Accurate and efficient identification of cable natural frequencies for cable tension monitoring by vibration frequency method

Lin Liu; Weimin Chen; Peng Zhang; Shunren Hu; Wei Luo

doi:10.1117/12.905347

15 November 2011 Accurate and efficient identification of cable natural frequencies for cable tension monitoring by vibration frequency method

Lin Liu, Weimin Chen, Peng Zhang, Shunren Hu, Wei Luo

Author Affiliations +

Proceedings Volume 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation; 83213M (2011) https://doi.org/10.1117/12.905347
Event: Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 2011, Yunnan, China

Abstract

Vibration frequency method is widely used to measure cable tension of cable-stayed bridges at present. Accurate and efficient identification of cable natural frequencies is one of critical factors in cable tension monitoring. However, it is difficult to efficiently identify accurate natural frequencies in practice. Based on the theory of vibration frequency method, this paper first gives an analysis on how the data sampling parameters affect the accuracy of natural frequencies identification, so as to propose an optimization method of setting sampling parameters. Then, according to the vibration mode of a cable, a new approach, spectrum multiplication, is put forward to help to efficiently identify these frequencies by improving SNR of the vibration spectrum. Field experiments of cable tension monitoring are done at a cable-stayed bridge. The results indicate that measurement accuracy and efficiency are both improved with the optimized sampling parameters and the spectrum multiplication.

Citation Download Citation

Lin Liu, Weimin Chen, Peng Zhang, Shunren Hu, and Wei Luo "Accurate and efficient identification of cable natural frequencies for cable tension monitoring by vibration frequency method", Proc. SPIE 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 83213M (15 November 2011); https://doi.org/10.1117/12.905347

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