A radial fiber grating torsional vibration sensor and its measuring method
A fiber grating and sensor technology, which is applied to measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve problems such as poor anti-electromagnetic interference, difficult signal transmission, and indirect method measurement accuracy can not meet the requirements, etc., to achieve cost Low, precise measurement, small size effect
Inactive Publication Date: 2019-05-24
WUHAN UNIV OF TECH
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Problems solved by technology
However, contact measurement has problems such as difficult signal transmission and poor anti-electromagnetic interference ability. Non-contact measurement has very high requirements on the accuracy of experimental equipment, and it is generally difficult to meet the measurement accuracy requirements. The indirect method measurement accuracy cannot meet the requirements.
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[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0017] Such as figure 1 with figure 2 As shown, a radial fiber grating torsional vibration sensor includes a disk body 1 that can be installed on the rotating shaft and is perpendicular to the axis center. The disk body 1 is provided with four columns 4 and two Limiting groove 5, the two limiting grooves 5 are symmetrical about the axis, the four columns 4 are respectively located on both sides of the two limiting grooves 5 and the distances from the limiting grooves 5 are equal, and the two limiting grooves 5 are respectively There are two mass blocks 2, and one optical fiber closely passes through the centers of the two mass blocks 2 without interfering with the limiting groove 5 (the through hole on the mass block 2 is slightly larger than the optical fiber, which is equivalent to the fixed mass of the mass block 2 On the optical fiber), the opti...
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The invention relates to a radial fiber bragg grating torsional vibration sensor and a measurement method. The sensor comprises a plate body, wherein four stand columns and two spacing grooves are arranged on the plate body and are positioned on the same straight line; the two spacing grooves are symmetric to the axis; the four stand columns are respectively positioned on two sides of the two spacing grooves, and are at equal interval with the spacing grooves; two mass blocks are respectively arranged in the two spacing grooves; an optical fiber does not interfere with the spacing grooves, closely runs through the center of the two mass blocks, is fixed on the four stand columns with a certain pretightening force to suspend the mass blocks in the spacing grooves, and is provided with four fiber gragg gratings on four positions between the spacing grooves and the stand columns, a relationship between the accelerated speed and the drifting distance of fiber bragg grating wavelength is established during measurement, and a torsional vibration signal can be obtained. The sensor can be used for eliminating inference of radial vibration on torsional vibration, has the effect of temperature compensation, and has the advantages of accurate torsional vibration measurement, electromagnetic interference resistance, small size and low cost.
Description
technical field [0001] The invention belongs to the technical field of mechanical vibration measurement, and in particular relates to a radial fiber grating torsional vibration sensor and a measurement method. Background technique [0002] In all kinds of rotary machinery, the torsional vibration of the shaft (torsional vibration) is an important vibration form. Torsional vibration is the rotational vibration caused by the change of torque acting on the shaft with time. The accumulation of torsional stress changes caused by torsional vibration often causes sudden accidents. Monitoring the running state of the main shaft through torsional vibration signals can not only prevent The occurrence of disasters and accidents can also be used for damage detection and fault diagnosis of shafts and related components. [0003] There are two types of methods for measuring torsional vibration: direct method and indirect method. The direct method is to directly sense the torsional vibrat...
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IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 魏莉王兢兢李瑞亚
Owner WUHAN UNIV OF TECH