Since aircraft tire hydroplaning can be influenced by several factors, and the characteristic of evaluation indexes can be described as fuzzy, random, and discrete, a hydroplaning risk evaluation model based on extension theory and connection cloud was established, so as to quantify the transformati...

An algorithm based on Mobile Vit and inverted gated codec is proposed for retinal vessel segmentation (FMVG-Net), aiming to tackle issues such background noise interference, boundary texture blurring, and challenging extraction of microvascular areas. First, we improve the Mobile Vit module, and rea...

Under high-speed driving conditions, over-area handover, as a key technology for future 5G-R communication of high-speed railways, is crucial for ensuring driving safety. The next-generation 5G-R wireless communication system of high-speed railways adopts fixed handover parameters, but when the trai...

A dual path supervision and attention filtering network was proposed to solve the problem of blurry boundary classification of target objects in semantic segmentation tasks of remote sensing images. A supervised boundary extraction module was introduced to increase the channel of boundary informatio...

Morphing aircraft is a new concept vehicle that changes its aerodynamic shape by a morphing mechanism to adapt to various flight environments and mission requirements, which has important application value in aerospace, military reconnoitre, and other fields and is the frontier and hot spot of futur...

Angular contact ball bearings will suffer from fault damage after working for a long time, thus affecting the normal operation of the system. In this paper, angular contact ball bearingswith local defects in the outer ring were taken as the research objects, and the discrimination methods of differe...

A dynamic visual simultaneous localization and mapping (SLAM) algorithm based on an object detection network is proposed to address the robustness and camera localization accuracy issues caused by dynamic targets in indoor dynamic scenes. The lightweight network PP-LCNet replaces the YOLOv5 backbone...

Cavity flow oscillation phenomenon would occur during the transiton of ramjet with the inlet entrance unobstructed while its exit blocked. As the flow oscillating dramatically, the flight vehicle would face a crisis of instability attitude controlling and structural failure. Due to the problem of fl...

To satisfy the requirements on accuracy and efficiency of point cloud registration of damaged compressor blades a algorithm for partition based on features of neighborhood points and the corresponding accurate point cloud registration of aero-engine damaged blades was proposed. First of all, based o...

The completion time of the cyclic operation of carrier aircraft usually presents significant uncertainty, which directly affects the development of subsequent mission plans for carrier aircraft by carrier mission planners. To determine the distribution pattern of the completion time of the cyclic op...

A ground risk assessment model for unmanned aerial vehicle (UAV) operation was developed in order to guarantee the safe operation of UAVs in low-altitude urban areas. It was proposed that a ground risk map that considered multi-factors and multi-levels be used to define the ground risk associated wi...

In this paper, a 9-component chemical non-equilibrium model and a perfect gas model were used to study the reentry flow of an inflatable reentry decelerator through numerical simulation. The differences in the calculation results of the two models were investigated. The manifestation of the real gas...

Tooling composites prepreg cured at low temperatures and used in high temperature is one of the most promising materials for forming composite tools to manufacture high-precision composite structures in the aerospace field. Tooling composites prepreg utilizes a specially designed two-step method tha...

With the development of deep learning techniques, learning implicit field for 3D shape reconstruction has become a heated topic, because implicit field can help networks learn a reasonable and sophisticated reconstruction model than explicit methods. However, there are still some challenges to be so...

To investigate the orientation effect of micro-texture on the sealing performance parameters of the floating ring gas film, a rectangular micro-textured hole was selected as the study object. A theoretical analysis model of textured hydrodynamic lubrication control was developed based on gas lubrica...

Graphene tag antenna, owing to its low price and environmental friendliness, is a promising alternative to metal tag antenna. However, graphene antennas inevitably suffer from property uncertainties due to the manufacturing process of screen printing and the properties of graphene inks, making their...

Unexpected breakdowns of ion thrusters affect their reliability in engineering applications. In order to reduce the frequency of unexpected electric breakdown between shell and screen grid of the thruster, the unexpected breakdown mechanism was clarified through theoretical analysis and experimental...

After analyzing the occurrence and the reason behind the power reflux in toyota hybrid system (THS) at high speeds, a novel hybrid electromechanical coupling system scheme that can address the power reflux issue is put forth. The system not only solves the power reflux problem, but also adds an engi...

This article presents a comparative experimental study on the flow and heat transfer performance differences between additive manufacturing (AM) rough channels and machined smooth channels for supercritical pressure n-decane. Using a roughness gauge, the surface average roughness of the smooth chann...

The structural integrity of the aero-engine is related to flight safety. Currently, the detection of aero-engine defects based on borescope technology is mainly manually operated. In order to improve detection accuracy and efficiency, an intelligent aero-engine defect detection algorithm by fusing a...

In view of the heat flow, overload, and dynamic pressure constraint problems during the reentry process of the lift reentry vehicle, a calculation method of the reentry reachability region under multiple constraints is designed. Using the virtual target method, an optimal control model for the reent...

In order to improve the quality and reliability of physiological signals, blind source separation and wavelet threshold methods were coupled to propose a multi-spectrum adaptive wavelet signal enhancement method, which was combined with an improved blind source separation method for denoising. To ev...

By combining the characteristics of high hovering performance and control efficiency of coaxial-rotor helicopters and the advantage of high-speed forward flight performance of double-thrust-propeller compound configuration helicopters, the coaxial rotor was applied to the double-thrust-propeller com...

Unmanned aerial vehicles (UAV) are widely used in low-altitude areas for power inspection, search and rescue, reconnaissance, and other tasks. The detection of obstacles in advance during flight aims to ensure the completion of established tasks. In order to meet the requirements of obstacle detecti...

Large flexible aircraft possess large structural deformation with aerodynamic loads, which makes the dynamic characteristics change obviously. Structural deformation predictions are vital to large flexible aircraft design and aeroelastic simulations. Full-order models like the finite element method ...

Frequency modulated continuous wave (FMCW) Doppler fuze is easy to be interfered with on the battlefield, resulting in an early explosion and loss of damage ability. To improve the anti-jamming ability of FMCW Doppler fuze against information-based jamming and realize the distinction between multipl...

Metal honeycomb cylinder structures frequently encounter a decrease in load-carrying capacity due to axial compression buckling. Extensive research has been conducted on their elastic buckling behavior. However, there are few theoretical studies on their plastic buckling behavior. To address this is...

Until recently, object tracking algorithms connected to deep learning have not considered the distinctions between regression and classification branches while employing shallow and deep feature fusion. Both branches used the same fusion feature, which could not meet the different task requirements ...

By using a cellular membrane capacitor and a potassium ion memristor to characterize the charge storage and memory function of a neuron, this paper modified the classical circuit model and got the mesoscopic circuit model of the Hodgkin-Huxley single ion channel neuron. Based on the classical circui...

The unit load device (ULD) is commonly shaped irregularly to fit the arc shape inside the cabin. This results in efficient loading of irregular ULD at the airport cargo station, which helps to increase the overall efficiency of air freight transportation. Considering a series of actual loading const...

In view of the trajectory tracking problem of the forward-tilting morphing aerospace vehicle with time-varying disturbance, a non-singular terminal sliding mode control scheme based on immersion and invariance (I&I) theory and fixed time convergence theory was proposed. Firstly, a time-varying d...

The algorithm solves the distributed cooperative task assignment problem with complex constraints among unmanned aerial vehicles (UAVs) with different capabilities in a more flexible way. Better solution accuracy and efficiency can be ensured by each UAV in the distributed task allocation framework ...

The prediction of aircraft taxiing trajectory helps to solve operational problems such as taxiing conflicts and long waiting times at airports, ensuring surface safety while improving service levels and increasing airport throughput. A model is proposed to predict the taxiing trajectory of a surface...