Aimed at the problem of modern air combat maneuver decision-making, an air combat maneuver decision-making method based on improved symbiotic organisms search (SOS) algorithm is proposed. Firstly, the shortcomings of the traditional basic maneuver inventory are analyzed, improved and expanded, and 1...

The power turbine rotor of aero turbojet engine and turboprop engine is a typical high-speed flexible rotor structural system with multi-support, connecting interface and uneven mass/stiffness distribution. The dispersity of mechanical characteristics of joint structure and bearing stiffness can cau...

Shear stability test was carried out on the dual beam laser welding stiffened panel with cover. The buckling load, buckling form, post-buckling carrying capacity and failure modes of the stiffened panel with cover under shear loading were analyzed. A finite element method was utilized to model the s...

In order to meet the requirements of high stiffness and accuracy of the position and posture adjusting mechanism in the assembly process of spacecraft shell, a novel 5-U(RRP)S/(8U)PU parallel mechanism with closed-loop limbs, which are improved from conventional limb structure, is proposed and analy...

For the problem of texture image denoising, by analyzing the advantages and disadvantages of the total variation (TV) denoising model and the directional total variation (DTV) denoising model, we propose a robust denoising model based on directional total variation. In the proposed model, in order ...

Based on the collision-radiation (CR) model of nitrogen, the distribution of the electronic energy levels of N₂ and N₂⁺ molecules in the hypersonic flow shock wave with velocity 6.2 km/s and initial pressure 133 Pa is calculated. The effects of different excitation and transition rate models on the ...

With the popularity and widespread application of high-power light-emitting diode (LED) in lighting industry, its reliability has gradually become one of research focuses.The failure of gold bonding wires in the traditional LED package has been a critical bottleneck that restricts its reliability. I...

In order to improve the precision of soil moisture measurement in a wide range, in this paper, the global navigation satellite system interferometry and reflectometry (GNSS-IR) for soil moisture was studied and a soil moisture inversion model based on support vector machine (SVM) was proposed. In th...

Humans are usually subjected to acceleration with fast changing directions and magnitude in ordinary or some special situations. Previous studies have found that acceleration had physiological and path-ological influence on cardiovascular system. However, more in-depth investigations need to be done...

Aimed at the high incidence of neck pain caused by large blocking load in the process of arrest deck-landing the aircraft carrier, the biomechanical response of pilots under the condition of continuous overload is studied by the finite element method. Based on CT scanning images, Mimics was used to ...

Aimed at the problem of rapid calculation of firing data of guided rocket launcher, a new method for calculating firing data based on large sample data and surrogate model is proposed. The surrogate models are used to establish the functional relations between the firing angle, uncontrolled lateral ...

Based on the analysis of the relationships between the physical fields that the in-wheel motor is involved in, an integrated design method for fault-tolerant permanent magnet in-wheel motor is proposed, aiming at solving the problems of complex working conditions and serious heat of the in-wheel mot...

Aimed at the problem of small fault detection for actuator of satellite attitude control system, a small fault detection method based on neural network disturbance observer is proposed. By using the redundant relationship in the satellite attitude control system, a gyro disturbance observer and dist...

For the morphing process control of morphing aircraft, by combining the switching system theory and the multivariable adaptive control theory, a robust adaptive controller design method based on the switched system is proposed in this paper. Frist, the longitudinal short-period linear switching mode...

In order to better study the hover dynamics characteristics of small-scale unmanned helicopter, the in-depth dynamics model analysis of linear system identification and nonlinear modeling was conducted in this paper on an 8.1 kg electric helicopter with 3-axis gyro augmentation. In the linear system...

In order to meet the requirements of relative motion control for spacecraft formation flying missions, design and control of spacecraft's forced fly-around formation under the control of piecewise constant thrust are investigated. For teardrop hovering configuration under pulse control, a multi-leve...

Taxiway is the main resource for airport operation, connecting the runway and apron. The specific traffic flow characteristic emerges with the increase of aircraft at the taxiway. The taxiway traffic flow cell transmission model is established by combining cell transmission model (CTM) and operation...

To improve the slow and small target detection performance of current interferometric SAR (INSAR), a new method is explored to implement constant false alarm rate (CFAR) detection for full polarimetric along-track INSAR (AT-POLINSAR). First, by designing a single-baseline AT-POLINSAR, we point out i...

The influence of the heat flow generated in the laser tube on the inherent characteristics of the structure is one of the key research issues in the design of narrow linewidth semiconductor lasers. Based on the mechanical properties and temperature load requirements, this paper aims at maximizing th...

The control algorithm for the target tracking problem cannot be well adapted to the problem of large-scale maneuver flight or even game with us. This paper proposes a control algorithm for target tracking using approximate dynamic programming. The game algorithm is used to train our UAV to form an e...

For the flight safety of icing aircraft, the nonlinear icing effect model was built based on the linear icing effect model, and then the nonlinear longitudinal dynamics model of icing aircraft was established. Through the combination of feedback linearization and fuzzy control theory, the reconfigur...

To deal with the problem of missile for attacking ground maneuvering target in 3D space, a 3D finite-time guidance law with impact angle constraints is proposed. In order to improve convergence speed and suppress chattering problem, the nonsingular fast terminal second-order sliding mode control bas...

High-resolution turbulence simulations were performed for an X-51A-like aircraft model to investigate its complex unsteady separation flow caused by high angle of attack conditions. The calculation is based on delayed detached-eddy simulation (DDES) methodology under high order. Flow Mach number is ...

The tensile test of the countersunk bolted composite material/metal joint with sleeve was carried out, load-displacement curve and out-of-plane deformation of the joint were measured, and the tensile behavior of the joint was analyzed. A finite element model of the joint was established by using ABA...