interpolateMagneticFlux

Interpolate magnetic flux density in magnetostatic result at arbitrary spatial locations

Since R2021a

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    Syntax

    Bintrp = interpolateMagneticFlux(magnetostaticresults,xq,yq)
    Bintrp = interpolateMagneticFlux(magnetostaticresults,xq,yq,zq)
    Bintrp = interpolateMagneticFlux(magnetostaticresults,querypoints)

    Description

    Bintrp = interpolateMagneticFlux(magnetostaticresults,xq,yq) returns the interpolated magnetic flux density at the 2-D points specified in xq and yq.

    example

    Bintrp = interpolateMagneticFlux(magnetostaticresults,xq,yq,zq) uses 3-D points specified in xq, yq, and zq.

    example

    Bintrp = interpolateMagneticFlux(magnetostaticresults,querypoints) returns the interpolated magnetic flux density at the points specified in querypoints.

    example

    Examples

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    Open Live Script

    Create a square geometry and plot it with the edge labels.

    R1 = [3,4,-1,1,1,-1,1,1,-1,-1]';
g = decsg(R1,'R1',('R1')');
pdegplot(g,EdgeLabels="on")
xlim([-1.1 1.1])
ylim([-1.1 1.1])

    Figure contains an axes object. The axes object contains 5 objects of type line, text.

    Create an femodel object for magnetostatic analysis and include the geometry into the model.

    model = femodel(AnalysisType="magnetostatic", ...
                Geometry=g);

    Specify the vacuum permeability in the SI system of units.

    model.VacuumPermeability = 1.2566370614E-6;

    Specify the relative permeability of the material.

    model.MaterialProperties = ...
    materialProperties(RelativePermeability=5000);

    Apply the magnetic potential boundary conditions on the boundaries of the square.

    model.EdgeBC([1 3]) = edgeBC(MagneticPotential=0);
model.EdgeBC([2 4]) = edgeBC(MagneticPotential=0.01);

    Specify the current density for the entire geometry.

    model.FaceLoad = faceLoad(CurrentDensity=0.5);

    Generate the mesh.

    model = generateMesh(model);

    Solve the problem and plot the magnetic flux density.

    R = solve(model);
pdeplot(R.Mesh,FlowData=[R.MagneticFluxDensity.Bx ...
                         R.MagneticFluxDensity.By])
axis equal

    Figure contains an axes object. The axes object contains an object of type quiver.

    Interpolate the resulting electric flux density to a grid covering the central portion of the geometry, for x and y from -0.5 to 0.5.

    v = linspace(-0.5,0.5,51);
[X,Y] = meshgrid(v);
Bintrp = interpolateMagneticFlux(R,X,Y)
    Bintrp = 
  FEStruct with properties:

    Bx: [2601×1 double]
    By: [2601×1 double]

    Reshape Bintrp.Bx and Bintrp.By and plot the resulting magnetic flux density.

    BintrpX = reshape(Bintrp.Bx,size(X));
BintrpY = reshape(Bintrp.By,size(Y));
figure
quiver(X,Y,BintrpX,BintrpY,Color="red")
axis equal

    Figure contains an axes object. The axes object contains an object of type quiver.

    Alternatively, you can specify the grid by using a matrix of query points.

    querypoints = [X(:),Y(:)]';
Bintrp = interpolateMagneticFlux(R,querypoints);
    Open Live Script

    Create an femodel object for magnetostatic analysis and include a geometry of a plate with a hole into the model.

    model = femodel(AnalysisType="magnetostatic", ...
                Geometry="PlateHoleSolid.stl");

    Plot the geometry.

    pdegplot(model.Geometry,FaceLabels="on",FaceAlpha=0.3)

    Figure contains an axes object. The axes object contains 6 objects of type quiver, text, patch, line.

    Specify the vacuum permeability value in the SI system of units.

    model.VacuumPermeability = 1.2566370614E-6;

    Specify the relative permeability of the material.

    model.MaterialProperties = ...
    materialProperties(RelativePermeability=5000);

    Specify the current density for the entire geometry.

    model.CellLoad = cellLoad(CurrentDensity=[0;0;0.5]);

    Apply the magnetic potential boundary conditions on the side faces and the face bordering the hole.

    model.FaceBC(3:6) = faceBC(MagneticPotential=[0;0;0]);
model.FaceBC(7) = faceBC(MagneticPotential=[0;0;0.01]);

    Generate a mesh.

    model = generateMesh(model);

    Solve the problem.

    R = solve(model)
    R = 
  MagnetostaticResults with properties:

      MagneticPotential: [1×1 FEStruct]
          MagneticField: [1×1 FEStruct]
    MagneticFluxDensity: [1×1 FEStruct]
                   Mesh: [1×1 FEMesh]

    Plot the magnetic flux density.

    pdeplot3D(R.Mesh,FlowData=[R.MagneticFluxDensity.Bx ...
                           R.MagneticFluxDensity.By ...
                           R.MagneticFluxDensity.Bz])

    Figure contains an axes object. The hidden axes object contains 5 objects of type quiver, text.

    Interpolate the resulting magnetic flux density to a grid covering the central portion of the geometry, for x, y, and z.

    x = linspace(3,7,5);
y = linspace(0,1,5);
z = linspace(8,12,5);
[X,Y,Z] = meshgrid(x,y,z);
Bintrp = interpolateMagneticFlux(R,X,Y,Z)
    Bintrp = 
  FEStruct with properties:

    Bx: [125×1 double]
    By: [125×1 double]
    Bz: [125×1 double]

    Reshape Bintrp.Bx, Bintrp.By, and Bintrp.Bz.

    BintrpX = reshape(Bintrp.Bx,size(X));
BintrpY = reshape(Bintrp.By,size(Y));
BintrpZ = reshape(Bintrp.Bz,size(Z));

    Plot the resulting magnetic flux density.

    figure
quiver3(X,Y,Z,BintrpX,BintrpY,BintrpZ,Color="red")
view([30 10])
view([10 15])

    Figure contains an axes object. The axes object contains an object of type quiver.

    Input Arguments

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    Solution of a magnetostatic problem, specified as a MagnetostaticResults object. Create magnetostaticresults using the solve function.

    x-coordinate query points, specified as a real array. interpolateMagneticFlux evaluates the magnetic flux density at the 2-D coordinate points [xq(i) yq(i)] or at the 3-D coordinate points [xq(i) yq(i) zq(i)] for every i. Because of this, xq, yq, and (if present) zq must have the same number of entries.

    interpolateMagneticFlux converts the query points to column vectors xq(:) and yq(:). It returns magnetic flux density as a column vector of the same size. To ensure that the dimensions of the returned solution are consistent with the dimensions of the original query points, use reshape. For example, use BintrpX = reshape(Bintrp.Bx,size(xq)).

    Example: xq = [0.5 0.5 0.75 0.75]

    Data Types: double

    y-coordinate query points, specified as a real array. interpolateMagneticFlux evaluates the magnetic flux density at the 2-D coordinate points [xq(i) yq(i)] or at the 3-D coordinate points [xq(i) yq(i) zq(i)] for every i. Because of this, xq, yq, and (if present) zq must have the same number of entries.

    interpolateMagneticFlux converts the query points to column vectors xq(:), yq(:), and (if present) zq(:). It returns magnetic flux density as a column vector of the same size. To ensure that the dimensions of the returned solution are consistent with the dimensions of the original query points, use reshape. For example, use BintrpY = reshape(Bintrp.By,size(yq)).

    Example: yq = [1 2 0 0.5]

    Data Types: double

    z-coordinate query points, specified as a real array. interpolateMagneticFlux evaluates the magnetic flux density at the 3-D coordinate points [xq(i) yq(i) zq(i)]. Therefore, xq, yq, and zq must have the same number of entries.

    interpolateMagneticFlux converts the query points to column vectors xq(:), yq(:), and zq(:). It returns magnetic flux density values as a column vector of the same size. To ensure that the dimensions of the returned solution are consistent with the dimensions of the original query points, use reshape. For example, use BintrpZ = reshape(Bintrp.Bz,size(zq)).

    Example: zq = [1 1 0 1.5]

    Data Types: double

    Query points, specified as a real matrix with two rows for 2-D geometry or three rows for 3-D geometry. interpolateMagneticFlux evaluates the magnetic flux density at the coordinate points querypoints(:,i) for every i, so each column of querypoints contains exactly one 2-D or 3-D query point.

    Example: For a 2-D geometry, querypoints = [0.5 0.5 0.75 0.75; 1 2 0 0.5]

    Data Types: double

    Output Arguments

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    Magnetic flux density at query points, returned as an FEStruct object with the properties representing the spatial components of the magnetic flux density at the query points. For query points that are outside the geometry, Bintrp.Bx(i), Bintrp.By(i), and Bintrp.Bz(i) are NaN. Properties of an FEStruct object are read-only.

    Version History

    Introduced in R2021a

    See Also

    Objects

    Functions