Author Topic: Request for Java gimbal simulation.  (Read 45898 times)

egabev

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Request for Java gimbal simulation.
« on: January 29, 2011, 07:58:54 am »
Dear Mr. Fu-Kwun Hwang,
I have just subscribed for your forum. Thank you. I am looking for a suitable Java applet which can simulate gimbal movements. I need such a simulator to study the movement of HIV (the virus causing AIDS) when reaching close to the target cell (CD4+ T cell).  Some information on our research and personal details as well you can obtain visiting my site included  in my address at the bottom.
I have tried to find such Java software in your site and the links there but I failed. In this regard I would greatly appreciate if you be so kind as to create and provide me with such simulator. Please have some ideas of the design (actually the layout) at the links below.

Thanking you very much in advance I am,
Sincerely yours,
Evgeni Gabev.

Gimbal links.

http://science.howstuffworks.com/gimbal1.htm
and

http://www.google.com/images?um=1&hl=bg&rls=com.microsoft:bg:IE-SearchBox&tbs=isch:1&&sa=X&ei=DPpATZfINMzB8QPMhcyEBA&ved=0CDEQBSgA&q=gimbal&spell=1&biw=1132&bih=666
and

http://en.wikipedia.org/wiki/Gimbal

 

My address:
Assoc. Prof. E. Gabev MD, PhD
Institute of Experimental Pathology and Parasitology,
Bulgarian Academy of Sciences,
Acad. G. Bontchev street, Bl. 25,
Sofia 1113,
Bulgaria.
email: egabev@gmail.com
Internet site: http://sites.google.com/site/gabevshivaidstreatment/
Telephone: +3592/9792325,
Fax: +3592/8710107.
The simplest ideas are always the hardest to come up with.

 


Fu-Kwun Hwang

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Re:Please provide model and parameters for your gimbal system
« Reply #1 on: January 29, 2011, 11:02:51 am »
I need to have a physics model in order to create the simulation.

Do you have the model in mind?

I found some model at http://epubl.ltu.se/1653-0187/2007/086/LTU-PB-EX-07086-SE.pdf
Does the model in that pdf fit with your need?
You also need to provide values for all the parameters so that the simulation can fit with the need of your system.

egabev

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Re:Please provide model and parameters for your gimbal system
« Reply #2 on: January 29, 2011, 01:00:08 pm »
I need to have a physics model in order to create the simulation.

Do you have the model in mind?

I found some model at http://epubl.ltu.se/1653-0187/2007/086/LTU-PB-EX-07086-SE.pdf
Does the model in that pdf fit with your need?
You also need to provide values for all the parameters so that the simulation can fit with the need of your system.

Dear Mr. Fu-Kwun Hwang,
Thank you very much for your reply and for your efforts to find a model for my gimbal request to you. Actually I need something more simple than that in the Masters Thesis (the .pdf file you sent to me). This is actually a gimbal  with a gyroscope inside for the purpose of stabilization some systems, e.g.digital moove cameras etc. I need just a 3 circle gimbal (no gyroscopeinside) with one common axis (please see the attached figures) and to have the ability to move them independently having a meter for the rotation angle. Here below is a model which is OK for me but as you can see I can not use it. http://www.eng.auburn.edu/users/jzd0009/matlab/doc/help/toolbox/physmod/mech/gimbal.html
The controls I need are: Start/Stop, Restart, Reset and the most important is the ability to rotate and to position the 3 circles as it is shown on the attached pictures. Please use the words Pitch, Roll and Yaw as they are written on the pictures for the type and direction of the rotation. The mathematics is given at: http://en.wikipedia.org/wiki/Gimbal_lock
Please note that I am not a mathematcian and might be I am wrong giving you this matrices. Wishing you a nice weekend I am with kindest regards. PS. I will of course site your name and site in my publications using your applet.

Fu-Kwun Hwang

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Re: Request for Java gimbal simulation.
« Reply #3 on: January 29, 2011, 05:41:07 pm »
Let me make sure one thing:
Please provide the following information:

1. Dimension of the system (at least r1,r2,r3)
2. Does the outer most one can only rotate in YAW AXIS?
3. Is it a static system, only need to be able to set the angle for Pitch, Roll and Yaw angle?
Or there is(are) initial angualr velocity for a dynamic system? What are those values? What are the differential equations according constraints for your system.

Because I have never play with such device before, I do not have any ideas about the physics model (constraints) for the system. I need physics model to create the simulation.

The rotation axes for the following two images are not the same. Which one is similar to your gimbal?



The following is a static version. Click

Full screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
  • Please feel free to post your ideas about how to use the simulation for better teaching and learning.
  • Post questions to be asked to help students to think, to explore.
  • Upload worksheets as attached files to share with more users.
Let's work together. We can help more users understand physics conceptually and enjoy the fun of learning physics!
to view it.

egabev

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Re: Request for Java gimbal simulation.
« Reply #4 on: January 31, 2011, 07:39:48 am »
Dear Mr. F-Kwun Hwang,
Huge thanks for the static version of the gimbal applet. That is exactly what I need for doing my research. I actually do not need animation.
But I would like to ask you to add the following opportunities:Independent moving of each circle (Roll, Jaw and Pitch) without driving the others. Also please make the rotation angels of the same circles measured in degrees and please put 3 indicators to display the degree of rotation of each one. I also need that it will be possible to work with only 2 of the circles let say just Yaw and Pitch for example.The 3rd could be made (temporary) disabled and invisible from the applet by some kind of a button. This ability should be possible for each one of the 3 circles one each at a time by choice of the opperator. Actually I would like to investigate when a gimbal lock will appear with 2 and/or 3 circles in different experiments.

The gimbal lock on my humble oppinion is a constrain of the gimbal toolls at all. The equasions of the so called gimbal lock and detailed explanation of this phenomenon are given at the following sites ordered by importance:

http://en.wikipedia.org/wiki/Gimbal_lock

http://www.edharriss.com/tutorials/tutorial_xsi_gimbal/xsi_gimbal.html


http://www.anticz.com/eularqua.htm

Please excuse me that I can not give you a physics model and other constraint mathematics but I am a medical doctor and have only basic knowledge on that matter obtaining from the Internet sites. That is the reason of my request because I can not make such an applet by myself despite the EJS. I can just opperate it.
Here are my answers of you questions below:
1/,The dimension of the system shoud be in degrees not in radians or arbitrary units
2/. Yes all 3 circles Yaw, Roll and Pitch should rotate in their one axis without moving the other one i.e. when I rotate the Pitch the Jaw and Roll should not move. Then I will need to rotate the othe 2 one at a time with changin the position of the rest circles. The axes should be perpendicular each other.
3/. This static applett is OK with my work.
4/. The left hand picture is my gimbal (the blue one). The animated one is not correct for my purposes.

Thanking you very much again  for your time and efforts I am,
With kindest regards,
Evgeni.




Let me make sure one thing:
Please provide the following information:

1. Dimension of the system (at least r1,r2,r3)
2. Does the outer most one can only rotate in YAW AXIS?
3. Is it a static system, only need to be able to set the angle for Pitch, Roll and Yaw angle?
Or there is(are) initial angualr velocity for a dynamic system? What are those values? What are the differential equations according constraints for your system.

Because I have never play with such device before, I do not have any ideas about the physics model (constraints) for the system. I need physics model to create the simulation.

The rotation axes for the following two images are not the same. Which one is similar to your gimbal?



The following is a static version

Fu-Kwun Hwang

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Re: Request for Java gimbal simulation.
« Reply #5 on: January 31, 2011, 03:57:06 pm »
May be the following is what you need!

Click

Full screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
  • Please feel free to post your ideas about how to use the simulation for better teaching and learning.
  • Post questions to be asked to help students to think, to explore.
  • Upload worksheets as attached files to share with more users.
Let's work together. We can help more users understand physics conceptually and enjoy the fun of learning physics!
to view it.

egabev

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Re: Request for Java gimbal simulation.
« Reply #6 on: January 31, 2011, 07:34:47 pm »
May be the following is what you need!

Dear Mr. Fu-Kwun Hwang,
I can not open the file ejsuser/2/ejs_glimbal3.jar not found
Please advise me how to proceed. Could you please make the new applet visible.Thank you.
With best regards,
Evgeni.

Fu-Kwun Hwang

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Re: Request for Java gimbal simulation.
« Reply #7 on: January 31, 2011, 11:00:41 pm »
It is updated now.  :D

egabev

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Re: Request for Java gimbal simulation.
« Reply #8 on: February 01, 2011, 01:03:22 am »
May be the following is what you need!

Dear Mr. Fu-Kwun Hwang,

Thank you very much again. That is really the applet I need. You and your team are very, very kind and are superior experts in programming. I wish you, your familly and your team all the best during the New 2011 Year.

With best regards,
Evgeni.

egabev

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Re: Request for Java gimbal simulation.
« Reply #9 on: May 15, 2011, 12:48:32 pm »
It is updated now.  :D

Dear Professor Fu-Kwun Hwang,

May I ask you kindly to update the gimbal java applet as such that the Roll ring (blue) is rotated accorging to the Roll of the figure from the attached file. At present it is rotated as the red one (Yaw) of your applet. Thanking you very much in advance I am, Sincerely yours,
Evgeni Gabev.

Fu-Kwun Hwang

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Re: Request for Java gimbal simulation.
« Reply #10 on: May 16, 2011, 05:31:06 pm »
There were two simulations created, are you asking for the third one?

Or you want to modify one of them? May I know which one: message #4 or message#6?

egabev

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Re: Request for Java gimbal simulation.
« Reply #11 on: May 17, 2011, 02:30:29 am »
There were two simulations created, are you asking for the third one?

Or you want to modify one of them? May I know which one: message #4 or message#6?

I would like that you modify the applet on message #6. Just the blue ring rotation. Thank you.

egabev

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Re: Request for Java gimbal simulation.
« Reply #12 on: May 29, 2011, 09:40:16 am »
There were two simulations created, are you asking for the third one?

Or you want to modify one of them? May I know which one: message #4 or message#6?

I would like that you modify the applet on message #6. Just the blue ring rotation. Thank you.
Dear Professor Fu-Kwun Hwang,
I would like to asking you very kindly to modify your aplet (message #6) such that the blue ring (roll) rotates like as at the attached file direction (arrow) from today, i.e. different than the red (Yaw) and green (Pitch) one. I would greatly appreciate your efforts since I need your aplet for very serious research-a new drug for AIDS we have created in the Institute. If you agree I will give credits for your labor in the paper I am preparing at present. Thanking you very much in advance I am with kindest regards.
« Last Edit: May 29, 2011, 09:50:52 am by egabev »

egabev

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Re: Request for Java gimbal simulation.
« Reply #13 on: June 21, 2011, 08:44:01 am »
There were two simulations created, are you asking for the third one?

Or you want to modify one of them? May I know which one: message #4 or message#6?

I would like that you modify the applet on message #6. Just the blue ring rotation. Thank you.
Dear Professor Fu-Kwun Hwang,
I would like to asking you very kindly to modify your aplet (message #6) such that the blue ring (roll) rotates like as at the attached file direction (arrow) from today, i.e. different than the red (Yaw) and green (Pitch) one. I would greatly appreciate your efforts since I need your aplet for very serious research-a new drug for AIDS we have created in the Institute. If you agree I will give credits for your labor in the paper I am preparing at present. Thanking you very much in advance I am with kindest regards.
Dear Professor Fu-Kwun Hwang,
I apologize for bothering you again. I understand that you are very busy and are not able to modify the applet from #6 at that time. I have downloaded and installed EJS and try to work it out the problem but failed. Would you please be so kind as to give me your instruction steps and advice how to do it. I need just to change the rotation axes of the Roll (blue ring) as to be different than the other 2 (Yaw and Pitch). I beg you very kindly. Thanking you very much in advance I am, Sincerely yours. Evgeni Gabev.

Fu-Kwun Hwang

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Re: Request for Java gimbal simulation.
« Reply #14 on: June 22, 2011, 05:24:57 pm »
I am sorry that I was not able to help you during the last few weeks. It was near the end of semester and there are many duty need to be carry out. I will have more free time during the summer. I will try to help when I am free.