Abstract：Vibration signal is an important source of information for mechanical equipment fault diagnosis.In order to overcome the system demolition problem of traditional detection methods, this paper innovatively uses the fiber grating sensing method to perform non-intrusive vibration measurement on the hydraulic pump, and fully utilizes the advantages of the optical fiber sensing with strong anti-electromagnetic interference, corrosion resistance, good stability, and high sensitivity measurement.The original fiber Bragg grating vibration sensor was analyzed, and a double equal strength cantilever beam fiber Bragg grating (FBG) vibration sensor was designed and simulated.Based on this, a fiber Bragg grating demodulation system and a vibration test table for the sensor were used.The performance was verified by experiments, and the sensitivity of the sensor was 0.024 nm/(m?s-2), the natural frequency was 185 Hz, and the linearity was good.The modal analysis of the axial piston pump was optimized to arrange the sensing sampling point.Actually the vibration signal of the pump was measured.The research results can provide reliable data support for non-intrusive condition monitoring and fault diagnosis of hydraulic pumps.
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