Research On Analysis Method Of Damping Prediction And Vibration Response For Composite Components With Laminated Structure

With the increasing performance requirements of Aero-Engine, some new structures such asblisk, whole leaf ring, hollow blades as well as turn turbines,etc are beginning to used.However,the advanced composite materials which has the performances of high specific strength,low density, high damping, long life and high temperature capability has been put a high value. Itis beneficial for improving the structural performance, reducing the weight factor of the aircraftstructure and improving the efficiency of the aircraft carrier.Fristly, this paper established the macro-meso analysis models of composite laminates topredictive its damping. The microscopic model has been sued to analyze the elasticity modulusand the loss factors. On the basis of macro-model study, the variation of specific dampingcoefficient of the composite laminates was studied. The effective stiffness matrix and effectivedamping matrix for the multi-layerlaminates has been derived.Secondly, the element stiffness matrix, mass matrix and damping matrix for differentdisplacement patterns and element type has been derived using the finite element method.Through MATLAB software programming, the overall stiffness, mass and damping matrix of thelaminates model was got. Based on the principle of virtual displacement, vibration equation ofcomposte laminats was been established. Then through the Newmark-β numerical integrationmethod, several different structural laminates vibration response under harmonic excitation andpulsed excitation conditions has been analyzed, which was affected by the variation of ply angle,thickness and damping han been studied.Thridly, under the clamped boundary conditions, The modal tests was implemented forspecimens to get the curves of frequency response functions. In the steady-sinusoidal responsetests, the specimens are excited by an exciter. By imposing exciting forces of different amplitudesand frequencies, the responses of the laminated specimens are obtained by the accelerometer. Theeffect of force amplitudes on acceleration amplitudes and resonant frequencies was analyzed.The work on damping characteristics and vibration response of composite laminates isimportent to the materials performance and stuctures optimization. The damping mechanisms anddamping characteristics can be explained through the Meso-macro forecasting model form thelaminates microscopic level. It has more profound understanding and application for the vibrationresponse and optimization of composite materials structural.