Change in modal parameters due to the mass of transducers in modal testing is a well-known problem. Modal analysis methods in frequency domain are based on a set of measured frequency response functions (FRF). This paper reveals the relationship between the measured FRFs with extraneous mass of transducers and the accurate FRFs with no extraneous mass when multi-transducers are mounted on the structure simultaneously. A correction technique of the mass-loading effects of multi-transducers is proposed. Digital simulations show that the methods of mass cancellation to FRF proposed in this paper can reach good results near resonance frequencies.
ABSTRACT<BR>1. Introduction<BR>2. Theory of Mass Cancellation of Transducer in Modal Testing<BR>3. Digital Simulation<BR>4. Conclusion<BR>References<BR>
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