Ei Cj

With Eq. (3.107) one may determine the divergence dynamic pressure with sufficient accuracy to ascertain its trends versus sweep angle A and elastic coupling parameter k. The formula shows that there is a strong relationship between these two quantities.

To illustrate the utility of the above analysis, let us first normalize qi> with the value it would have at zero sweep angle and zero coupling, namely, qD(l, so that

qp qD0

El GJ

The denominator's vanishing corresponds to infinite divergence dynamic pressure, and crossing this "boundary" means crossing from a regime in which divergence exists to one in which it does not. Setting the denominator to zero and solving for the tangent of the sweep angle, one obtains tan(Aoo)

37i2 G J i

76 EI e

0 0

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