A Compensation Method of Abrasive Surface Error Based on the Piezoelectric Feed

2013 ◽  
Vol 669 ◽  
pp. 283-291
Author(s):  
Fei Wu ◽  
Xiao Jian Chen ◽  
Jia Mei Jin
Keyword(s):  
Multilayer Structure ◽  
Piezoelectric Ceramic ◽  
Piezoelectric Effect ◽  
Active Deformation ◽  
Surface Error ◽  
Dc Voltage ◽  
Inverse Piezoelectric Effect ◽  
Tool Surface ◽  
Abrasive Surface ◽  
Deformation Compensation

The piezoelectric ceramic has inverse piezoelectric effect, which can be used in the manufacture of the mold internal compensation-driven. We design a multilayer structure with built-in array of piezoelectric ceramic to achieve active deformation to compensate the tool-shaped face. A piezoelectric micro-displacement compensation model is proposed based on the inverse piezoelectric effect of piezoelectric ceramic. According to the initial face error of tool or from wear, a certain amount of DC voltage is applied on the corresponding area of the piezoelectric ceramic elements to produce certain amount of shrinkage, achieving the goal to adjust tool surface. Based on this theory, we develop a device with active deformation compensation and propose an optimization algorithm of applied voltage.

The Displacement Characteristics of Piezoelectric Ceramic Micro Actuators Evaluated by Laser Interferometer

2015 ◽  
Vol 645-646 ◽  
pp. 920-925 ◽  
Author(s):  
Hong Wu ◽  
Long Biao He ◽  
Jing Lin Zhou ◽  
Ping Yang
Keyword(s):  
Piezoelectric Ceramic ◽  
Piezoelectric Coefficient ◽  
Laser Interferometer ◽  
Piezoelectric Effect ◽  
Influence Factors ◽  
Energy Transformation ◽  
Measurement Results ◽  
Loading Sequence ◽  
Converse Piezoelectric Effect ◽  
Key Parameter

Understanding and measuring the displacement characteristics of piezoelectric ceramic with electric field exciting are particularly important. The piezoelectric coefficient d33 as the indication of its displacement characteristics, is the key parameter of its energy transformation. In this paper, the characteristics of two kinds of piezoelectric ceramics, PZT4 and PZT5 were studied by the laser interferometer measurement. The influence factors of d33 were studied, including the frequency and amplitude of the exciting signal, the ways of holding, and the loading sequence. Then the measurement results of piezoelectric ceramic with laser interferometer and the quasi-static method were compared, the results showed they had consistence and the analysis of the piezoelectric coefficient d33 measurement by converse piezoelectric effect and by piezoelectric effect was discussed.

The method of bolt axial force looseness monitoring and control by piezoelectric ceramics in bolted joint structures

2021 ◽  
pp. 095440622110398
Author(s):  
Xinyao Sun ◽  
Jinggan Shao ◽  
Yang Zhou ◽  
Ci Yuan ◽  
Yang Li ◽  
...  
Keyword(s):  
Finite Element ◽  
Active Control ◽  
Axial Force ◽  
Piezoelectric Ceramic ◽  
Control Method ◽  
Piezoelectric Effect ◽  
Guided Wave ◽  
Clamping Force ◽  
Monitoring And Control ◽  
Wave Signal

Aiming at the problem of bolt looseness in structures, this paper proposes an active control method of axial force monitoring through guided wave and axial force compensation via the inverse piezoelectric effect of a piezoelectric ceramic gasket. Based on the finite element model, the propagation process of guided wave wave in bolted connectors is analyzed, which shows that the transmitted wave energy increases with the increase of bolt clamping force. The analysis of the stress-strain characteristics of the axially polarized and radially polarized piezoelectric ceramic gasket shows that the axially polarized piezoelectric ceramic gasket is more suitable for the control of bolt clamping force. The finite element analysis of the application of piezoelectric ceramic gasket in bolt axial force control shows that the power of guided wave signal increases monotonously with the increase of loaded electric field strength. In accordance with these theoretical methods and research, an active control system for bolt axial force is established in this experiment. The system monitors the power of the guided wave signal in real time and controls the axial force of the bolt by adjusting the intensity of the piezoelectric effect, which achieves an accurate control effect.

A Markovian Finishing Process

2008 ◽  
Vol 130 (2) ◽  
Author(s):  
M. A. S. Mohamed
Keyword(s):  
Triangular Form ◽  
Workpiece Surface ◽  
Finishing Process ◽  
Tool Surface ◽  
Markov Matrix ◽  
Abrasive Surface ◽  
Matrix Mapping ◽  
Abrasive Tools ◽  
Finishing Processes ◽  
Abrasive Paper

Addressed is the mechanism of finishing processes for a workpiece surface using hard abrasive tools such as grinding, abrasive paper, and filing. The mechanism is intended to monitor the gradual changes of the workpiece surface state roughness as the tool is applied for several strokes. Based on a number of common features, the present study simulates each rubbing stroke as a Markov process, and each set of several strokes as a Markov chain. In the simulating model, the discrete probabilistic properties of a specific tool abrasive surface can be expressed in terms of a corresponding Markov matrix operator. Thus, the tool action after one rubbing stroke is obtained via a matrix mapping from a given state roughness to a subsequent state roughness of the workpiece surface. Although the suggested model is capable to handle a comprehensive finishing mechanism, the study focuses on the simple case of zero feeding using a hard abrasive tool, in which the Markov matrix shrinks to a special triangular form. Main findings show that major aspects of the tool surface are transferred to the stepwise roughness state of the workpiece immediately after the first stroke. In addition, regardless of the initial roughness state of the workpiece surface, whether with flat or randomly distributed heights, the ultimate state roughness is unique and definitely features the theoretical case of a plain flat surface. However, this theoretical case is infeasible since it can only be reached after infinite number of strokes.

Testing System of Needle Selectors for Jacquard Knitting Machines

2013 ◽  
Vol 397-400 ◽  
pp. 1174-1177
Author(s):  
Jie Ma ◽  
Xiao Feng Zha ◽  
Hai Bin Tao ◽  
Jun Fang Ni
Keyword(s):  
Control System ◽  
Working Conditions ◽  
Piezoelectric Effect ◽  
Testing System ◽  
C Language ◽  
Inverse Piezoelectric Effect

Based on piezoelectric theory of computer jacquard circular knitting machines, the needle selectors are analyzed under various complicated working conditions. According to characteristics of the inverse piezoelectric effect, the control system for needle mechanisms is designed and the driving program is implemented by C language, which is used to test the functions of needle mechanisms.

Sign in / Sign up

Export Citation Format

Share Document