Modal Analysis Using Motion Magnification Methods

Figure 4: Still image from the animation of the impeller with the laser vibrometer measuring blade 1, and at a frequency of 2175 Hz. This mode shape showed adjacent blades to blade 1 moving in phase with each other.

Figure 5: Still image from the animation of the impeller with the laser vibrometer measuring blade 2, and at a frequency of 2170 Hz. This mode shape showed that blade 2 moved out of phase with all other adjacent blades.

Figure 6: Still image from the animation of the impeller with the laser vibrometer measuring blade 4, and at a frequency of 2230 Hz. This mode shape showed that blade 4 was moving with very little, to no participation from the other blades.

Figure 7: The MMV modal process applied to a vertical turbine pump and motor, determining “reed” natural frequency and mode shape perpendicular to discharge head at 7.5 Hz

Figure 8: The EMA MMV modal process applied to a vertical turbine pump and motor, determining “reed” natural frequency and mode shape parallel to the discharge head at 7.8 Hz

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