The Resonance Frequency and Damping Analysis (RFDA) is now a common experimental technique to measure the elastic moduli of materials vs. temperature. Nevertheless, the elastic moduli are calculated assuming that the frequency measured is the natural one, not impacted by any damping. In oxide glasses, a significant damping occurs below the glass transition temperature, and it may impact the frequency measured, the elastic moduli calculated, as well as the estimated glass transition temperature. We show here, using the equations of linear viscoelasticity, how we can know if the frequency measured is significantly lowered by damping, and how we can estimate the natural frequency to calculate the correct elastic moduli, only from the data provided by the RFDA: the frequency measured and the damping.

共振频率和阻尼分析（RFDA）现在是测量材料相对于温度的弹性模量的常用实验技术。不过，弹性模量是在假定测得的频率为自然频率而不受任何阻尼影响的情况下计算的。在氧化物玻璃中，在玻璃化转变温度以下会产生很大的阻尼，这可能会影响测得的频率，计算出的弹性模量以及估计的玻璃化转变温度。我们仅使用RFDA提供的数据，使用线性粘弹性方程式展示如何知道如何通过阻尼显着降低测得的频率，以及如何估算固有频率以计算出正确的弹性模量：实测频率和阻尼。