Analysis of underground ventilation networks utilizing the skyline nodal pressure method

Kyuro Sasaki, Yutaka Fukuda, Hiroshi Miyakoshi

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A calculation system for the analysis of underground ventilation networks by means of a nodal pressure method using the skyline modified Choleski's decomposition scheme, named 'skyline nodal pressure method', has been studied. The generalized linear equations for solving steady state ventilation airflow have been developed using a connective function between nodes. The skyline decomposition scheme has an advantage on rapid convergence and the sake of computer memory space as compared with other schemes. Five examples of venti-lation networks have been calculated using a popular personal computer. A convergence criterion, that the maximum error of the summed airflow quantity in continuity at each node is less than 0.1 m3/min, was used for the calculations. Under the conditions that the fan-pressure is given as a constant value and that the acceleration factor is set at 1.4, the number of the iterations until convergence was not more than 13 for each network. The calcu-lation processing time by the skyline nodal method is roughly in proportion to the total number of nodes to the 3/2 power.
Original languageEnglish
Title of host publicationInnovative Mine Design for the 21st Centuryn; Proceedings of International Conference on Mine Design
Editors W. F. Bawden, J.F. Archibald
Place of PublicationNetherland
PublisherA.A. Balkema
Number of pages12
ISBN (Print)9054103256
Publication statusPublished - Jul 1993
EventInternational Congress on Mine Design: Innovative Mine Design for the 21st Century - Kingston, Canada
Duration: Aug 22 1993Aug 25 1993


ConferenceInternational Congress on Mine Design

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)
  • Safety Research
  • Public Health, Environmental and Occupational Health


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