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Investigation of the first quasi-rectangular metro tunnel constructed by the 0−θ method

Li, Peinan (author), Liu, Xue (author), Jiang, Xi (author), Zhang, X. (author), Wu, Jun (author), Chen, Peixin (author)

Quasi-rectangular shield tunneling is a cutting-edge trenchless method for constructing metro tunnels with double tubes, owing to its advantages in saving underground space and reducing ground disturbance. However, the conventional quasi-rectangular shield tunneling method is not applicable when constructing a tunnel without a center pillar,...

journal article 2024

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The Mechanism behind Vibration Assisted Fluidization of Cohesive Micro-Silica

Kamphorst, R. (author), van der Sande, P.C. (author), Wu, K. (author), Wagner, E.C. (author), David, M.K. (author), Meesters, G.M.H. (author), van Ommen, J.R. (author)

Vibro-assisted fluidization of cohesive micro-silica has been studied by means of X-ray imaging, pressure drop measurements, and off-line determination of the agglomerate size. Pressure drop and bed height development could be explained by observable phenomena taking place in the bed; slugging, channeling, fluidization or densification. It...

journal article 2024

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Fatigue behaviour of toe and root stiffener cracks in stiffener-to-deck plate weld of orthotropic bridge decks

Wu, W. (author), Veljkovic, M. (author), Kolstein, M.H. (author), Maljaars, Johan (author), Pijpers, Richard (author)

Fatigue cracks in the stiffener-to-deck plate connections of orthotropic bridge decks, initiating from the weld toe or root and propagating into the stiffener or weld throat, are experimentally and numerically studied. A statistical analysis of the structural stress is carried out using the experimental data. Automatic welded specimens show a...

journal article 2024

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Effect of vibrational modes on fluidization characteristics and solid distribution of cohesive micro- and nano-silica powders

Kamphorst, R. (author), Wu, K. (author), van Baarlen, M. (author), Meesters, G.M.H. (author), van Ommen, J.R. (author)

In this study, the impact of different vibrational modes on the fluidization characteristics of cohesive micro- and nano-silica powder was examined. Fractional pressure drop, bed expansion measurements, and X-ray imaging were utilized to characterize the fluidization quality. The densities of the emulsion phase at the top and bottom of the...

journal article 2024

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An analytical framework for the best–worst method

Wu, W. (author), Liu, Xinwang (author), Zhou, Ligang (author), Qin, Jindong (author), Rezaei, J. (author)

Since the development of the best–worst method (BWM) in 2015, it has become a popular research focus in multi-criteria decision-making. The original optimization problem of the BWM is a nonlinear min–max model that can lead to multiple optimal solutions, while the linear model of the BWM produces a unique solution. The two models need to be...

journal article 2024

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Stability Enhanced Design of EV Chargers for Weak Grid Connection

Wang, L. (author), Qin, Z. (author), Wu, Y. (author), Bauer, P. (author)

Reinforcement of the legacy grid infrastructure will be very costly and thereby unrealistic. Consequently, weak grid connection of electric vehicle (EV) chargers will sooner or later be the case. It may however bring instability issues since the EV chargers that can work well in strong grid conditions usually do not fit the weak grid...

conference paper 2023

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Effects of GBFS content and curing methods on the working performance and microstructure of ternary geopolymers based on high-content steel slag

Yang, Xinkui (author), Wu, Shaopeng (author), Xu, S. (author), Chen, B. (author), Chen, Dongyu (author), Wang, Fusong (author), Jiang, Jian (author), Fan, Lulu (author), Tu, Liangliang (author)

Aimed to address the low utilization rate of steel slag (SS) and its challenge in resource utilization in China, this study developed ternary geopolymers made by high-content (50%) SS together with fly ash (FA) and granulated blast furnace slag (GBFS). The effects of GBFS content (0–40%) and curing methods (water curing, standard curing,...

journal article 2023

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How cities are shaped: Railway colonization of Harbin and Changchun in Manchuria from 1895 to 1945

Wu, Xinyue (author)

Harbin and Changchun, although geographically adjacent to Manchuria, developed different architectural styles and urban forms due to completely different planning and colonization strategies during the colonization process from 1895 to 1945. The study contains an analysis summarizing the historical and cultural context and land treaties. Based...

student report 2022

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Efficient Variational Bayes Learning of Graphical Models with Smooth Structural Changes

Yu, Hang (author), Wu, Songwei (author), Dauwels, J.H.G. (author)

Estimating a sequence of dynamic undirected graphical models, in which adjacent graphs share similar structures, is of paramount importance in various social, financial, biological, and engineering systems, since the evolution of such networks can be utilized for example to spot trends, detect anomalies, predict vulnerability, and evaluate...

journal article 2022

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Direct Trajectory Optimization of Free-Floating Space Manipulator for Reducing Spacecraft Variation

Shao, X. (author), Yao, Weiran (author), Li, Xiaolei (author), Sun, Guanghui (author), Wu, Ligang (author)

This letter investigates the direct trajectory optimization of the free-floating space manipulator (FFSM). The main purpose is to plan the joint space trajectories to reduce the spacecraft motion due to the joint rotation during the FFSM performing tasks. To improve the calculation efficiency, the adaptive Radau pseudospectral method (A-RPM)...

journal article 2022

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Numerical simulation on reflective cracking behavior of asphalt pavement

Wang, Houzhi (author), Wu, You (author), Yang, Jun (author), Wang, H. (author)

Cracks are one of the main problems that plague road workers. A correct understanding of the internal crack propagation mechanism of asphalt pavement will help road workers evaluate the road’s working status more comprehensively and make more reasonable decisions in design, construction, and maintenance work. This paper established a three...

journal article 2021

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Alternating optimization of design and stress for stress-constrained topology optimization

Zhai, X. (author), Chen, Falai (author), Wu, J. (author)

Handling stress constraints is an important topic in topology optimization. In this paper, we introduce an interpretation of stresses as optimization variables, leading to an augmented Lagrangian formulation. This formulation takes two sets of optimization variables, i.e., an auxiliary stress variable per element, in addition to a density...

journal article 2021

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Utilizing crosswise self-growing connection as load-bearing element in building design

Wu, Zhinan (author)

Within the context of utilizing alternative materials to promote sustainable construction in the building industry, Living Architecture is a concept that uses living organisms as the building materials. As a rather unconventional approach, it possesses benefits such as low cost, not requiring considerable workforce or industrial material, carbon...

master thesis 2020

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Measuring method for partial discharges in a high voltage cable system subjected to impulse and superimposed voltage under laboratory conditions

Wu, J. (author), Mor, A. R. (author), van Nes, P.V.M. (author), Smit, J.J. (author)

A partial discharge (PD) measuring system has been deployed in order to identify and measure PD in a high voltage (HV) cable joint under impulse and superimposed voltages under laboratory conditions. The challenge is to enable the detection of PD during the impulse conditions. The method of measurement has been investigated by introducing an...

journal article 2019

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Interface reduction for Hurty/Craig-Bampton substructured models: Review and improvements

Krattiger, Dimitri (author), Wu, L. (author), Zacharczuk, Martin (author), Buck, Martin (author), Kuether, Robert J. (author), Allen, Matthew S. (author), Tiso, P. (author), Brake, Matthew R.W. (author)

The Hurty/Craig-Bampton method in structural dynamics represents the interior dynamics of each subcomponent in a substructured system with a truncated set of normal modes and retains all of the physical degrees of freedom at the substructure interfaces. This makes the assembly of substructures into a reduced-order system model relatively...

review 2019

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Lumen Degradation Lifetime Prediction for High-Power White LEDs Based on the Gamma Process Model

Ibrahim, M.S. (author), Fan, J. (author), Yung, Winco K.C. (author), Wu, Zeyu (author), Sun, B. (author)

Nowadays, due to the advancement of design and manufacturing technology, there are many consumer products with high reliability. Similarly, the competition in the business sector influences the product development time to become shorter and that makes it difficult for manufacturers to evaluate the reliability of current products before new...

journal article 2019

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Fast ℓ₁-regularized space-Time adaptive processing using alternating direction method of multipliers

Qin, Lilong (author), Wu, Manqing (author), Wang, X. (author), Dong, Zhen (author)

Motivated by the sparsity of filter coefficients in full-dimension space-Time adaptive processing (STAP) algorithms, this paper proposes a fast ℓ1-regularized STAP algorithm based on the alternating direction method of multipliers to accelerate the convergence and reduce the calculations. The proposed algorithm uses a splitting variable to...

journal article 2017

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Nonlinear model order reduction for flexible multibody dynamics: A modal derivatives approach

Wu, L. (author), Tiso, P. (author)

An effective reduction technique is presented for flexible multibody systems, for which the elastic deflection could not be considered small. We consider here the planar beam systems undergoing large elastic rotations, in the floating frame description. The proposed method enriches the classical linear reduction basis with modal derivatives...

journal article 2015

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Computation of the flash-temperature at the wheel-rail contact using a 3D finite element model and its comparison with analytical methods

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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The Vector Form Intrinsic Finite Element method and several other form-finding methods for general networks

Li, Q. (author), Borgart, A. (author), Wu, Yue (author)

Discrete networks is a kind of form-active structural system which actively change its shape under varying load conditions. And for this kind of structural system, form-finding is the initial and essential part in their design process. Before the computer age, people complete the form-finding process using physical models, while with the...

conference paper 2015