| Author |
Message |
metuor@yahoo.com
Guest
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 Posted:
Tue Nov 29, 2005 1:16 am Post subject:
Half-sine pulse |
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I need to model a shock load as a half-sine pulse, with time duration
1s and centered at 0.5 and amplitude 3000 g.
I appreciate your help
Thank u. |
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Jerry Avins
Guest
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| Posted:
Tue Nov 29, 2005 8:03 am Post subject:
Re: Half-sine pulse |
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metuor@yahoo.com wrote:
| Quote: | I need to model a shock load as a half-sine pulse, with time duration
1s and centered at 0.5 and amplitude 3000 g.
|
So? You just specified it. What do you need to know? The frequency is
1/2 cycle per second, or pi radians/second. The time range and peak
values are specified. What's the problem?
Jerry
--
Engineering is the art of making what you want from things you can get.
ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ |
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metuor@yahoo.com
Guest
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| Posted:
Tue Nov 29, 2005 8:46 am Post subject:
Re: Half-sine pulse |
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The problem is that i dont know how to write the program
thanks |
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Fred Marshall
Guest
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| Posted:
Tue Nov 29, 2005 9:16 am Post subject:
Re: Half-sine pulse |
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"metuor@yahoo.com" <Muneeb.Arrabi@gmail.com> wrote in message
news:1133238947.703256.220200@f14g2000cwb.googlegroups.com...
| Quote: | Here is the problem i want to model this shock load as an input in
nonlinear differential equation and to solve it, I reed the Matlab help
files and I found "gauspuls " function which could be used to model
the shock load but it keeps the pulse centered in the origin, I need to
move it to 0.5, pleas if you know any other way to model the pulse load
let me now "as u can I am not very good in using Matlab"
|
Matlab seems to be the least of your worries.
Consider this:
Sequences are stored in arrays / vectors
Those arrays / vectors naturally have indices
Those indices can relate to coordinates in time, space, etc.
You are indexing things in time.
You get to decide where in an input vector where t=0 resides.
Your decision will affect time registration thereafter.
Example: a gate pulse with various time registrations:
g=[0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 0 0 0 0 0]
the gate center is at index 13.
Since Matlab uses index "1" for the first element, if you align the first
element with t=0 then a scaled time array corresponding to g would be:
t=[0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19]
Example: a gate pulse centered at zero:
g=[1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
t=[-2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17]
Example: a gate pulse centered at zero:
g=[0 0 0 0 0 1 1 1 1 1 0 0 0 0 0]
t=[-7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7]
The problem you're having with gauspuls is probably that the T vector you're
creating starts at t=0. Try it starting at t=-0.01 or some such value.....
Then, you can redefine the value of t along the gauspuls indices any way you
like.
fred |
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dbell
Guest
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| Posted:
Tue Nov 29, 2005 9:16 am Post subject:
Re: Half-sine pulse |
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What can you say?
Dirk |
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Jerry Avins
Guest
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| Posted:
Tue Nov 29, 2005 9:16 am Post subject:
Re: Half-sine pulse |
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metuor@yahoo.com wrote:
| Quote: | The problem is that i dont know how to write the program
|
What program" Language? Platform? Once you write it, what do you do with
it? I think there is more problem than you realize.
Jerry
--
Engineering is the art of making what you want from things you can get.
ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ |
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metuor@yahoo.com
Guest
|
| Posted:
Tue Nov 29, 2005 9:16 am Post subject:
Re: Half-sine pulse |
|
|
Here is the problem i want to model this shock load as an input in
nonlinear differential equation and to solve it, I reed the Matlab help
files and I found "gauspuls " function which could be used to model
the shock load but it keeps the pulse centered in the origin, I need to
move it to 0.5, pleas if you know any other way to model the pulse load
let me now "as u can I am not very good in using Matlab" |
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| Back to top |
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meteor
Guest
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| Posted:
Tue Dec 06, 2005 1:16 am Post subject:
Re: Half-sine pulse |
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I solved the problem using a combination of the sin and unit step
function
Thanks you anyway. |
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meteor
Guest
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| Posted:
Tue Dec 06, 2005 1:16 am Post subject:
Re: Half-sine pulse |
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I solved the problem using a combination of the sin and unit step
function
Thanks you for your time |
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