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Articles 301 - 326 of 326
Full-Text Articles in Engineering
Modeling And Motion Control Of A Liquid Metal Droplet In A Fluidic Channel, Jie Xie, Fangxia Li, Shaolong Kuang, Hao Yang, Xiangpeng Li, Shiyang Tang, Weihua Li, Shiwu Zhang
Modeling And Motion Control Of A Liquid Metal Droplet In A Fluidic Channel, Jie Xie, Fangxia Li, Shaolong Kuang, Hao Yang, Xiangpeng Li, Shiyang Tang, Weihua Li, Shiwu Zhang
Faculty of Engineering and Information Sciences - Papers: Part B
© 1996-2012 IEEE. As an emerging multifunctional material, Gallium-based room temperature liquid metal has attracted a lot of attention for a variety of applications due to its mobility and deformability. However, controlling the motion of a liquid metal droplet accurately still remains unrevealed, which restricts its application in many fields. In this article, we propose a hybrid framework that would control the motion of a liquid metal droplet in a one-dimensional (1-D) fluidic channel. A dynamic model of a liquid metal droplet immersed in the electrolyte when an electrical field is applied to each end of the channel is discussed …
Effects Of Cold Rolling And Annealing On The Ridging Behaviour Of Ferritic Stainless Steel, Xiaoguang Ma, Jingwei Zhao, Wei Du, Zhengyi Jiang
Effects Of Cold Rolling And Annealing On The Ridging Behaviour Of Ferritic Stainless Steel, Xiaoguang Ma, Jingwei Zhao, Wei Du, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part B
© 2020, Springer-Verlag London Ltd., part of Springer Nature. A systematic study was carried out to evaluate the effects of cold rolling and annealing processes on the ridging severity of ferritic stainless steel (FSS). Both microstructural refinement and texture optimisation were achieved with an optimised processing schedule to improve the ridging resistance of FSS. Coarse grain bands comprising of primarily {112} oriented grains were found to form inside cold-rolled and annealed FSS sheets. The effects of annealing schedules and the resultant microstructure and texture on the ridging behaviour of FSS are discussed. The results indicate that the reduction in the …
Admissibilisation Of Singular Interval Type-2 Takagi-Sugeno Fuzzy Systems With Time Delay, Zhiguang Feng, Huayang Zhang, Haiping Du, Zhengyi Jiang
Admissibilisation Of Singular Interval Type-2 Takagi-Sugeno Fuzzy Systems With Time Delay, Zhiguang Feng, Huayang Zhang, Haiping Du, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part B
© The Institution of Engineering and Technology 2020. This study investigates the admissibility analysis and stabilisation problems for singular interval type-2 Takagi- Sugeno fuzzy systems with time delay. A generalised integral inequality method is used to obtain the delay-dependent condition. The criteria for admissibility analysis and controller synthesis are given in terms of linear matrix inequalities. In order to reduce the conservatism of the system, some free weighting matrices and advanced integral inequalities are introduced. Finally, two illustrative examples are exhibited to demonstrate the effectiveness of the proposed method.
Interfacial Characteristics And Mechanical Properties Of Duplex Stainless Steel Bimetal Composite By Heat Treatment, Zhou Li, Jingwei Zhao, Fanghui Jia, Xiaojun Liang, Qingfeng Zhang, Xiangqian Yuan, Sihai Jiao, Zhengyi Jiang
Interfacial Characteristics And Mechanical Properties Of Duplex Stainless Steel Bimetal Composite By Heat Treatment, Zhou Li, Jingwei Zhao, Fanghui Jia, Xiaojun Liang, Qingfeng Zhang, Xiangqian Yuan, Sihai Jiao, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part B
© 2020 Elsevier B.V. The interfacial morphologies play a crucial role in mechanical properties of laminated/bimetal composite. This study investigates the effects of heat treatments on the interfacial characteristics, mechanical properties and fracture behaviour of a 2205 duplex stainless steel/AH36 carbon steel bimetal composite with varying interface situations fabricated by the hot-rolling and subsequent heat treatments. The bimetal composite was annealed from 850 °C to 1150 °C in steps of 100 °C with soaking 1 h. Heterogeneities of grain size and element concentration exist in the microstructural evolution of bonding zone adjacent to interface after annealing treatments, which were observed …
Cartan Subalgebras For Non-Principal Twisted Groupoid C⁎-Algebras, Anna L. Duwenig, E Gillaspy, R Norton, S Reznikoff, S Wright
Cartan Subalgebras For Non-Principal Twisted Groupoid C⁎-Algebras, Anna L. Duwenig, E Gillaspy, R Norton, S Reznikoff, S Wright
Faculty of Engineering and Information Sciences - Papers: Part B
2020 Elsevier Inc. Renault proved in 2008 [22, Theorem 5.2] that if G is a topologically principal groupoid, then C0(G(0)) is a Cartan subalgebra in Cr⁎(G,Σ) for any twist Σ over G. However, there are many groupoids which are not topologically principal, yet their (twisted) C⁎-algebras admit Cartan subalgebras. This paper gives a dynamical description of a class of such Cartan subalgebras, by identifying conditions on a 2-cocycle c on G and a subgroupoid S⊆G under which Cr⁎(S,c) is Cartan in Cr⁎(G,c). When G is a discrete group, we also describe the Weyl groupoid and twist associated to these Cartan …
An Unsupervised Deep Learning Technique For Susceptibility Artifact Correction In Reversed Phase-Encoding Epi Images, Soan Duong, Son Lam Phung, Abdesselam Bouzerdoum, Mark M. Schira
An Unsupervised Deep Learning Technique For Susceptibility Artifact Correction In Reversed Phase-Encoding Epi Images, Soan Duong, Son Lam Phung, Abdesselam Bouzerdoum, Mark M. Schira
Faculty of Engineering and Information Sciences - Papers: Part B
© 2020 Elsevier Inc. Echo planar imaging (EPI) is a fast and non-invasive magnetic resonance imaging technique that supports data acquisition at high spatial and temporal resolutions. However, susceptibility artifacts, which cause the misalignment to the underlying structural image, are unavoidable distortions in EPI. Traditional susceptibility artifact correction (SAC) methods estimate the displacement field by optimizing an objective function that involves one or more pairs of reversed phase-encoding (PE) images. The estimated displacement field is then used to unwarp the distorted images and produce the corrected images. Since this conventional approach is time-consuming, we propose an end-to-end deep learning technique, …
Period-One Microwave Photonic Sensing By A Laser Diode With Optical Feedback, Bairun Nie, Yuxi Ruan, Yanguang Yu, Qinghua Guo, Jiangtao Xi, Jun Tong
Period-One Microwave Photonic Sensing By A Laser Diode With Optical Feedback, Bairun Nie, Yuxi Ruan, Yanguang Yu, Qinghua Guo, Jiangtao Xi, Jun Tong
Faculty of Engineering and Information Sciences - Papers: Part B
With external optical feedback (EOF), a laser diode (LD) can operate at different dynamic states. In this work, an LD with EOF is set at period-one (P1) oscillation state to generate microwave photonic (MWP) signal for sensing. Firstly, the P1 state boundary of the LD is determined and then the influence of the LD controllable parameters on the boundary is studied by solving the well-known Lang-Kobayashi equations. A set of parameters selection rule for designing an LD based MWP sensing system is obtained. In addition, a measurement algorithm for recovering the displacement from an MWP sensing signal is developed. By …
Using Cost-Sensitive Learning And Feature Selection Algorithms To Improve The Performance Of Imbalanced Classification, Fang Feng, Kuan-Ching Li, Jun Shen, Qingguo Zhou, Xuhui Yang
Using Cost-Sensitive Learning And Feature Selection Algorithms To Improve The Performance Of Imbalanced Classification, Fang Feng, Kuan-Ching Li, Jun Shen, Qingguo Zhou, Xuhui Yang
Faculty of Engineering and Information Sciences - Papers: Part A
Imbalanced data problem is widely present in network intrusion detection, spam filtering, biomedical engineering, finance, science, being a challenge in many real-life data-intensive applications. Classifier bias occurs when traditional classification algorithms are used to deal with imbalanced data. As already known, the General Vector Machine (GVM) algorithm has good generalization ability, though it does not work well for the imbalanced classification. Additionally, the state-of-the-art Binary Ant Lion Optimizer (BALO) algorithm has high exploitability and fast convergence rate. Based on these facts, we have proposed in this paper a Cost-sensitive Feature selection General Vector Machine (CFGVM) algorithm based on GVM and …
Automatic Ventricular Nuclear Magnetic Resonance Image Processing With Deep Learning, Binbin Yong, Chen Wang, Jun Shen, Fucun Li, Hang Yin
Automatic Ventricular Nuclear Magnetic Resonance Image Processing With Deep Learning, Binbin Yong, Chen Wang, Jun Shen, Fucun Li, Hang Yin
Faculty of Engineering and Information Sciences - Papers: Part A
Cardiovascular diseases (CVD) seriously threaten the health of human beings, and they have caused widespread concern in recent years. At present, the diagnosis of CVD is mainly conducted by computed tomography (CT), echocardiography and nuclear magnetic resonance (NMR) technologies. NMR imaging technology is widely used in medical applications owing to its characteristics of high resolution and very low radiation. However, manual NMR image segmentation is time-consuming and error-prone, which has led to the research on automatic NMR image segmentation technologies. Researchers tend to explore the ventricular NRM image segmentation to improve the accuracy of CVD diagnosis. In this study, based …
Seismic Performance Of Concrete-Filled Shs Column-To-Beam Connections With Slip-Critical Blind Bolts, Weifeng Jiao, Wei Wang, Yiyi Chen, Lip H. Teh
Seismic Performance Of Concrete-Filled Shs Column-To-Beam Connections With Slip-Critical Blind Bolts, Weifeng Jiao, Wei Wang, Yiyi Chen, Lip H. Teh
Faculty of Engineering and Information Sciences - Papers: Part A
© 2020 Elsevier Ltd This paper investigates the use of slip-critical blind bolts to connect I-beams to concrete-filled steel square hollow section (SHS) columns. The strength and stiffness of the resulting joints are determined experimentally for the purpose of classifying them according to the Eurocode. Their suitability for use in special moment frames is also assessed through cyclic bending tests. Three types of beam sections are tested, being a compact welded section, a reduced beam (flange) section, and a reduced beam section with concrete slab at the top. All tested joints are full strength according to the Eurocode, allowing the …
Microstructural Evolution Of Hybrid Aluminum Matrix Composites Reinforced With Sic Nanoparticles And Graphene/Graphite Prepared By Powder Metallurgy, Jiangshan Zhang, Qing Liu, Shufeng Yang, Zhixin Chen, Qiang Liu, Zhengyi Jiang
Microstructural Evolution Of Hybrid Aluminum Matrix Composites Reinforced With Sic Nanoparticles And Graphene/Graphite Prepared By Powder Metallurgy, Jiangshan Zhang, Qing Liu, Shufeng Yang, Zhixin Chen, Qiang Liu, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part A
© 2020 Chinese Materials Research Society The dispersion of ceramic nanoparticles is of significance to the microstructure and properties of particulate reinforced metal matrix composites. In this study, two hybrid enhancers, SiC-graphite and SiC-graphene nanosheets (GNSs), were incorporated into aluminum matrix composites using powder metallurgy. The dispersion of the reinforcements and microstructural evolution of the composites were characterized by using Scanning Electron Microscopy, X-Ray Diffraction, Transmission Electron Microscopy, and Raman spectroscopy. The results show that thin GNSs accelerated the deformation of the aluminum particles, and defects were introduced into the carbonaceous phases during the ball milling process. Al4C3 needles generated …
Hybrid Translation And Language Model For Micro Learning Material Recommendation, Jiayin Lin
Hybrid Translation And Language Model For Micro Learning Material Recommendation, Jiayin Lin
Faculty of Engineering and Information Sciences - Papers: Part A
As an emerging pedagogy, micro learning aims to make use of people’s fragmented spare time and provide personalized online learning service, for example, by pushing fragmented knowledge to specific learners. In the context of big data, the recommender system is the key factor for realizing the online personalization service, which significantly determines what information will be fmally accessed by the target learners. In the education discipline, due to the pedagogical requirements and the domain characteristics, ranking recommended learning materials is essential for maintaining the outcome of the massive learning scenario. However, many widely used recommendation strategies in other domains showed …
Thermionic Emission In Nodal-Ring Semimetals, Suguo Chen, Sunchao Huang, Wenye Duan, Wei Shi, C Zhang
Thermionic Emission In Nodal-Ring Semimetals, Suguo Chen, Sunchao Huang, Wenye Duan, Wei Shi, C Zhang
Faculty of Engineering and Information Sciences - Papers: Part A
© 2020 Author(s). We theoretically investigate the thermionic emission from nodal-ring semimetals. The thermionic emission is found to be anisotropic in the x- and y-directions. The anisotropic emission can be enhanced by increasing the radius of nodal-ring b. The main feature of nodal-ring semimetals not only results in anisotropic thermionic emission but also affects the value of thermionic emission current density (TECD). The TECD of the lower branch of the energy-momentum dispersion increases with b, while the TECD of the upper branch decreases with b. Unlike in conventional materials, the TECD in nodal-ring semimetals depends on Fermi energy that is …
Model-Free Adaptive Iterative Learning Control Of Melt Pool Width In Wire Arc Additive Manufacturing, Chunyang Xia, Zengxi Stephen Pan, Shiyu Zhang, Hui Jun Li, Yanling Xu, Shanben Chen
Model-Free Adaptive Iterative Learning Control Of Melt Pool Width In Wire Arc Additive Manufacturing, Chunyang Xia, Zengxi Stephen Pan, Shiyu Zhang, Hui Jun Li, Yanling Xu, Shanben Chen
Faculty of Engineering and Information Sciences - Papers: Part A
© 2020, Springer-Verlag London Ltd., part of Springer Nature. Wire arc additive manufacturing (WAAM) is a Direct Energy Deposition (DED) technology, which utilize electrical arc as heat source to deposit metal material bead by bead to make up the final component. However, issues like the lack of assurance in accuracy, repeatability and stability hinder the further application in industry. Therefore, a Model Free Adaptive Iterative Learning Control (MFAILC) algorithm was developed to be applied in WAAM process in this study. The dynamic process of WAAM is modelled by adaptive neuro fuzzy inference system (ANFIS). Based on this ANFIS model, simulations …
Effect Of Quantum Reflection Over The Barrier On Thermionic Refrigeration, Zeyu Zhang, Zelong Peng, Zhongshui Ma, C Zhang
Effect Of Quantum Reflection Over The Barrier On Thermionic Refrigeration, Zeyu Zhang, Zelong Peng, Zhongshui Ma, C Zhang
Faculty of Engineering and Information Sciences - Papers: Part A
© 2020 Author(s). We study the effect of quantum reflection over the barrier (ROB) in a thermionic cooling device. We find that the performance of refrigerators can be enhanced by the ROB effect if the bias voltage and the lattice thermal resistance of the semiconductor in the barrier region are both sufficiently high. Furthermore, the figure of merit Z T can be higher due to the ROB effect if the workfunction of the cathode is low and the lattice thermal resistance is high. The overall optimum Z T calculated with and without the ROB effect are 6.5 and 7.1, respectively. …
High Sensitivity Face Shear Magneto-Electric Composite Array For Weak Magnetic Field Sensing, Yun Lu, Zhenxiang Cheng, Jianguo Chen, Weihua Li, Shujun Zhang
High Sensitivity Face Shear Magneto-Electric Composite Array For Weak Magnetic Field Sensing, Yun Lu, Zhenxiang Cheng, Jianguo Chen, Weihua Li, Shujun Zhang
Faculty of Engineering and Information Sciences - Papers: Part A
© 2020 Author(s). A magnetic field sensor is designed and fabricated using a piezoelectric face shear mode Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT)/Metglas magneto-electric (ME) composite. An outstanding ME coupling coefficient up to 1600 V/(cm Oe) was experimentally achieved, being ∼50% higher than the value from the extensional PMN-PT/Metglas ME composite with the same volume. The detection limit was found to be 2 × 10-6 Oe for the DC magnetic field, while it was 2 × 10-8 Oe for the AC magnetic field. The sensitivity of the face shear mode PMN-PT/Metglas ME composite is about one order of magnitude higher than that of a …
Reachable Set Estimation For Neutral Markovian Jump Systems With Mode-Dependent Time-Varying Delays, Xiangli Jiang, Guihua Xia, Zhiguang Feng, Zhengyi Jiang
Reachable Set Estimation For Neutral Markovian Jump Systems With Mode-Dependent Time-Varying Delays, Xiangli Jiang, Guihua Xia, Zhiguang Feng, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part A
© 2020 John Wiley & Sons Ltd This study, under zero initial condition, aims to characterize the reachable set bound for a class of neutral Markovian jump systems (NMJSs) with interval time-varying delays and bounded disturbances. To begin with, the time-delays are considered to be mode-dependent while delay mode and system mode are different. By utilizing free-weighting matrix method and reciprocally convex combination technique, an ellipsoid-like bound is characterized for the concerned NMJS with completely known transition probabilities. Based on the provided analytical framework, the case of same delay mode and system mode is also handled. Then, benefitting from a …
Comparison Of A Laboratory-Scale Coke And A Pilot-Scale Coke From Matched Coal, Hannah Lomas, Richard Roest, Adam Wells, Tizshauna Thorley, Hui Wu, Zhengyi Jiang, Richard Sakurovs, Robert Fetscher, Xing Xing, Merrick Mahoney
Comparison Of A Laboratory-Scale Coke And A Pilot-Scale Coke From Matched Coal, Hannah Lomas, Richard Roest, Adam Wells, Tizshauna Thorley, Hui Wu, Zhengyi Jiang, Richard Sakurovs, Robert Fetscher, Xing Xing, Merrick Mahoney
Faculty of Engineering and Information Sciences - Papers: Part A
© 2020 Institute of Materials, Minerals and Mining. A coke produced using a custom-built sole-heated oven and a coke prepared in a pilot-scale oven from a matched coal, were compared using a range of analytical techniques. The aim of this comparison was to assess to what extent the small-scale sole-heated oven can successfully replicate the production of pilot-scale oven cokes, and thus be used to rapidly prepare and screen a wide range of cokes for particular characteristics, e.g. abrasion resistance. The techniques applied included conventional methods and novel methods developed by our research team. These included microstructural and microtextural analyses …
Towards Mr-Guided Electron Therapy: Measurement And Simulation Of Clinical Electron Beams In Magnetic Fields, R Kueng, Bradley M. Oborn, N Roberts, Trent Causer, M Stampanoni, P Manser, P Keall, M Fix
Towards Mr-Guided Electron Therapy: Measurement And Simulation Of Clinical Electron Beams In Magnetic Fields, R Kueng, Bradley M. Oborn, N Roberts, Trent Causer, M Stampanoni, P Manser, P Keall, M Fix
Faculty of Engineering and Information Sciences - Papers: Part A
© 2020 Associazione Italiana di Fisica Medica Purpose: In the current era of MRI-linac radiotherapy, dose optimization with arbitrary dose distributions is a reality. For the first time, we present new and targeted experiments and modeling to aid in evaluating the potential dose improvements offered with an electron beam mode during MRI-linac radiotherapy. Methods: Small collimated (1 cm diameter and 1.5 × 1.5 cm2 square) electron beams (6, 12 and 20 MeV) from a clinical linear accelerator (Varian Clinac 2100C) are incident perpendicular and parallel to the strong and localized magnetic fields (0–0.7 T) generated by a permanent magnet device. …
Strategic Positioning Of The Russian Far East Gold Mining Industry, Aleksei Sobolev, Peter Gibson, Gennadei Sekisov, Anton Andriushenko
Strategic Positioning Of The Russian Far East Gold Mining Industry, Aleksei Sobolev, Peter Gibson, Gennadei Sekisov, Anton Andriushenko
Faculty of Engineering and Information Sciences - Papers: Part B
© The Authors, published by EDP Sciences, 2020. The objectives of this paper is to investigate internal and external factors influencing the gold mining in Russian Far East. Justification of the methodological and practical recommendations as well as effective strategies which in full measure correspond to the range of economic and technical factors aimed to increase the effectiveness of gold mining industry in Russia are presented. In this paper, we analysed the current state and main development trends, identified strengths and weaknesses of the internal environment, as well as opportunities and threats of the external environment for the gold mining …
A Parallel Evolutionary Strategy For The Large-Scale Dynamic Optimal Reactive Power Flow, Chixin Xiao, Danny Sutanto, Kashem M. Muttaqi, Minjie Zhang
A Parallel Evolutionary Strategy For The Large-Scale Dynamic Optimal Reactive Power Flow, Chixin Xiao, Danny Sutanto, Kashem M. Muttaqi, Minjie Zhang
Faculty of Engineering and Information Sciences - Papers: Part B
© 2020 IEEE. This paper proposes a parallel evolutionary strategy to solve a large-scale dynamic optimal reactive power flow (ORPF) problem to minimize the transmission losses while ensuring that the power system constraints are met, by varying the voltage magnitude of generators, the transformer taps and all reactive power support, installed in the power system. The existing heuristic algorithms are time-consuming due to the large number of sequential calculations that need to be carried out. This paper proposes the use of a parallel evolutionary strategy to speed up the optimization of a large-scale ORPF problem based on the orthogonal design …
Dosimetric Optimization And Commissioning Of A High Field Inline Mri-Linac, Urszula Jelen, Bin Dong, Jarrad Begg, Natalia Roberts, Brendan Whelan, Paul Keall, Gary P. Liney
Dosimetric Optimization And Commissioning Of A High Field Inline Mri-Linac, Urszula Jelen, Bin Dong, Jarrad Begg, Natalia Roberts, Brendan Whelan, Paul Keall, Gary P. Liney
Faculty of Engineering and Information Sciences - Papers: Part B
© Copyright © 2020 Jelen, Dong, Begg, Roberts, Whelan, Keall and Liney. Purpose: Unique characteristics of MRI-linac systems and mutual interactions between their components pose specific challenges for their commissioning and quality assurance. The Australian MRI-linac is a prototype system which explores the inline orientation, with radiation beam parallel to the main magnetic field. The aim of this work was to commission the radiation-related aspects of this system for its application in clinical treatments. Methods: Physical alignment of the radiation beam to the magnetic field was fine-tuned and magnetic shielding of the radiation head was designed to achieve optimal beam …
Size Distribution Measurement Of Coal Fragments Using Digital Imaging Processing, Xiaohan Yang, Ting X. Ren, Lihai Tan
Size Distribution Measurement Of Coal Fragments Using Digital Imaging Processing, Xiaohan Yang, Ting X. Ren, Lihai Tan
Faculty of Engineering and Information Sciences - Papers: Part B
This paper focuses on the size distribution measurement of coal fragments by digital imaging processing. The fast and precise measurement of coal fragments, which is important to understand the crack propagation and energy dissipation process of coal failure, has not been achieved by previous research. In this paper, an image analysis method using MATLAB is proposed to measure fragment size distribution of coal fragments. The acquisition setup, analysis step and coding process for fragment size distribution measurement by digital imaging processing are introduced in detail. The statistical size distribution of coal fragments measured by image processing is compared with the …
The Structural, Electronic, And Optical Properties Of Ge/Si Quantum Wells: Lasing At A Wavelength Of 1550 Nm, Hongqiang Li, Jianing Wang, Jinjun Bai, Shanshan Zhang, Sai Zhang, Yaqiang Sun, Qianzhi Dou, Mingjun Ding, Youxi Wang, Dan Qu, Jilin Du, Chunxiao Tang, Enbang Li, Joan Prades
The Structural, Electronic, And Optical Properties Of Ge/Si Quantum Wells: Lasing At A Wavelength Of 1550 Nm, Hongqiang Li, Jianing Wang, Jinjun Bai, Shanshan Zhang, Sai Zhang, Yaqiang Sun, Qianzhi Dou, Mingjun Ding, Youxi Wang, Dan Qu, Jilin Du, Chunxiao Tang, Enbang Li, Joan Prades
Faculty of Engineering and Information Sciences - Papers: Part B
The realization of a fully integrated group IV electrically driven laser at room temperature is an essential issue to be solved. We introduced a novel group IV side-emitting laser at a wavelength of 1550 nm based on a 3-layer Ge/Si quantum well (QW). By designing this scheme, we showed that the structural, electronic, and optical properties are excited for lasing at 1550 nm. The preliminary results show that the device can produce a good light spot shape convenient for direct coupling with the waveguide and single-mode light emission. The laser luminous power can reach up to 2.32 mW at a …
Optimization Of Maintenances Following Proof Tests For The Final Element Of A Safety-Instrumented System, Aibo Zhang, Tieling Zhang, Anne Barros, Yiliu Liu
Optimization Of Maintenances Following Proof Tests For The Final Element Of A Safety-Instrumented System, Aibo Zhang, Tieling Zhang, Anne Barros, Yiliu Liu
Faculty of Engineering and Information Sciences - Papers: Part B
2019 The Authors Safety-instrumented systems (SISs) have been widely installed to prevent accidental events and mitigate their consequences. Mechanical final elements of SISs often become vulnerable with time due to degradations, but the particulars in SIS operations and assessment impede the adaption of state-of-art research results on maintenances into this domain. This paper models the degradation of SIS final element as a stochastic process. Based on the observed information during a proof test, it is essential to determine an optimal maintenance strategy by choosing a preventive maintenance (PM) or corrective maintenance (CM), as well deciding what degree of mitigation of …
Performance Of Ballast Influenced By Deformation And Degradation: Laboratory Testing And Numerical Modeling, Buddhima Indraratna, Ngoc Trung Ngo, Cholachat Rujikiatkamjorn
Performance Of Ballast Influenced By Deformation And Degradation: Laboratory Testing And Numerical Modeling, Buddhima Indraratna, Ngoc Trung Ngo, Cholachat Rujikiatkamjorn
Faculty of Engineering and Information Sciences - Papers: Part B
This paper presents a study on the deformation and degradation responses of railway ballast using large-scale laboratory testing and computational modeling approaches. A series of large-scale triaxial tests were carried out to investigate the ballast breakage responses under cyclic train loading subjected to varying frequencies, f=10-40 Hz. The role of recycled rubber energy-absorbing mats (REAMs) on reducing ballast breakage was also examined. Laboratory test results show that the ballast experiences significant degradation (breakage) and deformation, while the inclusion of REAMs can reduce the ballast breakage up to about 35%. Numerical modeling using the coupled discrete-continuum approach [coupled discrete-element method-finite-difference method …