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MORM--a Petri net based model for assessing OH&S risks in industrial processes: modeling qualitative aspects
David Vernez1, Didier R Buchs, Guillaume E Pierrehumbert
1Institute of Occupational Health Sciences IST, Lausanne, Switzerland. david.vernez@inst.hospvd.ch
Summary
Complex workplaces require advanced risk assessment. The MORM model, using object-oriented Petri nets, offers a dynamic, multi-oriented approach for improved occupational health and safety analysis.
Area of Science:
- Occupational Health and Safety (OH&S)
- Industrial Risk Management
- System Dynamics Modeling
Background:
- Increasing workplace automation and process diversification create complex systems.
- Classical hazard assessment methods (checklists, sequence models) are insufficient for complex environments.
- Single-oriented methods (AEA, FMEA, HAZOP) fail to address the multifaceted nature of workplace risks.
Purpose of the Study:
- To introduce and discuss the qualitative modeling aspects of the Man-Machine Occupational Risk Modeling (MORM) model.
- To present MORM as a dynamic, multiple-oriented alternative for workplace risk analysis.
- To demonstrate the application of MORM within an Occupational Health and Safety (OH&S) perspective using a specific tool.
Main Methods:
- Utilized the CO-OPN (Computerized Object-Oriented Petri Net) tool for qualitative modeling.
- Modeled industrial processes as interconnected subnets representing machines and their state spaces.
- Integrated man-machine interactions as triggering events, informed by the CREAM cognitive behavior model.
- Employed object-oriented Petri nets with data types and measure constraints for simulating machine states and interconnections.
Main Results:
- Developed a dynamic model (MORM) capable of simulating and analyzing industrial processes from an OH&S viewpoint.
- Demonstrated how machine interconnections and flow properties explicitly introduce process-related factors.
- Showcased the construction of constraint enrichment hierarchies for optimized simulation and analysis within a mathematical framework.
Conclusions:
- The MORM model, leveraging Petri nets, enables multiple-oriented risk analysis, overcoming limitations of traditional methods.
- This approach can significantly reduce the time required for risk assessment processes.
- It opens new possibilities for risk comparison, integrated risk management, and modeling diverse systems due to its generic nature.
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