%峰值法

clear
close?all
format?long

fprintf（‘Samples?In?Test?:\n‘）;
path_base?=?sprintf（‘test‘）;
dir_sample?=?dir（path_base）;
[nsampledummy]?=?size（dir_sample）;
nsample?=?nsample?-?2;
for?i?=1:nsample
????fprintf（strcat（num2str（i）‘:?????‘））;
????fprintf（dir_sample（i+2）.name）;
????fprintf（‘\n‘）;
end
SampleNum?=?input（‘Please?select?the?sample?number:\n‘）;

path_sample?=?strcat（path_base‘\‘dir_sample（SampleNum+2）.name）;?%strcat：連接字符串的函數(shù)
name_sample?=?dir_sample（SampleNum+2）.name;

%提取測試數(shù)據(jù)
data（:1）=load（path_sample）;?
%所選的時(shí)域樣本內(nèi)數(shù)據(jù)個(gè)數(shù)
ntdata?=?length（data（:1））;?
Cvtdata=?zeros（ntdata1）;


%【1】正常信號(hào)處理:
Cvtdata?=?data;
%【1】正常信號(hào)處理end;


%?%【2】Narada信號(hào)轉(zhuǎn)換:
%?for?j=1:length（data（:1））
%?????data（j1）?=?data（j1）?*?5.0?/?65535.0;??%Convert?the?data?轉(zhuǎn)化為電壓信號(hào)
%?end???????
%?
%?%增益系數(shù)
%?gain?=?10;
%?for?j=1:ntdata??????
%?????Cvtdata（j1）=?data（j1）/（gain*200/1000）;
%?end
%?Avgdata?=?zeros（11）;
%?Avgdata?=?mean（?Cvtdata（:1）??）;?%求數(shù)據(jù)平均值
%?%【2】Narada信號(hào)轉(zhuǎn)換end;

%?峰值法識(shí)別
f?=?800;??%采樣頻率
fs?=?f;
fc?=?0.02;??%高通截?cái)囝l率
%?dummyV?=?IdealHighPass?（DSet?fs?fc）?;?????%濾波
%?nDSet=?dummyV（1:size（DSet1））;???
t?=?0:1/f:（ntdata-1）/f;


%%%??FFT?快速傅里葉變換??%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%?[Nsdummy]=?size（nDSet（:1））;????%Sample?size?樣本大小
mag=abs（fft（Cvtdatantdata））;???%Magnitude?
mag（1:51）=?mag（1:51）/20;
freqdomain=?fs*（0:ntdata-1）‘/ntdata;???%?Frequency?series

figure;
plot（tCvtdata）;
xlabel（[‘Time?（s）‘]）;
ylabel（[‘Accel?（g）‘]）;?
grid?on
%?annotation（‘textbox‘[0.20.80.90.2]‘string‘strcat（?Narada_name‘??Time:??‘dataFolder）‘EdgeColor‘‘none‘‘FontSize‘16）;

figure;
hold?on
title（‘fft-data‘）;
plot（freqdomain（1:ntdata/21）mag（1:ntdata/21））;
xlabel（‘Frequency?（Hz）‘‘FontSize‘14）;
%?ylabel（‘Magnitude‘‘FontSize‘14）;
ylabel（‘Magnitude‘‘FontSize‘14）;
hold?off

%%%Obtain?psd?estimate?using?welch‘s?method
if?1==1
figure;
%?hold?on
title（‘pwelch-data‘）;
[psd_cf_c]=pwelch（Cvtdatantdata0[]fs‘onesided‘）;??%pls?set?the?stablized?time?of?zeropadding?as?10s.
pwelch（Cvtdatantdata0[]fs‘onesided‘）;
figure;
loglog（f_cpsd_c）;
xlabel（‘Frequency?（Hz）‘）;
ylabel（‘Power?Spectrum?Density?‘）;
%?hold?off
end

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????文件???????2351??2015-10-21?12:41??peak_picking.m

-----------?---------??----------?-----??----

?????????????????2351????????????????????1