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At first, the initial shape imperfections are modeled using the buckling mode shapes resulting from an eigenvalue buckling analysis.
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Table 7 Mode shape results of Mode I from ambient signals with different SNR values SNR (dB) Gen Magnitude (p.u).
And the identified mode shape results of Mode I from ambient data with 20-dB signal-to-noise ratio (SNR) and 12-dB SNR are indicated in Table 7.
Table 6 Mode shape results of Mode I in 36-node benchmark system Gen Magnitude (p.u).
Exact natural frequencies and Jacobi polynomials as exact mode shapes, which result directly from eigenvalues and eigenfunctions of eigenvalue singular problems of classical orthogonal polynomials, are reported for these classes.
Deformation modes resulting from the 3D experiments.
By comparing the calculated natural frequencies and the mode shapes with the results obtained from experimental modal testing, the effects of the teeth of the stator, windings, outer casing, slots, end-shields and support on the overall vibration behaviour are analyzed.
Open image in new window Fig. 13 Mode shapes as obtained from the updated FE simulation results Table 3 Comparison between ambient vibration test and UFEM results Mode Description Freq.
Modal analysis was performed to obtain the mode shapes from both experimental and finite element analysis results.
This is achieved by using mode shapes extracted from the beam theory as generating functions.
Then the natural frequencies and mode shapes follow from the application of the Wittrick Williams algorithm.
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