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Optimal actuator placement for control of vibrations induced by pedestrian-bridge interactions 控制行人-桥梁相互作用引起的振动的最佳驱动器位置
Q4 MATHEMATICS, APPLIED Pub Date : 2023-08-20 DOI: 10.5206/mase/15949
Martin Arop, H. Kasumba, Juma Kasozi, F. Berntsson
In this paper, an optimal actuator placement problem, with a linear wave equation as the constraint, is considered. In particular, this work presents the framework for finding the best location of actuators depending upon the given initial conditions, and where the dependence on the initial conditions is averaged out. The problem is motivated by the need to control vibrations induced by pedestrian-bridge interactions. An approach based on the shape optimization techniques is used to solve the problem. Specifically, the shape sensitivities involving a cost functional are determined using the averaged adjoint approach. A numerical algorithm based on these sensitivities is used as a solution strategy. Numerical tests illustrate the theoretical results.
本文研究了以线性波动方程为约束的最优作动器布置问题。特别是,这项工作提出了根据给定初始条件找到执行器最佳位置的框架,并且对初始条件的依赖被平均掉。这个问题的动机是需要控制行人与桥梁相互作用引起的振动。采用基于形状优化技术的方法来解决这一问题。具体而言,使用平均伴随方法确定涉及成本函数的形状灵敏度。采用基于这些灵敏度的数值算法作为求解策略。数值试验验证了理论结果。
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引用次数: 0
Analysis of thermal stresses to 2D plane thermoelastic inhomogeneous strip 二维平面热弹性非均匀带材的热应力分析
Q4 MATHEMATICS, APPLIED Pub Date : 2023-06-26 DOI: 10.5206/mase/16387
Abhijeet B. Adhe, K. Ghadle, U. Thool
This paper deals with study of the plane elasticity of thermoelastic problems for inhomogenous strip. Here, the original problems are reduced to set the governing equations in the volterra integral equations by making the use of direct integration method. Further using the iteration technique the numerical calculations has been performed. The stress distribution obtained and calculated numerically and shown graphically.
本文研究了非均匀带热弹性问题的平面弹性。本文利用直接积分法将原来的问题简化为volterra积分方程中的控制方程组。进一步使用迭代技术进行了数值计算。数值计算得到的应力分布,并以图形显示。
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引用次数: 0
On the weak solution of the Von Karman model with thermoelastic plates 热弹性板Von Karman模型的弱解
Q4 MATHEMATICS, APPLIED Pub Date : 2023-06-09 DOI: 10.5206/mase/15658
M. Raissouli, J. Oudaani
The aim of this article is to study the dynamic Von-Karman model coupledwith thermoelastic equations without rotational terms, subject to a thermal dissipation. We establish the existence as well as the uniqueness of a weak solution related to the dynamic model. At the end, we apply the finite difference method for approximating the solution of our problem.
本文的目的是研究动力学冯-卡门模型与无旋转项的热弹性方程耦合,考虑热耗散。我们建立了与动态模型相关的一个弱解的存在性和唯一性。最后,应用有限差分法逼近问题的解。
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引用次数: 0
CONCEPTUAL MODEL OF MIXED-INTEGER LINEAR PROGRAMMING WATER DISTRIBUTION SYSTEM 混合整数线性规划配水系统概念模型
Q4 MATHEMATICS, APPLIED Pub Date : 2023-05-22 DOI: 10.5206/mase/15591
Habiba Babangida Awwalu, N. Abdullahi, M. Hussaini
Water is a basic part of our daily lives, as such effective water supply is of paramount importance. Thus, as a result of the rise in population size and water shortage there is the need for proper, suitable and optimal utilization of water resources to efficiently be distributed among the populace. The proper allocation and distribution of water in the field of network planning need to be modelled through mathematical parameters for objective of water distribution system. This mathematical approach requires of solving an optimization problem based on multi-objective function subjected to certain constraints of mixed integer linear programming objective function which is proportional to the cost of the water distribution network. This study present a conceptual model of multi-objective optimization proposed for determination of design parameters of water distribution system by considering the significant number of constraints, decision variables, cost and reliability objective functions. The model was proposed to solve the reliability problem of water production and reduce the design and operational costs.
水是我们日常生活的基本组成部分,因此有效的供水至关重要。因此,由于人口规模的增加和水的短缺,需要适当、适当和最佳地利用水资源,以便在人口中有效地分配。在管网规划领域,用水的合理分配需要通过配水系统目标的数学参数进行建模。这种数学方法要求在混合整数线性规划目标函数与配水管网成本成正比的一定约束下,求解一个基于多目标函数的优化问题。本文提出了考虑大量约束条件、决策变量、成本和可靠性目标函数的配水系统设计参数确定的多目标优化概念模型。该模型的提出是为了解决出水可靠性问题,降低设计和运行成本。
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引用次数: 1
Dynamical study of the theta-logistic predator-prey model incorporating gregarious behavior of prey 考虑捕食群体行为的θ逻辑捕食-被捕食模型的动力学研究
Q4 MATHEMATICS, APPLIED Pub Date : 2023-05-01 DOI: 10.5206/mase/15648
P. Santra, G. Mahapatra
Relation between species and their livelihood environment in ecological systems is very complex. For that reason, in order to study predator-prey  relations, modeling is essential in biomathematics. The vital components of predator-prey models are prey species' growth function in the absence of apredator and the functional response. In this article, we proposed a predator-prey model with gregarious prey. In the existing literature, square-root functional response incorporates the gregarious behavior of prey. This study considers the generalized square root functional response and theta-logistic growth of prey in the absence of a predator. The effect of functional response parameters on stability, limit cycle, and Hopf bifurcation on the proposed model has been discussed. Numerical analysis is performed on the basis of some hypothetical parameter values to analyze the model numerically.
生态系统中物种与其生存环境的关系十分复杂。因此,为了研究捕食者-猎物关系,建模在生物数学中是必不可少的。捕食者-猎物模型的重要组成部分是在没有捕食者的情况下被捕食物种的生长功能和功能反应。在本文中,我们提出了一个具有群居性猎物的捕食者-猎物模型。在现有文献中,平方根功能反应包含了猎物的群居行为。本研究考虑了在没有捕食者的情况下,猎物的广义平方根功能反应和theta-logistic增长。讨论了函数响应参数对模型稳定性、极限环和Hopf分岔的影响。在一些假设参数值的基础上进行数值分析,对模型进行数值分析。
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引用次数: 0
Diffusion-driven instability and pattern formation in a prey-predator model with fear and Allee effect 具有恐惧和Allee效应的捕食模型中扩散驱动的不稳定性和模式形成
Q4 MATHEMATICS, APPLIED Pub Date : 2023-04-02 DOI: 10.5206/mase/15231
Debjit Pal, D. Kesh, D. Mukherjee
This paper analyses a predator-prey model with Holling type II response function incorporating Allee and fear effect in the prey. The model includes intra species competition among predators. We find out the local dynamics as well as Hopf bifurcation by considering level of fear as bifurcation parameter. The condition for diffusion-driven instability and patterns are then demonstrated in relation to the system's ecological parameters and diffusion coefficients. Intra-specific competition affects the dynamics of the system and Turing pattern formation. Moreover, output of results is verified through numerical simulation. Thus, from a dynamical standpoint, the considered model seems to be relevant in the field of ecology.
本文分析了一个具有HollingⅡ型反应函数的捕食-被捕食模型,该模型考虑了Allee和恐惧效应。该模型包括捕食者之间的物种内竞争。通过将恐惧水平作为分岔参数,我们得到了局部动力学和Hopf分岔。然后,根据系统的生态参数和扩散系数,证明了扩散驱动的不稳定性和模式的条件。特定内部竞争影响系统的动态性和图灵模式的形成。此外,通过数值模拟验证了结果的输出。因此,从动力学的角度来看,所考虑的模型似乎与生态学领域有关。
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引用次数: 0
Energy criteria of global existence for a class of Hartree equations with Coulomb potential 一类具有库仑势的Hartree方程全局存在的能量准则
Q4 MATHEMATICS, APPLIED Pub Date : 2023-03-30 DOI: 10.5206/mase/15536
Na Tang, Jian Zhang
This paper studies a class of Hartree equations with Coulomb potential. Combined with the conservation of mass and energy, we analyze the variational characteristics of the corresponding nonlinear elliptic equation. According to the range of parameters, we construct the evolution invariant flows of the equation in different cases. Then the sharp energy thresholds for global existence and blow-up of solutions are discussed in detail.
本文研究了一类具有库仑势的Hartree方程。结合质量守恒和能量守恒,分析了相应的非线性椭圆型方程的变分特性。根据参数的取值范围,构造了不同情况下方程的演化不变流。然后详细讨论了解的全局存在和爆破的尖锐能量阈值。
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引用次数: 0
Minimum Dominating Set for the Prism Graph Family 棱镜图族的最小支配集
Q4 MATHEMATICS, APPLIED Pub Date : 2023-03-22 DOI: 10.5206/mase/15775
Veninstine Vivik J
The dominating set of the graph G is a subset D of vertex set V, such that every vertex not in V-D is adjacent to at least one vertex in the vertex subset D. A dominating set D is a minimal dominating set if no proper subset of D is a dominating set. The number of elements in such set is called as domination number of graph and is denoted by $gamma(G)$. In this work the domination numbers are obtained for family of prism graphs such as prism CL_n, antiprism Q_n and crossed prism R_n by identifying one of their minimum dominating set.
图G的支配集是顶点集V的子集D,使得不在V-D中的每个顶点都与顶点子集D中的至少一个顶点相邻。如果D的固有子集不为支配集,则支配集D是最小支配集。这个集合中元素的个数称为图的支配数,用$gamma(G)$表示。本文通过识别棱镜CL_n、反棱镜Q_n和交叉棱镜R_n的最小控制集,得到了棱镜图族的控制数。
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引用次数: 0
Chaotic dynamics of the fractional order Schnakenberg model and its control 分数阶Schnakenberg模型的混沌动力学及其控制
Q4 MATHEMATICS, APPLIED Pub Date : 2023-03-22 DOI: 10.5206/mase/15355
Md. Jasim Uddin, S. M. Sohel Rana
The Schnakenberg model is thought to be the Caputo fractional derivative. In order to create caputo fractional differential equations for the Schnakenberg model, a discretization process is first used. The fixed points in the model are categorized topologically. Then, we show analytically that, under certain parametric conditions, a Neimark-Sacker (NS) bifurcation and a Flip-bifurcation are supported by a fractional order Schnakenberg model. Using central manifold and bifurcation theory, we demonstrate the presence and direction of NS and Flip bifurcations. The parameter values and the initial conditions have been found to have a profound impact on the dynamical behavior of the fractional order Schnakenberg model. Numerical simulations are shown to demonstrate chaotic behaviors like bifurcations, phase portraits, period 2, 4, 7, 8, 10, 16, 20 and 40 orbits, invariant closed cycles, and attractive chaotic sets in addition to validating analytical conclusions.  In order to support the system’s chaotic characteristics, we also compute the maximal Lyapunov exponents and fractal dimensions quantitatively. Finally, the chaotic trajectory of the system is stopped using the OGY approach, hybrid control method, and state feedback method.
Schnakenberg模型被认为是Caputo分数导数。为了为Schnakenberg模型创建caputo分数阶微分方程,首先使用了离散化过程。模型中的不动点按拓扑进行分类。然后,我们分析地证明,在一定的参数条件下,分数阶Schnakenberg模型支持Neimark-Sacker(NS)分岔和Flip分岔。利用中心流形和分岔理论,我们证明了NS和Flip分岔的存在性和方向性。参数值和初始条件对分数阶Schnakenberg模型的动力学行为有着深远的影响。数值模拟表明,除了验证分析结论外,还展示了混沌行为,如分叉、相位肖像、周期2、4、7、8、10、16、20和40轨道、不变闭环和有吸引力的混沌集。为了支持系统的混沌特性,我们还定量计算了最大李雅普诺夫指数和分形维数。最后,采用OGY方法、混合控制方法和状态反馈方法对系统的混沌轨迹进行了抑制。
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引用次数: 1
On a new generalized Tsallis relative operator entropy 关于一个新的广义Tsallis相对算子熵
Q4 MATHEMATICS, APPLIED Pub Date : 2023-02-20 DOI: 10.5206/mase/15397
Lahcen Tarik, Mohamed Chergui, Bouazza El Wahbi
In this paper, we present a generalization of Tsallis relative operator entropy defined for positive operators and we investigate some related properties. Some inequalities involving the generalized Tsallis relative operator entropy are pointed out as well.
本文给出了为正算子定义的Tsallis相对算子熵的一个推广,并研究了一些相关性质。同时也指出了广义Tsallis相对算子熵的一些不等式。
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Mathematics in applied sciences and engineering
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