Abstract
This paper proposes a new type of torsional vibration sensor based on fiber Bragg grating (FBG). The sensor has two mass ball optical fiber systems. The optical fiber is directly treated as an elastomer and a mass ball is fixed in the middle of the fiber in each mass ball fiber system, which is advantageously small, lightweight, and has anti-electromagnetic interference properties. The torsional vibration signal can be calculated by the four FBGs’ wavelength shifts, which are caused by mass balls. The difference in the two sets of mass ball optical fiber systems achieves anti-horizontal vibration and anti-temperature interference. The principle and model of the sensor, as well as numerical analysis and structural parameter design, are introduced. The experimental conclusions show that the minimum torsional natural frequency of the sensor is 27.35 Hz and the torsional vibration measurement sensitivity is 0.3603 pm/(rad/s2).
Highlights
Rotating machinery has become an important branch of mechanical equipment and is widely used in industrial production
Sensor is fixed at the exciter, the exciter, signal of to the computer via the piezoelectric sensor is vibration fixed at the vibration thewhich signalisoftransmitted which is transmitted to the computer collecting module,module, so we can record the magnitude of the acceleration of the of excitation signalsignal from via the collecting so we can record the magnitude of the acceleration the excitation the piezoelectric acceleration sensor. sensor
The fiber optical fiberinterface output interface of torsional the fiber Bragg grating (FBG) vibration torsional sensor is connected to FBG interrogator, which is connected the computer which the signal vibration sensor is connected to FBG interrogator, which is to connected to theon computer onFBG
Summary
Rotating machinery has become an important branch of mechanical equipment and is widely used in industrial production. Kruger et al [18] stuck two FBGs on opposite sides of the shaft in the direction of 45 ◦ along the axis to measure torsional vibration On this basis, Li et al [19] established a complete strain sensing model and analyzed the decoupling principle of bending and torsional coupled vibrations, which was verified by experiments on a rotor platform. Li et al [19] established a complete strain sensing model and analyzed the decoupling principle of bending and torsional coupled vibrations, which was verified by experiments on a rotor platform The theory of this measurement method is based on the equal diameter circular axis, so it is not applicable to stepped axes. The combination of the two sets of mass ball optical fiber systems effectively resists transverse vibration and temperature interference
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