openmodelica

问题 I am simulating a heat pump water heating system in Modelica. I have attached the picture of my model. However, when I run the model I get the error "Medium is partial, name lookup is not allowed in partial classes". Can you please let me know: How should I specify the water in tank, heat pump condenser and pipe? How should I specify air in heat pump evaporator? And in general, I did not find any example of modeling thermal systems in Openmodelica, can you suggest a source? Thanks 来源： https:/

问题 I want to get into modeling with modelica especially the thermial and fluid branches. So now I am reversing and altering examples from stackoverflow and the modelica library to get to know the language better. At the moment I try to understand Modelica.Fluid.Examples.DrumBoiler.DrumBoiler . I have no problems to comprehend what the model does physically. But when I rebuilt it, I get the error message: Function Cv.from_bar not found in scope DrumBoiler. I rebuild the model from scratch and I

问题 I build a simple to model in Dymola, but I got confused about the der() operator, why does the der() operator apply to the time variable only? What if I want to use the derivate to other variables In the following code, if I want to calculate dy/dx (derivative of y to x), how should I do this? model A Real x, y, z; equation x=10; y=sin(x); z=der(y); end A; 回答1: Partial derivatives are supported via functions. See chapter 12.7.2 in Modelica Spec 3.4: Partial Derivatives of Functions . You have

来源： https://stackoverflow.com/questions/64635666/differential-evolution-gets-error-with-workers-1

问题 Is there an alternative to the sample function in Openmodelica, which accepts arguments which are not of type parameter ? That is, the alternative should permit the sampling of a variable range of values during a simulation. The end goal is to create a class with which I can measure the RMS value of a real signal during a simulation. The RMS value is used as a control variable. The real signal has a continuously changing frequency so in order to have better measurements, I want to either be

问题 Is there an alternative to the sample function in Openmodelica, which accepts arguments which are not of type parameter ? That is, the alternative should permit the sampling of a variable range of values during a simulation. The end goal is to create a class with which I can measure the RMS value of a real signal during a simulation. The RMS value is used as a control variable. The real signal has a continuously changing frequency so in order to have better measurements, I want to either be

问题 Is there an alternative to the sample function in Openmodelica, which accepts arguments which are not of type parameter ? That is, the alternative should permit the sampling of a variable range of values during a simulation. The end goal is to create a class with which I can measure the RMS value of a real signal during a simulation. The RMS value is used as a control variable. The real signal has a continuously changing frequency so in order to have better measurements, I want to either be

问题 Is there an alternative to the sample function in Openmodelica, which accepts arguments which are not of type parameter ? That is, the alternative should permit the sampling of a variable range of values during a simulation. The end goal is to create a class with which I can measure the RMS value of a real signal during a simulation. The RMS value is used as a control variable. The real signal has a continuously changing frequency so in order to have better measurements, I want to either be

问题 I am referring to this post: alternative to sample function with varying sampling range I want to measure an RMS value (or a mean value) with a variable sampling frequency, which i can feed in as an input signal. The suggested way which nearly suits my need is the following: model RMS constant Real f_max = 2*2*asin(1.0); constant Real f = 1+abs(2*asin(time)); Real signal = sin(time); Real rms = if time < f then (if time < 1e-10 then signal else sqrt(i_sq / time)) else sqrt(i_sq_f / f); Real i