Instrument for measuring the quality factor and internal friction of resonant systems

1981 ◽  
Vol 24 (4) ◽  
pp. 295-297
Author(s):  
B. N. Konshin ◽  
A. P. Tarasenko
Keyword(s):  
Internal Friction ◽  
Quality Factor ◽  
Resonant Systems

Design to Operational Parameters Dependency on Quality Factor of Sensor Mechanical Resonators

2021 ◽  
Vol 29 (2) ◽  
pp. 3-34
Author(s):  
G.N. Sharma ◽  
◽  
Sundararajan T. ◽  
G.S. Singh ◽  
◽  
...  
Keyword(s):  
Internal Friction ◽  
Quality Factor ◽  
Ring Resonators ◽  
Future Research ◽  
Operating Pressure ◽  
Q Factor ◽  
Operational Parameters ◽  
Mechanical Resonator ◽  
Macro Scale ◽  
Anchor Loss

The critical functional part of any high performance resonance based sensor is a mechanical resonator. The performance is measured by resonator quality factor (Q-factor). Damping mechanisms such as thermoelastic damping (TED), anchor loss, surface loss, material internal friction, fluid damping and electronics damping are covered in this review with more focus on gyroscope resonators. Dissipations can be reduced by different means. Hence, the effects of various design to operational parameters on the Q-factor for different configurations, sizes and materials are reviewed in detail. Micro scale ring resonators can achieve a Q-factor of the order of hundreds of thousands. Macro scale hemispherical resonators are suitable for ultrahigh Q-factors. High temperature sensor operation is not preferred because of TED, while sub-zero operation is limited by material internal friction. Few orders of dissipation increase are seen with thin film metallic coating due to TED and coating material internal friction. High precision fabrication is mandatory to achieve the designed minimum anchor loss as it is highly sensitive to fabrication imperfections. Q-factor sensitivity to operating pressure is different for different resonator configurations. This review study helps to build a comprehensive mechanical resonator design, realization and operation strategy to achieve high sensor performance. A roadmap on future research requirements for developing compact mass producible CVG type sensors with ultrahigh Q-factor is also highlighted.

scholarly journals High quality factor electromagnetically induced transparency-like effect in coupled guided-mode resonant systems

2019 ◽  
Vol 27 (5) ◽  
pp. 7712 ◽  
Author(s):  
Yunxin Han ◽  
Junbo Yang ◽  
Xin He ◽  
Jie Huang ◽  
Jingjing Zhang ◽  
...  
Keyword(s):  
Quality Factor ◽  
Electromagnetically Induced Transparency ◽  
High Quality Factor ◽  
High Quality ◽  
Guided Mode ◽  
Resonant Systems ◽  
Induced Transparency

scholarly journals Amplitude Dependent Internal Friction in Strained Magnesium Alloys of AZ Series

Crystals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 608
Author(s):  
Milan Uhríčik ◽  
Zuzana Dresslerová ◽  
Peter Palček ◽  
Mária Chalupová ◽  
Zuzanka Trojanová ◽  
...  
Keyword(s):  
Internal Friction ◽  
Quality Factor ◽  
Magnesium Alloys ◽  
Strain Amplitude ◽  
Room Temperature ◽  
Dislocation Line ◽  
Maximum Strain ◽  
Critical Amplitude ◽  
Solute Atoms

Amplitude dependent internal friction (ADIF) was measured in three AZ magnesium alloys. Two types of experiments were performed: ADIF was measured step by step with the increasing strain amplitude and ADIF was measured after predeformation of samples in torsion. All experiments were done at room temperature. The quality factor was used as a measure of internal friction (IF). The quality factor decreased in the region of smaller amplitudes, and approaching some critical amplitude, εcr, rapidly increased. This critical amplitude increased with increasing maximum strain amplitude and predeformation of samples up to ~6%. Such behavior can be explained by considering mobile solute atoms, which may migrate along the dislocation line in the region of smaller amplitudes and perpendicular to the dislocation line in the region of higher amplitudes. A competition between dragging and depinning of solute atoms with dislocation lines may very well explain the measured dependencies.

Memory-efficient displacement-based internal friction for wave propagation simulation

Geophysics ◽  
2011 ◽  
Vol 76 (6) ◽  
pp. T131-T145 ◽  
Author(s):  
Jacobo Bielak ◽  
Haydar Karaoglu ◽  
Ricardo Taborda
Keyword(s):  
Wave Propagation ◽  
Internal Friction ◽  
Quality Factor ◽  
Half Space ◽  
Seismic Waves ◽  
Friction Model ◽  
Three Dimensions ◽  
Proposed Model ◽  
In Series ◽  
Displacement Based

The characterization of anelastic losses due to material internal friction has become increasingly important in geophysical exploration and other seismological applications, as these losses greatly affect the amplitude and dispersion of seismic waves. Anelasticity is usually specified in terms of the material’s quality factor, [Formula: see text]. Different viscoelastic models have been used to represent [Formula: see text] as a function of frequency. Most of these models are defined in terms of stresses and strains as the primary variables. Thus, in three dimensions, a separate model needs to be associated with each of the six strain components. We introduce an internal friction model that uses, instead, displacements as primary variables. For a fiber, the proposed model consists of a set of three distinct elements in parallel with different relaxation mechanisms: namely, two elements that consist of a spring and a dashpot in series (Maxwell) and a third element that consists of a spring and a dashpot in parallel (Voigt). In addition to saving memory, this formulation is particularly suitable for finite-element schemes. The model exhibits an almost constant quality factor within the frequency range of interest, with a tolerance of 5% with respect to the target [Formula: see text] value, and provides a close approximation to the variation of the phase-velocity with frequency—as has been observed in empirical data. The extension of this model to 3D anelastic problems and its use in idealized cases, such as an infinite-space, a half-space, and a layered half-space, and the comparison of results with semi-analytical reference solutions obtained from theory and previous, similar studies, corroborates the validity of the proposed model for incorporating anelastic losses in wave propagation problems.

Internal friction in a martensitic high-carbon steel

2001 ◽  
Vol 81 (12) ◽  
pp. 2797-2808
Author(s):  
Rustem Bagramov, Daniele Mari, Willy Benoi
Keyword(s):  
Carbon Steel ◽  
Internal Friction ◽  
High Carbon Steel ◽  
High Carbon

A simple system to measure internal friction and creep

1992 ◽  
Vol 2 (9) ◽  
pp. 1779-1786
Author(s):  
A. M. Bastawros ◽  
M. Z. Said
Keyword(s):  
Internal Friction ◽  
Simple System

Internal friction and some other properties of shape memory Fe-Mn-Si based alloys

2003 ◽  
Vol 112 ◽  
pp. 397-400 ◽  
Author(s):  
P. G. Yakovenko ◽  
O. Söderberg ◽  
K. Ullakko ◽  
V. K. Lindroos
Keyword(s):  
Internal Friction ◽  
Shape Memory

LOW TEMPERATURE INTERNAL FRICTION OF COLD WORKED ZIRCONIUM

1971 ◽  
Vol 32 (C2) ◽  
pp. C2-209-C2-213 ◽  
Author(s):  
E. J. SAVINO ◽  
E. A. BISOGNI
Keyword(s):  
Low Temperature ◽  
Internal Friction ◽  
Cold Worked

INTERNAL FRICTION IN RHENIUM

1971 ◽  
Vol 32 (C2) ◽  
pp. C2-179-C2-181
Author(s):  
M. RAADSCHELDERS ◽  
R. DE BATIST
Keyword(s):  
Internal Friction
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