Failure of complex systems is usually the result of dependent competing between degradation failure and sudden failure caused by some random shocks. In this paper, a degradation-shock dependent competing failure model and reliability evaluation method based on nonlinear Wiener process are proposed f...

In order to improve the performance of cabin environmental control system and reduce the difficulty of design and manufacture, the split four-wheel air cycle refrigeration system was proposed. Two split two-wheel turbine coolers were used instead of integral four-wheel cooler. Based on the enthalpy ...

For the self-alignment problem of the multi-sensor redundant inertial navigation system, the data fusion algorithm of the inertial navigation system is studied based on ten-sensor inertial navigation system which consists of three-orthogonal and two-skew sensors. The validity of the least square est...

To improve layout design efficiency and provide technical support for the rapid simulation design system of civil aircraft cabin, a quantitative design model for civil aircraft cabin layout is proposed. The ergonomic demand-oriented model took seat row distance, seat row number and cabin section len...

Based on the 20-100 km atmospheric density data observed by TIMED/SABER satellite from year 2002 to 2018, the global grid data of monthly average and standard deviation are calculated statistically. Based on the grid data, the characteristics of atmospheric density variation are analyzed. The relati...

For the aersevoelastic model including servo actuators with time-delay segment, the design method of gust alleviation control system is proposed based on Padé approximation and Linear Quadratic Gaussian (LQG) control method. Padé approximation was used to linearize the time-delay segment to a high-o...

Foreign body reaction is one of the key factors limiting the application of implantable biomaterials. This study evaluates the in vivo immune response of acellular Small Intestinal Submucosa (SIS) materials treated with irradiation and Ethylene Oxide (EO) sterilization technology for providing a bas...

For the problem of fault estimation with unknown disturbance, a fault estimation method based on Adaptive Super-Twisting Sliding Mode Observer (ASTSMO) and Unknown Input Observer (UIO) is proposed. This method does not require that the upper bound of fault derivative is known, which avoids the probl...

Considering no maintenance, minimal maintenance, replacement maintenance and multiple intermediate maintenance levels, a selective maintenance model for the complex system is proposed based on Particle Swarm Optimization (PSO) algorithm and multiple repairpersons. In the imperfect maintenance model,...

An Switch in linear-nonlinear Active Disturbance Rejection Control (SADRC) attitude decoupling control approach was proposed due to the underactuated, strong coupling characteristics of quadrotor. First, the mathematical model of the quadrotor attitude was formulated by taking quadrotor aircraft pla...

Semi-autonomous driving bus platooning refers to the vehicle organization technology that connects bus units together through vehicle communication technologies to realize coordinated driving of vehicles and dynamic design of vehicle capacity. Based on semi-autonomous driving us platooning, a dynami...

The turbine engine under unheated conditions produces thrust loss and influences the safety of carrier-based aircraft ski jump takeoff. The difference of the takeoff limit weight under heating and unheated conditions is analyzed. The dynamic model of carrier-based aircraft ski jump takeoff is establ...

Aimed at the problem that the Fully Convolutional Siamese Network (SiamFC) is easy to fail to track when it is disturbed by similar object or the target has large-scale appearance changes, this paper proposes a Siamese network visual tracking algorithm based on cascaded attention mechanism. First, t...

In the space-ground quantum key distribution network, the hardware device limitation of the air platform makes the data transmission speed and processing capability of the post-processing stage weakened. Aimed at the characteristics of free space and airborne platform, this paper proposes a data rec...

The dynamics modeling of the tilt-rotor aircraft is studied during dynamic transition process. Firstly, starting from the multibody dynamics, a box-wing tilt-rotor UAV is taken as an example, which is assumed as a multi-rigid-body system consisting of wings, a body, ducted fans, tilt rotors, etc. Se...

Due to the problem that the rotor position of sensorless Permanent Magnet Synchronous Motor (PMSM) cannot be accurately observed at high speed, which causes distortion of three-phase current fluctuation, an improved Sliding Mode Observer (SMO) is proposed to estimate the rotor position and speed mor...

Aimed at the problem that the rotor suspension precision and stability will be reduced due to the gimbal excitation effect of the Magnetically Suspended Control Moment Gyroscope (MSCMG), a composite control method combining angular acceleration rate adaptive feedforward control and Active Disturbanc...

Pigeon-Inspired Optimization (PIO) algorithm has been widely used in the field of UAV formation and control parameter optimization, but the standard PIO algorithm is easy to fall into local optimum. This paper proposes an Adaptive Learning Pigeon-Inspired Optimization (ALPIO) algorithm. The algorith...

Aiming at the problem of air combat target threat assessment under uncertain information, a threat assessment model based on Rough Set (RS) and Criteria Importance Though Intercrieria Correlation (CRITIC) method is proposed. Firstly, the model determines the target threat value under accurate inform...

In order to provide the reconstructed images which are suitable for the clinical imaging diagnosis, this study focuses on reconstructing the tomographic images from sparse projection data with sufficient accuracy under the premise of significantly reducing the X-ray dose of Computerized Tomography (...

Mounted on the Geostationary Earth Orbit (GEO) and Unmanned Aerial Vehiclel (UAV) platforms, the GEO-UAV bistatic Synthetic Aperture Radar (SAR) can achieve precise and quick observation on the interested areas. The two-dimensional resolution ability is important performance metrics. The analysis on...