For the spacecraft attitude control problem in the presence of disturbance torques, a passivity control scheme based on port-controlled Hamiltonian (PCH) system model was proposed from the perspective of energy. By writing the attitude control system in a PCH form and adding the state related to int...

The multi-rotor unmanned aerial vehicle (UAV) is one of the popular configurations in the UAV industry for small UAVs. However, research on the modeling of multi-rotor vehicles and its characteristics regarding flight mechanics is still limited. A flight mechanics model for multi-rotor UAV is develo...

The traditional test verification of structural reliability is generally based on the independence assumption between loading stress and structural strength. Stating with the correlation analysis of stress and strength, we propose a hardened test method of structural reliability verification based o...

To analyze the difference between external store separation and buried store separation, several separation cases were simulated using the same missile under the conditions of both subsonic and supersonic inflow. Improved delayed detached eddy simulation (IDDES) method based on Menter SST turbulence...

Active flutter suppression (AFS) is a worldwide well proposed solution for the flutter of aircraft, which plays an important role in modern aircraft design. Many studies have shed some light on the AFS usage of sliding mode control strategy and the sliding mode observer, acting on two-dimensional wi...

Aimed at the problem that the quality of the images acquired by unmanned aerial vehicle (UAV) is easily reduced due to the fog or haze weather, a haze removal algorithm for UAV images based on robust estimation of atmospheric light was proposed. The proposed algorithm selects image patches with diff...

In order to solve the problems for embryonics array that online fault detection is difficult to be designed, detection rate is low, and detection rate is difficult to be accurately calculated, an online fault detection method based on dual modular redundancy and a fault detection rate analysis metho...

To deal with the problem of the refined tracking of steady groups in partly resolvable condition, a refined tracking algorithm based on iterative closest point (ICP) is proposed in this paper. First, the ICP algorithm is used in tracking association, and by using closest point cyclic iteration, the ...

In this paper, a method of adaptive neural network backstepping fault-tolerant control, based on barrier Lyapunov function, is proposed for anti-skid braking system in the presence of slip-ratio constraint, control input saturation and partial loss of actuator effectiveness. The neural network can m...

Aimed at solving the failure problem of the maximum power point tracking (MPPT) algorithm caused by partially shaded condition in the photovoltaic power generation system, a global maximum power point tracking (GMPPT) algorithm based on δ-potential well is proposed. Based on the photovoltaic multi-p...

Laser bending of preloaded metal plate is a relatively new bending method and its process parameters are researched in this paper. A finite element model of the forming process was established based on software ABAQUS, and its reliability was verified by test. Then, finite element simulations using ...

In recent years, the domestic and international earthquake disaster has caused huge losses to human life and property. Massive earthquake disaster information on the Internet can provide the basis for decision support for emergency response and timely rescue, so there is an urgent need for efficient...

Tetrahedron formation has an important application in the space physical three-dimensional collaborative detection. Formation keeping control must be carried out to guarantee the detecting efficiency. However, the in-track coupling effect of cross-track maneuver can cause the drift along the in-trac...

Hypervelocity flow is the high-speed high-temperature flow environment that space vehicles or capsules face when they reenter the atmospheric layer. An expansion tube is one of the few qualified test facilities on the ground to simulate it. Numerical simulation is presented as a powerful assistant t...

An improved searching method of alternating digital tree (ADT) is proposed for making up the deficiency of the existing ADT method and improving the efficiency of the overlapping grid assembly. The new method stores and retrieves donor cells based on a hash data structure, in which an auxiliary Cart...

An angular momentum equalization control method was proposed for redundant space robot with scissored-pair control moment gyroscopes (CMGs) for joint actuation. This method utilizes the space robot's extra degrees of freedom to equalize momentum usage among arm links, thus achieving CMGs' simultaneo...

The reliability sensitivity index well analyzes how the failure probability of a model is affected by the different sources of uncertainty in the model inputs. In order to improve the efficiency of digital simulation in estimating this index, a method was proposed based on the weighted density, the ...

According to the principle of near infrared spectrum (NIR), an optimized extreme learning machine algorithm with particle swarm optimization (PSO-ELM) was proposed and used in ammonia concentration quantitative analysis of small sample. By optimizing the hidden node parameters of extreme learning ma...

Aimed at the problem that signal radar extracts parameters difficultly and has higher error in estimating parameters due to coupling of precession cone target parameters, a novel algorithm based on uniting the multi-aspect micro-motion information is proposed for parameter extraction and fusion. Fir...

Concerning the specific demands for solving problems of the long-term conjugate heat transfer (CHT) problem at the kilosecond level, a new loosely coupled algorithm of the global tightly transient coupled heat transfer based on the quasi-steady flow field is put forward. The flow field is updated al...

To improve the positioning accuracy and stability of an intraocular surgery robot which has a remote center of motion (RCM) mechanism, the coordinate system of the robot is established. Based on the equivalent system model, the instantaneous centroid position of model components is analyzed. The dyn...

In calculating the sparse principal components (PCs), attaining k PCs simultaneously can reduce the accumulated error arising from the calculation process. We proposed the sparse principal component model via regularized rank-k matrix approximation and designed a block coordinate descent method (BCD...

The effect of signal error on carrier landing during radar navigation was analyzed based on the automatic carrier landing system (ACLS) of natural carrier-based aircraft and the commissioned main guiding way of radar navigation in carrier landing. According to the components and the functions of the...

Horizontal-advanced receiver autonomous integrity monitoring (H-ARAIM) is a new type of airborne autonomous satellite navigation integrity monitoring technology developed in the United States and Europe. In view of performance based navigation (PBN) and automatic dependent surveillance-broadcast (AD...

The GO-FLOW methodology is applied in the reliability analysis of aircraft electro-hydrostatic actuator (EHA). Firstly, based on the reasonable division of unit function, GO-FLOW reliability analysis model of EHA was established. In order to solve the difficult problem that GO-FLOW chart cannot cont...

Piezoelectric ceramic vibration energy harvester has attracted great attention for its simple structure, environment protection, easy miniaturization and other advantages. According to piezoelectric effect, a double-coupled distributed parameter model was established using mode method by combination...

A large amount of heat inside the lithium battery must be dissipated to ensure the safety of the battery by using high efficiency thermal management system (TMS) at high charging/discharging rates. A newly designed TMS integrating phase change material with air cooling was designed and its temperatu...