How to chnage the coefficent for transfer function?

Question

Shambaven Srimurugathas 2024-2-4

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2078096-how-to-chnage-the-coefficent-for-transfer-function

评论： Sam Chak 2024-2-7

How do I change the 'deng' coefficient where it shows (s+11.17)(s+10.89)(s^2+0.033s+0.553) at the end. Trying to figure out but been stuck. Let me the changes need to made ASAP:

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。

请先登录，再回答此问题。

Answer 1

Sam Chak 2024-2-5

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2078096-how-to-chnage-the-coefficent-for-transfer-function#answer_1402676

编辑：Sam Chak 2024-2-7

在 MATLAB Online 中打开

Hi @Shambaven Srimurugathas

I believe that the following result is probably what you are seeking.

Update 2: As per what you want.

numg   = conv([1 0.37], [1 2.26]);
deng   = [ 1, 22.093, 122.92228, 16.2133429, 67.2676389];
K      =  -8;
G      = zpk(K*tf(numg, deng))
G =
 
             -8 (s+2.26) (s+0.37)
  ------------------------------------------
  (s+11.17) (s+10.89) (s^2 + 0.033s + 0.553)
 
Continuous-time zero/pole/gain model.

Update 1: There is probably a typo in the denominator in your original code.

numg   = [-0.37, -2.26];
% deng = [ 1, 22.093, 122.92228, 16.2133429, 6.72676389];   % <-- there is probably a mistake here
deng   = [ 1, 22.093, 122.92228, 16.2133429, 67.2676389];
K      =  -8;
% G    = zpk(numg, deng, K)
G      = zpk(K*tf(numg, deng))
G =
 
                2.96 (s+6.108)
  ------------------------------------------
  (s+11.17) (s+10.89) (s^2 + 0.033s + 0.553)
 
Continuous-time zero/pole/gain model.

2 个评论
显示无隐藏无

Shambaven Srimurugathas 2024-2-7

Thx for your help but the bottom dnominator coefficient is right but I want the top to show as -8(s+0.37)(s+2.26). If you know how to fix that I appreciate it.

Sam Chak 2024-2-7

Hi @Shambaven Srimurugathas

Take a look at Update 2 above. If you find the solution helpful, please consider clicking 'Accept' ✔ on the answer and voting 👍 for it. Thanks a bunch! By the way, you should also vote for other helpful answers as tokens of appreciation.

请先登录，再进行评论。

Answer 2

Hassaan 2024-2-4

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2078096-how-to-chnage-the-coefficent-for-transfer-function#answer_1402541

在 MATLAB Online 中打开

@Shambaven Srimurugathas Try this:

% Define the coefficients for the denominator polynomial
deng = [1, 22.093, 122.92228, 16.2133429, 6.72676389];
% Assuming numg and K have been defined correctly as before
numg = [-0.37 -2.26];
K = -8;
% Create the zero-pole-gain model
G = zpk(numg, deng, K);
  zpk with properties:

                Z: {[2×1 double]}
                P: {[5×1 double]}
                K: -8
    DisplayFormat: 'roots'
         Variable: 's'
          IODelay: 0
       InputDelay: 0
      OutputDelay: 0
        InputName: {''}
        InputUnit: {''}
       InputGroup: [1×1 struct]
       OutputName: {''}
       OutputUnit: {''}
      OutputGroup: [1×1 struct]
            Notes: [0×1 string]
         UserData: []
             Name: ''
               Ts: 0
         TimeUnit: 'seconds'
     SamplingGrid: [1×1 struct]

-----------------------------------------------------------------------------------------------------------------------------------------------------

If you find the solution helpful and it resolves your issue, it would be greatly appreciated if you could accept the answer. Also, leaving an upvote and a comment are also wonderful ways to provide feedback.

It's important to note that the advice and code are based on limited information and meant for educational purposes. Users should verify and adapt the code to their specific needs, ensuring compatibility and adherence to ethical standards.

Professional Interests

Technical Services and Consulting
Embedded Systems | Firmware Developement | Simulations
Electrical and Electronics Engineering

Feel free to contact me.

2 个评论
显示无隐藏无

Shambaven Srimurugathas 2024-2-4

Unfortunately its not what I want. I need to change the 'deng' coefficient say that (s+11.17)(s+10.89)(s^2+0.033s+0.553) when I run the code.

Hassaan 2024-2-4

@Shambaven Srimurugathas See @Star Strider answer below.

请先登录，再进行评论。

Answer 3

Star Strider 2024-2-4

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2078096-how-to-chnage-the-coefficent-for-transfer-function#answer_1402556

What do you want to change it to?

The displayed result is the format that the zpk function produces. If you want them otherwise, omit the zpk call, and just multiply the numerator by -8.