我尝试使用 Modelica 语言在 Ansys Twinbuilder 2021 R1 中模拟液压机。
整个系统如下图所示；
首先我尝试将整个系统划分为子系统。我模拟了 Pumpraum-1、pumpraum-2、pumpraum-3 和导出组件的子系统。并且各个子系统单独工作没有任何问题。然后我尝试将子系统编译成整个系统。那么模拟就不会顺利进行。它在任何时间步停止并且不会继续到模拟结束。这可能是什么原因？我如何才能了解整个系统的问题出在哪里？
我的模型的代码如下；
model HD_3Kolben_bsp
//Declaration(s)
Real V_max = 0.000003;
Real V_tod = 0.000002;
Real N = 2800;
replaceable package medium = Modelica.Media.Water.StandardWater( );
Real opening_HP;
Real opening_LP;
constant Modelica.SIunits.AbsolutePressure patm = 1e5;
Real opening_HP_2;
Real opening_LP_2;
Real opening_HP_3;
Real opening_LP_3;
constant Modelica.SIunits.Frequency freq = 46;
//Component(s)
Modelica.Fluid.Machines.SweptVolume Kolben1 (
pistonCrossArea = 0.0001131,
clearance = 0.00000250621,
redeclare package Medium = Modelica.Media.Water.StandardWater,
nPorts = 1,
use_portsData = false,
use_T_start = true,
T_start = 293.15,
V(start = 0.005),
m(start = 0.005));
inner Modelica.Fluid.System system (p_ambient = 101325);
Modelica.Mechanics.Translational.Sources.Position Posit1 (exact = true, useSupport = false);
Modelica.Blocks.Sources.Sine Sine1 (
amplitude = 0.005567,
freqHz = freq,
offset = 0.005567,
phase = +Modelica.Constants.pi/2.01,
startTime = 0);
Modelica.Fluid.Vessels.ClosedVolume ClosedVolume1 (
V = 0.000005/2,
nPorts = 3,
redeclare package Medium = medium,
use_portsData = false);
Modelica.Fluid.Pipes.DynamicPipe pipe_CV_HD_1 (
length = 0.005,
diameter = 0.002,
redeclare package Medium = medium,
roughness = 2.5E-5);
Modelica.Fluid.Valves.ValveLinear HDVentile1 (
dp_nominal = 95,
m_flow_nominal = 0.05867441,
redeclare package Medium = medium,
opening = opening_HP);
Modelica.Fluid.Pipes.DynamicPipe pipe_ND_CV_1 (
length = 0.005,
diameter = 0.002,
redeclare package Medium = medium,
roughness = 2.5E-5);
Modelica.Fluid.Valves.ValveLinear NDVentile1 (
dp_nominal = 94.35,
m_flow_nominal = 0.05867441,
redeclare package Medium = medium,
opening = opening_LP);
Modelica.Fluid.Pipes.DynamicPipe pipe_Ein_ND (
length = 0.005,
diameter = 0.002,
redeclare package Medium = medium,
roughness = 2.5E-5);
Modelica.Fluid.Sources.FixedBoundary Einlass (p = 4e5, redeclare package Medium = Modelica.Media.Water.StandardWater, nPorts = 1);
Modelica.Mechanics.Translational.Sensors.PositionSensor Position;
Modelica.Mechanics.Translational.Sensors.PositionSensor Position2;
Modelica.Fluid.Valves.ValveLinear NDVentile2 (
dp_nominal = 94.35,
m_flow_nominal = 0.05867441,
redeclare package Medium = medium,
opening = opening_LP_2);
Modelica.Fluid.Pipes.DynamicPipe pipe_ND_CV_2 (
length = 0.005,
diameter = 0.002,
redeclare package Medium = medium,
roughness = 2.5E-5);
Modelica.Fluid.Valves.ValveLinear HDVentile2 (
dp_nominal = 95,
m_flow_nominal = 0.05867441,
redeclare package Medium = medium,
opening = opening_HP_2);
Modelica.Fluid.Pipes.DynamicPipe pipe_CV_HD_2 (
length = 0.005,
diameter = 0.002,
redeclare package Medium = medium,
roughness = 2.5E-5);
Modelica.Fluid.Vessels.ClosedVolume ClosedVolume2 (
V = 0.000005/2,
nPorts = 3,
redeclare package Medium = medium,
use_portsData = false);
Modelica.Blocks.Sources.Sine Sine2 (
amplitude = 0.005567,
freqHz = freq,
offset = 0.005567,
phase = +Modelica.Constants.pi/2.01,
startTime = 7/(3*freq));
Modelica.Mechanics.Translational.Sources.Position Posit2 (exact = true, useSupport = false);
Modelica.Fluid.Machines.SweptVolume Kolben2 (
pistonCrossArea = 0.0001131,
clearance = 0.00000250621,
redeclare package Medium = Modelica.Media.Water.StandardWater,
nPorts = 1,
use_portsData = false,
use_T_start = true,
T_start = 293.15,
V(start = 0.005),
m(start = 0.005));
Modelica.Mechanics.Translational.Sensors.PositionSensor Position3;
Modelica.Fluid.Valves.ValveLinear NDVentile3 (
dp_nominal = 94.35,
m_flow_nominal = 0.05867441,
redeclare package Medium = medium,
opening = opening_LP_3);
Modelica.Fluid.Pipes.DynamicPipe pipe_ND_CV_3 (
length = 0.005,
diameter = 0.002,
redeclare package Medium = medium,
roughness = 2.5E-5);
Modelica.Fluid.Valves.ValveLinear HDVentile3 (
dp_nominal = 95,
m_flow_nominal = 0.05867441,
redeclare package Medium = medium,
opening = opening_HP_3);
Modelica.Fluid.Pipes.DynamicPipe pipe_CV_HD_3 (
length = 0.005,
diameter = 0.002,
redeclare package Medium = medium,
roughness = 2.5E-5);
Modelica.Fluid.Vessels.ClosedVolume ClosedVolume3 (
V = 0.000005/2,
nPorts = 3,
redeclare package Medium = medium,
use_portsData = false);
Modelica.Blocks.Sources.Sine Sine3 (
amplitude = 0.005567,
freqHz = freq,
offset = 0.005567,
phase = +Modelica.Constants.pi/2.01,
startTime = 14/(3*freq));
Modelica.Mechanics.Translational.Sources.Position Posit3 (exact = true, useSupport = false);
Modelica.Fluid.Machines.SweptVolume Kolben3 (
pistonCrossArea = 0.0001131,
clearance = 0.00000250621,
redeclare package Medium = Modelica.Media.Water.StandardWater,
nPorts = 1,
use_portsData = false,
use_T_start = true,
T_start = 293.15,
V(start = 0.005),
m(start = 0.005));
Modelica.Fluid.Sources.FixedBoundary boundary1 (p = 4e5, redeclare package Medium = Modelica.Media.Water.StandardWater, nPorts = 1);
Modelica.Fluid.Pipes.DynamicPipe pipe1 (
length = 0.005,
diameter = 0.002,
redeclare package Medium = medium,
roughness = 2.5E-5);
Modelica.Fluid.Sources.FixedBoundary boundary2 (p = 4e5, redeclare package Medium = Modelica.Media.Water.StandardWater, nPorts = 1);
Modelica.Fluid.Pipes.DynamicPipe pipe2 (
length = 0.005,
diameter = 0.002,
redeclare package Medium = medium,
roughness = 2.5E-5);
Modelica.Fluid.Pipes.DynamicPipe pipe3 (
length = 0.005,
diameter = 0.0055,
redeclare package Medium = medium,
roughness = 2.5E-5,
modelStructure = Modelica.Fluid.Types.ModelStructure.av_b);
Modelica.Fluid.Pipes.DynamicPipe pipe4 (
length = 0.005,
diameter = 0.0055,
redeclare package Medium = medium,
roughness = 2.5E-5,
modelStructure = Modelica.Fluid.Types.ModelStructure.av_b);
Modelica.Fluid.Pipes.DynamicPipe pipe5 (
length = 0.005,
diameter = 0.0055,
redeclare package Medium = medium,
roughness = 2.5E-5,
modelStructure = Modelica.Fluid.Types.ModelStructure.av_b);
Modelica.Fluid.Vessels.ClosedVolume volume2 (
V = 3.13e-6,
nPorts = 4,
redeclare package Medium = medium,
use_portsData = false);
Modelica.Fluid.Pipes.StaticPipe pipe (length = 0.001, diameter = 0.002, redeclare package Medium = medium);
Modelica.Fluid.Pipes.StaticPipe pipe6 (length = 0.001, diameter = 0.002, redeclare package Medium = medium);
Modelica.Fluid.Pipes.StaticPipe pipe7 (length = 0.001, diameter = 0.002, redeclare package Medium = medium);
Modelica.Fluid.Pipes.DynamicPipe pipe10_steig (
length = 0.003,
diameter = 0.002721,
redeclare package Medium = medium,
roughness = 2.5E-5,
nNodes = 1,
modelStructure = Modelica.Fluid.Types.ModelStructure.av_b);
Modelica.Fluid.Pipes.DynamicPipe pipe9_steig (
length = 0.008,
diameter = 0.00598,
redeclare package Medium = medium,
roughness = 2.5E-5,
nNodes = 1,
modelStructure = Modelica.Fluid.Types.ModelStructure.av_b);
Modelica.Fluid.Pipes.DynamicPipe pipe8 (
length = 5,
diameter = 0.0057,
redeclare package Medium = medium,
roughness = 2.5E-5,
nNodes = 1,
modelStructure = Modelica.Fluid.Types.ModelStructure.av_b);
Modelica.Fluid.Fittings.SimpleGenericOrifice orifice4 (diameter = 0.00452, zeta = 3.5, redeclare package Medium = medium);
Modelica.Fluid.Pipes.DynamicPipe Duese_2 (
length = 0.0082,
diameter = 0.0042,
redeclare package Medium = medium,
roughness = 2.5E-5,
nNodes = 1,
modelStructure = Modelica.Fluid.Types.ModelStructure.av_b);
Modelica.Fluid.Pipes.DynamicPipe Duese_3 (
length = 0.018,
diameter = 0.00452,
redeclare package Medium = medium,
roughness = 2.5E-5,
nNodes = 1,
modelStructure = Modelica.Fluid.Types.ModelStructure.av_b);
Modelica.Fluid.Pipes.DynamicPipe Duese_4 (
length = 0.0002,
diameter = 0.0005,
redeclare package Medium = medium,
roughness = 2.5E-5,
nNodes = 1,
modelStructure = Modelica.Fluid.Types.ModelStructure.av_b);
Modelica.Fluid.Pipes.DynamicPipe Duese_1 (
length = 0.393,
diameter = 0.0074,
redeclare package Medium = medium,
roughness = 2.5E-5,
nNodes = 1,
modelStructure = Modelica.Fluid.Types.ModelStructure.av_b);
Modelica.Fluid.Pipes.DynamicPipe pistole_3 (
length = 0.02,
diameter = 0.004,
redeclare package Medium = medium,
roughness = 2.5E-5,
nNodes = 1,
modelStructure = Modelica.Fluid.Types.ModelStructure.av_b);
Modelica.Fluid.Fittings.SimpleGenericOrifice orifice2 (diameter = 0.005, zeta = 0.98, redeclare package Medium = medium);
Modelica.Fluid.Pipes.DynamicPipe pistole_1 (
length = 0.041,
diameter = 0.0057,
redeclare package Medium = medium,
roughness = 2.5E-5,
nNodes = 1,
modelStructure = Modelica.Fluid.Types.ModelStructure.av_b);
Modelica.Fluid.Fittings.SimpleGenericOrifice orifice1 (diameter = 0.005, zeta = 1, redeclare package Medium = medium);
Modelica.Fluid.Pipes.DynamicPipe pistole_2 (
length = 0.269,
diameter = 0.0069,
redeclare package Medium = medium,
roughness = 2.5E-5,
nNodes = 1,
modelStructure = Modelica.Fluid.Types.ModelStructure.av_b);
Modelica.Fluid.Pipes.DynamicPipe pipe9 (
length = 0.24,
diameter = 0.005,
redeclare package Medium = medium,
roughness = 2.5E-5,
modelStructure = Modelica.Fluid.Types.ModelStructure.av_b,
nNodes = 1);
Modelica.Fluid.Sources.FixedBoundary Auslass (p = patm, redeclare package Medium = medium, nPorts = 1);
equation
if der(Position.s)>=0 then
opening_LP=1;
opening_HP=0;
else
opening_LP=0;
opening_HP=1;
end if;
if der(Position2.s)>=0 then
opening_LP_2=1;
opening_HP_2=0;
else
opening_LP_2=0;
opening_HP_2=1;
end if;
if der(Position3.s)>=0 then
opening_LP_3=1;
opening_HP_3=0;
else
opening_LP_3=0;
opening_HP_3=1;
end if;
//Connection(s)
connect(Posit1.flange, Kolben1.flange);
connect(Sine1.y, Posit1.s_ref);
connect(pipe_CV_HD_1.port_b, HDVentile1.port_a);
connect(NDVentile1.port_b, pipe_ND_CV_1.port_a);
connect(Einlass.ports[1], pipe_Ein_ND.port_a);
connect(Posit1.flange, Position.flange);
connect(Position2.flange, Posit2.flange);
connect(NDVentile2.port_b, pipe_ND_CV_2.port_a);
connect(HDVentile2.port_a, pipe_CV_HD_2.port_b);
connect(Sine2.y, Posit2.s_ref);
connect(Posit2.flange, Kolben2.flange);
connect(Position3.flange, Posit3.flange);
connect(NDVentile3.port_b, pipe_ND_CV_3.port_a);
connect(HDVentile3.port_a, pipe_CV_HD_3.port_b);
connect(Sine3.y, Posit3.s_ref);
connect(Posit3.flange, Kolben3.flange);
connect(boundary1.ports[1], pipe1.port_a);
connect(boundary2.ports[1], pipe2.port_a);
connect(pipe_Ein_ND.port_b, NDVentile1.port_a);
connect(pipe1.port_b, NDVentile2.port_a);
connect(pipe2.port_b, NDVentile3.port_a);
connect(HDVentile1.port_b, pipe3.port_a);
connect(HDVentile2.port_b, pipe4.port_a);
connect(HDVentile3.port_b, pipe5.port_a);
connect(pipe_ND_CV_1.port_b, ClosedVolume1.ports[2]);
connect(pipe_CV_HD_1.port_a, ClosedVolume1.ports[3]);
connect(pipe_ND_CV_2.port_b, ClosedVolume2.ports[2]);
connect(pipe_CV_HD_2.port_a, ClosedVolume2.ports[3]);
connect(pipe_ND_CV_3.port_b, ClosedVolume3.ports[2]);
connect(pipe_CV_HD_3.port_a, ClosedVolume3.ports[3]);
connect(pipe3.port_b, volume2.ports[1]);
connect(pipe4.port_b, volume2.ports[2]);
connect(pipe5.port_b, volume2.ports[3]);
connect(Kolben1.ports[1], pipe.port_a);
connect(pipe.port_b, ClosedVolume1.ports[1]);
connect(Kolben2.ports[1], pipe6.port_a);
connect(pipe6.port_b, ClosedVolume2.ports[1]);
connect(Kolben3.ports[1], pipe7.port_a);
connect(pipe7.port_b, ClosedVolume3.ports[1]);
connect(pipe10_steig.port_a, Duese_3.port_b);
connect(pipe9_steig.port_b, Duese_2.port_a);
connect(pipe9_steig.port_a, Duese_1.port_b);
connect(pipe10_steig.port_b, orifice4.port_a);
connect(pistole_3.port_a, pistole_2.port_b);
connect(pistole_1.port_b, pistole_2.port_a);
connect(pipe8.port_b, pistole_1.port_a);
connect(pipe8.port_a, orifice2.port_b);
connect(orifice4.port_b, Duese_4.port_a);
connect(Duese_2.port_b, Duese_3.port_a);
connect(Duese_4.port_b, Auslass.ports[1]);
connect(Duese_1.port_a, orifice1.port_b);
connect(pistole_3.port_b, orifice1.port_a);
connect(orifice2.port_a, pipe9.port_b);
connect(pipe9.port_a, volume2.ports[4]);
end HD_3Kolben_bsp;
//----------------------------------------------------------------------------
最佳答案
使用 Dymola，并在降低求解器的相对容差后，我得到以下结果:
Model error - differentiated if-then-else was not continuous: (if time < 0.050724637681159424 then 0 else Sine2.amplitudesin(289.02652413026095(time-0.050724637681159424)+Sine2.phase)) Value jumped from 0 to 0.00556683.
可以通过设置 Posit2.exact = false 来克服此错误。但随后出现了后续错误，可能是由于快速变化或整个系统不一致造成的。在不详细了解模型的情况下，这是很难判断的。所以我会把这个问题留给其他人来解决。
此外，初始化还存在一些问题，但它们似乎相当小:
IF97 medium function called with too low pressure p = -35428.5 Pa <= 611.657 Pa (triple point pressure)
Failed condition: p > 611.657
关于第二条评论:
初始化问题应该可以通过设置以下列表中的(重要)变量来解决。该列表实际上包含模拟环境必须猜测初始值的变量，因为它们没有指定。
Assuming fixed start value for the continuous states:
ClosedVolume1.medium.h(start = ClosedVolume1.h_start)
ClosedVolume1.medium.p(start = 101325.0)
ClosedVolume2.medium.h(start = ClosedVolume2.h_start)
ClosedVolume2.medium.p(start = 101325.0)
ClosedVolume3.medium.h(start = ClosedVolume3.h_start)
ClosedVolume3.medium.p(start = 101325.0)
Duese_1.mediums[1].h(start = Duese_1.h_start)
Duese_1.mediums[1].p(start = Duese_1.ps_start[1])
Duese_2.mediums[1].h(start = Duese_2.h_start)
Duese_2.mediums[1].p(start = Duese_2.ps_start[1])
Duese_3.mediums[1].h(start = Duese_3.h_start)
Duese_3.mediums[1].p(start = Duese_3.ps_start[1])
Duese_4.mediums[1].h(start = Duese_4.h_start)
Duese_4.mediums[1].p(start = Duese_4.ps_start[1])
Kolben1.medium.h(start = Kolben1.h_start)
Kolben1.medium.p(start = 101325.0)
Kolben2.medium.h(start = Kolben2.h_start)
Kolben2.medium.p(start = 101325.0)
Kolben3.medium.h(start = Kolben3.h_start)
Kolben3.medium.p(start = 101325.0)
pipe1.mediums[1].h(start = pipe1.h_start)
pipe1.mediums[2].h(start = pipe1.h_start)
pipe1.mediums[2].p(start = pipe1.ps_start[2])
pipe2.mediums[1].h(start = pipe2.h_start)
pipe2.mediums[2].h(start = pipe2.h_start)
pipe2.mediums[2].p(start = pipe2.ps_start[2])
pipe3.mediums[1].h(start = pipe3.h_start)
pipe3.mediums[1].p(start = pipe3.ps_start[1])
pipe3.mediums[2].h(start = pipe3.h_start)
pipe3.mediums[2].p(start = pipe3.ps_start[2])
pipe4.mediums[1].h(start = pipe4.h_start)
pipe4.mediums[1].p(start = pipe4.ps_start[1])
pipe4.mediums[2].h(start = pipe4.h_start)
pipe4.mediums[2].p(start = pipe4.ps_start[2])
pipe5.mediums[1].h(start = pipe5.h_start)
pipe5.mediums[1].p(start = pipe5.ps_start[1])
pipe5.mediums[2].h(start = pipe5.h_start)
pipe5.mediums[2].p(start = pipe5.ps_start[2])
pipe8.mediums[1].h(start = pipe8.h_start)
pipe8.mediums[1].p(start = pipe8.ps_start[1])
pipe9.mediums[1].h(start = pipe9.h_start)
pipe9_steig.mediums[1].h(start = pipe9_steig.h_start)
pipe9_steig.mediums[1].p(start = pipe9_steig.ps_start[1])
pipe10_steig.mediums[1].h(start = pipe10_steig.h_start)
pipe10_steig.mediums[1].p(start = pipe10_steig.ps_start[1])
pipe_CV_HD_1.mediums[1].h(start = pipe_CV_HD_1.h_start)
pipe_CV_HD_1.mediums[2].h(start = pipe_CV_HD_1.h_start)
pipe_CV_HD_1.mediums[2].p(start = pipe_CV_HD_1.ps_start[2])
pipe_CV_HD_2.mediums[1].h(start = pipe_CV_HD_2.h_start)
pipe_CV_HD_2.mediums[2].h(start = pipe_CV_HD_2.h_start)
pipe_CV_HD_2.mediums[2].p(start = pipe_CV_HD_2.ps_start[2])
pipe_CV_HD_3.mediums[1].h(start = pipe_CV_HD_3.h_start)
pipe_CV_HD_3.mediums[2].h(start = pipe_CV_HD_3.h_start)
pipe_CV_HD_3.mediums[2].p(start = pipe_CV_HD_3.ps_start[2])
pipe_Ein_ND.mediums[1].h(start = pipe_Ein_ND.h_start)
pipe_Ein_ND.mediums[2].h(start = pipe_Ein_ND.h_start)
pipe_Ein_ND.mediums[2].p(start = pipe_Ein_ND.ps_start[2])
pipe_ND_CV_1.mediums[1].h(start = pipe_ND_CV_1.h_start)
pipe_ND_CV_1.mediums[1].p(start = pipe_ND_CV_1.ps_start[1])
pipe_ND_CV_1.mediums[2].h(start = pipe_ND_CV_1.h_start)
pipe_ND_CV_2.mediums[1].h(start = pipe_ND_CV_2.h_start)
pipe_ND_CV_2.mediums[1].p(start = pipe_ND_CV_2.ps_start[1])
pipe_ND_CV_2.mediums[2].h(start = pipe_ND_CV_2.h_start)
pipe_ND_CV_3.mediums[1].h(start = pipe_ND_CV_3.h_start)
pipe_ND_CV_3.mediums[1].p(start = pipe_ND_CV_3.ps_start[1])
pipe_ND_CV_3.mediums[2].h(start = pipe_ND_CV_3.h_start)
pistole_1.mediums[1].h(start = pistole_1.h_start)
pistole_1.mediums[1].p(start = pistole_1.ps_start[1])
pistole_2.mediums[1].h(start = pistole_2.h_start)
pistole_2.mediums[1].p(start = pistole_2.ps_start[1])
pistole_3.mediums[1].h(start = pistole_3.h_start)
pistole_3.mediums[1].p(start = pistole_3.ps_start[1])
volume2.medium.h(start = volume2.h_start)
volume2.medium.p(start = 101325.0)
关于modelica - 液压系统仿真，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/66137121/