Table 2: Optimal damping ratio and optimal frequency ratio of substructures.

Programs54324, 53, 52, 53, 4, 52, 4, 52, 3, 4, 5

0.80370.81430.82160.84090.71210.72360.75640.64510.66440.61
0.14900.14380.11110.07780.18810.17470.16230.20400.19330.2700

0.76170.77500.78900.82150.63440.65050.69860.54170.56870.4400
0.17920.14430.12930.09000.21810.20130.18790.23130.21830.300

0.72390.74300.76200.79550.56080.58320.64560.44100.47920.2900
0.19590.14720.14230.10090.23870.21910.20560.24600.23080.300