A three-dimensional micro-deformation perception and reconstruction method for connecting rod based on FBG.

• We build a system to sense the micro-deformation of connecting rods. • We design a connecting rod sensing network based on FBG. It not only detects the deformation of the connecting rod after compression but also detects the deformation of the connecting rod in the tensile state. • The work provides a new detection scheme to ensure the machining quality of connecting rods. As a key component of the ship power equipment, the deformation of the connecting rod directly affects its performance and life. Therefore, the deformation detection of the connecting rod plays an important role in ensuring the service life of the power equipment. In this paper, we propose a deformation perception and reconstruction method based on fiber Bragg grating (FBG) for the connecting rod of the marine diesel engine. According to the deformation characteristics under loads of different sizes and directions obtained from the finite element, a sensing distribution FBG-based is designed for the connecting rod. On this basis, we establish the FBG-based deformation sensing system and develop a three-dimensional deformation reconstruction model, which can realize the real-time monitoring of the deformation during the processing of the connecting rod. The experiments show that the deformation trends obtained by FBG and finite element are consistent. Therefore, the FBG-based deformation perception and reconstruction method is feasible. It provides a new and accurate detection scheme to ensure the processing quality of the connecting rod and a new idea for the deformation detection of other key parts of the ship power equipment. [ABSTRACT FROM AUTHOR]