Through simulation experiments and machine learning, this paper studies the main factors that affect the temperature in aircraft fuel systems and predicts the temperature of the fuel system. The basic structure and layout of aircraft fuel system were determined. A simulation model was established us...

Aimed at the problem that the random working load of complex mechanical systems cannot be clearly given, a life prediction method based on hidden semi-Markov model (HSMM) is proposed. After completing the construction of the load space based on the HSMM, the forward and backward transition parameter...

In previous studies, the general method for flight recovery problem used fixed flight transit time, rather than considered the result of flight transit time changes in real airports. We propose a LightGBM model to predict accurate transit time based on the airport-flight features from total 235 airp...

In consideration of the problem that the lateral deviation of the underactuated intelligent ships increases due to the influence of path curvature and environmental disturbance during the path tracking task, the guidance law of intelligent ships is discussed. An adaptive guidance law with finite-tim...

For the gliding flight phase guidance problem of lifting vehicle, a drag and lift acceleration commands rapid calculation and tracking guidance method is proposed. Drag acceleration command is calculated directly by one-dimensional particle kinematics and weighting. By introducing the "virtual targe...

The experimental platform for measuring the gas-liquid mass diffusion coefficient is set up based on the method of digital holographic interferometry. The hollow stainless steel constant temperature diffusion tank is designed and processed and the digital image processing is coded by self-programmin...

The modeling and simulation of spaceborne GNSS reflectometry is important for the research of forward and inverse problem of GNSS reflectometry, and the evaluation of algorithm and performance in the receiver. This paper firstly develops the layered structure of modeling spaceborne GNSS reflectometr...

Mass-actuated UAVs have the advantages of higher aerodynamic efficiency, better stealth performance and simpler wing structure. This paper proposes a single-slider mass-actuated UAV layout scheme with smaller time delay and simpler structure, and analyzes the influence of the slider parameters on th...

In order to research the competence of the copper foam/low-melting-point alloy (LMPA) composite material to recover to the initial state in the intermittent exothermic working environment and the influence of the addition of copper foam with different porosity on the solidification exothermic proces...

Linear frequency modulation (LFM) signal is a commonly used transmission signal of modern radar, which can effectively improve the detection performance of radar. However, when smeared spectrum (SMSP) jamming is applied to the main lobe self-defense, the intensity of the jamming signal is much highe...

Aimed at the cooperative search problem of UAV swarm without prior information, a cooperative search algorithm of UAV swarm is proposed, which is guided by coverage rate and constrained by safe distance, communication distance, yaw angle adjustment and search boundary. The task area is described by ...

Aimed at the uncertainty of the aerodynamic load distribution of strap-on launch vehicles due to the uncertainty of flight status and shape parameters, a method based on the polynomial chaos theory to analyze the aerodynamic load distribution characteristics and quantify the uncertainty of the strap...

To understand the complicated blowoff process of premixed turbulence methane-air flame after a conical bluff body, the numerical simulation method based on large eddy simulation (LES) and transport equation probability density function (TPDF) turbulence combustion model was adopted to simulate the f...

The aerodynamic performance of steady jet is poor at high angle of attack. With the help of pulsed jet, the aerodynamic performance at high angle of attack can be effectively improved and the mass flow rate of jet can be reduced. The unsteady numerical simulation method is used to calculate the aero...

A general singularity avoidance algorithm is proposed to solve the kinematic singularity problem of pedestal-controllable space manipulator in Cartesian path planning. First, we establish Jacobian matrix of the space manipulator by the method of virtual mechanical arm, and determine singular area by...

In the welding seam phased array ultrasonic testing (PAUT), the traditional manual judgment method is used to identify and locate the defects in the inspection data. However, this method has lower interpretation efficiency and higher requirements for the experience of the inspectors, and it has diff...

During the chip manufacturing process of integrated circuits, attackers can use blank areas in the circuit layout to implant hardware Trojans. For this reason, this paper proposes a method to prevent inserting hardware Trojans by filling the layout with A2-RO circuit. The goal of protection is reduc...

Current image registration algorithms relying on the internal parameters of sensing devices for image alignment face the difficulty of acquiring precise device parameters and reaching high mapping precision; while the ones using matched image features to calculate image homography matric for registr...

Aimed at the inaccuracy of channel estimation of orthogonal frequency division multiplexing (OFDM) system in the complex air-ground data link environment, this paper proposes a channel estimation algorithm based on the modulated convolutional neural network (MCNN) and bidirectional long short-term m...

Hollow fiber membrane module used for airborne inerting has the advantages of high separation efficiency, security, stability and compact structure. It is a relatively economic and efficient equipment of aircraft fuel tank inerting. The computational fluid dynamics (CFD) method is used to simulation...