Applied Mathematical Modelling最新文献

{"title":"Dynamic analysis of 2D micromorphic hyperelastic continua considering finite deformation: A novel numerical approach","authors":"R. Hassani,&nbsp;R. Ansari,&nbsp;A. Basti","doi":"10.1016/j.apm.2025.115941","DOIUrl":"10.1016/j.apm.2025.115941","url":null,"abstract":"<div><div>In this paper, a numerical method named as variational differential quadrature-finite element method (VDQ-FEM) is proposed to study the dynamic response of hyperelastic structures with finite deformation in the context of 2D micromorphic theory. Continuum micromorphic hyperelasticity relations are first written in a novel vector-matrix form, which are then discretized using the method of VDQ-FEM. In the next step, the resulting relations are discretized on time domain using Newmark's method in order to study the time response. The presented matricized formulation can be exploited in the coding procedure of numerical techniques. Moreover, VDQ-FEM is capable of addressing problems with irregular domains. Simple implementation, absence of locking problem, fast convergence rate and computational efficiency are the main benefits of proposed numerical approach. Three test problems are solved to show the accuracy and efficiency of developed numerical approach. It is revealed that VDQ-FEM in conjunction with Newmark's method is capable of predicting the dynamic response of micromorphic hyperelastic continua with large deformations in an efficient way. The influences of internal length parameter, density and micro-inertia on the responses of considered micromorphic hyperelastic structures are also analyzed.</div></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":"143 ","pages":"Article 115941"},"PeriodicalIF":4.4,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New analytical solutions for stress and displacement in deeply buried noncircular tunnels incorporating the influence of seepage flow","authors":"E.T. Wang ,&nbsp;H.N. Wang ,&nbsp;X.C. Jia","doi":"10.1016/j.apm.2025.115990","DOIUrl":"10.1016/j.apm.2025.115990","url":null,"abstract":"<div><div>High water pressure is a common condition during the construction and operation of deeply buried tunnels, which is a significant factor in the stability analysis of underground structures. In this study, the complex variable theory is extended to analytically solve the hydro-mechanical coupled problems for tunnelling problems, which is the first time that fully considers the seepage field influence on the mechanical field, any tunnel shape and the actual steady-state pore pressure distribution. The detailed formulations of the extended complex variable theory are provided, by which specific analytical solutions are proposed for stress, displacement and pore pressure around tunnels with arbitrary shapes. The theory extension and solutions are verified by the good agreement between the analytical results and numerical predictions.</div><div>Based on an investigation of the mechanical mechanism using analytical solutions, it is found that the influence of the seepage field on the mechanical field can be divided into two parts, including the surface loading effect and the flow effect. The surface loading effect is more significant than the flow effect. We also investigate the influence of key parameters on stress and tunnel convergence, such as Biot coefficient and tunnel shape, providing normalized charts as a reference for engineering applications. The developed hydro-mechanical coupled solutions can be used for both external and internal high-pressure conditions. Furthermore, it is a tool with a high potential for application to several relevant case studies, such as nuclear waste disposals.</div></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":"142 ","pages":"Article 115990"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stabilization of nonlinear systems with guaranteed performance: A Lyapunov-based prescribed-time approach","authors":"Liang Zhang ,&nbsp;Kangwei Zhao ,&nbsp;Jie Yan ,&nbsp;An-Min Zou","doi":"10.1016/j.apm.2025.115991","DOIUrl":"10.1016/j.apm.2025.115991","url":null,"abstract":"<div><div>This paper studies a Lyapunov characterization for prescribed-time stability, a novel set of prescribed performance functions, and investigates their applications in stabilizing a class of nonlinear systems. First, a general prescribed-time sliding mode controller is constructed to guarantee the strict regulation of error variables within prescribed boundaries. Then, the stability of the resultant closed-loop system is verified by Lyapunov stability theorems. The presented results constitute a framework for the examination of prescribed-time stability, designing finite-time performance functions, and developing prescribed-time control algorithms. The effectiveness of the proposed methods is demonstrated through numerical simulations and the hardware-in-loop experiment.</div></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":"144 ","pages":"Article 115991"},"PeriodicalIF":4.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adjoint-based optimization for non-linear inverse problems with high-order discretization of the compressible RANS equations","authors":"Bartolomeo Fanizza ,&nbsp;Pedro Stefanin Volpiani ,&nbsp;Florent Renac ,&nbsp;Emeric Martin ,&nbsp;Denis Sipp","doi":"10.1016/j.apm.2025.115984","DOIUrl":"10.1016/j.apm.2025.115984","url":null,"abstract":"<div><div>This work presents an adjoint-based strategy to solve non-linear inverse problems discretized with high-order numerical methods. The inverse problem is defined here based on the optimization of a control parameter to minimize a cost-functional subject to the compressible RANS equations discretized with the modal discontinuous Galerkin (DG) method. The distributed control parameter is searched in the DG function space and the discrete adjoint approach, consistent with the formal problem, is used to compute the derivative of the cost function in the optimization process. The linearization of the cost-functional and of the governing equations, the expression of the gradient, as well as the numerical strategy to efficiently solve the adjoint system with flexible inner-outer GMRES solvers have been detailed. In the case of a strongly under-determined problem, regularization techniques based on the penalization of the norm of the control parameter have been introduced. The methodology is illustrated on the case of a data-assimilation (DA) problem, which aims at minimizing the discrepancy of (sparse) high-fidelity measurements with the solution of the RANS equations corrected by four different control parameters. The optimization strategy is tested progressively with measurements on the full computational domain (abundant measurements) and solid wall boundaries (sparse measurements). First, a laminar flow around a cylinder is used to validate the inverse problem resolution with a DG discretization of different approximation orders. Subsequently, results regarding a turbulent flow around a square cylinder allow to compare the optimization convergence of each corrective parameters with abundant measurements. Finally, a shock-wave/turbulent boundary-layer interaction configuration is considered. Great correction of the velocity field is obtained with one of the proposed corrective term. In the case of abundant measurements it is also possible to get accurate correction of wall variables such as the skin-friction and pressure coefficient. Regularization of the optimal space, in case of sparse measurements, is attempt through penalization techniques.</div></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":"142 ","pages":"Article 115984"},"PeriodicalIF":4.4,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143174391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Oxygen-assisted cracking behavior model based on phase-field fracture framework","authors":"Xin Huang ,&nbsp;Qikun Xie ,&nbsp;Shaolin Li ,&nbsp;Hongyu Qi ,&nbsp;Xiaoguang Yang ,&nbsp;Duoqi Shi","doi":"10.1016/j.apm.2025.115988","DOIUrl":"10.1016/j.apm.2025.115988","url":null,"abstract":"<div><div>Oxidation can have a major effect on the crack growth behavior of components working at high temperatures. However, phase-field (PF) fracture models considering oxidation are lacking. This study proposes a PF framework specifically designed for oxygen-assisted cracking. The model builds on the dynamic embrittlement behavior caused by oxygen, and an oxygen-related fracture-toughness degradation function is established. Then, this model is extended to fatigue, creep, and creep-fatigue cracks by employing the corresponding PF model. The model is validated using several examples. Specifically, (i) fatigue cracks for compact tension specimens, (ii) creep cracks for compact tension specimens, and (iii) creep-fatigue cracks for compact tension and shear specimens are simulated. The simulation results are consistent with the experimental results, proving the predictive ability of the proposed framework.</div></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":"143 ","pages":"Article 115988"},"PeriodicalIF":4.4,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A semi-analytical dosimetry model for inspiratory flow of reactive gases in the lung","authors":"Pouria Motevalian,&nbsp;María Antonieta Sánchez-Farrán,&nbsp;James S. Ultman,&nbsp;Ali Borhan","doi":"10.1016/j.apm.2025.115989","DOIUrl":"10.1016/j.apm.2025.115989","url":null,"abstract":"<div><div>A semi-analytical dosimetry model for steady flow and mass transfer in cylindrical tubes is developed for reactive gas transport and uptake in proximal airways of the lung during quasi-steady inspiratory flow. The model is used to predict the longitudinal concentration distribution of inhaled ozone along selected airway pathways in the lung of a two-month-old rhesus monkey. Two ideal airway structures are considered; a symmetrically-branched model based on computer tomography (CT) scan measurements and an asymmetric one informed by airway measurements from magnetic resonance imaging (MRI) data. The model is validated by comparison with predictions of computational fluid dynamics (CFD) simulations of ozone transport and uptake in an anatomically-accurate airway structure reconstructed from MRI data. The relative error between the CFD results and model predictions for the asymmetrically-branched airway structure is less than 1.5% along all airway paths, rendering the dosimetry model a computationally efficient tool for capturing longitudinal variations of reactive species concentration within the lung airways.</div></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":"142 ","pages":"Article 115989"},"PeriodicalIF":4.4,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143295944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"LS-SVM-based nonlinear multi-physical steady-state field coupled problems computing method","authors":"Xiaoming Han ,&nbsp;Xin Zhao ,&nbsp;Zhengwei Qu ,&nbsp;Yecheng Wu ,&nbsp;Guofeng Li","doi":"10.1016/j.apm.2025.115987","DOIUrl":"10.1016/j.apm.2025.115987","url":null,"abstract":"<div><div>Multi-physical steady-state field coupled problems are addressed using mesh-based methods, including finite element and finite volume methods, along with their enhancements. To streamline computational complexity, this paper employs a least squares support vector machine (LS-SVM) for tackling the multi-physical steady-state field coupled problems. First, LS-SVM lowers computational complexity by eliminating mesh dependency. Second, it effectively solves multi-physical steady-state field coupled problems with high adaptability. Finally, it can restrain the complex boundary conditions. This paper validates the approach with two case studies: a one-dimensional nonlinear electro-mechanical coupled problem and a two-dimensional nonlinear thermoelectric coupled problem. The LS-SVM method achieved calculation accuracy comparable to the finite element method while offering greater precision and faster computation than both the radial basis function (RBF) interpolation and physics-informed neural network (PINN) methods.</div></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":"142 ","pages":"Article 115987"},"PeriodicalIF":4.4,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143353520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantification of uncertainty information in remaining useful life estimation","authors":"Changdong Zhao ,&nbsp;Shihu Xiang ,&nbsp;Songhua Hao ,&nbsp;Feng Niu ,&nbsp;Kui Li","doi":"10.1016/j.apm.2025.115992","DOIUrl":"10.1016/j.apm.2025.115992","url":null,"abstract":"<div><div>Accurate remaining useful life prediction is crucial for prognostics and health management of products. Model uncertainty is an important factor negatively affecting prediction performance. Existing methods fail to evaluate the predictive ability of a degradation model without the actual remaining useful life, and typically require adequate degradation data or prior information. They may be unable to ensure a reliable prediction performance in practical engineering scenarios with limited degradation data and mechanism knowledge. To address these issues, a model fusion based method is proposed using the uncertainty theory. Specifically, a comprehensive model performance evaluation method is proposed by simultaneously considering complexity, fitting ability, and predictive ability. The evolution process of the comprehensive model performance index is modelled by proposing a generalized arithmetic Liu process model that can flexibly depict characteristics of an uncertain process. A model fusion method is proposed by quantifying the similarity between a candidate model and the actual degradation process based on the predictive evolution analysis of the performance index. Then, a random initial solutions based algorithm is proposed to estimate remaining useful life from the fused model. Finally, three real cases and a numerical case are utilized to demonstrate the effectiveness and versatility of the proposed method by comparing it with existing methods.</div></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":"142 ","pages":"Article 115992"},"PeriodicalIF":4.4,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling of temperature dependent graded vibration in a piezoelectric microbeam composite plates with a sliding contact","authors":"Mohd Sadab,&nbsp;Santimoy Kundu","doi":"10.1016/j.apm.2025.115983","DOIUrl":"10.1016/j.apm.2025.115983","url":null,"abstract":"<div><div>The present study introduces a novel framework for analyzing shear wave propagation in piezoelectric microbeam-dielectric elastic composite plates, emphasizing the temperature-dependent graded factors that influence key material properties. Unlike previous works, which often assume constant material coefficients, this model considers quadratic variations of elastic, piezoelectric, and dielectric coefficients with respect to the temperature graded. The mathematical modeling employs the separation of variables and asymptotic expansions of Bessel functions to derive comprehensive analytical solutions. A sliding contact interface with a sliding parameter is considered, enabling a more realistic simulation of composite structures. The dynamic governing equation, transverse deflection, and Maxwell's equation for electric potential are solved simultaneously across domains, yielding a system of linear homogeneous equations via admissible boundary conditions. The dispersion relations for shear waves are derived for electrically open and short-circuit cases and validated through comparison with existing studies. This study highlights the significant influence of temperature grade, temperature ratio, micro-length parameters in the piezoelectric microbeam, and the sliding parameter on shear wave propagation. The findings provide a theoretical basis for designing and optimizing piezotronic devices, offering enhanced control over elastic wave propagation in composite structures.</div></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":"142 ","pages":"Article 115983"},"PeriodicalIF":4.4,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143174950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Latent model-free adaptive control of nonlinear multivariable processes via virtual dynamic data modeling","authors":"Mingming Lin,&nbsp;Ronghu Chi","doi":"10.1016/j.apm.2025.115977","DOIUrl":"10.1016/j.apm.2025.115977","url":null,"abstract":"<div><div>Model free adaptive control has become an excellent method for complex processes with no model information available. However, the increasing scale of production in modern industries makes it difficult to model and control these processes. Therefore, a novel latent model-free adaptive control is proposed to deal with the high-dimension and collinearity problem of process variables in real-world industries. First, a nonlinear autoregressive moving average with exogenous input model is designed as a dynamical partial least squares inner relationship in the latent space to formulate the system input and output dynamics in a most common way. Then, a latent full-form dynamic linearization is developed to make the nonlinear model linearly parametric and a latent full-form dynamic linearization based virtual dynamical partial least squares data model is proposed consequently. An estimation algorithm is developed for identifying the unknown parameters of the virtual dynamical data model. By means of the virtual dynamical data model, the latent model-free adaptive control method is proposed by designing and optimizing a quadratic objective function. Theoretical analysis and simulation study confirm the efficiency of the latent model-free adaptive control.</div></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":"142 ","pages":"Article 115977"},"PeriodicalIF":4.4,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}