The development of the Digital Micromirror Device (DMD) by Texas Instruments has made a significant breakthrough
in 3D micro-manufacturing, and in particular, in the area of additive layer-based manufacturing. One area of particular
interest for using DMD technology is microstereolithography; a technology that builds 3D shapes through successive
photopolymerization of individual thin 2D layers that are stacked vertically. A DMD-based projection
microstereolithography system and a robust micro-manufacturing process have been developed. This system and
various micro-fabricated 3D structures with features on the order of 10 microns, including recent advancements in multimaterial
micro-fabrication, will be presented and described.
This paper is concerned with the applicability of the developed MR damper to the landing gear system for the attenuating
undesired shock and vibration in the landing and taxing phases. First of all, the experimental model of the MR damper is
derived based on the results of performance evaluations. Next, a simplified skyhook controller, which is one of the most
straightforward, but effective approaches for improving ride comport in vehicles with active suspensions, is formulated.
Finally, the vibration control performances of the landing gear system using the MR damper are theoretically evaluated
in the landing phase of the aircraft. A series of simulation analyses show that the proposed MR damper with the skyhook
controller is effective for suppressing undesired vibration of the aircraft body.
Proc. SPIE. 6050, Optomechatronic Micro/Nano Devices and Components
KEYWORDS: Mirrors, 3D imaging standards, Data modeling, Ultraviolet radiation, Micromirrors, Polymerization, Digital micromirror devices, Rapid manufacturing, Standards development, 3D microstructuring
Using microstereolithography technology based on dynamic pattern projection, we can fabricate micro parts with high aspect ratio. In this technology, STL file is the standard format as the same of conventional rapid prototyping system, and 3D part is fabricated by stacking layers that are sliced as 2D section from STL file.
In the conventional method, the resin surface is cured as scanning laser beam spot according to the section shape, but in this research, we use projection process which enables to cure the resin surface by one irradiation. DMD is a dynamic pattern generator that makes black and white regions according to bitmap image generated from sliced section.
In this paper, we deal with the operation of dynamic pattern generator, fabrication of microstructures, and curing characteristics. Firstly, we mention microstereolithography apparatus and process including optically designed position and rotation of lenses, mirrors, and DMD according to light path. Secondly, we examine curing characteristics between exposure time and curing depth and width. Thirdly, we consider optimal exposure pattern such as several exposures instead of one exposure with the same exposure time. This enables the part fabricated more accurately because of not excessive but proper energy delivery to the resin surface. Finally we verify this system by fabricating micro part with high aspect ratio and complexity.