To solve the problem of maneuvering decision in the autonomous air combat of unmanned combat aerial vehicle, the existing research achievements are analyzed and a maneuvering decision model that combines optimization idea with machine learning is proposed. The multi-objective optimization method is ...

In order to improve fuel economy and reduce emissions on the urban road, a speed control method in successive signalized intersections was proposed for autonomous vehicles to interact with the roadside facilities and the regional center control system under the connected vehicles environment. The pr...

Aimed at the research status of the shock thrust vector control, which is limited to the mainstream and secondary flow gas as the same gas, the influence of different secondary flow gas molecular mass on thrust vector performance is investigated. First, a turbulence model described by two equations ...

Aimed at the influence of train vibration and environmental noise on the measurement of track wear, we proposed a method for automatic extraction of small circular arc of the rail waist, and achieved the high-precision registration of rail profile. First, a polynomial fitting method based on truncat...

To reduce the tip leakage and flow loss of gas turbine, the new method of pneumatic seal combined with tip structure modification was put forward based on flow reorganization. Three typical combination schemes of tip groove and spontaneous tip injection were investigated by model test and numerical ...

In order to study the application of heart rate variability (HRV) indexes in the fatigue detection of the air traffic controllers (ATC), the simulation control experiment platform was set up, the real-time physiological recorder was used to record the electrocardiogram (ECG) signals of 20 subjects i...

The modeling, simulation and analysis of target features are of great significance for synthetic aperture radar (SAR) image-based automatic recognition (ATR) systems. The electromagnetic scattering calculation and radar imaging simulation of the surface ship target are studied. Based on the method o...

In the nominal model of the manipulator trajectory tracking controller constructed by Udwadia-Kalaba equation, the initial conditions are difficult to satisfy the constraint equations, and the constraint violation is generated by the accumulation of errors in the process of numerical solution, which...

Hardness is one of the important indexes of mechanical performance of materials, and employing ultrasonic nondestructive testing method for hardness evaluation faces many challenges now. In this paper, through setting up high-precision ultrasonic wave transmission time measurement system, the longit...

Magnetically suspended control and sensing gyroscope (MSCSG) is a kind of new-concept gyro, which takes Lorentz force magnetic bearing as torquer to drive the rotor to tilt in radial direction. As there is dynamic unbalance in the magnetically suspended rotor system because of the uneven mass distri...

As a man-made pollutant to the ionospheric electromagnetic environment, power line harmonic radiation (PLHR) is widely known in these years. It is urgent to conduct research of the influence of PLHR on ionospheric state parameter variation. Based on the observed data of instrument for detection of p...

To overcome the influence of launching process and on-orbit extreme temperature environment on the tool pose accuracy of a space manipulator, a space manipulator kinematics on-orbit self-calibration method based on product of exponentials (POE) formula was presented. Using the binocular space camera...

Transporting a cable-suspended payload with two quadrotor unmanned aerial vehicles (UAVs) involves controlling two quadrotor UAVs cooperatively. The existing methods formulate the problem into a control system with only one cost function. In this paper, in order to exploit their individual interest,...

Electromagnetic tracking system (EM) is widely used in various environments needing tracking or positioning, due to its high accuracy, flexible reaction, simple operation, cheap price and insensitivity to blocks. In vascular interventional surgery, EM performs well in clinical environment with inacc...

To deal with the insufficient capability of the existing airport ground movement disruption recovery approaches in handling some major kinds of disruptive events such as the deviation from the planned route and the closure of a taxiway and the lack of optimisation criteria in taxiing trajectory adju...

The high temperature gas after shock wave occurs to ionize in hypersonic flight, which makes the aerodynamic thermal environments to be complicated. The 5 species (N₂, O₂, NO, O, N), 7 species (N₂, O₂, NO, O, N, NO⁺, e^-) and 11 species (N₂, O₂, NO, O, N, N₂⁺, O₂⁺, NO⁺, O⁺, N⁺, e^-) thermo-chemical re...

In order to improve the accuracy of micro-electro-mechanical system (MEMS) gyro, an optimal bounding ellipsoid (OBE) algorithm based on relaxed Chebyshev center (RCC) is proposed and used to fuse gyro array signals. On the basis of the error model of single gyro, the maneuvering fusion model of the ...

Aimed at the reliability evaluation problem of liquid propellant tank under uncertain conditions, the reliability evaluation method of tank stress strength is established based on tank stress strength and interval convex model theory. Firstly, the stress distribution of propellant tank is analyzed a...

The time-triggered Ethernet (TTE) static scheduling table is generated based on the satisfiability modulo theories (SMT). If the time-triggered (TT) traffic set is of a large scale, the subsets of traffic need to be selected in batches into the incremental scheduling table generation, where the orde...

To comprehensively investigate the safety performance of carrier-based aircraft (CBA) catapult takeoff process, a multi-body coupled dynamics model was established in absolute coordinate system with the natural coordinate method. Based on the simulation curves of catapult launch, the influence of di...

The design of the transposition scheme of inertial measurement unit (IMU) has an important influence on the rapid calibration of strapdown inertial navigation system (SINS). In the traditional transposition scheme, both the rotating shaft and the sensitive axis are reclosed, and only two sensitive a...

Low level swept field (LLSF) testing is an important part of aircraft-level high intensity radiated field (HIRF) effect measurements. The simulation model and experimental systems of LLSF effect for cuboid-shaped cabin with mechanical mode stirrer placed internally were established. Encouraging nume...

For multi-thread hourglass worm gear hobs, spiral flutes are typically used to reduce the absolute value of the negative rake angle and to equalize the rake angles on the left and right sides of each tooth, which will improve the cutting performance of the hob. Because of the different spiral angle ...

In this paper, the body bias circuit in 28 nm bulk and the back bias circuit in 22 nm FDSOI are analyzed and compared from two aspects:power consumption and circuit performance. Taking a 65-stage ring oscillator (RO) with 4-level frequency divider as an example, post simulation was conducted. The si...

With the rapid development of air transport industry, the growing demands of air traffic put forward higher requirements for airport operation efficiency. To improve the surface efficiency, a bi-level programming model with taxiing scheduling model as upper model and gate re-assignment model as lowe...

Odometry is widely applied for continuously obtaining system poses in automatic drive system and robot navigation system. Visual odometry can achieve high precision of target motion trajectory estimation with low cost, while feature-based visual odometry has the advantages of low time complexity and...

Magnetic anomaly detection is a widely used approach to detect ferromagnetic objects, which is mainly based on the spatial distribution of magnetic anomaly field. The spatial magnetic field model of rectangular ferromagnetic object is derived. The spatial distribution of the magnetic anomaly field i...