Publishing Fitted and Analytical Models

To publish the results of a simulation diagram as a model, you must first fit a distribution to the simulation results. The published model will always be based on the fitted distribution. For an analytical diagram, however, you can publish models based on the analytical solution and/or the fitted distribution.

• An analytical model is based on the analytical solution. This is essentially a single reliability model object that references all items in the diagram, as well as their dependents. Each reference to a model like this is really a reference to the diagram and its subdiagrams, and uses resources accordingly. The benefit to this approach is that no approximation is needed and any changes made to the models or dependencies of the blocks within it will be automatically incorporated in the model. The drawback is that such models are complex and consume computer memory and resources.
• A fitted model is based on the fitted distribution, and yields an approximation of the entire diagram (and its subdiagrams). This results in a significant reduction of complexity, as the entire diagram and its dependents no longer need to be used for any calculations. The drawback is that any changes that are subsequently made to the diagram and/or its dependents are not reflected unless the distribution is refitted and then republished.

Each type of model has its own area, with all associated tools for publishing the model and viewing its properties, on the Publishing page of the analytical diagram control panel.

Removing Associations for Analytical Models

For all published models, you can remove the association between the current analysis and the published model by clicking the Remove Association icon.

When you do this, the model will continue to be a resource in the database but it can no longer be synchronized with the original analysis. However, in the case of a published analytical model, removing the association with the diagram would actually remove the model itself, because it is a direct reference to the diagram. Therefore, to remove the association for published analytical models, you must specify a replacement model. If a fitted model exists for the diagram, it will be used as the replacement. If no fitted model exists, you will be prompted to specify the properties for a replacement model.

Similarly, if you delete an analytical diagram with a published analytical model, you must specify a replacement model. In this case, a fitted model must not only exist but also have been published in order to be used as the replacement. If no fitted model has been published, you will be prompted to specify the properties for a replacement model.