This chapters describes the system of interest at the first
decomposition level. That is, it describes 2 components which play a
role within the environment in which the system of interest must operate
and the (functional) interactions between those components. In Figure
the associated design-structure-matrix (DSM) is shown. The DSM shows the
dependencies between the elements that are relevant to this
decomposition level.
component – function spec dependency
matrix of decomposition level 1.
2.1 Drive-mechanism
This section describes drive-mechanism.
Properties:
The following properties are specified for drive-mechanism:
drive-length
2.1.1 Goal function
requirements
provide-torque |
Drive-mechanism must provide torque to
pump. |
2.1.2 Transformation function
requirements
drive-mechanism →
convert-power-potential |
Drive-mechanism must convert
power-potential into torque. |
Drive-mechanism is composed of the following sub-components:
motor
power-source
power-switch
2.2 Pump
This section describes pump.
Comments
Can be sourced by manufacturer XYZ. Part number CFG.PMP.0.1
Properties:
The following properties are specified for pump:
pump-length
2.2.1 Transformation function
requirements
pump → convert-torque
|
Pump must convert torque into water-flow.
|
2.2.2 Quantitative design
requirements
min-water-flow |
Water-flow must be at least 1.0 [L/s].
|
2.2.3 Quantitative design
constraints
dc-drive-length |
Drive-length must be equal to pump-length
. |
3 System specification
decomposition level 2
This chapters describes the system of interest at decomposition level
2 and introduces 3 additional components. In Figure the associated
design-structure-matrix (DSM) is shown. The DSM shows the dependencies
between the elements that are relevant to this decomposition level.
component – function spec dependency
matrix of decomposition level 2.
3.1 Power-source
This section describes power-source. This component
is a sub-component of drive-mechanism.
Power-source does convert power-potential
into power. |
3.1.3 Behavior requirements
drive-mechanism →
toggle-power |
Case on: | | when: | | *
motor-control-signal is equal to True [-] | | |
then: | | * power must be at least 300 [W] | | Case
default: | | when no other case applies, then: | | * power must
be equal to 0 [W] | | |
