Combined Iteration Method of Load Identification for A Complex Structure with Nonlinearity

摘要

A combined iteration method of load identification method is presented concerning one type of structure with nonlinearity. The proposed method realizes the load identification of the nonlinear dynamical system by combining and iterating the finite element method and the active control method. The finite element models of nonlinear dynamical systems are firstly contracted into the simplified model to make up the controlled plant. Then under the selected control law, the controller is designed to produce the system excitation, namely the identified load. The validity of the load is finally checked through the response of the nonlinear finite element model. For a conical shell-belting combined system, the numerical study regarding the load identification demonstrates the validity of combined iteration method, which can plays a guiding role in the load identification of vibration test respecting aerospace structures, such as missile, aerospacecraft, aerospaceplane, rocket and so on, making great contribution to the development of the aerospace industry.