Load transfer ability needs to be detected termly to guide the maintenance and usage of concrete pavement of airport, while using the existing methods (such as falling weight deflectometer) is difficult to implement airport testing in remote mountain areas and the areas where transportation is diffi...

This paper is concerned with the cooperative attitude control of multiple spacecraft, and the control design method on special orthogonal group (SO(3)) with disturbance is studied. The multiple spacecraft system is modeled using SO(3) method and directed communication topology. Then, a time-varying ...

To study the galvanic corrosion behavior of three electrodes, polarization curves of CF8611/AC531 composite (CFRP), 7B04-T74 aluminum alloy (7B04) and galvanized 30CrMnSiA steel (GSB) were measured. Full immersion test of the lap joint in the simulated marine environment was carried out. The circula...

The data mining of aeroengine operational data is an important research for engine fault diagnosis. Due to the limitations of various algorithms, the accuracy of fault classification is difficult to be greatly enhanced with a single algorithm. Using a combination of classifications and diagnosis of ...

Based on the procedure of trans-atmospheric missile defense interception in each phase, this paper has firstly established a dynamic model for exo-atmospheric interceptor. Then according to the theory of predicted intercepting point (PIP) guidance and firing table interpolation, a method of exo-atmo...

Improving the pilot's situational awareness is an effective measure to ensure flight safety under the complex meteorological environment and system failure conditions. Based on the complex dynamics of pilot-vehicle-environment simulation, the risk variation trend of multiple flight safety parameters...

To improve the chip removal efficiency of percussive ultrasonic drilling, a rotary-percussive ultrasonic drill (RPUD) is proposed based on piezoelectric driving principle, which is driven by single piezoelectric stack. The proposed RPUD uses the vibration on both sides of the single piezoelectric st...

The latent heat thermal energy storage can be applied widely in aerospace domain and many other industrial fields. However, phase change materials suffer from low thermal conductivity that constrains their engineering application. Nano materials with high thermal conductivity can effectively improve...

The obvious shortcomings of bag of feature (BoF) model are lack of spatial and geometric information in image representation, and poor description of the content of texture image. To solve these problems, we proposed a texture image classification method based on BoF model with multi-feature fusion....

To improve the cutting performance and hobbing efficiency of an hourglass worm gear hob, it is necessary to design the flutes of the hob into spiral groove, reduce the absolute value of the rake angle on both sides of the cutting teeth, and equalize the cutting conditions on both sides of the blade....

The Lambert two-impulse rendezvous problem is an important problem in orbital-transfer, rendezvous and docking and other fields in space engineering. Fuel-optimal and energy-optimal Lambert rendezvous problems are a kind of Lambert optimization problem that has the typical application background and...

Aimed at the problem that the early fault of the flywheel is difficult to detect and the precision mathematical model is difficult to be established, a fault detection method based on the characteristics of chaotic attractor is proposed. This method uses the auxiliary curved surface function and the...

A method for constructing knowledge networks based on the fitness of node's innovation ability is proposed for O2O e-business enterprises to make accurate judgment on the knowledge innovation field and improve the innovation competitiveness. This paper, based on the analysis on influence factors of ...

The increase demand for global services in recent years has led to the deficiency of resources in traditional low frequency band in low earth orbit (LEO) satellite communication. Thus designs of LEO satellite constellation in Ka band have drawn a lot of interests. However, utilization of Ka band in ...

An adaptive bilateral control strategy is proposed for the uncertainty of the mathematical model and external disturbances during the teleoperation of underwater manipulator. A reference adaptive impedance control law based on the nominal model is designed for the uncertainty of the parameters of th...

With the rapidly continuing growth in demand for flight activities and the increasing airspace usage conflicts, the global optimization of air traffic flow management has become an essential approach to reduce flight delays, decrease flight risk and ensure airspace operation safety. As a typical are...

In the analysis of fatigue life of multiple riveted joints, the explicit dynamic analysis of the pressing and riveting process was carried out, and the deformation form and interference after riveting process were obtained. An APDL subroutine was developed to analyze the riveting process of various ...

The performance of supervised learning based algorithms can decrease dramatically in the classification of remote sensing images if labeled samples are insufficient. The collection of labeled samples is generally time-consuming and expensive, though unlabeled samples can be relatively easily obtaine...

Small unmanned aerial vehicle (UAV) aerial images (low-altitude remote sensing image) of arable land in hills and mountains are confronted with multiple challenges of image processing due to its scale change, geometric distortion and image overlap. To address the problems, the low-altitude remote se...

Considering the aircraft engine full envelope tracking control under the nonlinear variation dynamic feature within wide range, the decentralized robust tracking controller is proposed. In order to ensure system stability and at the same time make the convergent rates of tracking errors adjustable, ...

Considering that the traditional extended Kalman filter (EKF) algorithm has to neglect the higher order terms of the measurement model because of linearization, which causes the problem of large truncation errors in X-ray pulsar navigation, an improved linear measurement equation suitable for pulsar...

In order to improve the dynamic characteristics of the micro-positioning stage, a decoupled two-degree-of-freedom (2-DOF) parallel flexure-hinge micro-positioning stage is proposed. First, a new type of 2-DOF micro-positioning stage is designed based on the structure characteristics of the corner-fi...

This paper proposes a novel method for solving the problem of multi-goal redundant manipulator trajectory planning. Specifically, Specifically, the trajectory planning path for a redundant manipulator is a complicated process with the joint constraint and the limit of spatial obstacle. First, to ens...

Lithium batteries have the advantages of light weight and safety, long cycle life, and good safety performance. As a widely-used energy storage power supply, lithium battery health management and life prediction are hot topics both at home and abroad. Lithium battery life assessment methods and pred...

Motivated by identifying the turn rate of fighter zigzag maneuver under the background of colored measurement noise, the joint estimation and identification algorithm with colored measurement noise is proposed based on expectation maximization (EM) algorithm by considering the characteristics of the...

The stratospheric wind field has an important influence on the design and trajectory control of the near-space low dynamic aerostat. Focused on the modeling of the stratospheric wind field, this paper proposes a reduced order analysis method of the wind field data based on the proper orthogonal deco...