在实验的基础上确定了温箱系统温度的数学模型, 用P ID 控制方法对温箱温度控制, 由于
P ID 控制不能同时满足较小的超调量和较短的调节时间的要求, 为此必须采用其它先进的控制策
略, 选择预测控制获得较满意的结果. 并用MA TLAB 对设计的P ID 控制和预测控制分别进行了仿真和比较, 结果表明预测控制在本系统中比P ID 控制更理想.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.000918s ]
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:0.076563s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000893s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001178s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000958s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.004938s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001089s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003839s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015038s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001071s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 475932 [ RunTime:0.027245s ]
