Journal of Computational and Nonlinear Dynamics最新文献

A Universal and Efficient Quadrilateral Shell Element Based on Absolute Nodal Coordinate Formulation for Thin Shell Structures with Complex Surfaces 基于绝对节点坐标计算的通用高效四边形壳元素，适用于具有复杂曲面的薄壳结构

IF 1.9 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2024-08-08 DOI: 10.1115/1.4066179

Binghua Zhang, Wei Fan, Hui Ren

{"title":"A Universal and Efficient Quadrilateral Shell Element Based on Absolute Nodal Coordinate Formulation for Thin Shell Structures with Complex Surfaces","authors":"Binghua Zhang, Wei Fan, Hui Ren","doi":"10.1115/1.4066179","DOIUrl":"https://doi.org/10.1115/1.4066179","url":null,"abstract":"\u0000 This work proposes a new quadrilateral shell element to analyze large deformations or rotations of membrane or shell structures. The element is an improvement of the previously proposed gradient deficient quadrilateral elements. The proposed element adopts three techniques to enhance its universality and efficiency. Firstly, an enriched field is added to make the element immune to in-plane mesh distortions. Secondly, local numerical curvilinear coordinates are used for curved surfaces where global curvilinear coordinates cannot be obtained analytically. Thirdly, the slope vector of the element is obtained by the cross-product of the two gradient vectors on each node, but interpolated inside the element to ensure continuity, especially for complex quadrilateral meshes. Additionally, this processing maintains the linear relationships between the shape functions and nodal coordinates, resulting in constant stiffness matrices. Several numerical examples show that this new element is universal for those irregularly curved surfaces and immune to mesh distortions. In addition, the efficiency is much higher compared to the traditional quadrilateral element.","PeriodicalId":54858,"journal":{"name":"Journal of Computational and Nonlinear Dynamics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141928432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Hyperbolic Contact Surface Winkler Contact Force Model for Spherical Clearance Joints 球形间隙接头的双曲线接触面温克勒接触力模型

IF 1.9 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2024-07-20 DOI: 10.1115/1.4066024

Huaibo Yao, L. Liang, W. Ma, Huibo Zhang, Yang Zhao

{"title":"A Hyperbolic Contact Surface Winkler Contact Force Model for Spherical Clearance Joints","authors":"Huaibo Yao, L. Liang, W. Ma, Huibo Zhang, Yang Zhao","doi":"10.1115/1.4066024","DOIUrl":"https://doi.org/10.1115/1.4066024","url":null,"abstract":"\u0000 Spherical clearance joints are essential for the successful deployment of space structures. When the clearance is small enough, the contacts will be considered conformal contact, which probably leads to inaccuracies in existing contact force models. To address the limitation, this paper proposes a novel hyperbolic contact surface Winkler model. Firstly, a new fundamental formula incorporating a modified variable exponent is presented. Based on the surrogate modeling method, an optimized surrogate function for the variable coefficient is developed. In the optimization process, the finite element and response surface methods are introduced to improve the precision and reliability of the model. Compared with previous models, this paper organizes a detailed discussion and evaluation to validate the accuracy and application of the new proposed model, after which a dynamic example demonstrates the model's effectiveness. The results highlight the model's accuracy and practical efficacy, showing a strong correlation and minimal margin of error, especially when compared to finite element method results. This improvement is attributed to the refined variable exponent, which accurately characterizes the relationship between contact force and penetration depth, and the optimized variable coefficient, which fine-tunes the contact force magnitude. Additionally, the model's versatility extends beyond the geometric properties of the contact bodies, offering a broad application scope. As a foundation of precise impact modeling, it is crucial to address the structural dynamic challenges inherent in high-precision space structures.","PeriodicalId":54858,"journal":{"name":"Journal of Computational and Nonlinear Dynamics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141820141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Deployment Dynamics and Control of a Hub-Spoke Tethered Satellite Formation Using Combined Arbitrary Lagrange-euler and Referenced Nodal Coordinate Formulation 使用任意拉格朗日-欧拉和参照节点坐标组合公式计算中枢-辐条系留卫星编队的部署动力学与控制

IF 1.9 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2024-07-20 DOI: 10.1115/1.4066043

Yu Wang, Weiyi Fan, Hui Ren

{"title":"Deployment Dynamics and Control of a Hub-Spoke Tethered Satellite Formation Using Combined Arbitrary Lagrange-euler and Referenced Nodal Coordinate Formulation","authors":"Yu Wang, Weiyi Fan, Hui Ren","doi":"10.1115/1.4066043","DOIUrl":"https://doi.org/10.1115/1.4066043","url":null,"abstract":"\u0000 A novel modeling framework combining arbitrary Lagrange-Euler and referenced nodal coordinate formulation (ALE-RNCF) is proposed for deployment dynamics and control of a hub-spoke tethered satellite formation. The ALE-RNCF approach allows for an accurate analysis of the intricate coupling effect between the orbit, attitude, and deployment dynamics, and its strengths lie in overcoming the accuracy loss and low-efficiency issues when dealing with spatial and temporal multiscale problems. Specifically, the orbital and attitude motions are separated with vibrations of the variable-length ALE tethers through the RNCF, which is the main distinguishing feature over the widely-used absolute nodal coordinate formulation. To achieve stable deployment, the control torque is added to the central satellite by employing the proportional-differential algorithm, where the maximum tension of tethers or the spinning angular velocity is selected as the control object. Various cases with different deployment velocities, target tensions, and orbital heights are simulated and corresponding effects on the deployment performance are analyzed. The proposed ALE-RNCF approach provides a comprehensive understanding of the orbit-attitude-structure coupled behavior during the deployment of the hub-spoke tethered satellite formation and contributes to the development of effective control strategies.","PeriodicalId":54858,"journal":{"name":"Journal of Computational and Nonlinear Dynamics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141820630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical and Analytical Study for the Stochastic Spatial Dependent Prey-Predator Dynamical System 随机空间依赖性猎物-捕食者动态系统的数值和分析研究

IF 1.9 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2024-07-20 DOI: 10.1115/1.4066038

M. Z. Baber, Muhammad Waqas Yasin, Changjin Xu, Nauman Ahmed, M. Iqbal

{"title":"Numerical and Analytical Study for the Stochastic Spatial Dependent Prey-Predator Dynamical System","authors":"M. Z. Baber, Muhammad Waqas Yasin, Changjin Xu, Nauman Ahmed, M. Iqbal","doi":"10.1115/1.4066038","DOIUrl":"https://doi.org/10.1115/1.4066038","url":null,"abstract":"\u0000 Prey and predator are the important factor of the ecosystem. Generally, it is considered that prey-predator models depends on time and it is only required nonlinear system of equations for its dynamical study. But it is observed that such species can move from one to place to another and in such a way there is a need of nonlinear equations which also depends on spatial as well. The stochastic prey-predator system is investigated numerically and analytically. The proposed stochastic NSFD is used for numerical study; it is consistent with given system and its linear stability analysis showed that it is unconditionally stable. There are 2 equilibria one is predator free and second is coexistence equilibrium. These equilibria are successfully gained in the numerical case. Extended generalized Riccati equation mapping method is applied for analytical study. The obtained solutions are of the form rational, hyperbolic, trigonometric. For the comparative study, the unique physical problems are developed and their simulations are drawn for various choices of the parameters. The graphical behavior depict the ecacy of our study.","PeriodicalId":54858,"journal":{"name":"Journal of Computational and Nonlinear Dynamics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141819418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Improved Wiener Path Integral Approach for Stochastic Response Estimation of Nonlinear Systems Under Non-White Excitation 非白激励下非线性系统随机响应估计的改进型维纳路径积分法

IF 1.9 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2024-07-18 DOI: 10.1115/1.4065959

Ying Zhao, Fengyu Fan

{"title":"An Improved Wiener Path Integral Approach for Stochastic Response Estimation of Nonlinear Systems Under Non-White Excitation","authors":"Ying Zhao, Fengyu Fan","doi":"10.1115/1.4065959","DOIUrl":"https://doi.org/10.1115/1.4065959","url":null,"abstract":"\u0000 An improved Wiener path integral (WPI) approach is developed for predicting the stochastic response probability density functions (PDFs) of nonlinear systems under non-white excitation. Specifically, the excitation process is modeled as the output of a filter whose input is Gaussian white noise, the joint response PDF of the nonlinear system is expressed as a functional integral of the stochastic action over the space of all possible trajectories between the initial and final states, and the second-order variation of the stochastic action is recast to a quadratic form and taken into account in the estimation of the joint response PDF. Compared to the standard WPI approach where the second-order variation of the stochastic action is regarded as a constant, the improved WPI approach developed herein considers the fluctuations of the second-order variation of the stochastic action in the computational domain, thus improving the accuracy of the stochastic response estimation. Two numerical examples are illustrated, and the non-stationary response PDFs estimated by the improved WPI approach agree well with the Monte Carlo simulation results.","PeriodicalId":54858,"journal":{"name":"Journal of Computational and Nonlinear Dynamics","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141825297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Moving Horizon Estimation for a Class of Soft Continum Manipulators 一类软连续操纵器的移动地平线估计

IF 2 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2024-06-04 DOI: 10.1115/1.4065670

G. Bastos

{"title":"A Moving Horizon Estimation for a Class of Soft Continum Manipulators","authors":"G. Bastos","doi":"10.1115/1.4065670","DOIUrl":"https://doi.org/10.1115/1.4065670","url":null,"abstract":"\u0000 This work proposes a formulation for the moving horizon estimation technique considering both states and parameters obtained simultaneously with reduced estimation issues. The parameters can be either constant or time-varying, while states are related to complex output trajectories related to underactuated systems. Particularly, the proposed formulation considers additional equality constraints as a counterpart of the dynamics tube-MPC. Thus, it becomes less dependent on probabilistic information, such as probability density function and covariance of the process noise. In addition, the calibration of the method parameters has less sensitivity and driven by the tube constraints. The proposed approach can be applied in different systems; however, here it is detailed for a class of soft continuum manipulators with fluidic actuation through a variable flow rate and demonstrated with numerical simulations in planar motion. Results indicate robustness of the algorithm estimation in a challenging scenario arising from underactuation as well as in the presence of uncertainty and external disturbance, while simultaneously states and a vector of structural parameters are coherently estimated.","PeriodicalId":54858,"journal":{"name":"Journal of Computational and Nonlinear Dynamics","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141267460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Physics Guided Machine Learning Approach to Safe Quasi-Static Impact Situations In Human-Robot Collaboration 人机协作中安全准静态撞击情况的物理引导机器学习方法

IF 2 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2024-06-04 DOI: 10.1115/1.4065671

Nemanja I. Kovincic, H. Gattringer, Andreas Mueller, Mathias Brandstotter

{"title":"Physics Guided Machine Learning Approach to Safe Quasi-Static Impact Situations In Human-Robot Collaboration","authors":"Nemanja I. Kovincic, H. Gattringer, Andreas Mueller, Mathias Brandstotter","doi":"10.1115/1.4065671","DOIUrl":"https://doi.org/10.1115/1.4065671","url":null,"abstract":"\u0000 Following the performance and force limitation method of the ISO/TS 15066 standard, safety of a human-robot collaboration task is assessed for critical situations assuming quasi-static impact. To this end, impact forces and pressures are experimentally measured and compared with limit values specified by ISO/TS 15066. Consequently, such a safety assessment must be repeated whenever something changes in the collaborative workspace or the task, which severely limits the flexibility of collaborative systems. To overcome this problem, in this paper a physics guided machine learning (ML) method for prediction of peak impact forces, within predefined modification dimensions of collaborative applications, is proposed. Along with a pose-dependent linearized model, an ensemble of boosted decision tree (BDT) in combination with a feed-forward neural network (NN) is trained with peak impact forces measured at a UR10e robot covering the range of interest. A generic pick and place task with two modification dimensions is considered as an example of the presented methodology. The method yields the maximal safe impact velocity in the collaborative workspace.","PeriodicalId":54858,"journal":{"name":"Journal of Computational and Nonlinear Dynamics","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141265542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

GESO based RISE Controller for Active Flutter Suppression for Aeroelastic System 基于 GESO 的 RISE 控制器用于航空弹性系统的主动扑翼抑制

IF 2 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2024-05-21 DOI: 10.1115/1.4065569

Balraj Sharma, Pooja Agrawal, Ajay Misra

{"title":"GESO based RISE Controller for Active Flutter Suppression for Aeroelastic System","authors":"Balraj Sharma, Pooja Agrawal, Ajay Misra","doi":"10.1115/1.4065569","DOIUrl":"https://doi.org/10.1115/1.4065569","url":null,"abstract":"\u0000 The paper presents a Robust Integral of Signum of Error (RISE) controller for active suppression of flutter of a two dimensional aerofoil and it is integrated with a General Extended State Observer (GESO). Towards this, aerofoil model in state space is first changed into a canonical form. Then, the controller is designed using RISE control technique. As equations of system dynamics are not into integral chain form, a GESO is formulated to observe system states and disturbances. The controller is implemented using estimated states and it is robustified using estimated disturbance. Stability of the proposed GESO-RISE controller is established using the Lyapunov theory. Simulations are performed to check the proposed controller's performance against variations in airspeed, uncertainties in model parameters, external disturbances, time delay and unmodeled dynamics. Comparison of the proposed GESO-RISE controller is carried out with existing controllers using two performance criteria i.e. Control Efforts and Integral of Absolute Error (IAE). It is discovered from simulations that the proposed GESO-RISE controller significantly reduces IAE and control efforts. Additionally, Monte Carlo method is utilized to check robustness of the proposed GESO-RISE controller. The proposed GESO-RISE controller significantly enhances flutter boundary of aerofoil and is completely implementable.","PeriodicalId":54858,"journal":{"name":"Journal of Computational and Nonlinear Dynamics","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141117458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Hybrid Continuation Framework for Analyzing Nonlinear Normal Modes of Systems With Contact Nonlinearity 分析具有接触非线性的系统的非线性法向模态的混合连续框架

IF 2 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2024-05-13 DOI: 10.1115/1.4064272

Shih-Chun Huang, Meng-Hsuan Tien

{"title":"A Hybrid Continuation Framework for Analyzing Nonlinear Normal Modes of Systems With Contact Nonlinearity","authors":"Shih-Chun Huang, Meng-Hsuan Tien","doi":"10.1115/1.4064272","DOIUrl":"https://doi.org/10.1115/1.4064272","url":null,"abstract":"\u0000 The prediction of the modal properties of structural systems with contact clearances and prestress presents a computational challenge, as the nonlinearity induced by piecewise-linear stiffness eliminates the use of efficient linear modal analysis techniques. The most common approach to obtaining the nonlinear normal modes (NNMs) of these structural systems is a numerical framework that integrates numerical integration, the shooting method, and the pseudo-arc-length continuation scheme. This numerical continuation framework (NCF) computes NNMs through iterative numerical calculations; thus, the computational cost of the nonlinear modal analysis of complex nonlinear systems, particularly piecewise-linear systems, becomes prohibitively expensive as the model size increases. In this study, a hybrid continuation framework (HCF) combining analytic and numerical methods is proposed to enable efficient computations of NNMs for systems with contact boundaries. This new hybrid framework utilizes a semi-analytic method to conduct the iterative shooting procedure; thus, the computational burden of the numerical continuation can be significantly reduced. The proposed method is demonstrated on spring-mass oscillators with contact elements, and the NNMs obtained using the proposed method are validated by those computed using the traditional numerical continuation framework. The modal properties of the systems can be computed using the proposed framework with significant speed-up. Furthermore, the modal properties, including internal resonance and sharp turning in NNM curves, of the piecewise-linear systems are identified and discussed.","PeriodicalId":54858,"journal":{"name":"Journal of Computational and Nonlinear Dynamics","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140984341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analytical Properties and Numerical Preservation of an Age-Group Sir Model: Application to the Diffusion of Information 年龄组爵士模型的分析特性和数值保存：应用于信息扩散

IF 2 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2024-05-06 DOI: 10.1115/1.4065437

A. Cardone, Patricia Diaz de Alba, B. Paternoster

引用次数: 0