Modal vibration control of an active surface telescope

Peter C. Parziale; David R. Smith

doi:10.1117/12.239050

1 May 1996 Modal vibration control of an active surface telescope

Peter C. Parziale, David R. Smith

Proceedings Volume 2717, Smart Structures and Materials 1996: Smart Structures and Integrated Systems; (1996) https://doi.org/10.1117/12.239050
Event: 1996 Symposium on Smart Structures and Materials, 1996, San Diego, CA, United States

Abstract

The large millimeter-wave telescope (LMT), a bi-national project between the U.S. and Mexico, is a 50 m diameter radio telescope which will operate at 1 mm wavelengths. To achieve its surface accuracy requirements, the telescope relies on an actively controlled primary surface. A telescope reflecting surface is usually subjected to slowly varying loads. However, environmental conditions, as well as those observing techniques which require high accelerations, excite vibration in the structure. In a conventional telescope, the observer must wait for the vibration to decay naturally before continuing an observation. However, for a telescope such as the LMT, the mass of the surface and the large number of actuators can be used to add damping to the support structure. This paper investigates the use of active surfaces in vibrational damping of their supporting structures. This is accomplished by using the surface sensors to determine the modes present in the vibration of backstructure and using the surface control system to damp the dominant modes. The surface figure is controlled simultaneously.

Citation Download Citation

Peter C. Parziale and David R. Smith "Modal vibration control of an active surface telescope", Proc. SPIE 2717, Smart Structures and Materials 1996: Smart Structures and Integrated Systems, (1 May 1996); https://doi.org/10.1117/12.239050

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