Searched for: faculty%3A%22Aerospace%255C%252BEngineering%22
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Zhang, Q. (author)
During the launching vehicles design and their optimization process, the implementing of aerodynamic characteristics (AC) database is quite important. Accuracy of such database determines quality of the pre-flight simulation, trajectory and even the whole design direction. However, the database building process is one of the most challenging...
master thesis 2017
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Zhang, D. (author)
Sandwich composite is commonly used as a material of wind turbine blades. In order to meet the practical needs, the design of sandwich always contains some designed-in imperfections, like ply drop of facing laminates, core with resin grid and so on. These unavoidable designed-in imperfections may induce delamination problems and result in huge...
master thesis 2016
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Zhang, Y. (author)
Based on the recently developed mimetic spectral element method, we propose an effective numerical scheme for solving three-dimensional periodic incompressible Euler flows, which spatially preserves mass, kinetic energy and helicity. Preserving multiple integral invariants numerically will significantly contribute to the stability and accuracy...
master thesis 2016
document
Zhang, X. (author)
Air traffic noise, especially during the aircraft take-off and landing, has been universally acknowledged as a nuisance, for which reason, the International Civil Aviation Organization(ICAO) has ratified articles and established specifications aiming at the attenuation of air traffic noise, such as the Annex 16. The implementation of large...
master thesis 2016
document
Van der Zwaag, S. (author), Zhang, S. (author), Fang, H. (author), Bruck, E. (author), Van Dijk, N.H. (author)
We report the main findings of our work on the behaviour of binary Fe-Cu and Fe-Au model alloys designed to explore routes to create new creep resistant steels having an in-built ability to autonomously fill creep induced porosity at grain boundaries. The alloying elements were selected on the basis of their ability to be brought in...
conference paper 2016
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Liang, K. (author), Zhang, Y. (author), Sun, Q. (author), Ruess, M. (author)
A knock-down factor is commonly used to take into account the obvious decline of the buckling load in a cylindrical shell caused by the inevitable imperfections. In 1968, NASA guideline SP-8007 gave knock-down factors which rely on a lower-bound curve taken from experimental data. Recent research has indicated that the NASA knock-down factors...
journal article 2015
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Häusler, K. (author), Hagan, M.E. (author), Forbes, J.M. (author), Zhang, X. (author), Doornbos, E. (author), Bruinsma, S. (author), Lu, G. (author)
In this paper, we provide insights into limitations imposed by current satellite-based strategies to delineate tidal variability in the thermosphere, as well as the ability of a state-of-the-art model to replicate thermospheric tidal determinations. Toward this end, we conducted a year-long thermosphere-ionosphere-mesosphere-electrodynamics...
journal article 2015
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Zhang, J.T. (author), Forbes, J.M. (author), Zhang, C.H. (author), Doornbos, E.N. (author), Bruinsma, S.L. (author)
As the utilization of low-Earth orbit increases, so does the need for improved ephemeris predictions and thus more accurate density models. In this paper we quantify the density variability of the thermosphere attributable to the lunar gravitational tide, a potentially predictable component of variability not included in any operational density...
journal article 2014
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Zhang, Y. (author), Van Zuijlen, A. (author), Van Bussel, G. (author)
In this paper, three dimensional flow over non-rotating MEXICO blades is simulated by CFD methods. The numerical results are compared with the latest MEXICO wind turbine blades measurements obtained in the low speed low turbulence (LTT) wind tunnel of Delft University of Technology. This study aims to validate CFD codes by using these...
journal article 2014
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Zhang, H. (author), Li, Y. (author), Deng, S. (author)
A two-layer robust control scheme is proposed to get a better response ability for emergency maneuvers of helicopter. Note that the power used in ascending flight is the main coupling between helicopter and its turboshaft engines; therefore vertical flight control is separated from conventional helicopter control loops and combined with fuel...
journal article 2014
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Zhang, B. (author), Teunissen, P.J.G. (author), Odijk, D. (author)
In this contribution, a novel un-differenced (UD) (PPP-RTK) concept, i.e. a synthesis of Precise Point Positioning and Network-based Real-Time Kinematic concept, is introduced. In the first step of our PPP-RTK approach, the UD GNSS observations from a regional reference network are processed based upon re-parameterised observation equations,...
journal article 2011
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Tang, X. (author), Bassir, D.H. (author), Zhang, W. (author)
In this work, we explore simultaneous designs of materials selection and structural optimization. As the material selection turns out to be a discrete process that finds the optimal distribution of materials over the design domain, it cannot be performed with common gradient-based optimization methods. In this paper, material selection is...
journal article 2010
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Kang, Z. (author), Li, J. (author), Zhang, L. (author), Zhao, Q. (author), Zlatanova, S. (author)
This paper presents a new approach to the automatic registration of terrestrial laser scanning (TLS) point clouds using panoramic reflectance images. The approach follows a two-step procedure that includes both pair-wise registration and global registration. The pair-wise registration consists of image matching (pixel-to-pixel correspondence)...
journal article 2009
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Zhu, J. (author), Zhang, W. (author), Bassir, D.H. (author)
The aim of this paper is to enhance the validity of existing evolutionary topology optimization procedures. As this hard-killing scheme related to the element sensitivity values may lead to incorrect predictions of inefficient elements to be removed and the value of the objective function becomes sharply deteriorated during the iterations, a...
journal article 2009
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Ding, Y. (author), Zhang, J.Q. (author)
Retrieve the structure of model and the motion of camera is a classical and hot topic in computer vision and photogrammetry. A lot of automatic or semiautomatic techniques have been developed to optimize the retrieving processing from accuracy, stability and reality perspectives. These techniques are variant from data source, feature selection...
conference paper 2008
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Zhang, G.Q. (author)
doctoral thesis 1993
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Zhang, G.Q. (author), Baruch, M. (author), Arbocz, J. (author)
report 1992
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Baruch, M. (author), Arbocz, J. (author), Zhang, G.Q. (author)
report 1992
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Zhang, G.Q. (author)
report 1992
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Baruch, M. (author), Arbocz, J. (author), Zhang, G.Q. (author)
report 1992
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