The improper setting of data sampling parameters will greatly reduce the measurement precision of cable tension using frequency method, because it is not propitious for the identification of fundamental frequency.On the basis of the analysis on the effects of data sampling parameters, i. e. sampling frequency and amount of sampling data,on the identification precision of fundamental frequency,and according to Nyquist law, an optimal matching method of setting data sampling parameters is put forward to improve the measurement precision, which has considered real-time measurement and limited storage capacity at the same time. The testing results of Masangxi Changjiang River Bridge prove that the measurement precision is improved by at least 2 times with this method, which has good application value in engineering.%利用振频法进行索力测量,数据采样参数设置不当会大大降低基频识别精度进而降低索力测量精度.在分析采样参数即采样率和采样数对基频识别精度影响的基础上,根据奈奎斯特定律,兼顾测昔实时性和有限的数据存储空间,提出最优化数据采样参数匹配方法,以提高测量精度.对马桑溪长江大桥斜拉索索力进行现场测试,结果表明:按照最优的参数匹配方法进行合理的参数设置,索力测量精度至少提高2倍,具有较好的工程应用价值.
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