@article{39151,
  keywords = {example, dynamics, bifurcation-analysis, equation-free, simulators, coarse stability, coarse projective   integration, production line, re-entrant},
  author = {Zou and Kevrekidis and Armbruster},
  title = {Multiscale analysis of re-entrant production lines: An equation-free approach},
  abstract = { <p>The computer-assisted modeling of re-entrant production lines, and, in particular, simulation scalability, is attracting a lot of attention due to the importance of such lines in semiconductor manufacturing. Re-entrant flows lead to competition for processing capacity among the items produced, which significantly impacts their throughput time (TPT). Such production models naturally exhibit two time scales: a short one, characteristic of single items processed through individual machines, and a longer one, characteristic of the response time of the entire factory. Coarse-grained partial differential equations for the spatio-temporal evolution of a "phase density" were obtained through a kinetic theory approach in Armbruster and Ringhofer [Thermalized kinetic and fluid models for re-entrant supply chains, SIAM J. Multiscale Modeling Simul. 3(4) (2005) 782-800.] We take advantage of the time scale separation to directly solve such coarse-grained equations, even when we cannot derive them explicitly, through an equation-free computational approach. Short bursts of appropriately initialized stochastic fine-scale simulation are used to perform coarse projective integration on the phase density. The key step in this process is lifting: the construction of fine-scale, discrete realizations consistent with a given coarse-grained phase density field. We achieve this through computational evaluation of conditional distributions of a "phase velocity" at the limit of large item influxes. (c) 2006 Elsevier B.V. All rights reserved.</p> },
  year = {2006},
  journal = {Physica a-Statistical Mechanics and Its Applications},
  volume = {363},
  pages = {1-13},
  month = {04/2006},
  isbn = {0378-4371},
  language = {English},
}