To deal with the terminal guidance problem of missiles for intercepting maneuvering targets, a nonsingular fixed-time convergent fast terminal sliding mode guidance law is developed with impact angle constraints. Compared with finite-time convergent terminal sliding mode guidance laws, the proposed ...

Using turbocharging technology dramatically increases the complexity of piston engine systems and the safety issues associated with turbocharger are becoming urgent. A typical two-stage turbo supercharged piston engine is considered and the judgment method for failure of incentives is focused in thi...

The high-precision filter estimation is a key technology in the SINS/GNSS integrated navigation system, and its estimation accuracy has direct influence on the accuracy of navigation. The traditional filter estimation method is based on inertial navigation error model, and does not take its uncertai...

Ice accretion on the wings can affect the operational characteristics and flight performance of the aircraft, posing a hazard to flight safety. Based on the experimental data, the typical ice shapes with different icing severity on the leading edge of wings are constructed. The high-precision numeri...

Land surfaces of an hourglass worm wheel hob needs to be controlled within a range to ensure the strength and sharpness of cutting edges. Circumference positioning errors lead to the changes of the land width. In order to grind out the required land surfaces, this paper studies the influence of the ...

To solve the problem of multisource heterogeneous data fusion in commercial aircraft engine post-repairing exhaust gas temperature margin prediction, a combined method of convolutional auto-encoder and extreme gradient boost model was proposed. This method uses the proposed cross entropy increasing ...

The monitoring method for the dynamic growth of cracks, which is based on the moment-tensor theory, utilizes the acoustic-emission signal of crack opening to obtain the information of cracks. The pore in media has an effect on the accuracy of monitoring results. The two-dimensional plane strain fini...

In order to achieve efficient and accurate thermal conduction analysis of three-dimensional lattice, based on the principle of thermodynamics, the equivalent heat conduction formula of lattice structure is deduced, and the modeling method of the equivalent heat conduction analysis model is proposed....

Aimed at slow response and high-power consumption of high-speed on/off valve (HSV) controlled by single PWM signal, a compound PWM control strategy proposed from the point of view of the digital signal generation mechanism, which consists of reference PWM, excitation PWM, high-frequency PWM and reve...

Experimental research of single-event-transient (SET) is carried out by means of pulse laser and heavy ion irradiation on the inverter chain fabricated by 130 nm bulk silicon process. The impacts of laser energy, heavy ion linear energy transfer (LET), and PMOS gate length on the characteristics of ...

To actualize the requirement of friction stir welding for light metal materials in aerospace manufacturing, this paper proposed a novel 2UPR-RRU parallel mechanism with IT2R 3-DOF as the manipulator of the welding equipment. Based on screw theory, the mechanism of one translational and two rotationa...

In view of several problems of electrical wiring interconnection system (EWIS), such as condition difference, ageing phenomenon and modelling difficulty, a UGF-GO methodology based EWIS degradation reliability analysis method is proposed by combining traditional GO methodology and universal generati...

For decreasing the drag and lowering the energy consumption for the hybrid laminar flow design correctly, the optimization system, whose object can be set as minimum energy cost, is built by correlating the relationship of suction control power consumption and drag. The optimization system includes ...

This paper aims to investigate the failure mechanics of complex joints and evaluate the crack initiate and growth lifetimes of complex joints. Fatigue tests were respectively carried out on double-lap and double-lug joints, failure modes and mechanisms were investigated through scanning electron mic...

For the assessment of stealth aircraft susceptibiliiy under the influence of multiple factors, the combined analysis of the factors in typical combat scenarios is conducted. Firstly, the susceptibility model based on task cycle is established. Secondly, the susceptibility parameters such as radar, i...

When sheet metal is forming, it usually bears complex loads. However, uniaxial tension test is usually used to obtain material properties, because the material only bears unidirectional load when deforming, which is far from the actual situation. In order to obtain more real material properties unde...

For finding how the gravity affects the liquid on the rotating disc, the liquid morphology at the edge of the vertical rotating disc was experimentally studied by high-speed photography. The results show that there are three liquid morphologies at the edge of the vertical rotating disc:column, film ...

The cryogenic loop heat pipe is an efficient deep-hypothermic two-phase heat transfer device, which will be widely applied to cryogenic thermal control system for space projects such as infrared detection in the future. Zirconia is used to develop nitrogenous flat evaporator loop heat pipe for capil...

With the recent social and economic development and the expansion of urban size, the demand for urban transportation has increased substantially, that introducing large amount of bikes and electronically-driven bikes and the traditional non-motor bike and motor vehicle operation conflict is signific...

In view of the shortcomings of the manual operation methods commonly used in the docking of spacecraft cabins, such as low efficiency, poor precision, and difficulty in ensuring reliability, an automatic docking device for cabins based on multi-sensor measurement has been developed. The measurement ...

In order to improve the real time performance of the nonlinear model predictive control (MPC) for aero-engine, an alternating direction method of multipliers (ADMM) was applied to the receding horizon optimization of MPC. The predictive equation was constructed based on the state space model. The au...

At present, the study of soil moisture inversion in the field of global navigation satellite signal-interferometer and reflectometry (GNSS-IR) is only for single frequency deployment. In the paper, we propose a method that uses the entropy method to fuse two frequency to improve the accuracy of soil...

In the UAV parachute recovery process, the UAV and parachute are always in real-time dynamic balance state, and the coupling relationship between the two in the parachute recovery process is very complicated, so it is difficult to establish accurate dynamics model of UAV parachute recovery. For solv...

In order to meet the requirement of multi-input and multi-output of broadband wireless communication system, a new path-sharing true-time-delay beamformer architecture is proposed in this paper. The output capability is improved by synthesizing multiple signals, compensating the time difference in r...