The Format Criterion Of Master’s Degree Paper Of DMU

Five-hundred-meter aperture spherical radio telescope is the largest single-aperture telescope in the world, the breakthroughs and innovations in engineering technology will maintain the first-class status in the next 20-30 years. The main function of FAST feedback supporting system is to bear and drive the feedback cabin to have the movement in the space of one hundred meters scale, and real-time precise positioning.FAST feedback cabin structure consists of four parts:under-platform of Stewart, up-platform of Stewart, AB-axis structure, star-shaped frame. Under-platform connected with up-platform by six driver legs constituting a six-axis robot, and precisely controlling the feedback receivers. This article checks the original structure design of feedback cabin, using commercial finite element software ANSYS to have finite element analysis, and parametric design language to build models of above mentioned four parts, respectively, records and tracks deformation of the corresponding node of connected places, and provides structure deformation in the axis direction of the cloud images as well as the displacement vector images.Assembled the four parts and established the overall structure model of FAST feedback cabin; obtained the solution of finite elements in post-processing modules; Operated optimization module and considering the non-continuous selection of the cross-section to optimize the structure, Under-platform had a re-designed concept to meet the STEWART six legs of six-axis robot reasonable symmetrically distributed in the structure, the same time carrying the nine sets of receivers by uniform force distribution, and ensure symmetry good. Up-platform, AB-axis structure and star-shaped frame had section optimization, re-selected the section size, removed some redundant parts to ensure the structural stiffness and structural symmetry, and reduce the weight of overall structure.After structural optimization, under-platform, up-platform and the AB axis structure was assembled to constitute DOWN structure, rotated DOWN structure to realize the relative rotation between DOWN structural and star-shaped frame. Then, DOWN Structure and star-shaped frame was assembled to constitute the overall model, rotated the overall model to simulate the service state of the overall structure. Deformations of the corresponding node of connected places were recorded, cloud images in the axis direction as well as the displacement vector images were provided in the typical service environment. Modal analysis(Block Lanzcos Method) was finished by using ANSYS post-processing modules, DOWN structure, star-shaped frame structure and the overall structure of the cabin, had modal analysis, respectively, given in the first ten frequency and formation.