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Implementation of Automatic Control Features in ESATAN Models
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English
Abstract
The representation of functions of Environment Control and Life Support Systems in ESATAN Models requires the implementation of automatic control features. Mainly the air temperature and air mass flow are subject to automatic control.
This paper shows - as an example - the implementation of a PI- (Proportional- and Integral-) Controller to represent the effects of automatic control of HERMES ECLSS.
Implementing these functions in ESATAN requires different approaches for steady state and transient solutions. The control algorithm is implemented in the model so that it is passed through in each timestep. Hence the setting of the active components is updated in each timestep. For the calculation of steady state cases the control algorithm had to be implemented so that the controller parameters are not timestep dependent.
The paper shows that active control features can be implemented in ESATAN Models by adding some subroutines. The models can give valuable information on the control strategy to choose and on the layout of the controller. Furthermore transient effects can be studied in more detail due to the fact that the transient effects of automatic control features are accounted for.
Authors
Citation
Hofacker, W., Lucas, J., and Schilke, J., "Implementation of Automatic Control Features in ESATAN Models," SAE Technical Paper 911583, 1991, https://doi.org/10.4271/911583.Also In
References
- ESATAN user manual UM-ESATAN-004 07 12 89
- Thermal Analysis of the Habitable Volumes of Hermes Rothmeyer M. et.al. Dornier GmbH 1989 ICES Conference 1989
- Linear Control Systems Melsa J.L. et. al. McGraw Hill 1969
- Modern Control System Theory and Applications Shinners S.M. Addison-Wesley Publ.Comp. 1972