Plot and calculate Damping ratio

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Dai Nguyen
Dai Nguyen 2021-2-23
评论： Star Strider 2021-2-23
Hi I want to calculate damping ratio by using the log decrement method, but for my understanding we need to select 2 peaks in order to do it. Can matlab do it by itself ?or I have to do it manually. Here is what I got so far.
[v,T,vT]=xlsread('Velocity_Response_of_Pendulum.xlsx')
Time=v(:,1);
Veloc=v(:,2);
xlabel('Time');
ylabel('Velocity');
plot(Time,Veloc);
%pick the first peak (t,v) (0.372,0.02884)
%pick the 2nd peak (1.826, 0.02883)
damp_ratio=

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回答（1 个）

Star Strider
Star Strider 2021-2-23
The findpeaks or islocalmax functions can return the information to do the calculations.
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Star Strider
Star Strider 2021-2-23
My pleasure!
If my Answer helped you solve your problem, please Accept it!
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