Table 8 Eigenfrequencies given in [ Hz ] for the conform and the new method with the corresponding deviation in [%] for the elastomer thickness 4[cm]

1

46.100

46.001

0.215

39.931

40.471

1.354

26.683

27.634

3.562

2

50.780

51.115

0.661

46.091

47.664

3.413

32.869

35.531

8.098

3

59.252

59.736

0.817

47.753

48.835

2.266

35.046

36.449

4.004

4

75.331

76.804

1.956

61.409

65.291

6.323

45.903

48.787

6.283

5

100.661

102.266

1.594

85.356

86.606

1.464

73.943

73.419

0.707

6

132.275

134.570

1.735

93.278

96.202

3.135

78.124

78.372

0.317

7

145.499

148.266

1.902

108.759

115.437

6.140

80.538

84.663

5.122

8

148.833

153.236

2.959

113.584

119.391

5.113

101.426

100.758

0.658