Title of article :
Potential of Global Positioning System (GPS) to measure frequencies of oscillations of engineering structures
Author/Authors :
Psimoulis، نويسنده , , Panos and Pytharouli، نويسنده , , Stella and Karambalis، نويسنده , , Dimitris and Stiros، نويسنده , , Stathis، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
Pages :
18
From page :
606
To page :
623
Abstract :
Global Positioning System (GPS) has been successfully used to measure displacements of oscillating flexible civil engineering structures such as long suspension bridges and high-rise buildings, and to derive their modal frequencies, usually up to 1 Hz, but there is evidence that these limits can be exceeded using high frequency GPS receivers. Based on systematic experiments in computer controlled oscillations with one- and three-degrees of freedom we investigated the potential of GPS, first to record higher oscillation frequencies, at least up to 4 Hz at the minimum resolution level of this instrument for kinematic applications (⩾5 mm), and second, to identify more than one dominant frequency. Data were processed using least squares-based spectral analysis and wavelet techniques which permit to analyze entire time series, even those of too short duration or those characterized by gaps, in both the frequency and the time domain. ility of GPS to accurately measure frequencies of oscillations of relatively rigid (modal frequencies 1–4 Hz) civil engineering structures is demonstrated in the cases of two bridges. tcome of this study is that GPS is suitable for the identification of dynamic characteristics of even relatively rigid (modal frequencies up to 4 Hz) civil engineering structures excited by various loads (wind, traffic, earthquakes, etc.) if displacements are above the uncertainty level of the method (⩾5 mm). Structural health monitoring of a wide range of structures appears therefore a promising field of application of GPS.
Journal title :
Journal of Sound and Vibration
Serial Year :
2008
Journal title :
Journal of Sound and Vibration
Record number :
1398849
Link To Document :
بازگشت