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Why is the damping ratio set to 0.004 in Example 5?

2018-08-16View Original

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In the interpretation of standard 47041, why is the empty tower damping ratio set at 0.004 in Example 5, when the specified range in the standard is 0.01–0.03? The calculation of this damping ratio is hardly done; it is mostly based on literature, and the given range is also a standard specification. I would like to ask how this damping ratio should be chosen?

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