STUDY ON TENSION AND FLEXUAL RIGIDITY IDENTIFICATION FOR CABLES HAVING LARGE RATIO OF THE DIAMETER AND THE LENGTH

The extended Kalman filter is applied to the simultanious identification of tension and flexual rigidity of cables which diameters are comparative large with the length. The one degree of freedom model reduced to low order natural frequency mode is used as the mathmatical model of cables. on the extended Kalman filter. The experiments are carried out by using the twisted wire which diameter is 0.0287m and length is 1.990m. Impact hammering and an attached type excitation machine are used as excitation methods. Because the mass of the attached type excitation machine was not able to be disregarded compared with the mass of the cable, the frequency equation of the cable which had the additional mass at an arbitrary position was led, and was introduced into the extended Kalman filter. It was confirmed that the tension and the flexural rigidity of the wire were identified accurately by the experiment in the area where the tension was small.