摘要
采用频率法测定索力的固有频率提取方法,只需要计算斜拉索任意连续两阶固有频率之差,减少了斜拉索抗弯刚度的影响,提高了索力测试精度。单点傅立叶变换(FT)细化方法原理的本质是时间离散和截断、频率连续的特殊傅立叶变换形式;采用连续细化分析傅立叶变换(FFT+FT)校正法测量斜拉索固有频率,大幅度提高了频率分析精度,从而提高了索力测试精度。仿真和实例分析表明,索力测试精度最大可以提高10%以上。
The adopted method of extracting inherent frequency need only calculate the difference of continuous two inherent frequency, it reduces the effect of stiffness on cable-stayed bridge and increases the precision of cable tension measurement; the principle nature of FT is fast fourier transform of discrete and finite time and continuous frequency;picking-up inherent frequency by FFT ＋ FT continuous thining analysis method, which increases frequency analysis precision greatly, and then increases precision of cable tension measurement. Simulation and example analysis confirm that the method can increase 10% precision at most.
出处
《现代制造工程》
CSCD
2008年第5期7-11,共5页
Modern Manufacturing Engineering
基金
国家自然科学基金资助项目(50475095)
关键词
索力测试
固有频率
频谱校正
Cable tension measurement
Inherent frequency
Discrete spectrum correction
