P2F-7 Acoustic Wave Amplitude Estimation Based on Harmonic Distortion in Water

2006 ◽  
Author(s):  
N. de Jong ◽  
G. M. Matte ◽  
J. Borsboom ◽  
M. D. Verweij
Keyword(s):  
Acoustic Wave ◽  
Wave Amplitude ◽  
Harmonic Distortion ◽  
Amplitude Estimation

Nonlinear Interaction of Acoustical Waves Due to Cracks and Its Possible Usage for Cracks Detection

1995 ◽  
Vol 1 (3) ◽  
pp. 335-344 ◽  
Author(s):  
V. Yu. Zaitsev ◽  
A.M. Sutin ◽  
I. Yu. Belyaeva ◽  
V.E. Nazarov
Keyword(s):  
Acoustic Wave ◽  
Nonlinear Interaction ◽  
Crack Detection ◽  
Wave Amplitude ◽  
Acoustic Pulse ◽  
Transmitted Wave ◽  
New Method ◽  
Nonlinear Properties ◽  
Reflected Wave ◽  
Crack Type

An interaction of a CW acoustic wave and a powerful acoustic pulse due to nonlinear properties of a crack-type discontinuity in a solid is considered. Characteristics of nonstationary variations of the reflected wave amplitude and the phase of the transmitted wave, which are induced by the powerful pulse, are determined. The effects should allow one to distinguish cracks from other scatterers and can be used as a base of a new method of crack detection and positioning. Demonstrative signal estimates based on two simplified crack models are presented.

Characterization of rock discontinuity openings using acoustic wave amplitude — Application to a metamorphic rock mass

2015 ◽  
Vol 193 ◽  
pp. 402-411 ◽  
Author(s):  
Laurent Peyras ◽  
Patrice Rivard ◽  
Pierre Breul ◽  
Adrien Millet ◽  
Gérard Ballivy
Keyword(s):  
Rock Mass ◽  
Acoustic Wave ◽  
Metamorphic Rock ◽  
Wave Amplitude ◽  
Rock Discontinuity

The Research on the Model for Calculating Relative Acoustical Amplitude on Interface I Based on Attenuation Theory of Acoustic Wave

2012 ◽  
Vol 229-231 ◽  
pp. 2638-2642
Author(s):  
Chi Ai ◽  
Xiang Meng ◽  
Ming Hao ◽  
Wan Chun Zhao ◽  
Hui Zhi Zhao
Keyword(s):  
Energy Consumption ◽  
Acoustic Wave ◽  
Wave Amplitude ◽  
Wave Attenuation ◽  
Influence Factors ◽  
Propagation Path

Acoustic wave can cause particle vibration in the process of transmission and the energy consumption gradually, and the acoustic wave amplitude will attenuation. Through analysising the propagation path of acoustic wave in the layer media in the process of well cementation., according to the theory of acoustic wave attenuation, the model for calculating the relative acoustical amplitude of well cementation on interfaceⅠ. And on this basis, to discuss the influence factors of relative acoustic on interfaceⅠ

scholarly journals Influences on amplitude estimation using three-parameter sine fitting algorithm in the velocity mode of the Planck-Balance

ACTA IMEKO ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 40
Author(s):  
Shan Lin ◽  
Christian Rothleitner ◽  
Norbert Rogge ◽  
Thomas Fröhlich
Keyword(s):  
Gaussian White Noise ◽  
Harmonic Distortion ◽  
Frequency Error ◽  
Induced Voltage ◽  
Force Factor ◽  
Time Jitter ◽  
Amplitude Estimation ◽  
Additive Gaussian White Noise ◽  
Fitting Algorithm ◽  
Velocity Mode

The Planck-Balance is a table-top version of a Kibble balance. In contrast to many other Kibble balances, the coil is moved sinusoidally and an ac rather than a dc signal is generated in the velocity mode. The three-parameter sine fitting algorithm is applied to estimate the amplitudes of the induced voltage and the coil motion, which are used to determine the force factor Bl of the voice coil of the electromagnetic force compensation balance. However, the three-parameter sine fitting algorithm is not robust against some perturbations, e.g. additive Gaussian white noise, quantization error, harmonic distortion, frequency error and time jitter. These effects have influences on the accuracy of the amplitude estimation. Based on numerical simulations and correlation analyses, the effects of these perturbations are determined. By optimizing measurement and data processing approach, the bias and standard deviation of the estimated amplitude can be effectively reduced, and thus the accuracy of the force factor Bl in the velocity mode can be improved.

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