Experimental Modal Analysis and Dynamic Component Synthesis. Volume 2. Measurement Techniques for Experimental Modal Analysis

摘要

When attempting to experimentally determine the dynamic properties (natural frequency, damping, and mode shapes) of a structure, one of the most important aspects is to collect and process data that represents the structure as accurately as possible. This means that 'clean' and error free data must be collected. This data must be processed by an appropriate frequency response function model. This data can then be used as input to an number of parameter estimation algorithms and could also be used in modal modeling algorithms. This technical report describes the procedure used to collect this data. Many of the potential errors are discussed as well as techniques to eliminate or reduce the effects of these errors on the quality of the results. Throughout the time frame of this contract, it was determined, that if the procedures described in this technical report are followed, data can be collected, as input to modal parameter estimation algorithms, that will yield accurate dynamic properties of the test structure. With care and attention to theoretical limitations, these dynamics properties can be used to construct a modal model.