41–60 of 326 hits
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    Effects of Asymmetries on the Dynamics of Motorized Momentum Exchange Tether and Payloads Injection Precision

    Free access
    Naiming Qi / Yong Yang / Jun Zhao et al. | DOAJ | 2015
    This paper presents the error dynamic model of motorized momentum exchange tether (MMET) based on the momentum exchange principle of space ...

    Numerical Simulation of Reactive Flows in Overexpanded Supersonic Nozzle with Film Cooling

    Free access
    Mohamed Sellam / Amer Chpoun | DOAJ | 2015
    , which in turn, leads to the appearance of strong side loads that may be detrimental to the rocket engine structural integrity. It is therefore ...

    ARMA Prediction of SBAS Ephemeris and Clock Corrections for Low Earth Orbiting Satellites

    Free access
    Jeongrae Kim / Mingyu Kim | DOAJ | 2015
    improve positioning accuracy in real time. The SBAS correction is only available within its service area, and the prediction of the SBAS ...

    Iterative Learning Control of a Nonlinear Aeroelastic System despite Gust Load

    Free access
    Xing-zhi Xu / Ya-kui Gao / Wei-guo Zhang | DOAJ | 2015
    The development of a control strategy appropriate for the suppression of aeroelastic vibration of a two-dimensional nonlinear wing section ...

    Dynamics of the Space Tug System with a Short Tether

    Free access
    Jiafu Liu / Naigang Cui / Fan Shen et al. | DOAJ | 2015
    The dynamics of the space tug system with a short tether similar to the ROGER system during deorbiting is presented. The kinematical ...

    Nonlinear Vibrations of FGM Cylindrical Panel with Simply Supported Edges in Air Flow

    Free access
    Y. X. Hao / W. Zhang / S. B. Li et al. | DOAJ | 2015
    Chaotic and periodic motions of an FGM cylindrical panel in hypersonic flow are investigated. The cylindrical panel is also subjected to in ...

    Projection-Based Adaptive Backstepping Control of a Transport Aircraft for Heavyweight Airdrop

    Free access
    Ri Liu / Xiuxia Sun / Wenhan Dong et al. | DOAJ | 2015
    complex nonlinear uncertainty of the aircraft-cargo model is factorized into a known matrix and an uncertainty function, and a projection-based ...

    Helicopter Vibratory Loads Alleviation through Combined Action of Trailing-Edge Flap and Variable-Stiffness Devices

    Free access
    Massimo Gennaretti / Giovanni Bernardini / Jacopo Serafini et al. | DOAJ | 2015
    The aim of this paper is the assessment of the capability of controllers based on the combined actuation of flaps and variable-stiffness ...

    Modeling of the Diffusion Bond for SPF/DB Titanium Hollow Structures

    Free access
    Xianghai Chai / Xiaoyun Zhang / Zhiqiang Wang et al. | DOAJ | 2015
    , while the optimal design of the hollow warren structure to improve its impact resistance, especially under bird-strike event, has been a ...

    Low-Thrust Transfer Design of Low-Observable Geostationary Earth Orbit Satellite

    Free access
    Bing Hua / Zhujun Shao | DOAJ | 2015
    feasible and results in reduced transfer time with a small amount of calculation. The method therefore offers a useful reference for low-thrust GEO ...

    Solution of Turbine Blade Cascade Flow Using an Improved Panel Method

    Free access
    Zong-qi Lei / Guo-zhu Liang | DOAJ | 2015
    combination of the panel method for infinite cascade, a deviation angle model, and a compressibility correction. The resulting solution provides a ...

    Decentralized State Estimation Algorithm of Centralized Equivalent Precision for Formation Flying Spacecrafts Based on Junction Tree

    Free access
    Mengyuan Dai / Hua Mu / Meiping Wu et al. | DOAJ | 2015
    As centralized state estimation algorithms for formation flying spacecraft would suffer from high computational burdens when the scale of ...

    Effect of Interfacial Debonding on the Strength of Composite Structure-Similarity Scale Model for the Wing-Box

    Free access
    Shiyong Sun / Rui Yang / Zibin Yan et al. | DOAJ | 2015
    Based on the wing-box structure, a model was established to analyze the strength of the scale model for the composite wing. Firstly ...

    LARES: A New Satellite Specifically Designed for Testing General Relativity

    Free access
    Antonio Paolozzi / Ignazio Ciufolini / Claudio Paris et al. | DOAJ | 2015
    real engineering challenge in terms of both manufacturing and testing. Data acquisition and processing are in progress. The paper will describe ...

    Perspectives for Sustainable Aviation Biofuels in Brazil

    Free access
    Luís A. B. Cortez / Francisco E. B. Nigro / Luiz A. H. Nogueira et al. | DOAJ | 2015
    The aviation industry has set ambitious goals to reduce carbon emissions in coming decades. The strategy involves the use of sustainable ...

    Load-Sharing Characteristics of Power-Split Transmission System Based on Deformation Compatibility and Loaded Tooth Contact Analysis

    Free access
    Hao Dong / Ling-ling Duan / Jun-an Zhang et al. | DOAJ | 2015
    loaded tooth contact analysis (LTCA) technique, the actual meshing process of each gear pair is simulated and the fitting curve of time-varying ...

    A New Adaptive Square-Root Unscented Kalman Filter for Nonlinear Systems with Additive Noise

    Free access
    Yong Zhou / Chao Zhang / Yufeng Zhang et al. | DOAJ | 2015
    Maybeck’s estimator is modified and extended to nonlinear systems. The square root of the process noise covariance matrix Q or that of the ...

    The Simultaneous Interpolation of Target Radar Cross Section in Both the Spatial and Frequency Domains by Means of Legendre Wavelets Model-Based Parameter Estimation

    Free access
    Yongqiang Yang / Yunpeng Ma / Lifeng Wang | DOAJ | 2015
    frequency and spatial points. Numerical results are provided to demonstrate the validity and applicability of the new technique. ...

    An Approximate Optimal Maximum Range Guidance Scheme for Subsonic Unpowered Gliding Vehicles

    Free access
    Dao-Chi Zhang / Qun-Li Xia / Qiu-Qiu Wen et al. | DOAJ | 2015
    This study investigates the maximum gliding range problems of subsonic unpowered gliding vehicles and proposes an approximate optimal ...

    Autopilot Design Method for the Blended Missile Based on Model Predictive Control

    Free access
    Baoqing Yang / Yuyu Zhao | DOAJ | 2015
    nonlinear model of blended missiles is reduced into a piecewise affine (PWA) model according to the aerodynamics properties. Secondly, based on the ...