| 摘要 |
A transducer and method for imparting vibrational signals to a structure are disclosed. In one embodiment, a set of piezoelectric disks are constructed in conjunction with a deformable housing to impart controlled distortions to the structure, such as to a well pipe string. Torsional forces are applied to the structure due to the orientation of the piezoelectric material relative to the electric field applied thereto. The piezoelectric material is placed in layers, with the polarization axis orthogonal to the direction of the electric field. Alternate layers are oriented in opposing directions, and alternating electrodes are connected together, so that each layer cooperates with the others to twist the housing in the same direction. To improve transmission, the apparatus can be tuned to a frequency determined by a spectrum analysis of the pipe string. A reactance mass may be connected to the transducer to increase the amplitude of the imparted vibrations, and also to allow tuning of the frequency of vibrations of the transducer.
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