scholarly journals Obtaining the frequencies of Schenberg detector sphere using finite element modelling

2021 ◽  
Vol 2090 (1) ◽  
pp. 012161
Author(s):  
F S Bortoli ◽  
R N Duarte ◽  
R C Souza ◽  
N S Magalhaes ◽  
C Frajuca ◽  
...  
Keyword(s):  
Finite Element ◽  
Gravitational Wave ◽  
Center Of Mass ◽  
Normal Modes ◽  
Central Frequency ◽  
Detector Performance ◽  
Wave Detector ◽  
Spherical Mass ◽  
Spherical Detector ◽  
Outer Environment

Abstract The resonant-mass gravitational wave detector SCHENBERG is a spherical detector that operates with a central frequency close to 3200 Hz and a bandwidth around 200 Hz. It has a spherical mass that works as an antenna whose weight is 1150 kg and is connected to the outer environment by a suspension system designed to attenuate local noise due to seism as well as other sources; the sphere is suspended by its center of mass. When a gravitational wave passes by the detector, the antenna is expected to vibrate. This motion should be monitored by six parametric microwave transducers whose output signals will be digitally analyzed. In order to determine the detector performance better, it is necessary to obtain the vibration frequencies of the sphere with a better precision. To achieve such a goal the sphere with the holes to mount the transducers and the central hole from which the sphere is suspended is simulated in a finite element method program when the gravity is applied to the sphere and the deformation is kept. After that the vibration normal modes of the sphere are calculated and they are compared to the experimental results.

A CHAOTIC GRAVITATIONAL WAVE DETECTOR

1998 ◽  
Vol 13 (20) ◽  
pp. 1653-1665 ◽  
Author(s):  
JOHN ARGYRIS ◽  
CORNELIU CIUBOTARIU
Keyword(s):  
Gravitational Wave ◽  
Josephson Junction ◽  
Gravitational Waves ◽  
Quantum Chaos ◽  
Center Of Mass ◽  
Computer Experiments ◽  
High Sensitivity ◽  
Gravitational Wave Detector ◽  
Single Junction ◽  
Wave Detector

In this letter we signalize the possibility of applying a quantum chaos as an element of high sensitivity which serves to detect small changes in length generated by gravitational waves. We propose the construction of a double-bar antenna with a coupling Josephson junction in its center-of-mass. In fact the new antenna is a single Josephson junction with massive bulk contacts, like a single-junction SQUID but with free ends. Computer experiments demonstrate that very small changes generated by the variation of the distance between the bulk plates of the junction capacitance will produce a variety of very different intermittency routes to chaos. A concrete numerical example illustrates the smallness of a quantum of chaos and thus the extraordinary sensitivity of the proposed method.

scholarly journals China’s first step towards probing the expanding universe and the nature of gravity using a space borne gravitational wave antenna

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Keyword(s):  
Gravitational Wave ◽  
Hubble Constant ◽  
Gravitational Wave Detector ◽  
Expanding Universe ◽  
Satellite Mission ◽  
Gravitational Wave Detection ◽  
Wave Detection ◽  
Wave Detector ◽  
Wave Antenna ◽  
Gravitational Wave Antenna

AbstractIn this perspective, we outline that a space borne gravitational wave detector network combining LISA and Taiji can be used to measure the Hubble constant with an uncertainty less than 0.5% in ten years, compared with the network of the ground based gravitational wave detectors which can measure the Hubble constant within a 2% uncertainty in the next five years by the standard siren method. Taiji is a Chinese space borne gravitational wave detection mission planned for launch in the early 2030 s. The pilot satellite mission Taiji-1 has been launched in August 2019 to verify the feasibility of Taiji. The results of a few technologies tested on Taiji-1 are presented in this paper.

A noise model for the Brazilian gravitational wave detector  Mario Schenberg 

2004 ◽  
Vol 21 (5) ◽  
pp. S1107-S1111 ◽  
Author(s):  
Carlos Frajuca ◽  
Kilder L Ribeiro ◽  
Luiz A Andrade ◽  
Odylio D Aguiar ◽  
Nadja S Magalhães ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
Noise Model ◽  
Gravitational Wave Detector ◽  
Wave Detector

scholarly journals Gravitational wave–gauge field dynamics

2017 ◽  
Vol 26 (12) ◽  
pp. 1742005 ◽  
Author(s):  
R. R. Caldwell ◽  
C. Devulder ◽  
N. A. Maksimova
Keyword(s):  
Quantum Gravity ◽  
Gravitational Wave ◽  
Gravitational Waves ◽  
Gauge Field ◽  
Linear Combination ◽  
Effective Mass ◽  
Normal Modes ◽  
New Approaches ◽  
Insight Into

The dynamics of a gravitational wave propagating through a cosmic gauge field are dramatically different than in vacuum. We show that a gravitational wave acquires an effective mass, is birefringent, and its normal modes are a linear combination of gravitational waves and gauge field excitations, leading to the phenomenon of gravitational wave–gauge field oscillations. These surprising results provide an insight into gravitational phenomena and may suggest new approaches to a theory of quantum gravity.

The Munich gravitational-wave detector

1976 ◽  
Vol 33 (2) ◽  
pp. 665-680 ◽  
Author(s):  
H. Billing ◽  
W. Winkler
Keyword(s):  
Gravitational Wave ◽  
Gravitational Wave Detector ◽  
Wave Detector

Characterization of Nonlinear Coupled Dynamics in Sandwich Structures

2008 ◽  
Author(s):  
Ioannis T. Georgiou
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Geometric Nonlinearity ◽  
Sandwich Structures ◽  
Normal Modes ◽  
Element Model ◽  
Nonlinear Normal Modes ◽  
High Fidelity ◽  
Coupled Dynamics ◽  
Nonlinear Normal

In this work, the nonlinear coupled dynamics of a sandwich structure with hexagonal honeycomb core are characterized in terms of Proper Orthogonal Decomposition modes. A high fidelity nonlinear finite element model is derived to describe geometric nonlinearity and displacement and rotation fields that govern the coupled dynamics. Contrary to equivalent continuum models used to predict vibration properties of lattice and sandwich structures, a high fidelity finite element model allows for a quite detailed description of the distributed complicated geometric nonlinearity of the core. It was found that the free dynamics excited by a blast load and the forced dynamics excited by a harmonic force posses POD modes which are localized in space and time. The processing of the simulated dynamics by the Time Discrete Proper Transform forms a means to study the nonlinear coupled dynamics of sandwich structures in the context of nonlinear normal modes of vibration and reduced order models.

Accurate calibration technique for a resonant-mass gravitational wave detector

2000 ◽  
Vol 71 (11) ◽  
pp. 4282 ◽  
Author(s):  
Michael E. Tobar ◽  
Clayton R. Locke ◽  
Eugene N. Ivanov ◽  
Ik Siong Heng ◽  
David G. Blair
Keyword(s):  
Gravitational Wave ◽  
Gravitational Wave Detector ◽  
Calibration Technique ◽  
Wave Detector
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