@Article{ConstâncioJrAguKeiMalLem:2014:CoNePe,
               author = "Const{\^a}ncio Junior, M{\'a}rcio and Aguiar, Odylio Denys de 
                         and Keiser, G. McCurrach and Malheiro, M. and Lemos, L. J. 
                         Rangel",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and Stanford Univ, 
                         Stanford, CA 94305 USA.; Inst Tecnol Aeronaut, BR-12228900 Sao 
                         Jose Dos Campos, SP, Brazil. and Inst Tecnol Aeronaut, BR-12228900 
                         Sao Jose Dos Campos, SP, Brazil. and Inst Tecnol Aeronaut, 
                         BR-12228900 Sao Jose Dos Campos, SP, Brazil.; Univ Fed Tocantins, 
                         BR-77824838 Araguaina, TO, Brazil.",
                title = "Do coupled nested pendula have the same eigenfrequencies as 
                         pendula in cascade?",
              journal = "Journal of Instrumentation",
                 year = "2014",
               volume = "9",
                month = "Aug.",
             keywords = "Overall mechanics design (support structures and materials, 
                         vibration analysis etc), Suspensions, Instrument optimisation.",
             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.",
                  doi = "10.1088/1748-0221/9/08/T08006",
                  url = "http://dx.doi.org/10.1088/1748-0221/9/08/T08006",
                 issn = "1748-0221",
                label = "isi 2014-11 AguiarKeiMalLem:2014:CoNePe",
             language = "en",
        urlaccessdate = "27 abr. 2024"
}