Work Machine Safety Evaluation Using Risk Duration Index
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Solution Overview
Problem
Existing safety evaluation systems for work machines cannot accurately assess safety based solely on the number of obstacle detections, as the duration of risk exposure significantly impacts the magnitude of the risk, leading to inadequate evaluation.
Innovation Solution
A safety evaluation system that includes a risk detection unit, a time calculation unit to measure the risk duration from occurrence to elimination, and an evaluation unit to calculate a safety index, allowing for a more comprehensive assessment of work machine safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If safety evaluation is based solely on the number of obstacle detections, then the evaluation system is simple, but the evaluation accuracy is insufficient because it does not account for risk duration
Solution Approach 1:
The safety evaluation is segmented into multiple components: obstacle detection count, risk duration measurement, and composite index calculation. The risk duration is further segmented into detection time points and duration intervals, allowing for more precise evaluation without requiring complete system redesign
Solution Approach 2:
The evaluation system transitions from one-dimensional (detection count only) to two-dimensional evaluation by adding the time dimension. The risk duration represents a new dimensional parameter that complements the detection frequency, enabling comprehensive safety assessment through multi-dimensional data integration
2Reliability
If the system only counts detection frequency, then data collection is simple, but the risk magnitude cannot be properly assessed because duration information is missing
Solution Approach 1:
The system performs preliminary recording of risk detection time points and calculates risk durations before final safety evaluation. By pre-processing and storing temporal information during operation, the system ensures that duration data is readily available when safety assessment is needed, preventing information loss
Solution Approach 2:
The system continuously monitors and records risk detection events with time stamps, providing feedback on both frequency and duration. This feedback mechanism ensures that temporal information is captured and fed into the evaluation model, preventing loss of critical risk characterization data
Data Source
AI summary
A risk detection unit detects an occurrence risk of an incident related to a work machine. A time calculation unit measures a risk time from an occurrence time of the risk to an elimination time of the risk. An evaluation unit calculates a safety evaluation index on the basis of the risk time. An output unit outputs the safety evaluation index.