Article
Physics, Applied
Zekun Chen, Xin Yang, Shuxun Li, Zhihe Zhang, Yukai Chen
Summary: This paper proposes a magnetic equivalent network considering flux leakage and fringing effect, as well as a multi-field coupling model, to predict the tracking behaviors of stack giant magnetostrictive actuators (SGMAs) to excitation signals. Experimental results verify the accuracy of these two models.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Computer Science, Artificial Intelligence
Xiuyu Zhang, Bin Li, Zhi Li, Chenguang Yang, Xinkai Chen, Chun-Yi Su
Summary: Hysteresis is a complex nonlinear effect that can degrade the positioning performance of smart material-based actuators, especially when it exhibits asymmetric characteristics. To address this issue, an adaptive neural digital dynamic surface control scheme with an implicit inverse compensator is proposed in this article. The implicit inverse compensator is used to find the compensation signal by searching the optimal control laws from the hysteresis output, eliminating the need for an inverse hysteresis model. The adaptive neural digital controller ensures the semiglobally uniformly ultimately bounded (SUUB) behavior of all signals in the closed-loop control system.
IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS
(2022)
Article
Automation & Control Systems
Long Chen, Yuchuan Zhu, Jie Ling, Mingming Zhang
Summary: In this article, a multidimensional discrete magnetostrictive actuator (MDMA) was developed to address the requirements of active combustion control in aero engine combustion chambers. The MDMA, which adopts a discrete structure, is capable of meeting the high bandwidth, high power density, and large output displacement simultaneously. Experimental results demonstrate that the MDMA can reach a stroke of 100 μm and exceed a working bandwidth of 1000 Hz. Closed-loop control tests also indicate that the MDMA can effectively track sinusoidal references of different amplitudes under low frequency with a feedback PID controller.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2022)
Article
Polymer Science
Huagao Fang, Fan Zhang, Yongpu Zhao, Xingchen Gao, Wenjuan Zhou, Guobin Qi, Yunsheng Ding, H. Henning Winter
Summary: Liquid crystal elastomer networks (LCEs) are highly versatile materials with unique mechanical and optical properties. The addition of dynamic covalent bonds allows for network renewal and further opportunities. Through increasing the content of liquid crystal mesogens (LCM), elastomeric vitrimer epoxies (EV, m-EV, and vLCE) were synthesized with varying rheological properties. The specific contributions of the smectic structure in vLCE were discussed, and the underlying mechanisms were explored.
Article
Engineering, Mechanical
Luigi Allocca, Daniele Davino, Alessandro Montanaro, Ciro Visone
Summary: This paper introduces a concept fuel injector based on Terfenol-D magnetostrictive actuator, which can achieve the trade-off between NOx and soot in a simple and controllable way.
Article
Chemistry, Physical
Xiaofang Ye, Hongkun Cai, Tie Xu, Jian Ni, Jianjun Zhang
Summary: In recent years, perovskite solar cells (PSCs) have gained increasing attention. However, defects have been a major factor affecting the efficiency and stability of PSCs. This study introduces an ionic liquid (IL) at the SnO2/perovskite interface, which reduces the work function of SnO2 and improves carrier transport. The IL also contributes to defect passivation, reducing recombination and improving the overall efficiency and stability of the solar cell.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Materials Science, Composites
Zhenjun Yang, Zhenjin Wang, Kenya Nakajima, Daiki Neyama, Fumio Narita
Summary: This study investigates the effect of structural design on the magnetostrictive properties of FeCo/epoxy composites by preparing two groups with different FeCo wire shapes. By analyzing the magnetization and magnetostrictive curves, the study provides insights into the mechanism responsible for improving magnetostriction. The research offers a new concept for improving magnetostrictive properties and avoids potential reductions in magnetostriction seen in traditional composites.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Bin Xu, Chuanli Wang, Liping Wang, Yingsong Cheng, Xiumiao Yang
Summary: The study demonstrates that the displacement curve calculated by the GMA magnetostrictive model is basically consistent with the one measured experimentally, confirming the model's accuracy. The magnitude and direction of GMI needle valve lift are determined by the GMA output displacement, with opposite directions and a ratio of 4.
Article
Automation & Control Systems
Xiuyu Zhang, Yuehang Liu, Xinkai Chen, Zhi Li, Chun-Yi Su
Summary: This article proposes an adaptive pseudoinverse control scheme based on fuzzy logic system (FLS) and barrier Lyapunov function (BLF) for a class of state-constrained hysteretic nonlinear systems. The hysteresis nonlinearity in the actuators is considered and mitigated by the proposed pseudoinverse control algorithms. The all-state-constrained control problem of the Preisach hysteresis model is overcome with the aid of an FLS, BLFs, and the proposed hysteresis pseudoinverse algorithms.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2023)
Article
Acoustics
Yuesong Li
Summary: Due to its excellent performance, the giant magnetostrictive actuator is used in active vibration isolation control systems. However, its complex hysteresis nonlinear dynamic model hampers engineering practical applications, so an accurate and user-friendly model is necessary. A magnetic circuit model and a nonlinear dynamic physical model of the giant magnetostrictive actuator are developed using Simulink/Simcape. The optimization of the magnetic circuit focuses on uniform distribution and magnetic energy utilization, with design criteria provided. The hysteresis performance between current and magnetization is analyzed through simulation. A linear magnetostrictive model is established to reflect the effects of frequency doubling and preload, and the accuracy of the nonlinear dynamic physical model is verified through experiments where it aligns well with results under both quasistatic and dynamic operating conditions, with an output displacement error of less than 0.6 μm for the giant magnetostrictive actuator under step response.
SHOCK AND VIBRATION
(2023)
Article
Chemistry, Multidisciplinary
Raul Diaz-Torres, Guillaume Chastanet, Eric Collet, Elzbieta Trzop, Phimphaka Harding, David J. Harding
Summary: The influence of solvent on the spin crossover behavior of two solvates [Fe(qsal-I)(2)]NO(3 center dot)2ROH (qsal-I = 4-iodo-2-[(8-quinolylimino)methyl]phenolate; R = Me 1 or Et 2) is investigated. Solvate 1 undergoes a symmetry-breaking phase transition from a [HS] to [HS-LS] state at 210 K, while the EtOH solvate shows complete spin crossover at T-1/2 = 250 K. The MeOH solvate exhibits LIESST and reverse-LIESST from the [HS-LS] state, revealing a hidden [LS] state. Photocrystallographic studies on solvate 1 reveal re-entrant photoinduced phase transitions to a high symmetry [HS] phase or a high symmetry [LS] phase under irradiation at 980 nm or 660 nm, respectively. This study presents the first example of bidirectional photoswitchability and subsequent symmetry-breaking from a [HS-LS] state in an iron(III) spin crossover material.
Article
Mechanics
You-Shu Zhan, Chien-hong Lin
Summary: This study investigates the magneto-thermo-mechanical coupled hysteresis responses of magnetostrictive composites under cyclic magnetic field loading in various thermal environments. By using micromechanics models and experimental data validation, the study provides insights into optimizing the performance of magnetostrictive composites.
COMPOSITE STRUCTURES
(2021)
Article
Multidisciplinary Sciences
Zhang Chen, Roos Arwen Doekemeijer, Xavier Noel, Frederick Verbruggen
Summary: Loss-chasing is a defining feature of gambling disorder. In real gambling contexts, it can be expressed in the decision of when to stop, how much stake to bet, and the speed of play. A large-scale study using player-tracking data found that after winning, players were less likely to stop and increased their stake amount, indicating win-chasing. After losing, players played more quickly, reflecting an urge to continue gambling.
Article
Instruments & Instrumentation
Keping Liu, Shuai Yu, Zhenguo Zhang, Piao Fan, Tinghai Cheng, Xiaohui Lu
Summary: In this paper, a composite control strategy combining stepping and scanning modes is proposed to overcome the difficulties in achieving nanopositioning over large travel and the negative effects of hysteresis characteristics and external disturbances. An integral back-stepping linear active disturbance rejection control (IB-LADRC) strategy is introduced in the scanning mode, which uses a linear extended state observer to estimate displacement, velocity, and total disturbance in real time. Simulation and experimental results demonstrate that the IB-LADRC algorithm effectively improves the positioning accuracy of the PSSNS system.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Automation & Control Systems
Yue Wang, Xiuyu Zhang, Shunjiang Wang, Zhi Li, Xinkai Chen, Chun-Yi Su
Summary: This article proposes a decentralized adaptive implicit inverse control scheme based on fuzzy-logic systems (FLSs) for a class of large-scale nonlinear systems with time delays and multihysteretic loops. The novel algorithms feature hysteretic implicit inverse compensators to mitigate multihysteretic loops effectively. The authors provide three contributions: 1) a searching mechanism to obtain the approximate value of the practical input signal from the hysteretic temporary control law; 2) the attainment of arbitrarily small L∞ norm of the tracking error by utilizing the proposed initializing technique, which combines FLSs and a finite covering lemma to deal with time delays; and 3) the construction of a triple-axis giant magnetostrictive motion control platform to validate the effectiveness of the proposed control scheme and algorithms.
IEEE TRANSACTIONS ON CYBERNETICS
(2023)
