3/21/2024 0 Comments Airfoil diagramIts first flexural natural frequency is calculated and found to be 200 Hz. For example, take the second-stage blade of a hypothetical compressor. This form of design study is necessary, especially when designing an axial compressor to determine if a natural blade frequency is excited by a running frequency, its harmonics, or sub-harmonics. The fan lines are engine-order lines: one-half engine order, one times engine order, two times engine order, three times engine order, four times engine order, five times engine order, 10 times engine order, and so on. The system frequency is along the Y axis. Engine rotational speed is along the X axis. A typical Campbell diagram plot is shown in Figure 5-25. The Campbell diagram can be generated from machine design criteria or from machine operating data. The Campbell diagram is an overall or bird's-eye view of regional vibration excitation that can occur on an operating system.
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