Local effects on E-ELT global performance: two examples for requirement verification

B. Sedghi; M. Muller; F. Koch; L. Pettazzi

doi:10.1117/12.915504

10 November 2011 Local effects on E-ELT global performance: two examples for requirement verification

B. Sedghi, M. Muller, F. Koch, L. Pettazzi

Proceedings Volume 8336, Integrated Modeling of Complex Optomechanical Systems; 83360O (2011) https://doi.org/10.1117/12.915504
Event: Integrated Modeling of Complex Optomechanical Systems, 2011, Kiruna, Sweden

Abstract

In this paper two case studies, highlighting the role of the integrated modeling in the performance prediction and requirement verification of the E-ELT are presented. First example discusses the effect of the local wind load on the secondary mirror and the global wavefront error. Analysis and simulations showed that such local effect is one of the main contributors to the telescope error budget. A detailed modeling and simulation approach with the possibility to modify some important mechanical and control parameters led to a better understanding of the problem and searching for appropriate mitigation strategies. In the second example the effect of friction devices of the lateral support of the azimuth structure is presented. Such devices were originally proposed by the telescope structure contractor to reduce the induced stresses and force due to the temperature variations. A detailed modeling of the friction devices and its inclusion into the telescope dynamical model revealed that some performance and interface requirements are violated.

Citation Download Citation

B. Sedghi, M. Muller, F. Koch, and L. Pettazzi "Local effects on E-ELT global performance: two examples for requirement verification", Proc. SPIE 8336, Integrated Modeling of Complex Optomechanical Systems, 83360O (10 November 2011); https://doi.org/10.1117/12.915504

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