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Arcondoulis, Elias J. G. (author), Liu, Yu (author), Yang, Yannian (author), Ragni, D. (author), Rubio Carpio, A. (author), Avallone, F. (author)View Video Presentation: https://doi-org.tudelft.idm.oclc.org/10.2514/6.2021-2226.vid<br/><br/>The mechanisms responsible for vortex shedding reduction, due to the application of a porous coating to a smooth cylinder placed in uniform flow, are still uncertain despite several numerical and experimental studies. To help understand these...conference paper 2021
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Geng, Xin (author), Hu, Tianxiang (author), Liu, Peiqing (author), Sinnige, T. (author), Eitelberg, G. (author)The increasing demand for short-range passenger air transport and the strong push for aircraft with electric propulsion has renewed research interest in propellers. Despite the unmatched aerodynamic efficiency of propellers, their relatively high noise emissions limit widespread application on aircraft. Previous research has not systematically...conference paper 2021
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Gómez Pérez, P. (author), Liu, Y. (author), Cowan, K.J. (author)In this work, we propose a new method to approximate the cost function of Low-Thrust, Multiple-Gravity-Assist interplanetary trajectories using a Machine Learning surrogate. We identified the computation time required to obtain training data as the main limitation when using Machine Learning methods for this purpose so we present a strategy to...conference paper 2021
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Liu, Zhenyu (author), Fu, Runnan (author), Wang, Linjun (author), Jin, Yuzhen (author), Papakostas, Theodoros (author), Mainelli, Xenia Una (author), Voûte, R.L. (author), Verbree, E. (author)Because unknown interior layouts can have serious consequences in time-sensitive situations, crisis response teams request many potential solutions for visualizing indoor environments in crisis scenarios. This research uses a game engine to directly visualize point cloud data input of indoor environments for generating clear interaction between...conference paper 2021
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Liu, Y. (author), Semertzis, I. (author), Stefanov, Alexandru (author), Palensky, P. (author)The security issues of Cyber-Physical power Systems (CPS) have attracted widespread attention from scholars. Vulnerability assessment emerges as an effective method to identify the critical components and thus increase the system resilience. While efforts have been made to study the vulnerability features of power systems under the occurrence...conference paper 2021
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Zhang, Y. (author), Liu, X. (author), Ren, S. (author), Jing, R. (author), Gard, W.F. (author), Apostolidis, P. (author), Erkens, S. (author), Scarpas, Athanasios (author)Lignin, one of the most abundant natural polymers, has been extensively studied as liquid or solid additive in bituminous binders. Despite the fact the organosolv lignin in bitumen improves the overall resistance against oxidative aging, lignin could lead to binders of high thermal cracking sensitivity. In this study, a bio-based oil is...conference paper 2021
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Liu, Hexin (author), Perera, Leibny Paola Garcia (author), Zhang, Xinyi (author), Dauwels, J.H.G. (author), Khong, Andy W.H. (author), Khudanpur, Sanjeev (author), Styles, Suzy J. (author)We propose two end-to-end neural configurations for language diarization on bilingual code-switching speech. The first, a BLSTM-E2E architecture, includes a set of stacked bidirectional LSTMs to compute embeddings and incorporates the deep clustering loss to enforce grouping of languages belonging to the same class. The second, an XSA-E2E...conference paper 2021
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Liu, Y. (author), Ferrari, Riccardo M.G. (author), van Wingerden, J.W. (author)Individual Pitch Control (IPC) is an effective control strategy to mitigate the blade loads on large-scale wind turbines. Since IPC usually requires high pitch actuation, the safety constraints of the pitch actuator should be taken into account when designing the controller. This paper introduces a constrained Subspace Predictive Repetitive...conference paper 2021
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Liu, Hao (author), Ye, Hanting (author), Yang, J. (author), Wang, Q. (author)Motivated by the trend of realizing full screens on devices such as smartphones, in this work we propose through-screen sensing with visible light for the application of fingertip air-writing. The system can recognize handwritten digits with under-screen photodiodes as the receiver. The key idea is to recognize the weak light reflected by the...conference paper 2021
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Hong, H. (author), Ye, Li (author), Li, Ke (author), Sarro, Pasqualina M (author), Zhang, Kouchi (author), Liu, Zewen (author)In this paper, we report a modified three step anisotropic wet etching (TSWE) method to fabricate solid-state silicon nanoslits. The slit-opening process is performed by <111> crystal plane etching. The etching rate of the <111> crystal plane is reasonably slow as it is only 1/45 of the <100> etching rate, thus allowing and...conference paper 2021
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Ren, S. (author), Liu, X. (author), Lin, P. (author), Erkens, S. (author)This study elaborates the influence of blends formulated by waste oil (WO) and styrene-butadiene rubber (SBR) on thermo-mechanical and chemical compositional characteristics of rejuvenated bitumen. The results show that both WEO (waste engine oil) and WCO (waste cooking oil) can compensate viscous component for reclaimed bitumen, and the effect...conference paper 2021
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Boot, T. (author), Riemslag, A.C. (author), Reinton, T.E. (author), Liu, Ping (author), Walters, C.L. (author), Popovich, V. (author)With fossil fuels being phased out and growing global interest in a hydrogen economy, there is demand for re-purposing existing pipelines for transportation of hydrogen gas. However, hydrogen embrittlement (HE) can limit pipeline steel’s performance. In this study, the effect of hydrogen on the mechanical properties of an X60 base metal ...conference paper 2021
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Pradel, Michael (author), Gousios, G. (author), Liu, Jason (author), Chandra, Satish (author)Maintaining large code bases written in dynamically typed languages, such as JavaScript or Python, can be challenging due to the absence of type annotations: simple data compatibility errors proliferate, IDE support is limited, and APIs are hard to comprehend. Recent work attempts to address those issues through either static type inference or...conference paper 2020
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Liu, Dong (author), Hasanov, Urfan (author), Ye, Changqing (author), Gou, Xiaofan (author), Wang, X. (author)Compared with partially superconducting generators, fully superconducting generators (F-SCGs) can further increase the torque density in large direct-drive wind turbine applications. Design trends of F-SCGs intend to increase the electrical loading by applying superconducting wires and boost the current density in the armature winding to meet...conference paper 2020
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Liu, S. (author), Shetgaonkar, Ajay (author), Popov, M. (author)The objective of this paper is to investigate the coordinative performance of different types of high voltage DC (HVDC) circuit breakers (CBs) in multi-terminal DC (MTDC) grids. Several different HVDC CB technologies are emerging as a solution for the protection of offshore MTDC grids. There is a need for coordinative operation between different...conference paper 2020
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Liu, Pan (author), Li, J. (author), van Zeijl, H.W. (author), Zhang, Kouchi (author)A polymer-based wafer level integration technology suitable for miniaturized and multi-functional systems integration was developed and demonstrated in this work. Wafer scale flexible interconnects were firstly fabricated on one wafer, and then transferred to another wafer. Such transfer process involved wafer bonding and application of...conference paper 2020
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Liu, Y. (author), Frederik, J.A. (author), Fontanella, A. (author), Ferrari, Riccardo M.G. (author), van Wingerden, J.W. (author)Individual Pitch Control (IPC) is a well-known and, in normal operating conditions, effective approach to alleviate blade loads in wind turbines. However, in the case of a Pitch Actuator Stuck (PAS) type of fault, conventional IPC is not beneficial since its action is disturbed by the failed pitch actuator. In this paper, a Subspace...conference paper 2020
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Zhong, J. (author), Liu, Zhigang (author), Wang, H. (author), Liu, W. (author), Yang, Cheng (author), Nunez, Alfredo (author)Brace Sleeve (BS) plays an essential role in connecting and fixing cantilevers of railway catenary systems. It needs to be monitored to ensure the safety of railway operations. In the literature, image processing techniques that can localize BSs from inspection images are proposed. However, the boxes produced by existing methods can contain...conference paper 2020
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Bouwman, Lieve (author), Liu, Y. (author), Cowan, K.J. (author)Low-thrust trajectories can benefit the search for propellant-optimal trajectories, but increases in modeling complexity and computational load remain a challenge for efficient mission design and optimization. In this paper, an approach for developing models utilizing Gaussian Process (GP) regression and classification is proposed to perform...conference paper 2020
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Ketelaar, Gini (author), Bähr, Hermann (author), Liu, Shizhuo (author), Piening, Harry (author), van der Veen, Wim (author), Hanssen, R.F. (author), van Leijen, F.J. (author), van der Marel, H. (author), Samiei Esfahany, S. (author)This paper describes several geodetic studies that consolidate the reliability and precision of monitoring subsidence due to hydrocarbon production: the deployment of Integrated Geodetic Reference Stations (IGRS); the application of high resolution InSAR; the comparison of different GNSS processing methodologies; the implementation of an...conference paper 2020