Function Approximation Technique Based Adaptive Control for Chaos Synchronization between Different Systems with Unknown Dynamics

Wang, Yujie; Bai, Yuchuan

doi:10.1007/s12555-020-0412-y

Cited by 8 publications

(4 citation statements)

References 47 publications

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“…If function gðtÞ: satisfies Dirichlet conditions in the time interval ½t 1 ; t 2 : , then gðtÞ: can be denoted by the following equation [41]:…”

Section: Function Approximation Technique Using Fourier Seriesmentioning

confidence: 99%

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Adaptive Approximation Sliding-Mode Control of an Uncertain Continuum Robot with Input Nonlinearities and Disturbances

2024

Applied Bionics and Biomechanics

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This paper develops an adaptive nonsingular fast terminal sliding-mode control (ANFTSMC) scheme for the continuum robot subjected to uncertain dynamics, external disturbances, and input nonlinearities (e.g., actuator deadzones/faults). Concretely, a function approximation technique (FAT) is utilized to estimate unknown robot dynamics and actuator deadzones/faults online. Furthermore, a disturbance observer (DO) is devised to make up for unknown external disturbances. Then, an ANFTSMC scheme combined with FAT and DO is developed, to expedite the restoration of the stability for the continuum robot. The proposed ANFTSMC not only can retain the benefits of traditional terminal sliding-mode control (TSMC), containing easy enforcement, quick response, and robustness to uncertainties but also dispose of the latent singularity for traditional faster TSMC designs. Afterward, the simulation results show that the proposed controller can effectively improve the trajectory tracking accuracy of the continuum robot, and the tracking root-mean-square errors are 0.0115 and 0.0128 rad. Finally, the effectiveness of ANFTSMC scheme is validated by experiments.

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“…If function gðtÞ: satisfies Dirichlet conditions in the time interval ½t 1 ; t 2 : , then gðtÞ: can be denoted by the following equation [41]:…”

Section: Function Approximation Technique Using Fourier Seriesmentioning

confidence: 99%

“…Furthermore, in the light of FAT, the lumped unknown term γðx 1 ; x 2 ; uÞ: can be represented by the following equation [40,41]:…”

Section: Design Of Anftsmcmentioning

confidence: 99%

Adaptive Approximation Sliding-Mode Control of an Uncertain Continuum Robot with Input Nonlinearities and Disturbances

2024

Applied Bionics and Biomechanics

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“…The FAT is an effective tool to deal with control systems with time-varying nonlinear uncertainties [23]. For instance, if d(t) is an unknown time-varying function in a control system, one can utilize weighted basis functions to represent d(t), at each time instant, as [10], [23]- [28]…”

Section: B Fatmentioning

confidence: 99%

Adaptive Multi-Agent Control with Dynamic Obstacle Avoidance in a Limited Region

Bai

Wang

Xiong

et al. 2022

2022 American Control Conference (ACC)

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This paper presents a safe adaptive coverage controller for multi-agent systems with actuator faults and timevarying uncertainties. The centroidal Voronoi tessellation (CVT) is applied to generate an optimal configuration of multi-agent systems for covering an area of interest. As conventional CVT based controller cannot prevent collisions between agents with non-zero size, a control barrier function (CBF) based controller is developed to ensure collision avoidance with a function approximation technique (FAT) based design to deal with system uncertainties. The proposed controller is verified under simulations.

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“…In addition to the genotoxic and cellular damage, recent evidence suggest role of Cd in several epigenetic changes like DNA methylation, histone modifications, and alteration in microRNAs (miRNAs) expression which further disturbs the cellular process and homeostasis. [ 14 ] miRNAs are small, noncoding, single‐stranded endogenous RNA molecules that play a significant role in posttranscriptional regulation of gene expression by binding to a complementary sequence on the 3′UTR region of the target mRNA molecule leading to translational repression or degradation of the same. Altered expression of these miRNAs has been implicated in various pathophysiological conditions like inflammation, apoptosis, and autophagy resulting in various human diseases.…”

Section: Introductionmentioning

confidence: 99%

Plasma microRNA expression and immunoregulatory cytokines in an Indian population occupationally exposed to cadmium

Mitra

Goyal

Sharma

et al. 2022

J Biochem & Molecular Tox

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Following its accumulation in the body, cadmium (Cd) exposure is associated with devastating effects on multiple organ system of the human body. The immune system is one of the sensitive targets for Cd‐induced toxicity. Recently, studies have demonstrated a significant role of Cd in inducing epigenetic alterations. With this background, the present study was planned to study the changes in candidate microRNA (miRNA) expression associated with immune regulation in occupationally Cd‐exposed workers. One hundred individuals involved in welding and metal handicraft manufacturing, while 80 apparently healthy subjects without any prior history of occupational exposure were recruited for the study. Blood Cd level was determined by atomic absorption spectrometry. Serum cytokine levels were measured using an enzyme‐linked immunosorbent assay and serum miRNA expression of candidate miRNAs (miR‐146a, miR‐210, and miR‐222) were determined by real‐time polymerase chain reaction. The median Cd level (2.40 μg/L) in the occupationally exposed workers was significantly higher than the nonexposed subjects (0.90 μg/L). Among the cytokines, interleukin‐4 (IL‐4), and tumor necrosis factor‐alpha (TNF‐α) were significantly higher while IL‐2 and IL‐10 were significantly lower in the exposed. The expression level of miR‐146a and miR‐222 were significantly different between the groups with the former showing downregulation and later showing upregulation. Correlation analysis revealed a positive and negative association of miR‐222 and miR‐146a with blood cadmium level, IL‐17 as well as TNF‐α, respectively. Furthermore, the in‐silico analysis revealed a significant role of the studied miRNAs in various cellular and genetic pathways. The findings of the present study demonstrate significant involvement of Cd‐induced alteration in miRNAs in varied immune regulatory changes in exposed individuals.

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Function Approximation Technique Based Adaptive Control for Chaos Synchronization between Different Systems with Unknown Dynamics

Cited by 8 publications

References 47 publications

Adaptive Approximation Sliding-Mode Control of an Uncertain Continuum Robot with Input Nonlinearities and Disturbances

Adaptive Approximation Sliding-Mode Control of an Uncertain Continuum Robot with Input Nonlinearities and Disturbances

Adaptive Multi-Agent Control with Dynamic Obstacle Avoidance in a Limited Region

Plasma microRNA expression and immunoregulatory cytokines in an Indian population occupationally exposed to cadmium

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