Auto-Regressive Time Series Modeling of Stochastic Surfaces
Authors:
B.N.P. Rao and V.S.R. Murti
Affilation:
Osmania University, India
Pages:
241 - 244
Keywords:
time-series, EDM, stochastic surface profiles
Abstract:
Roughness profiles of EDM surfaces were obtained from a perthometer and digitized through AUTO CAD. Fortran program was developed for fitting ARMA (n, n-1) models. A significant observation was that for the sinking electrode type. EDM generally AR (1) or AR (2) models were adequate but for wire cut EDM higher order models, generally ARMA (3,2) and ARMA (4,3) were required. The higher order models indicate additional factors like wire vibration influencing the dynamics of wire EDM process.
