J4 ›› 2014, Vol. 41 ›› Issue (3): 169-173.doi: 10.3969/j.issn.1001-2400.2014.03.025

• Original Articles • Previous Articles     Next Articles

On efficient estimation of reachable markings for S3PR

HONG Liang   

  1. (School of Mechano-electronic Engineering, Xidian Univ., Xi'an  710071, China)
  • Received:2013-01-31 Online:2014-06-20 Published:2014-07-10
  • Contact: HONG Liang E-mail:hongliang20030605@163.com

Abstract:

This paper proposes a method that deals with an approximate calculation of the number of reachable markings of an S3PR in an algebraic way. Based on combinatorics, we find an upper bound of reachable markings of an S3PR. Then we try to find the number of unreachable markings by extracting siphons with two resource places. The obtained number covers most or even all of the unreachable markings. Finally, we can estimate the number of reachable markings by removing the unreachable ones from the upper bound. Calculations and analyses verify the effectiveness of the proposed method.

Key words: flexible manufacturing system, Petri net, siphon, reachable marking