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High stress values outside of natural frequencies

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Hello,

In Optistruct frequency response modal analysis, I am getting very high stress peaks outside of the natural frequencies. For example, I am applying same amount of acceleration from 1 to 100 Hz. According to the modal analysis, system has natural frequencies at 11.4 , 14.0 , 16.7 , 27.08 Hz. But when I investigate stress vs. frequency, I obtain the highest stress values at 22.6 Hz with much higher than the ones at natural frequencies. What can be wrong here?

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Its not necessary that you would get peak stresses based on natural frequencies.Can you please share some more information related to inputs defined?(.fem & .out file)

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