**3. Approach to the HSCOCS software development**

Approach to the HSCSOS software development is based on the application of the simulation modeling for analysis for the IRLSS system performance in the normal, offnormal and emergency situations, the monitoring of the environmental controllable parameter values and efficient assessment of the crew's actions when off-normal situations are being localized. The simulation model is a logic-mathematical description of the object which may be applied to staging computational experiments in designing, analyzing and assessing object functioning.

Simulation modeling as a specific type of modeling is applied when:


The analysis results of the IRLSS performance show that the HSCSOS software architecture shall include the following interacting units (Figure 2):


Fig. 1. Integrated Regenerative Life-Support System baseline selected for HSCSOS.

Approach to the HSCSOS software development is based on the application of the simulation modeling for analysis for the IRLSS system performance in the normal, offnormal and emergency situations, the monitoring of the environmental controllable parameter values and efficient assessment of the crew's actions when off-normal situations are being localized. The simulation model is a logic-mathematical description of the object which may be applied to staging computational experiments in designing, analyzing and

• an analytical model cannot be built (there is cause/effect relationships, how-linearity,

The analysis results of the IRLSS performance show that the HSCSOS software architecture

• a simulation model of the PMM atmosphere integrating the VSs as a whole and

• a crew simulation model as component of environment governing the loads on

• procedures for generating probable off-normal situation (ONS) in operation of the IRLSS system, ONS identification and preparation of guidelines and rules for crew in

providing the monitoring of crew's environment controllable parameters;

**3. Approach to the HSCOCS software development** 

Simulation modeling as a specific type of modeling is applied when: • an experiment upon an actual object is difficult or impossible;

• IRLSS individual system functioning Virtual Simulators (VS);

assessing object functioning.

stochastic variables);

individual systems;

localization of given ONS;

• time dependent system mode of operation.

shall include the following interacting units (Figure 2):


In complex development such as the HSCSOS it is most important for formation of the closed formalized description to select the approaches for generation a closed formalized description of the above specific components of the complex architecture in order to obtain required and sufficient information on system performance analysis in normal and offnormal situations.

Fig. 2. The architecture and basic functions of the HSCSOS software some components.
