FILTERING CHARACTERISTICS OF A LONG CYLINDRICAL STEEL BAR WITH DISCONTINUITIES IN ITS CROSS-SECTIONAL AREA.
HOUSTON UNIV TEX DEPT OF MECHANICAL ENGINEERING
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In terms of a mechanical-electrical analogy, a four-terminal electrical network is synthesized which has the characteristics of string of drill pipe subjected to longitudinal vibrations. Electrically, it is a Pi-section band-pass filter composed of passive, non-dissipative components which take their properties from the physical characteristics of the mechanical system, including the distance between discontinuities and the area ratios at the discontinuities. The attenuation characteristics of a typical drill string model are given as a function of frequency. The pass- and stop-bands for the system are discussed. Author