forked from RnD/rotatingMachine
67 lines
3.4 KiB
Markdown
67 lines
3.4 KiB
Markdown
# rotating machine
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---Explanation KPIs---
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Mean Time Between Failures: MTBF is a key indicator of asset reliability. It represents the average amount of time between two consecutive failures during normal operation. The higher the value, the better.
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- Formula: MTBF = runtime / failures
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Mean Time to Repair: MTTR focuses on the speed of failure recovery. It indicates how long it takes on average to repair a failure and restore the system to operational condition. The lower the value, the better.
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- Formula: MTTR = maintenance_time / failures
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Asset Availability: Asset availability indicates how often machines are available for use. Higher availability means that the equipment experiences fewer breakdowns and remains operational for a greater amount of time.
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- Formula: availability = MTBF / (MTBF + MTTR) * 100%
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Asset Health Index: A score ranging from 0 (optimal condition) to 5 (worst case) that reflects the overall health status of an asset.
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How Asset Health Index is being calculated:
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1. Hard rule first: If the machine state is "maintenance", the health index is set straight to 5 (worst).
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2. Otherwise it uses 3 inputs:
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Unavailability = 1 - availability
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If the machine is often down (low availability), this gets higher → worse health.
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Drift score = how much measured vs. predicted pressure/flow/power differ over time.
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More mismatch → higher drift score → worse health.
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Efficiency penalty = how far the current efficiency is from the best efficiency point.
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Further from the peak efficiency → higher penalty → worse health.
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3. These are combined into one score:
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score01 = 0.2 * unavailability
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+ 0.4 * driftScore
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+ 0.4 * effPenalty;
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So: availability (20%) + drift (40%) + efficiency loss (40%).
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4. Convert to index 0–5:
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index = round(score01 * 5)
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Clamp between 0 and 5 and store in this.assetHealth.index.
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Summary: Health index = mix of downtime, sensor/prediction mismatch, and efficiency loss, scaled to a 0–5 scale (0 good, 5 bad).
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Remaining Useful Life: the estimated amount of time an asset has until it becomes unusable or requires replacement.
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How RUL is being calculated: combination of MTBF and Asset Health Index
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---KPI message---
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The message consists of the following components:
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- asset tagnumber: unique identifier of an asset
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- Maintenance mode: If asset in maintenance, this returns true, else this return false
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- Maintenance Time: Total time the asset has been in maintenance
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- asset availability
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- mean time between failures
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- mean time to repair
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- asset health index
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- asset health color: Gives a color based on the asset health index (0 = Darkgreen, 1 = Green, 2 = Yellow, 3 = Orange, 4 = Red, 5 = Darkred.)
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- total failures: the total number of failures that have occured for a particular asset
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- Remaining Useful Life: the length from the current time to the end of the useful life
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Example message:
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{
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asset_tag_number: "L001"
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maintenance_mode: false
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maintenance_time: 0.23494861111111115
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kpi_asset_availability: 95.83
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kpi_mtbf: 1.3505209027777778
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kpi_mttr: 0.05873715277777779
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kpi_asset_health_index: 2
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kpi_asset_health_color: "#FFFF00"
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kpi_total_failures: 4
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remaining_useful_life: 1.0804167222222223
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} |