Xija - defining model

xija_define.py

import xija

# Create Xija model named "dpa" (Digital Processor Assembly)
mdl = xija.ThermalModel('dpa')

# Add node for DPA temperature 1DPAMZT in telemetry
dpamzt = mdl.add(xija.Node, '1dpamzt')

simz = mdl.add(xija.SimZ) # Science Instrument Module posn
pitch = mdl.add(xija.Pitch) # Sun angle w/r/t spacecraft
eclipse = mdl.add(xija.Eclipse) # Eclipse status

# Solar heating of the DPA electronics box
mdl.add(xija.DpaSolarHeat, dpamzt, pitch_comp=pitch,
        simz_comp=simz, eclipse_comp=eclipse)

# External heat sink (cooling to rest of spacecraft and space)
mdl.add(xija.HeatSinkRef, dpamzt)

# Self-heating of DPA electronics due to internal power draw
mdl.add(xija.AcisDpaStatePower, dpamzt)

# Nearby thermostatically controlled proportional heater
mdl.add(xija.PropHeater, dpamzt)

# After all model components are defined then do a final
# "make" step to create arrays and read data as needed.
mdl.make()

# Write the model to a JSON file for use in fitting
mdl.write('dpa_model_spec.json')