bluuebunny/crossref_metadata_2025_split huggingface dataset:
Identification of wave drift force QTFs for the INO WINDMOOR floating wind turbine based on model test data and comparison with potential flow predictions
Authors: Fonseca Nuno , Thys Maxime , Berthelsen Petter Andreas 
Published: September 2021

Abstract
The paper presents a comparison between empirical and numerical quadratic transfer functions (QTFs) of the horizontal wave drift loads on the INO WINDMOOR floating wind turbine. The empirical QTFs are determined from cross bi-spectral analysis of model test data obtained in an ocean basin. Validation of the identified QTF is provided by comparing low frequency motions reconstructed from the empirical QTF with measurements. The numerical QTFs are calculated by a panel code that solves the wave-structure potential flow problem up to the second order. Systematic comparisons between numerical and empirical QTFs allows identification of tendencies of empirical QTFs and limitations of the second order potential flow predictions. The study is limited to hydrodynamic loads from waves only, i.e. without current. For small seastates, the results indicate that the second order potential flow predictions of the surge QTFs agree quite well with the wave drift coefficients identified empirically from the model test data. For moderate and high seastates, second order predictions underestimate the surge wave drift coefficients for all compared diagonals of the QTFs. The discrepancies between predictions and empirical coefficients are not small, especially at the lower frequency range (below around 0.10 Hz) where the potential flow wave drift forces tend to zero.
OC6 semisubmersible response to waves in offset positions caused by constant thrust loads
Authors: Gueydon Sébastien , Bayati Ilmas , Ridder Erik-Jan de 
Published: September 2021

Abstract
In 2019, a semisubmersible floating wind foundation was tested in the Concept Basin of MARIN in waves and under several levels of constant thrust. This paper compares the motion of the floater and the tensions in its mooring lines in waves under different levels of thrust. The end goal of this work is to present experimental results of the response of a floating wind turbine semisubmersible under the combined effects of waves and constant thrust. As these new experiments were focused on the hydrodynamic response of the floater in its offset position, their results represent reference data for the validation of numerical tools that account for this offset in the calculation of the hydrodynamic loading and response.
Verification of SIMPACK-MoorDyn coupling using 15 MW IEA-Wind reference models Activefloat and WindCrete
Authors: Mahfouz M Y , Roser T , Cheng P W 
Published: September 2021

Abstract
The modelling of mooring lines and their behaviour is essential for the research and development of Floating Offshore Wind Turbines (FOWTs). Mooring lines’ dynamics impact the platform motions and hence the loads on the turbine’s blades. Therefore, coupling the mooring lines’ dynamics in the aero-hydro-servo-elastic models is a necessity. In this paper we couple Moordyn to SIMPACK which is a multibody system simulation software. Afterwards, we verify the coupling by comparing the results to OpenFAST v2.1. The IEA Wind 15 MW reference wind turbine coupled to Activefloat and WindCrete floaters, introduced in COREWIND project, are used for the verification process. The two floaters have two different mooring configurations; WindCrete is a spar floater with a symmetric delta shape catenary mooring line system, while Activefloat is a semi-submersible with simple catenary mooring configurations. During the verification, both steady and dynamic load cases are used for the responses of two mooring systems. After the verification, the coupling procedure is open access and can be used to model new innovations in FOWTs using SIMPACK benefiting from the tool’s flexibility.
Assessment of mooring configurations for the IEA 15MW floating offshore wind turbine
Authors: Pan Qi , Mahfouz Mohammad Youssef , Lemmer Frank 
Published: September 2021

Abstract
To achieve cost-effective deployment of floating offshore wind farms, it is necessary to reduce mooring costs of Floating Offshore Wind Turbines (FOWTs). Beyond the cost, in terms of environmental impact, the seabed disrupted area due to mooring lines should be mitigated with care. The objective of this paper is to shed light on design parameters for cost- effective and low-footprint mooring configurations for FOWTs using coupled dynamic analyses. A design space is explored for mooring configurations with different pretension ratios, laid down length ratios and clump weight sizes. Ultimate and fatigue load cases are simulated in OpenFast to compute the floater motions, mooring line tensions and fatigue damage. With constant pretension ratio of 0.15 and adding clump weights of 40t, mooring line length, mooring footprint and peak tension can be reduced by 14%, 15% and 9% respectively, while maximum surge and fatigue damage increase by 25% and 12% respectively. This paper will serve as a basis for further work on mooring design in the EU H2020 funded project COREWIND and provide a practical reference for the mooring system design for FOWTs.
Suspended cable model for layout optimisation purposes in floating offshore wind farms
Authors: Rapha J I , Domínguez J L 
Published: September 2021

Abstract
The cable layout optimisation for floating offshore wind farms is a complex task due to the number of elements involved and their nature, such as dynamic cables with buoyant sections. The first step is defining a model of the suspended cables that connect wind turbines between them or to cables on the seabed (risers). A lumped mass model and the finite element method are used to find the static position and mechanical stresses of the cables, keeping a balance between computational time and the quality of the results. The model allows the inclusion of standard ancillary equipment such as bend stiffeners, buoyancy modules, clamps and tethers in order to simulate multiple configurations: double hanging, single hanging (catenary), lazy wave, steep wave and tethered wave. The external actions considered are marine growth and currents and the main cable properties are taken into account to calculate its weight, buoyancy, tensions, moments and drag forces. The information obtained after the simulation includes cable tensions, curvature, laid and suspended lengths and tether tension, when applicable. Next steps include the optimisation of the suspended cables and the full network in the farm.
Impact of vessel logistics on floating wind farm availability
Authors: Trueba Virginia , Rodríguez-Luis Álvaro , Fernández-Ruano Sergio , Guanche Raul 
Published: September 2021

Abstract
This paper presents a study of the impact of the Operations and Maintenance (O&M) vessel logistics over the power availability of an Offshore Wind Farm. In particular, the vessel size and availability are considered. The study is performed with a life-span simulator, based on historical metocean data, walk-to-walk characterization based on a frequency domain hydrodynamic modelling of multibody systems, wind farm fault simulator (based on a catalogue of more than 1800 faults) and an algorithm to reproduce the O&M intelligence (i.e. sea transportation, workability, among others). The frequency domain model is applied on an hourly basis considering the specific significant wave height, peak period, peak enhancement factor, mean heading, directional spreading, and a wave-by-wave strategy is used to find if personnel transfer and workability criteria are met. The WindFloat Atlantic wind farm, located off the coast of Viana do Castello (Portugal), was chosen together with the TRL+ project semi-submersible platform and the 10MW turbine as a reference case. Different vessel logistics options are compared, including full vessel availability and several options of waiting times. The power availability changes among the different cases of study could be compared with the cost changes, optimizing the LCOE (Levelized Cost of Energy) of the wind farm. The presented study is a valuable example of the potential of the proposed O&M simulation model as an optimization tool.
Design of die adjustment component vector decomposition method for metal screw forming
Authors: Wen C C , Chiu C H 
Published: September 2021

Abstract
This research focuses on the punch case adjustment vector decomposition problem of metal screw forming machines that occurred frequently in fastener manufacturing. The dimension component vectors of screw forming center axial line misalign for die adjustment were often decided by human experience currently and the adjusted results were not always be satisfied. It is a difficult problem to analyze the punch die adjust component vector from screw specific shape measurement information. This research integrates rotation axial optical measurement instrument and die adjustment mechanical specification information of forming machine then using the proposed sampling process so that the adjustment component vectors with respect to the punch case can be decomposed. The result of this research provides the adjustment guidance that includes main items of misalignment component vector. A practical verification is also demonstrated in this paper by using a type of screw forming machine for showing the feasibility of the designed die adjustment method.
Fuzzy tree classification system for fault diagnosis on Ion implanter
Authors: Horng S C , Lin Y L 
Published: September 2021

Abstract
Ion implanter is critical to modern integrated-circuit (IC) manufacturing. Ion implanter requires a long process due to low acceleration and high concentration process, which results in low productivity and becomes a bottleneck in the semiconductor fabrication. Furthermore, the wafer is not re-workable if existing error operation either caused by the operator or the machine. Therefore, it is important to develop a real-time fault detection system to minimize the probable down time of the ion implanter. In this work, a real-time fault detection system, which is based on the Fuzzy Tree Classification Systems (FTCS), is proposed to monitor the operation of the Eaton NV6200A/AV ion implanter. Two datasets, the 26-recipe and the 42- recipe cases, provided by a renowned wafer foundry in Taiwan were used to test the performance of the proposed FTCS. The datasets were obtained through the SECS-II interface. Test results demonstrate that the proposed FTCS can work real-time for fault detection of the Eaton NV6200A/AV ion implanter.
Robust optimum design of maximum power point tracker for photovoltaic power generation systems
Authors: Wu R C , Wang J L , Lee H Y , Guo J J , Chang E C 
Published: September 2021

Abstract
The photovoltaic array’s power-voltage curve usually appears multiple peaks in the presence of partial occlusion and fault conditions, and the habitual maximum power point tracking (MPPT) algorithm is not easy to discover the MPP of the global space, thus falling into the local range, which extremely decreases the efficiency of the photovoltaic power generation system. In this paper, a robust optimum design technology employing an enhanced terminal attractor (ETA) and a monkey-king genetic algorithm (MKGA) are put forward. The proposed technology can be adopted for the maximum power point tracker of the photovoltaic power generation system, therefore yielding fast limited-time convergence and global extremum. The proposed photovoltaic power generation system is also implemented on the basis of Texas Instruments digital signal processor, to achieve the improvement of the tracking speed and good performance in the transient as well as steady-state. Simulation and experimental results have been provided to demonstrate the virtue of the proposed technology.
Study on pre-acceleration characteristics of servo motor applied on stamping die cushion
Authors: Fann K J , Peng B H 
Published: September 2021

Abstract
In this study, a servo motor controller having only the mutually exclusive switching function between velocity and force control is used to set up a servo mechanical die cushion to explore the technology of force control that can enable the cushion to obtain the pre-acceleration function. Under different torque settings of the servo motor, the final velocity and the travel stroke of the die cushion for a certain time duration have been investigated for each response surface. A design scheme to determine the setting parameters for the pre-acceleration of the die cushion, such as the torque and the time duration, in which its both response surfaces of the velocity and the stroke are used, is thus proposed and verified by examples. The results show that the design scheme is indeed feasible and would be available for corresponding technicians’ reference.
A design of flyback switched-mode power supply with softswitching using the UC3842 controller
Authors: Huang C W , Liang J M , Hsu W T , Yang C C 
Published: September 2021

Abstract
The flyback switched-mode power supply is widely used in various electrical equipments due to its high efficiency and small size. This article is used UC3842 as the core control chip to design a flyback switched-mode power supply. The design includes the input of 36∼48V and an output of 12V and introduces a soft-switching design. The trigger signal of the next cycle arrives after the switching voltage drops to zero and realizes zero voltage switching (ZVS) to reduce switching losses. At the same time, single-ended flyback switching circuits, feedback circuits, and RCD clamp circuits are designed. The simulation result is shown the accuracy for the output voltage is within 1.08%, as well as the ripple factor is below 0.011%.
A novel string-bead EDM mechanism for dressing of the conformal cooling channel fabricated by the SLM-additive manufacture
Authors: Hsue Albert W J , Pan Y D , Lu L W 
Published: September 2021

Abstract
The conformal cooling channel (CCC) fabricated by the SLM method is a unique technology contributed to plastic molds by additive manufacture technology (AM). This paper proposes a novel electrical discharge machining (EDM) mechanism to trim the surface of the inner channel made of the selective laser melting (SLM -AM) and assembles a new string-bead tool, a guide-wheel set, a wire tension adjustment mechanism, and innovative electrode design. The experiments verify the EDM machinability and stability of the driving mechanism in the channel and investigate the feasible EDM parameters. As a result, this method can completely dress a 30mm straight channel with a diameter expansion of about 10%. This mechanism effectively trims the contour into a flat and even smooth tube and the taper to 38/30000, from the entrance to the exit. After EDM dressing, the surface roughness is reduced from the original 15-26 μm to 5.9 μm Ra. But some sort of bamboo-nuts overcutting occurred around the apex, due to the string tension and stumbling of tool electrode motion.
Process design and finite element analysis of multi-station two-roller cassette hot rolling for aluminum alloy 6061 wire
Authors: Ho C J , Yu C H , Kao C Y , Sheu J J 
Published: September 2021

Abstract
In this paper, a round-oval-round roller cassette wire rolling process of the aluminum alloy 6061 was studied for the process and the roller design evaluation. The elliptic groove of roller was designed for the stand of oval cross-sectional profiles. The billet diameter for this 10- stand rolling process simulation is 20mm. The diameters for the round cross-section profile stands are 16mm,12.8mm,10.2mm,8.2mm, and 6mm, respectively. The forming conditions for the CAE simulation is 400 °C for billet temperature, 0.45 for the constant shear friction factor, 20mm/s for the initial rolling speed. The CAE (Computer Aided Engineering, CAE) results had shown the maximum dimension deviation of the billet is less than 0.25 mm at the location of the roller gap and almost perfect match at the other locations. The maximum principal stress distribution on the cross section had shown a two third area was deformed under the rolling process. The CAE results had demonstrated the proposed process and die design was able to make the smaller wire with good geometrical accuracy without breaking the wire during the rolling process because of the more uniform stress distribution at the cross section of wire.
A novel automated guided vehicle for guidance applications
Authors: Lai Y L , Lai Y K , Lan L C , Zheng C Y , Chen S C , Tseng L W 
Published: September 2021

Abstract
In recent years, as a result of the significant development of information and communications technology, people have been paying much attention to automated guided vehicles (AGVs). In the ongoing global coronavirus disease 2019 (COVID-19) pandemic, hospital services have been seriously impacted. In the severe medical situation in hospitals, there is a serious shortage of human resources. This paper presents a novel automated guided vehicle (AGV) for guidance and service. The AGV is comprised of a microcontroller unit (MCU), a power unit, a human sensing unit, a collision warning unit, and a path sensing unit. The motion speed of the AGV and the distance between the AGV and the person being guided are determined by the MCU, the power unit, sensors, and an algorithm. The collision warning unit comprises three ultrasonic sensors and an infrared sensor in the front of the AGV in order to avoid obstacles. The trajectory results of the planned and actual paths are in good agreement. The AGV provides safe and effective guidance for people moving towards their destination. The AGV achieves excellent guidance results and shows great potential for guidance applications in hospitals.
Vision system based on deep learning for product inspection in casting manufacturing: pump impeller images
Authors: Taweelerd S , Chang C C , Tzou G Y 
Published: September 2021

Abstract
Products inspection is important issues in casting manufacture, because it is the final process before sending products to customers. To prevent a mistake from human operating error, vision systems are widely applied into this process nowadays. However, these systems still have some disadvantages which are sensitive to lightning and setup conditions. In this paper, the proposed approach for products inspection of submersible pump impeller images by the vision system based on deep learning with convolutional neural network architecture for casting manufacture is significant. It achieves the high accuracy of results as 99.7% on the top view of submersible pump impeller images dataset and requires less computational power and time. Moreover, it takes only 56.87 milliseconds for predicting one image. For proposing more details about this research, the submersible pump impeller images dataset is firstly presented. Subsequently, convolutional neural network, methods, evaluation and results are presented. Finally, all works in this study are summarized.
Investigation and Analysis of Renewable Energy from Bio and Solid Waste
Authors: Sakthivel M. , Arun A. , Hussainali E. Akram , Balamurugan G. 
Published: September 2021

Abstract
This investigation explores the possibility of utilizing bio and solid waste to produce power as renewable energy in every residential house. Fossil fuels are depleting very fast and environmental pollution is also caused due to their combustion. An effort is taken to generate electric power by the high combustion rate methane gas released by the bio and solid wastes from the residence. Anaerobic digestion is adopted to produce methane gas from the waste dumped in any house. This methane gas is made to run a single cylinder diesel engine coupled to a single phase alternator. Power thus generated will be sufficient to any single residential house.
Pressure-dependent joint elastic–electrical properties in brine-saturated artificial sandstones with aligned penny-shaped cracks—Part I: Experimental results
Authors: Han Tongcheng , Yan Han , Li Bo , Fu Li-Yun 
Published: September 2021

SUMMARY
Elastic and electrical properties can be jointly interpreted for better characterizations of rocks with cracks that are common in geological rocks. However, the cross-property relationship between the elastic and electrical properties of cracked rocks, which forms the key to the successful joint elastic–electrical interpretation, remains poorly understood. We investigate the pressure effects on the joint elastic–electrical properties in brine-saturated artificial sandstones with aligned non-interacting penny-shaped cracks that are far from percolation. We measured and compared the anisotropic electrical conductivity and ultrasonic velocity in the artificial sandstones with and without aligned cracks under applied effective stress from 5 to 50 MPa. We showed that the existence of aligned cracks significantly enhanced the elastic and electrical anisotropies of the rocks, and the difference in the elastic and electrical anisotropies between the cracked and intact samples reduced as the effective stress increased. We also showed that the pressure-dependent electrical conductivity and ultrasonic velocity exhibited strong linear correlations in both the intact and cracked samples cored in different directions, and a difference existed in the slopes between the samples with and without aligned cracks. The distinct contributions of the pressure-induced deformation of cracks to the anisotropic elastic and electrical properties, as well as their different sensitivity to the cracks, were found to plausibly explain the observed experimental results. Theoretical modelling for quantitative interpretation of the experimental data is presented in a companion paper.
Interference in Ion-Selective Electrodes Due to Proteins and Lipids
Authors: Datta Sudip Kumar , Chopra Parul 
Published: September 2021

Abstract

Background
Ion-selective electrodes (ISE) have become the mainstay of electrolyte measurements in the clinical laboratory. In most automated analyzers used in large diagnostic laboratories, indirect ISE (iISE) -based electrolyte estimation is done; whereas direct ISE (dISE) -based equipment are mostly used in blood gas analyzers and in the point-of-care (PoC) setting.

Content
Both the techniques, iISE as well as dISE, are scientifically robust; however, the results are often not interchangeable. Discrepancy happens between the two commonly due to interferences that affect the two measuring principles differently. Over the last decade, several studies have reported discrepancies between dISE and iISE arising due to abnormal protein and lipid contents in the sample.

Summary
The present review endeavors to consolidate the knowledge accumulated in relation to interferences due to abnormal protein and lipid contents in sample with the principal focus resting on probable solutions thereof.