Particle Size Definition Class
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Navigation: PGMs ➔ Classes ➔ Particle Size Definition Class
| Global Pre-Defined Class Instances | SysCAD Pre-Defined Classes | |||||||
|---|---|---|---|---|---|---|---|---|
| Sp Database SDB Class | Particle Size Defn PSD Class | Plant Model PM Class | Array Class | StrArray Class | Matrix Class | TagSelect Class | Time Class | Noise Class |
Latest SysCAD Version: 13 May 2026 - SysCAD Build 139.37082
Related Links: Defining a Class, Example PGM Files
Description
The name of the single global instance of the Particle Size Definition class is PSD and can be referenced directly.
The Particle Size Definition (PSD) class provides member functions for users to access the details of any size definitions within a project.
Data Members
None
Member Functions
The examples in the following table are all based upon a project containing the following:
- Species:
- H2O(g), H2O(l), Ore1(s), Ore2(s), Ore3(s)
- 1 Sieve Series Definition called 'Demo' with size intervals (in microns):
- 10, 20, 50 and 150.
- 2 individual species size distributions:
- 1st with Ore1, 2nd with Ore2, with Ore2 as the 'default' species. Therefore, Ore3 will have the same size distribution as Ore2.
| Call | Functionality | Return Type | Parameters | Example |
| Functions to return information about the overall Particle Size Distributions | ||||
| DistributionCount() | This returns the total number of Sieve Series defined in the project configuration. Normally this value is '1', but the user may define more than one Sieve Series. |
integer | None | NumberDist = PSD.DistributionCount() NumberDist = 1 |
| Name(DistIndex) | This returns the name of the Sieve Series, as defined in the Configuration file. | string | Distribution Index (normally = 0) |
DistName = PSD.Name(0) DistName = 'Demo' |
| IntervalCount(DistIndex) | This returns the total number of size intervals defined in the specified Sieve series. | integer | Distribution Index (normally = 0) |
NumIntervals = PSD.IntervalCount(0) NumIntervals = 4 |
| ParticleCountFactor() Available from Build 139.31216. |
This returns the correction factor defined in the configuration file which may be used to account for particle geometry. | real | None | CountFactor = PSD.ParticleCountFactor() CountFactor = 1 |
| Functions to return the information about the species in a Sieve Series Distribution | ||||
| SpeciesCount(DistIndex) | This returns the number of species in the specified Sieve series. | integer | Distribution Index (normally = 0) |
NumSpecies = PSD.SpeciesCount(0) NumSpecies = 3 |
| SpIndex(DistIndex, SizeDist) | This returns the species index of the primary species in the Size Distribution. | integer | Distribution Index Size Index |
SpeciesIndex1 = PSD.SpIndex(0, 0) SpeciesIndex1 = 3 |
| SpShortName(DistIndex, SizeDist) | This returns the species short name (symbol) of the primary species in the Size Distribution. | string | Distribution Index Size Index |
SpeciesName = PSD.SpShortName(0, 0) SpeciesName = Ore1 |
| Functions to return information about the Size Intervals in a specified Sieve Series Distribution | ||||
| SmallestSize(DistIndex) Available from Build 139.31216. |
This returns the smallest, or Bottom, size of the Sieve Series. | real | Distribution Index | SmallestSize = PSD.BottomSize(0) SmallestSize = 0.0005 |
| BottomSize(DistIndex, IntIndex) | This returns the smallest, or Bottom, size of the specified interval index. | real | Distribution Index Interval Index |
Bottom1 = PSD.BottomSize(0, 1) Bottom1 = 0.01 |
| TopSize(DistIndex, IntIndex) | This returns the largest, or Top, size of the specified interval index. | real | Distribution Index Interval Index |
Top1 = PSD.TopSize(0, 1) Top1 = 0.02 |
| GeomMean(DistIndex, IntIndex) | This returns the Geometric Mean of the specified interval index. | real | Distribution Index Interval Index |
GM1 = PSD.GeomMean(0, 1) GM1 = 0.01414 |
| ArithMean(DistIndex, IntIndex) | This returns the Arithmetic Mean of the specified interval index. | real | Distribution Index Interval Index |
AM1 = PSD.ArithMean(0, 1) AM1 = 0.015 |
| TopSizeArray(DistIndex, Array) Available from Build 139.31216. |
This populates the contents of an Array (resizing the Array if required) containing the Top Sizes for the Size Distribution. | Distribution Index Array: the name of the specified array. This is an Array Class. |
Array TopSizes PSD.TopSizeArray(0, TopSizes) | |
| GeomMeanArray(DistIndex, Array) Available from Build 139.31216. |
This populates the contents of an Array (resizing the Array if required) containing the Geometric Means for the Size Distribution. | Distribution Index Array: the name of the specified array. This is an Array Class. |
Array GeomMeans PSD.GeomMeanArray(0, GeomMeans) | |
Example
The following example uses the same configuration as in the above section. It sets the top and bottom size and geometric and arithmetic mean for all of the size intervals into arrays.
array Top, Bottom, GeometricMean, ArithmeticMean
integer NumIntervals, i
; Find the the number of size intervals and set the arrays to this length
NumIntervals = PSD.IntervalCount(0)
Top.SetLen(NumIntervals)
Bottom.SetLen(NumIntervals)
GeometricMean.SetLen(NumIntervals)
ArithmeticMean.SetLen(NumIntervals)
; Set the top and bottom size and geometric and arithmetic mean for all of the size intervals into the arrays
i = 0
while (i < NumIntervals)
Top.SetAt(i, PSD.TopSize(0, i))
Bottom.SetAt(i, PSD.BottomSize(0, i))
GeometricMean.SetAt(i, PSD.GeomMean(0, i))
ArithmeticMean.SetAt(i, PSD.ArithMean(0, i))
i = i + 1
endwhile
Size intervals can be retrieved directly into arrays.
array TopSizes, GeometricMean
PSD.TopSizeArray(0, TopSizes)
PSD.GeomMeanArray(0, GeometricMean)