Study of Identification Method for Stiffness and Damping of Joint Interface of Machine Tool

• Main Authors: Jian-De Li, 李建德
• Other Authors: Jau-Liang Chen
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/00248615108743857367

碩士 === 國立中興大學 === 機械工程學系所 === 105 === In this study, the stiffness and damping of the interface between the slider and the guide rail of the machine tool are identified. In the identification of the stiffness, the models of the single casting base and the saddle model are being established. Then, the eigenvalues and eigenvectors for both models are extracted. The optimization method together with design sensitivity analysis is being used for searching the optimal parameters. Finally, the assembly model of the base and saddle was established. The parameters found in previous were substituted into the model and performed modal analysis. The analysis results were then compared with experimental results for determining the correct stiffness of the joint interface. For the identification of damping, the damping coefficient of the joint surface is firstly derived. The damping coefficient is then substituted into the model for the harmonic response analysis. Finally, the analysis results are compared with the experimental results for determining the correct damping coefficient of the joint interface. Compare with the modal simulation results and experimental results, it is found that the errors of the first-, third-, and forth-mode natural frequencies are 0.467%, -2.83% and -3.013% respectively. While, the trend of the harmonic response analysis result near the first resonance frequency was also agree with the experimental result.