Water sample COD concentration nonlinear decoupling control method based on differential geometric feedback control

A feedback control, differential geometry technology, applied in the direction of using chemical indicators for analysis, etc., can solve problems such as affecting the accuracy of measurement results

Pending Publication Date: 2021-06-01
南京杰思尔环保智能科技有限公司
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Problems solved by technology

COD is a comprehensive test method of experiment and curve fitting that depends on the detection method, environment, etc. There is a serious nonlinearity between the output value of COD and the detected amount, which seriously affects the accuracy of the measurement results.

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  • Water sample COD concentration nonlinear decoupling control method based on differential geometric feedback control

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[0022] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0023] For the COD value (q COD ), there are many influencing factors, and the amount of sample to be measured (q 1 ), digestion tank temperature (T), ambient humidity (H), the amount of chemical reagent potassium dichromate added (q 2 ), the amount of acid added to the chemical reagent (q 3 ), adding chemical anti-interference reagent mercury salt (q 4 ), adding chemical catalyst silver salt (q 5 ).

[0024] During the measurement, the aerobic organic matter is absorbed by potassium dichromate (K 2 Cr 2 o 7 ), sulfuric acid (H 2 SO 4 ) oxidation to produce water and carbon dioxide, hexavalent chromium (Cr 6+ ) is reduced to trivalent chromium (Cr 3+ ). Add a known amount of potassium dichromate solution to the water sample, and use silver salt as a catalyst in a strong acid medium. After boiling and refluxing, use ferrous iron as an in...

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Abstract

A water sample COD concentration nonlinear decoupling control method based on differential geometric feedback control comprises the following steps: S1, establishing a chemical oxygen demand model qCOD = F (T, H, q1, q2, q3, q4, q5), and inputting a model constraint; S2, analyzing the characteristics of the chemical oxygen demand model qCOD = F (T, H, q1, q2, q3, q4, q5), and judging whether a system can use a differential geometry feedback control method according to whether the Jacobian matrix of the nonlinear system F is full rank; and if the Jacobian matrix is full rank, that is, the Jacobian matrix accords with a relative order, determining that a differential geometric feedback control method can be used; S3, if the nonlinear system F meets the condition of a relative order, calculating a feedback transformation matrix phi of differential geometry feedback control; S4, performing matrix transformation on the feedback transformation matrix phi; S5, processing measurement data in a new domain; and S6, inversely transforming a result obtained in the new domain into an actual measurement domain. According to the invention, a differential geometric feedback control analysis method is applied to input and output analysis of a measurement system aiming at nonlinear characteristics of a system description function F.

Description

technical field [0001] The invention belongs to the technical field of chemical oxygen demand (Chemical Oxygen Demand, COD) measurement, in particular to a non-linear decoupling control method for water sample COD concentration based on differential geometric feedback control. Background technique [0002] Chemical Oxygen Demand (COD) is the amount of oxidant consumed when a certain strong oxidant is used to treat water samples under certain conditions. COD is a comprehensive test method of experiment and curve fitting that depends on the detection method, environment, etc. There is a serious nonlinearity between the output value of COD and the detected amount, which seriously affects the accuracy of the measurement results. [0003] The emergence and development of differential geometry are closely related to mathematical analysis. The first to contribute in this regard was the Swiss mathematician Euler. In 1736, he first introduced the concept of the intrinsic coordinate...

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Application Information

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IPC IPC(8): G01N31/22
CPCG01N31/22
Inventor 黄松清
Owner 南京杰思尔环保智能科技有限公司
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