Modeling of Micro-Positioning System Using Direct Mapping and Polynomial Fit for Precision Grinding Process Control

2007 ◽  
Vol 329 ◽  
pp. 791-796
Author(s):  
S. Tse ◽  
Y. Gao
Keyword(s):  
Process Control ◽  
Experimental Studies ◽  
Piezoelectric Constant ◽  
Grinding Process ◽  
Modeling Error ◽  
Precision Grinding ◽  
Positioning Systems ◽  
Direct Mapping ◽  
Polynomial Fit ◽  
Command Signals

For micro-positioning systems using piezoelectric actuators for precision grinding process control, sinusoidal command signals will be used and will give additional problems in comparison with the commonly used step signals due to the hysteresis effects, which require a good modeling approach. In order to avoid the discontinuity problem in obtaining the values of the piezoelectric constant, a new approach of direct mapping with polynomial fit is proposed. Theoretical and experimental studies are conducted and comparative studies are made. Compared with the single polynomial approach, the proposed method of direct mapping with polynomial fit is able to reduce the modeling error to 12.5%, which is 6.5% lower, and the problems in obtaining the values of the piezoelectric constant are avoided. The proposed approach is shown advantageous. Further studies are necessary to significantly reduce the modeling error.

Modeling of Piezoelectric Actuator Based Nano-Positioning System Using Multi-Polynomial Regression with C1 Continuity

2007 ◽  
Vol 339 ◽  
pp. 434-441 ◽  
Author(s):  
S. Tse ◽  
Y. Gao
Keyword(s):  
Piezoelectric Actuator ◽  
Polynomial Regression ◽  
Piezoelectric Actuators ◽  
Zero Order ◽  
Positioning System ◽  
Modeling Error ◽  
Order Continuity ◽  
Positioning Systems ◽  
First Order ◽  
Command Signals

For nano-positioning systems with piezoelectric actuators used for dynamic grinding control, sinusoidal command signals will used and will give additional problems compared with the commonly used step signals because of the hysteresis effects, which require a good modeling approach. The proposed approach of multiple polynomial regression with first order continuity gives a relative modeling error of 2.65%. The method reduces the error by 26.3-80.2% in comparison with the methods using the single, dual, and multiple polynomial regression with zero order continuity.

scholarly journals RESEARCH OF PHYSICAL AND MECHANICAL PROPERTIES OF WOOD-FIBER MATERIALS

2020 ◽  
pp. 451-457
Author(s):  
Aleksandr Yur'yevich Vititnev ◽  
Yuriy Davydovich Alashkevich ◽  
Natal'ya Geral'dovna Chistova ◽  
Roman Aleksandrovich Marchenko ◽  
Venera Nurullovna Matygullina
Keyword(s):  
Mechanical Properties ◽  
Wood Fiber ◽  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Production Method ◽  
Strength Properties ◽  
Grinding Process ◽  
Technological Parameters ◽  
Fiber Materials ◽  
Traditional Construction

This paper presents the results of experimental studies of the physical and mechanical properties of wood-fiber boards of the wet production method when regulating the design and technological parameters of the grinding process. This allowed us to determine the influence of the working clearance between the grinding discs and the concentration of fibre mass with the subject to of quality change wood fiber after defibrator using the developed construction of the disc fibrillation action on the physico-mechanical properties of boards. As a result of the experiment, regression models were obtained that adequately describe the studied grinding process and allow predicting the values of physical and mechanical properties of the finished product depending on the established  parameters process. A comparative analysis of the size and quality characteristics of the fiber semi-finished product and its fractional composition when using a developed construction the disc of refiner fibrillation action and a traditional design used in industry is carried out. The preferential efficiency of the grinding process under the fibrillating effect the disc of refiner in comparison with the traditional construction disc of refiner is established. As a result, there is a significant improvement in the quality indicators of the fiber semi-finished product and its composition due to the formation and predominance in the total mass of long and thin, respectively, flexible fibrillated fibers with high tile-forming properties, which allows to increase the strength properties of the product (by 20–25%), without using binding resins.

Ensuring the accuracy of aircraft parts by the VST method

2021 ◽  
pp. 491-494
Author(s):  
V.A. Lebedev ◽  
M.A. Belozerov ◽  
A.Yu. Mazovka
Keyword(s):  
Process Control ◽  
Experimental Studies ◽  
Control Model ◽  
Geometric Accuracy

The regularities of the violation of the geometric accuracy of parts are considered, technological schemes for experimental studies of the VST process are suggested, and the structure of the process control model is determined.

Does the nervous system depend on kinesthetic information to control natural limb movements?

1992 ◽  
Vol 15 (4) ◽  
pp. 614-632 ◽  
Author(s):  
S. C. Gandevia ◽  
David Burke
Keyword(s):  
Human Subjects ◽  
Experimental Studies ◽  
Human Movement ◽  
Cutaneous Afferents ◽  
Motor Commands ◽  
Target Article ◽  
Natural Movement ◽  
Command Signals ◽  
Kinesthetic Information

Abstract This target article draws together two groups of experimental studies on the control of human movement through peripheral feedback and centrally generated signals of motor commands. First, during natural movement, feedback from muscle, joint, and cutaneous afferents changes; in human subjects these changes have reflex and kinesthetic consequences. Recent psychophysical and microneurographic evidence suggests that joint and even cutaneous afferents may have a proprioceptive role. Second, the role of centrally generated motor commands in the control of normal movements and movements following acute and chronic deafferentation is reviewed. There is increasing evidence that subjects can perceive their motor commands under various conditions, but that this is inadequate for normal movement; deficits in motor performance arise when the reliance on proprioceptive feedback is abolished either experimentally or because of pathology. During natural movement, the CNS appears to have access to functionally useful input from a range of peripheral receptors as well as from internally generated command signals. The unanswered questions that remain suggest a number of avenues for further research.

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