Focusing on the trend of massive, networked, and intelligent development of in-orbit satellites, this paper explores the background, concept, and trends of software-defined satellite technology as well as the challenges it is faced today. First, it is presented that the satellite system is evolving ...

Based on dynamic emergency evacuation test environment, the effects of adverse attitude on emergency evacuation were studied and more than two hundred tests, including individual evacuation and group evacuation tests, were implemented. Then the average evacuation speed of individuals at seat and ais...

An improved particle swarm optimization-radial basis function (PSO-RBF) neural network adaptive sliding mode controller is proposed for quadrotor systems with nonlinearity, strong coupling, and inaccurate interference. First, based on smooth improvement of the control amount of the RBF neural networ...

The cooperation of the two-dimensional pointing mechanism and the infrared detector is conducive to the realization of large-scale dynamic tracking, pointing, and rapid positioning of space targets. Coupling the cryogenic loop heat pipe (CLHP) with the two-dimensional pointing mechanism can greatly ...

Aiming at the problem that the power supply vehicle is prone to sensor fault due to the complex operating environment, a sensor fault detection and data reconstruction method based on spatiotemporal correlation is proposed in this paper. Firstly, according to the time-series relationship characteris...

It is difficult for the common time series pattern matching methods to balance the computational complexity and matching accuracy. To solve this problem, a time series matching method based on segmented extraction of feature points is proposed. Firstly, the feature points on each variable dimension ...

On the basis of the angle conversion method, a brand-new accurate orbit determination technique for space debris was developed. First, based on the commonly used two-line-element (TLE) data application requirements, a TLE precise orbit determination model based on the SGP4/SDP4 forecast model was es...

This paper primarily employs the 1D3V particle-in-cell (PIC) method to investigate the rule of multifactor of aluminum material on satellite surface under the strong electromagnetic environment of space in order to study the charge and discharge effect brought on by the strong electromagnetic enviro...

The hygrothermal environment is one of the main factors affecting the mechanical properties of composite laminates. To maintain the safety of the flight structures, it is crucial to study how hygrothermal conditions affect composite structures.The tensile fatigue properties of carbon fiber composite...

The suppression of mainlobe jamming (MLJ) is a hard task and an open problem in the radar field. This paper considers the problem of radar target direction estimation in MLJ. Hence, we propose a sparse estimation method for radar target direction with sliding-window subarray configuration in MLJ. ML...

One type of missile swarm system is proposed, where numerous small UAVs are compressed in a missile carrier, to solve the weakness of swarm penetration capability and operational radius while speeding up the formation of cooperation. It uses tactics by multistage transport, making the swarm deploy r...

Multi-objective optimization of aerodynamic layout is a key technology in aircraft design. A new multi-objective optimization method is proposed for aerodynamic shape parameters of hypersonic reentry vehicle, and then the influence of the method on the performance of hypersonic reentry vehicle is pr...

To investigate the mechanism of butterfly flapping wing flight and develop a low-frequency flapping wing bionic robot, the fligh kinematics of the butterfly are capturedand documented using a high-speed camera, three characteristic motion states of butterflies are proposed: flapping wing motion, tho...

Soil moisture retrieval using Beidou geostationary Earth orbit (GEO) interference signal power was studied. Current researches mainly establish empirical models for retrieving soil moisture. Therefore, a semi-empirical retrieval method was proposed. Taking the advantage of Beidou GEO satellite’s sta...

To investigate the influence of key parameters of the lower surface jet on aerodynamic performance of supercritical airfoil, a numerical simulation is performed using Reynolds average Navier-Stokes (RANS) equation and Spalart-Allmaras (S-A) turbulence model. By comparing the flow field between the b...

The four stages of blood pump weaning are used to methodically assess the hemodynamic performance and hemocompatibility of the datum and modified centrifugal blood pumps. The distribution of parameters and the changes of normalized index of hemolysis in four stages of weaning are researched, the pre...

We develop an aeroelasticity and flight dynamics simulation model with nonlinear aerodynamic reduced order model for low-speed solar unmanned aerial vehicles under high angle of attack caused by gust. Five aerodynamic reduced-order models are created in light of the aforementioned issues, and their ...

Conventional milling (CM) causes problems for titanium alloys, such as high cutting forces, large deformation of thin-walled workpieces, low processing efficiency, and severe tool wear due to low cutting speeds. To address these problems, a new method of high-speed ultrasonic vibration milling (HUVM...

The Shupe bias error is one of the biggest bottleneck problems in the engineering application of interferometric fiber optic gyroscope (IFOG). A turn-by-turn finite element model for fiber coils is established in this article. Based on this model, analyze the temperature performance of the 8 level, ...

In the process of large-scale workpiece machining, the insufficient extension space of the executive mechanism is an urgent problem to be solved in the aerospace manufacturing industry. To increase the working space at the end of the executive mechanism, and to provide the mechanism with a stable an...

The ultrasonic drill has the characteristics of lightweight, low power consumption, the small axial force required, easy real-time detection and in-situ analysis, and good adaptability to different objects. It is highly anticipated in exploring new scientific drilling technologies and new methods su...

In the field of autonomous driving, pedestrian trajectory prediction has been one of the research hotspots, and the uncertainty of pedestrian behavior poses a great challenge to trajectory prediction. Most of the current trajectory prediction methods only focus on the information interaction between...

The establishment of animal model of femoral head necrosis is of great significance for the clinical treatment of this disease. To successfully induce femoral head necrosis while reducing the mortality of modeling animals, this study improves the commonly used modeling method of steroid-induced femo...

To investigate the influence of rotor/wing aerodynamic interference on the high-speed flight performance of a dual-propeller propelled compound helicopter, a flight performance prediction model of compound helicopters is established. Taking the AS365N ‘Dolphin’ helicopter equipped with a wing and pr...

In order to accurately perceive the operating environment of the airport surface, a weakly supervised evaluation method of traffic situation based on metric learning is proposed. Firstly, according to the space-time distribution types of aircraft on the airport surface, the traffic situation index s...

Soil moisture(SM) information can be obtained through the high spatial and temporal resolution spaceborne GNSS-R technology, however, open water will affect the accuracy of the retrieval results. To solve this problem, this paper proposes an improved method of removing open water. Prior to precisely...

The optimization of information interaction topology for persistent unmanned aerial vehicle (UAV) formation is an important basis for the stability of UAV formation structure and the timeliness of task execution. The existing formation generation algorithms assign weights and generate topologies bas...

When the control moment gyro (CMG) is used to achieve agile attitude maneuvering control, the mechanical CMG vibration should be effectively isolated after the maneuvering is in place to achieve high-stability attitude control, while the rapid response of the control output torque is ensured during ...

Structural systems with dynamic output performance has gained more and more attention in engineering practice. However, most existing surrogate models for estimating time-dependent reliability of such systems only consider the effect of the random variables which are acting on the system at the curr...

Aiming at the conflict resolution problem in unmanned air traffic management (UTM), real-time collision avoidance algorithms based on reachability set analysis are proposed. To assure the secure operation of unmanned aerial vehicles (UAV) in low-altitude urban environments with dense traffic flow, t...

The performance of semantic segmentation based on deep learning still need to be improved when analyzing small-sized objects and object boundaries in remote sensing images. Aiming at this problem, we propose a U-shaped network (SGE-Unet). Firstly, the structure of the model is optimized to enhance t...

To ensure the strict time determinism of message transmission between avionics communication tasks, time-triggered (TT) communication methods are also applied to the off-chip interconnection network. When avionics tasks have multiple operation modes, the time-triggered schedules between chips belong...

To achieve the three-dimensional tomography for detecting debonding defects of carbon fiber reinforced plastic (CFRP) laminates based on infrared pulse thermal wave imaging, consummate the out-field quantitative detection guarantee system, and improve the safety and reliability of laminates in servi...

A correlation radiometer structure with uniform multiphase modulation around the circumference is proposed in order to address the issue of decreased measurement accuracy caused by the operational amplifier’s offset drift and gain fluctuation in correlation radiometers. The measurement result is pro...

A mathematical model for gust response analysis is established for a wing with camber morphing trailing edges, and a simulation study of gust response alleviation is carried out. The computational fluid dynamics method is used to calculate the generalized unsteady aerodynamic force under the given d...