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FBG sensing structure, transfer characteristics and the contact force measurement

Author: MaShuang
Tutor: YangWenYu
School: Huazhong University of Science and Technology
Course: Mechanical and Electronic Engineering
Keywords: FBG sensing Compliant mechanism Normal contact force Non- uniform strain
CLC: TP212.14
Type: Master's thesis
Year: 2011
Downloads: 44
Quote: 0
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Abstract


FBG ( Fiber Bragg Grating ) sensor is a high-precision stress and strain sensors , has been widely used in large-scale civil engineering structures and a simple mechanical structure health monitoring , but generally only stay in a relatively simple stress-strain testing stage, while in the more FBG application of complex mechanical systems also belong to the blank fields. In this paper, FBG sensing structure , strain transfer characteristics, and the sensor holding a giant heavy machine operator interface contact force measurement application research . One of the major problems is the FBG sensor dimensions in the detection process , and non- uniform strain matching problem solving methods . In order to solve the mechanical system FBG sensing widespread deformation characteristics and the measured object matching problem between the dimensions of the FBG sensing technology and sensing properties of compliant mechanism is designed by combining a supple of plane deformation sensitive agencies, using the finite element analysis software for system characterization, and establish a corresponding mathematical model , and finally through the supple bodies input plane displacement measurement with FBG sensors calculate the amount of contrast and verify its feasibility. In order to solve the contact force between two objects measurement problems , the introduction of the measuring medium , through the finite element method and its sensing properties sensing structure is analyzed and discussed by the measured object with the same scale between FBG sensors caused non-uniform strain problems . Contact mechanics introduced in the elastic half- space theory , establish the contact interface of the normal contact force and the amount of FBG wavelength shift between the relational model. Finally, the FBG detection technology used in Qingdao Huadong Machinery Plant Forging manipulator jaws contact force measurements , to overcome the optical field environment fragile, the large number of signal noise and other issues , the measurement results consistent with the theoretical results , indicating that the proposed non-uniform strain field detection and identification of validity of the model .

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