利用聚类算法和小波分析进行声发射信号的阈值去噪
对加噪信号进行分段，然后进行小波变换，得到整体的D3+D4值，用聚类算法得到阈值，然后对变换后的信号去噪处理。
for i = 1:part_num
x = u(i,:);
j = 2/step;
for m = 1:j
for n = 1:M
OL(m,n) = (x(n)-(-1+m*step))^2;
%OL(m,n) = abs(x(n)-(-1+m*0.001));
end
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SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.000999s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.075830s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001024s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001241s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000971s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003122s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002159s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003829s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015423s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001246s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 286066 [ RunTime:0.014263s ]
