Lee T, Lakes R S
Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, WI 53706-1687, USA.
IEEE Trans Ultrason Ferroelectr Freq Control. 2001 Jan;48(1):48-52. doi: 10.1109/58.895906.
Mechanical damping, tan delta, of lead metaniobate was determined experimentally over a wide range of frequency. Damping at audio and sub-audio frequency was lower than at ultrasonic frequency. The experiments were conducted in torsion and bending using an instrument capable of determining viscoelastic properties over more than 10 decades of time and frequency. Mechanical damping was higher in bending than torsion at all frequencies. Damping observed in this study at the highest frequencies approach the high value 0.09 previously observed at ultrasonic frequency.
通过实验测定了铌酸铅在很宽频率范围内的机械阻尼（损耗因数）。音频和亚音频频率下的阻尼低于超声频率下的阻尼。实验是在扭转和弯曲状态下使用一种能够在超过10个数量级的时间和频率范围内测定粘弹性特性的仪器进行的。在所有频率下，弯曲时的机械阻尼都高于扭转时的。本研究中在最高频率下观察到的阻尼接近先前在超声频率下观察到的0.09的高值。
