Dynamics最新文献_第2页

System Identification Using Self-Adaptive Filtering Applied to Second-Order Gradient Materials 将自适应滤波技术应用于二阶梯度材料的系统识别技术

Dynamics Pub Date : 2024-04-07 DOI: 10.3390/dynamics4020015

T. Kletschkowski

{"title":"System Identification Using Self-Adaptive Filtering Applied to Second-Order Gradient Materials","authors":"T. Kletschkowski","doi":"10.3390/dynamics4020015","DOIUrl":"https://doi.org/10.3390/dynamics4020015","url":null,"abstract":"For many engineering applications, it is sufficient to use the concept of simple materials. However, higher gradients of the kinematic variables are taken into account to model materials with internal length scales as well as to describe localization effects using gradient theories in finite plasticity or fluid mechanics. In many approaches, length scale parameters have been introduced that are related to a specific micro structure. An alternative approach is possible, if a thermodynamically consistent framework is used for material modeling, as shown in the present contribution. However, even if sophisticated and thermodynamically consistent material models can be established, there are still not yet standard experiments to determine higher order material constants. In order to contribute to this ongoing discussion, system identification based on the method of self-adaptive filtering is proposed in this paper. To evaluate the effectiveness of this approach, it has been applied to second-order gradient materials considering longitudinal vibrations. Based on thermodynamically consistent models that have been solved numerically, it has been possible to prove that system identification based on self-adaptive filtering can be used effectively for both narrow-band and broadband signals in the field of second-order gradient materials. It has also been found that the differences identified for simple materials and gradient materials allow for condition monitoring and detection of gradient effects in the material behavior.","PeriodicalId":507568,"journal":{"name":"Dynamics","volume":"21 20","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140732531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamics and Stability of Double-Walled Carbon Nanotube Cantilevers Conveying Fluid in an Elastic Medium 在弹性介质中输送流体的双壁碳纳米管悬臂的动力学和稳定性

Dynamics Pub Date : 2024-03-27 DOI: 10.3390/dynamics4020013

V. Vassilev, G. Valchev

引用次数: 0

Exploiting Domain Partition in Response Function-Based Dynamic Surrogate Modeling: A Continuous Crystallizer Study 在基于响应函数的动态代理建模中利用领域划分：连续结晶器研究

Dynamics Pub Date : 2024-03-26 DOI: 10.3390/dynamics4020012

A. Di Pretoro, L. Montastruc, Stéphane Negny

{"title":"Exploiting Domain Partition in Response Function-Based Dynamic Surrogate Modeling: A Continuous Crystallizer Study","authors":"A. Di Pretoro, L. Montastruc, Stéphane Negny","doi":"10.3390/dynamics4020012","DOIUrl":"https://doi.org/10.3390/dynamics4020012","url":null,"abstract":"Given the exponential rise in the amount of data requiring processing in all engineering fields, phenomenological models have become computationally cumbersome. For this reason, more efficient data-driven models have been recently used with the purpose of substantially reducing simulation computational times. However, especially in process engineering, the majority of the proposed surrogate models address steady-state problems, while poor studies refer to dynamic simulation modeling. For this reason, using a response function-based approach, a crystallization unit case study was set up in order to derive a dynamic data-driven model for crystal growth whose characteristic differential parameters are derived via Response Surface Methodology. In particular, multiple independent variables were considered, and a well-established sampling technique was exploited for sample generation. Then, different sample sizes were tested and compared in terms of accuracy indicators. Finally, the domain partition strategy was exploited in order to show its relevant impact on the final model accuracy. In conclusion, the outcome of this study proved that the proposed procedure is a suitable methodology for dynamic system metamodeling, as it shows good compliance and relevant improvement in terms of computational time. In terms of future research perspectives, testing the proposed procedure on different systems and in other research fields would allow for greater improvement and would, eventually, extend its validity.","PeriodicalId":507568,"journal":{"name":"Dynamics","volume":"83 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140377711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Iterated Crank–Nicolson Method for Peridynamic Models 用于周向动力学模型的迭代曲柄-尼科尔森法

Dynamics Pub Date : 2024-03-15 DOI: 10.3390/dynamics4010011

Jinjie Liu, Samuel Appiah-Adjei, M. Brio

{"title":"Iterated Crank–Nicolson Method for Peridynamic Models","authors":"Jinjie Liu, Samuel Appiah-Adjei, M. Brio","doi":"10.3390/dynamics4010011","DOIUrl":"https://doi.org/10.3390/dynamics4010011","url":null,"abstract":"In this paper, we explore the iterated Crank–Nicolson (ICN) algorithm for the one-dimensional peridynamic model. The peridynamic equation of motion is an integro-differential equation that governs structural deformations such as fractures. The ICN method was originally developed for hyperbolic advection equations. In peridynamics, we apply the ICN algorithm for temporal discretization and the midpoint quadrature method for spatial integration. Several numerical tests are carried out to evaluate the performance of the ICN method. In general, the ICN method demonstrates second-order accuracy, consistent with the Störmer–Verlet (SV) method. When the weight is 1/3, the ICN method behaves as a third-order Runge–Kutta method and maintains strong stability-preserving (SSP) properties for linear problems. Regarding energy conservation, the ICN algorithm maintains at least second-order accuracy, making it superior to the SV method, which converges linearly. Furthermore, selecting a weight of 0.25 results in fourth-order superconvergent energy variation for the ICN method. In this case, the ICN method exhibits energy variation similar to that of the fourth-order Runge–Kutta method but operates approximately 20% faster. Higher-order convergence for energy can also be achieved by increasing the number of iterations in the ICN method.","PeriodicalId":507568,"journal":{"name":"Dynamics","volume":"4 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140241287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Phase Diagram of Nuclear Pastas in Neutron Star Crusts 中子星外壳中的核糊状物相图

Dynamics Pub Date : 2024-02-22 DOI: 10.3390/dynamics4010009

Jorge A. Muñoz, Jorge A. López

引用次数: 0

Development and Validation of a Compressible Reacting Gas-Dynamic Flow Solver for Supersonic Combustion 开发和验证用于超音速燃烧的可压缩反应气体动力流求解器

Dynamics Pub Date : 2024-02-11 DOI: 10.3390/dynamics4010008

Anvar Gilmanov, P. Gokulakrishnan, M. Klassen

{"title":"Development and Validation of a Compressible Reacting Gas-Dynamic Flow Solver for Supersonic Combustion","authors":"Anvar Gilmanov, P. Gokulakrishnan, M. Klassen","doi":"10.3390/dynamics4010008","DOIUrl":"https://doi.org/10.3390/dynamics4010008","url":null,"abstract":"An approach based on the OpenFOAM library has been developed to solve a high-speed, multicomponent mixture of a reacting, compressible flow. This work presents comprehensive validation of the newly developed solver, called compressibleCentralReactingFoam, with different supersonic flows, including shocks, expansion waves, and turbulence–combustion interaction. The comparisons of the simulation results with experimental and computational data confirm the fidelity of this solver for problems involving multicomponent high-speed reactive flows. The gas dynamics of turbulence–chemistry interaction are modeled using a partially stirred reactor formulation and provide promising results to better understand the complex physics involved in supersonic combustors. A time-scale analysis based on local Damköhler numbers reveals different regimes of turbulent combustion. In the core of the jet flow, the Damköhler number is relatively high, indicating that the reaction time scale is smaller than the turbulent mixing time scale. This means that the combustion is controlled by turbulent mixing. In the shear layer, where the heat release rate and the scalar dissipation rate have the highest value, the flame is stabilized due to finite rate chemistry with small Damköhler numbers and a limited fraction of fine structure. This solver allows three-dimensional gas dynamic simulation of high-speed multicomponent reactive flows relevant to practical combustion applications.","PeriodicalId":507568,"journal":{"name":"Dynamics","volume":"31 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139845294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development and Validation of a Compressible Reacting Gas-Dynamic Flow Solver for Supersonic Combustion 开发和验证用于超音速燃烧的可压缩反应气体动力流求解器

Dynamics Pub Date : 2024-02-11 DOI: 10.3390/dynamics4010008

Anvar Gilmanov, P. Gokulakrishnan, M. Klassen

{"title":"Development and Validation of a Compressible Reacting Gas-Dynamic Flow Solver for Supersonic Combustion","authors":"Anvar Gilmanov, P. Gokulakrishnan, M. Klassen","doi":"10.3390/dynamics4010008","DOIUrl":"https://doi.org/10.3390/dynamics4010008","url":null,"abstract":"An approach based on the OpenFOAM library has been developed to solve a high-speed, multicomponent mixture of a reacting, compressible flow. This work presents comprehensive validation of the newly developed solver, called compressibleCentralReactingFoam, with different supersonic flows, including shocks, expansion waves, and turbulence–combustion interaction. The comparisons of the simulation results with experimental and computational data confirm the fidelity of this solver for problems involving multicomponent high-speed reactive flows. The gas dynamics of turbulence–chemistry interaction are modeled using a partially stirred reactor formulation and provide promising results to better understand the complex physics involved in supersonic combustors. A time-scale analysis based on local Damköhler numbers reveals different regimes of turbulent combustion. In the core of the jet flow, the Damköhler number is relatively high, indicating that the reaction time scale is smaller than the turbulent mixing time scale. This means that the combustion is controlled by turbulent mixing. In the shear layer, where the heat release rate and the scalar dissipation rate have the highest value, the flame is stabilized due to finite rate chemistry with small Damköhler numbers and a limited fraction of fine structure. This solver allows three-dimensional gas dynamic simulation of high-speed multicomponent reactive flows relevant to practical combustion applications.","PeriodicalId":507568,"journal":{"name":"Dynamics","volume":"123 45","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139785599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of Wind Turbine Wake Dynamics by a Gaussian-Core Vortex Lattice Technique 利用高斯核心涡流晶格技术分析风力涡轮机的风浪动力学特性

Dynamics Pub Date : 2024-02-01 DOI: 10.3390/dynamics4010006

Apurva Baruah, Fernando Ponta

{"title":"Analysis of Wind Turbine Wake Dynamics by a Gaussian-Core Vortex Lattice Technique","authors":"Apurva Baruah, Fernando Ponta","doi":"10.3390/dynamics4010006","DOIUrl":"https://doi.org/10.3390/dynamics4010006","url":null,"abstract":"The development and deployment of the next generation of wind energy systems calls for simulation tools that model the entire wind farm while balancing accuracy and computational cost. A full-system wind farm simulation must consider the atmospheric inflow, the wakes and consequent response of the multiple turbines, and the implementation of the appropriate farm-collective control strategies that optimize the entire wind farm’s output. In this article, we present a novel vortex lattice model that enables the effective representation of the complex vortex wake dynamics of the turbines in a farm subject to transient inflow conditions. This work extends the capabilities of our multi-physics suite, CODEF, to include the capability to simulate the wakes and the high-fidelity aeroelastic response of multiple turbines in a wind farm. Herein, we compare the results of our GVLM technique with the LiDAR measurements obtained at Sandia National Laboratories’ SWiFT facility. The comparison shows remarkable similarities between the simulation and field measurements of the wake velocity. These similarities demonstrate our model’s capabilities in capturing the entire wake of a wind turbine at a significantly reduced computational cost as compared to other techniques.","PeriodicalId":507568,"journal":{"name":"Dynamics","volume":"57 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139882069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of Wind Turbine Wake Dynamics by a Gaussian-Core Vortex Lattice Technique 利用高斯核心涡流晶格技术分析风力涡轮机的风浪动力学特性

Dynamics Pub Date : 2024-02-01 DOI: 10.3390/dynamics4010006

Apurva Baruah, Fernando Ponta

{"title":"Analysis of Wind Turbine Wake Dynamics by a Gaussian-Core Vortex Lattice Technique","authors":"Apurva Baruah, Fernando Ponta","doi":"10.3390/dynamics4010006","DOIUrl":"https://doi.org/10.3390/dynamics4010006","url":null,"abstract":"The development and deployment of the next generation of wind energy systems calls for simulation tools that model the entire wind farm while balancing accuracy and computational cost. A full-system wind farm simulation must consider the atmospheric inflow, the wakes and consequent response of the multiple turbines, and the implementation of the appropriate farm-collective control strategies that optimize the entire wind farm’s output. In this article, we present a novel vortex lattice model that enables the effective representation of the complex vortex wake dynamics of the turbines in a farm subject to transient inflow conditions. This work extends the capabilities of our multi-physics suite, CODEF, to include the capability to simulate the wakes and the high-fidelity aeroelastic response of multiple turbines in a wind farm. Herein, we compare the results of our GVLM technique with the LiDAR measurements obtained at Sandia National Laboratories’ SWiFT facility. The comparison shows remarkable similarities between the simulation and field measurements of the wake velocity. These similarities demonstrate our model’s capabilities in capturing the entire wake of a wind turbine at a significantly reduced computational cost as compared to other techniques.","PeriodicalId":507568,"journal":{"name":"Dynamics","volume":"29 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139822160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

New Types of Derivative Non-linear Schrödinger Equations Related to Kac–Moody Algebra A2(1) 与 Kac-Moody 代数 A2(1) 有关的新型衍生非线性薛定谔方程

Dynamics Pub Date : 2024-01-18 DOI: 10.3390/dynamics4010005

A. A. Stefanov

引用次数: 0