A novel in-plane mode rotary ultrasonic motor is designed in this *** Langevin type bending vibrators are placed separately around the ring shaped stator and used to excite an in-plane vibration mode of the ring *** t...
详细信息
ISBN:
(纸本)9781467348140
A novel in-plane mode rotary ultrasonic motor is designed in this *** Langevin type bending vibrators are placed separately around the ring shaped stator and used to excite an in-plane vibration mode of the ring *** tapered rotors are assembled to the inner ring of the stator and clamped together by screw nut.A thin cylindrical supporting is placed under the stator ring,which makes the motor more stable and convenient to *** ultrasonic motor has no bearings,which is good at operating in cryogenic and vacuum environment.
Wavefields excited by a dipole source with ampUtude mismatch are investigated through a 3D finite difference *** is revealed that the directional patterns of a dipole source mainly depend on the source frequency and t...
详细信息
ISBN:
(纸本)9781467348140
Wavefields excited by a dipole source with ampUtude mismatch are investigated through a 3D finite difference *** is revealed that the directional patterns of a dipole source mainly depend on the source frequency and the ampUtude ratio of the two monopoles combining the transmitter.A mismatched dipole will not generate the non-dipole components in the borehole as long as the dipole receivers are ideally *** both the transmitter and receivers are mismatched,the Stoneley mode with strong amplitudes appears in the in-line and cross-line components of the cross-dipole sonic logging *** would probably lead to incorrect evaluations of shear velocity and azimuthal anisotropy of the formation.
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