For composite bonded joints with thick adhesive layers, finite element method is applied to calculate the ultrasonic reflection/transmission coefficients when bonding interfaces and cohesion of adhesive layers are degraded. In the simulation model, the boundary conditions of the spring model used in...

In view of the problems of subjective route selection and insufficient network information mining in the research of new air routes discovery, and considering the topological structure characteristics and nodes (navigable cities) hierarchical attributes of air transport network, a New Air Routes Pre...

It is difficult to construct in a high-intensity radiation field laboratory environment, and the application of dual Bulk Current Injection (BCI) probe instead of irradiation methods for interference immunity research has broad prospects. Aimed at the current unclear coupling mechanism between dual ...

To solve the problems existing in the traditional Multi-Sensor Multi-Target Multi-Bernoulli (MS-MeMBer) filter in the high clutter density scene, such as poor quality of measurement partitioning hypothesis and biases of cardinality estimation, an improved MS-MeMBer filter based on clutter measuremen...

Aimed at the problems of low efficiency and high error rate of aircraft harness tooling drawing design, the core content and predicate logic of each design phase were studied. The Trunk-Branch Tree (TBT) model, which has the characteristics of undirected graph and multi-way tree, was proposed to rep...

The tie-down aerodynamic load is used as the design input for the mooring device of the helicopter. In the past, it was usually calculated based on the wind tunnel test data of the large wind side angle aerodynamic characteristics of the fuselage. First, the CFD method was used to calculate the aero...

In order to realize the automatic docking of ground composite umbilical connector for heavy launch vehicle with rocket interface, enhance the safety and reliability, and reduce safeguards of launch preparation process, first, the technology and overall strategy of automatic docking of composite umbi...

In order to study the dynamic stability of an air-breathing hypersonic vehicle under coupling motion of pitch/roll, based on the aerodynamic/kinematic coupling numerical simulation method and theoretical analysis, the numerical simulation of forced pitch/free roll coupling motion of an air-breathing...

Accurate measurement of aerodynamic heating is an important issue for hypersonic vehicles to choose reasonable heat resistant materials and thermal structure design. However, it is still difficult to measure the heat flux accurately in shock tunnel experiments, and any slight deviation from ideal co...

The availability of Global Navigation Satellite System (GNSS) signal in high-orbit space deteriorates, which puts forward higher requirements for the signal tracking performance of GNSS receiver. The received power characteristics of GNSS signal in high-orbit space are analyzed by using the GNSS sig...

Global Positioning System (GPS) Doppler observation is affected by multipath, which leads to a huge error in velocity calculation. In response to this problem, starting from the causes of Doppler observations, through kinematic analysis, a model of the relationship between the overall motion of rece...

In the automatic drilling process of the robot, the position of drilling is usually obtained from the process digital model of the workpiece to be drilled, and the position deviation and deformation will occur during the installation process of the workpiece to be drilled. Hence, the hole position a...

In order to improve the ability of disturbance rejection of quadrotor UAV attitude control, this paper presents an improved Active Disturbance Rejection Controller (ADRC) with nested structure of inner and outer loops. The numerical simulation model of quadrotor UAV attitude control system is constr...

In order to improve the safety of non-cooperative target's close-range approach trajectory, and optimize the approach time and fuel consumption at the same time, this paper designs the dynamic safety corridors of uncontrolled rotating satellite for the proximity to rotating non-cooperative target. T...

Linear Frequency Modulation (LFM) signal is a commonly used transmission signal of modern radar, which can effectively improve the range resolution and speed resolution. However, when Smeared Spectrum (SMSP) jamming is applied to the main lobe self-defense jamming, the jamming signal and the target ...

The advantages of Wireless Avionics Intra-Communication (WAIC) in reducing aircraft weight and saving cost make it have considerable prospects in the application of avionics systems. In this paper, a Media Access Control (MAC) protocol based on Priority-Deficit Round Robin (PDRR) scheduling is propo...

Exoskeleton robots, as newly proposed smart devices to improve and enhance human life ability, require efficient and intelligent human-computer interaction systems, and the first step of human-computer interaction is to accurtely predict human behavior intention. From the perspective of top-level co...

A novel composite Phase Change Material (PCM) based heat sink is proposed to cool chips under high ambient temperature. Physical and numerical model is proposed for the heat sink. High alcohol/expanded graphite composite material is chosen as PCM in the heat sink. Numerical model is obtained with th...

In order to estimate the performance of infrared air-to-air missiles and improve its combat effectiveness, an overall valid evaluation of missiles' anti-jamming capability is required. However, due to the infinite number of countermeasure situations, most scholars currently study and analyze them ba...

To reduce the Sidelobe Level (SLL) of the antenna and widen the bandwidth, a 16-element coupled-feed microstrip array antenna with non-uniform spacing at 14.25 GHz frequency was designed. The antenna adopts a multi-layer design, and a rectangular groove is formed in the ground layer to perform coupl...

In view of the fact that most Plastic Ball Grid Array (PBGA) packaged chips are only subjected to high and low temperature alternating tests in accordance with the US military MIL standard, resulting in a large deviation in predicted service life, this paper converts the microcomputer control chip m...

In recent years, Convolutional Neural Networks (CNNs) have been widely adopted by computer vision tasks. Due to the high performance, energy efficiency, and reconfigurability of FPGA, it has been considered as the most promising CNN hardware accelerator. However, the existing FPGA solutions based on...

The properties of epoxy resin matrix composites are sensitive to hygrothermal environment, and it is of great significance to investigate the moisture absorption behavior of epoxy resin matrix composite structures for its practical application. Based on the non-Fickian moisture absorption model of c...

Geomagnetic matching navigation technology is an important auxiliary navigation guidance method. The construction accuracy of geomagnetic reference map plays a decisive role in the accuracy of geomagnetic matching guidance. Aimed at the problem that the construction accuracy of the existing geomagne...

In order to reduce the random drift of Micro-Electro-Mechanical System (MEMS) gyroscope, an improved random drift analysis method of MEMS gyroscope is proposed, based on an improved Empirical Mode Decomposition (EMD) and a mode set selection criterion, combined with the method of time series model a...