Water surface skipping is a kind of motion in which the bottom of the aircraft touches the water surface and bounces up repeatedly when it moves near the water surface. This motion can improve the unpowered range and maneuverability of the long-range projectile near the water surface. This paper use...

The existing semantic segmentation methods of 3D point clouds based on deep learning usually ignore the profound semantic information between neighboring points when extracting local features and fail to consider the useful information in other neighboring features when aggregating local neighboring...

In view of the phenomenon of piston transverse crack in crushing hammer, the paper analyzes the transverse crack of piston, and puts forward a new heat treatment process of piston. The piston material was analyzed by using a hardness tester and a metallographic microscope. It is found that the mater...

The traditional similarity matching method is liable to introduce pseudo-similar engines, which leads to low prediction accuracy. To address this issue, a remaining useful life (RUL) prediction method of improved similarity with interval partition was proposed, which combined the engine performance ...

Composite materials are increasingly used in modern commercial aircraft skin. However, the poor conductivity makes it necessary to have additional conductive structures to ensure the current flow in the skin. In order to improve the conductivity of the skin and reduce the influence of the bonding be...

The current infrared and visible video fusion model cannot dynamically adjust the fusion strategy according to the difference between videos, resulting in poor fusion effect or even failure. To address this issue,an adaptive layered fusion algorithm for infrared and visible video based on possibilit...

In order to solve the problems of the remote location of frontier sentries, complex environment, large energy demand, and high cost of access to the electricity network, the complementary nature of wind/photovoltaic resources, as well as the high energy density and green and clean characteristics of...

To address the issues of information transfer and data sharing in the full-life-cycle building information modeling (BIM) application of the airport runway system, the industry foundation classes (IFC) standard was extended to the airport pavement structure. The IFC entity framework of the airport r...

Survey based on the fatigue risk management system has been conducted at an unprecedented speed in the global aviation industry. During the quarantine exemption period, data such as subjective ratings, objective tests, and sleeping information were collected from 64 pilots of international flights e...

Dual frequency ionosphere-free observations are usually applied to evaluate the satellite based augmentation system (SBAS) user differential range error (UDRE) integrity with the drawback of noise amplification. Instead, a range domain integrity method is proposed to assess the combined effect of SB...

In some extreme conditions, heat flux with high density is non-uniformly distributed on the surface. To address this issue, this paper analyzed the influence of non-uniform heat flux on the flow and heat transfer characteristics of supercritical carbon dioxide by employing numerical calculation and ...

This paper studies the lifetime of software security vulnerabilities under the DevSecOps framework aiming at the conceptual confusion problem of research on software errors and software security vulnerabilities. This work provides a definition of software security vulnerability pattern together with...

Human pose estimation is an important aspect in the field of behavioral perception and a key technology in the way of intelligent interaction in the cockpit of civil aircraft. To establish an explainable link between the complex lighting environment in the cockpit of civil aircraft and the performan...

The complex interaction flow between the helicopter rotor and ground induced the movement of sand particles in the sand bed and then yielded helicopter brownout. However, a crosswind will change the rotor-ground interaction flow field, and influence the brownout. Therefore, a crosswind is coupled in...

There is no direct evaluation method for the H₂O penetration depth of the drying reactor in the CO₂ removal system in the space station. Therefore, an indirect evaluation method based on the temperature gradient characteristics of the temperature sensor inside the drying reactor was proposed. Since ...

Power system management now includes monitoring power equipment operation, which is crucial given the growing size of power facilities. Defect prediction of power equipment is a key step in power system operation monitoring. In order to solve the problem of defect prediction for power equipment in l...

The coupling of multiple vibration sources of planetary gearboxes results in difficulty in identifying fault sources, and weak fault features are easily masked by noise and strong fault features. In addition, signal attenuation caused by the propagation path causes weak fault features. To address th...

Aiming at the problem of gliding-guided projectile penetration schemes in inevitable threat areas, mathematical models of the enemy’s defense are established from the perspective of quantifying the threat value. Based on the model, a cost function with the lowest comprehensive threat value in the wh...

Vehicle gravimetry is carried out along the surface of the earth. Its slow speed and flexible maneuverability can provide favorable conditions for high-precision ground gravimetry. Due to its heavy dependence on the global positioning system (GPS), traditional gravimetry on a moving pedestal cannot ...

The variable-camber trailing edge is frequently used in new concept aircraft design because of its advantages of continuous deformation, less resistance, and low aerodynamic noise. A rigid-elastic coupling dynamics modeling method based on the variable-camber trailing edge was proposed, and rolling ...

Point-contact conjugate involute worm drive can reduce the sensitivity of the worm gear pair to manufacturing and assembly errors and ensure transmission accuracy. On the basis of differential geometry and gear meshing theory, this paper constructed a mathematical model of point-contact conjugate in...

This paper studies the problem that the current radar radiation source threat assessment algorithm relies heavily on accurate reconnaissance data. Firstly, a radiation source threat assessment system based on behavior characteristics is constructed, starting from the radiation source target behavior...

To improve the control performance, the digital-analog hybrid control with the extended state observer (ESO) and sliding mode control (SMC) is proposed for the galvanometer laser scanner in this paper. The digital-analog hybrid control scheme is first proposed, which adopts the digital controller an...

Air target grouping is a popular topic for research in the area of combat scenario assessment and can be thought of as essentially an uncountable class clustering issue. Aiming at the unknown air battlefield environment, a MDk-DPC algorithm based on manifold distance and k-nearest neighbor sampling ...

Global navigation satellite system (GNSS) is easy to be deceived and jammed in a complex electromagnetic environment, while the low earth orbit (LEO) integrated communication and navigation satellite system has the advantages of high landing power and rapid constellation geometry changes, and it is ...

Morphing aircraft can significantly enhance the aerodynamic performance of the aircraft, and variable camber flexible trailing edge is one of the important ways to achieve this. To investigate the dynamic response characteristics and alleviation efficiency of the wing under the dynamic deflection of...

In order to explore the mechanism of the effect of inlet corner wave system on the wall pressure distribution of scramjet nozzle and investigate the influence of the inlet corner wave system on the performance of a scramjet nozzle, the numerical simulation and analysis of the influence of different ...

A smart contract is a software service on blockchain with the characteristics of value transfer, contractuality, and trustworthiness. The quantity of smart contracts on blockchain systems is currently rising, together with the application scope's expansion and the restrictions of conventional smart ...

In order to improve the temperature uniformity of the phase change material domain and the heat transfer rate of the finned tube energy storage system, two types of fractal structures and their corresponding fin volume fraction were used as design parameters, and lauric acid was used as the phase ch...

In recent years, blockchain technology has been developing rapidly, and It plays a critical role in fintech, supply chain, medical health, data security and other fields. Due to friendly supervision and excellent performance, the consortium chain has become China's first choice for government and co...