Bias error analysis for phase and amplitude gradient estimation of acoustic intensity and specific acoustic impedance

2017 ◽  
Vol 142 (4) ◽  
pp. 2208-2218 ◽  
Author(s):  
Eric B. Whiting ◽  
Joseph S. Lawrence ◽  
Kent L. Gee ◽  
Tracianne B. Neilsen ◽  
Scott D. Sommerfeldt
Keyword(s):  
Error Analysis ◽  
Acoustic Impedance ◽  
Bias Error ◽  
Gradient Estimation ◽  
Acoustic Intensity

Bias error comparison for plane-wave acoustic intensity using cross-spectral and phase-and-amplitude-gradient-estimator methods

2017 ◽  
Vol 141 (5) ◽  
pp. 3586-3586
Author(s):  
Daxton Hawks ◽  
Tracianne B. Neilsen ◽  
Kent L. Gee ◽  
Scott D. Sommerfeldt
Keyword(s):  
Plane Wave ◽  
Bias Error ◽  
Acoustic Intensity

scholarly journals Three-microphone probe bias errors for acoustic intensity and specific acoustic impedance

2018 ◽  
Vol 143 (2) ◽  
pp. EL81-EL86 ◽  
Author(s):  
Joseph S. Lawrence ◽  
Eric B. Whiting ◽  
Kent L. Gee ◽  
Reese D. Rasband ◽  
Tracianne B. Neilsen ◽  
...  
Keyword(s):  
Acoustic Impedance ◽  
Acoustic Intensity

Extension of the phase and amplitude gradient estimation method for acoustic intensity to narrowband sources

2017 ◽  
Vol 141 (5) ◽  
pp. 3796-3796
Author(s):  
Kelli Succo ◽  
Scott D. Sommerfeldt ◽  
Kent L. Gee ◽  
Tracianne B. Neilsen
Keyword(s):  
Estimation Method ◽  
Gradient Estimation ◽  
Acoustic Intensity

Acoustic Intensity and Specific Acoustic Impedance

2021 ◽  
pp. 81-116
Author(s):  
Hejie Lin ◽  
Turgay Bengisu ◽  
Zissimos P. Mourelatos
Keyword(s):  
Acoustic Impedance ◽  
Acoustic Intensity

scholarly journals Non-Negative Intensity for Structures with Inhomogeneous Damping

2019 ◽  
Vol 27 (01) ◽  
pp. 1850050 ◽  
Author(s):  
Daipei Liu ◽  
Steffen Marburg ◽  
Christian Geweth ◽  
Nicole Kessissoglou
Keyword(s):  
Cylindrical Shell ◽  
Acoustic Impedance ◽  
Acoustic Pressure ◽  
Sound Radiation ◽  
Far Field ◽  
Impedance Matrix ◽  
Acoustic Intensity ◽  
Rayleigh Damping ◽  
Surface Areas ◽  
Structural Surface

In this work, numerical methods to identify the surface areas of a vibrating structure that radiate sound are implemented for cases of structures with inhomogeneous distributions of viscous Rayleigh damping. The intensity-based techniques correspond to acoustic intensity evaluated in terms of the acoustic pressure and particle velocity, non-negative intensity evaluated in terms of the acoustic impedance matrix obtained at the structural surface, and back-calculated non-negative intensity evaluated in terms of the acoustic impedance matrix obtained at a far-field receiver surface. Different configurations of inhomogeneous damping are applied to two elastic structures corresponding to a plate and a cylindrical shell. To examine the influence of inhomogeneous damping on sound radiation, the acoustic intensity on the structural surface, the acoustic intensity on several different far-field receiver surfaces, non-negative intensity and back-calculated non-negative intensity are numerically compared for different inhomogeneous damping cases.

The O–C diagrams of minor planets − a new approach to modelling the rotation

1999 ◽  
Vol 173 ◽  
pp. 185-188
Author(s):  
Gy. Szabó ◽  
K. Sárneczky ◽  
L.L. Kiss
Keyword(s):  
Error Analysis ◽  
Time Dependence ◽  
Theoretical Work ◽  
Minor Planet ◽  
Minor Planets ◽  
New Approach ◽  
Preliminary Results ◽  
Ccd Observations

AbstractA widely used tool in studying quasi-monoperiodic processes is the O–C diagram. This paper deals with the application of this diagram in minor planet studies. The main difference between our approach and the classical O–C diagram is that we transform the epoch (=time) dependence into the geocentric longitude domain. We outline a rotation modelling using this modified O–C and illustrate the abilities with detailed error analysis. The primary assumption, that the monotonity and the shape of this diagram is (almost) independent of the geometry of the asteroids is discussed and tested. The monotonity enables an unambiguous distinction between the prograde and retrograde rotation, thus the four-fold (or in some cases the two-fold) ambiguities can be avoided. This turned out to be the main advantage of the O–C examination. As an extension to the theoretical work, we present some preliminary results on 1727 Mette based on new CCD observations.

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