Due to the difficulty of machining large-size involute artifact, it is even more difficult to measure, and as a result, the transmission of values in large gears has always been a problem. In this paper, an arc is used instead of involute tooth profile to construct a new type of large-size involute ...

In order to ensure the flight safety of general aviation aircraft in low-altitude airspace, an improved model of flight conflict detection based on support vector machine (SVM) is proposed. First, according to the physical form and flight status of the aircraft, a protection zone suitable for the ge...

In order to solve the problems such as insufficient transmittance estimation and color cast of results of dehazing algorithms, an image restoration algorithm based on minimum channel interval estimation and transmittance adaptive constraint model is proposed. Firstly, bright channel of hazy image is...

In order to study the correlation between accelerated aging test and natural exposure test, a comparative test between the exposure test and accelerated test on typical 7B04 T74 aluminum alloy-30CrMnSiA steel-7B04 T74 aluminum alloy connectors with double row 8 steel screws was carried out. The spec...

The structural diseases on airport pavement, such as cracks, corner fractures, broken seams, and repairs, have the characteristics of narrow width, different length, and less pixel proportion in the image, which show a thin strip-shaped structure, and the contrast is low in the complex background. T...

Compared with low dynamic range (LDR) images, high dynamic range (HDR) images have a wider color gamut and higher brightness range, which is more in line with human visual effects. However, since most of the current image acquisition devices are LDR devices, HDR image resources are scarce. An effect...

The traditional FastSLAM algorithm requires a large number of particles to build the map, thus resulting in high computational complexity and difficulty in improving the estimation accuracy. In view of these problems, an algorithm of FastSLAM for mobile robot is presented based on box particle filte...

Based on Timoshenko's beam theory and K-V damping model, the method for the frequency domain vibration solution of the non-proportionally damped beam under a stationary impact load is studied. The dynamic response of the damped beam is derived by introducing traditional Laplace transformation and Du...

High-speed windblast experiments of pilot helmet-mounted night vision goggle system were carried out to study its aerodynamic characteristics and the forces on human cervical vertebra, and to evaluate the influence on the safety of ejection life-saving, so as to provide a basis for the design and us...

In order to improve the structural design efficiency, design quality and iterative efficiency of the spacecraft casting cabin in the scheme demonstration stage, the structural parameters of the casting cabin are studied in combination with structural characteristics of the spacecraft with complex su...

The design of advanced rotor airfoils is a typical multi-design-condition and multi-objective optimization problem, and traditional optimization methods cannot meet the requirement of high-dimensional multi-objective optimization design for airfoils. In this paper, a many-objective optimization desi...

This paper proposes a small sample lifetime evaluation model based on Bootstrap method for aerospace products which have the characteristics of small sample and long service life. Using B-spline function as the Bootstrap sample empirical distribution function, a random case sample with replacement i...

Energy management strategy is one of the core technologies of hybrid electric vehicles, which determines the fuel economy and emission performance of the vehicle. Aiming at the problem that the existing energy management strategies of hybrid electric vehicles are all developed based on the fixed ope...

With the increasing maturity of technology for preparing furfural, 5-hydroxymethylfurfural, levulinic acid from lignocellulose biomass, platform compounds reuse technology has become an international hot spot. By studying the characteristics of the self-condensation and cross-condensation processes ...

For airliner with a wing-mounted engine layout, in order to ensure ground clearance, the pylon has to be short, which leads to a slat cutout, and the nacelle wake of the engine generates low energy flow and even flow separation on the upper wing surface. Numerical simulation method has been used to ...

There are many challenges including occlusion, illumination and posture variation in the facial expression recognition under natural conditions, leading to the low accuracy. This paper proposes a new deep learning network model for facial expression recognition. This model uses ResNet as backbone, a...

The three-dimensional material warehouse unit is an important sheet metal storage center in the sheet metal automatic intelligent production line. Its reliability is directly related to the reliability of the sheet metal automatic intelligent production line. Therefore, failure mode and effects anal...

Compared with traditional vehicles, electric vehicles have a broad application prospect under the background of rapid development of new energy. As one of the power sources of electric vehicles, the performance of battery is easily affected by temperature. Battery thermal management system, which ca...

In order to study the inconsistency and uneven behavior of temperature in lithium-ion batteries packing, based on the electrochemical-thermal coupling model, this paper takes eight pouch batteries as an example, establishes different circuit modules through different series and parallel connection m...

Accurately grasping the actual power of energy storage battery is one of the key factors for the stratospheric airship to realize long-time flight. First, a simulation model of a stratospheric airship energy system was established to analyze the energy input and consumption dynamically. Then, chargi...