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Pressure closed loop control method for large-circulation grouting monitor system

A monitoring system and closed-loop control technology, applied in general control systems, control/regulation systems, adaptive control, etc., can solve problems such as large errors, inability to be used as a control model for on-site monitoring systems, and poor control flexibility.

Inactive Publication Date: 2012-08-08
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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AI Technical Summary

Problems solved by technology

At high pressure, the automatic adjustment ability of the valve is improved, but it cannot automatically track the change of the grouting pressure curve, and the control flexibility is poor
The control method based on fuzzy PID needs to establish the grouting pressure and the mechanism model of the system, while the existing grouting pressure modeling method takes the conceptual model of the crack as the object, and establishes the mechanism model of the grouting parameters. There are two defects in this mechanism model, one is that the geometric parameters of cracks in the model are difficult to obtain in the actual grouting process; the other is that there are many assumptions and the error is usually large
However, the finite element calculation model for grouting in complex fractured rock formations has poor real-time performance and cannot be used as a control model for the on-site monitoring system

Method used

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Embodiment 1

[0033] Determine the upper and lower bounds of the system model parameters: collect the case data of the existing grouting process and analyze the grouting process, determine the upper and lower boundary values ​​of the pressure, flow and density parameters of the grouting process; select model variables to determine the model structure of the grouting pressure control system : The physical model of the entire controlled object is abstracted into a closed double-capacity system with uncertain flow changes, and the modeling of the grouting pressure is transformed into the modeling of the pressure concentration parameters at the bottom of the closed container; according to the simplified physical model, the grouting fluid is injected into the process It is decomposed into several sub-processes, combined with the law of conservation of mass, and lists the differential equations or linear equations of the sub-processes, from which the auxiliary variables of the grouting pressure mod...

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Abstract

The invention discloses a pressure closed loop control method for large-circulation grouting monitor system, which comprises the following steps of: determining the upper and lower boundaries of system model parameters; choosing model variables and determining the structure of a grouting pressure control system model; acquiring a modeling algorithm for the support vector machine of the grouting pressure model; correcting the grouting pressure model; and controlling based upon the direct control policy of a grouting pressure predication model; the control method disclosed by the invention is accurate and good in operability, and brings great convenience to practical construction.

Description

technical field [0001] The invention relates to a grouting monitoring system, in particular to a pressure closed-loop control method of a large circulation grouting monitoring system. Background technique [0002] Due to the effectiveness and economy of the grouting process, the grouting technology is an indispensable process in the foundation reinforcement, anti-seepage and plugging of water conservancy dams. The grouting pressure is one of the key parameters affecting the grouting pressure. Due to the mutual influence of the stratum change and the grouting parameters, the grouting process presents great uncertainty, time-varying and non-linearity, and the grouting construction process cannot truly automatically control the grouting pressure. The current large cycle monitoring system relies heavily on the operating experience and professional quality of engineers, and is prone to major accidents similar to the grouting construction of the Tianshengqiao No. 2 Hydropower Stat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
Inventor 李凤玲易继军李方义刘晖
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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