Analysis Techniques For Man-Machine Systems Design

NATO UNCLASSIFIED13 AC/243(Panel 8)TR/7Volume 22.3. STATE ORIENTED VIEWThe state oriented view is applied to look at the time-dependent system behaviour that is characterized by systemstates and state transitions. A system state is decribed by a set of attributes characterizing the system at a given time.2.3.1. State oriented hierarchical relationshipsBy means of state oriented hierarchical relationships system states can be partitioned into substates.The state hierarchies can be represented in a list (2.3.1.1.) or as a diagram (2.3.1.2.).Fs2.3.1.1. Listing of state oriented hierarchical relationshipsExample: Hierarchical decomposition of ship propulsion system states.ship propulsion system states1. automatic control system states,I.diesel engine statesA. OFFB. ready to startC. blockedD. start failedE. pre-lubricatedF. ignitedG. idlingH. normal operation1. abnormal operation111. hydraulic clutch statesIV. diesel clutch statesG6V. gas turbine statesVI. gas turbine clutch statesVII. helical gear statesVIII. shaft statesIX. pitch propeller statesX. auxill. system statesA. pre-lubrication system states1. OFF2. ready to pre-lubricate3. pre-lubricating4. pre-lubrication failedB. lubrication system statesC. compressed air system statesD. cooling system statesN-