Identification of Resonant Frequencies in LIGO-like Suspension with Finite-Element Modeling. (arXiv:2306.13755v1 [gr-qc])
<a href="http://arxiv.org/find/gr-qc/1/au:+Sauter_O/0/1/0/all/0/1">Orion Sauter</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Bhagwat_N/0/1/0/all/0/1">Ninad Bhagwat</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Conklin_J/0/1/0/all/0/1">John Conklin</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Tanner_D/0/1/0/all/0/1">D.B. Tanner</a>
Following the upgrades to Advanced LIGO (aLIGO), measurements were made of
the detector suspensions’ frequency response characteristics. While most
resonant frequencies could be identified with simple mechanical models, such as
the fiber vibration modes, some were unexplained. Using a finite element model
of the quadruple pendulum suspension, we search for and identify these
frequencies. By modeling these response frequencies we can suggest methods to
reduce their amplitude, alter their frequency, or eliminate them in future
gravitational wave detector designs.
Following the upgrades to Advanced LIGO (aLIGO), measurements were made of
the detector suspensions’ frequency response characteristics. While most
resonant frequencies could be identified with simple mechanical models, such as
the fiber vibration modes, some were unexplained. Using a finite element model
of the quadruple pendulum suspension, we search for and identify these
frequencies. By modeling these response frequencies we can suggest methods to
reduce their amplitude, alter their frequency, or eliminate them in future
gravitational wave detector designs.
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