Maximization of fundamental frequencies of axially compressed laminated truncated conical shells against fiber orientation

A numerical investigation on vibration analysis of fiber reinforced and truncated conical hollow shells with different fiber orientations

“…Table 2 shows the results of vibration mode frequencies for modelled conical shell structures at boundary condition of C-F, and their variations by means of fiber orientation angle was illustrated in Figure 4. It is concluded that frequency values increases with respect to vibration modes indicating a 12 % improvement, while a little variation has been observed as increasing fiber angle resulting in 0.04 % enhancement at fiber angle of [-75/15 This small changes of natural frequencies with respect to fiber orientation angle was attributed the size of the conical shell, implying that long size of the conical shell results in higher deviation of natural frequency changes with respect to fiber orientation angles (Hu and Chen, 2015;Viswanathan et al 2015) A numerical investigation on vibration analysis of fiber reinforced and truncated conical hollow shells with different fiber orientations Table 3 illustrates the mode shapes associated with natural frequencies of conical shell at C-F boundary condition. It is concluded from Table 3 that location and magnitude of maximum deformation have been changed according to mode number and fiber orientation angle significantly affect the safety and stability of the conical system (Dey and Karmakar, 2012) Table 3 illustrates the mode shapes associated with natural frequencies of conical shell at C-F boundary condition.…”

“…When increasing mode number from 1 to 5, maximum enhancement in natural frequency was found 22.28 Hz at fiber angle of [-45/45]. This small changes of natural frequencies with respect to fiber orientation angle was attributed the size of the conical shell, implying that long size of the conical shell results in higher deviation of natural frequency changes with respect to fiber orientation angles (Hu and Chen, 2015;Viswanathan et al 2015) A numerical investigation on vibration analysis of fiber reinforced and truncated conical hollow shells with different fiber orientations according to mode number and fiber orientation angle significantly affect the safety and stability of the conical system (Dey and Karmakar, 2012) Table 3 illustrates the mode shapes associated with natural frequencies of conical shell at C-F boundary condition. It is concluded from Table 3 that location and magnitude of maximum deformation have been changed according to mode number and fiber orientation angle significantly affect the safety and stability of the conical system (Dey and Karmakar, 2012)…”

“…On other hand, dynamic moving load and moving mass problems in the truncated conical shells are essential for engineering problems to predict their vibration problems (Malekzadeh P. and Daraie M., 2014). Hu and Chen (2015) studied free vibration analysis of laminated truncated conical shells subjected to axial compressive forces by using Abaqus FEA. The parameters of the boundary conditions, length of the shell, radius ratio of the shell, and the compressive load on the maximum natural frequency of first mode associated with optimal fiber orientation angle with their mode shapes were studied.…”