警告：该组件被多次声明，无法验证是否与其他同名声明相同 - Modelica

Question

我在 Twin builder 上使用 Modelica 建模时收到警告。警告是：组件 m_flow_start 被多次声明，无法验证是否与其他同名声明相同。尽管这个警告对我的模型来说似乎不是那么重要，但我想了解为什么会出现这个警告以及如何避免它。

你知道如何处理这个警告吗？

model Hochdruckreiniger3
    //Declaration(s)
    Real V_max = 2506e-6;
    Real V_tod = 3765e-6;
    Real N = 2800;
    Real opening_NP;
    Real opening_HP;
    Real dp_nominal_ND = (0.7*rho_ND*0.01135*0.01135)/(3600/(2*N*N));
    Real dp_nominal_HD = (0.7*rho_HD*0.01135*0.01135)/(3600/(2*N*N));
    Real rho_ND = 998.388;
    Real rho_HD = 1019.921;
    Real m_flow_ND = rho_ND*0.000113097*0.01135*N/60;
    Real m_flow_HD = rho_HD*0.000113097*0.01135*N/60;
    //Component(s)
    Modelica.Fluid.Machines.SweptVolume Swept1 (
        pistonCrossArea = 0.0001131,
        clearance = 0.00000250621,
        redeclare package Medium = Modelica.Media.Water.StandardWater,
        nPorts = 2,
        use_portsData = false,
        p_start = 1e5,
        use_T_start = true,
        T_start = 293.15,
        V(start = 0.005),
        m(start = 0.005));
    inner Modelica.Fluid.System system;
    Modelica.Mechanics.Translational.Sources.Position Posit1 (exact = true, useSupport = false);
    Modelica.Blocks.Sources.Sine Sine1 (
        amplitude = 0.005567,
        freqHz = 16.66,
        offset = 0.005567,
        phase = -Modelica.Constants.pi/4);
    Modelica.Fluid.Sources.FixedBoundary boundary (p = 4e5, redeclare package Medium = Modelica.Media.Water.StandardWater, nPorts = 1);
    Modelica.Fluid.Pipes.DynamicPipe pipe1 (
        length = 0.5,
        diameter = 0.03,
        redeclare package Medium = Modelica.Media.Water.StandardWater,
        modelStructure = Modelica.Fluid.Types.ModelStructure.av_b);
    Modelica.Fluid.Valves.ValveIncompressible Niederdruckventile (
        dp_nominal = dp_nominal_ND,
        m_flow_nominal = m_flow_ND,
        rho_nominal = rho_ND,
        opening = opening_NP,
        redeclare package Medium = Modelica.Media.Water.StandardWater);
    Modelica.Fluid.Pipes.DynamicPipe pipe2 (
        length = 0.002,
        diameter = 0.011,
        redeclare package Medium = Modelica.Media.Water.StandardWater,
        modelStructure = Modelica.Fluid.Types.ModelStructure.av_b);
    Modelica.Fluid.Pipes.DynamicPipe pipe3 (
        length = 0.019,
        diameter = 0.0055,
        redeclare package Medium = Modelica.Media.Water.StandardWater,
        modelStructure = Modelica.Fluid.Types.ModelStructure.a_vb);
    Modelica.Fluid.Valves.ValveIncompressible Hochdruckventile (
        dp_nominal = dp_nominal_HD,
        m_flow_nominal = m_flow_HD,
        rho_nominal = rho_HD,
        opening = opening_HP,
        redeclare package Medium = Modelica.Media.Water.StandardWater);
    Modelica.Fluid.Pipes.DynamicPipe pipe4 (
        length = 0.5,
        diameter = 0.03,
        redeclare package Medium = Modelica.Media.Water.StandardWater,
        modelStructure = Modelica.Fluid.Types.ModelStructure.a_vb);
    Modelica.Fluid.Sources.FixedBoundary boundary1 (p = 5e5, redeclare package Medium = Modelica.Media.Water.StandardWater, nPorts = 1);
equation
    if der(Sine1.y)>=0 then
            opening_NP=1;
            opening_HP=0;
           else
            opening_NP=0;
            opening_HP=1;
          end if;
    //Connection(s)
    connect(Posit1.flange, Swept1.flange);
    connect(Sine1.y, Posit1.s_ref);
    connect(Niederdruckventile.port_b, pipe2.port_a);
    connect(pipe2.port_b, Swept1.ports[1]);
    connect(boundary.ports[1], pipe1.port_a);
    connect(pipe1.port_b, Niederdruckventile.port_a);
    connect(Swept1.ports[2], pipe3.port_a);
    connect(pipe3.port_b, Hochdruckventile.port_a);
    connect(Hochdruckventile.port_b, pipe4.port_a);
    connect(pipe4.port_b, boundary1.ports[1]);
end  Hochdruckreiniger3;

提前致谢！

Answer 1

我相信你可以忽略它。

据我在 Dymola 内部看到的问题是 Modelica.Fluid.Pipes.BaseClasses.FlowModels.PartialStaggeredFlowModel 继承自 Modelica.Fluid.Interfaces.PartialDistributedFlow，两者都包含 m_flow_start 的定义，在 MSL 3.2.3 中略有不同 -但仅就 parameter-dialog:

而言

parameter Medium.MassFlowRate m_flow_start=system.m_flow_start
"Start value of mass flow rates"
    annotation(Dialog(tab="Internal Interface",enable=false,group = "Initialization"));

对比

  parameter Medium.MassFlowRate m_flow_start=system.m_flow_start
"Start value of mass flow rates"
    annotation(Dialog(tab="Initialization"));

顺便说一句：该模型存在许多缺少参数的问题，应该是：

   parameter Real V_max = 2506e-6;
    parameter Real V_tod = 3765e-6;
    parameter Real N = 2800;
     Real opening_NP;
     Real opening_HP;
    parameter Real dp_nominal_ND = (0.7*rho_ND*0.01135*0.01135)/(3600/(2*N*N));
    parameter Real dp_nominal_HD = (0.7*rho_HD*0.01135*0.01135)/(3600/(2*N*N));
    parameter Real rho_ND = 998.388;
    parameter Real rho_HD = 1019.921;
    parameter Real m_flow_ND = rho_ND*0.000113097*0.01135*N/60;
    parameter Real m_flow_HD = rho_HD*0.000113097*0.01135*N/60;

警告：该组件被多次声明，无法验证是否与其他同名声明相同 - Modelica

Warning : The component is declared multiple times and can not be verified to be identical to other declaration(s) with the same name - Modelica

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