Ram air turbine (RAT) pump, by transforming the mechanical energy into hydraulic energy, can be used to control the aircraft rudder in emergency situation. Its performance of rapid response is critical to ensure the aircraft's safety. Exposed to low-temperature atmosphere for long time, the high vis...

For stealth aircraft, the scattering contribution of discontinuous targets becomes considerable. The common method is based on low scattering carrier and compares measurement results of carrier with discontinuity and that without discontinuity. The scattering increase of target with discontinuity is...

Although angle-cleaved fusion splice can greatly reduce the reflection of the fusion splicing point between photonic crystal fiber (PCF) and conventional single mode fiber, a weak residual back-reflection still exists at the fusion splicing point. A Mach-Zehnder and Michelson hybrid interferometer b...

Aircraft management system is an important part to guarantee flight safety, and redundancy design is the main method to improve the safety of the system. The redundancy design, however, is constrained by the budget (economy) in the design and manufacture and the consumption of the maintenance suppor...

When the conventional methods of sidelobe suppression are used in multiple input multiple output synthetic aperture radar (MIMO-SAR) systems to generate images for diagnosing the near field scattering features of targets, non-orthogonal sidelobes can hardly be suppressed efficiently. In this paper, ...

The rigid-elastic coupling dynamics has been widely used in the national defense and civil economic construction, but there are still no mature theoretical research results. In this view, the quasi-variational principle of the initial value problem was established, according to rigid-elastic couplin...

Surface plasmon (SPs) microscopy can measure local changes of refractive index on the nano scale and has been successfully applied in biomedical or semiconductor material fields. Here, we propose and develop a novel common-path confocal interferometric SPs microscopy. This technique delivers quantit...

Response signals in circuitry system always have the characteristics of high periodicity and sparse distribution. In order to realize response signals reconstruction in circuitry system, an algorithm combining gradient pursuit and K singular value decomposition (GP-KSVD) was proposed. Dictionary was...

High-altitude wind affects the fuel consumption and flight time of large passenger plane route flight. This paper is aimed at proposing a method to calculate the route performance of aircraft in high-altitude wind, and analyzing the effects of high-altitude wind on route performance of large passeng...

The solar array supplies power to spacecraft. Thus, it is important to predict power supply capability for spacecraft design and certification of on-orbit flight operation, and a calculation method for power supply capability of spacecraft solar array is proposed. The current versus voltage model of...

For the problems that the multiple instance learning (MIL) tracking algorithm does not distinguish the differences of each sample when computing the bag probability and selects the weak classifiers by maximizing the log likelihood function, which reduce the performance of classifier and increase the...

Plasma could increase chemical and heat effect at the same time during the fuel reaction and it is expected to be an effective technical way of ignition assistance. Plasma assisted methane ignition experiment system was built based on shock tube. The methane ignition delay time of autoignition, unde...

In aerospace industries, to solve the problem of big exit burr which leads to the difficulty in deburring operations and poor assembly quality of fastener after the traditional drilling process of the difficult-to-cut materials like titanium alloys using a twist drill, the rotary ultrasonic-assisted...

There are many kinds of micro-motion in the spatial cone target in flight, which can be divided into nutation, precession and spinning. Accurate acquisition of the target's micro-motion form is the premise for the estimation of the micro-motion and the structural parameters of the ballistic target. ...

As the development of lightweight design in manufacture industry, the application of thin-walled bent hollow tubes with various sections is expanding widely. In order to study the deformation behavior of bent tubes during hydroforming process and have a reliable process design, a theoretical model o...

In order to evaluate the reliability of a security system in the key area, security system reliability of a key area is defined in this paper firstly. Failure distributions of security devices are acquired after the test and estimation of security devices' failure information by exponential distribu...

In order to study the shedding and propagation of compressor rotors at high angle of attack, as well as the dynamic response under this transient process, a model with a stage of transonic compressor was simulated with unsteady numerical method and double direction iteration fluid-structure coupled ...

Aircraft engine is wearing during its service life and will finally break down. The wear fault can be diagnosed by analyzing the ferrography data of oil monitoring. The use of immune algorithm optimized support vector machine (SVM) in aircraft engine wear fault diagnosis was researched in this paper...

The non-line-of-sight (NLOS) error has great influence on the positioning accuracy of the ultra-wideband (UWB) indoor positioning technology. Aimed at this problem, this paper estimates the mean and variance of NLOS according to the joint statistical properties of the additional time delay in NLOS a...

In the process of monitoring aircraft metal structure crack, copper film sensor is exposed to atmospheric corrosion environment. The corrosion resistance of copper film sensor and crack monitoring performance after corrosion experiment were researched under the background. First, copper films were d...

Audio video bridging (AVB) Ethernet is an available Ethernet-based solution for audio and video stream transmissions within embedded networking context, in which credit-based shaping (CBS) algorithm is defined to guarantee the end-to-end latency performance according to stream models. When consideri...

Considering the difficulty in parameter setting, weakness of traditional situation assessment methods in processing and feature extraction of big data, feature of air combat data, applications of deep belief network (DBN) to close-range air combat situation assessment are discussed. A sample library...

In order to study the failure of dynamic system when the failure rates of components are uncertain, a new method is proposed to analyze the system failure probability when function time is given and function time when the threshold of failure probability is shown in system. Meanwhile, a new importan...

At present, for the multiple correlated complex computational models with uncertainty, the traditional validation methods still have some problems, such as difficult calculation and poor stability.Aimed at such complex computational models, a new multivariate model validation method is proposed base...

To guarantee the flight stability and high accuracy of path following for unmanned aerial vehicles (UAVs), a nonlinear path following method with adaptive guidance length is proposed. First, the kinematic model of UAVs was built. Second, the relation between guidance length and velocity of UAVs was ...

An numerical investigation was conducted to study the influence of micro jet with different total injection pressure on the supersonic flow field (Ma=2.9) for a 24° compression corner. The ejecting direction is vertical to incoming flow. The results show that the velocity of the fluid downstream the...