中文摘要：

分析了基于扭摆的力学谱仪在强迫振动模式下进行内耗测量时的系统误差,指出这一误差主要来源于测控系统中的电路延时和机械波传播延时。提出测量系统总延时的方法,并应用实验测量得到的系统总延时对测量结果进行了修正,从而使基于扭摆的力学谱仪在强迫振动模式下得到更为准确的的固体内耗及液体黏度。

英文摘要：

The systematical error of the pendulumbased mechanical spectra instrument is analyzed in the forced vibration mode, it is found that the error mainly originates from both mechanical and circular de lays enlarging the phase lag for the strain behind the stress. Furthermore, a scheme to measure these sys tematic delays and correct the phase lag is proposed, which greatly improves the precision for both the in terual friction of solid and the viscosity of liquid.