A bending deflection measuring method of inner/outer cylindrical surface parts

Abstract

• A measuring method is proposed for bending deflection of cylindrical surface parts. • Peak-valley enveloping method and its algorithm are given for measuring method. • Numerical simulation, algorithm accuracy and reliability are studied and verified. • Results of the method specialized rig are verified by commercial testing equipment. • Design method of operation parameters used by measuring algorithm is provided. Inner/outer cylindrical surface parts are often applied into all kinds of machines. The bending deformation of these parts will affect the working performance and service life of the machine. A non-contact measuring method only using a displacement sensor and a guide rail for bending deflection is proposed in this paper. A peak-valley enveloping algorithm derived through rigorous mathematical molding and analysis can be utilized to obtain the eccentricity, direction and the corresponding cross-section position, and then the axis deflection curve can be determined. The error analysis of numerical simulation results shows that the method proposed in this paper can feature a high accuracy by setting appropriate operation parameters. Then, a specialized experiment is carried out to prove the correctness and reliability of the measuring method proposed by comparing with commercial instrument results. Finally, a parameter design method is provided to match the algorithm calculation time and measuring accuracy.