Characterization of mechanical dissipation spectral behavior using a gravitomagnetic pendulum |
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| Institution: | 1. INFN Sezione di Roma, P.le A. Moro 2, Roma-00185, Italy;2. Univ. of Rome “La Sapienza”, Roma, Italy;3. Accelerator Laboratory KEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305, Japan;1. Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, China;2. CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei, China;1. KAGRA Observatory, Institute for Cosmic Ray Research, The University of Tokyo, 5-1-5 Kashiwa-no-Ha, Kashiwa, Chiba 277-8582, Japan;2. Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;1. KAGRA Observatory, ICRR, The University of Tokyo, Hida, Gifu 506-1205, Japan;2. Department of Astronomy, Beijing Normal University, Beijing 100875, China;3. Gravitational Wave Science Project, National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan;4. Division of Particle and Astrophysical Sciences, Nagoya University, Nagoya, Aichi, 464-8602, Japan |
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| Abstract: | We have developed an experimental method based on the reaction of a magnetic mass with respect to a dc biased coil to change the frequency of a pendulum. In a preliminary experiment this method has allowed us to investigate the mechanical dissipation of nylon pendulum wires over the 0.1-1.4 Hz frequency range. According to the procedure shown in this paper, it is possible to deduce from the measurements whether the dissipation process is viscous or not. The method is generally applicable and adaptable to be used to characterise the behaviour of the suspension systems developed for gravitational waves detectors. |
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