool that would have a significantly negative influence on machining efficiency and machining quality during common core drilling (CCD) process of carbon fiber reinforced plastics (CFRP) using a c...