Besides, a different structural mes

Besides, a different structural mesh density has been performed to examine the variation possibility of natural frequency. Primary prediction assumes that no frequency variation will be expected as the mesh density does not con- tribute to the mass and stiffness of the system. The first-order element type is selected as it is computationally economic and gives accurate result in frequency analysis. This is a common practice and in line with the finite element method (FEM) recommended by Nitin [6]. Table 2 shows the natural frequencies of the suction tube assy under full boundary constraint, two different mesh densities and shell element types.