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Perceived Hardness of Virtual Surface: A Function of Stiffness, Damping, and Contact Transient

Perceived Hardness of Virtual Surface: A Function of Stiffne...

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IEEE World Haptics conference (WHC)

作者： Choi, Hyejin Bhardwaj, Amit Yoon, Gyeore Choi, Seungmoon Pohang Univ Sci & Technol POSTECH Dept Comp Sci & Engn Pohang South Korea Indian Inst Technol Dept Elect Engn Jodhpur Rajasthan India

ISBN: (纸本)9781665418713

Haptic rendering of virtual objects requires a model for the object's hardness. The classical spring-damper model is effective in resisting the user's penetration into the virtual surface, while a short vibratory transient signal superimposed at contact increases the user-perceived hardness. In this paper, we are concerned with the combined case: the perceived hardness of a virtual surface rendered by the spring-damper model with a contact transient, in the tool-mediated perception. We report three perceptual experiments conducted to clarify the effects of five rendering parameters-stiffness and damping (spring-damper model);and amplitude, frequency, and decay rate (contact transient). All the parameters except decay rate are shown to have statistically significant effects on the perceived hardness. We also present a psychophysical magnitude function of perceived hardness for the four significant parameters of stiffness, damping, amplitude, and frequency. This mathematical model helps virtual environment designs build the virtual surfaces of desired perceived hardness.

关键词： Damping Vibrations Computational modeling Force feedback Virtual environments Rendering (computer graphics) Surface fitting

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Enhanced Canvasback Swarm Algorithm for Active Power Loss Diminution and Voltage Stability Enhancement

Enhanced Canvasback Swarm Algorithm for Active Power Loss Di...

引用

International conference on Power Electronic Drives

作者： Lenin Kanagasabai Prasad V. Potluri Siddhartha Institute of Technology Vijayawada Andhra pradesh India

ISBN: (数字)9798350372472

ISBN: (纸本)9798350372489

Enhanced Canvasback swarm (ECS) algorithm is based on the examining activities of the Canvasback and in order to expand the exploration capability, canvasback swarm algorithm has been integrated with gemsbok optimization algorithm. In the exploration section canvasback queuing around the food spring region and canvasback disperses in that specific region for searching the food. Canvasback completes the search after food springs are identified and canvasback will be positioned rendering to the accessibility condition of the food springs and fitness value computed in that location. Location changing during foraging and excavating behaviour of gemsbok has been considered in the design of the gemsbok optimization algorithm. Gemsbok has a high capability of tracking rain and identifies regions of vegetation in the foraging conditions. Gemsbok owns high skill in excavating to take rest in a particular place. Design of the algorithm exploration grounded on foraging procedure of the gemsbok and exploitation is modeled based on excavating ability of the Gemsbok. Enhanced Canvasback swarm (ECS) algorithm validated in IEEE 30, 57 systems.

关键词： Rain Clustering algorithms Vegetation Voltage Excavation Rendering (computer graphics) Stability analysis springs Optimization Thermal stability

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Passivity of Series Damped Elastic Actuation under Velocity-Sourced Impedance Control

Passivity of Series Damped Elastic Actuation under Velocity-...

引用

IEEE World Haptics conference (WHC)

作者： Mengilli, Ugur Orhan, Zeynep Ozge Caliskan, Umut Patoglu, Volkan Sabanci Univ Fac Engn & Nat Sci Istanbul Turkey

ISBN: (纸本)9781665418713

Series elastic actuation (SEA) is a widely-used interaction control approach that relies on an intentionally introduced compliant element between the actuator and the end-effector and the utilization of the model of this compliant element in closed-loop force control to achieve high interaction performance. Velocity-sourced impedance control (VSIC) is the most commonly employed controller for SEA due to its rendering performance, robustness, and ease of tuning. The necessary and sufficient conditions for the frequency-domain passivity of SEA under VSIC have been extensively studied in the literature, establishing the range of passively renderable impedances. In this study, we advocate the addition of physical damping in parallel to the series elastic element in SEA and provide sufficient conditions for the passivity of series damped elastic actuation (SDEA) under VSIC while rendering null space, linear spring, and Voigt model virtual environments. We rigorously prove that SDEA can extend the range of impedances that can be passively rendered with SEA and improve the control performance of the system thanks to the physical damping in parallel to the compliant element. Furthermore, we show the necessity of a physical dissipative element parallel to the series elastic component to render Voigt models and the necessity of the integral gain of the motion controller to render virtual environments modeled by a linear spring.

关键词： Damping Sufficient conditions Virtual environments Null space Rendering (computer graphics) Robustness Haptic interfaces

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Problem-Based Learning by Building an Incremental Web Application

Problem-Based Learning by Building an Incremental Web Applic...

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IEEE Education Engineering (EDUCON)

作者： J. Navarro-Lázaro G. Ortega E.M. Garzón F. Orts A.M. Puertas Dept. of Computer Science University of Almeria Almería Spain Dept. of Chemistry and Physics University of Almeria Almería Spain

ISBN: (数字)9798331539498

ISBN: (纸本)9798331539504

This work aims to present an innovative methodology to be followed in the subject “Advanced Computing”, part of the Master's program in computer Science at the University of Almeria. The methodology seeks to enhance students' engagement with their learning process through modern and effective approaches. Simultaneously, it aims to expand their practical experience through the use of cutting-edge tools for rapid application development, such as spring Boot and Angular, and High Performance Computing techniques applied using CUDA. The primary methodological approach adopted in this course is based on the flipped classroom methodology. This approach will be implemented in conjunction with a real scientific case involving a physical application of microrheology, providing students with a practical and engaging learning experience. Subsequently, the course delves into tools for developing a web application that serves as a visual interface for the generated data, employing rapid application development techniques. Throughout the course, brief theory blocks will be provided as video lectures uploaded by the professor to explain computational tools and the scientific case. However, classes will primarily focus on practical development, where students are provided with a base project from the outset, allowing them sufficient time to complete it independently. As part of the flipped classroom model, the professor will offer support if needed. Additionally, students will be assigned tasks to implement distinct and straightforward features, fostering both their confidence and creativity as independent computer engineers. The course also incorporates AI-driven programming assistance to promote modern productivity methodologies, avoiding common pitfalls that may limit students' programming skills.

关键词： Productivity Visualization Electronic learning High performance computing graphics processing units Online services springs Engineering education Programming profession Creativity

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Mass-spring Model for Liquid Object Collision Simulation 2021

Mass-spring Model for Liquid Object Collision Simulation

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3rd International conference on Image, Video and Signal Processing, IVSP 2021

作者： Yang, Ziyan Zhu, Wenzhe Zhu, Qing Beijing University of Technology Beijing China

ISBN: (纸本)9781450388917

Liquid simulation is an important research direction of computer graphics, and the interaction of dynamic liquid surfaces is one of the challenges. However, traditional liquid simulation requires many calculations, especially when performing complex interactive calculations tasks such as liquid collision simulation. A large amount of calculation will lead to poor interaction of the simulation system, cause the liquid surface animation to freeze and become distorted. Mass-spring systems can be used for modeling deformable objects such as cloth, hair. But few of them are used to simulate the liquid, especially for liquid and object collision. In this research, we propose a method for simulating liquid in a container based on the mass-spring system. Especially to simulate the effects of liquid collision and objects floating or sinking on the water surface. We model the liquid surface as a connected triangular mesh based on the mass-spring system, which can improve calculation efficiency. Simulate the interaction between the liquid surface and the falling object based on physics principles and particle characteristics. Calculate the momentum transfer caused by the interaction between the force of the liquid particles and the surface to determine each particle's position in each time step. For the sinking state of an object caused by buoyancy after entering the liquid, the proton's height is used as the criterion for judging whether the object is sinking. Experiments have shown that our method has excellent efficiency and authenticity, can perform different types of liquids in the container and their interaction with objects. Our method has good application value. © 2021 ACM.

关键词： Liquids

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The Effect of Graph Layout on the Perception of Graph Density: An Empirical Study

The Effect of Graph Layout on the Perception of Graph Densit...

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24th Eurographics conference on Visualization, EuroVis 2022

作者： Kypridemou, E. Zito, M. Bertamini, M. Department of Computer Science University of Liverpool United Kingdom Visual Perception Lab Department of Psychological Sciences University of Liverpool United Kingdom

ISBN: (纸本)9783038681847

The visual representation of a graph is crucial in understanding and analyzing its properties. In this empirical study, we examine the effect of different drawing layouts on our perception of graph density. We treat density as an absolute property of the graph and use a Yes-No design, where participants have to decide whether a graph has a given density or not. We compare a simple grid layout with well-known planar and spring layouts. We also introduce an alternative 'improved' grid layout, which reduces the number of crossings while keeping most of the simplicity of the original grid layout. Results show that our 'improved' version of the grid layout facilitated performance on the task, compared to the original one. Moreover, participants were biased into judging graphs as denser when drawn with the original grid layout, while tended to perceive graphs as less dense when drawn with the planar and grid layouts. In contrast to previous studies on graph density perception, this is the first indication that the chosen layout can influence our perception of the graph's density. © 2022 The Author(s) © 2022 The Eurographics Association.

关键词： Drawing (graphics)

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An Improved Soft Tissue Deformation Simulation Model Based on Mass spring

An Improved Soft Tissue Deformation Simulation Model Based o...

引用

2020 International conference on Virtual Reality and Visualization, ICVRV 2020

作者： Tan, Dongliang Zhao, Jiashi Shi, Weili Li, Xingzhi Yang, Huamin Jiang, Zhengang School of Computer Science and Technology Changchun University of Science and Technology Changchun China The First Hospital of Jilin University The Pain Department Changchun China China School of Computer Science and Technology Changchun University of Science and Technology Changchun China

ISBN: (纸本)9780738142524

A key difficulty in the research of virtual surgery system is soft tissue deformation simulation. The mass-spring model has become one of the most important modeling methods for human soft tissue owing to its simplicity and high efficiency. In this paper, an improved model is proposed for remedying the genic defects of the classical mass-spring model. Soft tissue is divided into different levels of a surface model by introducing the concept of the virtual stress layer. Different springs with virtual stress functions are set to connect these discrete layers so that they can behave as a whole. Since the change of the connection of masses and the transfer of force between adjacent model layers, the improved model is endowed with a more flexible organization and diversified physical attributes. To verify the universality, the improved model is applied to different organs. Meanwhile, parallel computing technology is introduced to reduce the time cost of deformation. The experimental results demonstrate that the improved model achieves certain improvements in real-Time performance and simulation realism compared with the classical mass-spring model. © 2020 IEEE.

关键词： Deformation

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A Controllable spring Force Based Method for Fluid Surface Disturbance Details Simulation 8

A Controllable Spring Force Based Method for Fluid Surface D...

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8th International conference on Digital Home, ICDH 2020

作者： Gao, Languang Jiang, Weina Gao, Chengying Sun Yat-sen University School of Data and Computer Science Guangzhou China

ISBN: (纸本)9781728192345

Particle based simulations are widely used in computer graphics. However, few methods use active control for fluid surface. Thus we present a new controllable method based on the spring force model, which provides active control for the disturbance of the fluid surface. This method modifies the spatial distribution of the particles to generate disturbance. To make it controllable, we design a disturbance equation, using the relationship between the macrostate of fluid and the microscopic particles in the Boltzmann's Entropic Equation. Moreover, we also propose multiple optimizations in order to improve appearance of fluid surface. The correction of fluid splash first detects the target particles by a hybrid method, then adjusts the spring force that acts on these particles. The spring force attenuation model uses a sigmoid function to represent the attenuation of particles at different depths. Experimental results show that our method generates the expected disturbance details. The optimizations enhance the realism of the disturbance simulation. © 2020 IEEE.

关键词： Boltzmann equation

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Designing a Visual Analytics System for Medication Error Screening and Detection 14th

Designing a Visual Analytics System for Medication Error Scr...

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14th International Joint conference on computer Vision, Imaging and computer graphics Theory and Applications (VISAPP)

作者： Kakar, Tabassum Qin, Xiao Tapply, Cory M. spring, Oliver Murphy, Derek Yun, Daniel Rundensteiner, Elke A. Harrison, Lane La, Thang Sahoo, Sanjay K. De, Suranjan Worcester Polytech Inst Worcester MA 01609 USA US FDA Silver Spring MD 20993 USA

ISBN: (纸本)9783030415907;9783030415891

Drug safety analysts at the U.S. Food & Drug Administration analyze medication error reports submitted to the Adverse Event Reporting System (FAERS) to detect and prevent detrimental errors from happening in the future. Currently this review process is time-consuming, involving manual extraction and sense-making of the key information from each report narrative. There is a need for a visual analytics approach that leverages both computational techniques and interactive visualizations to empower analysts to quickly gain insights from reports. To assist analysts responsible for identifying medication errors in these reports, we design an interactive Medication Error Visual analytics (MEV) system. In this paper, we describe the detailed study of the Pharmacovigilance at the FDA and the iterative design process that lead to the final design of MEV technology. MEV a multi-layer treemap based visualization system, guides analysts towards the most critical medication errors by displaying interactive reports distributions over multiple data attributes such as stages, causes and types of errors. A user study with ten drug safety analysts at the FDA confirms that screening and review tasks performed with MEV are perceived as being more efficient as well as easier than when using their existing tools. Expert subjective interviews highlight opportunities for improving MEV and the utilization of visual analytics techniques in general for analyzing critical FAERS reports at scale.

关键词： Treemaps Visual analytics Pharmacovigilance Medication errors

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Modal spring Reverb Based on Discretisation of the Thin Helical spring Model

Modal Spring Reverb Based on Discretisation of the Thin Heli...

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Digital Audio Effects (DAFx), International conference on

作者： Jacob McQuillan Maarten van Walstijn Sonic Arts Research Centre School of Arts English and Languages Queen's University Belfast UK Sonic Arts Research Centre School of Electronics Electrical Engineering and Computer Science Queen's University Belfast UK

ISBN: (纸本)9781665439527

The distributed nature of coupling in helical springs presents specific challenges in obtaining efficient computational structures for accurate spring reverb simulation. For direct simulation approaches, such as finite-difference methods, this is typically manifested in significant numerical dispersion within the hearing range. Building on a recent study of a simpler spring model, this paper presents an alternative discretisation approach that employs higher-order spatial approximations and applies centred stencils at the boundaries to address the underlying linear-system eigenvalue problem. Temporal discretisation is then applied to the resultant uncoupled mode system, rendering an efficient and flexible modal reverb structure. Through dispersion analysis it is shown that numerical dispersion errors can be kept extremely small across the hearing range for a relatively low number of system nodes. Analysis of an impulse response simulated using model parameters calculated from a measured spring geometry confirms that the model captures an enhanced set of spring characteristics.

关键词： Couplings Analytical models Computational modeling Auditory system Rendering (computer graphics) Loss measurement Eigenvalues and eigenfunctions

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