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- W2120233168 abstract "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 analyzed 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 found in terms of the Hankel function of second order. The normal velocity of 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." @default.
- W2120233168 created "2016-06-24" @default.
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- W2120233168 date "2001-05-28" @default.
- W2120233168 modified "2023-09-24" @default.
- W2120233168 title "Sound emission of rotor induced deformations of generator casings" @default.
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- W2120233168 doi "https://doi.org/10.2514/6.2001-2274" @default.
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