Abstract
For the problem that the moving thermal boundary condition of workpiece is difficult to be measured directly in drilling process, an efficient estimation scheme is developed in this study. The proposed scheme takes into account the heat transfer characteristics of the drilling workpiece. Specifically, according to the moving boundary position of workpiece, the heat transfer system of drilling workpiece is approximated by several linear subspaces. Correspondingly, the estimation results of unknown variable are obtained by comprehensively weighting the estimated results obtained from linear subspaces. Both numerical simulations and experimental tests are utilized to prove the validity of the above scheme. Effects of some important factors such as aperture size and measurement errors on the estimation results are discussed in detail. Comparisons with the traditional scheme are also carried out. The results obtained indicate that the presented approach can effectively estimate the moving thermal boundary condition of workpiece, obviously reduce the calculation cost, and has good adaptive capability. This method can be used for online monitoring of the temperature distribution in drilling area, thereby ensuring the machining quality of the workpiece and the service life of the drilling tool.
Published Version
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