METHOD FOR MEASURING FLEXURAL RIGIDITY AND TENSION OF TENSIONED CABLE

摘要

PROBLEM TO BE SOLVED: To provide a method by which the flexural rigidity of a cable can be measured easily with high accuracy and the tension of the cable can be calculated without conducting any preliminary experiment in laying the cable even when the length of the cable reaches hundreds of meters. ;SOLUTION: The flexural rigidity 5 of a tensioned cable 1 is found by giving an impact to the cable 1 and detecting 2a the vibration of an arbitrary part of the cable 1, and then, performing frequency analyses 3 and 4 on the detected vibration and finding the rigidity 5 from a plurality of characteristic frequencies existing in a frequency area where the influence of the flexural rigidity become dominant of the analyzed results. Or, the flexural rigidity of the cable 1 is calculated from a plurality of number-of-vibration data by performing frequency analysis for finding a transfer function from the ratio between the vibrations detected at two points on the cable 1 and reading the number of vibrations indicating the maximum or minimum value of an obtained frequency response function and, at the same time, selecting the plurality of number-of-vibration data of an area where the influence of the flexural rigidity becomes dominant.;COPYRIGHT: (C)1997,JPO