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Analytic coast integrations with PVG
PVG is now fully analytic Signed-off-by: Lamont Granquist <lamont@scriptkiddie.org>
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MechJebLibTest/PVG/Integrators/VacuumCoastAnalyticTests.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| using System; | ||
| using AssertExtensions; | ||
| using MechJebLib.Core.TwoBody; | ||
| using MechJebLib.Primitives; | ||
| using MechJebLib.PVG; | ||
| using MechJebLib.PVG.Integrators; | ||
| using Xunit; | ||
| using Xunit.Abstractions; | ||
| using static MechJebLib.Utils.Statics; | ||
|
|
||
| namespace MechJebLibTest.PVG | ||
| { | ||
| public class VacuumCoastAnalyticTests | ||
| { | ||
| private readonly ITestOutputHelper _testOutputHelper; | ||
|
|
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| public VacuumCoastAnalyticTests(ITestOutputHelper testOutputHelper) | ||
| { | ||
| _testOutputHelper = testOutputHelper; | ||
| } | ||
|
|
||
| [Fact] | ||
| void RandomComparedToIntegrated() | ||
| { | ||
| const int NTRIALS = 50; | ||
|
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| var random = new Random(); | ||
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| var integrated = new VacuumThrustIntegrator(); | ||
| var analytic = new VacuumCoastAnalytic(); | ||
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| for (int i = 0; i < NTRIALS; i++) | ||
| { | ||
| var r0 = new V3(4 * random.NextDouble() - 2, 4 * random.NextDouble() - 2, 4 * random.NextDouble() - 2); | ||
| var v0 = new V3(4 * random.NextDouble() - 2, 4 * random.NextDouble() - 2, 4 * random.NextDouble() - 2); | ||
| var pr0 = new V3(4 * random.NextDouble() - 2, 4 * random.NextDouble() - 2, 4 * random.NextDouble() - 2); | ||
| var pv0 = new V3(4 * random.NextDouble() - 2, 4 * random.NextDouble() - 2, 4 * random.NextDouble() - 2); | ||
| double dt = 40 * random.NextDouble() - 20; | ||
|
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||
| using var yin = Vn.Rent(ArrayWrapper.ARRAY_WRAPPER_LEN); | ||
| using var yout = Vn.Rent(ArrayWrapper.ARRAY_WRAPPER_LEN); | ||
| using var yout2 = Vn.Rent(ArrayWrapper.ARRAY_WRAPPER_LEN); | ||
|
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| using var y0 = ArrayWrapper.Rent(yin); | ||
| using var yf = ArrayWrapper.Rent(yout); | ||
| using var yf2 = ArrayWrapper.Rent(yout2); | ||
|
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| y0.R = r0; | ||
| y0.V = v0; | ||
| y0.PV = pv0; | ||
| y0.PR = pr0; | ||
| y0.M = 1; | ||
|
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| var phase = Phase.NewFixedCoast(1.0, dt, 1); | ||
| phase.Normalized = true; | ||
|
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| try | ||
| { | ||
| integrated.Integrate(yin, yout, phase, 0, dt); | ||
| } | ||
| catch (ArgumentException) | ||
| { | ||
| // the ODE integrator can throw iterations exceeded for certain initial | ||
| // conditions it inherently has issues with. | ||
| continue; | ||
| } | ||
|
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| analytic.Integrate(yin, yout2, phase, 0, dt); | ||
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| if (!NearlyEqual(yf.R, yf2.R, 1e-8) || !NearlyEqual(yf.V, yf2.V, 1e-8) || !NearlyEqual(yf.PV, yf2.PV, 1e-8) || !NearlyEqual(yf.PR, yf2.PR, 1e-8)) | ||
| { | ||
| _testOutputHelper.WriteLine("r0 :" + r0 + " v0:" + v0 + " dt:" + dt + "\nrf:" + yf.R + " vf:" + yf.V + "\nrf2:" + yf2.R + " vf2:" + | ||
| yf2.V + "\n"); | ||
| _testOutputHelper.WriteLine("pr0 :" + pr0 + " pv0:" + pv0 + " dt:" + dt + "\npv:" + yf.PV + " pr:" + yf.PR + "\npv2:" + yf2.PV + " pr2:" + | ||
| yf2.PR + "\n"); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |