公开PNRP17并接通实时气动机械耦合
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from __future__ import annotations
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from collections.abc import Mapping
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from math import pi
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from app.simulation.components.amesim.gases import (
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AMESIM_GAS_INDEX_PARAMETER,
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normalize_amesim_gas_index,
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)
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from app.simulation.core.base import AlgebraicComponent
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from app.simulation.core.catalog import ComponentDisplaySpec, PortDisplaySpec
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from app.simulation.core.equations import EquationResidual
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from app.simulation.core.metadata import ParameterDefinition, ResultVariableDefinition
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from app.simulation.core.medium import GasMedium
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from app.simulation.core.ports import PortDefinition
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AMESIM_REFERENCE_PRESSURE_PA = 101300.0
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class AmesimPnrp17(AlgebraicComponent):
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"""AMESim PNRP17 pneumatic piston with two mechanical faces.
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Mechanical ports 2/5 share the piston-side motion and ports 3/4 share the
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cylinder-side motion. The pneumatic port contributes its swept volume and
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volume rate to the connected variable-volume chamber.
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"""
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MODEL_TYPE = "amesim_pnrp17"
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MODEL_VERSION = "0.1.0"
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PORTS = (
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PortDefinition.pneumatic("port_1", nominal_role="bidirectional"),
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PortDefinition.mechanical_translational("port_2"),
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PortDefinition.mechanical_translational("port_3"),
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PortDefinition.mechanical_translational("port_4"),
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PortDefinition.mechanical_translational("port_5"),
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)
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PARAMETERS = (
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AMESIM_GAS_INDEX_PARAMETER,
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ParameterDefinition(
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"dp",
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0.2,
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label="活塞直径",
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quantity="length",
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unit="m",
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minimum=0.0,
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minimum_exclusive=True,
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description="活塞外径；与活塞杆直径共同确定有效受压面积。",
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),
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ParameterDefinition(
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"dr",
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0.001,
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label="活塞杆直径",
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quantity="length",
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unit="m",
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minimum=0.0,
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description="穿过气室一侧的活塞杆直径，必须不大于活塞直径。",
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),
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ParameterDefinition(
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"x0",
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0.0,
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label="初始腔长",
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quantity="length",
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unit="m",
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description="机械端位移均为零时的气动腔长度。",
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),
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)
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RESULT_VARIABLES = (
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ResultVariableDefinition("volume", "扫掠容积", "volume", "m3", "derived", 10),
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ResultVariableDefinition(
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"volume_flow",
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"扫掠容积变化率",
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"volume_flow",
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"m3/s",
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"derived",
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20,
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),
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ResultVariableDefinition("length", "气动腔长度", "length", "m", "derived", 30),
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ResultVariableDefinition(
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"pressure_force",
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"气压力",
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"force",
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"N",
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"derived",
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40,
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),
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)
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DISPLAY = ComponentDisplaySpec(
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label="PNRP17 气动活塞",
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library_id="amesim",
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category_id="mechanical",
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symbol="amesim_pnrp17",
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ports=(
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PortDisplaySpec("port_1", "left", order=10),
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PortDisplaySpec("port_3", "left", order=20),
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PortDisplaySpec("port_4", "left", order=30),
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PortDisplaySpec("port_2", "right", order=40),
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PortDisplaySpec("port_5", "right", order=50),
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),
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order=60,
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)
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def __init__(
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self,
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name: str,
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medium: GasMedium,
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*,
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gi: float = 0.0,
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dp: float = 0.2,
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dr: float = 0.001,
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x0: float = 0.0,
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) -> None:
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super().__init__(name=name)
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self.set_parameter_values({"gi": gi, "dp": dp, "dr": dr, "x0": x0})
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self.medium = medium
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self.gi = normalize_amesim_gas_index(gi)
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self.dp = float(dp)
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self.dr = float(dr)
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self.x0 = float(x0)
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if self.dr > self.dp:
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raise ValueError("PNRP17 rod diameter dr must not exceed piston diameter dp.")
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for definition in self.PORTS:
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port = self.register_declared_port(definition.name)
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setattr(self, definition.name, port)
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self.port_1.h_outflow = medium.specific_enthalpy(medium.T_ref)
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@classmethod
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def create(
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cls,
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*,
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name: str,
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medium: GasMedium,
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parameters: Mapping[str, float],
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) -> "AmesimPnrp17":
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return cls(name=name, medium=medium, **dict(parameters))
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@property
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def effective_area(self) -> float:
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return pi * (self.dp * self.dp - self.dr * self.dr) / 4.0
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@property
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def chamber_length(self) -> float:
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return self.x0 + self.port_5.x - self.port_4.x
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@property
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def chamber_volume(self) -> float:
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return self.effective_area * self.chamber_length
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@property
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def chamber_volume_flow(self) -> float:
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return self.effective_area * (self.port_5.v - self.port_4.v)
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@property
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def pressure_force(self) -> float:
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return (self.port_1.p - AMESIM_REFERENCE_PRESSURE_PA) * self.effective_area
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def pressure_flow_equation_residuals(self) -> tuple[EquationResidual, ...]:
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effort_pairs = (("port_2", "port_5"), ("port_3", "port_4"))
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residuals: list[EquationResidual] = [
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EquationResidual(
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id=f"{self.name}:pneumatic_zero_mass_flow",
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owner="component",
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owner_id=self.name,
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relation="constitutive",
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variables=(f"{self.name}.port_1.m_flow",),
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role="flow",
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value=self.port_1.m_flow,
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)
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]
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for first_name, second_name in effort_pairs:
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first = self.get_port(first_name)
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second = self.get_port(second_name)
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for variable in ("x", "v"):
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residuals.append(
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EquationResidual(
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id=f"{self.name}:{first_name}_{second_name}_{variable}_equal",
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owner="component",
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owner_id=self.name,
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relation="equal",
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variables=(
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f"{self.name}.{first_name}.{variable}",
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f"{self.name}.{second_name}.{variable}",
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),
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role="effort",
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value=getattr(first, variable) - getattr(second, variable),
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)
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)
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force = self.pressure_force
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residuals.extend(
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(
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EquationResidual(
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id=f"{self.name}:piston_side_force_balance",
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owner="component",
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owner_id=self.name,
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relation="constitutive",
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variables=(f"{self.name}.port_2.f", f"{self.name}.port_5.f", f"{self.name}.port_1.p"),
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role="flow",
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value=self.port_2.f + self.port_5.f + force,
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),
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EquationResidual(
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id=f"{self.name}:cylinder_side_force_balance",
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owner="component",
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owner_id=self.name,
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relation="constitutive",
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variables=(f"{self.name}.port_3.f", f"{self.name}.port_4.f", f"{self.name}.port_1.p"),
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role="flow",
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value=self.port_3.f + self.port_4.f - force,
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),
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)
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)
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return tuple(residuals)
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def pneumatic_volume_outputs(self) -> Mapping[str, tuple[float, float]]:
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return {"port_1": (self.chamber_volume, self.chamber_volume_flow)}
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def update_stream_outflows(self, connected_h: Mapping[str, float]) -> None:
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self.port_1.h_outflow = connected_h.get(
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"port_1",
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self.medium.specific_enthalpy(self.medium.T_ref),
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)
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def component_result_values(self) -> Mapping[str, float]:
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return {
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"volume": self.chamber_volume,
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"volume_flow": self.chamber_volume_flow,
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"length": self.chamber_length,
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"pressure_force": self.pressure_force,
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}
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