Put everything in the UW orbital FMEA Spreadsheet as well (https://docs.google.com/spreadsheets/d/1HXKbXskj5TnBeDjVg0VAIt9JYc2V_OU_VXXN9zo_Tto/edit#gid=589520811)
https://drive.google.com/file/d/1y10zV6jmWYmp0U_AIgdWFCLCG26iBUiD/view
https://sites.google.com/site/manitobasat1/subsystems/aodcs?authuser=0
Steps:
Severity Scale
| Rating | Effect | Description |
|---|---|---|
| 5 | Very Bad | Catastrophic, imminent mission failure |
| 4 | Major | Serious permanent capacity damage |
| 3 | Moderate | Potential permanent damage |
| 2 | Minor | Temporary, difficult to correct error |
| 1 | Low | Temporary, easily correctable error |
Occurrence Scale
| Rating | Effect | Failure Rate |
|---|---|---|
| 5 | Lots | Once a minute or less |
| 4 | Frequent | Hourly |
| 3 | Sometimes | Daily |
| 2 | Occasional | Weekly |
| 1 | Very rare | Could happen once a mission |
Detection Scale
| Rating | Effect | Description |
|---|---|---|
| 5 | No chance that it will be detected | |
| 4 | ||
| 3 | ||
| 2 | ||
| 1 | Easily detectable, features planned or in place to find such an error |
Failure Modes
| Failure | Function | Severity Rating | Detection Rating | Occurrence Rating | Mitigation |
|---|---|---|---|---|---|
| Battery failure | Charge/Discharge issues (MPPT circuit fails, etc.) | 10 | |||
| Battery failure | Insufficient charge capacity due to battery degradation | 8 | 3 | ||
| Battery failure | Mechanical failure (disconnection, etc.) | 3 | |||
| Battery failure | Launch killswitch fails to disengage | 10 | 1 | 1 | |
| MPPT failure | MPPT failure | 7 | |||
| MPPT failure | Diode O-ring circuit failure | 8 | |||
| Battery heater failure | Battery | 8 | 3 | ||
| Solar Panel failure | Not getting enough sunlight because of poor orientation | 7 | 3 | ||
| Solar panel failure | Solar panels degrade | 8 | 2 | ||
| Power control/regulation | EPS MCU failure | ||||
| Power control/regulation | CDH MCU failure | 9 | |||
| Power control/regulation | Thermal circuit degradation | ||||
| Power control/regulation | Mechanical circuit degradation (wire comes loose, solder failure, PC104 header failure) | 8 | 3 | Lots of quality control | |
| Power control/regulation | Power converter failure (DC-DC, buck-boost converters | 7 | |||
| Power control/regulation | Power regulator failure (incorrect voltage on rails) | 7 | |||
| Power control/regulation | Power amplifier failure | ||||
| Power control/regulation | ESD issues | ||||
| Power control/regulation/distribution | Radiation shielding failure | ||||
| Power control/regulation | Power transfer failure (wires) | ||||
| Power control/regulation | Short/Open circuit | ||||
| Power distribution | Protection circuit failure | ||||
| Power distribution | Load switch circuit failure | ||||
| Power distribution | CDH-EPS communication failure (no data) | ||||
| Voltage spikes | Single upset events | ||||
| General Circuit Degradation | Total Ionizing Dose | 6 |