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本文通过对瞬变动力学参量和桥梁振动参量如压力、应力(应变)、振动加速度、速度、位移等的实测波形利用通用和专用计算机进行谱分析、相关分析及数字滤波和波形积分、参量变换等进行数据处理。提出了能给出12种结果的傅里叶积分不等步长计算方案,得出了计算结果;讨论了动力学参量之间的相互关系;论述了波形基线移动、离散采样、数据长度和窗口形状等对谱分析的影响;探讨了频谱分析中获得的主频率与结构自振频率的关系;通过相关函数和自谱、互谱分析求得结构的自振频率和振型;并进行了频域数字滤波的实际应用研究。
In this paper, general and special-purpose computers are used for spectrum analysis, correlation analysis, digital filtering, waveform integration, and parametric transformation, etc. for measured waveforms of transient dynamic parameters and bridge vibration parameters such as pressure, stress (strain), vibration acceleration, speed, and displacement. Perform data processing. A scheme for calculating the unequal step size of the Fourier integral which can give 12 results is proposed, and the calculation results are obtained. The relationship between the dynamic parameters is discussed; the baseline movement of the waveform, the discrete sampling, the data length and the window are discussed. The influence of the shape on the spectrum analysis; the relationship between the main frequency obtained from the frequency spectrum analysis and the structure’s natural frequency; the self-resonant frequency and mode shape of the structure obtained by the correlation function and the self-spectrum and cross-spectrum analysis; and the frequency Practical application research of domain digital filtering.