A PC Cluster High-Fidelity Mobile Crane Simulator

[[abstract]]The mobile crane simulator is a project sponsored by Employment and Vocational Training Administration, Council of Labor Affair, Executive Yuan, Taiwan, to build a safe device for training and licensing. This paper presents the principle and mechanism to build a high-fidelity interactive visual simulator on a cluster of PCs. The implemented mobile crane simulator uses the peer-to-peer architecture with the push and pull mechanism to achieve the parallelism among distributed tasks. A distributive simulation socket, called Communication Backbone(CB), is adopted to integrate the functional tasks of the mobile crane simulator in a PC clustering environment. With CB, tasks of the simulated mobile crane are executed as standalone applications and seamlessly communicate with each other through CB. Finally, the system response rate of the implemented mobile crane simulator achieves 16 times per second which is larger than human acceptable perception rate as suggested by the human factors studies.[[abstract]]The mobile crane simulator is a project sponsored by Employment and Vocational Training Administration, Council of Labor Affair, Executive Yuan, Taiwan, to build a safe device for training and licensing. This paper presents the principle and mechanism to build a high-fidelity interactive visual simulator on a cluster of PCs. The implemented mobile crane simulator uses the peer-to-peer architecture with the push and pull mechanism to achieve the parallelism among distributed tasks. A distributive simulation socket, called Communication Backbone(CB), is adopted to integrate the functional tasks of the mobile crane simulator in a PC clustering environment. With CB, tasks of the simulated mobile crane are executed as standalone applications and seamlessly communicate with each other through CB. Finally, the system response rate of the implemented mobile crane simulator achieves 16 times per second which is larger than human acceptable perception rate as suggested by the human factors studies

Enabling the Development and Implementation of Digital Twins : Proceedings of the 20th International Conference on Construction Applications of Virtual Reality

Welcome to the 20th International Conference on Construction Applications of Virtual Reality (CONVR 2020). This year we are meeting on-line due to the current Coronavirus pandemic. The overarching theme for CONVR2020 is "Enabling the development and implementation of Digital Twins". CONVR is one of the world-leading conferences in the areas of virtual reality, augmented reality and building information modelling. Each year, more than 100 participants from all around the globe meet to discuss and exchange the latest developments and applications of virtual technologies in the architectural, engineering, construction and operation industry (AECO). The conference is also known for having a unique blend of participants from both academia and industry. This year, with all the difficulties of replicating a real face to face meetings, we are carefully planning the conference to ensure that all participants have a perfect experience. We have a group of leading keynote speakers from industry and academia who are covering up to date hot topics and are enthusiastic and keen to share their knowledge with you. CONVR participants are very loyal to the conference and have attended most of the editions over the last eighteen editions. This year we are welcoming numerous first timers and we aim to help them make the most of the conference by introducing them to other participants

Development of offshore wind power price competitiveness using a new logistics construct

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INCORPORATING RADIO FREQUENCY MESH NETWORKS TO LINK LIVE, VIRTUAL, CONSTRUCTIVE TRAINING

Given the importance of modeling and simulation (M&S) for creating realistic training environments and employing or developing tactical systems for warfighters, the Department of Defense is turning toward live, virtual, constructive (LVC) simulations as a means to prepare and equip our military for the next war. M&S offers a unique competency for modeling emergent enemy behaviors in constructive simulations on virtual battlefields across the globe. Transferring these dynamic tactical actions to live command and control (C2) systems used during training can create decision-making opportunities for distributed units to react to and act upon. The research conducted in this thesis assessed, developed, and implemented an appropriate LVC environment that can be used in training for tactical convoy operations in the Marine Corps. We developed a robust mesh network connected to a personal computer running a constructive simulation to create dynamic tracks on handheld, Android-based C2 systems. Using low-bandwidth radios to create the network, we were able to create a rich, tactically realistic training environment while minimally increasing the combat load of our Marines. The system we created has the same functionality of the blue force tracker (BFT). Because the BFT is no longer funded, we recommend the LVC solution we created for this thesis as a potential replacement with embedded training capabilities.Captain, United States Marine CorpsApproved for public release. distribution is unlimite

A literature survey of clear air turbulence

Literature survey on clear air turbulenc

CFD simulation study of the flow field in a tornado-like vortex

Because of the lack of field measurements near the ground in tornadoes, numerical simulation may provide the best estimate of the near-ground wind profiles, assuming such simulations are realistic and agree well with the available observations at higher levels. An accurate understanding of the loads requires knowledge about near-ground tornado winds. The numerical simulations based on the ISU laboratory tornado model agree well with the Spencer, South Dakota tornado of 30 May 1998. The wind measurements taken by portable Doppler radars are restricted to levels higher than at least 20-50 m above the ground. It is necessary to understand tornado-induced wind loads on typical structures to help improve structural designs to resist tornado winds. Computational Fluid dynamic (CFD) simulations are used as a tool to validate a laboratory model\u27s ability to simulate a real tornado vortex by studying the near ground flow field. The sensitivity of solutions to parameters such as the inflow depth, inflow radius, outflow radius, mesh size, boundary condition, surface roughness and Swirl ratio was explored by designing a numerical model based on the ISU laboratory tornado simulator. The study suggests that it is important to correctly choose the inflow radius to be far enough away from the tornado to minimize the influence of the boundary conditions on the vortex, but close enough to the tornado to reduce the influence of difficult-to-simulate surface roughness. The simulated core radius is greatly affected by both outflow radius and Swirl ratio. The fine mesh size provides a higher resolution than Doppler radar data, and stronger tangential velocities are thus simulated at the core radius. The effects of surface roughness are to reduce the tangential velocity and slightly enlarge the core radius. Three ways of increasing roughness in the numerical simulation are tested. It was found that the most efficient way to represent roughness was to increase the roughness elements\u27 height. These conclusions could assist in the design of future numerical or laboratory experiments exploring the near ground flow more closely