In this paper, we build a directed function call software network model by analyzing the source code of the open source software tar and MySQL. The network structural properties, such as degree distribution and clustering coefficient, are investigated. The results indicate that the coupling of multi...

In order to solve the problems of manual installation and inaccurate positioning in the process of aeroengine installation, an improved SSD algorithm (ResNet-Dilated SSD, R-D SSD) is proposed to meet the detection requirements of aeroengine installation station in the research of its automatic insta...

As an important part of the aircraft door, the relief valve mechanism plays an important role in maintaining the normal and safe operation of the aircraft. In this paper, the multi-body dynamical model of the relief valve mechanism is built in ADAMS to study the effect of pin wear on positioning acc...

The rapid development of Internet of vehicles has promoted the research and development of digital key. In order to solve the communication security problem between digital key and car locks, a security model and password authentication key exchange protocol are proposed. The protocol completes the ...

Aimed at low position resolution and slow response of on-off valve controlled cylinder, a hydraulic cylinder position system controlled by piezoelectric high-speed on-off valve was designed. Firstly, the position system model of on-off valve was built in order to analyze the influence of PWM carrier...

In order to solve the technical problem of accurately evaluating radiation effects of spectrum-dependent equipment in complex electromagnetic environment, based on the basic theory of electromagnetic wave coupling transmission, this paper deduces and reveals that the poor linearity and insufficient ...

In recent years, Unmanned Aerial Vehicle (UAV) has become a new combat force. In order to solve the flight conflict between military UAV and civil aviation and ensure flight safety, this paper improves the classic EVENT model and proposes a collision risk model suitable for UAV. The influence of nav...

In the process of evading the space target, the spacecraft should take into account the absolute motion of flight along the transfer orbit and the relative motion of evading the space target. The corresponding path automatic planning is difficult, and there are few public research results at home an...

A new method is proposed, for the optimal design of Series-Hybrid Electric System (S-HES) equipped on the unmanned convertiplane, to cope with the special power demand of this type of new aircraft. The method includes multiple physical and mathematical models to describe the characters of convertipl...

Based on the observation data of TIMED/SABER from 2002 to 2018, atmospheric density influence on aerothermodynamic environment of hypersonic vehicles is analyzed at 20-80 km. Based on the estimation method of heating transfer on stagnation in engineering, the relationship between the atmospheric den...

Flutter is a dangerous aeroelastic instability form. The influence of actuator dynamic stiffness on the fin-actuator system flutter characteristics cannot be ignored. Therefore, accurate actuator modeling and simulation are necessary. A modular modeling method and dynamic stiffness computer simulati...

An aerodynamic component-oriented flight dynamic model of joined wing aircraft was established based on the joined wing aircraft aerodynamic force and moment distribution characteristic, and a simulation platform is established by combining the computational fluid dynamics and flight dynamic simulat...

Since test optimization selection plays a vital role in the test design of various equipment systems, in the testability design of various types of equipment, test unreliable factors seriously affect the optimization of test selection. First, this paper describes the mathematical model of the multi-...

Due to fuel consumption of orbital maneuvers, payloads' load and separation, and the release of small satellite, the Center of Mass(COM) of Tiangong-2 space laboratory moves. To solve this problem, a reduced orbit dynamic determination and COM estimation method is given based on Global Navigation Sa...

To solve the problem of Unmanned Aerial Vehicle (UAV) swarm search in unknown environment without prior information, this paper proposes a UAV swarm cooperative search algorithm with pheromone as decision mechanism. Firstly, considering the communication constraints of UAV, two search models which a...

Two typical Gasoline Direct Injection Vehicles (GDIVs) were selected, and emission tests in the environmental cabin were performed under Worldwide harmonized Light-duty rehicles Test Cycle (WLTC) at different ambient temperatures after the vehicles cold-started and hot-started. The gaseous pollutant...

The ground-attack UAV has been one of the most state-of-the-art unmanned equipments, which requires a high degree of autonomous capability. Autonomous capabilityis a typical operational ability of UAV. In view of the quantitative evaluation of autonomous capability forground-attack UAV, this paper p...

During the orbital operation of the satellite, the telemetry data is usually represented by multidimensional time series. The Gaussian Process Regression (GPR) model can provide dynamic thresholds for important telemetry parameters and timely discover failure symptoms hidden within the engineering t...

Aimed at economic and safety problems of investigating response characteristics of aircraft under wind disturbance by flight test, this paper presents a method of stimulating aircraft by designing input command of control surface in a calm atmosphere, to make it simulate motion response under wind d...

Based on public information, the model of THAAD-ER interceptor was established. Aimed at longer range, the high throw trajectory was planned, and a bunch of standard trajectories were produced. Predicted impact point iterated method is proposed, which contains solving time-to-go with analytic soluti...

According to embryonic electronic cell self-check demand, the residue code and berger code relationships between operands and results are analyzed based on basic logic and arithmetic operations. Aimed at address generator and I/O router, embryonic electronic cell equality operation is analyzed betwe...