Abstract: In the course of tesing technology on-line , owing to the frequency error , especially due to the curve rigidity effect , the calculated tension of cables has some errors .This paper introduces the method for correcting the tension of cables by using the principles of Least squares , and it also analyses its accuracy .The results verify that the modificatory technology of the natural frequency is right ;the tension of cables accuacy is better and the cables are safe

Key words: principles of Least squares , tension , frequency , accuracy evaluation

摘要： 在动态测试技术中，由于频率观测误差特别是弯曲刚度的影响，使得计算的扣索张力有误差。文章介绍了 运用最小二乘原理修正频率并对扣索张力精度进行估计。结果表明:频率修正正确，索力精度高，保证了吊装过 程扣索的安全。

关键词: 最小二乘原理, 张力, 固有频率, 精度估计