Predtetschenski & Milinski now available in crowd:it!
As part of the verification process, we have implemented another method in crowd:it — a dynamic flow model. This model allows for approximate calculation of evacuation times and identification of congestion points.
The Predtetschenski & Milinski method is a widely recognized calculation approach that provides a rough estimate and is used to verify computer simulations (individual models) in fire protection verification.
Thanks to crowd:it’s intuitive user interface, creating such a calculation is very simple:
You can import background images to load a dimensioned floor plan and scale it to size. With just a few clicks, path elements can be created and combined into routes.
With a single click, results such as evacuation time, number of people in congestion, or delay time are available for further interpretation and can be exported as images or raw data for further use.
Permitted methods according to DIN 18009-2
DIN 18009-2 lists various methods approved for verification..
Microscopic methods represent each person individually, whereas macroscopic methods consider pedestrian flows in aggregate. Macroscopic calculation methods help perform quick estimates of evacuation time for a scenario without needing to model the geometry in detail. Microscopic simulations enable more detailed assessments of a given scenario.
The following table shows both representation features and analysis capabilities.
Representation features:
macroscopic
models
microscopic
Analysis possibilities:
macroscopic
models
microscopic
Details on the Predtetschenski & Milinski method
In general, each macroscopic method works as follows:
- Different movement directions (horizontal and vertical) as well as different path elements (stairs, narrowings, corridors) are considered.
- Calculations can include different groups of people (youth & adults) and densities (different clothing).
- The area under consideration is divided into so-called path elements.
- For each path element, properties such as flow rate, speeds, and times are calculated.
- By linking the path elements based on different calculation models, an overall evacuation time is determined.
More details, including a small calculation example, can be found here (in german).