Execution Results

If the user would like to run the experimental devices online, the connection between the client side and the server side could be established first, and the experiment online item in the user interface should be chosen. When the connection is established and the item is chosen, the login system in Fig-4.2 will be shown.

Fig-4.2 Login system interface

If the login user is correct, the experiment system will provide many kinds of the experimental devices, but now the experiment system just provides one experimental device, inverted pendulum. The operation interface of inverted pendulum is shown in Fig-2.13. As the designed parameters of PID controller are filled in and submitted, the views of running the experimental device will be shown in Fig-4.3, and the user has to wait for the resulted data and figure shown in Fig-4.4.

Fig-4.3 Views of running the experimental device

Resulted data file of pendulum angle Position of Pendulum

Time deg

Chapter 5 Conclusions

The overall objective of this thesis is to develop a surrounding where the users from everywhere could run the simulation of the designed controllers and execute the actual experiment online. The users in their own places could conveniently compare with the difference between their learned skills and factual devices, and verify their designed controllers workable or not via this approach. Using this construction, main server machine and E-labs of Internet-based laboratory, the integrated system could be easily expanded and set up no matter how the distance between the main server and E-labs is. In this integrated network system, the friendly user interface is supplied to the user facilely to operate without downloading or installing any software just working on IE, the actually experimental device, inverted pendulum, is provided for the user to operate, and video server and cameras are offered the user to view.

Furthermore, the experiment results show that this integrated system works well and the inverted pendulum is controllable and executable in actual world. Finally, as following this construction of the integrated network system, the experimental devices could easily be added, and it could provide a boundless laboratory for everyone.

Constructing this integrated network system, it could be either used to provide a surrounding for the users to verify the learned skills in the online education, or could be used to upgrade or modify the products as the user who buy them from the

companies encounter some problems, and could also be used to control and monitor the electric equipments in the houses or in the factories as the master not at home or the manager not at the factories.

There are four primary future works presented below.

1. User interface of experiment online

Due to the user interface of experiment online, the controllers provided for the users to design are fixed input mode but could not change the designed parameters as the experimental devices running. It’s could design a modulated interface using JAVA Applete. Therefore, the users could immediately observe the variation of executing experimental devices as adjusting the regulator.

2. MATLAB engine

As the users run the simulation online, there is a big problem happened. If the users’ simulation codes let the system dissipated, the MATLAB engine may be down and then the other users won’t run the their simulation online. This problem is concerned with MATLAB software self, so it could not easily be solved.

3. Inverted pendulum

In inverted pendulum, the execution resulted data and figures are not very perfect, because the noises from the potentiometer, actuator, the leather belt, the rail of the cart, driver and so on will make the system not to be control well. As for the driver

and actuator, these two could be improved, but the potentiometer could change to encoder in order to reduce the noise. Here, the PC-based controller is used, but following the development of standalone system, the PC-based controller could be transformed into microprocessor controllers.

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