How to add ramping in sin function

I want to add ramping in sin function for first few mili seconds as shown in figure (red wave) how can I do that. I was trying to plot direct sine function but I am not able to get any ramping. I want to create a dynamic laoding of 5 m/sec2 having a frequency of 20 Hz.

right now i am doing this:

t = 0:0.001:1;

x = 5*sin((125.66)*t);

plot(t,x)

Answer 1

[Mathieu NOE]

hello

see my little demo below :

clc
clearvars

% signal 
Fs = 100;
dt= 1 /Fs;
samples = 1e3;
freq = 10;
t = (0:samples-1)*dt;
x = 3*sin(2*pi*freq*t);

%% create a window (ramp of given slope)
% ascending ramp
t0 = 1; % start time of ramp
t1 = 2; % stop time of ramp
window = zeros(1,length(t));
ind = find(t>=t0 & t<= t1);
tmp = linspace(0,1,length(ind));
window(ind) = tmp;
window(t>t1) = 1;

% descending ramp
t2 = 6; % start time of ramp
t3 = 8; % stop time of ramp
ind = find(t>=t2 & t<= t3);
tmp = linspace(1,0,length(ind));
window(ind) = tmp;
window(t>t3) = 0;

% windowed signal
xw = x.*window;

plot(t,xw)

[RAHUL DOGRA]

thanks alot sir. it will really help me.

[Mathieu NOE]

My pleasure !

would you mind accepting my answer ?

tx