Abstract
The principles and apparatus of measuring low frequency internal friction are described in this paper. The low frequency internal friction apparatus have been evidently improved in automation and functions since the Ke,s pendulum was invented in 1947. The degree of automation of the internal friction apparatus is elevated and the functions of the apparatus are increased/ strengthened. The resolution of internal friction is increased. The accuracy of strain and frequency is also enhanced. The scope of measuring parameters such as temperature, strain, frequency and so on is enlarged.
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