Shell's Enchilada offshore platform has been surveyed in September 2012 with a specially built, fully automated 100 megapixel 360º HDR panoramic photography camera system with 3D measurement capability. Subsequently, a 360º PanoramicGuide web-based viewer was produced and made available to Shell users. The spherical photos were indexed to the facility's general arrangement drawings. Interactive descriptive menus and maps were made available to quickly locate and navigate to points of interest. Users can choose from multiple viewpoints of the Enchilada facility, view 360º in all directions around those viewpoints to virtually examine various areas/equipment in the platform, zoom in to view precise detail, and take 3D measurements between visually recognizable shapes and patterns from the viewpoints. The paper will discuss a number of potential and tested applications, the latter where the technology has been used for the Enchilada platform: a) Detailed visual assessments for engineering design, project planning, operations and safety reviews; b) Visual reference during conference collaboration meetings with offsite subject matter experts and email communications to assure common understanding; c) Visual assessments by subject matter experts, including consultants and sub-contractors that are not possible with video, standard photography or 3D models/images created from laser scans alone. Experience using the viewer has demonstrated that users are able to improve quality and collaboration in planning work related to construction and modifications, potentially resulting in decreased cost and project recycle, improved HSE and reduced liability and risk, by minimizing or even eliminating offshore trips and time on site for vendors and other personnel. Development of new advanced visualization and communication technologies will be a key success factor for future improvements in planning, asset management and Integrated Operations, among other remote operations activities.
The effects of slowly-varying wave drift forces on the nonlinear dynamics of mooring systems have been studied extensively in the past 30 years. It has been concluded that slowly-varying wave drift may resonate with mooring system natural frequencies. In recent work, we have shown that this resonance phenomenon is only one of several possible nonlinear dynamic interactions between slowly-varying wave drifts and mooring systems. We were able to reveal new phenomena, based on the design methodology developed at the University of Michigan for autonomous mooring systems, and treating slowly-varying wave drift as an external time-varying force in systematic simulations. This methodology involves exhaustive search regarding the nonautonomous excitation, however, and approximations in defining response bifurcations. In this paper, a new approach is developed, based on the harmonic balance method, where the response to the slowly-varying wave drift spectrum is modeled by limit cycles of frequency, estimated from a limited number of simulations. Thus, it becomes possible to rewrite the nonautonomous system as autonomous and reveal stability properties of the nonautonomous response. Catastrophe sets of the symmetric principal equilibrium, serving as design charts, define regions in the design space where the trajectories of the mooring system are asymptotically stable, limit cycles, or nonperiodic. This methodology reveals and proves that mooring systems subjected to slowly-varying wave drift exhibit many nonlinear phenomena, which lead to motions with amplitudes two to three orders of magnitude larger than those resulting from linear resonance. A turret mooring system (TMS) is used to demonstrate the harmonic balance methodology developed. The produced catastrophe sets are then compared with numerical results obtained from systematic simulations of the TMS dynamics.
Shell's Enchilada offshore platform has been surveyed in September 2012 with a specially built, fully automated 100 megapixel 360º HDR panoramic photography camera system with 3D measurement capability. Subsequently, a 360º PanoramicGuide web-based viewer was produced and made available to Shell users. The spherical photos were indexed to the facility's general arrangement drawings. Interactive descriptive menus and maps were made available to quickly locate and navigate to points of interest. Users can choose from multiple viewpoints of the Enchilada facility, view 360º in all directions around those viewpoints to virtually examine various areas/equipment in the platform, zoom in to view precise detail, and take 3D measurements between visually recognizable shapes and patterns from the viewpoints.The paper will discuss a number of potential and tested applications, the latter where the technology has been used for the Enchilada platform: a) Detailed visual assessments for engineering design, project planning, operations and safety reviews; b) Visual reference during conference collaboration meetings with offsite subject matter experts and email communications to assure common understanding; c) Visual assessments by subject matter experts, including consultants and sub-contractors that are not possible with video, standard photography or 3D models/images created from laser scans alone. Experience using the viewer has demonstrated that users are able to improve quality and collaboration in planning work related to construction and modifications, potentially resulting in decreased cost and project recycle, improved HSE and reduced liability and risk, by minimizing or even eliminating offshore trips and time on site for vendors and other personnel.Development of new advanced visualization and communication technologies will be a key success factor for future improvements in planning, asset management and Integrated Operations, among other remote operations activities.
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