The modal parameters are the basic data for structure dynamic analysis and vibration control . the methods of modal parameters identification can be cataloged into phase resonance testing ( normal - mode force appropriation ) and phase separation approaches
2.
In contrast to phase separation ( curve - fitting ) approaches which are largely mathematical , phase resonance testing is a physical technique . when a structure is vibrating in a normal mode , the undamped natural frequency and normal - mode shap of the structure are directly measured . in the classic phase resonance testing , the test data processing is simpler and the results are more accuracy
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