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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 4/23/2014)