【摘要】 时频分析是近年发展起来的一种新的数学分析方法,这里应用时频分析的方法分析混凝土构件质量。对于混凝土构件的高频地震数据,利用自编的MATLAB程序进行短时傅里叶变换,提取各时窗的主频,然后用SURFER绘制时间-频率等值线图。在利用时频分析方法对混凝土模型和实际资料进行处理后的结果表明,应用时频分析方法可以极大地提高分辨率和实用性。更多还原

【Abstract】 The time-frequency analysis is one of developed new mathematical analyses recently.A method that time-frequency analysis is presented for analyzing the concrete elements in this paper.We programmed a program with the MATLAB to process the high-frequency seismic data of concrete elements by the short-time Fourier transform and extract the master frequency of each window,and we draw a time-frequency isoanomaly line with SURFER.Applying the method of time-frequency analysis we processed the concrete model data and the field data.It is showed that the resolution power and practicability are greatly increased from the time-frequency analysis.更多还原