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Analysis of Pre-Stress and Structural Characteristic of Space Film Reflect-Array

Author: HuYu
Tutor: DongShiZuo；ChenWuJun
School: Shanghai Jiaotong University
Course: Civil Engineering
Keywords: space film reflect-array analysis of pre-stress modal analysis analysis of wrinkle modal test initial defect laser vibrometer flatness
CLC: TU38
Type: Master's thesis
Year: 2012
Downloads: 72
Quote: 1
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Abstract


The space planar film reflect-array that can be used for space solar sail for exploration and radar antenna, is gaining more and more research attention for its remarkable characteristics as light in weight, well in vibration resistance.Space film reflect-array stiffness depends mainly on the shape of edge and value of pre-stress. Structural analysis of film is based on the analysis of pre-stress, the key area of analysis of film structural pre-stress is effect and influence factors of film structural with pre-stress imported. This paper, based on a specific film reflect-array structure as the object of investigation, analyzes several aspects including structural pre-stress of film reflect-array, the film reflect-array structural influence factors, film reflect-array wrinkling, numerical simulation and verification of film vibration test.Space film reflect-array, whose outline dimension is 39066mm? 9894mm,is used as the numerical object, whose structural characteristics and modals are analyzed by breaking up the film reflect-array structure. Moreover, the whole structural model is also analyzed, and the reasonable structural type of the film reflect-array is as well as considered.In order to guide practice of engineering,the effect factors of overall structural rigidity of the pre-stress of film reflect-array is considered. Structural modals of film reflect-array are calculated when the aerial density of film reflect-array is individually 150 g/m2,200g/m2,200 g/m2 and pre-stress of film reflect-array is 18psi,25psi,50psi,the frequencies of film reflect-array increase by 23.1%,22.2%,18.9%.When pre-stress of film reflect-array is the same ,the three aerial densities decrease by 11.5%,9.1%,14.8%.It can be seen that there are greater influences variation of pre-stress of film reflect-array than variation of the aerial density of film reflect-array. After the stiffness of the space film reflect-array be calculated, experimental verification of film structural modal is required. The circular curve film reflect-array, which is made from 25?m Mylar and whose outline dimension is 325?445mm, at edge rise-span ratio 210 is designed, and mechanism of tension which was developed by Shanghai Aerospace System Engineering Institute is used to load the film reflect-array, however, laser vibrometer is used to identify modals. Modals are compared to the results of numerical simulation. The result of test shows that the shapes between experimental modal and numerical simulation are consistent,but there are difference frequencies value among the corresponding modals. Space film reflect-array is used as the numerical object, and thebehavior characteristic of large film reflect-array is considered, and analyzes several effect factors on producing wrinkle including geometry of film reflect-array、pre-stress of film reflect-array、initial defect、the node of non-uniform tension.In the final part of this paper, the research is summarized, and the future developing direction is pointed out.

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