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Method for iterative learning control of injection speed of nonlinear injection molding machine system

An iterative learning control and injection speed technology, applied in the field of system control engineering, can solve problems affecting system stability and dynamic performance, and achieve the effect of simple structure and low precision requirements

Inactive Publication Date: 2015-04-29
JIANGNAN UNIV
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Problems solved by technology

However, these existing algorithms are sensitive to the disturbance of the initial deviation or output error, which affects the stability and dynamic performance of the system.

Method used

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  • Method for iterative learning control of injection speed of nonlinear injection molding machine system
  • Method for iterative learning control of injection speed of nonlinear injection molding machine system
  • Method for iterative learning control of injection speed of nonlinear injection molding machine system

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Embodiment Construction

[0062] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0063] For nonlinear systems of injection molding machines with disturbance effects, such as figure 1 The forgetting factor algorithm flow of the P-type iterative learning control shown is: apply the current control u to the controlled object k (t), get the current output y k (t); use the current output y k (t) and the expected tracking trajectory y d (t) compared to get the current output error e k (t); calculate the next control amount, use the combination of the initial control and the current control and the current error to get u k+1 (t); Finally, iterate sequentially to achieve a satisfactory control effect.

[0064] Since the injection speed curve of the injection molding machine requires the molten material to pass through the runner in the first stage, the speed increases rapidly, and will remain basically constant in the later stage; in t...

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Abstract

The invention discloses a method for iterative learning control of the injection speed of a nonlinear injection molding machine system. The method comprises the following steps: firstly, establishing a nonlinear injection molding machine system model taking the injection speed as an output; secondly, constructing a nonlinear state variable dynamic equation of the injection molding machine; thirdly, designing a batch based time-varying forgetting factor iterative learning controller; and finally, analyzing the stability of an iterative control algorithm and the parameter selection of the controller, thereby realizing expected trajectory tracking control on the injection speed of the injection molding machine system under the condition with external disturbance influence. The method has the advantages that the provided P-type iterative learning control algorithm with forgetting factors does not have high requirements on the accuracy of an actual nonlinear system model, and the controller is simple in structure, has certain adaptability and robustness and can be further popularized and applied to other engineering objects including mechanical arms, fermentation processes and the like.

Description

technical field [0001] The invention relates to an injection speed iterative learning control method for a nonlinear injection molding machine system, belonging to the field of system control engineering. Background technique [0002] Injection molding machine is the main molding equipment for making thermoplastics or thermosetting plastics into various plastic products by molding molds, also known as injection molding machine or injection machine. Injection molding machine usually consists of injection system, clamping system, hydraulic transmission system, electrical control system and heating and cooling system, among which injection system is one of the most important components of injection molding machine. In the injection molding machine cycle, the injection system can heat and plasticize a certain amount of plastic within a specified time, and under a certain pressure and speed, inject the melted plastic into the cavity of the mold through the screw, and finally keep...

Claims

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Application Information

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IPC IPC(8): B29C45/76
CPCB29C45/76B29C2945/76494
Inventor 陶洪峰丁保
Owner JIANGNAN UNIV
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