On-Line Roundness Error Compensation via P-Integrator Learning Control

1992 ◽  
Vol 114 (4) ◽  
pp. 476-480 ◽  
Author(s):  
C. J. Li ◽  
S. Y. Li
Keyword(s):  
Error Compensation ◽  
Learning Control ◽  
Experimental Results ◽  
Compensation Scheme ◽  
Research Project ◽  
Turning Operations ◽  
Roundness Error ◽  
Cnc Lathe ◽  
On Line ◽  
Metrology System

The work described is the result of a research project for developing a roundness error compensation scheme in turning processes based on the p-integrator learning controller and an on-line metrology system. The objective is to eliminate the repeatable error in turning operations. The scheme was realized on a CNC lathe. The effectiveness of the scheme is supported by the experimental results obtained through workpiece inspections.

A New Method for Roundness Control in Taper Turning Using FCC Techniques

2000 ◽  
Vol 123 (4) ◽  
pp. 567-575 ◽  
Author(s):  
Eric H. K. Fung ◽  
S. M. Yang
Keyword(s):  
Real Time ◽  
Error Compensation ◽  
Experimental Results ◽  
New Method ◽  
Two Dimensional ◽  
Turning Operations ◽  
Roundness Error ◽  
Compensatory Control ◽  
Modeling And Forecasting ◽  
Arma Modeling

This paper describes a methodology of online measuring and compensating spindle error motions without using a precalibrated master. The method is based on a combination of forecasting compensatory control (FCC) and error separation techniques. The real time recursive ARMA modeling technique is used for the modeling and forecasting of workpiece errors while the error compensation is performed by means of two-dimensional piezo-actuated tool movements. Experimental results have shown that an improvement of 42–47 percent was achieved for the roundness error of workpieces in the taper turning operations.

A Method for Estimating and Compensating Quasistatic Errors of Machine Tools

1993 ◽  
Vol 115 (1) ◽  
pp. 149-159 ◽  
Author(s):  
P. M. Ferreira ◽  
C. Richard Liu
Keyword(s):  
Parameter Estimation ◽  
Error Compensation ◽  
Machine Tools ◽  
Experimental Results ◽  
Compensation Scheme ◽  
Order Of Magnitude ◽  
Magnitude Improvement

Quasistatic errors are the major contributors to positioning inaccuracies of machine tools. These errors, estimated to account for 70 percent of the errors of the machine, have been observed to be as high as 70 to 120 μm for production class machining centers. In this paper, a model for these errors is developed. Further, it is shown that the parameters for this model can be estimated by the observation of a few (nine) error vectors in the machine’s workspace. These two results form the basis for a viable error compensation scheme; the model for error compensation and the parameter estimation for updating the model. Experimental results verify the validity of the approach. An order-of-magnitude improvement in the accuracy of the machine, with respect to a calibration frame, was observed.

Experiments on Adaptive Constrained Control of a CNC Lathe

1982 ◽  
Vol 104 (2) ◽  
pp. 139-150 ◽  
Author(s):  
R. Bedini ◽  
P. C. Pinotti
Keyword(s):  
Numerical Control ◽  
Machining Process ◽  
Hill Climbing ◽  
Constrained Control ◽  
Economic Aspects ◽  
Machining Time ◽  
Turning Operations ◽  
Control Optimization ◽  
Cnc Lathe ◽  
On Line

The technological and economic aspects of the on-line optimization of turning operations on lathes equipped with a Computerized Numerical Control (CNC) are discussed. A model of the machining process suitable for developing an Adaptive Constrained Control (ACC) is described. For optimization, a hill-climbing strategy which can be software implemented in the operating system of the CNC is used. Performance of such an ACC is also compared with the more general Adaptive Control Optimization (ACO) System. Machining tests carried out on a CNC lathe fitted with the ACC System are reported and discussed. The practical effectiveness of the ACC so developed and the reduction in machining time are demonstrated with reference to complete working cycles of typical workpieces.

An On-Line Tool Wear Sensor for Straight Turning Operations

1985 ◽  
Vol 107 (4) ◽  
pp. 397-399 ◽  
Author(s):  
H. Suzuki ◽  
K. J. Weinmann
Keyword(s):  
Adaptive Control ◽  
Tool Wear ◽  
Displacement Transducer ◽  
Experimental Results ◽  
Turning Operations ◽  
Satisfactory Accuracy ◽  
Tool Holder ◽  
Work Surface ◽  
On Line ◽  
Measuring Tool

This paper describes the design of an on-line tool wear sensor for straight turning operations, which will lead to the realization of adaptive control for optimization (ACO). Tool wear is detected by measuring the change in distance between tool holder and work surface using a stylus which is mounted on the tool holder. The stylus movement is sensed by a displacement transducer. The experimental results indicate that the sensor is capable of measuring tool wear with satisfactory accuracy.

Study of the route correction system for the on-board navigation system of an unmanned aerial vehicle on the grounds of radar images of the terrain

2020 ◽  
pp. 129-134
Keyword(s):  
Predictive Model ◽  
Unmanned Aerial Vehicle ◽  
Predictive Models ◽  
Navigation System ◽  
Error Compensation ◽  
Compensation Scheme ◽  
Radar Images ◽  
Aerial Vehicle ◽  
System Errors ◽  
Correction System

The system of route correction of an unmanned aerial vehicle (UAV) is considered. For the route correction the on-board radar complex is used. In conditions of active interference, it is impossible to use radar images for the route correction so it is proposed to use the on-board navigation system with algorithmic correction. An error compensation scheme of the navigation system in the output signal using the algorithm for constructing a predictive model of the system errors is applied. The predictive model is building using the genetic algorithm and the method of group accounting of arguments. The quality comparison of the algorithms for constructing predictive models is carried out using mathematical modeling.

Study on the Truck Scale Cheating Automatic Monitoring System Based on the GPRS

2013 ◽  
Vol 703 ◽  
pp. 240-243 ◽  
Author(s):  
Yan Jun Zhao ◽  
Shou Guang Cheng ◽  
Bin Qu
Keyword(s):  
Monitoring System ◽  
Measurement Data ◽  
Experimental System ◽  
Automatic Monitoring ◽  
Experimental Results ◽  
Pneumatic Conveying ◽  
Automatic Monitoring System ◽  
On Line ◽  
Conveying System

The truck scale is more and more applied on the weighing system. To seek illegal profits, many kinds of truck scale cheating method is found in the weighing system. To monitoring the truck scale cheating method, the truck scale cheating automatic monitoring system based on the GPRS is brought out in this paper. The truck scale cheating automatic monitoring system is designed. The monitoring system includes three parts: the monitoring terminal, the GPRS transmission module and the upper monitoring system. The truck scale measurement data of the sensors are collected by the monitoring terminal and sent to the upper monitoring system through the GPRS module. The experimental system is established on the pneumatic conveying system and the experiment is carried out. The experimental results show that the automatic monitoring system can on-line monitor the truck scale cheating method and improves the security of the truck scale weighing system.

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