摘要
本文介绍了相位修正技术、A/D板随动前置放大技术、及其在大型结构现场动力测试分析中的应用.相位修正技术解决了A/D板因轮换采样的时间差引起的频域相位差问题;而随动前置放大技术则解决了实测过程中各测点信噪比悬殊时带来的问题.这些技术的实现,使得以微机为基础的直接现场采样动力分析成为可能.最后的两个实际现场测试分析例子,证明了上述技术在工程实用中的可行性与可靠性.
In this paper, the techniques of the phase improvement and the dynamic A/D preamplifier are introduced. The former is used to improve the frequency-domain phase-angle difference caused by the time difference induced during the multi-channel taking-turn sampling, whereas the later is used to solve the problem caused by the large disparity of the signal-noise ratios among the different channels during the real testing. The application of the above techniques made it possible to set up a micro-computer-based direct sampling-analysis system for on-the -spot testing of large structure. Finally, two practical on-the-spot tests proved that the micro-computer-based direct sampling-analysis system, after adopting the above techniques, is feasible and practical.
出处
《应用力学学报》
CAS
CSCD
北大核心
1992年第3期102-108,146,共7页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金
关键词
现场动力测试
相位修正
结构力学
on-the-spot dynamic test
phase improvement
dynamic A/D preamplifier
