|Table of Contents|

Tension Identification Precision Enhancement Method for Stay Cable(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2008年04期
Page:
42-46
Research Field:
Publishing date:
2008-12-20

Info

Title:
Tension Identification Precision Enhancement Method for Stay Cable
Author(s):
LI Feng-chen;  LIU Qing;  WANG Da-peng;  TIAN Shi-zhu
School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China
Keywords:
cable tension measurement;  identification precision;  smooth denoise;  stay cable;  error analysis
PACS:
TU208.5
DOI:
-
Abstract:
Based on the measured signal of stay cable under ambient excitation, the method with five points and three times was put forward to smoothly process the frequency-domain data obtained from fast Fourier transform(FFT)because of the non-stability and non-smoothness resulting from ambient interference. This method was used to enhance the identification precision for stay cable tension by considering some influencing factors. Using the measured signal of stay cable in practical engineering, the method with five points and three times was used to process smooth denoise. By considering the effect of sampling time and sampling numbers on the identification precision for stay cable tension, the method to calculate extreme method was used to determine the frequency and its location of stay cable at various ranks. The precisions of basic frequency method, frequency difference method and peak value method were compared. The error analysis for cable tension measurement was also carried out. The results show that combining with extreme process, the method with five points and three times can well identify the frequency of stay cable at various ranks; different factors have different influences on the identification precision for stay cable frequency. It is possible to identify the stay cable tension more accurately by basic frequency method, and it also provides the efficient proof for the development of cable tension measurement instrument with high precision.

References:

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Last Update: 2008-12-20