Generate a variable sine wave during simulink simulation

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Dani Tormo
Dani Tormo 2013-1-14
评论： Vaibhav Banajwade 2016-12-15
Hi,
I want to generate a sine which amplitude and delay is changing during a simulation.
From this formula:
out = M * sin(2*pi*50*t + (pi*phi/180)))
I want to change M and phi.
I've tried to generate it using blocks but I am stucked in the sine part. I've tried using a gain but it gives me an error.
The perfect solution for me will be to use the sine wave block and change the variables on the block through an external variable.
Many thanks.

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Kaustubha Govind
Kaustubha Govind 2013-1-14
The Sine Wave block from the Simulink>Sources library does not accept any inputs, so you cannot use this block to change 'M' and 'phi' as you intend. Instead, you should use the MATLAB Function block to implement the same equation while accepting 'M' and 'phi' as inputs to the block.
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Guy Rouleau
Guy Rouleau 2013-1-15
Thanks for sharing the image, that's what I meant. One minor suggestion. You can replace the Product and 1/360 Constant by a Gain block. This will not have significant effects on your small model, but in general the less blocks in a model the better it is. This is especially true on the update time.
Vaibhav Banajwade
Vaibhav Banajwade 2016-12-15
Thank you for the answer. I was also looking for it. But I didn't understand why the "clock" is used.

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