Detection of abrupt changes in modal characteristics of a vibrating structure-a case study

Author

Popescu, Theodor D.

Author_Institution

Res. Inst. for Inf., Bucharest, Romania

Volume

2

fYear

1999

fDate

1999

Firstpage

1442

Abstract

The problem of change detection in the poles of signals having unknown time varying zeroes is addressed. Instead of the test statistics based upon the standard likelihood ratio approach, which is of no help in this case because of the unknown zeroes, there is used a test statistics based on an identification method (instrumental variables), which is known to decouple the AR and MA coefficients of the model. The procedure has been used for change detection in modal characteristics of a single degree of freedom oscillator and of a vibrating structure, a multi-story reinforced concrete building, subject to a strong seismic motion

Keywords

autoregressive moving average processes; monitoring; poles and zeros; structural engineering; vibration measurement; 1-DOF oscillator; AR coefficients; ARMA model; MA coefficients; abrupt change detection; coefficient decoupling; identification method; instrumental variables; modal characteristics; multi-story reinforced concrete building; poles; strong seismic motion; test statistics; unknown time varying zeroes; vibrating structure; Bridges; Buildings; Computer aided software engineering; Concrete; Instruments; Monitoring; Motion detection; Oscillators; Statistical analysis; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Control Applications, 1999. Proceedings of the 1999 IEEE International Conference on

Conference_Location

Kohala Coast, HI

Print_ISBN

0-7803-5446-X

Type

conf

DOI

10.1109/CCA.1999.801184

Filename

801184