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Software Architecture Analysis and Design
You have been tasked to develop the architecture for a mine pump
control system, designed to monitor and pump flood water out of mine
shafts. As underground mining operations take place far below the
water table, flooding into mine galleries and shafts is an ever-present
danger. Excessive flooding is clearly a safety hazard for workers, but
also has profitability implications ranging from equipment damage to
productivity delays, to mine closures in extreme circumstances.
The system to be developed will be required to monitor the water level
in a given mine shaft using two sensors. A high water sensor that
measures the maximum acceptable level of flooding in a shaft before
pumping begins, and a low water sensor, which measures the
minimum level of acceptable flooding and pumping stops. These
sensors are used to start a mine pump. When the flooding level
exceeds the level determined by the high water sensor the pump is
switches on. When the water has been pumped out and the minimum
level of acceptable flooding has been reached, as measured by the low
water sensor, the pump switches of.
In addition to flooding mining is often hindered by methane pockets,
where gas seeps into the shafts and galleries triggering an evacuation.
Again this is a safety hazard, the mining staff won?t be able to breathe,
and even more critically, operating equipment may generate sparks
which will cause the methane to ignite. Therefore the system will
include a methane sensor that will be used to trigger an evacuation
alarm in the presence of dangerous levels of methane (measured in N
parts per million), and also switch of the pump regardless of the
current water level.
The system is used by two key roles. The first is the Operator. This
role is required to log in to the system with a username and password.
Following a successful login the operator is able to start or stop the
pump if, and only if, the water level is between the high and low sensor
limits. The second role is the Supervisor. A supervisor must verify
their security credential as per the operator above. Following a
successful login they are able to switch the pump on, or off at any
time. For example a supervisor could run the pump after the flood
level has dropped below the level set by the low water sensor. They
could also switch the pump off if the water level goes over the
maximum high level of flooding. In these cases the supervisors? actions override the automatic behavior of the pump. A supervisor is
required to ?reset? the pump system in order to re-establish automatic
Finally to meet Federal monitoring standards a persistent log is
required to capture the following events: Pump switched on by high water sensor
Pump switched off by low water sensor
Pump switched on or off by operator or supervisor
Evacuation alarm triggered by methane sensor
The reading of the methane sensor every 30 minutes The reading of the methane sensor (for the last 24 hours) can be read
by the operator. All readings (up to 30 days) can be read by the
supervisor. The supervisor also has the capability to add a ?note? to
any specific log event that occurs within 24 hours.
Your task is to document the software Architecture of this system.
You may use ANY development technique that you would like. Provide
your complete design of this system as described above.
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Sep 13, 2020EXPERT
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