en:doku:ppsearch [Gordons Reloading Tool Community]

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======Parametric powder search & generic tolerance synthesis======

This powerful tool consists of two parts, the **//Parametric Powder Search//** and the **//Generic Tolerance Synthesis//**. In combination, you can search for propellant powders based on your **current load file** in real time using various criteria and/or perform internal ballistic simulations with different propellant powders. Here you specify the tolerance ranges.

====Note====
**If you call this tool, the data of your current load file in the foreground will be used, e.g. the current powder is already preselected.**

=====Parametric Powder Search=====
{{ en:media::ppsearch-setup.png?35%&link}}
**Parametric Powder Search** is used to find propellant powders that have similarities to the currently selected powder within the specified tolerance ranges. This is comparable to the table for the relative burning rate, with the difference that you also have the possibility to select and set detailed tolerance windows for individual factors of a powder.

**If you click** on the button with the currently selected propellant powder, you can specify another powder as the base for the search.

**Use the button** above the sliders to select the maximum range of the tolerance window. Here you can specify whether the search should be carried out in both directions or only in the positive or negative range.

**The sliders** below can be used to set the tolerance windows of the respective values or factors individually. The result of the search is automatically displayed at the bottom of the list.

**For a similarity search the selection //"[x] Similarity search"// with the factor //"Brisance/Progressivity (Brp)"// is recommended.

**Note that "similar" propellant powders can exhibit completely different behavior. In this case, each of the selected powders would have to be tested individually for suitability, which means that the charge of each propellant powder would have to be adjusted accordingly, **but:**

**to simplify this work, there is the Generic Tolerance Synthesis.**

=====Generic Tolerance Synthesis=====
{{ en:media::ppsearch-synth-setup.png?35%&link}}
**Generic tolerance synthesis** performs internal ballistic simulations based on the selected powders and tolerance windows and uses recursive generic adaptation to determine the next possible charge to the selected powder depending on all set criteria **simultaneously!**

I.e. you define in which pressure range and/or e.g. muzzle velocity the charge should move and the synthesis calculates for all powders listed below the charge which best meets the criteria.

**Depending on the selection of the limiting tolerance windows and the selected propellant powders, the charges can exceed the specified maximum pressures, or represent no sensible charge or even a dangerous one!**

====Tolerance Window====
In order to perform the synthesis, certain tolerance windows must be specified. If an incomplete or incorrect input is detected, the corresponding input field is framed in red.

**If you do not enter a minimum value for the loading ratio**, this can **slow down the calculation considerably**, especially for long gun calibers, since the synthesis then has to pass through a larger powder range.
Keep in mind that many internal ballistic calculations are performed for each individual propellant powder.

If the maximum pressure tolerance window is selected and the limit of -15% or the maximum specified pressure is exceeded, the text is automatically highlighted.

**Above the list of propellants** you will find the buttons and functions to make your choice. Here you also have the possibility to add the propellants found with the //Parametric Powder Search// to the list.

====Start Synthesis====
{{ en:media::ppsearch-synth-progress.png?35%&link}}
**With a click on the button [Start synthesis]**, the generic tolerance synthesis is started. Now many individual internal ballistic calculations are performed for all powders selected in the list in conjunction with the desired tolerance parameters on the basis of their current charge with the specified case volume, projectile etc., the simulation results are set in relation to the specified tolerances and restarted with modified powder quantity. All this until as many criteria as possible have been met at the same time.

The results of each individual synthesis are then written to a list in the Results tab (see picture on the right) and the current calculation is displayed graphically in real time during the process. 

After completion, you can click on an entry to display a short preview of the results above. By clicking on the small diagram image of a list entry, the complete result diagram is displayed. Detailed warnings can be found as usual in the diagram screen and also in the results list after the export.

====Load/save configuration====
**You can save and load the configuration** of your current settings with the corresponding functions from the menu. In combination with your load file (*.grtload) you can restore and restart the synthesis later using the stored parameters.

====Result export====
**To export the results** you can select the export formats Text, HTML and Image from the menu, where **HTML** contains a complete result list, **including all diagram images**. The graphics are stored in the HTML document itself, i.e. it is only a single file which you can share.

===Export as Text===
{{en:media::ppsearch-synth-result-txt.png?300&link}}

===Export as HTML===
{{en:media::ppsearch-synth-result-html.png?300&link}}{{en:media::ppsearch-synth-result-html-dia.png?300&link}}