With the robot gradually used in many fields of production and life, safety has become one of the important research directions of robot. According to different research objects for robot safety, research status of robot safety at home and abroad is expounded from two parts, namely self-safety and i...

When radar is used to track the maneuvering target under speed deception interference, there are many problems such as many false trajectories, hard discrimination of true-false target, and real target tracking instability. In view of these problems, this paper puts forward the speed interference id...

The engine variable stator vane (VSV) regulation law is extremely complex, and through mining quick access recorder (QAR) data, the VSV regulation law is studied. Firstly, the support vector regre-ssion (SVR) model based on particle swarm optimization (PSO) is established through the QAR data of PW4...

To achieve high precision attitude control for the pico- and nano-satellite at low cost, this paper presents a coordinated control method of double actuators using flywheel and solid propellant microthruster (SPM) array. The global fast terminal sliding mode controller is adopted to solve the rapid ...

Ram air turbine (RAT) is a part of the emergency energy system in plane. It can extract energy from airflow through rotating turbine. Design of turbine blade and study on aerodynamic performance are the key for utilizing airflow energy efficiently. Aimed at the power needed by some type of emergency...

Acoustic emission (AE) technique is a non-destructive damage test method. It can be used to monitor the dynamic defects of composite structures in aircraft. The complex components of AE signal and the anisotropy of composite materials lead to the low positioning accuracy of the source. A method of t...

Air traffic controllers' fatigue has become a major hazard to affect civil aviation safety, and accurate detection of fatigue is an important means for fatigue warning and fatigue risk reduction. In order to study whether the pupil diameter can detect air traffic controllers' fatigue effectively, an...

In order to study the variation of the performance parameters of a hypersonic air inlet with the flight height, free stream turbulence intensity and free stream Mach number, and the influence of the boundary layer transition on the compression surface on air inlet performance, a series of numerical ...

Moving towards the development of more electric aircraft, advanced electromechanical actuation system (EMA) is developed for aircraft control surface as one of new technologies. The failure mode and failure effect of EMA are the focus of airworthiness review. In order to solve the problem of uncerta...

In order to meet the requirement of milimeter-scale micro turbine engine performance design, a numerical model was presented to evaluate the performance of millimeter-scale micro gas turbine engines. In this model, new turbomachinery characteristic maps were applied, which took both low Reynolds num...

Based on the attention-situation awareness (A-SA) model and the attention resource allocation situation awareness model, a new quantitative model of situation awareness was put forward, which considers the multi-resource load and information recognition theory. In this model, the multi-resource load...

In order to improve channel estimation performance, the pilot design problem in orthogonal frequency division multiplexing(OFDM) is investigated from the perspective of compressed sensing(CS).Since the reconstruction performance of the sampling matrix cannot be accurately measured by the existing me...

The hardware in the loop simulation system of geomagnetic navigation is the key link of geomagnetic navigation from theory to engineering application. At the present stage, the real-time performance is one of the key technologies that restrict its development. To solve this problem, the delay effect...

Aimed at random occurrence of singular value in the process of ultra wide band (UWB) ranging, the traditional Mahalanobis distance detection algorithm is improved, and the Mahalanobis distance singular value detection module based on minimum covariance is designed. Based on the omnidirectional robot...

Active sensors obtain the target continuous measurements that can be intercepted by enemy system. To reduce the interception risk, a scheduling algorithm for multi-sensor collaboration tracking and radiation control is proposed. Firstly, the sensor radiation is represented by the emission level impa...

A new maglev low-frequency vibration sensor was proposed, which was used for multi-axis measurement of aerospace micro-vibration. It used micro-spring and the hybrid structure with electromagnets and permanent magnets as the supporting element. The axial displacement detection circuit and the photoe...

There are 11 parameters in the form of domestic integrated modeling of ballistic limit equations. Theoretically, the exhaustion method can be used to obtain the numerical value, but the computation time is too long and the storage space is huge, so it is not suitable to realize. To solve this proble...

In the application of global navigation satellite system (GNSS) in high-orbit environment, satellite signal propagation link is complex with large attenuation and non-uniform intensity distribution. These signal link characteristics influence theoretical analysis and engineering application. In orde...

The electric field data observed by DEMETER satellite in the space above China from 2008 to 2010 were analyzed, and 328 magnetospheric line radiation (MLR) events were detected. According to the spectrum of the existing MLR events, the characteristics and their possible cause of these MLR events wer...

Brushless DC(BLDC) motor is widely used and its temperature degradation process is multistage. It is necessary to establish a multistage degradation model. When the model has several parameters, the parameter estimation process is sensitive to the initial value and easy to end up with a local optimi...

A major problem in designing automotive structures is how to make full use of the flexible designability of composites and light weight of polymer matrix, and also consider the close connection among the material, structure and properties. Since the helical spring is one of the major load-bearing pa...

The flexural behavior of scarf repaired honeycomb sandwich structures was investigated via experiments and finite element analysis. A three-point bending test was carried out on both undamaged and repaired specimens. Test results demonstrate that the failure mode is core shearing, and that the flexu...

2D Euler equations were used for the numerical simulation of the influence of temperature disturbance on oblique detonation waves (ODW) in an oblique detonation combustion chamber. Instantaneous variation of temperature was introduced from the inlet as the disturbance by increasing and decreasing 10...

To impove the management of bird-strike avoidance at airport and realize the linkage of avian radar with multiple bird-repelling devices, an intelligent decision making method was proposed for airport bird-repelling based on support vector machine (SVM). The method includes two steps of training and...

An important part of the scattering of stealth aircraft is slit scattering. Though researches have done on it, none of them has produced results in small angular domain (from -30° to 30°). This paper applied the carrier scattering method based on superposition principle to electromagnetic scattering...

Since the terrain contour matching (TERCOM) algorithm is easy to mismatch due to measurement error and terrain self-similarity, an on-line false matching judgement criterion based on the joint probability of multiple reference points in a correlation plane was proposed by taking mean square differen...