| http://www.w3.org/ns/prov#value | - In an embodiment of the present invention, the damping ratio ?? is controlled as shown in FIG. 5, wherein the lowest value is obtained in a range of a non-dimensional frequency P of between 0 to 0.8, and the maximum value is obtained in a range of the non-dimensional; frequency between 0.8 to 1.4.
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