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Air temperature control method in printing and dyeing workshop

A temperature control method and workshop air technology, applied in the field of information, can solve the problems of gray cloth dyeing color chroma value error, gray cloth dyeing unevenness, gray cloth dyeing color chroma value has a great influence, etc., and achieve the effect of improving control accuracy

Active Publication Date: 2016-11-23
HANGZHOU DIANZI UNIV
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Problems solved by technology

However, the air temperature in the workshop during the dyeing process has a great influence on the chroma value of the dyed color of the gray cloth. If the air temperature in the workshop is not properly controlled, it will cause uneven dyeing of the gray cloth and affect the overall effect and appearance of the gray cloth.
[0003] Nowadays, the air temperature control in the workshop of printing and dyeing enterprises mainly adopts open-loop control. Rapid opening and emergency stop will easily lead to damage to the two-way valve, and it will also easily cause the air temperature control accuracy in the workshop to be low during the dyeing process, which will eventually lead to a large error in the chromaticity value of the dyed gray fabric. Big

Method used

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  • Air temperature control method in printing and dyeing workshop

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Embodiment Construction

[0063] Concrete implementation steps of the present invention are as follows:

[0064] 1. The establishment of the prediction model of the air temperature control system in the printing and dyeing workshop.

[0065] In the first step, at various typical temperatures such as 5°C, 10°C, 15°C, 20°C, 15°C, 30°C, and 35°C, the valves of the cold water two-way valve, the heating two-way valve and the steam two-way valve are opened. The temperature value is the input control quantity, and the air temperature of the dyeing workshop collected by the temperature sensor is the output quantity. Through the system identification method, the discrete time transfer function model of the air temperature control system of the printing and dyeing workshop is established.

[0066] A i (z -1 )y(k)=B i (z -1 )u(k)

[0067] Wherein y(k) represents the air temperature value of the dyeing workshop; u(k)=[u 1 (k), u 2 (k), u 3 (k)] T is the control input variable at time k, where u 1 (k) rep...

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Abstract

The invention discloses an air temperature control method in a printing and dyeing workshop. The invention adopts a multi-model switching system predictive control method. When the air temperature in the dyeing workshop changes, the switching system model of the workshop air temperature under different typical working conditions is established by properly adjusting the parameters of the system model. Then, by designing a finite-time domain convergence observer for multi-model switching systems, the estimation accuracy and convergence speed of output value prediction are improved. Finally, the QP algorithm is used to solve the optimal control law, so as to improve the accuracy of air temperature control in the dyeing process workshop. Compared with the existing control technology, the method of the invention guarantees high control accuracy and stability under the consideration of the operating characteristics of various typical working conditions, and meets the energy-saving needs of low cost and high benefit in the actual industrial process.

Description

technical field [0001] The invention belongs to the field of information technology, and relates to a method for controlling the air temperature in a printing and dyeing workshop by controlling the valve opening values ​​of a cold water two-way valve, a heating two-way valve and a steam two-way valve during the dyeing process, which can be used in the printing and dyeing industry. Background technique [0002] With the further development of modern printing and dyeing technology, printing and dyeing enterprises have higher and higher requirements for the quality of dyeing process synthetic products. The air temperature in the workshop during the dyeing process has a great influence on the chroma value of the dyed color of the gray cloth. If the air temperature in the workshop is not properly controlled, it will cause uneven dyeing of the gray cloth and affect the overall effect and appearance of the gray cloth. [0003] Nowadays, the air temperature control in the workshop o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/00
CPCY02P80/10
Inventor 陈云孙秀芳周晓慧鲁仁全
Owner HANGZHOU DIANZI UNIV
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