Unlock instant, AI-driven research and patent intelligence for your innovation.

Polypropylene apparatus grade switching and controlling method

A technology of brand switching and control method, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problems of difficulty in online operation, complex design, poor practicability, etc.

Inactive Publication Date: 2010-12-22
ZHEJIANG UNIV OF TECH
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of complicated design, difficulty in online operation, and poor practicability of the existing polypropylene device grade switching control method, the present invention provides a polypropylene device grade with simple design, easy understanding, online operation, and strong practicability switch control method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Polypropylene apparatus grade switching and controlling method
  • Polypropylene apparatus grade switching and controlling method
  • Polypropylene apparatus grade switching and controlling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0067] The present invention will be further described below in conjunction with the accompanying drawings.

[0068] refer to Figure 1 ~ Figure 4 , a polypropylene device brand switching control method, the control method comprises the following steps:

[0069] 1) Establish a discrete-time state-space model for the switching process of polypropylene grades, see formula (1a) and formula (1b):

[0070]

[0071]

[0072] Wherein, in formula (1a), x=[x 1 , x 2 , x 3 , x 4 ]'=[ln(MI c，1 ), ln(MI c，2 ), Et c，1 ,Et c，2 ]', u=[u 1 , u 2 ]=[T 1 , C 1hm , C 1mm ; T 2 , C 2hm , C 2mm ]' and y=[y 1 ,y 2 ]'=[ln(MI c，2 ), Et c，2 ]' are state variable, input variable and output variable when switching to homopolymer or random copolymer brand respectively; In formula (1b), x=[x 1 , x 2 , x 3 , x 4 ]'=[ln(MI c，1 ), ln(MI c，2 ), ln(MI c，3 ), Et c，3 ]', u=[u 1 , u 2 , u 3 ]=[T 1 , C 1hm , C 1mm ; T 2 , C 2hm , C 2mm ; T 3 , C 3hm , C 3mm ]' and y=[y...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for switching and controlling polypropylene device mark. The method comprises: establishing a linear subsystem optimal controller according to the systematic linear performance index by establishing a polypropylene mark switching process discrete time state space Hammerstein model; designing state observation through a pole assignment method according to an expected pole of a systematic state observer; establishing a model forecasting controller based on the state observer according to a systematic quadratic performance index; updating initial conditions of the optimal control problem; and then carrying out the rolling optimization calculation of the current forecasting control variable repeatedly till the mark switching process is switched to a target market and stable production. The method has simple design, easy understanding, easy realization of online commissioning, and good practicability. The method can realize the continuous automatic switching of polypropylene marks, particularly marks of different categories on a wide range, thereby greatly shortening the mark switching time, reducing the emission of unqualified products, and improving the production economic benefits and market competitiveness.

Description

technical field [0001] The invention relates to a method for controlling grade switching of a polypropylene device. Background technique [0002] In order to meet the diverse needs of the market for polypropylene products and higher quality requirements, as well as to pursue higher economic benefits for enterprises, polypropylene plants need to frequently switch production grades. At the same time, with the development of polypropylene industry and production technology, the scale of production is getting larger and larger, and the switching frequency of grades is getting higher and higher, and each switching is always accompanied by a large amount of transition time and the generation of unqualified materials, that is, waste. Affect the economic benefits of production and energy saving and consumption reduction indicators of enterprises. The grade switching process of a large-scale polypropylene plant is a complex multivariable, strongly coupled, and multi-constrained "ess...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
Inventor 何德峰俞立欧林林何超
Owner ZHEJIANG UNIV OF TECH