Do coupled nested pendula have the same eigenfrequ... - BV FAPESP
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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Do coupled nested pendula have the same eigenfrequencies as pendula in cascade?

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Author(s):
Constancio, Jr., M. [1] ; Aguiar, O. D. [1] ; Keiser, G. McCurrach [2, 3] ; Malheiro, M. [2] ; Lemos, L. J. Rangel [2, 4]
Total Authors: 5
Affiliation:
[1] INPE, MCTI, BR-12227010 Sao Jose Dos Campos, SP - Brazil
[2] Inst Tecnol Aeronaut, BR-12228900 Sao Jose Dos Campos, SP - Brazil
[3] Stanford Univ, Stanford, CA 94305 - USA
[4] Univ Fed Tocantins, BR-77824838 Araguaina, TO - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Journal of Instrumentation; v. 9, AUG 2014.
Web of Science Citations: 0
Abstract

Over the last few years, several vibration isolation projects for gravitational wave detectors have been proposed. Some of them are related to N-stages cascaded systems which can achieve great factors of attenuation. However, these systems are usually very tall, which makes it difficult to build an efficient vaccum chamber for them. For this reason, this paper makes a comparison between a theoretical N-stage cascaded pendula with an experimental N-stage nested one. Preliminary results show that their resonant modes are very similar. The ratio between the results of experiment and theory is between 0.94 and 1.01 for the pendular modes and systematically close to 1.05 for the rotational modes. This result implies that an N-stage nested pendula set of about 1.4m height can have resonant modes similar to a cascaded pendula set of about 6.6m, which may suggests that a nested system can be theoretically treated as a cascaded one. So, the development of nested pendula can be an effective alternative of vibration isolation systems for future generations of gravitational wave detectors. (AU)

FAPESP's process: 12/22752-1 - Multi-nested pendula: a new cryogenic vibrational isolation system for the Advanced LIGO gravitational waves detector
Grantee:Marcio Constâncio Junior
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 06/56041-3 - New physics from space: gravitational waves
Grantee:Odylio Denys de Aguiar
Support Opportunities: Research Projects - Thematic Grants