openmodelica

问题 Let A be a partial model and C , D be models which extend A . Given a model partial model X A a[3]; end X; how can I instantiate X, e.g. something along the lines of A X.a = {C,D,C}; Update : I tried 2 variants. One is package P partial model A end A; model B extends A; end B; model C extends A; end C; partial model X A a[3]; end X; model Y extends X(a={c,b,c}); B b; C c; end Y; end P; which fails with the warning "May only set inputs, parameters, and variables with default, but modified a."

问题 Following this question, I'm trying to compare the results of the simulation between JModelica and OpenModelica. The Modelica file is identical to the above-mentioned post and the JModelica wrapper is the corrected version: #%% from pymodelica import compile_fmu from pyfmi import load_fmu import matplotlib.pylab as plt #%% model_name = 'friction1D.fricexample_1' mofile = 'friction1D.mo' #%% fmu_name = compile_fmu(model_name, mofile) sim = load_fmu(fmu_name) #%% opts = sim.simulate_options()

问题 I have implemented a delay operator in algorithm section of a class as shown in the test case below, but during the execution of the codes in Open modelica, I face the below error. how can I fix the problem? model test3 Real x=sin(377*time); Real z; parameter Real tau[:]={0.01,0.02}; equation algorithm for k in 1: 2 loop z:=delay(x,tau[k]); end for; end test3; 回答1: Looks like a tool issue. On the other hand, why would you calculate z for k=1 and never use it? 回答2: Like tbeu said in his answer

问题 Suppose that I'd like to model an alarm clock that produces 10 beeps (one per second) every morning at 01:00: model DailyBeep import SI = Modelica.SIunits; import Modelica.SIunits.Conversions.*; constant SI.Time oneDay = 86459.17808 "one day in seconds"; parameter SI.Time startTime = from_hour(1) "time to start beeping"; parameter Real numBeeps = 10 "the number of beeps to make"; Boolean beeping "true when we should beep every second"; Real beepsRemaining "the number of beeps remaining";

问题 I have a model of a tank that I am creating as follows: model Tank "Simple model of a tank" parameter Real volume=1 "tank volume (m^3)"; parameter Integer num_ports=1 "Number of ports"; parameter Real static_pressure=1 "Internal Tank Pressure"; parameter Real initial_level = 0; Stream[num_ports] ports "Stream Connectors"; Real level "Level in % 0-100"; protected Real vol "Volume of medium in the tank"; Real pressure(start=static_pressure) "Pressure inside the tank"; initial equation level =

问题 I'm trying to follow this example to generate a random function of time: model testData extends Modelica.Icons.Example; parameter Real k = 1.0; Real theta1; Real theta2; parameter Real tau = 1.0; parameter Modelica.SIunits.Period samplePeriod = 0.05; parameter Integer globalSeed = 30020; output Real omega1; algorithm when initial() then state1024 := Generators.Xorshift1024star.initialState(localSeed, globalSeed); omega1 := 0; elsewhen sample(0,samplePeriod) then (omega1,state1024) :=

问题 I've been working within the ThermoPower Library of OpenModelica for a while now trying to build a Combined Power Cycle by first modeling the Brayton and Rankine Power Cycles first. Every time I attempt to use a pump, I always receive errors like: [1] 10:31:00 Translation Error [ThermoPower.Examples: 2523:70-2523:81]: Variable q_nom not found in scope ThermoPower.Examples.RankineCycle.Models. [2] 10:31:00 Translation Error [ThermoPower.Examples: 2531:21-2531:69]: Cyclically dependent

问题 Given a model with an array x of connectors where its size is unspecified, e.g. connector con ... end con; model test con x[:]; end test; How can x be instantiated with a specific size, e.g. something like this? test t(x = ?); ... equation connect(t.x[1], a); connect(t.x[2], b); ... 回答1: Why do you need unspecified dimension? You can do something like this: connector con ... end con; model test constant Integer dim = 1; con x[dim]; end test; // usage test(dim = 10); ... equation connect(t.x[1

问题 I am making simulations for long times and I need to check the output when the simulation is continuing. Another reason is that I am doing real-time simulation so I want to see the output in real-time as well. That would be perfect if OpenModelica creates an output file during the simulation so that I can read and plot it using 3rd party tools, maybe Python. So far as I know, OpenModelica creates output file only at the end of the simulation. Is there a way to create an output file using a

问题 Following this question, I modified my code to: model test // types type Mass = Real(unit = "Kg", min = 0); type Length = Real(unit = "m"); type Area = Real(unit = "m2", min = 0); type Force = Real(unit = "Kg.m/s2"); type Pressure = Real(unit = "Kg/m/s2"); type Torque = Real(unit = "Kg.m2/s2"); type Velocity = Real(unit = "m/s"); type Time = Real(unit = "s"); // constants constant Real pi = 2 * Modelica.Math.asin(1.0); parameter Mass Mp = 0.01; parameter Length r1 = 0.010; parameter Length r3