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Authors:Francesco Casella: Dipartimento di Elettronica e Informazione, Politecnico di Milano, Milano, Italy
Publication title:On the Formulation of Steady-State Initialization Problems in Object-Oriented Models of Closed Thermo-Hydraulic Systems
Conference:Proceedings of the 9th International MODELICA Conference; September 3-5; 2012; Munich; Germany
Publication type: Abstract and Fulltext
Issue:076
Article No.:021
Abstract:The object-oriented formulation of steady-state initialization for models of closed thermo-hydraulic systems yields singular problems; due to system-wide structural issues. The paper proposes how to solve this problem in an object-oriented fashion; by means of an additional component that helps to uniquely determine the initial conditions of the system. A method based on the analysis of the null space of the Jacobian of the initialization problem and on suitable annotations is also proposed to provide the end user with meaningful; high-level; context-relevant diagnostic messages; in case the singular problem arises. This diagnostic method can also be applied to other cases; such as closed systems with constant density fluid and electrical circuits lacking a ground connection.
Language:English
Keywords:Thermo-hydraulic system modelling; Initialization; User-friendly error diagnostics
Year:2012
No. of pages:8
Pages:215-222
ISBN:978-91-7519-826-2
Series:Linköping Electronic Conference Proceedings
ISSN (print):1650-3686
ISSN (online):1650-3740
File:http://www.ep.liu.se/ecp/076/021/ecp12076021.pdf
Available:2012-11-19
Publisher:Linköping University Electronic Press; Linköpings universitet

REFERENCE TO THIS PAGE
Francesco Casella (2012). On the Formulation of Steady-State Initialization Problems in Object-Oriented Models of Closed Thermo-Hydraulic Systems, Proceedings of the 9th International MODELICA Conference; September 3-5; 2012; Munich; Germany http://dx.doi.org/10.3384/ecp12076215 (accessed 12/21/2014)