Top 10 Engrxiv Papers Today in Engineering


2.049 Mikeys
#1. Numerical Modelling of Seabed Impact Effects on Chain and Small Diameter Mooring Cables
Chee Meng Low
Catenary mooring lines experience liftoff from and grounding on the seabed when undergoing large dynamic motions. Numerical line mooring models account for this interaction using various seabed models and it is known that the action of liftoff and grounding may lead to large dynamic tension fluctuations. These fluctuations may be spurious due to the inability of discretised mooring models to adequately account for the effect of the seabed on the mooring line. In this work, the root cause and conditions that lead to the production of the large dynamic tension fluctuations is determined. The effect of line discretisation and seabed model on the tension fluctuations is investigated using the widely used spring-mattress approach and a modified seabed reaction force model. An in-house mooring code was developed to perform these investigations. For code validation and benchmarking, and to illustrate the existence of the tension fluctuations problem due to nodal grounding in existing mooring line simulation codes, comparisons are made to...
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engrXiv: "Numerical Modelling of Seabed Impact Effects on Chain and Small Diameter Mooring Cables" - https://t.co/tRMMcg3b8Y #engineering
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Sample Sizes : None.
Authors: 1
Total Words: 18286
Unqiue Words: 3122

2.003 Mikeys
#2. Fabrication of Multi-material 3D Structures by the Integration of Direct Laser Writing and MEMS Stencil Patterning
Jeremy Reeves, Rachael K. Jayne, Lawrence Barrett, Alice E. White, David J. Bishop
The construction of a complex, 3D optical metamaterial challenges conventional nanofabrication techniques. These metamaterials require patterning of both a deformable mechanical substrate and an optically-active structure with ~200 nm resolution and precision. The soft nature of the deformable mechanical materials often precludes the use of resist-based techniques for patterning. Furthermore, FIB deposition approaches produce metallic structures with considerable disorder and impurities, impairing their optical response. In this paper we discuss a novel solution to this nanofabrication challenge -- the integration of direct laser writing and MEMS stencil patterning. We demonstrate a variety of methods that enable this integration and then show how one can produce optically-active, 3D metamaterials. We present optical characterization data on one of these metamaterials to demonstrate the viability of our nanofabrication approach.
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engrXiv: "Fabrication of Multi-material 3D Structures by the Integration of Direct Laser Writing and MEMS Stencil Patterning" - https://t.co/wjo13GjGvl #engineering
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Sample Sizes : None.
Authors: 5
Total Words: 3559
Unqiue Words: 1326

2.002 Mikeys
#3. Using Drive-by Health Monitoring to Detect Bridge Damage Considering Environmental and Operational Effects
William Locke, Justin Sybrandt, Ilya Safro, Sez Atamturktur
Drive-by Health Monitoring utilizes accelerometers mounted on commercial and civilian vehicles to gather dynamic response data that can be used to continuously evaluate the health of bridges faster and with less equipment than traditional structural health monitoring practices. Because vehicles and bridges create a coupled system, vehicle acceleration data contains information about bridge frequencies that can be used as health indicators. However, for drive-by health monitoring to be viable, variabilities in dynamic measurements caused by environmental and operational parameters, such as temperature, vehicle speed, traffic, and surface roughness need to be considered. In this paper, a finite element model of a simply supported bridge is developed considering the aforementioned variabilities and various levels of structural damage. Vehicle acceleration data obtained from the model is then transformed to the frequency domain and processed using a multi-layer neural network. This method is used to determine the relationships between...
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engrXiv: "Using Drive-by Health Monitoring to Detect Bridge Damage Considering Environmental and Operational Effects" - https://t.co/v6j3R9i56H #engineering
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Sample Sizes : None.
Authors: 4
Total Words: 11066
Unqiue Words: 3125

1.998 Mikeys
#4. Potential of Neural Networks for Structural Damage Localization
Miguel Abambres, Marília Marcy, Graciela Doz
Fabrication technology and structural engineering states-of-art have led to a growing use of slender structures, making them more susceptible to static and dynamic actions that may lead to some sort of damage. In this context, regular inspections and evaluations are necessary to detect and predict structural damage and establish maintenance actions able to guarantee structural safety and durability with minimal cost. However, these procedures are traditionally quite time-consuming and costly, and techniques allowing a more effective damage detection are necessary. This paper assesses the potential of Artificial Neural Network (ANN) models in the prediction of damage localization in structural members, as function of their dynamic properties – the three first natural frequencies are used. Based on 64 numerical examples from damaged (mostly) and undamaged steel channel beams, an ANN-based analytical model is proposed as a highly accurate and efficient damage localization estimator. The proposed model yielded maximum errors of 0.2...
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engrXiv: "Potential of Neural Networks for Structural Damage Localization" - https://t.co/L1xyWcfnQR #engineering
DataDCivilEng: https://t.co/lMIAas3uwG
AbambresM: https://t.co/7xE9Baf5sd
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Sample Sizes : [3]
Authors: 3
Total Words: 11899
Unqiue Words: 3381

1.997 Mikeys
#5. LITHIUM DOPED DOUBLE WALLED CARBON NANO-TUBE ELECTRICITY STORAGE CELL
Tim Walshaw
Many double walled carbon nano-tubes, the inner one intercalated with lithium atoms, can be used to construct an electricity storage cell of high capacity, easy to charge, and easy to use. Ideal for motor vehicles and multiple other uses.
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engrXiv: "LITHIUM DOPED DOUBLE WALLED CARBON NANO-TUBE ELECTRICITY STORAGE CELL" - https://t.co/jTAY0ai6Aj #engineering
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Sample Sizes : None.
Authors: 1
Total Words: 2765
Unqiue Words: 741

0.0 Mikeys
#6. Virtual Mechanical Testing from Low-Dose CT Scans Predicts Tibial Fracture Time to Union and Outperforms Subjective Outcomes Scoring
Peter Schwarzenberg, Hannah L. Dailey
Background: Quantitative outcomes assessment remains a persistent challenge in orthopaedic trauma. Although patient-reported outcomes measures (PROMs) and radiographic assessments such as RUST scores are frequently used, very little evidence has been presented to support their validity for measuring structural bone formation or biomechanical integrity. Methods: A sequential cohort of tibial shaft fracture patients was prospectively recruited for observation following standard reamed intramedullary nailing in a Level I trauma center. Follow-ups at 6, 12, 18, and 24 weeks included X-rays and completion of PROMs (EQ-5D and pain scores). Low-dose computed-tomography (CT) scans were also completed at 12 weeks. Scans were reconstructed in 3D and subjected to virtual mechanical testing via the finite element method to assess fracture limb torsional rigidity relative to intact bone. Results: Patients reported progressive longitudinal improvement in mobility, self-care, activity, and health over time, but the PROMs were not correlated with...
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Sample Sizes : None.
Authors: 2
Total Words: 5698
Unqiue Words: 2452

0.0 Mikeys
#7. A Novel Harmonic Current Control Algorithm
Ebrahimi
This paper presents a novel control algorithm for high-torque low-speed permanent magnet synchronous motors for direct drive applications. A new induced voltage based formulation of the electromagnetic torque is developed and a novel current control algorithm is designed to reduce the torque ripples which are originated from the flux harmonics. A prototype motor with relatively high induced voltage harmonics is designed and constructed and the experiment results of the Harmonic control algorithm are compared to the results of a conventional Field Oriented Control.
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Sample Sizes : None.
Authors: 1
Total Words: 3864
Unqiue Words: 1298

0.0 Mikeys
#8. Exploring the Economic, Environmental, and Travel Implications of Changes in Parking Choices due to Driverless Vehicles: An Agent-Based Simulation Approach
Corey D. Harper, Chris T. Hendrickson, Constantine Samaras
Fully driverless automated vehicles (AVs) could considerably alter the proximity value of parking, due to an AV’s ability to drop passengers off at their destination, search for cheaper parking, and return to pick up their occupants when needed. This study estimates the potential impact of privately-owned driverless vehicles on vehicle miles traveled (VMT), energy use, emissions, parking revenue, and daily parking cost savings in the city of Seattle, Washington from changes in parking decisions using an agent-based simulation model. Each AV is assumed to consider the cost to drive to each parking spot, the associated daily parking cost, and the parking availability at each location, and the AV ranks each choice in terms of economic cost. The simulation results indicate at the low penetration rates (5 to 25 percent AV penetration) AVs in downtown Seattle would travel an additional 3.5- 4.0 miles per day on average, and high penetration rates (50 to 100 percent AV penetration) would travel an additional 5.6-8.4 miles per day on...
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CostaSamaras: Wait until robocars start doing this all over town, and then they tell each other that parking enforcement vehicles are coming so they can move. The end of the unpriced public realm isn’t nigh, but it’s coming. Paper: https://t.co/PJ9CyWEUdZ https://t.co/BBbhH4Q0Ki
CostaSamaras: What happens when private robocars drop passengers off downtown & find free parking elsewhere? VMT goes up, & downtown space becomes available for housing, businesses, & parks. Policy can be proactive & people-centered. Our new paper led by Corey Harper: https://t.co/PJ9CyWEUdZ https://t.co/XVqHeT2kvx
engrXiv: "Exploring the Economic, Environmental, and Travel Implications of Changes in Parking Choices due to Driverless Vehicles: An Agent-Based Simulation Approach" - https://t.co/JrCCLr8zcX #engineering
MikeSalisbury78: AVs in downtown could lead to slightly higher VMT and energy use, CBD parking $ decreases and potential for new land use in CBD. https://t.co/ABFrZ79vAp via @OSFramework
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Sample Sizes : None.
Authors: 3
Total Words: 13285
Unqiue Words: 2727

0.0 Mikeys
#9. Influence of insulation defects on the thermal performance of walls. An experimental and numerical investigation
Iole Nardi, Stefano Perilli, Tullio de Rubeis, Stefano Sfarra, Dario Ambrosini
The addition of insulating layers on vertical walls of buildings is a common practice for providing a higher thermal insulation of the envelope. Workmanship defects, however, might influence the effectiveness of such insulation strategy. Damaged materials, incorrect installation, use of aged or weathered materials might alter the capability of reducing heat transfer through the envelope, whether vertical or sloped. In this work, drawbacks caused by the wrong installation of insulating material and by damaged material are assessed. A specimen wall was investigated by experimental and numerical approaches, the latter carried out by using COMSOL Multiphysics®. Results are compared and discussed.
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engrXiv: "Influence of insulation defects on the thermal performance of walls. An experimental and numerical investigation" - https://t.co/clj2VyHhky #engineering
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Sample Sizes : None.
Authors: 5
Total Words: 7045
Unqiue Words: 2744

0.0 Mikeys
#10. The impact of climatic extreme events on the feasibility of fully renewable power systems: a case study for Sweden
Stefan Höltinger, Johann Baumgartner, Christian Mikovits, Johannes Schmidt, Berit Arheimer, Göran Lindström, Elisabeth Wetterlund
Future energy systems with high shares of intermittent renewables will be stressed by climatic extreme events. We assess the frequency, duration, and magnitude of such extreme residual load events with a share of VRE generation of about 50% for the case of Sweden. For our analysis, we use 29 years of river runoff and of wind power and PV generation simulated from physical models. Hourly load is simulated from temperature data with a time series model. The resulting time series are combined with historic capacity and ramping restrictions of hydro and thermal power plants in an optimization model to minimize extreme residual load events. Results indicate that under high VRE shares climatic extreme events affect even highly flexible power systems as the Swedish one. Replacing current nuclear power capacities by wind power results on average in three extreme residual load events per year. These events are partly linked to the observation that wind speeds are likely below seasonal average in very cold weather conditions. Deploying PV...
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engrXiv: "The impact of climatic extreme events on the feasibility of fully renewable power systems: a case study for Sweden" - https://t.co/IIXiU5iIUh #engineering
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Sample Sizes : None.
Authors: 7
Total Words: 3235
Unqiue Words: 1719

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