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Linear quadratic fault-tolerant control method for infinite time domain optimization of batch process

A linear quadratic, fault-tolerant control technology, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve problems such as actuator failure, achieve efficient production, ensure fault-tolerant control performance, and reduce harm to personal safety. effect of accident

Active Publication Date: 2018-05-25
HAINAN NORMAL UNIVERSITY
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] The first purpose of the present invention is to seek suitable switching conditions and running time for different stages of the batch injection molding process; secondary fault-tolerant control method

Method used

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  • Linear quadratic fault-tolerant control method for infinite time domain optimization of batch process
  • Linear quadratic fault-tolerant control method for infinite time domain optimization of batch process
  • Linear quadratic fault-tolerant control method for infinite time domain optimization of batch process

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Embodiment

[0136] The injection molding process is a typical batch production process, and each batch mainly includes three steps, namely injection section→pressure holding section→cooling section. In the injection section, the screw moves forward to extrude the melt stored at the front end of the barrel (the raw material is heated by the heating ring) forward, flows through the runner, the runner, the gate, and enters the closed mold cavity ( inside the mold cavity). When the cavity is completely filled, the molding process switches from the injection section to the pressure holding section. In the pressure-holding section, the screw advances at a very low speed to maintain a certain nozzle pressure. A small amount of melt continues into the mold cavity, compensating for volume shrinkage due to cooling and solidification of the material. Once the gate with the smallest cross-sectional area in the mold is substantially solidified, the packing section stops and the process enters the co...

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Abstract

The invention proposes a linear quadratic fault-tolerant control method for infinite time domain optimization of a batch process. The method firstly establishes a multi-stage state space model by collecting input and output data, further converts the state space model into an extended state space model including state variables and output tracking errors, uses a switching system model for representation, then designs a controller which can be flexibly adjusted in real time in an infinite time domain, and finally aims at different phases to design dwell time which relies on the Lyapunov function. The method has the advantages that firstly, an optimal control law which can be flexibly adjusted in real time is designed in the infinite time domain to resist the influence caused by actuator failure and external interference on a system, so that the stable running of the system under the influence is ensured, and the system has optimal control performance; secondly, a switching law is designed without the need for setting of other parameters, and a value is obtained directly; the method accurately determines the running time of each stage, so that the running time of the system is shortened, product quality is ensured, and production efficiency is improved while the stable running of the system is ensured.

Description

technical field [0001] The invention belongs to the field of advanced control of industrial processes, and relates to a linear quadratic hybrid fault-tolerant control method for infinite time-domain optimization of batch processes. Background technique [0002] With the rapid development of society, people's requirements for high-quality batch production are getting higher and higher. This high demand has resulted in the need for production to operate under more complex conditions, with a corresponding increase in the probability of system failure. Among these failures, actuator failure is the most common one. Due to the characteristics of friction, dead zone, saturation, etc., the actuator will inevitably have some failures during the execution process, which makes it difficult for it to reach the specified or ideal position. If the failure is not detected and corrected in time, the production performance will inevitably deteriorate, and even cause safety problems for equ...

Claims

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Application Information

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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 王立敏罗卫平余维燕王鹏
Owner HAINAN NORMAL UNIVERSITY
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