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A Literature Review on Chewing Simulation and Wear Mechanisms of Dental Biomaterials

Journal of Bio- and Tribo-Corrosion 2021年第3期7卷 1-10页

作者： Yilmaz, Efe Çetin Sadeler, Recep Kilis 7 Aralık University Engineering and Architecture Faculty Department of Control Systems Electrical and Electronic Engineering Kilis Turkey Engineering Faculty Department of Mechanical Engineering Ataturk University Erzurum Turkey

The purpose of this review is to highlight some recent advances in our understanding of chewing simulation tests and wear mechanisms and how they contribute to material failures in the complex oral environment. Within in this study scope, as intraoral wear parameters;chewing force, tooth sliding distance, thermal change, food abrasiveness, saliva lubrication, and behavior of antagonist materials were investigated. In addition to the characteristics of chewing simulators that can simulate the intraoral tribological process in a laboratory environment have been investigated. It is a complex process to simulate the environment that a biomaterial placed in the human body is exposed to in a laboratory environment. Therefore, it is of great importance that the parameters applied in the wear test mechanisms carried out in the laboratory environment can simulate the behavior of living tissue. Additionally, both fatigue and abrasion loads of composite restorations can be important in achieving poor mechanical behavior, which is the leading cause of composite restoration failures. Overall, understanding the connectivity of all two procedures, while developing a mechanical definition of fatigue, wear mechanisms, are seen as key keys to successfully using in vitro studies to predict in vivo results and develop improved dental restorative materials. © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

关键词： Restoration

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COMPLEXITY ANALYSIS OF NETWORK-BASED DYNAMICAL systems

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Journal of systems Science & Complexity 2011年第3期24卷 413-432页

作者： Guofeng ZHANG Long WANG Tongwen CHEN School of Electronic Engineering University of Electronic Science and Technology of China Chengdu 610054 China. Intelligent Control Laboratory Center for Systems and Control College of Engineering Peking University Beijing 100871 China Department of Electrical and Computer Engineering University of Alberta Edmonton Alberta T6G 2V4 Canada

This paper investigates the nonlinear dynamics of network-based dynamical systems where network communication channels of finite data rates are inserted into the closed loops of the control systems. The authors analyze the bifurcation and chaotic behavior of the non-smooth dynamical systems. The authors first prove that for almost all system parameters there are no periodic orbits. This result distinguishes this type of non-smooth dynamical systems from many others exhibiting border-collision bifurcations. Next, the authors show analytically that the chaotic sets are separated from the region containing the line segment of all fixed points with a finite distance. Finally, the authors employ a simple model to highlight that both the number of clients sharing a common network channel and fluctuations in the available network bandwidth have significant influence on the performance of such dynamical systems.

关键词： Bifurcation feedback network-based dynamical system non-convexity periodicity.

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Recently developed approaches for solving blind deconvolution of MIMO-IIR systems: Super-exponential and eigenvector methods

Recently developed approaches for solving blind deconvolutio...

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IEEE International Symposium on Circuits and systems

作者： Kawamoto, Mitsuru Inouye, Yujiro Kohno, Kiyotaka National Institute of Advanced Industrial Science and Technology (AIST) Department of Electronic and Control Systems Engineering Shimane University Japan Department of Electronic Control Engineering Yonago National College of Technology Japan

ISBN: (纸本)9781424420780

Recently we develop two kinds of approaches, that is, the super-exponential method (SEM) and the eigenvector method (EVM), of which both can achieve the blind deconvolution for MIMO-IIR systems. It is shown that these methods are closely related each other. Based on this fact, we propose a new SEM incorporated with the EVM. Simulation results will be presented for showing the validity of the proposed method.

关键词： Eigenvalues and eigenfunctions

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On Passivity-Shortage of Human Operators for A Class of Semi-autonomous Robotic Swarms

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IFAC-PapersOnLine 2019年第34期51卷 21-27页

作者： Surya Atman, Made Widhi Noda, Kosei Funada, Riku Yamauchi, Junya Hatanaka, Takeshi Fujita, Masayuki Department of Systems and Control Engineering School of Engineering Tokyo Institute of Technology Tokyo Japan Division of Electrical Electronic and Information Engineering Graduate School of Engineering Osaka University Osaka Japan

This paper analyzes perceived workload and passivity-shortage of human operators for a class of semi-autonomous robotic swarms. First, we briefly introduce the passivity-short-based architecture presented in one of our previous works, which guarantees human-enabled motion synchronization to desired position/velocity references under the assumption that the human operator's thought process is a passivity-short system. It is observed that changes in parameter affects the visual feedback to the operator and also the complexity of the setups. Through user-studies using a human-in-the-loop simulator and questionnaires, we observe an increase in the perceived workload of the human operator for more complex setups. The result imposes the trade-off for less workload vs. clarity of the robotic swarms’ information to the human operator. Furthermore, through non-parametric system identification on data from user-studies, it is observed that all obtained models of the participants have the passivity-short property. © 2019

关键词： Visual servoing Economic and social effects Personnel Robotics Surveys Visual communication Autonomous robotics Co operative control Desired position Human in the loop Non parametric Robotic swarms Thought process Visual feedback

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Closed-loop identification of a first-order plus time delay model using Lambert W function 17

Closed-loop identification of a first-order plus time delay ...

引用

17th IEEE International Symposium on Intelligent systems and Informatics, SISY 2019

作者： Gerov, Radmila Jovanovic, Zoran University of Nis Faculty of Electronic Engineering Department of Control Systems Nis Serbia

ISBN: (纸本)9781728121420

The paper considers the estimation of all parameters of a first-order plus time delay system model. A new analytic method of parameter identification was introduced. Parameter estimation is based on the data received from the closed-loop step response using proportional controller. With the usage of Lambert W function for the chosen proportional gain as well as the received gain of the first-order plus time delay model, the time constant and the time delay are received by solving the transcendental characteristic system equation. The results were compared to the results of the other methods from literature. © 2019 IEEE.

关键词： Parameter estimation

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Fuzzy sliding mode control for anti-lock braking systems

Fuzzy sliding mode control for anti-lock braking systems

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7th IEEE International Symposium on Applied Computational Intelligence and Informatics, SACI 2012

作者： Mitić, Darko Antić, Dragan Perić, Staniša Milojković, Marko Nikolić, Saša University of Niš Faculty of Electronic Engineering Department of Control Systems Niš Serbia

ISBN: (纸本)9781467310116

A combination of two control methods, sliding mode and fuzzy, for the wheel slip control in anti-lock braking system, is presented in this paper. The fuzzy block is used to determine the values of key parameters important for establishing switching function dynamics. It is demonstrated, via performed experiments, that proposed control algorithm gives good system performances. ©2012 IEEE.

关键词： Anti-lock braking systems

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Fault Localisation in Infinite-Dimensional Linear Electrical Networks

arXiv

引用

arXiv 2025年

作者： Selvaratnam, Daniel Moreschini, Alessio Das, Amritam Parisini, Thomas Sandberg, Henrik Division of Decision and Control Systems KTH Royal Institute of Technology StockholmSE-100 44 Sweden Department of Electrical and Electronic Engineering Imperial College London LondonSW72AZ United Kingdom Department of Electronic Systems Aalborg University Denmark Department of Engineering and Architecture University of Trieste Italy Department of Electrical Engineering Eindhoven University of Technology P.O. Box 513 Eindhoven5600 MB Netherlands

We present a novel fault localisation methodology for linear time-invariant electrical networks with infinite-dimensional edge dynamics and uncertain fault dynamics. The theory accommodates instability and also bounded propagation delays in the network. The goal is to estimate the location of a fault along a given network edge, using sensors positioned arbitrarily throughout the network. Passive faults of unknown impedance are considered, along with stable faults of known impedance. To illustrate the approach, we tackle a significant use-case: a multi-conductor transmission line, with dynamics modelled by the Telegrapher’s equation, subject to a line-to-ground fault. Frequency-domain insights are used to reformulate the general fault localisation problem into a non-convex scalar optimisation problem, of which the true fault location is guaranteed to be a global minimiser. Numerical experiments are run to quantify localisation performance over a range of fault resistances. © 2025, CC BY-NC-ND.

关键词： Electric network parameters

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Frequency-Domain Bounds for the Multiconductor Telegrapher’s Equation

arXiv

引用

arXiv 2025年

We establish mathematical bounds on the chain, ABCD and immittance matrices of a multiconductor transmission line, based on the Telegrapher’s equation. Closed-form expressions for those matrices are also presented. Existing results that hold on the imaginary axis are extended to the complex plane, without reliance on a simultaneous diagonalizability assumption that is ubiquitous in the literature. Therefore, the results remain valid even when line symmetry breaks down, as in the case of electrical faults. The system-theoretic properties established here are of general relevance to control, power systems, and signal processing involving multiconductor transmission lines. © 2025, CC BY-NC-ND.

关键词： Transmission line theory

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Optimizing control of Wave Energy Converter with Losses and Fatigue in Power Take off

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IFAC-PapersOnLine 2017年第1期50卷 14680-14685页

作者： Nielsen, Kirsten M. Pedersen, Tom S. Andersen, Palle Ambühl, Simon Department of Electronic Systems Automation and Control Aalborg University AalborgDK-9220 Denmark Department of Civil Engineering Aalborg University AalborgDK-9220 Denmark

In this work we formulate a control strategy for the control of a Wave Energy Converter (WEC) aiming to maximize power take off taking into account losses in the conversion from mechanical to electrical power. The analysis is based on a point absorber. Maximizing electrical power however results in large variations in the forces or torques in the structure implying large fatigue burden giving reduced life time or requirements for increased dimensions of the structure; therefore there is a tradeoff between harvested energy and demands to the construction. We suggest analysis of this involving a Model Predictive control (MPC) strategy. Fatigue is usually assessed using the method of rainflow counting and Miner's rule. This model is difficult to include in an MPC formulation, instead we chose to give torque in the shaft of the power take off a quadratic weight in the performance function and evaluate the fatigue from simulated results. The optimization of power take off relies on a model of losses in the power conversion. For the control we apply an approximated friction model. Simulations are performed using time-series of wave forms representing sea states typical for the intended location of the WEC. A Pareto front illustrates obtained mean power versus necessary dimensions due to fatigue. The results are compared with standard resistive and reactive controllers. The results show that the MPC produces more than 25 % more harvested energy than the reactive control for the same requirements for the dimensions. © 2017

关键词： Wave energy conversion

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Gait evaluation of overground walking and treadmill walking using compass-type walking model

IEEJ Transactions on Electronics, Information and Systems

引用

IEEJ Transactions on electronics, Information and systems 2009年第7期129卷 1212-1219+6页

作者： Nagata, Yousuke Yamamoto, Masayoshi Funabiki, Shigeyuki Department of Electronic and Control Systems Engineering Interdisciplinary Faculty of Science and Engineering Shimane University 1060 Nishikawatsu-cho Matsue-shi Shimane 690-8504 Japan

A treadmill is a useful apparatus for the gait training and evaluation. However, many differences are reported between treadmill and overground walking. Experimental comparisons of the muscle activity of the leg and the heart rate have been carried out. However, the dynamic comparison has not been performed. The dynamic evaluation of the overground walking and the treadmill walking using a compass-type walking model (CTWM) which is a simple bipedal walking model, then their comparison is discussed. It is confirmed that the walking simulation using the CTWM can simulate the difference of that walk it is clarified that there are the differences of the kick impulse on the ground and the turning impulse of the foot to the variation of the belt speed and then differences are the main factor of two walking. © 2009 The Institute of Electrical Engineers of Japan.

关键词： Sporting goods

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