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Description Class NoMalfunctionSensor
INTENTION
This class provides all definitions to describe the behavior of a sensor if it has no malfunction.
It is distinguished between three values:
- the value of the phenomenon existing in the real world (which can never be visible for the machine) (timed function envEntity),
- the analogously measured value of this real world value (timed function measuredEntity), and
- the digitally measured value which is a conversion of the analog measured value (timed function convertedEntity).
Note that this class can be used to describe a sensor that already exists in the environment. This is expressed as follows: At first the value measured by the sensor, namely convertedEntity, has the scope environment controlled, not visible for the machine. Secondly, the properties
and
describing the behavior of the sensor are characterized as domain knowledge. Otherwise, if the sensor does not exist, they have to be requirements.
FORMAL PARAMETERS
Intention |
: |
This domain contains the possible values of the measured phenomenon existing in the real world. |
Intention |
: |
This domain contains the possible analogously measured values. |
Intention |
: |
This domain contains the possible digitally converted measured values. |
SIGNATURE
Time Constant |
reactionTime |
Intention |
: |
This time constant represents the reaction time of the sensor. The reaction time is the time between a change of the value in the real world (envEntity) and the time point the measured entity (measuredEntity) has reached 90 percent of the change. |
Scope |
: |
ev |
Time Constant |
conversionTime |
Intention |
: |
This time constant represents the conversion time of the sensor. The conversion time is the time needed to convert an analogously measured value (measuredEntity) into the corresponding digital value (convertedEntity). |
Scope |
: |
ev |
Intention |
: |
This function represents the value of the measured phenomenon in the real world.
Note that this function represents the phenomenon as it is in the real world and not how it is seen by the machine. |
Scope |
: |
eh |
Intention |
: |
This function represents the analogously measured value of the phenomenon existing in the real world. |
Scope |
: |
eh |
Intention |
: |
This function represents the digitally converted value of the measured value. |
Scope |
: |
ev |
Intention |
: |
This function represents the way in which a value of the phenomenon in the real world (envEntity) is modified during the reaction of the sensor resulting in an analogously measured value measuredEntity. |
Scope |
: |
eh |
Intention |
: |
This function represents the way in which an analogously measured value measuredEntity is modified during the conversion into a digital value (convertedEntity). |
Scope |
: |
eh |
DOMAIN KNOWLEDGE
Formal |
: |
( ( envEntity reactionTime modifyReaction measuredEntity) ) |
NL |
: |
The analogously measured value is always derived from the value of the phenomenon in the real world using the function modifyReaction. A change of the value in the real world is always propagated within the time reactionTime. |
Formal |
: |
( ( measuredEntity conversionTime modifyConversion convertedEntity) ) |
NL |
: |
The digitally converted value is always derived from the analogously measured value using the function modifyConversion. A change of the value in the real world is always propagated within the time conversionTime. |
Next: Description Class MalfunctionSensor
Up: No Title
Previous: Group Sensors
Forest-System
1999-06-10