3.2 CoDR Checklist Kareena Shah 14 Feb 2026
5.2 CoDR Checklist Sreeja Akula 14 Feb 2026
3.2 (Thermal Equalization) Thermal Strap Analysis Divya Krishna 14 Feb 2026
4.1 (Rotational Dynamics and Updated Torque Calcs) Izaan Rizvi @Colter Adrian Yang Elisha Aranibar 14 Feb 2026
4.1 (Tank and Propellant Pressure Analysis) Brandon Garcia @Rene 14 Feb 2026

3.2

-kareena

4.1 -

4.1 Design Book MCU Specs:

Frequency up to 480 Mhz
2 Mbytes of flash memory
1 Mbyte of RAM
3x 16-bit ADC
- STM32H753 VI →
  - Number of Direct channels - 3
  - Number of Fast channels - 2
  - Number of Slow channels -11
- STM32H753 ZI →
  - Number of Direct channels - 2
  - Number of Fast channels - 9
  - Number of Slow channels -17
- STM32H753 AI/STM32H753 II /STM32H753 BI →
  - Number of Direct channels - 2
  - Number of Fast channels - 9
  - Number of Slow channels -21
- STM32H753 XI →
  - Number of Direct channels - 4
  - Number of Fast channels - 9
  - Number of Slow channels -23
–40 to +85 °C temperature range from a 1.62 to 3.6 V power supply
4x I 2Cs– 4x USARTs, 4x UARTs and 1x LPUART
a high-resolution timer, 12 general-purpose 16-bit timers, two PWM timers for motor control, five low-power timers

Rigid-Body Rotational Dynamics (Tank Spin System):

Tank Specs:
Material → 304L Stainless Steel
Length → 15 cm
Radius → 4 cm
Thickness → 0.5 cm
Mass → 1.143 kg

Configuration:
Thin-walled cylindrical tank approximation
Instrumented with internal thermocouples
Sealed end-cap with wiring feedthrough

Moment of Inertia (Izz):
Izz = mR²
Izz = (1.143 kg)(0.04 m)²
Izz = 0.001829 kg·m²

Drive Torque:
τ = 0.840 N·m

Angular Acceleration:
τ = Iα → α = τ / I
α ≈ 459.4 rad/s²

Spin Rate Requirement:
2–3 RPM
ω ≈ 12.57 – 18.85 rad/s

Spin-Up Time:
t = ω / α
t ≈ 27 – 41 ms

Power Estimate:
P ≈ 6.5 W

Motor / Servo Notes:
Torque–speed curve limits max RPM
Servo must provide ≥ 0.84 N·m stall torque
Continuous power ≥ 6.5 W

Design Task:
Evaluate 4 candidate servos from electrical spreadsheet →
Compare torque, speed, power, and mass to select optimal model.

4.2

4.3

5.1

Sensor Inventory

The sensor suite must be finalized for CoDR and justified, including:

IMU (gyroscopes and accelerometers

ignore

Redundant rate sensing

2 pressure sensors

Tank temperature sensor array

Custom from WIKA

Pump RPM and motor current sensing

ignore

Pressure and vent-state sensing

ignore

5.2

For each sensor, Controls shall specify:

Update rate

Accuracy and noise

Drift characteristics

Survivability under spin

Electrical interface

5.3

Max Operating Temperatures of Components (C):
- Tank Servos: max coil temp → 130, continuous (preferable) operating temp → 90
- On Board Computer (OBC): -40 to 85 (assuming power supply 1.62V to 3.6V)
- Pressure Sensor: -40 to 125
- Watchdog timer circuit: -40 to 125
- Thermocouple to digital converter: -55 to 125
- RS-422 Transceiver Bus/Data: -65 to 150 (storage temperature), 150 max junction temperature, **highly recommended: -40 to 85
Thermal strap details: STCH_Thermal Straps_Submitted_Q2 2024.pdf

7.1 -

Failure Mode	Detection	Isolation / Safe Mode	Recovery
Sensor bias / dropout	Redundancy, out-of-range checks, rate checks, residuals	Flag sensor invalidity, use backup, and reduce authoriuty	Sensor reset → offset compensation where valid
Unexpected torque	Model vs measured residuals	Switch to damping mode, inhibit impulses	Let residuals decay and re-estimate states
Spin-axis misalignment	Orientation vs expected dynamics	Reduce authority, re-acquisition	Re-estimate axis and update control parameters
Partial power loss	Voltage / Current thresholds	Disable non-essential processes and maintain survival	Gradually restore functions as power stabilizes

FDIR = Continuously:

Observe system state
Compare to model/expectations
Flag anomalies
Enter a safe mode
Attempt recovery
Only return to nominal when consistent

3.2

4.1 -

4.2

4.3

5.1

5.2

5.3

7.1 -

Thermal Straps