A RAM model presents a clear picture of functional interdependencies and provides a framework for developing quantitative product level RAM estimates to guide the design trade-off process. RAM models are derived from and traceable to system functional requirements. They may take inputs from comparative analysis, RAM predictions, test data, field data, as well as customer requirements and usage profiles.
Models may be relatively simple or go into great detail by taking into account duty cycles, service life limitations, wearout items, different environments, human error, and/or software. The scope of the model usually depends on the type and amount of information available and the criticality of the system under consideration.
RAM Modeling Features
- Analytical or simulation based.
- Linked to system functional requirements.
- Presents a clear picture of functional interdependencies.
RAM Modeling Uses
- Allows summarizing all factors affecting system RAM.
- Making numerical allocations and assessments.
- Easy identification of single points of failure.
- Evaluating complex, redundant configurations.
- Showing all series-parallel and other topological relationships.