Muna Shehan

UPM

Active since 2014

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Professional Interests: Optimization Structure

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If I have acceleration values in a vector can i transfer them to a displacement?
Hi all; I have a vector which has a data that represent acceleration values ( these values I read it from accelerometer) Is the...

6 years ago | 1 answer | 0

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Can I zoom an area in Bode magnitude diagram?
Hi everyone; I have a bode magnitude diagram but i need to zoom the first peak point on the same bode magnitude diagram. Thanks...

7 years ago | 1 answer | 0

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answer

Question

is it possible to use step for a state space dynamic system with multi input?
Hi all I have a dynamic system with |A, B, C, and D| that identify the state space model, this system has two inputs one is a c...

7 years ago | 1 answer | 0

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Question

Is it possible there is a lack information in the matlab example?
Hi all; Can any one explain to me what is the value of |r| and |fs| that used in |B| matrix and qcar.InputName in the matlab e...

7 years ago | 0 answers | 0

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answers

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Is it possible to transform a damping sine wave signal in time domain to frequency domain by using fft?
Hi all; I have a 1001 discrete data vector, which it gives a damped sine wave. I need to transform time-domain data to frequenc...

7 years ago | 0 answers | 0

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answers

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How i can determine sinusoid frequency ?
Hi; Pleas can anyone explain how i can determine sinusoid frequency if I have a step response where the data form is two vector...

7 years ago | 2 answers | 0

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answers

Question

Why I could not convert time domain to frequency domain data?
Hi all; i try tho covert the time domain to frequency domain by using fft function, but the acceleration vs Frequency plot is i...

7 years ago | 0 answers | 0

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Question

Can I plot the acceleration vs frequency
Hi all, I used Matlab to plot the acceleration vs time, where the acceleration and time are two vectors. Can I plot the accelera...

7 years ago | 2 answers | 0

2

answers

Question

can i convert a time domain to frequency domain?
<</matlabcentral/answers/uploaded_files/70973/acc_t.jpg>> Hi all, I have a dynamic system with one input and four state var...

7 years ago | 1 answer | 0

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Question

Hi all, what is the units of stepinfo.SettlingTime. Regards
I have a confused about |stepinfo.SettlingTime| units because the |doc| did not mention the units. kindly can any on explain tha...

7 years ago | 1 answer | 0

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Question

what is the difference between global search exit messages?
Hi all; can any one explain what is the difference between these two exit messages when I use |global search|. Regards The fir...

7 years ago | 0 answers | 0

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Question

Why the myfunction return zero elements?
Hi all; I have a function which should return a |R_gradient| matrix. I identify its elements but when I call |myfunction| it re...

8 years ago | 2 answers | 0

2

answers

Question

Why I get index out of bounds error even though I debug the loop and its Ok
Hi all I try to optimize three variables using |fmincon|. Inside the objective function there is a loop which the error message ...

8 years ago | 1 answer | 0

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Question

Can I store ode23 the function handle parameters?
Hi all; I use ode23 to solve the ordinary differential equations [t02,y] = ode23(@(t,x)f(t,x,F,kc, @(t)lookup_u(zdot,t)...

8 years ago | 0 answers | 0

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Question

Why fmincon did not work when it is provided with gradient
Hi all; I have a problem with two variables. If the objective function is quadratic and subjected to boundary constraints and dy...

8 years ago | 1 answer | 0

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Question

how to read a function handle parameter when i use ode23
Hi all; I use |ode23| to solve the ordinary differential equations in the form. [~,y] = ode23(@(t,x)f(t,x,0, kc, @(t)lo...

8 years ago | 1 answer | 0

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Question

Hello all, how I can solve ODE simultaneously with fmincon?
I have a system subject to ordinary differential equations (ODE) which are the linear equality constraints and at the same tim...

8 years ago | 0 answers | 0

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Question

Can I use fmincon for quadratic objective function with linear constraints without gradient and hessian matrices
Hi all; I use |fmincon| to solve an objective function (quadratic) for a dynamic system which is subject to a set of linear co...

8 years ago | 0 answers | 0

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answers

Question

Hi all; I have a problem to run R2016a example due to different Matlab version.
I used Matlab |R2011a|, when i try to implement Matlab example ( from |R2016| Documentation) <http://www.mathworks.com/help/...

8 years ago | 1 answer | 0

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Question

Hi all; I try to use fmincon in order to find the optimal control force F for an active suspension system, every time I run fmincon, F and the objective function did not change. Kindly, can any on explain to me why I get this problem. Thanks
Where the system is a dynamic system and it is subjected to the equation of motion. The objective function is determined based o...

8 years ago | 3 answers | 0

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Question

Hi ; i try to implement a matlab example in the link http://www.mathworks.com/help/robust/gs/active-suspension-control-design.html but i got a message error. so kindly can any one explain why i got this error since i just implement the publishe code
mb = 300; % kg mw = 60; % kg bs = 1000; % N/m/s ks = 16000 ; % N/m kt = 190000; % N/m A = [ 0 1 0 0; ....

8 years ago | 1 answer | 0

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Question

Hi all; when i run the optimtool i got this message error: ( Optimization running. Error running optimization. Inner matrix dimensions must agree.) so kindly can any one explaine what is the problem
I try to use optimtool (fmincon) to find the optimal values for two variable(x1,x2), I use SQP as the algorithm, the start point...

8 years ago | 1 answer | 0

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Question

Hi all, i try to use interp1 function. but i have two data input (Y), the values of the underlying function , one of them is a vector while the other is constant value. so how i can deal with Y
yi = c(x,Y,xi)

8 years ago | 1 answer | 0

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answer

Question

scale model for dynamic system
Hi, I have a case study ( active suspension system) which consists of many parameters and my aim is to construct an experimenta...

8 years ago | 0 answers | 0

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answers

Question

Hi, is there a function that calculate the natural frequency for the system if the stiffness and mass matrices is available. Thanks
Hi, is there a function that calculate the natural frequency for the system if the stiffness and mass matrices is available. Tha...

8 years ago | 1 answer | 0

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answer

Question

The objective function is increased rather than decreased when fmincon is used
Dear all, I used fmincon to solve an optimization problem. Interior-point algorithm was used with TolFun=-4. The question is: ...

9 years ago | 1 answer | 0

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Question

Interior-point algorithm vs SQP algoritm
Hi, I am running an optimal design problem by using fmincon with sqp algorithm and interior-point algorithm. SQP algorithm was ...

9 years ago | 1 answer | 0

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Question

Feasibility column diverge from TolCon
Hi, i tried to use fmincon (interior-point algorithm) to solve quadratic integral problem which is subject to linear and nonlin...

9 years ago | 0 answers | 0

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answers

Question

Hi, i had downloaded a code from a file exchange. This code is run efficiently in the first computer. When I tried to execute the same code in another computer I faced an error message. The code is used fmincon function and the error message is
fmincon stopped because the size of the current step is less than the default value of the step size tolerance but constraints a...

9 years ago | 0 answers | 0

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answers

Question

Providing SVM classifier algorithm
Hello dear friends, Can anyone provide me the SVM algorithm used in MATLAB as a flowchart of steps. An academic resource availa...

9 years ago | 0 answers | 0

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answers

Muna Shehan

UPM

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