Parameters
Parameters
Parameters are measurable values that describe how a system should perform. This page outlines a range of potential parameters that might be a measureable outcome of your system.
Warning
Parameters are NOT:
“Safe”
“Efficient”
“Easy to use”
“Reliable”
“Looks good”
You parameter must have a measureable number attached to it.
How many do I need?
There is no defined number of parameters that you need for your SAT. You should have enough to justify that your system solves the problem, meets the ethical considerations you have identified, and meets the factors that have influenced the design of the system.
Aim for 4 to 6 parameters that are directly tied to system function and ethics.
Aim to include another 1 or 2 for safety parameters.
- Performance parameters
- Accuracy (% error, tolerance range)
- Speed / response time (s, ms)
- Force / torque (N, Nm)
- Temperature range (°C)
- Load capacity (kg)
- Output power (W)
- Resolution (steps, degrees, increments)
- Input parameters
- Input voltage / current (V, A)
- Input force (N)
- Sensor range (lux, °C, cm, dB)
- Button press duration (ms)
- Signal frequency (Hz)
- Output parameters
- Output voltage / current (V, A)
- Motor speed (RPM)
- Actuator displacement (mm)
- Light intensity (lux)
- Sound level (dB)
- Mechanical movement range (degrees)
- Control & feedback parameters
- Setpoint value
- Deviation from setpoint
- Overshoot / undershoot
- Stability time
- Oscillation frequency
- Control delay
- Trigger threshold
- Efficiency & resource parameters
- Energy consumption (J, Wh)
- Efficiency (%)
- Heat loss (°C increase)
- Idle vs active power draw
- Duty cycle (% on/off time)
- Reliability & consistency parameters
- Failure rate
- Number of successful cycles
- Mean time between failures (MTBF)
- Repeatability (variation between trials)
- Drift over time
- Safety parameters
- Maximum safe temperature
- Maximum current draw
- Stall current
- Safe operating range
- Emergency stop response time
- Compliance thresholds (standards)
- User interaction parameters
- Response time to user input
- Required input force
- Error rate from users
- Accessibility limits (reach, visibility)
- Feedback clarity (time to confirmation)
- Environmental parameters
- Energy use per cycle
- Noise output (dB)
- Waste produced (g)
- Operating temperature range
- Environmental exposure tolerance (dust, moisture)
- Quality & durability parameters
- Wear rate
- Surface temperature after use
- Number of cycles before degradation
- Structural deformation (mm)
- Fastener loosening after use
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