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块体基础强迫振动是测试地基动力参数的一种原位测试方法,为动力机器基础设计提供地基动力参数。强迫振动测试的激振源可以是变扰力机械式激振器或者恒扰力电磁式激振器,前者因谐振性好、扰力大,测试效果更好,尤其是在扭转强迫振动测试方面,机械式综合激振器易于实现两台激振器输出扰力相位的一致性,优势更加明显。分析处理程序采用Z变换高精度频谱分析技术和振幅曲线拟合分析技术,大大提高了测试信号的频率和振幅分析精度。该项测试技术克服了电磁激振器扰力小、相位不同步的缺点,具有很好的应用价值。
Forced vibration of block foundation is a kind of in situ test method for testing the dynamic parameters of foundations, and provides foundation dynamic parameters for foundation design of dynamic machines. Forced vibration test excitation source can be a variable-force mechanical exciter or a constant-force electromagnetic exciter, the former due to good resonance, large disturbance, the test results are better, especially in the torsional forced vibration test , Mechanical integrated exciter easy to achieve the consistency of the output of two exciter interference phase, the advantage is more obvious. The analysis and processing program uses Z-transform high-precision spectral analysis technique and amplitude curve fitting analysis technique, which greatly improves the frequency and amplitude analysis accuracy of the test signal. The test technology to overcome the electromagnetic exciter small disturbance, the phase is not synchronized with the shortcomings of good value.