How to create a sine wave with variable frequency - Simulink

조회 수: 39 (최근 30일)
HF . 2020년 12월 8일
댓글: Mathieu NOE . 2020년 12월 13일
I have the following problem. I have a set of data of my vehicle and need the acceleration data in the shape of a sine wave. The sine wave is then used to include some bearing faults. I could compute for every time step the frequency based on the velocity, which then can be used in the further steps.
Does anyone has an idea in how to create a sine wave with various frequency?
Thank you in advance!

채택된 답변

Mathieu NOE
Mathieu NOE 2020년 12월 8일
if you have the frequency at each time step, you can also calculate the angular increment at each time step : d_theta = 2*pi*freq*dt.
Then you simply need to integrate it (do a cumulative sum, modulo 2pi) to get the angle, then apply sin function.

추가 답변 (1개)

Rafael Hernandez-Walls
Rafael Hernandez-Walls 2020년 12월 8일
something like this: (?)
  댓글 수: 1
Mathieu NOE
Mathieu NOE 2020년 12월 13일
here a demo for a sinus log sweep
% log sweep demo
f1 = 50; % start freq
f2 = 200; % stop freq
Fs = 1e3; % sampling frequency
duration = 30; % s
dt = 1/Fs;
samples = floor(duration*Fs)+1;
t = (0:dt:(samples-1)*dt);
log10_freq = linspace(log10(f1),log10(f2),samples);
freq = 10.^log10_freq;
omega = 2*pi*freq;
angle_increment = omega.*dt;
angle = cumtrapz(angle_increment); % angle is the time integral of omega.
signal = sin(angle);

댓글을 달려면 로그인하십시오.


Help CenterFile Exchange에서 Switches and Breakers에 대해 자세히 알아보기

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by