Cutting Force-Based Feedback Control Scheme for Surface Finish Improvement in Diamond Turning

1993 ◽  
Author(s):  
Sanghwa Jeong ◽  
Paul I. Ro
Keyword(s):  
Feedback Control ◽  
Cutting Force ◽  
Surface Finish ◽  
Diamond Turning ◽  
Control Scheme

Extended state observer–based output feedback control for spacecraft pose tracking with control input saturation

2021 ◽  
pp. 095441002110177
Author(s):  
Kejie Gong ◽  
Ying Liao ◽  
Yafei Mei
Keyword(s):  
Feedback Control ◽  
Output Feedback ◽  
Finite Time ◽  
Output Feedback Control ◽  
State Observer ◽  
Extended State Observer ◽  
Control Input ◽  
Extended State ◽  
Pose Tracking ◽  
Control Scheme

This article proposed an extended state observer (ESO)–based output feedback control scheme for rigid spacecraft pose tracking without velocity feedback, which accounts for inertial uncertainties, external disturbances, and control input constraints. In this research, the 6-DOF tracking error dynamics is described by the exponential coordinates on SE(3). A novel continuous finite-time ESO is proposed to estimate the velocity information and the compound disturbance, and the estimations are utilized in the control law design. The ESO ensures a finite-time uniform ultimately bounded stability of the observation states, which is proved utilizing the homogeneity method. A non-singular finite-time terminal sliding mode controller based on super-twisting technology is proposed, which would drive spacecraft tracking the desired states. The other two observer-based controllers are also proposed for comparison. The superiorities of the proposed control scheme are demonstrated by theory analyses and numerical simulations.

Experimental Investigation of Microcutting Mechanisms in Marble Grinding

2009 ◽  
Vol 131 (6) ◽  
Author(s):  
LJ. Tanovic ◽  
P. Bojanic ◽  
R. Puzovic ◽  
S. Klimenko
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Cutting Force ◽  
Surface Finish ◽  
Normal Component ◽  
Natural Material ◽  
Grinding Process ◽  
Force Component ◽  
Diamond Grain

This paper offers an experimental study of the microcutting mechanisms in marble grinding to aid the optimization of the marble grinding process. The necessity for investigating these mechanisms is dictated by the increased use of marble in many applications and the fact that grinding and polishing processes are the dominant technologies used to meet surface finish requirements in this natural material. The experiments are aimed at the determination of the normal component of the cutting force and of the grain traces in microcutting with a single diamond grain. The investigations carried out make provisions for establishing critical grain penetration and cutting depths and allow the prediction of the normal cutting force component as a function of grain penetration speed and depth.

Simulations of a Feedback Control Scheme for an Inductively Coupled Plasma Source for Etching Applications

1996 ◽  
Vol 143 (4) ◽  
pp. 1375-1383 ◽  
Author(s):  
Naoki Yamada ◽  
Peter L. G. Ventzek ◽  
Y. Sakai ◽  
H. Tagashira ◽  
K. Kitamori
Keyword(s):  
Feedback Control ◽  
Inductively Coupled Plasma ◽  
Plasma Source ◽  
Inductively Coupled ◽  
Control Scheme

Turned Aluminium Alloys Surface Finish Monitoring through Cutting Force Measurements

2002 ◽  
Vol 4 (4) ◽  
pp. 211-220
Author(s):  
M.A. Sebastian, ◽  
J.M. Sanchez-Sola, ◽  
J.M. Gonzalez, ◽  
M.S. Carrilero, ◽  
M. Alvarez, ◽  
...  
Keyword(s):  
Cutting Force ◽  
Surface Finish ◽  
Aluminium Alloys ◽  
Force Measurements

Mixed Strategy Global Sub-Optimal Feedback Control for Chaotic Systems

1997 ◽  
Vol 07 (03) ◽  
pp. 607-623 ◽  
Author(s):  
H. W. J. Lee ◽  
M. Paskota ◽  
K. L. Teo
Keyword(s):  
Feedback Control ◽  
State Space ◽  
Chaotic Systems ◽  
Mixed Strategy ◽  
The State ◽  
Optimal Feedback Control ◽  
Target Region ◽  
Optimal Feedback ◽  
Control Scheme

How to perform targeting of chaotic systems in a global sense is an important question. In this paper, we address this problem by introducing a mixed strategy global sub-optimal feedback control scheme. The idea is to partition the state space into 2 parts, namely, the target region and its complement. The proposed controller will take different forms depending on which partition of the state space the system is in. Simulations are also provided to illustrate the proposed scheme.

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