scholarly journals Modeling and Compensation for Asymmetrical and Dynamic Hysteresis of Piezoelectric Actuators Using a Dynamic Delay Prandtl–Ishlinskii Model

Micromachines ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 92
Author(s):  
Wen Wang ◽  
Fuming Han ◽  
Zhanfeng Chen ◽  
Ruijin Wang ◽  
Chuanyong Wang ◽  
...  
Keyword(s):  
High Frequency ◽  
Piezoelectric Actuators ◽  
Superior Performance ◽  
Precision Machining ◽  
Nonlinear Phenomena ◽  
Input Frequency ◽  
Hysteresis Model ◽  
Inverse Dynamic ◽  
Dynamic Hysteresis ◽  
Play Operator

Piezoelectric actuators are widely used in micro- and nano-manufacturing and precision machining due to their superior performance. However, there are complex hysteresis nonlinear phenomena in piezoelectric actuators. In particular, the inherent hysteresis can be affected by the input frequency, and it sometimes exhibits asymmetrical characteristic. The existing dynamic hysteresis model is inaccurate in describing hysteresis of piezoelectric actuators at high frequency. In this paper, a Dynamic Delay Prandtl–Ishlinskii (DDPI) model is proposed to describe the asymmetrical and dynamic characteristics of piezoelectric actuators. First, the shape of the Delay Play operator is discussed under two delay coefficients. Then, the accuracy of the DDPI model is verified by experiments. Next, to compensate the asymmetrical and dynamic hysteresis, the compensator is designed based on the Inverse Dynamic Delay Prandtl–Ishlinskii (IDDPI) model. The effectiveness of the inverse compensator was verified by experiments. The results show that the DDPI model can accurately describe the asymmetrical and dynamic hysteresis, and the compensator can effectively suppress the hysteresis of the piezoelectric actuator. This research will be beneficial to extend the application of piezoelectric actuators.

scholarly journals Fast computation and practical use of amplitudes at non-Fourier frequencies

2021 ◽  
Author(s):  
Erhard Reschenhofer ◽  
Manveer K. Mangat
Keyword(s):  
High Frequency ◽  
Superior Performance ◽  
High Frequency Data ◽  
Mean Square ◽  
Fast Computation ◽  
Efficient Computation ◽  
Frequency Data ◽  
Second Stage ◽  
Orthogonality Conditions ◽  
Memory Parameter

AbstractIn this paper, it is shown that the performance of various frequency-domain estimators of the memory parameter can be boosted by the inclusion of non-Fourier frequencies in addition to the regular Fourier frequencies. A fast two-stage algorithm for the efficient computation of the amplitudes at these additional frequencies is presented. In the first stage, the naïve sine and cosine transforms are computed with a modified version of the Fast Fourier Transform. In the second stage, these transforms are amended by taking the violation of the standard orthogonality conditions into account. A considerable number of auxiliary quantities, which are required in the second stage, do not depend on the data and therefore only need to be computed once. The superior performance (in terms of root-mean-square error) of the estimators based also on non-Fourier frequencies is demonstrated by extensive simulations. Finally, the empirical results obtained by applying these estimators to financial high-frequency data show that significant long-range dependence is present only in the absolute intraday returns but not in the signed intraday returns.

scholarly journals PCDRN: Progressive Cascade Deep Residual Network for Pansharpening

2020 ◽  
Vol 12 (4) ◽  
pp. 676 ◽  
Author(s):  
Yong Yang ◽  
Wei Tu ◽  
Shuying Huang ◽  
Hangyuan Lu
Keyword(s):  
High Resolution ◽  
Loss Function ◽  
High Frequency ◽  
Experimental Results ◽  
Superior Performance ◽  
Residual Network ◽  
High Quality ◽  
Convolution Approach ◽  
Visual Assessments ◽  
Coarse To Fine

Pansharpening is the process of fusing a low-resolution multispectral (LRMS) image with a high-resolution panchromatic (PAN) image. In the process of pansharpening, the LRMS image is often directly upsampled by a scale of 4, which may result in the loss of high-frequency details in the fused high-resolution multispectral (HRMS) image. To solve this problem, we put forward a novel progressive cascade deep residual network (PCDRN) with two residual subnetworks for pansharpening. The network adjusts the size of an MS image to the size of a PAN image twice and gradually fuses the LRMS image with the PAN image in a coarse-to-fine manner. To prevent an overly-smooth phenomenon and achieve high-quality fusion results, a multitask loss function is defined to train our network. Furthermore, to eliminate checkerboard artifacts in the fusion results, we employ a resize-convolution approach instead of transposed convolution for upsampling LRMS images. Experimental results on the Pléiades and WorldView-3 datasets prove that PCDRN exhibits superior performance compared to other popular pansharpening methods in terms of quantitative and visual assessments.

scholarly journals A computationally effective dynamic hysteresis model taking into account skin effect in magnetic laminations

2014 ◽  
Vol 435 ◽  
pp. 80-83 ◽  
Author(s):  
O. de la Barrière ◽  
C. Ragusa ◽  
C. Appino ◽  
F. Fiorillo ◽  
M. LoBue ◽  
...  
Keyword(s):  
Skin Effect ◽  
Hysteresis Model ◽  
Dynamic Hysteresis ◽  
Effective Dynamic

scholarly journals Tracking control of piezoelectric actuators using a polynomial-based hysteresis model

AIP Advances ◽  
2016 ◽  
Vol 6 (6) ◽  
pp. 065204 ◽  
Author(s):  
Jinqiang Gan ◽  
Xianmin Zhang ◽  
Heng Wu
Keyword(s):  
Tracking Control ◽  
Piezoelectric Actuators ◽  
Hysteresis Model

Process Optimization of Ultrasonic Shot Peening by Realistic Modeling of Beads Motion

2014 ◽  
Author(s):  
Alexandre Brosse ◽  
Simon Le Moal ◽  
Rémi Lacroix ◽  
Philippe Mourgue ◽  
Vincent Robin ◽  
...  
Keyword(s):  
Numerical Model ◽  
Shot Peening ◽  
High Frequency ◽  
High Speed ◽  
Nuclear Industry ◽  
Input Frequency ◽  
Realistic Modeling ◽  
Ultrasonic Shot Peening ◽  
Small Steel

In the nuclear industry surface mechanical treatments are used in order to improve the surface integrity of the component, which increases their lifetime regarding corrosion and fatigue damages. A good understanding of these processes and their consequences is required to ensure the efficiency and perpetuity of such mitigation treatment. This study focuses on the ultrasonic shot peening process. It consists in shooting at high speed small steel beads on the part to be treated by using a high frequency vibration device. Parameters such as the number and the size of beads, the input frequency and the dimensions of the chamber can induce large ranges of impact velocity and coverage. In order to help manufacturers to control the treatment applied on their components, a numerical model has been developed. It accounts for the shocks of the beads against the walls of the chamber, the peening head and between beads, describing their motions accurately. In this paper, we will introduce the numerical model developed to simulate the motions of beads in the peening chamber. Special attention will be taken to the determination of the restitution rates related to the different materials. Results of the model will be shown for different process parameter (e.g. the number of beads), and a thorough analysis of their effects on the workpiece will be presented, including a comparison with some experimental results.

Modeling and Compensation for Dynamic Hysteresis of Piezoelectric Actuators Based on Lissajous Curve

2022 ◽  
pp. 113353
Author(s):  
Ruijin Wang ◽  
Wen Wang ◽  
Zhanfeng Chen ◽  
Zhiqian Sang ◽  
Chuanyong Wang ◽  
...  
Keyword(s):  
Piezoelectric Actuators ◽  
Dynamic Hysteresis
Sign in / Sign up

Export Citation Format

Share Document