OpenModelica/C2/Introduction-to-OMEdit/English-timed

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.

Contributors and Content Editors

Jyotisolanki, Sakinashaikh, Sandhya.np14