校准第二支路热流体能量与管路摩擦

tests/test_mechanical_solver_causalization.py

@@ -396,8 +396,38 @@ class MechanicalSolverCausalizationTests(unittest.TestCase):
         self.assertAlmostEqual(result.series["mass.v"][0], -0.5 * mass.dvel)
         self.assertLess(min(result.series["mass.x"]), 0.0)
         self.assertLessEqual(max(result.series["mass.x"]), 1.0e-15)
-        self.assertAlmostEqual(result.series["mass.x"][-1], 0.0, places=15)
-        self.assertAlmostEqual(result.series["mass.v"][-1], 0.0, places=15)
+        self.assertAlmostEqual(result.series["mass.x"][-1], 0.0, delta=5.0e-15)
+        self.assertAlmostEqual(result.series["mass.v"][-1], 0.0, delta=1.1e-12)
+
+    def test_ideal_upper_stop_ignores_jacobian_scale_inward_velocity_noise(self) -> None:
+        system, mass = _single_mass_system(
+            100.0,
+            stoptype=1.0,
+            x0=0.0,
+            xmin=-1.0,
+            xmax=0.0,
+        )
+        initial_state = system.consistent_initial_state_vector()
+        perturbed_state = [-1.0e-14, initial_state[1]]
+
+        self.assertEqual(system.rhs(0.0, initial_state), [0.0, 0.0])
+        self.assertEqual(system.rhs(0.0, perturbed_state), [0.0, 0.0])
+        self.assertEqual(mass.v, -1.0e-14)
+
+    def test_ideal_lower_stop_ignores_jacobian_scale_outward_velocity_noise(self) -> None:
+        system, mass = _single_mass_system(
+            -100.0,
+            stoptype=1.0,
+            x0=0.0,
+            xmin=0.0,
+            xmax=1.0,
+        )
+        initial_state = system.consistent_initial_state_vector()
+        perturbed_state = [1.0e-14, initial_state[1]]
+
+        self.assertEqual(system.rhs(0.0, initial_state), [0.0, 0.0])
+        self.assertEqual(system.rhs(0.0, perturbed_state), [0.0, 0.0])
+        self.assertEqual(mass.v, 1.0e-14)
 
     def test_ideal_stop_rejects_initial_position_outside_limits(self) -> None:
         system, _mass = _single_mass_system(