State monitoring and fault diagnosis of an internal combustion engine are critical for complex machinery safety. In the present\nstudy, a high-frequency vibration system was proposed based on Fiber Bragg Grating (FBG) cantilever sensor and intelligent\nalgorithm. Structural vibration signal containing fault information of engine valves and oil nozzle was identified by FBG sensors\nand preprocessed using wavelet decomposition and reconstruction. Moreover, vibration energy was taken as fault characteristics......
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