A New Type of Electroacoustic Transducer Used for Downhole Acoustic Telemetry System

The high power and low frequency electroacoustic transducer plays a very important role in the underground acoustic telemetry system used for petroleum industry. How to realize electroacoustic conversion technology with the giant magnetostrictive materials was studied in this paper. The principles and methods of how to design it were proposed and the experimental verification was achieved. Results show that the electroacoustic transducer based on giant magnetostrictive materials features high-power and low-frequency output, high conversion efficiency, high temperature resistance, and excellent performance. It can completely meet the needs of the downhole acoustic telemetry system.

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Research on the Cascade-Connected Transducer with Multi-Segment Used in the Acoustic Telemetry System while Drilling

Micromachines ◽

10.3390/mi10100712 ◽

2019 ◽

Vol 10 (10) ◽

pp. 712

Author(s):

Duo Teng

Keyword(s):

Finite Element ◽

High Power ◽

Acoustic Telemetry ◽

Low Frequency ◽

Mode Shapes ◽

Telemetry System ◽

The Finite Element Method ◽

Electroacoustic Transducer ◽

Flexural Vibrations ◽

The Cross

The electroacoustic transducer with the performances of low frequency, small size, and high power is desired in the application of the acoustic telemetry system while drilling. In order to fulfill the severe requirements, a novel cascade-connected transducer with multi-segment is developed. The essential framework of such a transducer is to add the cross-beams in the multi-segment cascade-connected arrangement, based on the fundamental configuration of the longitudinal transducer. The flexural vibrations of cross-beams help the transducer to present the appropriate coupling between longitudinal and flexural vibrations, which provide many benefits in keeping the advantages of the longitudinal transducer and lowering the resonance frequency. It is the finite element method to be used for simulating the mode shapes of the cascade-connected transducer, especially the behavior of the cross-beams, and some performances of transducer are also predicted. Several prototypes of cascade-connected transducers with different segments are manufactured. Their related tests show a good agreement with the finite element simulations and analyses. Their characteristics of low frequency, small size, light weight, and high power are attractive for the transmitting or receiving application in the acoustic telemetry system while drilling.

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A Design and Research on GMM Precision Flow Pump

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.602-605.117 ◽

2014 ◽

Vol 602-605 ◽

pp. 117-121

Author(s):

De Hui Liu ◽

Li Wen Liu ◽

Gang Tang ◽

Hong Min Wen ◽

Quan Guo Lu

Keyword(s):

Maximum Output ◽

Output Pressure ◽

Pump Flow ◽

Magnetostrictive Materials ◽

Giant Magnetostrictive Materials ◽

New Type ◽

Driving Source ◽

Flow Pump

A new type of the precision flow pump is developed with the giant magnetostrictive materials as the driving source. Experiment has been conducted to test the performance of the pump with designed key components. The pump as the preloading mechanism, adopting an elastomer instead of a spring, not only simplifies the structure, but also improves the performance of the pump. A design is also made to some key components such as the giant magnetostrictive rod and driving coil. The result of experiment shows that the pump flow resolution records 1 ml/min~400ml/min and the maximum output pressure 0.6 MPa, which means the performance of this kind of pump is superior to ordinary diaphragm pumps.

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