Cable coupling is one of the most important reasons for electromagnetic compatibility problems in avionics systems. Monitoring the cable coupling effect is of great significance. A method of monitoring the coupling signals on the ports with the spare wire in the cable is introduced. Since the monito...

Modular design and development technology can realize flexible manufacturing of complex product system (CoPS), but inappropriate modular decomposition will increase managerial difficulty and manufacturing cost. Based on the analysis of the product system modularization theory, this paper summarizes ...

To meet the self-navigation need of light-weighted robots, e.g. small UAV, we propose a multi-dimensional geometric feature extraction method for monocular SLAM. Feature points based SLAM mapping method is vulnerable to noisy samples and its description efficiency of complex environments needs to be...

The problem of some elements' damage often appears when finite element calculation of using UH model UMAT is conducted, including tension failure and shear failure. The failure stress state not only makes the results unreasonable, but also reduces the stability of calculation. To solve the problem g...

The NURBS based free-form deformation (NFFD), which is universal for representation of object geometry, and whose control point influence zone is local for geometry deformation, is used widely for aerodynamic shape optimization. By extending the control volume and locating the outer control points a...

Aimed at the accurate evaluation of the altimetry system error for the automatic dependent surveillance-broadcast (ADS-B) height keeping performance monitoring, a data smoothing and fitting analysis method based on the kernel smoothing and mixed-Gaussian distribution was proposed. The kernel smoothi...

In order to study the effect of high strain rate loading on the deformation and failure of carbon fiber reinforced resin matrix composites, a numerical damage model, in which the stiffness and strength of composite material were modified by the strain rate correction method, was established in consi...

Flying wing aircraft usually uses multiple aerodynamic control surfaces for flight control. The aerodynamic control surface has a complex structure and control efficiency decreases dramatically at large angles of attack due to flow separation. The plasma actuator is usually used in flow control due ...

A novel pan-sharpening method was proposed for the fusion of multispectral image and panchromatic image. First, the original image was transformed from spatial domain to framelet domain by intensity, hue, saturation (IHS) transform and non-subsampled framelet transform. Second, the statistical fusio...

Because analysis models in earthquake emergency response system (EERS) have special characteristics, traditional model management methods in decision support system are not suitable well for the management requirement of analysis models. We propose a loose-coupled mechanism, called loose-coupled mec...

Multiple shift-frequency jamming is an effective coherent jamming type to linear frequency modulation (LFM) pulse compression radar, which could produce multiple false targets before and after real target when it is applied in self-defense jamming. Considering the jamming suppression problem, a meth...

A range deception jamming discrimination method based on the multiple-input multiple-output (MIMO) radar with frequency diversity array (FDA) is proposed. In FDA-MIMO, the phase difference or spatial frequency between different elements of echo is dependent on both range and angle, which implies tha...

This paper proposes a method of structural robust topology optimization under the periodicity constraint. A robust topology optimization model for periodic structures is proposed for linear elastic structures. Then, the formula of the sensitivity number is developed, and the robust topology optimal ...

Military aircraft is a complex repairable system, instantaneous availability analysis of it is a difficult problem in the integrated logistics support field. The stochastic maintenance task net (SMTN) based on mission requirement and technical condition of the military aircraft is constructed, and t...

Fatigue properties on crack propagation rate at low and elevated temperatures are the precondition of damage tolerance design for aviation metallic structures. Therefore, in order to determine fatigue properties on crack propagation rate, fatigue tests were performed on six categories of aluminum al...

An ultrasonic bearing that can support radial and axial loads simultaneously is proposed based on piezoelectric-driven principle and ultrasonic levitation technology. Supporting in two directions can be achieved only relying on single excitation source, which brings about compact structure and simpl...

A rigid-flexible coupled dynamics model was established for simulating and analyzing the soft landing process of the novel leg type lander. Three groups of bad landing conditions, in which the lander most easily overturns, bottom surface of the lander most easily collides with rocks on the surface o...

Existing effectiveness evaluation methods for single helicopter forest firefighting training only aim at process of firefighting and getting water, ignore contributions of other processes during task to the training effectiveness, and assume mutual independence of indexes, which leads to incomplete ...

For the purpose of solving GPS signal fast acquisition problem under the high dynamic, a coarse acquisition method combining improved partial matched filter (PMF) and fast Fourier transform (FFT) was proposed. The principle and structure of PMF+FFT were analyzed, and windowing of traditional method ...

For numerical scheme in computational fluid dynamics (CFD), limiter technology is an important factor affecting computational accuracy and stability. Although the present classical second-order total variation diminishing (TVD) limiters with a wide application can well satisfy the computing requirem...

Based on sliding-mode control and adaptive control, the passive fault-tolerant attitude control problem of rigid spacecraft using single gimbal control moment gyros (SGCMGs) was studied. First, the system mathematical model with fault of the speed of gyro framework was established. Then, a fault-tol...

A human-machine real-time path planning strategy in complex battlefield environment is proposed when unmanned aerial vehicle (UAV) is performing tasks and encounter unexpected threats. Human undertakes the tasks of making decision and analysing threat information, and then sends the messages of dire...

To improve the accuracy and efficiency of few-view computed tomography (CT) image reconstruction, CT image reconstruction is studied from limited view and sparse view, and a novel objective function of total variation norm is proposed. According to the newly-developed objective function, the next it...

Aimed at morphing aircraft with variable sweepback, this paper studies the issue of modeling and control for a class of morphing aircrafts. Fitting the relationship between aerodynamic parameters and sweepback, we developed linear parameter varying (LPV) model by Jacobian linearization approach. The...

An experimental investigation using a rotating platform was performed to obtain the critical heat transfer performance of steam-water two-phase flow in a rectangle tube under inverse load. By changing the parameters such as magnitude of inverse load, inlet subcooling and mass flow rate, the critical...

Stiffness is an important performance index for the dynamic performance and positioning precision of compliant micromanipulator. Concept of transfer matrix in engineering was applied to the stiffness analysis here. First, according to its structure characteristics, the compliant micromanipulator was...