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提出了一种基于能量守恒原理计算地基土阻尼比的新方法。不同于对数衰减法仅依据振幅计算阻尼比,该方法考虑了体系振动的整个反应时程,克服了对数衰减法对幅值测量精度要求很高的缺陷。数值仿真和实测结果表明:与对数衰减法相比,该方法计算精度较高,抗干扰能力强,稳定性好,即便对于信号干扰比较大的情况,采用该方法也能得到较好的结果。
A new method to calculate the damping ratio of foundation soil based on energy conservation principle is proposed. Different from the logarithmic decay method, the damping ratio is calculated based on the amplitude only. The method considers the whole reaction time of the system vibration and overcomes the defect that the logarithmic decay method requires high precision of the amplitude measurement. The numerical simulation and experimental results show that compared with the logarithmic decrement method, this method has higher computational accuracy, better anti-jamming ability and better stability. The method can get better results even with large signal interference.