Abstract
Studying the changes of the natural frequencies due to intermediate elastic support of laminated composites is usually need a lot of computational processes or difficult to estimate. The present study employs a new high performance method for natural frequency estimating in basalt fiber reinforced polymer (FRP) laminated, variable thickness plates with intermediate elastic support based on the finite strip transition matrix (FSTM) with response surfaces (RS) method. Author has found that the FSTM method is very effective. However, a large error of estimation remains for estimation of natural frequency due to the large number of an iteration implemented in FSTM algorithm to estimate the natural frequency. In the present study, a new data processing procedure is proposed to improve performance of estimations of natural frequency. The estimation responses for four of classical boundary conditions at the plate ends with different elastic restraint coefficients (KT) are computed to obtain the first six frequency parameters (Ω). As a result, the method reveals excellent performance of estimations of natural frequencies.
Highlights
The classical and non-classical plates (i.e. Continuous and with intermediate stiffeners plates) are most common in a wide range of engineering fields such as aerospace, structures, vehicles and marine industries
Author has already applied a predictive model for natural frequency in terms of fiber orientations is developed using artificial neural networks (ANNs) to improve the estimations performance of Finite strip transition matrix (FSTM) by decreasing the effort to obtain frequency parameters in order to treatment the main drawback of the FSTM method [16]
The method has successfully estimation of the natural frequency (Ω) in one step of computing using the FSTM output of standard eigenvalue, in order to eliminate the iteration that implemented in FSTM algorithm to compute the natural frequency and decrease the error of estimation
Summary
The classical and non-classical plates (i.e. Continuous and with intermediate stiffeners plates) are most common in a wide range of engineering fields such as aerospace, structures, vehicles and marine industries. The author has investigated applicability of the FSTM method through a semi-analytical; natural frequency was estimated for basalt FRP laminated, variable thickness plates [15] and with intermediate elastic support. An ANNs model is shown to be very effective for predicting the natural frequency of basalt FRP laminated, variable thickness plates with intermediate elastic support. HIGH PERFORMANCE ESTIMATIONS OF NATURAL FREQUENCY OF BASALT FRP LAMINATED PLATES WITH INTERMEDIATE ELASTIC SUPPORT USING RESPONSE SURFACES METHOD. ALTABEY an improvement to obtain higher estimation performance is proposed for the FSTM method before making response surfaces This new method is applied to estimate natural frequencies of plate type under four different ends of the plate; performance of the new estimation method is evaluated analytically
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