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Small jet engine reservoir computing digital twin 小型喷气发动机蓄水池计算数字孪生
Pub Date : 2023-12-15 DOI: arxiv-2312.09978
C. J. Wright, N. Biederman, B. Gyovai, D. J. Gauthier, J. P. Wilhelm
Machine learning was applied to create a digital twin of a numericalsimulation of a single-scroll jet engine. A similar model based on the insightsgained from this numerical study was used to create a digital twin of a JetCatP100-RX jet engine using only experimental data. Engine data was collected froma custom sensor system measuring parameters such as thrust, exhaust gastemperature, shaft speed, weather conditions, etc. Data was gathered while theengine was placed under different test conditions by controlling shaft speed.The machine learning model was generated (trained) using a next-generationreservoir computer, a best-in-class machine learning algorithm for dynamicalsystems. Once the model was trained, it was used to predict behavior it hadnever seen with an accuracy of better than 1.8% when compared to the testingdata.
应用机器学习创建了单涡流喷气发动机数值模拟的数字孪生模型。基于该数值模拟研究获得的洞察力的类似模型被用于创建仅使用实验数据的 JetCatP100-RX 喷射发动机的数字孪生模型。发动机数据由一个定制的传感器系统收集,该系统测量推力、排气温度、轴转速、天气条件等参数。通过控制轴速,将发动机置于不同的测试条件下收集数据。机器学习模型是使用下一代存储计算机生成(训练)的,该计算机是用于动态系统的一流机器学习算法。模型训练完成后,就可以用来预测从未见过的行为,与测试数据相比,准确率优于 1.8%。
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引用次数: 0
A solvable two-dimensional swarmalator mode 可求解的二维蜂群模式
Pub Date : 2023-12-15 DOI: arxiv-2312.10178
Kevin O'Keeffe, Gourab Kumar Sar, Md Sayeed Anwar, Joao U. F. Lizárraga, Marcus A. M. de Aguiar, Dibakar Ghosh
Swarmalators are oscillators that swarm through space as they synchronize intime. Introduced a few years ago to model many systems which mix synchrony withself-assembly, they remain poorly understood theoretically. Here we obtain thefirst analytic results on swarmalators moving in two-dimensional (2D) plane byenforcing periodic boundary conditions; this simpler topology allowsexpressions for order parameters, stabilities, and bifurcations to be derivedexactly. We suggest some future directions for swarmalator research and pointout some connections to the Kuramoto model and the Vicsek model from activematter; these are intended as a call-to-arms for the sync community and otherresearchers looking for new problems and puzzles to work on.
蜂群器是一种振荡器,它们在时间上同步时会在空间中蜂拥而至。几年前,蜂群振荡器被引入到许多混合同步与自组装的系统建模中,但人们对它们的理论了解仍然很少。在这里,我们通过强化周期性边界条件,首次获得了关于在二维(2D)平面上运动的蜂群的解析结果;这种更简单的拓扑结构允许精确推导出阶参数、稳定性和分岔的表达式。我们提出了一些蜂群器研究的未来方向,并指出了与仓本模型和活性物质 Vicsek 模型的一些联系;这些都是为了呼吁同步界和其他研究人员寻找新的问题和谜题。
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引用次数: 0
How Social Rewiring Preferences Bridge Polarized Communities 社会重塑偏好如何弥合两极分化的社区
Pub Date : 2023-12-13 DOI: arxiv-2312.08088
Henrique M. Borges, Víıtor V. Vasconcelos, Flávio L. Pinheiro
Recently, social debates have been marked by increased polarization of socialgroups. Such polarization not only implies that groups cannot reach a consensuson fundamental questions but also materializes in more modular socialspaces/networks that further amplify the risks of polarization in lesspolarizing topics. How can network adaptation bridge different communities whenindividuals reveal homophilic or heterophilic social rewiring preferences?Here, we consider information diffusion processes that capture a continuum fromsimple to complex contagion processes. We use a computational model tounderstand how fast and to what extent individual rewiring preferences bridgeinitially weakly connected communities and how likely it is for them to reach aconsensus. We show that homophilic and heterophilic rewiring have differentimpacts depending on the type of opinion spread. First, in the case of complexopinion diffusion, we show that even polarized social networks can reach apopulation-wide consensus without reshaping their underlying network. Whenpolarized social structures amplify opinion polarization, heterophilic rewiringpreferences play a key role in creating bridges between communities andfacilitating a population-wide consensus. Secondly, in the case of simpleopinion diffusion, homophilic rewiring preferences are more capable offostering consensus and avoiding a co-existence (dynamical polarization) ofopinions. Hence, across a broad profile of simple and complex opinion diffusionprocesses, only a mix of heterophilic and homophilic rewiring preferencesavoids polarization and promotes consensus.
最近,社会辩论的特点是社会群体的两极分化加剧。这种两极分化不仅意味着群体无法就基本问题达成共识,而且还体现在更模块化的社会空间/网络中,这进一步放大了在两极分化较少的话题中出现两极分化的风险。当个体表现出同性恋或异性恋的社会重新布线偏好时,网络适应如何在不同的社区之间架起桥梁?在这里,我们考虑信息扩散过程,捕捉从简单到复杂的传染过程的连续体。我们使用一个计算模型来了解个人重新布线偏好在多大程度上以多快的速度连接最初连接较弱的社区,以及他们达成共识的可能性有多大。我们表明,根据观点传播的类型,同性恋和异性恋的重新布线有不同的影响。首先,在复杂意见扩散的情况下,我们表明即使两极分化的社会网络也可以在不重塑其底层网络的情况下达成全民共识。当两极分化的社会结构放大了意见的两极分化时,异性恋偏好在建立社区之间的桥梁和促进全民共识方面发挥了关键作用。其次,在简单意见扩散的情况下,同质性的重新布线偏好更能促进共识,避免意见的共存(动态极化)。因此,在广泛的简单和复杂的意见扩散过程中,只有异性恋和亲同性的重新布线偏好的混合才能避免两极分化并促进共识。
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引用次数: 0
Swarmalators on a ring with uncorrelated pinning 环上的蜂群器与不相关的针刺
Pub Date : 2023-12-12 DOI: arxiv-2312.07014
Gourab Kumar Sar, Kevin O'Keeffe, Dibakar Ghosh
We present a case study of swarmalators (mobile oscillators) which move on a1D ring and are subject to pinning. Previous work considered the special casewhere the pinning in space and the pinning in the phase dimension werecorrelated. Here we study the general case where the space and phase pinningare uncorrelated, both being chosen uniformly at random. This induces severalnew effects, such as pinned async, mixed states, and a first order phasetransition. These phenomena may be found in real world swarmalators such assystems of vinegar eels, Janus matchsticks, electrorotated Quincke rollers orJapanese tree frogs.
我们提出了一个在一维环上移动并受到钉住的移动振荡器(移动振荡器)的案例研究。以前的工作考虑了空间钉钉和相尺寸钉钉相互关联的特殊情况。这里我们研究了空间和相位固定不相关的一般情况,两者都是均匀随机选择的。这就产生了一些新的效果,比如固定异步、混合状态和一阶相变。这些现象可以在现实世界的小型动物中找到,比如醋鳗系统、雅努斯火柴棒系统、旋转的昆克滚筒系统或日本树蛙系统。
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引用次数: 0
Multifractal nonlinearity as a robust estimator of multiplicative cascade dynamics 多分形非线性作为乘法级联动态的稳健估算器
Pub Date : 2023-12-09 DOI: arxiv-2312.05653
Madhur Mangalam, Aaron D Likens, Damian G Kelty-Stephen
Multifractal formalisms provide an apt framework to study random cascades inwhich multifractal spectrum width $Deltaalpha$ fluctuates depending on thenumber of estimable power-law relationships. Then again, multifractalitywithout surrogate comparison can be ambiguous: the original measurement series'multifractal spectrum width $Deltaalpha_mathrm{Orig}$ can be sensitive tothe series length, ergodicity-breaking linear temporal correlations (e.g.,fractional Gaussian noise, $fGn$), or additive cascade dynamics. To test thesethreats, we built a suite of random cascades that differ by the length, type ofnoise (i.e., additive white Gaussian noise, $awGn$, or $fGn$), and mixtures of$awGn$ or $fGn$ across generations (progressively more $awGn$, progressivelymore $fGn$, and a random sampling by generation), and operations applying noise(i.e., addition vs. multiplication). The so-called ``multifractalnonlinearity'' $t_mathrm{MF}$ (i.e., a $t$-statistic comparing$Deltaalpha_mathrm{Orig}$ and multifractal spectra width forphase-randomized linear surrogates $Deltaalpha_mathrm{Surr}$) is a robustindicator of random multiplicative rather than random additive cascadeprocesses irrespective of the series length or type of noise. $t_mathrm{MF}$is more sensitive to the number of generations than the series length.Furthermore, the random additive cascades exhibited much stronger ergodicitybreaking than all multiplicative analogs. Instead, ergodicity breaking inrandom multiplicative cascades more closely followed the ergodicity-breaking ofthe constituent noise types -- breaking ergodicity much less when arising fromergodic $awGn$ and more so for noise incorporating relatively more correlated$fGn$. Hence, $t_mathrm{MF}$ is a robust multifractal indicator ofmultiplicative cascade processes and not spuriously sensitive to ergodicitybreaking.
多分形形式主义为研究随机级联提供了一个合适的框架,在随机级联中,多分形谱宽 $Deltaalpha$ 的波动取决于可估算的幂律关系的数量。然而,没有替代比较的多分形可能是模糊的:原始测量序列的多分形谱宽 $Deltaalpha_mathrm{Orig}$ 可能对序列长度、破坏遍历性的线性时间相关性(如分数高斯噪声,$fGn$)或相加级联动力学很敏感。为了测试这些威胁,我们建立了一套随机级联,其长度、噪声类型(即加性白高斯噪声、$awGn$或$fGn$)、各代$awGn$或$fGn$的混合物(逐步增加$awGn$、逐步增加$fGn$以及各代随机抽样)以及应用噪声的操作(即加法与乘法)各不相同。所谓的 "多分形非线性"$t_mathrm{MF}$(即比较$Deltaalpha_mathrm{Orig}$和多分形谱宽的相随机线性代用$Deltaalpha_mathrm{Surr}$的$t$统计量)是随机乘法级联过程而非随机加法级联过程的稳健指标,与序列长度或噪声类型无关。此外,与所有乘法级联相比,随机加法级联表现出更强的遍历性破坏。相反,随机乘法级联的遍历性破缺更接近于组成噪声类型的遍历性破缺--当产生于ergodic$awGn$时,遍历性破缺要小得多,而对于包含相对更相关的$fGn$的噪声,遍历性破缺则更大。因此,$t_mathrm{MF}$是多分形级联过程的稳健指标,而不是对遍历性破坏的虚假敏感。
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引用次数: 0
Reviving Delayed Dynamics 恢复延迟动力
Pub Date : 2023-12-08 DOI: arxiv-2312.04848
Kenta Ohira, Toru Ohira
We introduce a delay differential equation that manifests a distinctivedynamical behavior. Specifically, the transient dynamics of this equationdemonstrate a unique ``reviving" amplitude phenomenon within certain ranges ofdelay values. In this intriguing phenomenon, the amplitude initially decreasestowards a fixed point until a specific time point, after which it ultimatelydiverges. Our analysis encompasses both analytical and numerical approaches,incorporating an approximation using the Lambert W function. The derivedapproximate solution effectively captures the qualitative aspects of thereviving dynamics across various delay values.
我们引入了一个延迟微分方程,它表现出一种独特的动力学行为。具体来说,该方程的瞬态动力学在一定的延迟值范围内表现出独特的 "复苏 "振幅现象。在这一引人入胜的现象中,振幅最初会向一个固定点下降,直到一个特定的时间点,之后振幅最终会发散。我们的分析包括分析和数值方法,并使用兰伯特 W 函数进行近似。推导出的近似解有效地捕捉到了不同延迟值下的生存动力学的定性方面。
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引用次数: 0
Minimal Model for Reservoir Computing 储层计算的最小模型
Pub Date : 2023-12-02 DOI: arxiv-2312.01089
Yuzuru Sato, Miki Kobayashi
A minimal model for reservoir computing is studied. We demonstrate that areservoir computing exists that emulates given coupled maps by constructing amodularised network. We describe a possible mechanism for collapses of theemulation in the reservoir computing. Such transitory behaviour is caused byeither (i) a finite-time stagnation near an unstable chaotic set, or (ii) acritical transition driven by the effective parameter drift. Our approachreveals the essential mechanism for reservoir computing and provides insightsinto the design of reservoir computing for practical applications.
研究了储层计算的最小模型。我们证明了通过构造模块化网络来模拟给定耦合映射的油藏计算是存在的。我们描述了油藏计算中模拟崩溃的一种可能机制。这种暂态行为是由(i)在不稳定混沌集附近的有限时间停滞或(ii)由有效参数漂移驱动的临界跃迁引起的。我们的方法揭示了储层计算的基本机制,并为实际应用的储层计算设计提供了见解。
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引用次数: 0
Synchronized oscillatory flows in two parallelly connected Starling resistors 同步振荡流在两个并联的斯特林电阻
Pub Date : 2023-11-29 DOI: arxiv-2311.17570
Yuki Araya, Hiroaki Ito, Hiroyuki Kitahata
We investigated the synchronization phenomena of the oscillatory flows in twoparallelly connected Starling resistors, which are an ideal model system of twocoupled collapsible tubes merging into a single tube downstream. The stablesynchronization modes depended on the distance between the deformable regionand the merging point; only an in-phase mode was stable for the large distance,in-phase and anti-phase modes were bistable for the middle distance, and againonly an in-phase mode was stable for the small distance. An anti-phase modebecame stable through the subcritical pitchfork bifurcation by decreasing thedistance. Further decreasing the distance, the anti-phase mode became unstablethrough the subcritical Neimark-Sacker bifurcation. We also clarified thedistance dependence of the amplitude and frequency for each stablesynchronization mode.
本文研究了两个平行连接的Starling电阻中振荡流的同步现象,这是一个理想的双耦合可折叠管下游合并成单管的模型系统。稳定同步模式取决于可变形区域与合并点之间的距离;在大距离范围内,只有同相模式是稳定的;在中距离范围内,只有同相模式和反相模式是双稳定的;在小距离范围内,只有同相模式是稳定的。反相模型通过亚临界干草叉分叉通过减小距离变得稳定。进一步减小距离,反相模式通过亚临界neimmark - sacker分岔变得不稳定。我们还澄清了每个稳定同步模式的振幅和频率的距离依赖关系。
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引用次数: 0
A categorical framework for quantifying emergent effects in network topology 一种量化网络拓扑中突现效应的分类框架
Pub Date : 2023-11-29 DOI: arxiv-2311.17403
Johnny Jingze Li, Sebastian Prado Guerra, Kalyan Basu, Gabriel Silva
Emergent effect is crucial to the understanding of properties of complexsystems that do not appear in their basic units, but there has been a lack oftheories to measure and understand its mechanisms. In this paper, weestablished a framework based on homological algebra that formulates emergenceas the mathematical structure of derived functors, and then applied it tonetwork models to develop a computational measure of emergence. This frameworkties the emergence of a system to its network topology and local structures,paving the way to predict and understand the cause of emergent effects. We showin our numerical result that our measure of emergence correlates with theexisting information-theoretic measure of emergence as information loss.
涌现效应对于理解不以其基本单位出现的复杂系统的性质至关重要,但一直缺乏测量和理解其机制的理论。在本文中,我们建立了一个基于同调代数的框架,将突现表示为派生函子的数学结构,然后将其应用于网络模型,以开发突现的计算度量。该框架将系统的出现与其网络拓扑和局部结构联系起来,为预测和理解突发效应的原因铺平了道路。我们的数值结果表明,我们的涌现度量与现有的作为信息损失的涌现的信息论度量相关联。
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引用次数: 0
Evolutionary game theory: the mathematics of evolution and collective behaviours 进化博弈论:进化和集体行为的数学
Pub Date : 2023-11-24 DOI: arxiv-2311.14480
The Anh Han
This brief discusses evolutionary game theory as a powerful and unifiedmathematical tool to study evolution of collective behaviours. It summarisessome of my recent research directions using evolutionary game theory methods,which include i) the analysis of statistical properties of the number of(stable) equilibria in a random evolutionary game, and ii) the modelling ofsafety behaviours' evolution and the risk posed by advanced ArtificialIntelligence technologies in a technology development race. Finally, itincludes an outlook and some suggestions for future researchers.
本文简要讨论了进化博弈论作为研究集体行为进化的一个强大而统一的数学工具。它总结了我最近使用进化博弈论方法的一些研究方向,其中包括i)随机进化博弈中(稳定)均衡数量的统计特性分析,以及ii)安全行为进化的建模以及技术发展竞赛中先进人工智能技术带来的风险。最后,对未来的研究进行了展望和建议。
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引用次数: 0
期刊
arXiv - PHYS - Adaptation and Self-Organizing Systems
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