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Numerical analyses of energy balance and installation mechanisms of large-diameter tapered monopiles by impact driving

Chen, Fuquan (author), Liu, Liyang (author), Lai, F. (author), Gavin, Kenneth (author), Flynn, Kevin N. (author), Li, Yida (author)

Large-diameter monopiles are widely used as the foundation to support offshore wind turbines (OWTs) in shallow coastal waters. The benefits of small-to-medium diameter tapered piles have been reported in the past. The potential use of large-diameter tapered monopiles installed by impact driving to support OWTs is thus presented, and then...

journal article 2022

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Multi-component analysis, molecular model construction, and thermodynamics performance prediction on various rejuvenators of aged bitumen

Ren, S. (author), Liu, X. (author), Erkens, S. (author), Lin, P. (author), Gao, Y. (author)

The molecular dynamics (MD) simulation method is proved as an efficient tool to explore the intermolecular interaction between rejuvenators and aged bitumen, but the simple “singlemolecule” model of rejuvenator would bring the inaccuracy to simulation outputs due to a huge difference with its realistic multi-component chrematistic. This study...

journal article 2022

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Surface Modification of Steel Slag Aggregate for Engineering Application in Asphalt Mixture

Niu, D. (author), Zhang, Zhao (author), Meng, Jiandang (author), Yang, Zhengxian (author), Jing, R. (author), Liu, X. (author), Lin, P. (author), Sheng, Yanping (author)

The proper disposal of steel slag has always been a great challenge for the metallurgical industry in China and around the world. In this work, the steel slag aggregate (SSA) was surface pretreated (PSSA) and applied into asphalt mixture. The adhesive behavior between the bitumen and five different types of aggregates (i.e., limestone, diorite,...

journal article 2022

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Accelerating Building Energy Retrofitting with BIM-Enabled BREEAM-NL Assessment

Simhachalam, V. (author), Wang, T. (author), Liu, Y. (author), Wamelink, J.W.F. (author), Montenegro, Lorena (author), Van Gorp, Geert (author)

The Paris Agreement requires building retrofitting practices to be more efficient and effective. However, the current practice for building energy retrofitting is lacking behind, and one reason for that is the time-consuming process of energy credit evaluation. Energy performance assessment such as BREEAM-NL in the Netherlands could apply a more...

journal article 2021

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Sustainable Passive Design for Building Performance of Healthy Built Environment in the Lingnan Area

Li, Bin (author), Guo, Weihong (author), Liu, Xiao (author), Zhang, Yuqing (author), Russell, P.J. (author), Schnabel, Marc Aurel (author)

Having a healthy built environment becomes increasingly important, especially under the effects of COVID-19. This paper intends to combine sustainable goals based on climate change with passive design principles to achieve a healthy built environment regarding the building performance of residential buildings. The Yuedao Residential Community in...

journal article 2021

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An investigation on the fatigue performance of cracked steel plates reinforced with FRP and stop hole

Liu, Zhiping (author), Li, Z. (author), Huang, Chuanhai (author), Jiang, X. (author)

In this paper, we implement the combined method of drilling stop hole and FRP reinforcement to repair cracked steel plates subjected to cyclic tension. The crack initiation and growth are experimentally investigated. The stress distribution at the stop hole and the residual fatigue life are evaluated by the FEM. The effects on prolonging...

journal article 2021

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Coordinative performance of HVDC circuit breakers in MTDC grids

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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Use of epoxy asphalt as surfacing and tack coat material for roadway pavements

Apostolidis, P. (author), Liu, X. (author), Erkens, S. (author), Scarpas, Athanasios (author)

This work presents an experimental program developed to evaluate the effect of epoxy-asphalt binder, used as replacement of bitumen, on the durability and fatigue life of an asphalt concrete mix. The use of epoxy-type binder as tack coat has been explored as well and thus experiments have been conducted to quantify the effect of epoxy tack coat...

journal article 2020

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Modeling, Experimental Validation, and Application of VARC HVDC Circuit Breakers

Liu, S. (author), Popov, M. (author), Mirhosseini, S.S. (author), Nee, Simon (author), Modeer, Tomas (author), Ängquist, Lennart (author), Belda, Nadew (author), Koreman, Kees (author), van der Meijden, M.A.M.M. (author)

This paper deals with the modeling, hardware results and model validation by measurements of a VSC assisted resonant current (VARC) dc circuit breaker (CB) and the application within a future network by simulation. The newly emerging VARC dc CB can be used as a solution for the protection of offshore multi-terminal HVDC (MTDC) grids. In this...

journal article 2020

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Modeling a voltage source converter assisted resonant current DC breaker for real time studies

Mirhosseini, S.S. (author), Liu, S. (author), de Jesus Chavez, Jose (author), Liu, Z. (author), Jamali, Sadegh (author), Popov, M. (author)

In order to test protection performance of future multi-terminal HVDC grids where DC circuit breakers (DC CBs) play an important role, a DC CB model in real time test environment should be developed. It is well known that a DC CB needs to interrupt DC faults very quickly in order to avoid converter damages and to ensure security of supply....

journal article 2020

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A Bayesian Network Approach for Condition Monitoring of High-Speed Railway Catenaries

Wang, H. (author), Nunez, Alfredo (author), Liu, Zhigang (author), Zhang, Dongliang (author), Dollevoet, R.P.B.J. (author)

The growing variety of data from condition monitoring of high-speed railways offer unprecedented opportunities to improve railway infrastructure maintenance. For condition monitoring of railway catenaries, this paper proposes a data-driven approach that uses a Bayesian network (BN) to integrate the inspection data from catenaries into a key...

journal article 2020

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Effect of synthetic fibres on fracture performance of asphalt mortar

Apostolidis, P. (author), Liu, X. (author), Daniel, Gerald C. (author), Erkens, S. (author), Scarpas, Athanasios (author)

The utilisation of synthetic fibres has been reported in the past showing enhancement of fatigue and thermal cracking resistance in asphaltic materials. However, the limited evidences about the benefits of these fibres in asphaltic materials at low material scales have been noticed. Also, the exact reinforcing mechanism of binding system in the...

journal article 2019

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Mechanical DC circuit breaker model for real time simulations

Liu, S. (author), Liu, Z. (author), de Jesus Chavez, Jose (author), Popov, M. (author)

The main goal of the paper is the modeling of the mechanical circuit breaker (MCB) that can replicate the breaker characteristics in real time environment. The proposed MCB with active current injection is modelled for a system level, which provides adequate representation of the circuit breakers for system analysis studies. External current...

journal article 2019

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Multi-Objective Performance Evaluation of the Detection of Catenary Support Components Using DCNNs

Liu, W. (author), Liu, Zhigang (author), Nunez, Alfredo (author), Wang, Liyou (author), Liu, Kai (author), Lyu, Yang (author), Wang, H. (author)

The goal of this paper is to evaluate from a multi-objective perspective the performance on the detection of catenary support components when using state-of-the-art deep convolutional neural networks (DCNNs). The detection of components is the first step towards a complete automatized monitoring system that will provide actual information about...

conference paper 2018

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The effects of graphene stacking on the performance of methane sensor: A first-principles study on the adsorption, band gap and doping of graphene

Yang, Ning (author), Yang, Daoguo (author), Zhang, Kouchi (author), Chen, Liangbiao (author), Liu, Dongjing (author), Cai, Miao (author), Fan, Xuejun (author)

The effects of graphene stacking are investigated by comparing the results of methane adsorption energy, electronic performance, and the doping feasibility of five dopants (i.e., B, N, Al, Si, and P) via first-principles theory. Both zigzag and armchair graphenes are considered. It is found that the zigzag graphene with Bernal stacking has...

journal article 2018

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Development of HVDC system-level mechanical circuit breaker model

Liu, S. (author), Popov, M. (author)

The main goal of the paper is the modelling of the mechanical direct current circuit breaker (DC CB) with active current injection that includes different circuit breaker characteristics. System level models provide adequate representation of the circuit breakers for system analysis studies. The performance characteristics of the DC CB in...

journal article 2018

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On the relationship between compensation difference and voluntary turnover rate of core staff and enterprise performance of small and micro technology enterprises based on tournament theory

Liu, A. (author), Zhong, W. (author), Xiang, Rong (author), Yi, Silian (author), Pan, Lu (author)

Small and micro technology enterprises are the most active and promising groups in scientific and technological innovation. The health and stability of these enterprises are critical to the steady and rapid development of the national economy. Based on the tournament theory and empirical analysis, this paper probes into the influence of...

journal article 2017

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Sixty years of research on ship rudders: Effects of design choices on rudder performance

Liu, J. (author), Hekkenberg, R.G. (author)

Rudders are primary steering devices for merchant ships. The main purpose of using rudders is to generate forces for course keeping and manoeuvring. In exceptional cases, rudders are also used for emergency stopping and roll stabilisation. Furthermore, rudders affect propeller thrust efficiency and total ship resistance. Therefore, rudders...

journal article 2017

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Viscoelastic stress modeling in cementitious materials using constant viscoelastic hydration modulus

Hansen, W. (author), Liu, Z. (author), Koenders, E.A.B. (author)

Viscoelastic stress modeling in ageing cementitious materials is of major importance in high performance concrete of low water cement ratio (e.g. w/c ~0.35) where crack resistance due to deformation restraint needs to be determined. Total stress analysis is complicated by the occurrence of internal stresses due to shrinkage, which requires...

conference paper 2014

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Technologies and Business Model Explorations for Risks and Performances Management in Dutch Commercial Buildings

Liu, Q. (author)

Priva is a Dutch company in the field of indoor control and automation. Its two main business segments are commercial building control and greenhouse control. In the commercial building segment, Priva’s business currently specializes in Heating, Ventilation and Air Conditioning (HVAC) control, floor control and energy management.However,...

master thesis 2012