Strohl 4/3/11 OSD assignment Background The person completing these operational sequence diagrams does not have any experience with the tasks The information provided on these tasks is limited in respect to the purpose of the assignment Microsoft Visio was used to complete the diagrams Summary
The operational sequence diagrams were completed for 3 tasks o Task 1. Change speed from 100 to 50 rpm, and change course from 90 to 270 degrees manually A partitioned OSD was used to diagram this task o Task 2. Increase speed to 75 rpm, dive to 100 feet, change course to 90/0 in auto A temporal OSD was used to diagram this task o Task 3. Reduce speed to 20 rpm, come to 50 feet, in auto A spatial OSD was used to diagram this task The partitioned OSD seems to reveal the most information about sequence of operations o This type of OSD allows a reader to see how different operations in the task process influence one another Temporal OSD does seem to provide some helpful information regarding possible lags Spatial OSD does not seem to be very useful, at least for this assignment o Link analysis seems like a more appropriate tool to use when attempting to determine spatial relationships
external input (command)
Provides orders to speed at 50 rpm and orient to 270 degrees
Indicates decision
Task 1
1324. OSD Assignment
supervisor
Helmsman speed tasks
Indicates process
engine room
Helmsman directional tasks
External output
Do we need to change speed Monitor speed On RPM gauge
No Yes Provide speed change orders
Initiate speed control changes
Continue with current speed
Problem with speed changes (feedback)
No Find solution to problem Continue with speed changes
Yes Confirm correct speed
Monitor speed on RPM gauge
Do we need to change course
Monitor course on compass Continue with current course No
Yes Provide course change orders
Confirm correct course
Initiate course control changes
Monitor course on compass
Continue with course changes
Task 2 Time Line Sheet 1.0-3.0 Tasks
Increase speed to 75 rpm, dive to 100 feet, change course to 90/0 in auto Time (in seconds) 5 10 15 20
0. Receives orders from command to increase speed to 75 rpm, dive to 100 feet, and change course to 90/0 1.1 Supervisor gives orders to helmsman regarding speed change 1.2 Helmsman sets RPM order setting to 75 rpm 1.3 Engine room responds to speed changes 1.4 Helmsman monitors RPM gauge 1.5 Helmsman informs supervisor when new speed has been reached 1.6 Supervisor confirms new speed
2.1 Supervisor gives orders to planesman regarding depth change 2.2. Planesman sets autodepth setting to 100 feet 2.3. Planesman monitors depth gauge 2.4 Planesman informs supervisor when new depth has been reached 2.5 Supervisor confirms new depth
3.1 Supervisor gives orders to helmsman regarding directional change 3.2 Helmsman sets bearing setting to 90/ 0 3.3 Helsman monitors compass repeater indicator 3.4 Helmsman informs supervisor when new course has been reached 3.5 Supervisor confirms new course heading
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Spatial OSD Helmsman speed control Task 3
Operator
Orders received on display from supervisor to reduce speed to 20 rpm Operator/supervisor command terminal
Information inputted and sent to engine room
RPM order setting module
Receive feedback from engine room Sufficient fuel
Temperature adequate
Sufficient personnel
Helmsman informs supervisor of new speed through command terminal
Helmsman monitors gauge RPM gauge
Operator
Spatial OSD Planesman depth control Task 3 Orders received on display from supervisor indicating to come to 50 feet depth Operator/supervisor command terminal
Informatio n inputted and sent to engine room
Depth setting indicator
planesman monitors gauge Planesman informs supervisor of new depth through command terminal
Depth gauge