A proposal for improving the noise floor of the gravitational wave antenna Niobè

Ribeiro, K L; Ivanov, Eugene; Blair, David; Tobar, Michael E.; Aguiar, O. D.; Frajuca, Carlos

doi:10.1088/0264-9381/19/7/400

Cited by 6 publications

(4 citation statements)

References 6 publications

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“…The authors forms a interdisciplinary group, what makes these studies possible, to check it go to references [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35].…”

Section: Acknowledgementsmentioning

confidence: 99%

Study of Geometries and Stability for Energy Density in Electromechanical Battery Flywheels with a Gaussian Shape

Coppede,

Silva Bortoli,

Goncalves de Moura

et al. 2024

J. Phys.: Conf. Ser.

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A study on flywheels materials and geometries is presented here with the use of finite element modeling (FEM) simulations. The study analyzes the stress behavior of flywheel rotors subject to the rotational speed that creates the maximum stress that the flywheel can support, and then calculates the rotational energy mass ratio for each geometry. The obtained geometry was Gaussian section for the Flywheel rotor. The material used in this case study is carbon fiber Hexcel UHM 12000. The best results were a rotational speed of ≈ 279.000 rpm and rotational energy density of ≈ 440 Wh/kg. Then, to increase the total energy, Flywheel with 2 and 3 rotors were analyzed. Then the stability under rotation of these Flywheels were analyzed, some instability was found and a solution was presented.

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“…The authors forms a interdisciplinary group, what makes these studies possible, to check it go to references [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35].…”

Section: Acknowledgementsmentioning

confidence: 99%

Study of Geometries and Stability for Energy Density in Electromechanical Battery Flywheels with a Gaussian Shape

Coppede,

Silva Bortoli,

Goncalves de Moura

et al. 2024

J. Phys.: Conf. Ser.

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“…We believe this mechanical innovation in the transducer design was a good decision in order to increase the antenna's sensitivity and to reach the standard quantum limit (Caves et al 1980;Braginskii et al 1980). The drastic change in the last mass of the antenna-transducer's resonant chain from the Niobe bending flap mass, which was around 0.43 kg, to just 10 mg (Ribeiro et al 2002) gave this kind of transducer many advantages. Firstly, the pump requirement of phase noise to achieve the standard quantum limit of sensitivity dropped from -180 dBc Hz −1 to only -145 dBc Hz −1 , which is a much more feasible goal.…”

Section: The Spherical Antennae and Other Resonant-mass Proposals For...mentioning

confidence: 99%

Past, present and future of the Resonant-Mass gravitational wave detectors

Aguiar

2010

Res. Astron. Astrophys.

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Resonant-mass gravitational wave detectors are reviewed from the concept of gravitational waves and its mathematical derivation, using Einstein's general relativity, to the present status of bars and spherical detectors, and their prospects for the future, which include dual detectors and spheres with non-resonant transducers. The review not only covers technical aspects of detectors and sciences that will be done, but also analyzes the subject in a historical perspective, covering the various detection efforts over four decades, starting from Weber's pioneering work.

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“…We believe the change in the transducer design was a good decision in order to increase the antenna sensitivity and to reach the standard quantum limit [17]. The drastic change in the last mass from the Niobè bending flap mass, which was around 0.43 kg [18], to just 10 mg gave this kind of transducer many advantages. First, the pump requirement of phase noise to achieve the standard quantum limit of sensitivity dropped from −180 dBc Hz −1 to only −145 dBc Hz −1 , which is a much more feasible goal.…”

Section: A/d Convertermentioning

confidence: 99%

The Brazilian spherical detector: progress and plans

Aguiar¹,

Andrade²,

Barroso³

et al. 2004

Class. Quantum Grav.

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We are building the Schenberg gravitational wave detector at the Physics Institute of the University of São Paulo as programmed by the Brazilian Graviton Project. The antenna and its vibration isolation system are already built, and we have made a first cryogenic run for an overall test, in which we measured the antenna mechanical Q (figure of merit). We also have built a 10.21 GHz oscillator with phase noise performance better than −120 dBc at 3.2 kHz to pump an initial CuAl6% two-mode transducer. We plan to prepare this spherical antenna for a first operational run at 4.2 K with a single transducer and an initial target sensitivity of h ∼ 2 × 10−21 Hz−1/2 in a 50 Hz bandwidth around 3.2 kHz soon. Here we present details of this plan and some recent results of the development of this project.

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A proposal for improving the noise floor of the gravitational wave antenna Niobè

Cited by 6 publications

References 6 publications

Study of Geometries and Stability for Energy Density in Electromechanical Battery Flywheels with a Gaussian Shape

Study of Geometries and Stability for Energy Density in Electromechanical Battery Flywheels with a Gaussian Shape

Past, present and future of the Resonant-Mass gravitational wave detectors

The Brazilian spherical detector: progress and plans

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