TECHNIQUES FOR FORCED RESPONSE INVOLVING DISCRETE NONLINEARITIES - PART II: APPLICATIONS

摘要

Generally, response analysis of systems containing discrete nonlinear connection elements such as typical mounting connections require the physical finite element system matrices to be used in a direct integration algorithm to form the nonlinear response analysis solution. Due to the large size of these physical matrices, forced nonlinear response analysis requires significant computational resources. Usually, the individual components of the system are analyzed and tested as separate components and their individual behavior may essentially be linear when compared to the total assembled system. However, the joining of these linear subsystems using highly nonlinear connection elements causes the entire system to become nonlinear. It would be advantageous if these linear modal subsystems could be utilized in the forced nonlinear response analysis since much effort has usually been expended in fine tuning and adjusting the component analytical models to reflect the tested subsystem configuration. Several more efficient techniques have been developed to address this class of problem. Three techniques are presented in this paper and are compared to traditional methods. These techniques are Equivalent Reduced Model Technique (ERMT); Modal Modification Response Technique (MMRT); Component Element Method (CEM). The general theory of these techniques is presented in Part I of this paper. Application of these techniques is presented in Part II of this paper.