ms

$]\}$

$0\mathrm{.}9673$

$\{[1\mathrm{.}4510]\}$

$-0\mathrm{.}7454$

$\{[1\mathrm{.}4907]\}$

$0\mathrm{.}8550$

$\{[-0\mathrm{.}3420$

Figure P$11\mathrm{.}1$

$11\mathrm{.}2$ For the system of Fig. P$11\mathrm{.}1,$ use Caughey series to determine the classical damping matrix if the damping ratio is $5\%$ for all three modes.