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Fundamental frequency determination can help us to find where the resonance will happen. The need of dynamics characteristic is one of the major concerns to find the natural frequency. This paper aims to find the natural frequency of a laminated composite plate and optimizing the plate to get maximum frequency. Finding the optimum design by experimentally are more expensive. To avoid the complications now a days the researchers are using computational method. The present work offering an approach to design optimization of a composite plate with FEA tool and to achieve different combinations of objective using Design of Experiment (DOE) and the maximization of the fundamental natural frequency by using ANSYS Design explorer.

This paper illustrates the application of full-spectrum technique for model-based identification of the crack and unbalance multi-fault parameters in cracked rotor systems. The rotor model chosen is a Laval rotor with disc unbalance and transverse surface crack. The crack force model is a switching crack, which has harmonic components exciting the rotor both in the same and reverse directions of the rotor spin. Development of identification algorithm uses linearized equations of motion in frequency domain. Full-spectrum obtains the complex Fourier coefficients of the force as well as the response. Further usage of these coefficients in the identification algorithm estimates the viscous damping, disc eccentricity, and additive crack stiffness as fault parameters. The accuracy of estimates increases on considering measurements at multiple spin speeds. The algorithm tests reasonably robust for various levels of measurement noise and bias errors in system parameters.Copyright © 2013 by ASME