OpenModelica/C2/Introduction-to-OMEdit/English-timed
From Script | Spoken-Tutorial
| Time | Narration |
| 00:01 | Welcome to this spoken tutorial on Introduction to OMEdit. |
| 00:07 | In this tutorial, we will learn about: OpenModelica introduction to OMEdit, |
| 00:15 | open a Class from Libraries Browser,
simulate a Class from Libraries Browser. |
| 00:23 | To record this tutorial, I am using OpenModelica version 1.9.5 and Ubuntu Linux OS 14.04 |
| 00:36 | But, the process demonstrated in this tutorial is identical in other OS such as- Windows, Mac OS X or FOSSEE OS on ARM. |
| 00:48 | To follow this tutorial, you should have knowledge of differential and algebraic equations. |
| 00:55 | What is OpenModelica? OpenModelica is an open-source modeling and simulation environment, |
| 01:03 | object-oriented, multi-domain modeling language for complex systems |
| 01:09 | intended for both industrial and academic purposes. |
| 01:15 | Let's first look at what is OMEdit. |
| 01:19 | OMEdit stands for OpenModelica Connection Editor. |
| 01:24 | It is a new Graphical User Interface for graphical model. |
| 01:29 | It has several features to create and modify the models. |
| 01:34 | Now, let me go to the OMEdit window. |
| 01:38 | I have already installed OMEdit on my system. |
| 01:43 | To open OMEdit window, click on Dash Home. |
| 01:47 | In the search bar, type: OMEdit. |
| 01:51 | Click on the OMEdit icon that is displayed. |
| 01:55 | On clicking OMEdit icon, we see the Welcome perspective window. It shows a list of Recent Files and Latest News. |
| 02:06 | On the left side of OMEdit window, we see the Libraries Browser. Here we can see a list of libraries. |
| 02:15 | Let us expand the Modelica library. |
| 02:18 | To do this, click on the arrow head to the left of Modelica library. |
| 02:23 | Here we can see list of available libraries. |
| 02:28 | Click on the arrow head to the left of Thermal library. |
| 02:31 | Under Thermal, we find HeatTransfer library. Expand it. |
| 02:37 | Once again, we see many different libraries displayed. |
| 02:43 | Now, let’s expand the Example library. |
| 02:47 | Here we can see different examples of Heat Transfer. |
| 02:52 | Let us open the class named TwoMasses. |
| 02:56 | Right click on TwoMasses and select Open Class. |
| 03:01 | We can also double-click on the class name to open the class. |
| 03:06 | Now we are in the Modeling Perspective window. |
| 03:10 | The class opens by default in Diagram View. |
| 03:14 | Don’t worry if the class doesn’t open in Diagram View. |
| 03:19 | I shall show you how to switch between different views. |
| 03:23 | On the modeling area window, we can see the Diagram View of models. |
| 03:28 | On the top of the modeling area, we see four different icons. |
| 03:33 | The first icon represents Icon View. |
| 03:37 | Click on it to see the Model representation. |
| 03:41 | The next icon represents Diagram view. |
| 03:45 | Click on it to see the diagram that represents the model. |
| 03:49 | The third icon is Text View icon. |
| 03:52 | Let’s click on it. |
| 03:54 | Here, we see the Modelica code pertaining to Two Masses class. |
| 04:00 | In upcoming tutorials, we will learn how to write code in OMEdit. |
| 04:05 | Click on the next icon which is Documentation view. |
| 04:10 | A new window named Documentation Browser opens on the right side of OMEdit window. |
| 04:17 | Here we can read the given detailed information about the model. |
| 04:23 | Now close the Documentation Browser. |
| 04:27 | Before simulating a model, we need to check for correctness of the model. |
| 04:32 | To do this, first locate Check All Models button on the toolbar. |
| 04:37 | This button has white coloured double ticks on it. Click on it. |
| 04:43 | Observe that a Messages Browser opens at the bottom of the window. |
| 04:48 | This will show messages pertaining to the Modelica class. |
| 04:53 | Now, let’s try to simulate the model. |
| 04:56 | To do this, click on green colored arrow button on the toolbar. |
| 05:02 | This is the Simulate button which is used to simulate the model. |
| 05:06 | We can also press Ctrl +B to simulate a Modelica class. |
| 05:11 | On simulating, a new window opens. |
| 05:14 | It shows the compilation process of the class. |
| 05:18 | Once the compilation is successful, the output window displays the message: |
| 05:23 | Simulation process finished successfully. Minimize this window. |
| 05:30 | By default, Plotting Perspective opens in the OMEdit window. |
| 05:35 | If it does not open, click the Plotting button at the bottom right. |
| 05:40 | We can also press Ctrl +F3 to open Plotting window. |
| 05:45 | Here we can see the simulation results of the Modelica class. |
| 05:50 | On the right of Plotting Perspective, look at the Variables Browser window. |
| 05:55 | Under Variables Browser, I will demonstrate how to change input variable values of a Modelica class. |
| 06:03 | Let’s expand the conduction variable. |
| 06:06 | Change the value of G and see how the values of Q_flow and dT change. |
| 06:13 | By default, G = 10, Q_flow = 263.599 W and dT = 26.3599 K. |
| 06:25 | Let us change the value of G, from 10 to 15 |
| 06:30 | and press Enter. |
| 06:32 | Go to the top right corner of the window. |
| 06:35 | Click Re-simulate button on the toolbar. |
| 06:39 | We get the success message window. Minimize this window. |
| 06:44 | Once simulation is completed, note the changes. |
| 06:48 | Q_flow = 203.009 W and dT = 13.5339 K. |
| 06:56 | Now, let me show you how to generate a plot. |
| 07:00 | Click on the check box against dT variable. |
| 07:04 | You can see a plot between time on X-axis and dT on Y-axis. |
| 07:11 | This plot describes the temperature difference between two masses varying with time. |
| 07:17 | By default, the simulation runs from 0 to 1 unit time. |
| 07:22 | We can vary this interval using the Simulation Setup option. |
| 07:27 | For this, go to Modeling Perspective. |
| 07:30 | Click on Modeling button at the bottom right. |
| 07:33 | Or press Ctrl +F2 to open Modeling window. |
| 07:38 | Click on Simulation Setup option on the toolbar. |
| 07:43 | Simulation Setup window opens. |
| 07:46 | Change Stop Time to 5 unit. |
| 07:49 | Ensure that Simulate check-box is checked. |
| 07:52 | Click Ok. |
| 07:55 | Immediately, we get the success message window. |
| 07:59 | Minimize this window. |
| 08:02 | The class is re-simulated with a simulation interval of 0 to 5 unit time. |
| 08:08 | We can also obtain a plot between any two variables, other than time. Let’s try that now. |
| 08:16 | Click on New Parametric Plot Window on the toolbar. |
| 08:20 | Let's select the two variables Q_flow and dT that we wish to plot. |
| 08:26 | We can now see a plot between dT on X-axis and Q_flow on Y-axis. |
| 08:34 | It shows the variation of heat flow as the temperature difference between them decreases. |
| 08:40 | Once the necessary plot is generated, we can delete the results. |
| 08:45 | In the Variables Browser, right click on TwoMasses. |
| 08:49 | Select Delete Result. The result has now been deleted. |
| 08:55 | OpenModelica has a Help menu. |
| 08:58 | Go to the Menu bar and click on Help option. |
| 09:02 | Here we can see User Guide, System, Scripting and Modelica Documentation. |
| 09:10 | Let's summarize. |
| 09:12 | In this tutorial, we have learnt about:
OpenModelica, |
| 09:16 | introduction to OMEdit, |
| 09:18 | open a Class from Libraries Browser, |
| 09:21 | simulate a Class from Libraries Browser. |
| 09:25 | As an assignment: Expand Fluid library in Modelica. |
| 09:30 | Expand Examples Library in Modelica. |
| 09:34 | Simulate HeatExchangerSimulation class in HeatExchanger Library. |
| 09:39 | Change value of few input variables and re-simulate. |
| 09:43 | Generate a plot between Q_Flow_1 and time. |
| 09:48 | Watch the video available at the following link. |
| 09:51 | It summarizes the Spoken Tutorial project. |
| 09:55 | The Spoken Tutorial Project Team: conduct workshops using spoken tutorial. |
| 10:01 | Gives certificates to those who pass an online test. For more details, please write to us. |
| 10:08 | Do you have questions in this Spoken Tutorial? Please visit this site, choose the minute and second where you have the question. |
| 10:17 | Explain your question briefly. Someone from the FOSSEE team will answer them. |
| 10:23 | The Spoken Tutorial forum is for specific questions on this tutorial. Please do not post unrelated and general questions on them. This will help reduce the clutter. |
| 10:36 | With less clutter, we can use this discussions as instructional material. |
| 10:42 | The FOSSEE team coordinates coding of solved examples of popular books. |
| 10:47 | We give honorarium and certificates for those who do this. For more details, please visit this site. |
| 10:56 | The FOSSEE team helps migrate commercial simulator labs to OpenModelica. |
| 11:02 | We give honorarium and certificates for those who do this. For more details, please visit this site. |
| 11:11 | Spoken Tutorial and FOSSEE projects are funded by NMEICT, MHRD, Government of India. |
| 11:20 | This tutorial is contributed by Kaushik Datta and Priyam Nayak.
Thanks for joining. |
