Aspen dynamic 温度控制板的SVD法选择？ 重新研究了一下，有些懂了，但是实际操作的时候还有很多问题。现共享如下： the detail method is as follow： 1. a very small change (0.1% of the design value) is made in one of the manipulated variables (e.g., reflux flowrate). 2. the procedure is repeated for theother manipulated variable (e.g., reboiler heat input). 3. dividing the change in the tray temperature by the change in the manipulated variable gives the openloop steady-state gain between temperature on that tray and each manipulated variable. (a problem appeared here when i did it.) 4. a gain matrix k is formed by the two gain obtained above. 5. this matrix k is decomposed using standard svd programs (e.g.the svd function in matlab) into three matrices: [u,s,v]=svd(k,0) . 6. the two u vectors are plotted against the tray number. the tray or trays with the largest magnitudes of u indicate locations in the column that can be most effectively controlled. the problem appeared when i calculated the gain in the second step. because the very small change of reflux ratio and reboiler duty have a large difference. the results of gain with reflux become very big, even over one thousand. but the other still keep a small value. this phenomenon have a much difference with the result of luyben's book. 查看更多
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