Catenary problem is a kind of classical and changeable mechanical problem, whose curve configuration guides the structural design of engineering applications such as bridge. In order to obtain the deformation of catenary with different structural or load characteristics, a general method based on tr...

The problems of using GPS-Reflectometry (GPS-R) measured data to establish satellite-borne sea surface height inversion model are studied and its validity is verified. The data of TechDemoSat-1 (TDS-1) and the retrieval technique of Delay-Doppler Map (DDM) were used to analyze the errors in the retr...

A model of Double Generator Deep Convolutional Generative Adversarial Network (DGDCGAN), which uses the incomplete or noisy sample image as the training set, is proposed, in order to solve the problem of serious distortion of large area image inpainting, complete and high-quality training samples ar...

In order to improve the calibration efficiency of Micro-Electro-Mechanical System (MEMS) accelerometers and reduce the dependence on high-precision turntables, a MEMS accelerometer calibration method based on Improved Fruit Fly Optimization Algorithm (IFOA) without turntables is proposed. The method...

Abnormal hand behavior detection during operation based on intelligent video surveillance systems can prevent human errors and improve human reliability. In order to solve the problems that the motion characteristics of hand operation are not obvious, and common abnormal detection and gesture recogn...

In active control of flutter, time delays are inevitably introduced and have significant influence on the stability of the closed-loop controlled aeroelastic system. At present, study on the flutter suppression has been focused on subsonic and supersonic regimes, where aerodynamic forces are modeled...

Aimed at range optimization requirements of vehicle with ramjet, an evaluation method based on the vehicle-ramjet performance factor is proposed. Performance prediction model and optimization design process of ducted rocket are developed. These provide support for the integrated optimization design ...

Satellite Based Augmentation Systems (SBAS) provide SBAS messages through GEO satellites to improve the performance of GNSS in order to meet the navigation needs of civil aviation users, and reasonable and effective message content and broadcast schedule design are important for SBAS to achieve high...

The multiexposure imaging method can be utilized to improve the attitude update rate of the star tracker effectively. However, with the increase of the angular velocity and angular acceleration, the cross probability of adjacent star tracks increases significantly, thus seriously affecting the perfo...

At present, a large number of high-fill projects are used in mountainous airports, and the settlement and deformation of high-fill subgrades is an important issue to be solved. In this paper, based on the Unified Hardening (UH) model, by studying relationships between the stone content and the inter...

The Weibull distribution plays a very important role in statistics in fatigue, but the Weibull distribution of the three parameters is more complicated in mathematical form. The three parameters can be estimated through sample data. One is the "Weibull probability paper", but this method is inconven...

The prediction accuracy of upper wind has an important impact on the flight safety of launch vehicle, which is mainly manifested in the impact on the accuracy of the maximum aerodynamic load. Based on wind field from sounding data in a region, the influence of wind deviation caused by upper wind for...

Since it is difficult, costly, and time-consuming to test the power electronic converter of Brushless DC Motor (BLDCM) in all operating conditions with a motor-load test bench, this paper proposes a four-quadrant Power Hardware-In-the-Loop (PHIL) BLDCM emulator, which submits a methods of sampling a...

Aimed at the large error when using Increment Capacity Analysis (ICA) to estimate the State of Health (SOH) of satellites battery, this paper proposes an advanced SOH estimation method based on Smooth and Discharge applicative Increment Capacity Analysis (SD-ICA). First, the proposed method does the...

The Carrier-to-Noise Ratio (CNR) of Global Navigation Satellite System (GNSS) signals is an important parameter to describe GNSS receiver's performance. In this paper, we derive and analyze two commonly used GNSS signal CNR estimation methods: Variance Summing Method (VSM) and Power Ratio Method (PR...

In order to clarify the interference and damage effects of ultra-wideband electromagnetic pulse on fuze, the threshold interval of fuze-electromagnetic pulse coupling effect is determined. It is difficult to accurately assess the anti-interference ability of fuze in the electromagnetic pulse environ...

In order to predict whether there is relative sliding in the circumferential direction between the seal ring and the outer rotor in air film seal between shafts, a method for determining the circumferential sliding of air film seal between shafts considering centrifugal expansion effect is proposed....

In order to quickly calculate and analyze the experimental data under the action of turbulence field, which are measured by video measurement method in high-speed wind tunnel test density projection field, and aimed at the numerical solution of density projection field, the second-order partial diff...

For achieving the thermal flutter exact solutions of two-dimensional functionally graded panel and revealing the mechanism of the thermal flutter, based on the classical thin plate theory and the first-order piston theory, the characteristic governing differential equation of two-dimensional functio...

Focusing on the problem that multiple hypersonic vehicles in the dive phase attack a stationary target or a slowly moving target, a cooperative guidance law with Line-of-Sight (LOS) elevation and LOS azimuth constraint is designed based on finite-time theory. Firstly, the guidance process of the div...

To study the intrinsic relation between the aerodynamic noise of tandem double cylinders and the large-scale vortex shedding behavior, we carry out large eddy simulations combined with the K-FWH equation. Firstly, the high-fidelity of the numerical treatment is verified by a comparison with the corr...

Load spectrum variation matters to fatigue reliability service life of a fleet. For transport aircraft, gust load is one of the critical damage sources. To study the damage variation of gust load spectra, two parts have been investigated. In the first process, gust velocity exceedance measured in se...

In view of the high coupling of the effects of jet parameters and angle of attack on the aerodynamic characteristics of airfoils in current circulation control technology, the accuracy of the corresponding unsteady aerodynamic models is poor. Based on the numerical simulation data of forced pitching...

An improved ORB feature matching algorithm is proposed to solve the problem of decreasing matching accuracy under the conditions of image blur, light change, image compression and noise. First, in the process of extracting feature points, the image is meshed and quad-tree structure is introduced to ...