验收四路模型并优化拓扑求解性能

app/simulation/components/amesim/mechanical/translational.py

@@ -1082,7 +1082,14 @@ class AmesimLmechn1(AlgebraicComponent):
 
     @property
     def total_force(self) -> float:
-        return sum(self.get_port(port_name).f for port_name in self.active_ports)
+        # AMESim's ``tforce`` is the force transmitted by the summed branch
+        # ports (1..v1). Port 9 is the balancing/common port and is excluded
+        # from that reported value.
+        return sum(self.get_port(port_name).f for port_name in self.active_ports[:-1])
+
+    @property
+    def force_balance(self) -> float:
+        return self.total_force + self.port_9.f
 
     def pressure_flow_equation_residuals(self) -> tuple[EquationResidual, ...]:
         reference = self.port_9
@@ -1119,7 +1126,7 @@ class AmesimLmechn1(AlgebraicComponent):
                 relation="sumToZero",
                 variables=tuple(f"{self.name}.{port_name}.f" for port_name in self.active_ports),
                 role="flow",
-                value=self.total_force,
+                value=self.force_balance,
             )
         )
         return tuple(residuals)