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# Izhak Bucher

14 total contributions since 2000

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Rotor Dynamics toolbox (RotFE)
Toolbox models rotating, elastic shafts with disks

Responded

Re: finding phase shift using i and q signals
Here's the explanation: Now, multiply by cos(w*t) and sin(w*t) respectively (that's what you did), the purpose, as you will see...

8 years ago | 7656 views

Responded

Re: finding phase shift using i and q signals
Fs = 10e3; t=(0:Fs)/Fs'; ph=45; You just need to filter out the double frequency (what you aare doing is called sync. detection)...

8 years ago | 7656 views

Responded

Re: finding phase shift using i and q signals
Fs = 10e3; t=(0:Fs)/Fs'; ph=45; You just need to filter out the double frequency (what you aare doing is called sync. detection)...

8 years ago | 7656 views

Responded

Re: How to find the factored and polynomial form of a transfer function.
zp=zpk(H); where for siso zp.p{1} % poles zp.k{1} % gain

8 years ago | 5863 views

Responded

Re: MDOF vibration problem using ode45
William, 1) The problem has a closed from solution, easy to find. state solution would be u=(([k]-w^2*[m])\p)*sin wt 2) Move ...

9 years ago | 6071 views

Responded

Re: 2nd order exponential curve fitting
Here's a proposed method %fit y=exp(ax + bx^2), % %Example, %% simulate a=1; b=0.1; x=linspace(0,5,100)'; y=exp(a*x+b*x.^2); ...

9 years ago | 1516 views

Responded

Re: Cutting off decimal places
Matthew Allen" <allenmatthew@yahoo.com> wrote in message x = 123.2187871823 ; % sample number to round N=3; ...

9 years ago | 31398 views

Responded

Re: fitting points to a sin function
Rafael. Here's some code to help you (below). A short explanation. The problem can be broken into linear least squares and non...

9 years ago | 16263 views

Responded

Re: Transform FRF to Impulse Response
Since h(t) is real, therefore, your frequency response is compute for positive frequencies w=(0,wmax), compute the impulse r...

9 years ago | 2708 views

Submitted

Circle fit
Fit a circle to a set of measured x,y points.

Submitted

2-sided Zmod
Shows a bi-directional spectrogram of a whirling shaft.

Submitted

Harmonics cursors
Shows moveable cursors with a center frequency and evenly spaced harmonics.