Structural dynamics modeling using modal analysis: applications, trends and challenges

System identification plays a crucial role in structural dynamics and vibro-acoustic system optimization. The followed approach is based on the "Modal Analysis" concept. The Eigenmodes of the system model can be visualized and allow a direct physical interpretation. Using the modal models, design improvements can be predicted and the structure optimized. The present paper not only reviews the test procedure and system identification principles of modal analysis, but also discusses the main practical problems with which engineers, performing modal analysis on industrial structures, are confronted on a daily basis. New trends in modal analysis that specifically address these problems are reviewed and illustrated with case studies. This includes the issues of instrumentation, test definition, measurement principles, and parameter estimation.