Fiber grating torsional vibration sensor based on the principle of inertia

Abstract

The invention aims at providing a fiber grating torsional vibration sensor based on the principle of inertia. The sensor comprises a base body, two assembling units, and four fiber gratings. The basebody consists of a shaft ring, two fiber fixed rings, and two connecting plates. The assembling units include pedestals, uniform-cross-section beams, and mass blocks that are connected successively; the mass blocks of the two assembling units are arranged in gaps between the end portions of the fiber fixed rings; and the two fibers pass through through holes formed in the two mass blocks and are fixed by packaging slots formed in the end portions of the fiber fixed rings at the two sides of the mass blocks. The four gratings are suspended between the mass blocks and the packaging slots. According to the sensor provided by the invention, on the basis of the principle of inertia, the acceleration speed of the torsional vibration angle is measured; the structure is simple and the sensor is installed conveniently; the interference on torsional vibration measurement by axial vibration and the transverse vibration of a rotating shaft can be eliminated; and the sensor also has a temperature self-compensation function.

Description

technical field [0001] The invention belongs to the field of vibration measurement, in particular to a fiber grating torsional vibration sensor based on the principle of inertia. Background technique [0002] Mechanical vibration generally has three manifestations, namely axial vibration, lateral vibration and torsional vibration. Among them, torsional vibration is a common vibration form of rotating machinery vibration. When the rotating shaft is working, it will be subjected to active torque (input torque) and load torque (output torque). Different parts on the shaft will rotate relative to each other. When the two torques are balanced, the torsional deformation remains unchanged, and the relative torsion angle of each part on the shaft remains unchanged. However, in fact, the resultant torque of the two torques is not zero, but in Small-scale fluctuations, which cause the shaft to generate torsional vibration around the axis. The specific performance is that the relative...

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Problems solved by technology

[0003] At present, there are many torsional vibration sensors that characterize the torsional vibration signal by measuring the change of the angular acceleration of the shaft. This type of sensor mainly installs an accelerometer or an inertial measurement device on the shaft, and the measurement signal can be passed through a collector ring or wired or radio It is cumbersome to transmit to the instrument through cable or collector ring, and it is easy to distort the signal at high speed, and it is easy to be affected by electromagnetic interference through radio transmission.

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