Structural analysis of ground-based large telescopes

Chao, 周超 Zhou; Hong-bo, 杨洪波 Yang; Xiao-xia, 吴小霞 Wu; Jing-xu, 张景旭 Zhang

doi:10.3788/ope.20111901.0138

Cited by 1 publication

(2 citation statements)

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“…The system-level finite element models of almost all telescopes abroad were built. The responses under all kinds of loads have been analysed and proved, lots of results and experiences have been obtained [1] . Firstly the whole finite element model is built in which the primary mirror(MA) and secondary mirror(MB) are substituted by mass elements, so that the relative offsets and tilt angles can be worked out.…”

Section: Song (Stellar Oscillations Network Groupmentioning

confidence: 99%

“…The model is properly simplified on the premise that the accuracy of analyses is influenced lighted in order to make the model not too complex. Nearly all the structures of SONG telescope are shell shapes, so the SHELL63 element is used to simulated the rack; In the process of analyses, the surface shapes of MA and MB are not researched, what are paid attention to is the relative position of MA and MB, so MA and MB are simulated by MASS21 element [1] . The up truss and down truss are simulated by PIPE16 element whose shape is the same with them.…”

Section: Finite Element Model Of Songmentioning

confidence: 99%

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Modeling and Simulation of Chinese SONG Telescope

Gao

Wang

2013

AMR

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Telescope structure is used to support and position the optical mirrors in the right place during the period of telescope observation, so it will have such capability to withstand a certain load. In order to ensure SONG telescope has such capability, FEM analysis and calculation are finished in this paper. With the help of ANSYS, firstly the finite element model of SONG telescope is built. Then using this model, the analysis and calculation of static and dynamic are performed, including the deformation under the gravity load with the tube in different directions, eigenfrequency calculation of the whole system and the responses under the seismic acceleration spectra. The results show that the max. offsets and max. relative tilt angles between primary mirror and secondary mirror are very little under the gravity load. The first natural frequency is 20.083Hz, larger than the design requirement 8Hz. The results of seismic load analysis show that the deformation in the telescope structure is 0.42mm and the stress is 33.8MPa, less than the allowable stress of the structure material. The above analyses verified that the structure design of SONG telescope is reliable and acceptable.

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Section: Song (Stellar Oscillations Network Groupmentioning

confidence: 99%

Section: Finite Element Model Of Songmentioning

confidence: 99%