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Get Mass Properties of Multibody Assembly Component Example (VB.NET)

This example shows how to get the mass properties of a multibody assembly component in which an assembly cut-extrude feature is created.

NOTES:

  • An assembly component, i.e., a part or subassembly, can contain one or more assembly-level features. Some types of assembly features, e.g., cut extrude, can affect the mass properties. Assembly features are not present in the part or subassembly.

  • Mass property values returned are relative to the component origin, not the assembly origin.

'---------------------------------------------------------------
' Preconditions:
' 1. Verify that the specified multibody part document
'    and assembly document template exist.
' 2. Open the Immediate window.
'
' Postconditions:
' 1. Opens the specified multibody part document.
' 2. Creates an assembly using the specified multibody
'    part document.
' 3. Creates an assembly cut-extrude feature.
' 4. Selects the multibody component.
' 5. Gets the mass property values of the multibody
'    component.
' 6. Examine the Immediate window.
'
' NOTE: Because the part is used elsewhere, do not save changes.
'----------------------------------------------------------------
Imports SolidWorks.Interop.sldworks
Imports SolidWorks.Interop.swconst
Imports System.Runtime.InteropServices
Imports System
Imports System.Diagnostics
 
Partial Class SolidWorksMacro
 
    Public Sub main()
 
        Dim swModel As ModelDoc2
        Dim swDocExt As ModelDocExtension
        Dim swAssembly As AssemblyDoc
        Dim swMass As MassProperty
        Dim swSelMgr As SelectionMgr
        Dim swComp As Component2
        Dim swSketchMgr As SketchManager
        Dim swSketchSegment As SketchSegment
        Dim swFeatMgr As FeatureManager
        Dim swFeat As Feature
        Dim vBodyArr As Object
        Dim vBodyInfo As Object = Nothing
        Dim vCoM() As Double
        Dim vMoI() As Double
        Dim vPrinAoIx() As Double
        Dim vPrinAoIy() As Double
        Dim vPrinAoIz() As Double
        Dim vPrinMoI() As Double
        Dim bRet As Boolean
        Dim errors As Integer
        Dim warnings As Integer
 
        'Open multibody part document and create an assembly
        swModel = swApp.OpenDoc6("C:\Program Files\SolidWorks Corp\SolidWorks\samples\tutorial\multibody\multi_inter.sldprt", swDocumentTypes_e.swDocPART, swOpenDocOptions_e.swOpenDocOptions_Silent, "", errors, warnings)
        swModel = swApp.NewDocument("C:\ProgramData\SolidWorks\SolidWorks 2016\templates\Assembly.asmdot", 0, 0, 0)
        swAssembly = swModel
        swComp = swAssembly.AddComponent5("C:\Program Files\SolidWorks Corp\SolidWorks\samples\tutorial\multibody\multi_inter.sldprt", swAddComponentConfigOptions_e.swAddComponentConfigOptions_CurrentSelectedConfig, "", False, "", -0.0000926777909171506, 0, 0.000048904806817518) 
        
        'Create an assembly cut-extrude feature
        swDocExt = swModel.Extension
        swSketchMgr = swModel.SketchManager
        swFeatMgr = swModel.FeatureManager
        bRet = swDocExt.SelectByID2("""FACE", -0.0195381300573558, 0.0449999999998454, -0.00303401890568011, False, 0, Nothing, 0)
        swModel.ClearSelection2(True)
        swSketchSegment = swSketchMgr.CreateCircle(0.0#, 0.0#, 0.0#, 0.002956, -0.004701, 0.0#)
        swModel.ClearSelection2(True)
        bRet = swDocExt.SelectByID2("Arc1""SKETCHSEGMENT", 0, 0, 0, False, 0, Nothing, 0)
        swFeat = swFeatMgr.FeatureCut3(TrueFalseFalse, 0, 0, 0.5, 0.00254, FalseFalseFalseFalse, 0.0174532925199433, 0.0174532925199433, FalseFalseFalseFalseFalseTrueTrueTrueTrueFalse, 0, 0, False)
        swSelMgr = swModel.SelectionManager
        swSelMgr.EnableContourSelection = False
 
        'Select multibody component
        bRet = swDocExt.SelectByID2("multi_inter-1@Assem1""COMPONENT", 0, 0, 0, False, 0, Nothing, 0)
 
        swMass = swDocExt.CreateMassProperty
        swComp = swSelMgr.GetSelectedObjectsComponent4(1, -1)
        vBodyArr = swComp.GetBodies3(swBodyType_e.swSolidBody, vBodyInfo)
        bRet = swMass.AddBodies((vBodyArr))
 
        'Get mass properties of selected component's bodies
        vCoM = swMass.CenterOfMass
        vMoI = swMass.GetMomentOfInertia(swMassPropertyMoment_e.swMassPropertyMomentAboutCenterOfMass)
        vPrinAoIx = swMass.PrincipleAxesOfInertia(0)
        vPrinAoIy = swMass.PrincipleAxesOfInertia(1)
        vPrinAoIz = swMass.PrincipleAxesOfInertia(2)
        vPrinMoI = swMass.PrincipleMomentsOfInertia
        Debug.Print("Component = " & swComp.Name2)
        Debug.Print("Configuration = " & swComp.ReferencedConfiguration)
        Debug.Print("Density = " & swMass.Density & " kg/m^3")
        Debug.Print("")
        Debug.Print("Center of mass = (" & vCoM(0) * 1000.0# & ", " & vCoM(1) * 1000.0# & ", " & vCoM(2) * 1000.0# & ") mm")
        Debug.Print("Volume = " & swMass.Volume * 1000000000.0# & " mm^3")
        Debug.Print("Area = " & swMass.SurfaceArea * 1000000.0# & " mm^2")
        Debug.Print("Mass = " & swMass.Mass & " kg")
        Debug.Print("Principle axes of inertia ")
        Debug.Print("  Ix = (" & vPrinAoIx(0) & ", " & vPrinAoIx(1) & ", " & vPrinAoIx(2) & ")")
        Debug.Print("  Iy = (" & vPrinAoIy(0) & ", " & vPrinAoIy(1) & ", " & vPrinAoIy(2) & ")")
        Debug.Print("  Iz = (" & vPrinAoIz(0) & ", " & vPrinAoIz(1) & ", " & vPrinAoIz(2) & ")")
        Debug.Print("Principle moments of inertia")
        Debug.Print("  Px = " & vPrinMoI(0) & " kg*m^2")
        Debug.Print("  Py = " & vPrinMoI(1) & " kg*m^2")
        Debug.Print("  Pz = " & vPrinMoI(2) & " kg*m^2")
        Debug.Print("Products of inerita")
        Debug.Print("  Lxx = " & vMoI(0) & " kg*m^2")
        Debug.Print("  Lxy = " & vMoI(1) & " kg*m^2")
        Debug.Print("  Lxz = " & vMoI(2) & " kg*m^2")
        Debug.Print("  Lyx = " & vMoI(3) & " kg*m^2")
        Debug.Print("  Lyy = " & vMoI(4) & " kg*m^2")
        Debug.Print("  Lyz = " & vMoI(5) & " kg*m^2")
        Debug.Print("  Lzx = " & vMoI(6) & " kg*m^2")
        Debug.Print("  Lzy = " & vMoI(7) & " kg*m^2")
        Debug.Print("  Lzz = " & vMoI(8) & " kg*m^2")
 
 
    End Sub
 
    ''' <summary>
    ''' The SldWorks swApp variable is pre-assigned for you.
    ''' </summary>
    Public swApp As SldWorks
 
 
End Class


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