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签到天数: 29 天 连续签到: 8 天 [LV.4]偶尔看看III
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发表于 2022-1-31 17:45
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本帖最后由 zengxiaodong 于 2022-1-31 17:51 编辑
Multiple frequency order lines are possible for a given order “n”, e.g. (m = 4, n) and (m=8, n). The Plot Selection dropdown allows to track frequency order lines considering either all wavenumbers or a particular wavenumber. By hovering the mouse cursor on an excitation order line, the space and frequency orders along with the speed and frequency data are displayed in the status line. Operating points at which force harmonics are calculated are defined in the Calculation tab. Harmonic force data are then interpolated between simulated speed points.
The dark blue regions correspond to either regions of null excitation in between two consecutive frequency order lines, or regions where the excitation is simply not calculated, as per the Nyquist-Shannon Theorem. Dashed lines represent the natural frequencies of the stator structural modes, calculated from the Modal analysis.
The Campbell Diagram represents the force excitation frequencies of the stator against various operating speeds. Each frequency/space orders colour is displayed relative to it's maximum amplitude across each load point. Dashed vertical lines represent the natural frequencies calculated from the Modal model up to the maximum plotted excitation frequency. See NVH settings for more information on the maximum plotted excitation frequency.
This plot is extremely useful to not only extract the main excitation orders but also evaluate their potential interaction with the stator structure (see Resonance Effect for more information).
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