Development of a Forecasting Compensatory Control System for Cylindrical Grinding

1987 ◽  
Vol 109 (4) ◽  
pp. 385-391 ◽  
Author(s):  
K. H. Kim ◽  
K. F. Eman ◽  
S. M. Wu
Keyword(s):  
Control System ◽  
Substantial Improvement ◽  
Error Source ◽  
Mechanical Motion ◽  
Cylindrical Grinding ◽  
Radial Error ◽  
Electric Drive System ◽  
Compensatory Control ◽  
Grinding Operations ◽  
Error Motion

A forecasting compensatory control (FCC) system was developed to improve workpiece roundness in cylindrical grinding operations. The spindle radial error motion (SREM) at the grinding position, identified as the dominant error source was modeled by an autoregressive model and compensated for by a forecasting algorithm. A digital method for measuring SREM at the grinding position which incorporates master roundness compensation was proposed and a piezo-electric drive system for the generation of the compensatory mechanical motion was developed. The implementation of the proposed method resulted in a substantial improvement of workpiece roundness.

A Computer Program Design for Optimization of a Cylindrical Traverse Grinding Operations

2009 ◽  
Vol 147-149 ◽  
pp. 387-392
Author(s):  
Andrejus Henrikas Marcinkevičius
Keyword(s):  
Computer Program ◽  
Program Design ◽  
Task Complexity ◽  
Process Plan ◽  
Cylindrical Grinding ◽  
Grinding Operations ◽  
Manual Calculation ◽  
Traverse Grinding

Traverse cylindrical grinding productivity and accuracy depend on many factors of rough, fine and spark out grinding. Evaluation of all these factors at manual calculation of the process plan is impossible, for that reason the engineer technologist selects the cutting rates approximately, and they are far from optimal. We have deduced equations for calculation of optimal cutting rates for that purpose. Because of task complexity the computer program was designed for calculations which is described in this paper.

Study of Dynamic Simulation on Driving System and Modeling Motor for Electric Drive Application of Armored Vehicles

2014 ◽  
Vol 543-547 ◽  
pp. 286-290
Author(s):  
Zi Li Liao ◽  
Gui Bing Yang ◽  
Jia Qi Li ◽  
Ming Zhao
Keyword(s):  
Control System ◽  
Dynamic Simulation ◽  
Electric Drive ◽  
Mathematic Model ◽  
Permanent Magnet Motor ◽  
Driving System ◽  
Electric Drive System ◽  
Interior Permanent Magnet ◽  
Armored Vehicle ◽  
Interior Permanent Magnet Motor

Establish an IPM(Interior Permanent Magnet) motor mathematic model based on saturated inductance parameters. This model aimed at the traction motor of electric drive system of a certain armored vehicle. Driving control system was established on SIMULINK platform, and the consequence was analyzed.

scholarly journals Neuro-Fuzzy Control of a Robotic Manipulator

2014 ◽  
Vol 19 (3) ◽  
pp. 575-584 ◽  
Author(s):  
P. Gierlak ◽  
M. Muszyńska ◽  
W. Żylski
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Control System ◽  
Intelligent Control ◽  
Fuzzy System ◽  
Operating Conditions ◽  
Intelligent Control System ◽  
Hybrid Controller ◽  
Compensatory Control ◽  
Neuro Fuzzy

Abstract In this paper, to solve the problem of control of a robotic manipulator’s movement with holonomical constraints, an intelligent control system was used. This system is understood as a hybrid controller, being a combination of fuzzy logic and an artificial neural network. The purpose of the neuro-fuzzy system is the approximation of the nonlinearity of the robotic manipulator’s dynamic to generate a compensatory control. The control system is designed in such a way as to permit modification of its properties under different operating conditions of the two-link manipulator

Study on the influence of machine tool spindle radial error motion resulted from bearing outer ring tilting assembly

2018 ◽  
Vol 233 (9) ◽  
pp. 3246-3258 ◽  
Author(s):  
Xiaohu Li ◽  
Ke Yan ◽  
Yifa Lv ◽  
Bei Yan ◽  
Lei Dong ◽  
...  
Keyword(s):  
Rotation Speed ◽  
Total Error ◽  
Experimental System ◽  
Outer Ring ◽  
Operation Condition ◽  
Thermal Displacement ◽  
Radial Error ◽  
Spindle Rotation ◽  
Motion Characteristics ◽  
Error Motion

To reveal the spindle radial error motion characteristics in condition of bearing outer ring tilting assembly, mathematical method on spindle radial error motion were analyzed. Then, in real operation condition the natural frequency of the test rig was investigated. Experimental system and methods were designed to test axial thermal displacement, radial error motion and modal characteristic of spindle in condition of bearing outer ring tilting assembly. Results show that axial thermal extension and radial vertical rising of spindle front-end occurs during thermal displacement test. With the same outer spacer nonparallelism, the synchronous error motion and total error motion generally increase with spindle rotation speed, and reach a peak at certain rotation speed.

Analysis of error motions of axial locking-prevention hydrostatic spindle

2018 ◽  
Vol 233 (1) ◽  
pp. 3-17
Author(s):  
Penghai Zhang ◽  
Yaolong Chen
Keyword(s):  
Significant Influence ◽  
Harmonic Component ◽  
Necessary Condition ◽  
Third Harmonic ◽  
The Third ◽  
Fourth Harmonic ◽  
Radial Error ◽  
Tilt Error ◽  
Error Motion ◽  
Error Averaging

Hydrostatic spindles are widely used in precision optical grinder and lathe. Their high precision comes from the error averaging effect of oil film. The purpose of this paper is to give the quantitative analysis of the error averaging effect for a newly developed axial locking-prevention hydrostatic spindle. An approximate error motion model of the hydrostatic spindle is established to analyze the internal relationship between the geometric errors of the shaft and the error motions of the spindle including radial, tilt and axial error motions. The theoretical analysis shows that, the roundness errors of the two journals have a major impact on error motions while the coaxiality errors of two journals, the perpendicularity errors of front thrust plate and the coaxiality errors of the land of back thrust bearing, have no significant influences on error motions. The elliptical component of roundness errors of the two journals has significant influence on the axial error motion but no influence on the pure radial and tilt error motions, resulting into the fourth harmonic component of axial error motion. The trilobal component of roundness errors of the two journals has significant influence on the pure radial and tilt error motions but no influence on the axial error motion, resulting in the third harmonic component of pure radial and tilt error motions. The changes of recess pressures are not necessary condition for the error motions. Additionally, the experiment analysis shows that, the third harmonic component is the main part of the measured radial error motion and the third, fourth harmonic components are the main parts of the measured face error motion, which can be reasonably explained by the theory. The model proposed in this paper can be used to guide the precision design and optimization of hydrostatic spindle.

Evaluation Method to Determine Radial Error of Spindle Units on Simulation Turntable

2011 ◽  
Vol 460-461 ◽  
pp. 311-316
Author(s):  
Zhi Yong Qu ◽  
Jun Wei Han
Keyword(s):  
Small Angle ◽  
Evaluation Method ◽  
Simulation System ◽  
Transformation Matrix ◽  
Hardware In The Loop ◽  
Error Sources ◽  
Know How ◽  
Form Errors ◽  
Radial Error ◽  
Error Motion

Many errors including radial error influence the accuracy of simulation turntable, which is a crucial equipment in hardware-in-the-loop simulation system. The aim of this paper is to propose a new method of radial error motion separation of rotating spindle on a simulation turntable. Based on transformation matrix and small angle approximation, gesture transformation matrix with various error items is achieved. As a result of this analysis, form errors of master ball are corrected and the eccentricity from the rotation error of a spindle is separated. This radial error analysis is carried out when this measurement result is applied to a simulation turntable. Furthermore, this study also permits the user to know how to minimize some error sources of the spindle system.

Measurement and Analysis of Radial Error Motion of a Miniature Ultra-High-Speed Spindle

2008 ◽  
Vol 381-382 ◽  
pp. 73-76
Author(s):  
Kengo Fujimaki ◽  
Kimiyuki Mitsui
Keyword(s):  
High Speed ◽  
Signal To Noise Ratio ◽  
High Signal ◽  
Signal To Noise ◽  
Measuring Device ◽  
Radial Error ◽  
Optical Measuring ◽  
Ultra High Speed ◽  
Measurement And Analysis ◽  
Error Motion

The optical measuring device developed in this study is based on laser autocollimation and can measure the radial error motions of a miniature ultra-high-speed spindle having a maximum rotational speed of 200 krpm. The maximum response frequency of this optical measuring device is over 500 kHz, while the frequency of the radial error motion at 200 krpm is 3.33 kHz for 1 undulation per revolution (upr), and 333 kHz for 100 upr. In addition, the optical measuring device is capable of a highly detailed analysis of the radial error motion of a miniature ultra-high-speed spindle since it has a high signal-to-noise ratio due to little susceptibility to electrical noises.

Study on Compensation of Guide Track Error in Cylindrical Grinding

2012 ◽  
Vol 482-484 ◽  
pp. 2076-2080
Author(s):  
Jian Liang Guo ◽  
Zhe Heng Zhang ◽  
Lian Qing Chen ◽  
Jun Chi ◽  
Xun Yang
Keyword(s):  
Relative Motion ◽  
Error Compensation ◽  
Compensation System ◽  
Experimental Results ◽  
Error Source ◽  
Static Error ◽  
Track Error ◽  
Cylindrical Grinding ◽  
Direction Error ◽  
Grinding Machine

Due to existence of relative motion between the grinding machine body and working table, the manufacturing error of guide track would result in a considerable grinding error inevitably. Thus the guide direction error becomes the most important static error source for longitudinal cylindrical grinding. In this paper, an error compensation system based on industrial computer was developed and used to counteract the guide direction error. In order to verify the performance of the proposed system, several grinding experiments were carried out. The experimental results show that the grinding error due to guide track error reduces by about 33% using the error compensation system.

An In-Process Flatness Error Measurement and Compensatory Control System

1988 ◽  
Vol 110 (3) ◽  
pp. 263-270 ◽  
Author(s):  
C. W. Park ◽  
K. F. Eman ◽  
S. M. Wu
Keyword(s):  
Control System ◽  
Measurement System ◽  
Error Measurement ◽  
Measurement And Control System ◽  
Process Measurement ◽  
Compensatory Control ◽  
And Control ◽  
Measurement And Control ◽  
Flatness Error

The principles of a new in-process measurement and control system for flatness errors in machining have been introduced. The laser-based system consists of a stylus, a geometrical table measurement system, and a forecasting compensatory controller. Through the application of the proposed system to simulated and actual cutting data it has been shown that improvements of flatness on the order of 80 percent are feasible.

Adaptive Fuzzy Neural Network Control System in Cylindrical Grinding Process

2010 ◽  
Vol 426-427 ◽  
pp. 220-224
Author(s):  
X.M. Li ◽  
Ning Ding
Keyword(s):  
Neural Network ◽  
Control System ◽  
Fuzzy Neural Network ◽  
Network Control ◽  
Grinding Process ◽  
Neural Network Control ◽  
Network Control System ◽  
Cylindrical Grinding ◽  
Adaptive Fuzzy Neural Network ◽  
Fuzzy Neural

An adaptive fuzzy neural network control system in cylindrical grinding process was proposed. In this system, the initial cylindrical grinding parameters were decided by the expert system based on fuzzy neural network. Multi-feed and setting overshoot optimization methods were also adopted during the grinding process, and a human machine cooperation system (composed of human and two fuzzy – neural networks) could revise the process parameters in real-time. The experiment of the cylindrical grinding was implemented. The results showed that this control system was valid, and could greatly improve the cylindrical grinding quality and machining efficiency.

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