"parallel wire strands" and “location”
122211066
A simplified contact friction methodology for modeling wire breaks in parallel wire strands
A simplified semi analytical contact friction approach is proposed to study the load transfer between tightened parallel steel wires, commonly used in suspension bridge main cables. Some of these wires tend to break at sporadic locations due to corrosion and/or material defects. However, owing to friction, in the vicinity of the break the load is distributed among neighboring wires and at a further distance away from the break, the broken wires recover partially their load carrying capacity. To model the load transfer due to friction, elasto perfectly plastic springs are placed at the contact points between the wires. These springs have varying yielding force values, depending on their proximity to the clamping loads which are determined from an analytical solution to a point load (Flamant's solution in 2D and Boussinesq's solution in 3D) The model is validated on 2D and 3D simpler problems by comparing the behavior to a reference solution obtained from a full contact analysis. Studies on various sized wire strands, breaking at a random wire sequence and at different locations, show the redistribution of the stresses between neighboring wires and the overall nonlinear load loss response of the system. Furthermore, to overcome the storage and speed limitations of serial computers, the method is implemented on a parallel computer architecture and the number of linear/nonlinear iterations, CPU time and parallel scalability are reported.
Arturo Montoya Haim Waisman Raimondo Betti
114458277
BLUE Care: A Cooperative Location Network for Handicapped Persons
Abstract Many dependents such as children, elderly or disabled people get lost or missing, but as handicapped people, they often lack the skills to protect themselves, and tutors cannot keep their dependents in sight all of the time. Therefore, the challenge to be tackled in this paper is to develop a dependents' cooperative location network over which tutors could monitor the dependents' positions in real time, giving them more freedom to safely roam within public spaces. Not only in open spaces such as crowded parks or streets, but also inside buildings such as city malls, museums or nursing homes. The aim of this paper is twofold, to create a cooperative and dynamic network of tutors over which monitor the position of their dependents by means of standardized technologies, and to understand how the physical environment could influence handicapped people's activities by means of behavioral analysis in public spaces.
Alfonso Bahillo Luis Enrique Diez Ander Arambarri
216682577
Wind Turbine Surface Damage Detection by Deep Learning Aided Drone Inspection Analysis
Timely detection of surface damages on wind turbine blades is imperative for minimizing downtime and avoiding possible catastrophic structural failures. With recent advances in drone technology, a large number of high resolution images of wind turbines are routinely acquired and subsequently analyzed by experts to identify imminent damages. Automated analysis of these inspection images with the help of machine learning algorithms can reduce the inspection cost. In this work, we develop a deep learning based automated damage suggestion system for subsequent analysis of drone inspection images. Experimental results demonstrate that the proposed approach can achieve almost human level precision in terms of suggested damage location and types on wind turbine blades. We further demonstrate that for relatively small training sets, advanced data augmentation during deep learning training can better generalize the trained model, providing a significant gain in precision.
A S M Shihavuddin Xiao Chen Vladimir Fedorov Anders Christensen Nicolai Andre Brogaard Riis Kim Branner Anders Bjorholm Dahl Rasmus R Paulsen
53683454
ADVANCED FAULT LOCATION IN COMPENSATED DISTRIBUTION NETWORKS
This work describes the design, implementation and evaluation of a novel fault location system for compensated networks. The work is performed as a part of the ongoing EU FP7 project called DICERN, involving five distribution network operators and several manufacturers and research institutes in Europe. In order to achieve its main goal of finding optimal level of intelligence in distribution grids the demonstration sites play a key role in achieving the central goals of the project. The aim of the Swedish demonstration is to gain knowledge on smart grid network operations and find a cost effective solution for monitoring the medium voltage (MV) network using "simple" sensors. The main objective is to geographically pinpoint faults in the distribution network and furthermore to evaluate the functionality of MV monitoring for fast and reliable fault identification and indicating distance to faults.
Fredrik Carlsson Nicholas Etherden Anders Kim Johansson Daniel Wall Axel Fogelberg Erica Lidstrom
219167062
Artificial intelligence together with mechanical imaging in mammography
Artificial intelligence (AI) applications are increasingly seeing use in breast imaging, particularly to assist in or automate the reading of mammograms. Another novel technique is mechanical imaging (MI) which estimates the relative stiffness of suspicious breast abnormalities by measuring the distribution of pressure on the compressed breast. This study investigates the feasibility of combining AI and MI information in breast imaging to provide further diagnostic information. Forty six women recalled from screening were included in the analysis. Mammograms with findings scored on a suspiciousness scale by an AI tool, and corresponding pressure distributions were collected for each woman. The cases were divided into three groups by diagnosis; biopsy proven cancer, biopsy proven benign and non biopsied, very likely benign. For all three groups, the relative increase of pressure at the location of the finding marked most suspicious by the AI software was recorded. A significant correlation between the relative pressure increase at the AI finding and the AI score was established in the group with cancer (p=0.043) but neither group of healthy women showed such a correlation. This study suggests that AI and MI indicate independent markers for breast cancer. The combination of these two methods has the potential to increase the accuracy of mammography screening, but further research is needed.
Other Conferences
Anna Bejno Gustav Hellgren Alejandro Rodriguez-Ruiz Predrag R Bakic Sophia Zackrisson Anders Tingberg Magnus Dustler
135457956
Microgrid protection based on principle of fault location
Island capable microgrids can potentially enhance the efficiency of distributed generations. In general, protection schemes in traditional distribution network cannot meet the requirements of microgrid internal protection. In order to solve the problem, this paper proposes the positive sequence fault component of current as the starting criterion. And a graph model describing the overall structure of a microgrid is established. The information about fault currents, including amplitude and direction, is acquired to locate fault branch. Furthermore, a new matrix algorithm is used to locate the fault point, so that the fault can be isolated. Finally, a microgrid model is simulated in the PSCAD/EMTDC software environment to illustrate the validity of fault location principle in microgrid protection. (c) 2015 Institute of Electrical Engineers of Japan. Published by John Wiley Sons, Inc.
Longhua Mu Non-member Haijuan Han Non-member B K Singh Non-member and Wenming Guo Non-member
73596759
A study of the location of the entrance of a fishway in a regulated river with CFD and ADCP
Simulation driven design with computational fluid dynamics has been used to evaluate the flow downstream of a hydropower plant with regards to upstream migrating fish. Fieldmeasurements with an Acoustic Doppler Current Profiler were performed, and the measurements were used to validate the simulations. The measurements indicate a more unstable flow than the simulations, and the tailrace jet from the turbines is stronger in the simulations. A fishway entrance was included in the simulations, and the subsequent attraction water was evaluated for two positions and two angles of the entrance at different turbine discharges. Results show that both positions are viable and that a position where the flow from the fishway does not have to compete with the flow from the power plant will generate superior attraction water. Simulations were also performed for further downstream where the flow from the turbines meets the old river bed which is the current fish passage for upstream migrating fish. A modification of the old river bed was made in the model as one scenario to generate better attraction water. This considerably increases the attraction water although it cannot compete with the flow from the tailrace tunnel.
Anders Andersson D E Lindberg Elianne M Lindmark Kjell Leonardsson Patrik Andreasson Hans LundqvistH Lundqvist T S Lundstrom
111341304
Autonomous Cell Based Storage Location Assignment Strategy in Print Production Environments
Sudhendu Rai and Ranjit Kumar Ettam
55561672
Towards location literacy: Finding and documenting preliminary guidelines for designing location based audio
Several reports indicate that a rising number of users are doing most of their web surfing from a mobile, hand held device (see, e.g. (Smith, 2012) These are devices with many sensors, among them positioning systems. Positioning systems for laptop computers are also becoming widespread. Gunnar Liestol has called this the rise of sensory media (Liestol, Doksrod, Ledas, Rasmussen, 2012) We believe location aware web sites will be common, and that more knowledge on how to write "situated texts" is needed. This paper is an attempt to gather some experience with locationaware texts in the form of simple guidelines for authors working in locationaware web services.
Anders Fagerjord
220687946
Location Awareness, Orientation and Navigation: Lessons Learned from the SmartInside Project
This paper presents four studies on indoor/outdoor localization, orientation and navigation in the context of the European SmartInside project. The findings of the studies are outlined and remaining research questions are described.
Anders J Bouwer Arnoud Visser Frank Nack Bas Terwijn