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add observables feature to circuit battery model #86

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add observables feature to circuit battery model #86

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9aaac44
observables feature placeholder
lizjhale Jul 29, 2021
ac8bcc0
add observables placeholder
lizjhale Jul 29, 2021
2d19789
Update battery_electrochem.py
lizjhale Jul 30, 2021
ff27266
Merge branch 'dev' into feature/circuit_battery_obs
teubert Jul 30, 2021
de54ec9
Merge branch 'dev' into feature/circuit_battery_obs
wlamberson1 Aug 7, 2021
224cd5c
Merge remote-tracking branch 'origin/dev' into feature/circuit_batter…
teubert Oct 4, 2021
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11 changes: 11 additions & 0 deletions src/prog_models/models/battery_circuit.py
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Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,7 @@ class BatteryCircuit(prognostics_model.PrognosticsModel):
inputs = ['i']
states = ['tb', 'qb', 'qcp', 'qcs']
outputs = ['t', 'v']
observables_keys = ['currentMin', 'currentMax']

default_parameters = { # Set to defaults
'V0': 4.183,
Expand Down Expand Up @@ -181,3 +182,13 @@ def threshold_met(self, x):
return {
'EOD': V < parameters['VEOD']
}

def observables(self, x) -> dict:
params = self.parameters
nomCapacity = params['nomCapacity']
CRateMin = params['CRateMin']
CRateMax = params['CRateMax']
return {
'currentMin': nomCapacity * CRateMin,
'currentMax': nomCapacity * CRateMax,
}
20 changes: 19 additions & 1 deletion src/prog_models/models/battery_electrochem.py
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Expand Up @@ -160,10 +160,14 @@ class BatteryElectroChemEOD(PrognosticsModel):
| An : Redlich-Kister parameters (- electrode)
| VEOD : End of Discharge Voltage Threshold
| x0 : Initial state
| nomCapacity : Nominal capacity (Ah)
| CRateMin : Minimum C rate
| CRateMax : Maximum C rate
"""
events = ['EOD']
inputs = ['i']
states = ['tb', 'Vo', 'Vsn', 'Vsp', 'qnB', 'qnS', 'qpB', 'qpS']
observables_keys = ['currentMin', 'currentMax']
outputs = ['t', 'v']

default_parameters = { # Set to defaults
Expand Down Expand Up @@ -208,7 +212,12 @@ class BatteryElectroChemEOD(PrognosticsModel):

# End of discharge voltage threshold
'VEOD': 3.0,
'VDropoff': 0.1 # Voltage above EOD after which voltage will be considered in SOC calculation
'VDropoff': 0.1, # Voltage above EOD after which voltage will be considered in SOC calculation
# current ratings
'nomCapacity': 2.2, # nominal capacity, Ah
'CRateMin': 0.7, # current necessary for cruise,
'CRateMax': 2.5 # current necessary for hover
# CRateMin, CRateMax based on values determined in `C. Silva and W. Johnson, "VTOL Urban Air Mobility Concept Vehicles for Technology Development" Aviation and Aeronautics Forum (Aviation 2018),June 2018. https://arc.aiaa.org/doi/abs/10.2514/6.2018-3847`
}

state_limits = {
Expand Down Expand Up @@ -298,6 +307,15 @@ def event_state(self, x):
'EOD': min(charge_EOD, voltage_EOD)
}

def observables(self, x) -> dict:
params = self.parameters
nomCapacity = params['nomCapacity']
CRateMin = params['CRateMin']
CRateMax = params['CRateMax']
return {
'currentMin': nomCapacity * CRateMin,
'currentMax': nomCapacity * CRateMax,
}
def output(self, x):
params = self.parameters
An = params['An']
Expand Down