Numerically Simulated Results for a Deterministic Excitation with no External Loads

Abstract

This paper presents a numerical example of the theory presented in Part I [1] where a model is developed to describe the requirements for laboratory simulations of field vibration environments. This example illustrates the application of such a model to simulated data in order to evaluate its accuracy in predicting field interface forces and motions, and in using field data to define appropriate test item inputs in laboratory simulations. It is assumed that no external forces act on the test item in either the field or laboratory environments. All Frequency response functions (FRFs) are calculated for all test structures from a multi degree of freedom (MDOF) discrete linear system. The equations developed in Ref. [1] are employed to estimate field interface forces and test item motions as well as to define test item inputs in the laboratory simulation. The test item motions obtained in all laboratory simulations are compared with the corresponding field motions.