Searched for: author:"Wu, J."
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Kuipers, T. (author), Wu, J. (author), Wang, C.C. (author)
The fabrication flexibility of 3D printing has sparked a lot of interest in designing structures with spatially graded material properties. In this paper, we propose a new type of density graded structure that is particularly designed for 3D printing systems based on filament extrusion. In order to ensure high-quality fabrication results,...
journal article 2019
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Groen, J.P. (author), Wu, J. (author), Sigmund, Ole (author)
This paper concerns compliance minimization and projection of coated structures with orthotropic infill material in 2D. The purpose of the work is two-fold. First, we introduce an efficient homogenization-based approach to perform topology optimization of coated structures with orthotropic infill material. The design space is relaxed to allow...
journal article 2019
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Wu, J. (author), Rodrigo Mor, A. R. (author), Smit, J.J. (author)
In practice, cross-linked polyethylene (XLPE) power cables can be subjected to alternating voltage with superimposed impulse transients. Such impulse transients may initiate partial discharges (PD) in insulation defects even below AC inception voltage. An initiated PD may persist under AC, which will cause insulation degradation. This paper...
journal article 2019
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Wu, J. (author)
The microstructural aspects of rolling contact fatigue in rails were studied. The rail track is a critical component of the railway system and its long-term performance contributes crucially to the sustainable development of the railway system. The increasing demands of trains with a higher speed/capacity impose more severe load conditions on...
doctoral thesis 2018
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Liu, Xiuping (author), Lin, Liping (author), Wu, J. (author), Wang, W. (author), Yin, Baocai (author), Wang, C.C. (author)
Wireframe models are becoming a popular option in 3D printing. Generating sparse wireframe models using classic mesh simplification methods leads to models that require a lot of support structures in the layer-upon-layer additive process. In this paper we present a mesh simplification method that takes into account the overhang angle....
journal article 2018
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Wang, Weiming (author), Liu, Yong-Jin (author), Wu, J. (author), Tian, Shengjing (author), Wang, C.C. (author), Liu, Ligang (author), Liu, Xiuping (author)
Offsetting-based hollowing is a solid modeling operation widely used in 3D printing, which can change the model's physical properties and reduce the weight by generating voids inside a model. However, a hollowing operation can lead to additional supporting structures for fabrication in interior voids, which cannot be removed. As a consequence...
journal article 2018
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Wu, J. (author), Petrov, R.H. (author), Kölling, S. (author), Godet, S (author), Sietsma, J. (author)
Micro- to nano-scale characterization of the microstructures in the white etching layer (WEL), observed in a Dutch R260 Mn grade rail steel, was performed via various techniques. Retained austenite in the WEL was identified via electron backscatter diffraction (EBSD), automatic crystallographic orientation mapping in transmission electron...
journal article 2018
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Wu, J. (author), Clausen, Anders (author), Sigmund, Ole (author)
Additively manufactured parts are often composed of two sub-structures, a solid shell forming their exterior and a porous infill occupying the interior. To account for this feature this paper presents a novel method for generating simultaneously optimized shell and infill in the context of minimum compliance topology optimization. Our method...
journal article 2017
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Hou, Y. (author), Verhagen, A.A. (author), Wu, J (author)
Ambiguity Resolution (AR) plays a vital role in precise GNSS positioning. Correctly-fixed integer ambiguities can significantly improve the positioning solution, while incorrectly-fixed integer ambiguities can bring large positioning errors and, therefore, should be avoided. The ratio test is an extensively used test to validate the fixed...
journal article 2016
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Wu, J. (author), Ning, F. (author), Trinh, T.T. (author), Kjelstrup, S. (author), Vlugt, T.J.H. (author), He, J. (author), Skallerud, B.H. (author), Zhang, Z. (author)
Despite observations of massive methane release and geohazards associated with gas hydrate instability in nature, as well as ductile flow accompanying hydrate dissociation in artificial polycrystalline methane hydrates in the laboratory, the destabilising mechanisms of gas hydrates under deformation and their grain-boundary structures have not...
journal article 2015
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Naeimi, M. (author), Li, Z. (author), Dollevoet, R.P.B.J. (author), Wu, J. (author), Petrov, R.H. (author), Sietsma, J. (author)
The coupled mechanical–thermal behaviour of wheel and rail materials under rolling contact is studied to determine the temperature rise due to the frictional heat. The wheel–rail frictional rolling contact problem is solved using the three–dimensional finite element (FE) method. The FE model considers the wheel tread–rail top contact with...
conference paper 2015
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Naeimi, M. (author), Li, Z. (author), Petrov, R.H. (author), Dollevoet, R.P.B.J. (author), Sietsma, J. (author), Wu, J. (author)
The substantial similarity of fatigue mechanism in a new test rig for rolling contact fatigue (RCF) has been investigated. A new reduced-scale test rig is designed to perform controlled RCF tests in wheel-rail materials. The fatigue mechanism of the rig is evaluated in this study using a combined finite element-fatigue prediction approach. The...
conference paper 2014
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Wu, J. (author)
The project is located in Kleipolder, Rotterdam. Kleinpolder is the largest 3D interchange of the Netherlands, and it was built in the 60’s. The project aims at, firstly, inserting a harmonious design that fits into the site, which can transform the interchange in a vertical green farm without losing the interchange’s characters; secondly,...
master thesis 2014
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Wu, J. (author)
master thesis 2014
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Wu, J. (author)
Wind sensors are widely used in many critical applications, such as navigation, weather forecast, aerospace and wind energy assessment. The thermal wind sensor can measure wind speed and direction at the same time, by measuring the temperature gradient on the sensor’s surface which is induced by the wind flow. Compared to traditional mechanical...
master thesis 2013
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Kärnä, Tuomas (author), Andersen, H. (author), Gürtner, A. (author), Metrikine, A. (author), Sodhi, D. (author), van het Loo, M (author), Kuiper, G. (author), Gibson, R. (author), Fenz, D. (author), Muggeridge, K. (author), Wallenburg, C. (author), Wu, J. F. (author), Jefferies, M. (author)
The paper deals with the classical ice engineering challenge of ice-induced vibrations (IIV) of offshore platforms. There is still a general industry concern with aspects of IIV and the load amplification that can arise in some situations resulting from ice interaction with a structure. It was thought important to re-visit current design...
journal article 2013
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Wu, J. (author)
Complex networks describe a wide range of systems and structures in the world. Any real network can be modeled as graph, expressed by an adjacency matrix or list. In many complex networks, when a graph of a certain type grows in size, its properties are expected to change. Each complex network presents specific topological features which...
master thesis 2009
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Wu, J. (author)
master thesis 2007
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Wu, J. (author)
The aim of the study is to develop a ‘design tool’, that is a method to enhance the design and planning of facilities for the sustainable production of new knowledge. More precisely, the objective is to identify a method to support the conception of building complexes related to the long-term production of new knowledge. The tool is focused on...
doctoral thesis 2005
document
Wu, J. (author)
master thesis 2004
Searched for: author:"Wu, J."
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