Applied Mathematical Modelling最新文献_第2页

Time-fractionated anisotropic osmosis with bilateral total variation for effective shadow mitigation in image processing 利用各向异性时间分馏渗透与双边总变化，在图像处理中有效减少阴影

IF 4.4 2区工程技术

Applied Mathematical Modelling Pub Date : 2024-09-03 DOI: 10.1016/j.apm.2024.115671

引用次数: 0

Dynamics of irregular hyperelastic substrate under the impact of moving load 移动载荷冲击下不规则超弹性基底的动力学特性

IF 4.4 2区工程技术

Applied Mathematical Modelling Pub Date : 2024-09-02 DOI: 10.1016/j.apm.2024.115667

{"title":"Dynamics of irregular hyperelastic substrate under the impact of moving load","authors":"","doi":"10.1016/j.apm.2024.115667","DOIUrl":"10.1016/j.apm.2024.115667","url":null,"abstract":"<div><p>This work delves into the study of stresses induced in a non-homogeneous pre-stressed nearly incompressible elastic substrate with irregularity as a result of a normal load moving on its rough surface. The irregularity on the free surface of the substrate is considered in the form of parabolic irregularity. The solution methodology features the applicability of perturbation method along with substitution method to obtain the displacement components. The expressions of the induced shear and normal stresses have been established in closed form, and their expressions for special cases of the considered problem have also been deduced, which concur well with the existing literature. The influences of affecting parameters viz., non-homogeneity, frictional coefficient, irregularity factor, irregularity depth, hydrostatic stress and depth of the substrate on shear and normal stresses have been depicted graphically by means of numerical computation. The computational results have been manifested for distinct cases of irregularity zone involving parabolic as well as rectangular irregularities present in the considered geometrical model. It has been figured out that the presence of non-homogeneity in the irregular substrate has significant impact on the developed stresses.</p></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0307904X24004207/pdfft?md5=b0e866b8d295f26ece9957c99b51f966&pid=1-s2.0-S0307904X24004207-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142136139","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}

引用次数: 0

Optimization approaches to Wolbachia-based biocontrol 基于 Wolbachia 的生物控制优化方法

IF 4.4 2区工程技术

Applied Mathematical Modelling Pub Date : 2024-09-02 DOI: 10.1016/j.apm.2024.115663

{"title":"Optimization approaches to Wolbachia-based biocontrol","authors":"","doi":"10.1016/j.apm.2024.115663","DOIUrl":"10.1016/j.apm.2024.115663","url":null,"abstract":"<div><p>This paper proposes two realistic and biologically viable methods for <em>Wolbachia</em>-based biocontrol of <em>Aedes aegypti</em> mosquitoes, assuming imperfect maternal transmission of the <em>Wolbachia</em> bacterium, incomplete cytoplasmic incompatibility, and direct loss of <em>Wolbachia</em> infection caused by thermal stress. Both methods are based on optimization approaches and allow for the stable persistence of <em>Wolbachia</em>-infected mosquitoes in the wild <em>Ae. aegypti</em> populations in a minimum time and using the smallest quantity of <em>Wolbachia</em>-carrying insects to release. The first method stems from the continuous-time optimal release strategy, which is further transformed into a sequence of suboptimal impulses mimicking instantaneous releases of <em>Wolbachia</em>-carrying insects. The second method constitutes a novel alternative to all existing techniques aimed at the design of release strategies. It is developed using metaheuristics (<em>ϵ</em>-constraint method combined with the genetic algorithm) and directly produces a discrete sequence of decisions, where each element represents the quantity of <em>Wolbachia</em>-carrying mosquitoes to be released instantaneously and only once per a specified time unit. It turns out that a direct discrete-time optimization (second method) renders better quantifiable results compared to transforming a continuous-time optimal release function into a sequence of suboptimal impulses (first method). As an illustration, we provide examples of daily, weekly, and fortnightly release strategies designed by both methods for two <em>Wolbachia</em> strains, <em>w</em>Mel and <em>w</em>MelPop.</p></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0307904X24004165/pdfft?md5=f74ced743bf996fb868a1310b46af648&pid=1-s2.0-S0307904X24004165-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142136140","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}

引用次数: 0

Examination of the complementary energy principle in modified couple stress theory and its application for analysis of size effects in the internal force field of functionally graded microbeams 检验修正耦合应力理论中的互补能量原理及其在分析功能分级微梁内力场尺寸效应中的应用

IF 4.4 2区工程技术

Applied Mathematical Modelling Pub Date : 2024-09-01 DOI: 10.1016/j.apm.2024.115662

{"title":"Examination of the complementary energy principle in modified couple stress theory and its application for analysis of size effects in the internal force field of functionally graded microbeams","authors":"","doi":"10.1016/j.apm.2024.115662","DOIUrl":"10.1016/j.apm.2024.115662","url":null,"abstract":"<div><p>The precise quantification of the internal force field in MEMS piezoresistive sensor micro structure is crucial for ensuring accurate signal output. This paper proposes and proves the complementary energy principle associated with modified couple stress theory (MCST) based on the linear elasticity assumption. And this principle is used to discuss and analyze whether there is a size effect in the internal force field of functionally graded (FG) micro beams for the MEMS piezoresistive sensor. The results show that the size effects exist in the internal forces and the stationary point coordinate <em>x</em> of the total moment for the micro beam. The size effects are related to the dimensionless material scale parameter <em>l/h</em>, the supported spring stiffness, the temperature and the support rotational movements. Intuitive explanations of the size effects are given for the internal force fields and its stationary point coordinates. Behaviors of the solutions agree with the published data when the MCST degenerates into the classical theory (CT).</p></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0307904X24004153/pdfft?md5=f8b4971c04df668e320d2e86a6151f45&pid=1-s2.0-S0307904X24004153-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142162863","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}

引用次数: 0

Application of a high-performance grey prediction model to predict the cardiovascular disease mortality in elderly Chinese residents 应用高性能灰色预测模型预测中国老年居民的心血管疾病死亡率

IF 4.4 2区工程技术

Applied Mathematical Modelling Pub Date : 2024-08-31 DOI: 10.1016/j.apm.2024.115664

{"title":"Application of a high-performance grey prediction model to predict the cardiovascular disease mortality in elderly Chinese residents","authors":"","doi":"10.1016/j.apm.2024.115664","DOIUrl":"10.1016/j.apm.2024.115664","url":null,"abstract":"<div><p>With the acceleration of urbanization and aging process, an increasing number of Chinese senior citizens are suffering from cardiovascular diseases (CVDs). Therefore, reducing the prevalence and mortality of CVD has become one of the priorities of the public health department. And the scientific prediction of CVD morality is of great significance in the prevention and treatment of CVD among the elderly. Given the characteristics of “small sample, complex causes and long duration” of CVD among the senior citizens, grey prediction models which aim at handling the data with “small sample, poor information” are more feasible in forecasting its developing trend. In this paper, a new discrete grey prediction model is designed to forecast the CVD morality among Chinese senior citizens, in which a non-linear function is introduced to expand the model structure and the order and background value coefficient are optimized. In all the three sets of experiments, the errors of the new model are close to but smaller than those of the other three mainstream grey prediction models, indicating that the simulation and prediction performance of the new model is more accurate and stable. The research provides a new modelling approach to predicting the CVD mortality among Chinese senior citizens, which is conducive to the prevention of CVD prevalence and the sustainable development of public health.</p></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0307904X24004177/pdfft?md5=75fdf45d02a21abfe5c170136909c6b1&pid=1-s2.0-S0307904X24004177-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142169403","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}

引用次数: 0

On the bullwhip effect in circular supply chains combining by-products and end-of-life returns 副产品与报废回收相结合的循环供应链中的牛鞭效应

IF 4.4 2区工程技术

Applied Mathematical Modelling Pub Date : 2024-08-31 DOI: 10.1016/j.apm.2024.115670

{"title":"On the bullwhip effect in circular supply chains combining by-products and end-of-life returns","authors":"","doi":"10.1016/j.apm.2024.115670","DOIUrl":"10.1016/j.apm.2024.115670","url":null,"abstract":"<div><p>The move towards a circular economy represents an urgent need for production and distribution systems. For this reason, traditional supply chains must rearrange their structures and configurations to reduce virgin material extraction, as well as production and end-of-life products that are sent to landfill. However, many questions regarding the dynamic behavior of circular supply chains remain unsolved. The aim of this work is to contribute to the literature on circular supply chains by investigating their dynamics when there are several reverse loops, <em>i.e.,</em> the products delivered to the final customer have been either produced from virgin materials, by the remanufacturing of end-of-life products, or by the use of by-products generated in another supply chain. Using a full factorial design of experiments and a difference equation modelling approach, a wide range of supply chain scenarios with different return and by-product usage rates are analyzed, and their dynamic and economic performance is evaluated. Our results suggest that there is a combined effect of the return rate and the by-product rate on the dynamic behavior of the supply chain. When their combination exceeds a stability threshold, the order amplification disappears, at the expense of unmanageable inventories. However, they also show that, below this threshold, circular supply chains can outperform traditional ones.</p></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0307904X24004232/pdfft?md5=99827f634cd6c61acf20cb0a8343dd04&pid=1-s2.0-S0307904X24004232-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142144297","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}

引用次数: 0

Coupling vibration analysis of hub motor driving electric vehicle and sandwich plate road 驱动电动汽车的轮毂电机与夹芯板路面的耦合振动分析

IF 4.4 2区工程技术

Applied Mathematical Modelling Pub Date : 2024-08-30 DOI: 10.1016/j.apm.2024.115668

{"title":"Coupling vibration analysis of hub motor driving electric vehicle and sandwich plate road","authors":"","doi":"10.1016/j.apm.2024.115668","DOIUrl":"10.1016/j.apm.2024.115668","url":null,"abstract":"<div><p>In order to solve the problem of the deterioration of the vehicle vertical vibration caused by the introduction of hub motor, to study the interaction mechanism between the electric vehicle (EV) and the road, to analyze the coupling relationship between vehicle vibration and unbalanced electromagnetic force, road surface irregularity, road vibration and other factors and their influence on the vertical performance of the vehicle, the hub motor driving EV and sandwich plate road coupling model is proposed and established. The electromagnetic excitation of switched reluctance motor (SRM) is obtained with Maxwell's tensor theory, the vertical dynamic response of viscoelastic sandwich plat road system is derived analytically by the methods of Galerkin and Duhamel integral, and then the proposed solution is verified by comparing the measurement data in the references. On this basis, the effects of motor excitation, road surface irregularity, vehicle-road coupling vibration and vehicle speed on road and vehicle response are analyzed. The results show that motor excitation has greater influence on the road response, followed by the influence of vehicle-road coupling, and motor excitation make the road response increase and fluctuate. Motor excitation has greater effects on tire dynamic load, body acceleration and roll angle acceleration, followed by suspension dynamic deformation and pitch angle acceleration, and the influence of vehicle-road coupling on vehicle response is relatively small. Moreover, when driving at low speed and smooth road, the effects of motor excitation and vehicle-road coupling vibration on vehicle response is more prominent and should be taken seriously. The negative effects introduced by the comprehensive excitations need to be considered in actual engineering and vertical dynamic analysis of hub motor driving EVs.</p></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0307904X24004219/pdfft?md5=67c9a858831912b85e1ec395a7deadcd&pid=1-s2.0-S0307904X24004219-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142144298","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}

引用次数: 0

Pipe merging for transient gas network optimization problems 瞬态燃气管网优化问题的管道合并

IF 4.4 2区工程技术

Applied Mathematical Modelling Pub Date : 2024-08-30 DOI: 10.1016/j.apm.2024.115660

引用次数: 0

Generating non-Gaussian rough surfaces using analytical functions and spectral representation method with an iterative algorithm 利用分析函数和光谱表示法以及迭代算法生成非高斯粗糙表面

IF 4.4 2区工程技术

Applied Mathematical Modelling Pub Date : 2024-08-30 DOI: 10.1016/j.apm.2024.115665

引用次数: 0

Sensitivity analysis of frequency response functions with imaginary parts decoupling based on multicomplex-step perturbation 基于多复步扰动的频率响应函数虚部解耦灵敏度分析

IF 4.4 2区工程技术

Applied Mathematical Modelling Pub Date : 2024-08-29 DOI: 10.1016/j.apm.2024.115669

{"title":"Sensitivity analysis of frequency response functions with imaginary parts decoupling based on multicomplex-step perturbation","authors":"","doi":"10.1016/j.apm.2024.115669","DOIUrl":"10.1016/j.apm.2024.115669","url":null,"abstract":"<div><p>Imaginary perturbation is used in the complex step differentiation method to compute first-order derivatives, widely known as an effective approach for sensitivity analysis in structural dynamics. However, coupling of imaginary parts occurs in the damped frequency response functions when employing this method. To mitigate this coupling, a novel approach for sensitivity analysis based on multicomplex-step perturbation is proposed in this paper, for sensitivity analysis of Frequency Response Functions in structural dynamics. The structural parameters are perturbed in multicomplex domain, the dimensions of structural matrices are expanded using the Cauchy Riemann matrix representation, the equation of motion for sensitivity analysis in frequency domain is transformed to matrix operation in field of real numbers, imaginary term will not exist in the equation of motion for sensitivity analysis, the imaginary part of the frequency response function and the imaginary part of the perturbation are decoupled, the structural frequency response functions and the corresponding sensitivities are obtained from the dimension-expanded equation of motion. A truss structure and a solar wing are adopted to verify the accuracy of the proposed method. Results show that the sensitivity of FRFs can be effectively calculated using the proposed method. Compare to the finite difference method, the proposed method is not depended on the step-size selection procedure. The multi-order and mixed-order sensitivity matrices, especially Hessian matrix can also be obtained using the proposed method.</p></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0307904X24004220/pdfft?md5=adc53ca935b69b8b970dbdfaaed2b7b4&pid=1-s2.0-S0307904X24004220-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142149736","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}

引用次数: 0