The Mechanics Analysis Of Perforated Structure And The Optimization And Design Of The Structure Of The New Focal Panel

LAMOST is a very advanced one large international telescope, compared to other large telescopes internationally with a light and strong, large field of view, a small aberration characteristics.Focal plane instrument panel system image quality coke stress-strain conditions telescope system will have a decisive impact. Axis angle of25degrees with the horizontal working position LAMOST focal plane, the panel will focus around the time of observation in the axis of rotation, so the focal plane of the entire work process is extremely small changes in stress and strain. The large telescope abroad as Bigboss telescope focal plane than in the plane of rotation, but the plane flipped while achieving a flip of space, gravity loads at this time will have a significant impact on the accuracy of the opposite type and therefore pose this space changes to the focal plane of the surface type of a higher precision requirements; Meanwhile, with the development of optical technology, the focus panel mount optical fiber positioning unit also continued miniaturization, precision. For more than two points, on the basis of the use of novel small unit proposes a new focal plane structure, both to ensure a good focal plane surface type can improve the accuracy and efficiency of spectrum acquisition. Solve the surface shape and stiffness change issues and coke unit miniaturization brought flip panel space. Pass through a number of holes with different focal plane of ANS YS modeling and simulation, demonstration of the new structure can be a good model to ensure the accuracy of the focal plane of the surface and can improve collection efficiency of the spectrum.Based on the theory of plates and shells, shell classical mechanics of elastic, resilient sheet and a porous coke panel stress analysis calculations to study the thickness gradually increased and when the thin plates with holes by using the theory of plate and structural characteristics. While the study on the basis of LAMOST focal panel proposed the concept of using hexagonal integrated module of the new focus of the panel, and studied under different pore sizes, different modules gap arrangement different ways, under different conditions and different support conditions thickness, the maximum displacement of the center of the focal plane, the stress-strain conditions and the use of dual rotary positioning mechanism under the premise of different modules corresponding to the blind spot the size of the gap, effective solution to the unit optimization and face shape and stiffness of the panel space flip coke changes brought problems. I do combine research literature review on the subject and in-depth study of aspects of the work on their own issues to do, this article has the following four points innovation:1. Using mechanical analysis method to analyze the classical theory of elasticity describes the theory and Reisner plate on the elastic plates and shells, plates and shells made of deflection equation; analysis of the thin openings, the use of two theories in stress and strain on the error calculation.Ansys software with formulas and concepts proposed by the modeling analysis verified.2. Comprehensive comparison of past research scientist at the equivalent elastic coefficients, the concept of equivalent solid plate to calculate the corresponding deflection of the porous plate to LAMOST focal plane as an example to verify the proper analysis of the equivalent elastic modulus and by choosing Poisson’s ratio can be equivalent to the deflection of the porous plate mechanical analysis calculations.3. In the working position of the telescope axis LAMOST angle of25degrees with the horizontal, the focal plane when observing the rotation about the axis does not occur in the space between the flip, and because the focal plane LAMOST larger, block more light effects through the telescope and aperture efficiency, there is an urgent need for miniaturization of the optical fiber positioning unit, which can reduce the diameter of the focal plane so as to reduce the light-blocking. For more than two points in this article, based on the use of small unit presents a new focal plane structure, reducing the size of the blind spot in the focal plane of the base surface to ensure a good model to improve the accuracy of the collection efficiency of the spectrum.4. Specifically designed to analyze and study the hexagonal model with different pore sizes, different modules gap arrangement different ways, under different conditions and different support conditions thickness, the maximum displacement of the center of the focal plane, the stress and strain conditions. The calculation of the gap is not the same module corresponding to the blind spot size, and made of hexagonal modules dislocation distribution, the distribution of the concept being proposed to add a little support centers, three supporting ideas and verified...