Envelope of a vibration signal

Hello everyone,

I am trying to find the envelope of vibration signal and am using similar code to the one in this link but am getting totally different graphs. Ive attached the graphs which I got.

Thanks,,

This is the link: https://www.mathworks.com/help/signal/ug/envelope-extraction-using-the-analytic-signal.html

And this is the code am using:

clc
close all
clear all

t = 0:1e-4:1;
x = [1+cos(2*pi*50*t)].*cos(2*pi*1000*t);
y = hilbert(x);
env = abs(y);

figure(1)

plot(t,x)
hold on
plot(t,[-1;1]*env,'r','LineWidth',2)
xlim([0 0.1])
xlabel('Seconds')

%%====================================================================== %%

% Load Healthy Bearing
load('*************************.mat')

vib     = vibG ;

h = hilbert(vib);
henv = abs(h)';

figure(2)
plot(tt,vib,'b')
hold on
plot(tt,[-1;1]*henv,'r','LineWidth',2)
xlim([0 0.1])
xlabel('Seconds')