An optical torque transducer for high-speed cutting

Pantaleo, Antonio; Pellerano, Achille; Pellerano, Stefano

doi:10.1088/0957-0233/17/2/014

Cited by 6 publications

(1 citation statement)

References 13 publications

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“…There are three existing problems that need to be solved in the dynamic torque measurement, namely: (1) sensing element; (2) power supply; (3) signal transmission. At present, most of the torque measuring methods, such as the resistance strain gauge method, optical torque measurement method and optical fiber measurement method [1][2][3][4], have not solved the three problems very well. SAW resonators consist of an IDT and shorted electrode gratings on both sides to form a resonant cavity.…”

Section: Introductionmentioning

confidence: 99%

Analyzing the installation angle error of a SAW torque sensor

Fan¹,

Ji²,

Cai³

2014

Meas. Sci. Technol.

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When a torque is applied to a shaft, normal strain oriented at ±45° direction to the shaft axis is at its maximum, which requires two one-port SAW resonators to be bonded to the shaft at ±45° to the shaft axis. In order to make the SAW torque sensitivity high enough, the installation angle error of two SAW resonators must be confined within ±5° according to our design requirement. However, there are few studies devoted to the installation angle analysis of a SAW torque sensor presently and the angle error was usually obtained by a manual method. Hence, we propose an approximation method to analyze the angle error. First, according to the sensitive mechanism of the SAW device to torque, the SAW torque sensitivity is deduced based on the linear piezoelectric constitutive equation and the perturbation theory. Then, when a torque is applied to the tested shaft, the stress condition of two SAW resonators mounted with an angle deviating from ±45° to the shaft axis, is analyzed. The angle error is obtained by means of the torque sensitivities of two orthogonal SAW resonators. Finally, the torque measurement system is constructed and the loading and unloading experiments are performed twice. The torque sensitivities of two SAW resonators are obtained by applying average and least square method to the experimental results. Based on the derived angle error estimation function, the angle error is estimated about 3.447°, which is close to the actual angle error 2.915°. The difference between the estimated angle and the actual angle is discussed. The validity of the proposed angle error analysis method is testified to by the experimental results.

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Section: Introductionmentioning

confidence: 99%