A NEW COMPLEX EXPONENTIAL FREQUENCY DOMAIN TECHNIQUE FOR ANALYZING DYNAMIC RESPONSE DATA

摘要

Accurate measurements of the dynamic characteristics of structures and materials are becoming increasingly important in modern analysis and design procedures. A crucial factor in the use of such measurements is the ability to obtain important physical parameters such as natural frequencies, damping values, etc. directly from the dynamic test data. Recently, two new methods, called Ibrahim's Time Domain (ITD) Modal Identification Algorithm and the Single-Station Time-Domain (SSTD) Vibration Testing Technique, have proven to be particularly successful in extracting the natural frequencies and associated damping ratios from the free vibration time response of a structure. This paper describes the development of a frequency-domain version of these methods, which may have certain advantages with respect to sampling and filtering over the time-domain algorithms, and its use for a simple system.