/// <summary>
///
/// The main program executes the tests. Output may be routed to
/// various locations, depending on the arguments passed.
/// </summary>
/// <remarks>Run with --help for a full list of arguments supported</remarks>
/// <param name="args"></param>
public static int Main(string[] args)
{
// set the system of physical units to SI
INIReader.ClearSingleton();
UnitsConversionFactory.ClearSingleton();
var ini = INIReader.Instance();
ini.Values["UnitsSystem"] = "SI";
ini.Values["gravity"] = "10.0";
// run the tests
var res = new AutoRun().Execute(args);
Console.WriteLine("Press any key to close");
Console.ReadKey();
return(res);
}
public void ModelMassImperialUnits()
{
// make temporary changes to the the ini-file and units-conversion
INIReader.ClearSingleton();
UnitsConversionFactory.ClearSingleton();
var ini = INIReader.Instance();
ini.Values["UnitsSystem"] = "imperial";
ini.Values["gravity"] = "9.80665";
var k3d = new Toolkit();
var gamma = 1.0; // (kip/ft3)
var unit_material = new FemMaterial_Isotrop("unit", "unit", 1, 0.5, 0.5, gamma, 1.0, -1.0, FemMaterial.FlowHypothesis.mises, 1.0, null);
var b = 12; // (inch)
var t = 6; // (inch)
var unit_crosec = k3d.CroSec.Box(b, b, b, t, t, t, 0, 0, unit_material);
var elems = new List <BuilderBeam>()
{
k3d.Part.IndexToBeam(0, 1, "A", unit_crosec),
};
var L = 1.0; // in feet
var points = new List <Point3> {
new Point3(), new Point3(L, 0, 0)
};
var model = k3d.Model.AssembleModel(elems, null, null, out var info, out var mass, out var cog, out var msg,
out var runtimeWarning, new List <Joint>(), points);
// clear temporary changes to the the ini-file and units-conversion
INIReader.ClearSingleton();
UnitsConversionFactory.ClearSingleton();
ini = INIReader.Instance();
// switch back to SI units
ini.Values["UnitsSystem"] = "SI";
Assert.AreEqual(mass, 1000, 1e-10);
}
public void ImperialUnits()
{
var k3d = new Toolkit();
var logger = new MessageLogger();
// make temporary changes to the the ini-file and units-conversion
INIReader.ClearSingleton();
UnitsConversionFactory.ClearSingleton();
var ini = INIReader.Instance();
ini.Values["UnitsSystem"] = "imperial";
var resourcePath = @"";
// get a cross section from the cross section table in the folder 'Resources'
var crosecPath = Path.Combine(resourcePath, "CrossSections/CrossSectionValues.bin");
CroSecTable inCroSecs = k3d.CroSec.ReadCrossSectionTable(crosecPath, out var info);
var crosec_family = inCroSecs.crosecs.FindAll(x => x.family == "W");
var crosec_initial = crosec_family.Find(x => x.name == "W12X26");
// clear temporary changes to the the ini-file and units-conversion
INIReader.ClearSingleton();
UnitsConversionFactory.ClearSingleton();
var cs = crosec_initial as CroSec_I;
var m2feet = 3.28084;
var height_feet = 0.31 * m2feet;
var width_feet = 0.165 * m2feet;
Assert.AreEqual(cs._height, height_feet, 1e-5);
Assert.AreEqual(cs.lf_width, width_feet, 1e-5);
var feet42inch4 = Math.Pow(12.0, 4);
var cm42inch4 = Math.Pow(1.0 / 2.54, 4);
var Iyy_inch1 = 8491.12 * cm42inch4;
var Iyy_inch2 = cs.Iyy * feet42inch4;
Assert.AreEqual(Iyy_inch1, Iyy_inch2, 1e-1);
}
public void CantileverEigenfrequency()
{
// make temporary changes to the the ini-file and units-conversion
INIReader.ClearSingleton();
UnitsConversionFactory.ClearSingleton();
var ini = INIReader.Instance();
ini.Values["UnitsSystem"] = "imperial";
ini.Values["gravity"] = "9.80665";
var k3d = new Toolkit();
var E = 70000; // (kip/ft2) == 486111.1 (psi)
var gamma = 1.0; // (kip/ft3)
var unit_material = new FemMaterial_Isotrop("unit", "unit", E, 0.5 * E, 0.5 * E, gamma, 1.0, -1.0, FemMaterial.FlowHypothesis.mises, 1.0, null);
var b = 6; // (inch)
var t = 3; // (inch)
// Iy = 108 inch^4
// g = 20.833 lb/inch
var unit_crosec = k3d.CroSec.Box(b, b, b, t, t, t, 0, 0, unit_material);
var elems = new List <BuilderBeam>()
{
k3d.Part.IndexToBeam(0, 1, "A", unit_crosec),
};
var L = 10.0; // in feet
var points = new List <Point3> {
new Point3(), new Point3(L, 0, 0)
};
var supports = new List <Support> {
k3d.Support.Support(0, k3d.Support.SupportFixedConditions)
};
var model = k3d.Model.AssembleModel(elems, supports, null, out var info, out var mass, out var cog, out var msg,
out var runtimeWarning, new List <Joint>(), points);
// calculate the natural vibrations
int from_shape_ind = 1;
int shapes_num = 1;
int max_iter = 100;
double eps = 1e-8;
var disp_dummy = new List <double>();
var scaling = EigenShapesScalingType.matrix;
model = k3d.Algorithms.NaturalVibes(model, from_shape_ind, shapes_num, max_iter, eps, disp_dummy, scaling,
out var nat_frequencies, out var modal_masses, out var participation_facs,
out var participation_facs_disp, out model);
// calculate the expected value of the first eigen-frequency
// see Young, W. C., Budynas, R. G.(2002). Roark's Formulas for Stress and Strain .
// 7nd Edition, McGraw-Hill, Chapter 16 , pp 767 - 768
var E_ = E * 1000.0 * Math.Pow(UnitConversionCollection.inch_to_ft, 2);
var I_ = unit_crosec.Iyy / Math.Pow(UnitConversionCollection.inch_to_ft, 4);
var w_ = unit_crosec.A * gamma * 1000.0 * UnitConversionCollection.inch_to_ft;
var g_ = UnitConversionCollection.g_IU / UnitConversionCollection.inch_to_ft;
var L_ = L / UnitConversionCollection.inch_to_ft;
var Kn = 3.52;
var f1_expected = Kn / 2.0 / Math.PI * Math.Sqrt(E_ * I_ * g_ / w_ / Math.Pow(L_, 4));
Assert.AreEqual(nat_frequencies[0], f1_expected, 1e-2);
// clear temporary changes to the the ini-file and units-conversion
INIReader.ClearSingleton();
UnitsConversionFactory.ClearSingleton();
ini = INIReader.Instance();
// switch back to SI units
ini.Values["UnitsSystem"] = "SI";
}
public void SinglemassEigenfrequency_SI()
{
// make temporary changes to the the ini-file and units-conversion
INIReader.ClearSingleton();
UnitsConversionFactory.ClearSingleton();
var ini = INIReader.Instance();
ini.Values["UnitsSystem"] = "SI";
ini.Values["UnitsSystem"] = "SI";
var gravity = 9.81; // m/s2
ini.Values["gravity"] = gravity.ToString(CultureInfo.InvariantCulture);
ini.Values["UnitLength"] = "ft";
ini.Values["UnitForce"] = "MN";
ini.Values["UnitMass"] = "t";
var uc = UnitsConversionFactory.Conv();
gravity = uc.gravity().toBase(); // cm/s2
var k3d = new Toolkit();
var E = uc["N/cm2"].toBase(70);
var gamma = uc["N/cm3"].toBase(1.0);
// input is not scaled to base units
var unit_material = new FemMaterial_Isotrop("unit", "unit", E, 0.5 * E, 0.5 * E, gamma, 1.0, -1.0, FemMaterial.FlowHypothesis.mises, 1.0, null);
var b = 6; // (cm)
var t = 3; // (cm)
// input is scaled to base units
var unit_crosec = k3d.CroSec.Box(b, b, b, t, t, t, 0, 0, unit_material);
var elems = new List <BuilderBeam>()
{
k3d.Part.IndexToBeam(0, 1, "A", unit_crosec),
};
elems[0].bending_stiff = false;
var L = uc["cm"].toBase(10.0);
var points = new List <Point3> {
new Point3(), new Point3(L, 0, 0)
};
var supports = new List <Support>
{
k3d.Support.Support(0, k3d.Support.SupportFixedConditions),
k3d.Support.Support(1, new List <bool>()
{
false, true, true, true, true, true
})
};
var model = k3d.Model.AssembleModel(elems, supports, null, out var info, out var mass, out var cog, out var msg,
out var runtimeWarning, new List <Joint>(), points);
// calculate the natural vibrations
int from_shape_ind = 1;
int shapes_num = 1;
int max_iter = 100;
double eps = 1e-8;
var disp_dummy = new List <double>();
var scaling = EigenShapesScalingType.matrix;
model = k3d.Algorithms.NaturalVibes(model, from_shape_ind, shapes_num, max_iter, eps, disp_dummy, scaling,
out var nat_frequencies, out var modal_masses, out var participation_facs,
out var participation_facs_disp, out model);
var E_ = E; // N/cm2
var A_ = unit_crosec.A; // cm2
var L_ = L; // cm;
var gamma_ = unit_material.gamma(); // N/cm3
var c = E_ * A_ / L; // N / m
var m = A_ * L_ * gamma_ / gravity * 0.5; // kg
var omega0 = Math.Sqrt(c / m); // rad / sec
var f0 = omega0 / 2.0 / Math.PI; // 1 / sec = Hz
Assert.AreEqual(nat_frequencies[0], f0, 1e-2);
// clear temporary changes to the the ini-file and units-conversion
INIReader.ClearSingleton();
UnitsConversionFactory.ClearSingleton();
ini = INIReader.Instance();
// switch back to SI units
ini.Values["UnitsSystem"] = "SI";
}
public void PointMassOnSpring_SI()
{
// make temporary changes to the the ini-file and units-conversion
INIReader.ClearSingleton();
UnitsConversionFactory.ClearSingleton();
var ini = INIReader.Instance();
ini.Values["UnitsSystem"] = "SI";
ini.Values["UnitsSystem"] = "SI";
var gravity = 9.81; // m/s2
ini.Values["gravity"] = gravity.ToString(CultureInfo.InvariantCulture);
ini.Values["UnitLength"] = "cm";
ini.Values["UnitForce"] = "N";
ini.Values["UnitMass"] = "t";
var k3d = new Toolkit();
var uc = UnitsConversionFactory.Conv();
var c_trans = uc["N/cm"].toBase(50);
var c_rot = uc["Ncm/rad"].toBase(50);
var unitCrosec = k3d.CroSec.Spring(new double[] { c_trans, c_trans, c_trans, c_rot, c_rot, c_rot });
var elems = new List <BuilderBeam>()
{
k3d.Part.IndexToBeam(0, 1, "A", unitCrosec),
};
elems[0].bending_stiff = false;
var L = uc["cm"].toBase(10.0);
var points = new List <Point3> {
new Point3(), new Point3(L, 0, 0)
};
var supports = new List <Support>
{
k3d.Support.Support(0, k3d.Support.SupportFixedConditions),
k3d.Support.Support(1, new List <bool>()
{
false, true, true, true, true, true
})
};
var m = uc["kg"].toBase(50); // kg
var point_mass = new PointMass(1, m, 1);
var model = k3d.Model.AssembleModel(elems, supports, new List <Load>()
{
point_mass
}, out var info, out var mass, out var cog, out var msg,
out var runtimeWarning, new List <Joint>(), points);
// calculate the natural vibrations
int from_shape_ind = 1;
int shapes_num = 1;
int max_iter = 100;
double eps = 1e-8;
var disp_dummy = new List <double>();
var scaling = EigenShapesScalingType.matrix;
model = k3d.Algorithms.NaturalVibes(model, from_shape_ind, shapes_num, max_iter, eps, disp_dummy, scaling,
out var nat_frequencies, out var modal_masses, out var participation_facs,
out var participation_facs_disp, out model);
var omega0 = Math.Sqrt(c_trans / m); // rad / sec
var f0 = omega0 / 2.0 / Math.PI; // 1 / sec = Hz
Assert.AreEqual(nat_frequencies[0], f0, 1e-2);
// clear temporary changes to the the ini-file and units-conversion
INIReader.ClearSingleton();
UnitsConversionFactory.ClearSingleton();
ini = INIReader.Instance();
// switch back to SI units
ini.Values["UnitsSystem"] = "SI";
}
