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  • Muller  (3)
  • Acoustics  (2)
  • BTI  (1)
  • Crustal deformation (cf. Earthquake precursor: deformation or strain)  (1)
  • 34.50.Fa
  • 2000-2004  (5)
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  • 1
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    Contemporary tectonic stress: advances in research and industry (2000)
    In:  Eos, Trans., Am. Geophys. Un., Warszawa, American Geophysical Union, vol. 81, no. 13, pp. 137 & 140, pp. L08304, (ISSN: 1340-4202)
    Details
    Publication Date: 2000
    Keywords: Stress ; Proceedings of a conference ; Stress measurements ; Borehole breakouts ; BTI ; cracks and fractures (.NE. fracturing) ; Geodesy ; Global Positioning System ; Very Long Baseline Interferometry ; Strain ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Applied geophysics ; Muller ; World Stress Map (Project) ; Euroconferences
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    The tectonic regime in Italy inferred from borehole breakout data (2003)
    In:  Tectonophysics, Kunming, China, 3-4, vol. 361, no. 1-2, pp. 21-35, pp. 2276, (ISSN: 1340-4202)
    Details
    Publication Date: 2003
    Keywords: Stress ; Borehole geophys. ; Borehole breakouts ; Mueller ; Muller
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Stress maps in a minute: the 2004 World Stress Map release (2004)
    In:  Eos, Trans., Am. Geophys. Un., Oxford and Edinburgh, Blackwell Scientific Publications, vol. 85, no. 49, pp. 521 & 529, pp. 1484, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 2004
    Keywords: Stress ; software ; Plate tectonics ; Tectonics ; Earthquake hazard ; data ; base ; Fault plane solution, focal mechanism ; Borehole breakouts ; quality ; World Stress Map (Project) ; Muller ; Mueller
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    High Order Difference Method for Low Mach Number Aeroacoustics (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: A high order finite difference method with improved accuracy and stability properties for computational aeroacoustics (CAA) at low Mach numbers is proposed. The Euler equations are split into a conservative and a symmetric non- conservative portion to allow the derivation of a generalized energy estimate. Since the symmetrization is based on entropy variables, that splitting of the flux derivatives is referred to as entropy splitting. Its discretization by high order central differences was found to need less numerical dissipation than conventional conservative schemes. Owing to the large disparity of acoustic and stagnation quantities in low Mach number aeroacoustics, the split Euler equations are formulated in perturbation form. The unknowns are the small changes of the conservative variables with respect to their large stagnation values. All nonlinearities and the conservation form of the conservative portion of the split flux derivatives can be retained, while cancellation errors are avoided with its discretization opposed to the conventional conservative form. The finite difference method is third-order accurate at the boundary and the conventional central sixth-order accurate stencil in the interior. The difference operator satisfies the summation by parts property analogous to the integration by parts in the continuous energy estimate. Thus, strict stability of the difference method follows automatically. Spurious high frequency oscillations are suppressed by a characteristic-based filter similar to but without limiter. The time derivative is approximated by a 4-stage low-storage second-order explicit Runge-Kutta method. The method has been applied to simulate vortex sound at low Mach numbers. We consider the Kirchhoff vortex, which is an elliptical patch of constant vorticity rotating with constant angular frequency in irrotational flow. The acoustic pressure generated by the Kirchhoff vortex is governed by the 2D Helmholtz equation, which can be solved analytically using separation of variables.
    Keywords: Acoustics
    Type: European Congress on Computational Methods in Applied Sciences and Engineering; Sep 04, 2001 - Sep 07, 2001; Swansea; United Kingdom
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Sound Emission of Rotor Induced Deformations of Generator Casings (2001)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The casing of large electrical generators can be deformed slightly by the rotor's magnetic field. The sound emission produced by these periodic deformations, which could possibly exceed guaranteed noise emission limits, is analysed analytically and numerically. From the deformation of the casing, the normal velocity of the generator's surface is computed. Taking into account the corresponding symmetry, an analytical solution for the acoustic pressure outside the generator is round in terms of the Hankel function of second order. The normal velocity or the generator surface provides the required boundary condition for the acoustic pressure and determines the magnitude of pressure oscillations. For the numerical simulation, the nonlinear 2D Euler equations are formulated In a perturbation form for low Mach number Computational Aeroacoustics (CAA). The spatial derivatives are discretized by the classical sixth-order central interior scheme and a third-order boundary scheme. Spurious high frequency oscillations are damped by a characteristic-based artificial compression method (ACM) filter. The time derivatives are approximated by the classical 4th-order Runge-Kutta method. The numerical results are In excellent agreement with the analytical solution.
    Keywords: Acoustics
    Type: AIAA Paper 2001-2274 , 7th AIAA/CEAS Aeroacoustics Conference; May 28, 2001 - May 30, 2001; Maastricht; Netherlands
    Format: application/pdf
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