Abstract
In view of the existing electrical vibration monitoring traditional hydraulic pump vibration sensor, the high false alarm rate is susceptible to electromagnetic interference and is not easy to achieve long-term reliable monitoring, based on the design of a beam of the uniform strength structure of the fiber Bragg grating (FBG) vibration sensor. In this paper, based on the analysis of the vibration theory of the equal strength beam, the principle of FBG vibration tuning based on the equal intensity beam is derived. According to the practical application of the project, the structural dimensions of the equal strength beam are determined, and the optimization design of the vibrator is carried out. The finite element analysis of the sensor is carried out by ANSYS, and the first order resonant frequency is 94.739 Hz. The vibration test of the sensor is carried out by using the vibration frequency of 35 Hz and the vibration source of 50 Hz. The time domain and frequency domain analysis results of test data show that the sensor has good dynamic response characteristics, which can realize the accurate monitoring of the vibration frequency and meet the special requirements of vibration monitoring of hydraulic pump under specific environment.
Highlights
The mechanical vibration of the hydraulic system is one of the key factors that affect the reliability of the hydraulic system
In view of the above background, a kind of the fiber Bragg grating (FBG) vibration sensor based on the equal intensity beam is studied and designed in this paper, which has an important application value in the vibration monitoring and fault diagnosis of the hydraulic pump
Experimental measurement and analysis of the FBG vibration sensor According to the above theory and the results of the finite element analysis, the structural dimension of the equal intensity beam used in the FBG vibration sensor is determined as: the length of L is 50 mm, the width of b is 10 mm, and the thickness of h is 0.5 mm
Summary
The mechanical vibration of the hydraulic system is one of the key factors that affect the reliability of the hydraulic system. The traditional hydraulic pump vibration monitoring technology mainly uses electrical sensors as the signal acquisition unit to turn the vibration signal into electrical signal, by monitoring the electrical signal to indirectly reflect the size of the vibration, which is the most widely used vibration monitoring method [3, 4]. The advantages of this method are that the technology is mature, and the sensitivity is higher than the mechanical measurement. In view of the above background, a kind of the FBG vibration sensor based on the equal intensity beam is studied and designed in this paper, which has an important application value in the vibration monitoring and fault diagnosis of the hydraulic pump
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