What is the usefulness of modal analysis?

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Mode shapes tell us how the structure tends to deform at the specific natural frequencies. Mode shapes tell us which regions would experience high stresses if the deformed shape is similar to the mode shape. This is useful because we generally do not want the weld regions to be the region of high stress as it can affect the fatigue life of the structure. Further, the mode participation factor tell us which modes would be excited the most.

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