Why I am not getting sample time in the discrete transfer function block.

Question

Gokula Krishnan Velmurugan 2023-10-13

2
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2033139-why-i-am-not-getting-sample-time-in-the-discrete-transfer-function-block

回答： Pam 2024-9-16

Hi

I am wokin on the transfer fuction block to model the dyamic syatem of the aircraft. But durin the modeling i have noticed that there is no sample time space to enter the value.

How can I enter the sample time in the discrete transfer fucntion block.

3 个评论
显示 1更早的评论隐藏 1更早的评论

CESAR MONTES SANCHEZ 2023-12-28

thank you @Abdulhakeem it was a great soution!!

Deepak Shankar 2024-2-18

Thanks for this solution @Abdulhakeem

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Ragheed 2024-3-7

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2033139-why-i-am-not-getting-sample-time-in-the-discrete-transfer-function-block#answer_1422366

It seems that the option has been obscured in new releases (I'm using 2023b and I have the same issue).

I was able to solve the issue by going to Model Explorer then selecting "Show Details" while the "Discrete Transfer Fcn" is selected.

This then prompts you with a set of properties from which you can search "SampleTime" and select the blue arrow to add it to the block's properties.

Once added, you can hide the details and set the "SampleTime" to "Ts" or whatever value you want.

You can then double-click on the Discrete Transfer Fcn block and check that the parameter is there.

I hope this helps.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

Paul 2023-10-14

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2033139-why-i-am-not-getting-sample-time-in-the-discrete-transfer-function-block#answer_1333084

编辑：Paul 2023-10-14

Hi Gokula,

The Discrete Transfer Fcn block is one of the Blocks for Which [Setting] Sample Time Is Not Recommended. Instead, Simulink prefers this block to inherit its sample time from the input signal.

From the linked doc pages, it sounds like if you intentionally change the sample time from inherited (-1), using set_param (or maybe Model Explorer), the Sample Time parameter will then become visible in the Block Parameters dialog. But, again, it's recommended to leave it at -1, which is the default.

It seems like this change in the Block Parmeters Sample Time visibility is a relatively new development. I see the Sample Time parameter in R2022a.

6 个评论
显示 4更早的评论隐藏 4更早的评论

Jim Lynch 2023-11-20

It appears in other library blocks, too. Here is the Discrete Filter:

Paul 2023-11-20

As indicated above, it seems like the online training is out of sync with a change to Simulink that occurred sometime after R2022a.

If there is a problem with the online training you'll get more traction on a solution by contacting TMW directly rather than posting here, though posting here for informational purposes makes sense.

I don't know if that's a normal Tech Support request or if the online training has its own support. If you submit a normal Tech Support request I'm sure they'll point you in the right direction if they don't deal with the online training.

请先登录，再进行评论。

Answer 3

Pablo 2024-5-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2033139-why-i-am-not-getting-sample-time-in-the-discrete-transfer-function-block#answer_1455691

@Ragheed

It's been very useful the data provided but every time I have to add a new block of discrete transfer function it goes away and it doesn't ask the sample time. Do you know any way of making it permanent?

Thank you so much for your support