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An International Journal of Optimization and Control: Theories & Applications (IJOCTA)最新文献

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Dislocation hyperbolic augmented Lagrangian algorithm in convex programming 凸编程中的错位双曲增强拉格朗日算法
Lennin Mallma Ramirez, Nelson Maculan, Adilson Elias Xavier, Vinicius Layter Xavier
The dislocation hyperbolic augmented Lagrangian algorithm (DHALA) is a new approach to the hyperbolic augmented Lagrangian algorithm (HALA). DHALA is designed to solve convex nonlinear programming problems. We guarantee that the sequence generated by DHALA converges towards a Karush-Kuhn-Tucker point. We are going to observe that DHALA has a slight computational advantage in solving the problems over HALA. Finally, we will computationally illustrate our theoretical results.
错位双曲增强拉格朗日算法(DHALA)是双曲增强拉格朗日算法(HALA)的一种新方法。DHALA 专为解决凸非线性编程问题而设计。我们保证 DHALA 生成的序列收敛于 Karush-Kuhn-Tucker 点。我们将观察到,与 HALA 相比,DHALA 在求解问题时略有计算优势。最后,我们将通过计算来说明我们的理论结果。
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引用次数: 0
A Fractional-order mathematical model to analyze the stability and develop a sterilization strategy for the habitat of stray dogs 分析流浪狗栖息地稳定性并制定绝育策略的分数阶数学模型
Zafer Öztürk, Ali Yousef, Halis Bilgil, Sezer Sorgun
Today, the socio-cultural lack of some countries with increased urbanization has led to the unconscious breeding of stray dogs. The failure to care for the offspring of possessive dogs or ignoring the responsibility to find a suitable family for the offspring increased the dog population on the streets and in the shelters. In this study, our main target is to analyze the habitat of stray dogs and the strategy of how to control the population without damaging the ecosystem of the species. For this aim, we establish a fractional-order differential equation system to investigate the fractal dimension with long-term memory that invovles two compartments; the non-sterilized dog population (x(t)) and the sterilized one (y(t)). Firstly, we analyze the stability of the equilibrium points using the Routh-Hurwitz criteria to discuss cases that should not affect the ecosystem of the dog population, but control the stray dog population in the habitat. Since the intervention to the stray dog population occurs at discrete time impulses, we use the Euler method's discretization process to analyse the local and global stability around the equilibrium points. Besides this, we show that the solutions of the system represent semi-cycle behaviors. At the end of the study, we use accurate data to demonstrate the sterilization rate of stray dogs in their habitat.
如今,随着城市化进程的加快,一些国家社会文化的缺失导致了流浪狗的无意识繁殖。不照顾占有欲强的狗的后代或忽视为后代寻找合适家庭的责任,增加了街头和收容所中的狗的数量。在这项研究中,我们的主要目标是分析流浪狗的栖息地,以及如何在不破坏物种生态系统的情况下控制流浪狗数量的策略。为此,我们建立了一个分数阶微分方程系统来研究具有长期记忆的分形维度,该系统包含两个部分:未绝育的狗群(x(t))和已绝育的狗群(y(t))。首先,我们利用 Routh-Hurwitz 准则分析了平衡点的稳定性,讨论了不应影响狗群生态系统,而应控制栖息地中流浪狗数量的情况。由于对流浪狗群的干预发生在离散的时间脉冲上,我们使用欧拉法的离散化过程来分析平衡点周围的局部和全局稳定性。此外,我们还证明该系统的解代表了半周期行为。在研究的最后,我们用精确的数据证明了流浪狗在其栖息地的绝育率。
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引用次数: 0
Rotor design optimization of a 4000 rpm permanent magnet synchronous generator using moth flame optimization algorithm 利用蛾焰优化算法优化 4000 转/分永磁同步发电机的转子设计
Deniz Perin, A. D. Karaoglan, K. Yilmaz
The goal of this paper is to optimize the rotor design parameters of 4000 rpm permanent magnet synchronous generator. The factors namely embrace, offset, outer diameter, and magnet thickness are selected as the design parameters those will be optimized in order to hold the magnetic flux density (MFD) distribution and the flux density on stator teeth and stator yoke within a desirable range while maximizing efficiency. The numerical simulations are carried out in the Maxwell environment for this purpose. The mathematical relationships between the responses and the factors are then derived using regression modeling over the simulation data. Following the modeling phase, the moth flame optimization is applied to these regression models to optimize the rotor design parameters. The motivation is determining mathematical relation between the important design parameters of the high speed generator and the measured responses, when standard M530-50A lamination material is used and then to demonstrate the utility of MFO to the readers on this design problem. The optimum factor levels for embrace, offset, outer diameter, and magnet thickness are calculated as 0.68, 30, 161.56, and 8.92 respectively. Additionally, confirmations are done by using Maxwell and the efficiency is calculated as 94.85%, and magnetic distributions are calculated as 1.64, 0.26, and 0.93 Tesla for stator teeth flux density, stator yoke flux density, and MFD; respectively. The results show that the efficiency is maximized and the magnetic distributions are kept within an appropriate range.
本文旨在优化 4000 rpm 永磁同步发电机的转子设计参数。为了将磁通密度(MFD)分布以及定子齿和定子轭上的磁通密度保持在理想范围内,同时最大限度地提高效率,本文选择了怀抱、偏移、外径和磁体厚度等因素作为需要优化的设计参数。为此,我们在麦克斯韦环境中进行了数值模拟。然后,通过对模拟数据进行回归建模,得出响应和因素之间的数学关系。在建模阶段之后,对这些回归模型采用蛾焰优化法来优化转子设计参数。这样做的目的是在使用标准 M530-50A 层压材料时,确定高速发电机重要设计参数与测量响应之间的数学关系,然后向读者展示 MFO 在这一设计问题上的实用性。计算得出的抱负、偏移、外径和磁体厚度的最佳系数水平分别为 0.68、30、161.56 和 8.92。此外,还使用麦克斯韦进行了确认,计算得出效率为 94.85%,定子齿磁通密度、定子轭磁通密度和 MFD 的磁分布分别为 1.64、0.26 和 0.93 特斯拉。结果表明,效率最大化,磁分布保持在适当范围内。
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引用次数: 0
Proposing a novel mathematical model for hospital pneumatic system 提出医院气动系统的新型数学模型
Büşra Takgil, R. Kara
Hospital Pneumatic Systems, specializing in pneumatic systems, are among the most essential components for hospitals. It offers efficient and cost-effective solutions to problems related to the transportation of various materials in hospitals. However, in existing systems, the need for compressed air is met without worrying about cost control and without depending on the sample transported, and this not only makes the system inefficient but also may cause sample degradation. The main purpose of this study is to provide speed/pressure control according to the type of material transported to eliminate the disadvantages of existing systems such as energy use and sample degradation. In this study, a new mathematical model is presented that can be used to make more energy-efficient hospital pneumatic systems. Although there are many studies on various pneumatic systems in the literature, there is not enough for the control of hospital pneumatic systems. According to the results obtained in this study, the system parameters were determined and the mathematical model of the system was obtained by using the Multivariate nonlinear regression method. A genetic algorithm was used to test the validity of the obtained mathematical model and to optimize the coefficient of the input parameters of the model. It is expected that this proposed model will contribute to the use of hospital pneumatic systems and provide a scientific and practical solution to the proposed mathematical model. The proposed mathematical model provides up to %43 more efficient transportation over the currently used system that has been tested.
医院气动系统专业生产气动系统,是医院最基本的组件之一。它为医院内各种材料的运输问题提供了高效、经济的解决方案。然而,在现有的系统中,满足压缩空气的需求无需考虑成本控制,也不取决于运送的样本,这不仅使系统效率低下,还可能导致样本质量下降。本研究的主要目的是根据输送材料的类型提供速度/压力控制,以消除现有系统的缺点,如能源消耗和样品降解。本研究提出了一个新的数学模型,可用于制造更节能的医院气动系统。虽然文献中有很多关于各种气动系统的研究,但对医院气动系统控制的研究还不够。根据本研究获得的结果,确定了系统参数,并利用多元非线性回归法获得了系统的数学模型。利用遗传算法检验了所获数学模型的有效性,并优化了模型输入参数的系数。预计所提出的模型将有助于医院气动系统的使用,并为所提出的数学模型提供科学实用的解决方案。与目前使用的系统相比,所提出的数学模型的运输效率最高可提高 43%。
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引用次数: 0
Some results regarding observability and initial state reconstruction for time-fractional systems 关于时间分数系统的可观测性和初始状态重构的一些结果
Hamza Ben Brahim, F. E. El Alaoui, Khalid Zguaid
The aim of this study is to present the notion of observability for a specific class of linear time-fractional systems of Riemann-Liouville type with a differentiation order between 1 and 2. To accomplish this goal, we first define the concept of observability and its features, then we extend the Hilbert Uniqueness Method (HUM) to determine the system's initial state. This method converts the reconstruction problem into a solvability one, leading to an algorithm that calculates the initial state. The effectiveness of the proposed algorithm is demonstrated through numerical simulations, which are presented in the final section.
本研究的目的是为一类微分阶数介于 1 和 2 之间的黎曼-刘维尔型线性时分数系统提出可观测性概念。为了实现这一目标,我们首先定义了可观测性的概念及其特征,然后扩展了希尔伯特唯一性方法(HUM)以确定系统的初始状态。该方法将重构问题转化为可解性问题,从而产生了一种计算初始状态的算法。最后一节将通过数值模拟演示所提算法的有效性。
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引用次数: 0
New generalized integral transform via Dzherbashian--Nersesian fractional operator 通过 Dzherbashian--Nersesian 分数算子的新广义积分变换
Rachid Belgacem, Ahmed Bokhari, D. Baleanu, S. Djilali
In this paper, we derive a new generalized integral transform on Dzherbashian–Nersesian fractional operator and give some special cases. We make a generalization of the application of integral transformations to different fractional operators, where several previous results can be invoked from a single relation. We also use the new results obtained to solve some fractional differential equations involving the recent revival of Dzherbashian-Nersesian fractional operators.
在本文中,我们推导了一种新的关于 Dzherbashian-Nersesian 分数算子的广义积分变换,并给出了一些特例。我们对积分变换在不同分数算子上的应用进行了概括,即可以从一个关系中引用多个先前的结果。我们还利用获得的新结果求解了一些涉及最近复兴的 Dzherbashian-Nersesian 分数算子的分数微分方程。
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引用次数: 0
Examination and experimental comparison of dc/dc buck converter topologies used in wireless electric vehicle charging applications 对无线电动汽车充电应用中使用的直流/直流降压转换器拓扑结构进行研究和实验比较
Hakan Akca, Ahmet Aktas
The studies on Wireless Power Transfer (WPT) technology and peripherals in Electric Vehicle (EV) applications are intensifying. While the energy received from the WPT system is transferred to the EV battery, the direct current (dc)/dc converter circuits are used. The dc/dc buck converter topologies are one of them. The converter circuits must be highly efficient, lightweight, and compact to have a high range in EV vehicles. There are asynchronous buck, synchronous buck, and interleaved synchronous buck converter circuit topologies from the literature. In this study, the efficiency results of these circuit topologies were analyzed using MATLAB/Simulink and experimental studies. This study contributes to the literature by conducting circuit-level efficiency analysis and component-level power loss analysis. It has been observed that the interleaved synchronous buck converter circuit operates at 99% efficiency at 1066 W. In addition, it has been shared with the oscilloscope results that the current ripples of this circuit topology are lower than other circuit converters. Specifically, there has been a significant reduction of 56% in power losses, particularly in the interleaved synchronous buck converter (ISBC). This study analyzes the dynamic behavior of the dc/dc buck converter topologies, and results about their performance are given.
有关电动汽车(EV)应用中的无线电力传输(WPT)技术和外围设备的研究正在不断深入。当从 WPT 系统接收的能量被传输到电动汽车电池时,需要使用直流(dc)/直流转换器电路。直流/直流降压转换器拓扑结构就是其中之一。转换器电路必须高效、轻巧、紧凑,才能在电动汽车中实现较高的续航能力。文献中有异步降压、同步降压和交错同步降压转换器电路拓扑。本研究使用 MATLAB/Simulink 和实验研究分析了这些电路拓扑的效率结果。本研究通过进行电路级效率分析和元件级功率损耗分析,为文献做出了贡献。此外,示波器结果表明,该电路拓扑的电流纹波低于其他电路转换器。尤其是交错同步降压转换器(ISBC)的功率损耗显著降低了 56%。本研究分析了直流/直流降压转换器拓扑的动态行为,并给出了有关其性能的结果。
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引用次数: 0
Numerical solution of coupled system of Emden-Fowler equations using artificial neural network technique 利用人工神经网络技术数值求解埃姆登-福勒方程耦合系统
Ashish Kumar, Manoj Kumar, Parany Goswami
In this paper, a deep artificial neural network technique is proposed to solve the coupled system of Emden-Fowler equations. A vectorized form of algorithm is developed. Implementation and simulation of this technique is performed using Python code. This technique is implemented in various numerical examples, and simulations are conducted. We have shown graphically how accurately this method works. We have shown the comparison of numerical solution and exact solution using error tables. We have also conducted a comparative analysis of our solution with alternative methods, including the Bernstein collocation method and the Homotopy analysis method. The comparative results are presented in error tables. The efficiency and accuracy of this method are demonstrated by these graphs and tables.
本文提出了一种深度人工神经网络技术,用于求解埃姆登-福勒方程耦合系统。开发了一种矢量化的算法形式。使用 Python 代码对该技术进行了实现和模拟。我们在各种数值示例中实现了这一技术,并进行了仿真。我们用图表展示了这种方法的精确性。我们使用误差表对数值解和精确解进行了比较。我们还对我们的解法与其他方法进行了比较分析,包括伯恩斯坦配位法和同调分析法。比较结果以误差表的形式呈现。这些图和表证明了这种方法的效率和准确性。
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引用次数: 0
An approximate solution of singularly perturbed problem on uniform mesh 均匀网格上奇异扰动问题的近似解法
D. Arslan, Ercan Çelik
In this study, we obtain approximate solution for singularly perturbed problem of differential equation having two integral boundary conditions. With this purpose, we propose a new finite difference scheme. First, we construct this exponentially difference scheme on a uniform mesh using the finite difference method. We use the quasilinearization method and the interpolating quadrature formulas to establish the numerical scheme. Then, as a result of the error analysis, we show that the method under study is convergent in the first order. Consequently, theoretical findings are supported by numerical results obtained with an example. Approximate solutions curves are compared on the chart to provide concrete indication. The maximum errors and convergence rates obtained are given on the table for different varepsilon  and N values.
在本研究中,我们获得了具有两个积分边界条件的微分方程奇异扰动问题的近似解。为此,我们提出了一种新的有限差分方案。首先,我们使用有限差分法在均匀网格上构建了这种指数差分方案。我们使用准线性化方法和插值正交公式来建立数值方案。然后,通过误差分析,我们证明了所研究的方法是一阶收敛的。因此,理论结论得到了实例数值结果的支持。近似解曲线在图表上进行了比较,以提供具体的说明。表中给出了不同 varepsilon 和 N 值下的最大误差和收敛率。
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引用次数: 0
Controllability of nonlinear fractional integrodifferential systems involving multiple delays in control 涉及多重延迟控制的非线性分数整微分系统的可控性
Abdul Haq, N. Sukavanam
This work studies the existence of solutions and approximate controllability of fractional integrodifferential systems with Riemann-Liouville derivatives and with multiple delays in control. We establish suitable assumptions to prove the existence of solutions. Controllability of the system is shown by assuming a range condition on control operators and Lipschitz condition on non-linear functions. We use the concepts of strongly continuous semigroup rather than resolvent operators. Finally, an example is give to illustrate the theory.
这项工作研究的是具有黎曼-刘维尔导数和多重延迟控制的分数整微分系统的解的存在性和近似可控性。我们建立了适当的假设来证明解的存在性。通过假设控制算子的范围条件和非线性函数的 Lipschitz 条件,证明了系统的可控性。我们使用强连续半群的概念,而不是解析算子。最后,我们举例说明了这一理论。
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引用次数: 0
期刊
An International Journal of Optimization and Control: Theories & Applications (IJOCTA)
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