关键词: 复合材料, 振动, 控制问题, 有限元, 智能结构

Abstract: Using first order shear theory, this paper proposes the FEM analysis for self sensing laminate composite plates For reducing the degrees of freedom, this paper employs the method of expansion over the mode shapes Then state equations are given with the modal coordinate being the state variables and the current induced by mechanics is considered as the output variable of the measurement equation Based on the equations, this paper implements the LQG and H _∞ control Numerical simulation of self sensing laminates with four pairs of piezoelectric films bonded on the surface of base structure is given. Singular value curves of system and velocity response caused by applied force are plotted, and external excitation of the vibration system is suppressed effectively The simulation solution illustrates that the control method in this paper is effective

Key words: composite materials, vibr ation, contr ol problem, FEM, smart st ructure