The cosmology and politics of YANZUN YILAOXUE

Yoon, Seokmin

doi:10.16959/jeachy..52.201211.5

Cited by 2 publications

(3 citation statements)

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“…A critical focus in this domain is the optimization of asynchronous motors, pivotal components in fertigation machines, to enhance their dynamic performance and disturbance resistance [3,4]. These machines play a vital role in delivering precise quantities of water and nutrients, crucial for sustainable agricultural practices [5,6]. However, the operation of these machines is often complicated by remote nonlinear and irregular electrical conductivity (EC) disturbances, leading to inefficiencies and inconsistencies in resource distribution [7].…”

Section: Introductionmentioning

confidence: 99%

Application of Disturbance Observer-Based Fast Terminal Sliding Mode Control for Asynchronous Motors in Remote Electrical Conductivity Control of Fertigation Systems

Wang,

Zhao,

Zhang

et al. 2024

Agriculture

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In addressing the control of asynchronous motors in the remote conductivity of fertigation machines, this study proposes a joint control strategy based on the Fast Terminal Sliding Mode Control-Disturbance Observer (FTSMC-DO) system for asynchronous motors. The goal is to enhance the dynamic performance and disturbance resistance of asynchronous motors, particularly under low-speed operating conditions. The approach involves refining the two-degree-of-freedom internal model controller using fractional-order functions to explicitly separate the controller’s robustness and tracking capabilities. To mitigate the motor’s sensitivity to external disturbances during variable speed operations, a load disturbance observer is introduced, employing hyperbolic tangent and Fal functions for real-time monitoring and compensation, seamlessly integrated into the sliding mode controller. To address issues related to low-speed chattering typically associated with sliding mode controllers, this study introduces a revised non-singular fast terminal sliding mode surface. Additionally, guided by fuzzy control principles, the study enables real-time selection of sliding mode approaching law parameters. Experimental results from the asynchronous motor control platform demonstrate that FTSMC-DO control significantly reduces adjustment time and speed fluctuations during operation, minimizing the impact of load disturbances on the system. The system exhibits robust disturbance rejection, improved robustness, and enhanced control capability. Furthermore, field tests validate the effectiveness of the FTSMC-DO system in regulating remote electrical conductivity (EC) levels. The control time is observed to be less than 120 s, overshoot less than 16.1%, and EC regulation within 0.2 mS·cm−1 over a pipeline distance of 120 m. The FTSMC-DO control consistently achieves the desired EC levels with minimal fluctuation and overshoot, outperforming traditional PID and SMC methods. This high level of precision is crucial for ensuring optimal nutrient delivery and efficient water usage in agricultural irrigation systems, highlighting the system’s potential as a valuable tool in modern, sustainable farming practices.

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Section: Introductionmentioning

confidence: 99%

Application of Disturbance Observer-Based Fast Terminal Sliding Mode Control for Asynchronous Motors in Remote Electrical Conductivity Control of Fertigation Systems

Wang,

Zhao,

Zhang

et al. 2024

Agriculture

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“…Meanwhile, junction II has greater contact resistance than junction I because of the relatively long zigzag type edges. [14] For junction III, the conductance resonance peaks are widest and the background is strongest. Thus junction III has weaker conductance resonances than junctions I and II.…”

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confidence: 99%

“…It is believed that the atomic geometry of the junction interface can significantly modify the conductance of the structure. [12,14] From the fabrication's point of view, tapered junctions may be formed in more controllable way. [15] In this Letter, we compare the transport properties of different T-shaped junctions.…”

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confidence: 99%

Resonance Transport of Graphene Nanoribbon T-Shaped Junctions

Kong

Xiong

2010

Chinese Phys. Lett.

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We investigate the transport properties of T-shaped junctions composed of armchair graphene nanoribbons of different widths. Three types of junction geometries are considered. The junction conductance strongly depends on the atomic features of the junction geometry. When the shoulders of the junction have zigzag type edges, sharp conductance resonances usually appear in the low energy region around the Dirac point, and a conductance gap emerges. When the shoulders of the junction have armchair type edges, the conductance resonance behavior is weakened significantly, and the metal-metal-metal junction structures show semimetallic behaviors. The contact resistance also changes notably due to the various interface geometries of the junction.

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The cosmology and politics of YANZUN YILAOXUE

Cited by 2 publications

References 0 publications

Application of Disturbance Observer-Based Fast Terminal Sliding Mode Control for Asynchronous Motors in Remote Electrical Conductivity Control of Fertigation Systems

Application of Disturbance Observer-Based Fast Terminal Sliding Mode Control for Asynchronous Motors in Remote Electrical Conductivity Control of Fertigation Systems

Resonance Transport of Graphene Nanoribbon T-Shaped Junctions

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