Table 1: Variable sensitivity results.

Design variableInitial value (mm)Mass sensitivity ( )Bending displacement sensitivity ( )Equivalent stress sensitivity ( )Modal strain energy sensitivity ( )Inherent frequency sensitivity ( )

5 0.114 0.169
5 0.110
5 0.226
6
6 0.127
7 0.158
180
90 0.106 0.155
150 0.109 0.231
75