Comments on: How to draw ODEs in Simulink http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/ This blog is about Simulink. Sun, 22 Nov 2009 23:21:02 +0000 http://wordpress.org/?v=2.3.1 By: valio http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/#comment-834 valio Wed, 26 Aug 2009 20:04:08 +0000 http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/#comment-834 Hmmm.. Here please: http://img220.imageshack.us/img220/5176/212d.jpg Hmmm..

Here please: http://img220.imageshack.us/img220/5176/212d.jpg

]]> By: valio http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/#comment-833 valio Wed, 26 Aug 2009 20:02:35 +0000 http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/#comment-833 Hello Seth! I rebuild all as you advised: <a href="http://img220.imageshack.us/i/212d.jpg/" rel="nofollow"></a> but it wasnt help to avoid problems: "Trouble solving algebraic loop.." as obvious on picture. Hello Seth!

I rebuild all as you advised:

but it wasnt help to avoid problems:
“Trouble solving algebraic loop..”
as obvious on picture.

]]> By: Dujing http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/#comment-701 Dujing Tue, 03 Mar 2009 03:18:34 +0000 http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/#comment-701 Thanks!It's useful for me! Thanks!It’s useful for me!

]]> By: Domek http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/#comment-579 Domek Fri, 17 Oct 2008 17:57:23 +0000 http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/#comment-579 Great info! Will come handy one day. All students will be thankful. Great info!
Will come handy one day. All students will be thankful.

]]> By: RAMYA http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/#comment-517 RAMYA Fri, 29 Aug 2008 12:49:59 +0000 http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/#comment-517 sir, am pursuing my masters in communication engineering. i am finding some difficult in implementing a block given in my paper, using simulink. Dynamic simulation of MEMS switches using Simulink® I VE ATTACHED THE PAPER FOR UR CONVENIENCE. PLEASE HELP ME IN IMPLEMENTING THE EQUATIONS AND BLOCKS IN SIMULINK. EXPECTING A POSITIVE REPLY FROM YOU AT THE EARLIEST SIR.. D. J. Combes, K. M. Brunson and R. J. T. Bunyan QinetiQ Malvem, St Andrews Road, Malvem, Worcestershire, WR14 3PS ABSTRACT: A nodal model is implemented in Simulink and used to investigate the dynamics of electrostatically actuated MEMS switches. The model is based on reduced order 4DOF beam elements, with electrostatic forces based on simple parallel plate approximations at each node. Hard stops and contact stiction conditions are implemented. Using this model, the role of dynamic forces in overcoming contact stiction in MEMS switches is investigated. For an example MEMS switch, the relationship between the design of the switch, the strain energy under actuation and the dynamic restoring force are discussed. Dynamic forces are found to play a highly significant role in overcoming contact stiction. Keywords: MEMS switch, Simulink, Dynamic model, Stiction force GOD... AM UNABLE TO COPY THE BLOCK SETH... sir,
am pursuing my masters in communication engineering. i am finding some difficult in implementing a block given in my paper, using simulink. Dynamic simulation of MEMS switches using Simulink® I VE ATTACHED THE PAPER FOR UR CONVENIENCE. PLEASE HELP ME IN IMPLEMENTING THE EQUATIONS AND BLOCKS IN SIMULINK. EXPECTING A POSITIVE REPLY FROM YOU AT THE EARLIEST SIR..
D. J. Combes, K. M. Brunson and R. J. T. Bunyan
QinetiQ Malvem, St Andrews Road, Malvem, Worcestershire, WR14 3PS
ABSTRACT:
A nodal model is implemented in Simulink and used to investigate the dynamics of electrostatically actuated MEMS switches. The model is based on reduced order 4DOF beam elements, with electrostatic forces based on simple parallel plate approximations at each node. Hard stops and contact stiction conditions are implemented. Using this model, the role of dynamic forces in overcoming contact stiction in MEMS switches is investigated. For an example MEMS switch, the relationship between the design of the switch, the strain energy under actuation and the dynamic restoring force are discussed. Dynamic forces are found to play a highly significant role in overcoming contact stiction.
Keywords: MEMS switch, Simulink, Dynamic model, Stiction force
GOD… AM UNABLE TO COPY THE BLOCK SETH…

]]> By: Mapa Ustka http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/#comment-466 Mapa Ustka Wed, 06 Aug 2008 10:47:19 +0000 http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/#comment-466 Nice Blog!Very good Blog! Nice Blog!Very good Blog!

]]> By: Muralidhar M http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/#comment-427 Muralidhar M Wed, 16 Jul 2008 09:26:30 +0000 http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/#comment-427 Hi Seth, The post on ODE was excellent...can we have a similar post on "Difference equations" and also on "partial differential equation". Thanks! Murali Hi Seth,

The post on ODE was excellent…can we have a similar post on “Difference equations” and also on “partial differential equation”.

Thanks!
Murali

]]> By: Wenting http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/#comment-265 Wenting Fri, 30 May 2008 22:58:55 +0000 http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/#comment-265 Hi Seth, I am trying to find a saddle path backwards from the equilibrium as it is very difficult for me to know the exact initial values on the saddle path for my four dimensional ODE system. I tried to use the code tspan=[T 0] instead of [0 T] (T could be any number) when I draw the graph.And I did not change the ODE system. The result turned out to be strange as it seemed that the system always stayed at the equilibrium point while it supposed to be a saddle point. My question is that do I need to add "-"(minus) in front of my ODE system as well? Or is there other advice? Many thanks! Hi Seth, I am trying to find a saddle path backwards from the equilibrium as it is very difficult for me to know the exact initial values on the saddle path for my four dimensional ODE system. I tried to use the code tspan=[T 0] instead of [0 T] (T could be any number) when I draw the graph.And I did not change the ODE system. The result turned out to be strange as it seemed that the system always stayed at the equilibrium point while it supposed to be a saddle point. My question is that do I need to add “-”(minus) in front of my ODE system as well? Or is there other advice? Many thanks!

]]> By: wei http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/#comment-256 wei Tue, 27 May 2008 16:11:21 +0000 http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/#comment-256 Hi Daniel, There are several choices from "user-defined functions" group of the Simulink library. Hi Daniel,
There are several choices from “user-defined functions” group of the Simulink library.

]]> By: Daniel http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/#comment-245 Daniel Sat, 24 May 2008 02:27:33 +0000 http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/#comment-245 Hey Seth I've been trying to learn some Simulink and was glad MathWorks now has a Simulink blog! In relation to your post, what you recommend if my 'kx' is substituted with a 'f(x)' where we have non-linear stiffness. Currently I have it to substitute the gain block with a look up table. Are there other alternatives or suggestions? Should I be using the time varying transfer fcn blocks instead? Hey Seth I’ve been trying to learn some Simulink and was glad MathWorks now has a Simulink blog!

In relation to your post, what you recommend if my ‘kx’ is substituted with a ‘f(x)’ where we have non-linear stiffness. Currently I have it to substitute the gain block with a look up table. Are there other alternatives or suggestions? Should I be using the time varying transfer fcn blocks instead?

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