Topologic optimization for configuration design of web-skin-type ground structure based large-aperture space mirror

Shu-tian, 刘书田 Liu; Rui, 胡瑞 Hu; Ping, 周平 Zhou; Zhi-gang, 董志刚 Dong; Ren-ke, 康仁科 Kang

doi:10.3788/ope.20132107.1803

Cited by 5 publications

(3 citation statements)

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“…A conclusion can be obtained that this bearing arrangement can't disperse the load to the left arm of the yoke, which makes the first modal frequency lower than the modal analysis result. The first modal frequency can be estimated by this approach [6] [8] . 1 1 11.9 2 g fHz πδ == (5) Another result of 15.6Hz can be calculated by the modal analysis.…”

Section: The First Arrangementmentioning

confidence: 99%

Study of tilt axis bearing arrangement for M3S of TMT project

et al. 2014

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The tertiary mirror positioned assembly (M3PA) of the thirty meters telescope (TMT) is the largest tertiary mirror pointing system in the world. The tracking and pointing performance of M3PA is better than any other telescopes which have been built, and the working condition is even worse, so the designers face an enormous challenge. The tracking system includes the bottom rotator shaft and the tilt shaft. The study of this paper focuses on the tilt shaft. There are mainly three forms. The first form is one end fixed with the other unrestrained in axial direction. The second form uses two pairs of angular contact ball bearing. The last form lays two tape roller bearings. All of them can meet the requirements when the M3PA is vertical. But the first one becomes invalid when the M3PA is horizontal. We pay our attention on the study for the second arrangement method.. This bearing arrangement can produce a good stiffness, and increase the first modal frequency to 15.1Hz. In addition, some analysis were down to study the load applied on the balls. The results show that the maximum load is up to 5000N with the stress of 2300MPa.

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Section: The First Arrangementmentioning

confidence: 99%

Study of tilt axis bearing arrangement for M3S of TMT project

et al. 2014

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“…In order to reduce the computation complexity, in most existing literatures [3][4][5][6][7][8][9], the PV value of the surface is often used for the design constrain for the topology optimization, then the RMS value is used to check the design result. However, according to the definition, PV value is the displacement between the maximum displacement node and the minimum displacement node, which is not suitable to describe the mirror surface accuracy.…”

Section: Frontiers Of Manufacturing Science and Measuring Technology IVmentioning

confidence: 99%

“…According to existing literatures, lots of work have been carried out under the gravity condition to get the reasonable structure of the scanning mirror. Structures with triangle, quadrilateral or hexagonal openings[3] are designed to lighten the mirror, while topology optimization method based on SIMP method [4][5][6][7][8] is also used in lightweight design. Considering that scanning mirror is a rotating mirror, the rotating speed influences the dynamic surface accuracy more than gravity does.…”

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confidence: 99%

Scanning Mirror Topology Optimization of the Imaging Spectrometer

Cong

2014

AMM

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In order to obtain high dynamic RMS performance of the scanning mirror in the working condition, the topology optimization method based on the constrain of dynamic deformation was carried out. Effective simplifications are implemented to reduce the complexity of the calculation. With the topology method, a lightweight form of the scanning mirror was generated on the dynamic working condition. The result shows that the lightweight ratio of the optimized structure is 47.4%, the PV value is 19.36nm and the RMS value is 5.65nm, which is improved by 18.46% and 17.41%, respectively. Besides, the first order frequency has increased by 113.8Hz. The results illustrate that the proposed method for the optimization of the scanning mirror is reasonable and practically.

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TMT tertiary mirror axis calibration with laser tracker

Zhang

Yang

et al. 2015

Optoelectron. Lett.

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Topologic optimization for configuration design of web-skin-type ground structure based large-aperture space mirror

Cited by 5 publications

References 0 publications

Study of tilt axis bearing arrangement for M3S of TMT project

Study of tilt axis bearing arrangement for M3S of TMT project

Scanning Mirror Topology Optimization of the Imaging Spectrometer

TMT tertiary mirror axis calibration with laser tracker

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