Article

Earthquake Engineering and Engineering Vibration

, Volume 10, Issue 2, pp 219-227

Extraction of real modes and physical matrices from modal testing

  • Tong WangAffiliated withMOE Key Lab of Structural Mechanics and Control for Aircraft, Nanjing University of Aeronautics and AstronauticsInstitute of Vibration Engineering, Nanjing University of Aeronautics and Astronautics Email author 
  • , Lingmi ZhangAffiliated withMOE Key Lab of Structural Mechanics and Control for Aircraft, Nanjing University of Aeronautics and Astronautics
  • , Kong Fah TeeAffiliated withDepartment of Civil Engineering, University of Greenwich

Rent the article at a discount

Rent now

* Final gross prices may vary according to local VAT.

Get Access

Abstract

A technique to extract real modes from the identified complex modes is presented in this paper, which enables the normalized real mode shapes, modal masses, and full or reduced mass and stiffness matrices to be obtained. The theoretical derivation of the method is provided in detail. An 11-DOF vibration system is used to validate the algorithm, and to analyze the effects of the number of modes utilized and measurement DOFs on the extraction results. Finally, the method is used to extract real modes from both experimental modal analysis and operational modal analysis.

Keywords

modal analysis complex mode real mode normalized mode shape modal mass