Ayisha Nayyar

Last seen: 6 months ago | Active since 2018

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Can we download Predictive maintenance toolbox for free, and is it compatible with MATLAB 2017a?
Can we download Predictive maintenance toolbox for free, and is it compatible with MATLAB 2017a?

10 months ago | 2 answers | 0

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Question

Hi all, I want help regarding loops in MATLAB, such that each iteration take values from a data set with the step size of 5? Which loop is most suitable?
Hi all, I want help regarding loops in MATLAB, such that each iteration take values from a data set with the step size of 5? Whi...

6 years ago | 1 answer | 0

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Question

Dear All, i want to curve-fit a signal in parts/ short intervals and then combine them to obtain the whole signal. I am using NLLS, Levenberg algorithm in curve-fitting toolbox (MATLAB), please guide me
Dear All, i want to curve-fit a signal in-parts (short intervals) and then combine them to obtain the whole signal. I am using N...

6 years ago | 0 answers | 0

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answers

Question

Hello, i have a log spectrum of a signal, to convert it into complex signal, used "exp" command of matlab. Now i want to convert the complex signal into time domain, i used ifft, but the answer is NaN, why?
Hello, i have a log spectrum of a frequency domain signal, to convert it into complex signal, used "exp" command of matlab. Now ...

6 years ago | 0 answers | 0

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Question

Dear all, I have a response signal in time domain, taken from an accelerometer, attached on a damaged beam. The problem is to do damage detection by using output only technique, i.e. Cepstrum analysis. I have evaluated cepstrum signal.
Dear all, I have a response signal in time domain, taken from an accelerometer, attached on a damaged beam. The problem is to do...

6 years ago | 0 answers | 0

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Question

Dear all, i need help in operational modal analysis.
I want to perform Operational modal analysis through cepstrum. Please help me out. Send some code in matlab.

6 years ago | 0 answers | 0

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Question

Cepstrum analysis in condition monitoring of structures
Hi, everyone. I am using cepstrum analysis, for output only vibration analysis of structures for damage detection. I have time ...

6 years ago | 0 answers | 0

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answers

Question

Hi, How to apply LOG (laplacian Gaussian filter) on mode shapes?
Hi, How to apply LOG (laplacian Gaussian filter) on mode shapes?

7 years ago | 0 answers | 0

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answers

Question

Hi everyone, please help me out in modalfit command for modal parameter extraction. Why mode shape vector plot is so erratic?
Hi everyone, please help me out in modalfit command for modal parameter extraction. Why mode shape vector plot is so erratic?

7 years ago | 0 answers | 0

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answers

Question

Hi experts of matlab! I am in a query, performing modal analysis on a beam, by using vibration analysis function of matlab. I am using modalfit command, the question is that, how to plot the mode shape vectors (ms), evaluated from this command?plz
Hi experts of matlab! I am in a query, performing modal analysis on a beam, by using vibration analysis function of matlab. I am...

7 years ago | 0 answers | 0

0

answers

Question

Hi every body, can any one help me out to tell that how to apply quadrature picking method for modal parameter extraction on a frf matrix?
Hi every body, can any one help me out to tell that how to apply quadrature picking method for modal parameter extraction on a f...

7 years ago | 0 answers | 0

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answers

Question

Dear helpers, i have obtained some mode shape vectors from modalfit command, how to plot them? as i am getting correct natural frequencies but modes obtained by peak picking method are not correct (plot shows that)???please help.
Dear helpers, i have obtained some mode shape vectors from modalfit command, how to plot them? as i am getting correct natural f...

7 years ago | 0 answers | 0

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answers

Question

Hi everyone, I have a question, what does p by m by n matrix means,,,,as far as i know, m and n represents the order of matrix, number of rows and columns...what is the third one?
Hi everyone, I have a question, what does p by m by n matrix means,,,,as far as i know, m and n represents the order of matrix,...

7 years ago | 1 answer | 0

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answer

Question

Hi everyone, please help me out in applying modalfit command? how it is used to extract mode shape vectors?
Hi everyone, please help me out in applying modalfit command? how it is used to extract mode shape vectors?

7 years ago | 0 answers | 0

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answers

Question

Hi everyone, i have one query, how mode shapes can be drawn from a mode shape vector. Actually mode shape should comprise of a lot of points while i got just one point, its real and imaginary part; how could a mode shape can be generated from that ?
Hi everyone, i have one query, how mode shapes can be drawn from a mode shape vector. Actually mode shape should comprise of a l...

7 years ago | 0 answers | 0

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answers

Question

Hi everyone, i am trying to install Matlab R2018 on my desktop PC. I have a problem, after complete installation, when i want to start matlab, it gives me license error? how to rectify it, should i have to reinstall the matlab or it can be solved?
Hi everyone, i am trying to install Matlab R2018 on my desktop PC. I have a problem, after complete installation, when i want to...

7 years ago | 1 answer | 0

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Answered
Hi everyone, how to use modalfit command to estimate modal vectors from a frf matrix?
sorry Walter, here is my code, where, b1 is a FRF matrix of size 2500x21, where 2500 represents frequency range and 21 are th...

7 years ago | 0

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Hi everyone, kindly help me out in resolving my problem. Can we find out eigen vectors (mode shape vectors) from frequency response function matrix. I know that ,value of frf matrix at eigen value(nat freq) is the sum of eigen vector values? but how
Hi everyone, kindly help me out in resolving my problem. Can we find out eigen vectors (mode shape vectors) from frequency respo...

7 years ago | 0 answers | 0

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answers

Question

Hi everyone, i need some help. How to calculate residue matrix Rm from a FRF matrix in matlab? any help?
Hi everyone, i need some help. How to calculate residue matrix Rm from a FRF matrix in matlab? FRF matrix is already in frequenc...

7 years ago | 0 answers | 0

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answers

Question

Hi everyone, how to use modalfit command to estimate modal vectors from a frf matrix?
Hi everyone, how to use modalfit command to estimate modal vectors from a frf matrix?

7 years ago | 1 answer | 0

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answer

Question

Hi everyone, i need help, i have a frequency response function matrix of a beam, how to calculate mass matrix M and stiffness matrix K from it?
Hi everyone, i need help, i have a frequency response function matrix of a beam, how to calculate mass matrix M and stiffness ma...

7 years ago | 0 answers | 0

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answers

Question

Hi everyone, i need some help, how to get modes directly from a frf matrix?
Hi everyone, i need some help, how to get modes directly from a frf (frequency response function) matrix?

7 years ago | 0 answers | 0

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Question

Hi everyone, can any body help me by telling how to extract modes directly, from frequency response functions.
Hi everyone, can any body help me by telling how to extract modes directly, from frequency response functions.

7 years ago | 0 answers | 0

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answers

Question

Hi everyone, how to use pchip and csape together for data smoothing?
Hi everyone, how to use pchip and csape together for data smoothing?

7 years ago | 1 answer | 0

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Question

Dear all, how to select the values for k and f, of savitzky-golay filter?
Dear all, how to select the values for k and f, of savitzky-golay filter?

7 years ago | 1 answer | 1

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Question

I have a matrix, representing frf curvature of an experimental data at 21 different points, column wise. how to apply savitzky golay filter on it to get a smoothed curvature. please, if anyone can help.
I have a matrix, representing frf curvature of an experimental data at 21 different points, column wise. how to apply savitzky g...

7 years ago | 0 answers | 0

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answers

Question

I have a matrix, representing frf curvature of an experimental data at 21 different points, column wise. how to apply savitzky golay filter on it to get a smoothed curvature. please send code if anyone could?
I have a matrix, representing frf curvature of an experimental data at 21 different points, column wise. how to apply savitzky g...

7 years ago | 0 answers | 0

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answers

Question

Hi everyone! i need assistance. How to generate a smoothing polynomial for a non smoothed polynomial/function?
How to generate a smoothing polynomial for a non smoothed polynomial/function?

7 years ago | 1 answer | 0

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Question

Hi everyone, how can i convert a 2500x21 matrix into 2500x42 matrix by using cubic/spline interpolation.
Hi everyone, how can i convert a 2500x21 matrix into 2500x42 matrix by using cubic/spline interpolation.

7 years ago | 1 answer | 0

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Question

Hi, everyone!
I need assistance, actually I have a matrix b=2500x21, which is imaginary part of a FRF signal. I want to find peaks for every c...

7 years ago | 1 answer | 0

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answer