scholarly journals Collaborative Augmented Digital Twin: A Novel Open-Source Augmented Reality Solution for Training and Maintenance Processes in the Shipyard of the Future

2021 ◽  
Vol 7 (1) ◽  
pp. 10
Author(s):  
Aida Vidal-Balea ◽  
Oscar Blanco-Novoa ◽  
Paula Fraga-Lamas ◽  
Miguel Vilar-Montesinos ◽  
Tiago M. Fernández-Caramés
Keyword(s):  
Augmented Reality ◽  
Performance Tests ◽  
Critical System ◽  
Operator Training ◽  
Digital Twin ◽  
Actual Equipment ◽  
Worker Performance ◽  
New Type ◽  
Collaborative Interaction ◽  
The Cost

Large companies use a lot of resources on workshop operator training and industrial machinery maintenance since the lack of this practice or its poor implementation increases the cost and risks of operating and handling sensitive and/or hazardous machinery. Industrial Augmented Reality (IAR), a major technology in the Industry 4.0 paradigm that may enhance worker performance, minimize hazards and improve manufacturing processes, could be beneficial in this situation. This paper presents an IAR solution that allows for visualizing and interacting with the digital twin of a critical system. Specifically, the augmented digital twin of an industrial cooler was developed. The proposed IAR system provides a dynamic way to perform operator training with a full-size model of the actual equipment and to provide step-by-step guidance so that maintenance processes can be performed more safely and efficiently. The proposed system also allows several users to use devices at the same time, creating a new type of collaborative interaction by viewing the model in the same place and state. Performance tests with many simultaneous users have been conducted, with response latency being measured as the number of connected users grows. Furthermore, the suggested IAR system has been thoroughly tested in a real-world industrial environment.

Augmented Reality Procedure Assistance System for Operator Training and Simulation

2020 ◽  
Vol 64 (1) ◽  
pp. 1176-1180
Author(s):  
Eugene Hayden ◽  
Kang Wang ◽  
Chengjie Wu ◽  
Shi Cao
Keyword(s):  
Augmented Reality ◽  
Situation Awareness ◽  
Mental Workload ◽  
Field Of View ◽  
Task Completion ◽  
Operator Training ◽  
Head Mounted Display ◽  
Subject Design ◽  
Procedural Tasks ◽  
Speed Accuracy

This study explores the design, implementation, and evaluation of an Augmented Reality (AR) prototype that assists novice operators in performing procedural tasks in simulator environments. The prototype uses an optical see-through head-mounted display (OST HMD) in conjunction with a simulator display to supplement sequences of interactive visual and attention-guiding cues to the operator’s field of view. We used a 2x2 within-subject design to test two conditions: with/without AR-cues, each condition had a voice assistant and two procedural tasks (preflight and landing). An experiment examined twenty-six novice operators. The results demonstrated that augmented reality had benefits in terms of improved situation awareness and accuracy, however, it yielded longer task completion time by creating a speed-accuracy trade-off effect in favour of accuracy. No significant effect on mental workload is found. The results suggest that augmented reality systems have the potential to be used by a wider audience of operators.

scholarly journals Augmented reality and digital twin system for interaction with construction machinery

2021 ◽  
pp. 1-12
Author(s):  
Syed Mobeen Hasan ◽  
Kyuhyup Lee ◽  
Daeyoon Moon ◽  
Soonwook Kwon ◽  
Song Jinwoo ◽  
...  
Keyword(s):  
Augmented Reality ◽  
Construction Machinery ◽  
Digital Twin ◽  
Twin System

Sorting permutations by fragmentation-weighted operations

2020 ◽  
Vol 18 (02) ◽  
pp. 2050006 ◽  
Author(s):  
Alexsandro Oliveira Alexandrino ◽  
Carla Negri Lintzmayer ◽  
Zanoni Dias
Keyword(s):  
Approximation Algorithms ◽  
Computational Biology ◽  
Cost Function ◽  
Traditional Approach ◽  
Upper Bounds ◽  
Evolutionary Distance ◽  
Lower And Upper Bounds ◽  
Approximation Factor ◽  
New Type ◽  
The Cost

One of the main problems in Computational Biology is to find the evolutionary distance among species. In most approaches, such distance only involves rearrangements, which are mutations that alter large pieces of the species’ genome. When we represent genomes as permutations, the problem of transforming one genome into another is equivalent to the problem of Sorting Permutations by Rearrangement Operations. The traditional approach is to consider that any rearrangement has the same probability to happen, and so, the goal is to find a minimum sequence of operations which sorts the permutation. However, studies have shown that some rearrangements are more likely to happen than others, and so a weighted approach is more realistic. In a weighted approach, the goal is to find a sequence which sorts the permutations, such that the cost of that sequence is minimum. This work introduces a new type of cost function, which is related to the amount of fragmentation caused by a rearrangement. We present some results about the lower and upper bounds for the fragmentation-weighted problems and the relation between the unweighted and the fragmentation-weighted approach. Our main results are 2-approximation algorithms for five versions of this problem involving reversals and transpositions. We also give bounds for the diameters concerning these problems and provide an improved approximation factor for simple permutations considering transpositions.

scholarly journals Впровадження технологій доповненої реальності у навчальному процесі з конструювання авіаційної техніки

2021 ◽  
pp. 110-118
Author(s):  
Олександр Володимирович Каратанов ◽  
Андрій Миколайович Биков ◽  
Марія Вадимівна Сергієнко ◽  
Дмитро Михайлович Мірошниченко
Keyword(s):  
Augmented Reality ◽  
Mixed Reality ◽  
Educational Process ◽  
Modern Education ◽  
Augmented Reality Application ◽  
The World ◽  
Augmented Reality Technology ◽  
Increase Productivity ◽  
Virtual And Augmented Reality ◽  
The Cost

This study examines augmented reality, which imposes on the world around us virtual objects, characters, filters, or other effects through a special camera. Currently, augmented reality is considered potential for pedagogical programs and it is beginning to gain momentum and be actively used. The use of augmented reality technology opens up new opportunities that increase productivity and efficiency in various industries, improve communication and knowledge transfer and make distance learning more comfortable and realistic. However, the factor of reducing the cost of production or the educational process due to the introduction of augmented reality is not yet fully disclosed and requires a detailed analysis, part of which is conducted in this paper. The existing types of augmented, virtual and mixed reality technologies were analyzed, their comparison was made, the current place in the market was determined, as well as their influence and role in modern education. The paper presents examples of the use of augmented reality technology in various fields, including in production, which demonstrates a significant increase in efficiency and confirms the relevance. An overview of the premises and laboratories, which now use virtual and augmented reality technologies for the educational process. The article also describes the shortcomings of the educational process, which can be corrected by introducing augmented reality technology. The economic benefit of using augmented reality in the educational process on a real example was calculated, due to which the expediency of this implementation was proved. Elements of the educational process are considered, the replacement of which with augmented reality will make education cheaper, and this means more accessible. An example of markers used for an augmented reality application in the field of aircraft construction is given. The tendency of the application of augmented reality and use in the educational process for the next years is analyzed, the branches in which it can be applied are considered and the expediency of its use is confirmed.

scholarly journals Investigation of Unsteady Pressure Pulsation in New Type Dishwasher Pump with Special Double Tongue Volute

2022 ◽  
Vol 2022 ◽  
pp. 1-11
Author(s):  
Jinfeng Zhang ◽  
Yilei Zhu ◽  
Yalin Li ◽  
Ping Huang ◽  
Hui Xu ◽  
...  
Keyword(s):  
Pressure Pulsation ◽  
Rotation Speed ◽  
Performance Tests ◽  
Unsteady Pressure ◽  
Passive Rotation ◽  
Impeller Outlet ◽  
Tongue Position ◽  
New Type ◽  
Reference Scheme ◽  
Blade Frequency

Through numerical simulations, this work analyzes the unsteady pressure pulsation characteristics in new type of dishwasher pump with double tongue volute and single tongue volute, under volute static and rotation conditions. Likewise, the performance tests were also carried out to verify the numerical results. Multiple monitoring points were set at the various positions of new type dishwasher pump to collect the pressure pulsation signals, and the relevant frequency signals were obtained via Fast Fourier Transform, to analyze the influence of volute tongue and its passive speed on the pump performance. The results reveal that when the double tongue volute is stationary, the pressure pulsation amplitudes increase from the impeller inlet to the impeller outlet. Under the influence of shedding vortex, the pressure pulsation in the lateral region of tongue becomes disorganized, and the main frequency of pressure pulsation changes from blade frequency to shaft frequency. In addition, compared with the static volute, double tongue volute can effectively guide the water flow out of the tongue during the rotation process, thus ensuring good periodicity for pressure pulsation in the tongue region. Accordingly, a volute reference scheme with passive rotation speed is proposed in this study, which can effectively improve the pressure pulsation at tongue position, and provides a new idea for rotor-stator interference to guide the innovation of dishwasher.

Mixed Realities as the New Reality in Tourism

2021 ◽  
pp. 197-220
Author(s):  
Maria Francisca Casado-Claro ◽  
Marina Mattera
Keyword(s):  
Virtual Reality ◽  
Augmented Reality ◽  
Mixed Reality ◽  
Tourism Industry ◽  
Visitor Experience ◽  
New Normal ◽  
Physical Presence ◽  
Travel Restrictions ◽  
New Type

This chapter proposes a comprehensive approach to understand not only how augmented reality and virtual reality operate within the tourism industry, but also how mixed reality can contribute to enhance the visitor experience and how tourism organizations can move beyond traditional communication and physical experiences into a new type of tourism approach that helps them stay relevant in the long term, as well as in the mid-term. Since the tourism industry is amongst the most affected by the COVID-19 pandemic, changes are essential to ensure an adequate adaptation to the ‘new normal'. Technology enables various tourist organizations to generate greater value creation and opens possibilities to be able to extend the visit beyond physical presence, to ensure the safety of workers and visitors, to improve processes, and to make them more competitive overall. If this is carried out in collaboration with all stakeholders, one destination can generate a solid network to promote itself and become competitive during travel restrictions and in preparation for a post-pandemic new normal.

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