Model-Based Predictive Control of Workpiece Accuracy in Bar Turning

1998 ◽  
Vol 120 (1) ◽  
pp. 57-67 ◽  
Author(s):  
A. M. Shawky ◽  
M. A. Elbestawi
Keyword(s):  
Real Time ◽  
Mechanistic Model ◽  
Cutting Fluid ◽  
Open Architecture ◽  
Time Model ◽  
Integral Control ◽  
Model Based ◽  
Full State Feedback ◽  
On Line ◽  
Bar Turning

In this paper a real-time model-based geometric control system is proposed for workpiece accuracy in bar turning. An on-line ultrasonic measurement system that operates in the presence of cutting fluid is employed for workpiece diameter measurement. A state space mechanistic model is used to overcome the delay in the feedback loop. A Kalman Filter is used in a predictor-corrector fashion to update model predictions using on-line measurements. A full state feedback controller with an integral control action is designed and used to manipulate the tool position in real-time for machining error compensation. The performance of the proposed control strategy is evaluated through cutting experiments performed on a CNC turret lathe retrofitted with an open architecture controller.

Distributed Network System for Real-Time Model Based Control of Industrial Gas Turbines

2011 ◽  
Author(s):  
V. Panov
Keyword(s):  
Control System ◽  
Real Time ◽  
Gas Turbine ◽  
Distributed Network ◽  
Hardware In The Loop ◽  
Time Model ◽  
Model Based Control ◽  
Model Based ◽  
On Line ◽  
Dedicated Hardware

This paper describes the development of a distributed network system for real-time model based control of industrial gas turbine engines. Distributed control systems contribute toward improvements in performance, testability, control system maintainability and overall life-cycle cost. The goal of this programme was to offer a modular platform for improved model based control system. Hence, another important aspect of this programme was real-time implementation of non-linear aero-thermal gas turbine models on a dedicated hardware platform. Two typical applications of real-time engine models, namely hardware-in-the-loop simulations and on-line co-simulations, have been considered in this programme. Hardware-in-the-loop platform has been proposed as a transitional architecture, which should lead towards a fully distributed on-line model based control system. Distributed control system architecture offers the possibility of integrating a real-time on-line engine model embedded within a dedicated hardware platform. Real-time executing models use engine operating conditions to generate expected values for measured and non-measured engine parameters. These virtual measurements can be used for the development of model based control methods, which can contribute towards improvements in engine stability, performance and life management. As an illustration of model based control concept, the example of gas turbine transient over-temperature protection is presented in this study.

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