摘要 :
The FELIX 3D Display belongs to the class of volumetric displays using the swept volume technique. It is designed to display images created by standard CAD applications, which can be easily imported and interactively transformed i...
展开
The FELIX 3D Display belongs to the class of volumetric displays using the swept volume technique. It is designed to display images created by standard CAD applications, which can be easily imported and interactively transformed in real-time by the FELIX control software. The images are drawn on a spinning screen by acousto-optic, galvanometric or polygon mirror deflection units with integrated lasers and a color mixer. The modular design of the display enables the user to operate with several equal or different projection units in parallel and to use appropriate screens for the specific purpose. The FELIX 3D Display is a compact, light, extensible and easy to transport system. It mainly consists of inexpensive standard, off-the-shelf components for an easy implementation. This setup makes it a powerful and flexible tool to keep track with the rapid technological progress of today. Potential applications include imaging in the fields of entertainment, air traffic control, medical imaging, computer aided design as well as scientific data visualization. The FELIX 3D project team has evolved from a scientific working group of students and teachers at a normal High School in Germany. Despite minor funding resources within this non-commercial group considerable results have been achieved.
收起
摘要 :
The two basic classes of volumetric displays are swept volume techniques and static volume techniques. During several years of investigations on swept volume displays within the FELIX 3D Project we learned about some significant d...
展开
The two basic classes of volumetric displays are swept volume techniques and static volume techniques. During several years of investigations on swept volume displays within the FELIX 3D Project we learned about some significant disadvantages of rotating screens, one of them being the presence of hidden zones, and therefore started investigations on static volume displays two years ago with a new group of high school students. Systems which are able to create a space-filling imagery without any moving parts are classified as static volume displays. A static setup e.g. a transparent crystal describes the complete volume of the display and is doped with optically active ions of rare earths. These ions are excited in two steps by two intersecting IR-laser beams with different wavelengths (two-frequency, two-step upconversion) and afterwards emit visible photons. Suitable host materials are crystals, various special glasses and in future even polymers. The advantage of this approach is that there are only very little hidden zones which leads to a larger field of view and a larger viewing zone, the main disadvantage is the small size of the currently used fluoride crystals. Recently we started working with yttrium-lithium-fluoride (YLiF_4) crystals, which are still very small but offer bright voxels with less laser-power than necessary in CaF_2 crystals. Potential applications are for example in medical imaging, entertainment and computer aided design.
收起
摘要 :
The two basic classes of volumetric displays are swept volume techniques and static volume techniques. During several years of investigations on swept volume displays within the FELIX 3D Project we learned about some significant d...
展开
The two basic classes of volumetric displays are swept volume techniques and static volume techniques. During several years of investigations on swept volume displays within the FELIX 3D Project we learned about some significant disadvantages of rotating screens, one of them being the presence of hidden zones, and therefore started investigations on static volume displays two years ago with a new group of high school students. Systems which are able to create a space-filling imagery without any moving parts are classified as static volume displays. A static setup e.g. a transparent crystal describes the complete volume of the display and is doped with optically active ions of rare earths. These ions are excited in two steps by two intersecting IR-laser beams with different wavelengths (two-frequency, two-step upconversion) and afterwards emit visible photons. Suitable host materials are crystals, various special glasses and in future even polymers. The advantage of this approach is that there are only very little hidden zones which leads to a larger field of view and a larger viewing zone, the main disadvantage is the small size of the currently used fluoride crystals. Recently we started working with yttrium-lithium-fluoride (YLiF_4) crystals, which are still very small but offer bright voxels with less laser-power than necessary in CaF_2 crystals. Potential applications are for example in medical imaging, entertainment and computer aided design.
收起
摘要 :
Flat 2D screens cannot display complex 3D structures without the usage of different slices of the 3D model. A volumetric display, like the FELIX 3D Display can solve this problem. It provides space-filling images and is characteri...
展开
Flat 2D screens cannot display complex 3D structures without the usage of different slices of the 3D model. A volumetric display, like the FELIX 3D Display can solve this problem. It provides space-filling images and is characterized by "multi-viewer" and "all-round view" capabilities without requiring cumbersome goggles. The FELIX 3D Displays of the swept volume type use laser-light to project real three-dimensional images upwards a rotating screen. Because of some disadvantages using rotating parts in this setup, the FELIX Team started investigations also in the area of static volume displays. The so called, "SolidFELIX" prototypes, have transparent crystals as a projection volume. The image is created by two or one IR-laser beams. The projected images within all FELIX 3D Displays provide a fascinating, aesthetic impression through their inherent, unique three-dimensional appearance. These features of a 3D display could be combined in an interface between a virtual reality scene and the real world. Real-time interactions and animations are possible. Furthermore, the display could host an intelligent autonomous avatar that might appear within the display volume. Potential applications as a virtual reality interface include the fields of entertainment, education, art, museum exhibitions, etc. The FELIX 3D project team has evolved from a scientific working group of students and teachers at a normal high school in northern Germany. Despite minor funding resources considerable results have been achieved in the past.
收起
摘要 :
Flat 2D screens cannot display complex 3D structures without the usage of different slices of the 3D model. A volumetric display, like the FELIX 3D Display can solve this problem. It provides space-filling images and is characteri...
展开
Flat 2D screens cannot display complex 3D structures without the usage of different slices of the 3D model. A volumetric display, like the FELIX 3D Display can solve this problem. It provides space-filling images and is characterized by “multi-viewer” and “all-round view” capabilities without requiring cumbersome goggles. The FELIX 3D Displays of the swept volume type use laser-light to project real three-dimensional images upwards a rotating screen. Because of some disadvantages using rotating parts in this setup, the FELIX Team started investigations also in the area of static volume displays. The so called, “SolidFELIX” prototypes, have transparent crystals as a projection volume. The image is created by two or one IR-laser beams. The projected images within all FELIX 3D Displays provide a fascinating, aesthetic impression through their inherent, unique three-dimensional appearance. These features of a 3D display could be combined in an interface between a virtual reality scene and the real world. Real-time interactions and animations are possible. Furthermore, the display could host an intelligent autonomous avatar that might appear within the display volume.Potential applications as a virtual reality interface include the fields of entertainment, education, art, museum exhibitions, etc. The FELIX 3D project team has evolved from a scientific working group of students and teachers at a normal high school in northern Germany. Despite minor funding resources considerable results have been achieved in the past.
收起
摘要 :
The subject of this seakeeping study is a self-installing offshore platform – the Mobile Offshore Application Barge (MOAB~?). The MOAB~? is a floating pontoon which is coupled with a foundation structure. The lower part of the fo...
展开
The subject of this seakeeping study is a self-installing offshore platform – the Mobile Offshore Application Barge (MOAB~?). The MOAB~? is a floating pontoon which is coupled with a foundation structure. The lower part of the foundation structure is arranged with suction cans. The suction cans are open at the bottom and their dimensions are large compared to the pontoon. The aim of the seakeeping study is to investigate the limits of the applicability of different numerical methods by simulating the motion behaviour of the MOAB~? platform in seaway. Two different potential flow solvers and an Euler solver are considered. In addition to the numerical investigations, experimental studies were conducted to a 1:40 scaled model. Results of the model tests in regular waves for heave, roll and pitch motion are presented as response amplitude operators (RAOs). The simulations were performed using the potential flow solvers ANSYS Aqwa and MOSES in the frequency domain, and the finite volume method (FVM) STAR-CCM+ in the time domain. In all simulations the platform was excited via regular waves.
收起
摘要 :
The subject of this seakeeping study is a self-installing offshore
platform – the Mobile Offshore Application Barge (MOAB~?). The
MOAB~? is a floating pontoon which is coupled with a foundation
structure. The lower part of the...
展开
The subject of this seakeeping study is a self-installing offshore
platform – the Mobile Offshore Application Barge (MOAB~?). The
MOAB~? is a floating pontoon which is coupled with a foundation
structure. The lower part of the foundation structure is arranged with
suction cans. The suction cans are open at the bottom and their
dimensions are large compared to the pontoon.
The aim of the seakeeping study is to investigate the limits of the
applicability of different numerical methods by simulating the motion
behaviour of the MOAB~? platform in seaway. Two different potential
flow solvers and an Euler solver are considered.
In addition to the numerical investigations, experimental studies were
conducted to a 1:40 scaled model. Results of the model tests in regular
waves for heave, roll and pitch motion are presented as response
amplitude operators (RAOs). The simulations were performed using the
potential flow solvers ANSYS Aqwa and MOSES in the frequency
domain, and the finite volume method (FVM) STAR-CCM+ in the time
domain. In all simulations the platform was excited via regular waves.
收起
原文获取