Design Innovation

Self-Powered Telemetric Torque Meter

[+] Author and Article Information
Abel Cavalcante Lima Filho

Department of Mechanical Engineering, Federal University of Paraiba, Cidade Universitaria, 58051-900 Joao Pessoa, Paraiba, Brazilabel@les.ufpb.br

Francisco Antônio Belo

Department of Electrical Engineering, Federal University of Paraiba, Cidade Universitaria, 58051-900 Joao Pessoa, Paraiba, Brazilbelo@les.ufpb.br

Jerry Lee Alves dos Santos

Department of Computer Science, Federal University of Paraiba, Cidade Universitaria, 58051-900 Joao Pessoa, Paraiba, Braziljerry@les.ufpb.br

Eudisley Gomes dos Anjos

Department of Informatics Engineering, University of Coimbra, Pólo II, Pinhal de Marrocos, 3030-290 Coimbra, Portugaleudis@dei.uc.pt

J. Dyn. Sys., Meas., Control 133(4), 045001 (Apr 07, 2011) (7 pages) doi:10.1115/1.4003264 History: Received January 25, 2010; Revised September 02, 2010; Published April 07, 2011; Online April 07, 2011

This paper presents a self-powered telemetric torque meter. The idealized instrument uses strain gauge, telemetry, and LABVIEW graphic programming. The electronic transduction signal is transmitted by digital modulation from a remote transduction unit fixed to a rotation shaft to a base station sending signals to a personal computer (PC) by means of a virtual instrument developed in LABVIEW . The signal can also be delivered to other units besides the PC. The ZigBee/IEEE 802.15.4 protocol is the standard protocol for wireless communications and is highly used in industrial monitoring and control applications. A low-noise method for supplying the remote transduction unit components in the rotation shaft—using its rotating movement to generate the demanded energy—has also been developed. After extensive experimentation, the theoretical model seems to confirm the idea proposed. The system presented in this study is robust, precise, cost-effective, and has high-noise immunity even in abrasive and strong vibration environments.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

Schematic of the rf instrumentation system proposed in this study

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Figure 2

Stress diagram of an element in a circular torsion bar

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Figure 3

Proposed electronic conditioner circuit

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Figure 4

Electromechanical generator (self-supplying power system)

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Figure 5

Cell generation of the electromechanical generator

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Figure 6

Telemetry system for the torque determination applied in a pumping unit for oil extraction

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Figure 7

Bench for static torque acquisitions and calibration

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Figure 8

Calculating static torque for calibration

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Figure 9

Experimental results for static torque acquisitions: (i) regression curve for torque calibration and (ii) the linearity error with respect to the best-fit line

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Figure 10

Illustration of the instrumentation used to calculate the reference torque

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Figure 11

Curves of measurement torque (T) and the reference torque (Tref) versus angle of the vane

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Figure 12

Strain gauges arranged in the shaft for the pumping unit application

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Figure 13

Practical application: curves of torque measure in a pumping unit

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Figure 14

Experimental results for dynamic torque acquisitions: (i) regression curve for torque versus reducer shaft speed and (ii) the best-fit line




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