Ramp a variable with 63 elements

Question

David Cole 2024-8-23，23:12

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2147614-ramp-a-variable-with-63-elements

回答： Sam Chak 2024-8-24，7:00

I have a simulink variable that has 63 elements. I would like to ramp each element in the variable proportionally from 0 to the value of the variable.

For example

A = [22 17 39 ...]

B = [0 0 0 ...]

Sample time = Ts = 1e-6

B = Ramp A

Maybe I need a toolkit that has a premade ramp block that takes an input and sets upper and lower limits.

Thanks,

David

2 个评论
显示无隐藏无

Walter Roberson 2024-8-24，0:39

To check:

Do you want B to start with 0 and proceed to 22 over a fixed time, with a timestep of 1e-6? And then B should start over from 0 and proceed to 17 over a fixed time, with a timestep of 1e-6? Then B should start at 0 and proceed to 39 over a fixed time, with a timestep of 1e-6 ?

Or do you want B to start with 0 and ramp to 22 over a fixed time, with a timestep of 1e-6, followed by ramping from 22 to 17 over a fixed time with a timestep of 1e-6, then ramping from 17 to 39 over a fixed time with a timestep of 1e-6 ?

Or do you want B to become a 2D array, in which the first colum ramps from 0 to 22, the second column ramps from 0 to 17, the third column ramps from 0 to 39, all over a fixed time, so the last row would be 22 17 39 ?

David Cole 2024-8-24，1:01

Thanks for the help. I am using Specialized Power System blocks. My sample rate Ts = 1e-6. I have 63 elements that represent harmonic currents. I need to ramp the value from 0 to its maximum. The picture below is what I am trying to do. Once the values have ramped from zero to their value, the signal needs to stay at its value until I am ready to ramp it to zero at a later time. The first element will have a frequency of 60 Hz, with a period of 1/60 = 16.666e-3 second. I would like the ramp to last at least three cycles of the slowest frequency; therefore 3*16.666-3 = 49.999e-3 seconds.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2024-8-24，1:15

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2147614-ramp-a-variable-with-63-elements#answer_1504459

First option:

Use a Simulink ramp block with a vector of slopes, and with the setting of "Interpret vector parameters as 1-D" set to on (on is the default.) You might need to combine it with if/elseif and a zero-order hold block and a ramp-down block in order to get the ramp-down effect.

Second option:

Use a MATLAB Function Block with Clock as the input. Have the MATLAB Function Block implement the ramp/hold/ramp-down behaviour.