Scratch defects is occur due to impact drop and friction between the roller and slab in the conventional hot rolling method. The Flying Touch method is one of the proposed methods to improve the scratch defects. Flyin...
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Scratch defects is occur due to impact drop and friction between the roller and slab in the conventional hot rolling method. The Flying Touch method is one of the proposed methods to improve the scratch defects. Flying Touch method is available to soft touch between the rollers and the slab. Because roller is unfixed and flexible. And Flying Touch method is proposed synchronization of the rollers' angular velocity and the slab's surface velocity. In this paper, a simulator was designed to apply and verify the Flying Touch method. After, the actual implementation was velocity synchronization of Flying Touch method in the designed simulator. Performance of scratch reduction evaluated comparative experiment to velocity de-synchronization and velocity synchronization of Flying Touch method.
Climate change causes changes at the beginning of the rainy season and the dry season. In Microhydro planning, determining the rainy season's right start is very important to determine the energy potential. The be...
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We proposed the Heterogeneous Ant Colony Optimization (HACO) algorithm to solve the global path planning problem for autonomous mobile robot in the previous paper. The HACO algorithm was modified and optimized to solv...
We proposed the Heterogeneous Ant Colony Optimization (HACO) algorithm to solve the global path planning problem for autonomous mobile robot in the previous paper. The HACO algorithm was modified and optimized to solve the global path planning problem unlike the conventional ACO algorithm which was proposed to solve the Traveling Salesman Problem (TSP) or Quadratic Assignment Problem (QAP). However, there is a common shortcoming in the ACO algorithms for global path planning, including HACO algorithm. Ants carry out the exploration task relatively well around the starting point. On the other hand, they are hindered in their work as they approached the goal point, because they are attracted by the intensity of heuristic value and the accumulated pheromone while the ACO algorithm works. As a result, they have a strong tendency not to explore and most of them follow the path that found in the beginning of the search. This could cause the local optimal solutions. Thus, we propose a way to solve this problem in this paper. It is the Bilateral Cooperative Exploration (BCE) method. The BCE is the idea that performs the search task again by changing the goal point into the starting point and vice versa. The simulation shows the effectiveness of the proposed method.
In this study, we propose a methodology for automating earthmoving tasks using autonomous excavators and dump trucks, with an aim to enhance adaptability in response to environmental changes. Our methodology involves ...
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User localization is one of the key technologies for mobile robots to successfully interact with humans. Among various localization methods using radio frequency (RF) signals, time of arrival (TOA) based localization ...
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User localization is one of the key technologies for mobile robots to successfully interact with humans. Among various localization methods using radio frequency (RF) signals, time of arrival (TOA) based localization is popular since the target coordinates can be directly calculated from the accurate range measurements. In complex indoor environment, however, RF ranging-based localization is quite challenging since the range measurements suffer not only from signal noise but also from signal blockages and reflections. A set of range measurements taken in complex indoor environment verifies that almost all measurements are non-line-of-sight (NLOS) ranges which have striking difference to the line-of-sight (LOS) distances. These NLOS range measurements make severe degradation in the accuracy of trilateration based localizations if used without any compensation. In this paper we propose a particle filter-based localization algorithm which utilizes indoor geometry from a given map to estimate the NLOS signal path and compensates for the range measurements. The algorithm is verified with experiments performed in real indoor environments.
In this paper, a vibration-assisted needle insertion technique has been proposed in order to reduce needle-tissue friction. The LuGre friction model was employed as a basis for the current study and the model was exte...
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ISBN:
(纸本)9781467363563
In this paper, a vibration-assisted needle insertion technique has been proposed in order to reduce needle-tissue friction. The LuGre friction model was employed as a basis for the current study and the model was extended and analyzed to include the impact of high-frequency vibration on translational friction. Experiments were conducted to evaluate the role of insertion speed as well as vibration frequency on frictional effects. In the experiments conducted, an 18 GA brachytherapy needle was vibrated and inserted into an ex-vivo soft tissue sample using a pair of amplified piezoelectric actuators. Analysis demonstrates that the translational friction can be reduced by introducing a vibratory low-amplitude motion onto a regular insertion profile, which is usually performed at a constant rate.
Formaldehyde is a ubiquitous contaminant in the indoor environment that is both a carcinogen and irritant. The goal of this project is to develop a smartphone-based app for use by citizen scientists or researchers tha...
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This paper presents a numerical model of a morphing wing supporting the development of a biologically inspired vehicle capable of aerial and aquatic of locomotion. The model draws inspiration from the seabird Uria aal...
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This paper presents a numerical model of a morphing wing supporting the development of a biologically inspired vehicle capable of aerial and aquatic of locomotion. The model draws inspiration from the seabird Uria aalge, the common guillemot. It is implemented within a parametric study associated with aerial and aquatic performance, specifically aiming at minimizing energy of locomotion. The implications of varying wing geometry and kinematic parameters are investigated and presented in the form of nested performance charts. Trends within both the aquatic and aerial model are discussed highlighting the implications of parameter variation on the power requirements associated with both mediums. Conflicts of geometric parameter selection are contrasted between the aerial and aquatic model, as well as other trends that impact the design of concept vehicles with this capability. The model has been validated by implementing a heuristic optimization of its key parameters under conditions akin to those of the actual bird; optimal parameters output by the model correlate to the actual behaviour of the guillemot.
Materials programs have followed trends in cost reduction by closing foundries and other expensive facilities. They have also oriented curricula to popular topics such as composites and MEMS. When partnered with other...
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Using density-functional theory within the generalized gradient approximation, we investigate the energetics of oxygen subsurface adsorption governing the onset of bulk oxidation of Cu(100) surface. It shows that the ...
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Using density-functional theory within the generalized gradient approximation, we investigate the energetics of oxygen subsurface adsorption governing the onset of bulk oxidation of Cu(100) surface. It shows that the presence of boundaries formed from merged missing-row nanodomains mismatched by a half unit-cell leads to preferred oxygen adsorption at the subsurface tetrahedral sites. The resulting Cu-O tetrahedrons along the domain boundary strikingly resemble that of the bulk oxide phase of Cu2O. These results provide direct atomic-scale insight into the microscopic origin of the crystallographic orientation relationships for oxide overlayer growth. Our results also suggest that the oxidation of an atomically flat terrace can still be a heterogeneous nucleation process controlled by defects in the oxygen-chemisorbed adlayer.
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