Journal of Computational and Nonlinear Dynamics最新文献_第10页

Fixed-Time Synchronization of Fractional-Order Multilayer Complex Networks via a New Fixed-Time Stability Theorem 基于新固定时间稳定性定理的分数阶多层复杂网络的固定时间同步

IF 2 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2023-03-27 DOI: 10.1115/1.4062200

Luo Runzi, Zijun Song, Shuai Liu, Jiaojiao Fu, Fang Zhang

引用次数: 0

Semi-Implicit Integration and Data-Driven Model Order Reduction in Structural Dynamics With Hysteresis 结构动力学中的半隐式积分与数据驱动模型降阶

4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2023-03-20 DOI: 10.1115/1.4057042

Bidhayak Goswami, Anindya Chatterjee

{"title":"Semi-Implicit Integration and Data-Driven Model Order Reduction in Structural Dynamics With Hysteresis","authors":"Bidhayak Goswami, Anindya Chatterjee","doi":"10.1115/1.4057042","DOIUrl":"https://doi.org/10.1115/1.4057042","url":null,"abstract":"Abstract Structural damping is often empirically rate-independent wherein the dissipative part of the stress depends on the history of deformation but not its rate of change. Hysteresis models are popular for rate-independent dissipation; and a popular hysteresis model is the Bouc-Wen model. If such hysteretic dissipation is incorporated in a refined finite element model, then the model involves the usual structural dynamics equations along with nonlinear nonsmooth ordinary differential equations for a large number of internal hysteretic states at Gauss points used within the virtual work calculation. For such systems, numerical integration is difficult due to both the distributed nonanalytic nonlinearity of hysteresis as well as large natural frequencies in the finite element model. Here, we offer two contributions. First, we present a simple semi-implicit integration approach where the structural part is handled implicitly based on the work of Piché, while the hysteretic part is handled explicitly. A cantilever beam example is solved in detail using high mesh refinement. Convergence is good for lower damping and a smoother hysteresis loop. For a less smooth hysteresis loop and/or higher damping, convergence is noted to be roughly linear on average. Encouragingly, the time-step needed for stability is much larger than the time period of the highest natural frequency of the structural model. Subsequently, data from several simulations conducted using the above semi-implicit method are used to construct reduced order models of the system, where the structural dynamics is projected onto a few modes and the number of hysteretic states is reduced significantly as well. Convergence studies of error against the number of retained hysteretic states show very good results.","PeriodicalId":54858,"journal":{"name":"Journal of Computational and Nonlinear Dynamics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135035243","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

Equivalent Beam Model and Improved Structure Design of Large Space Antenna Truss with Geometric Nonlinearity 几何非线性大空间天线桁架等效梁模型及改进结构设计

IF 2 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2023-03-06 DOI: 10.1115/1.4057043

Jiang Shi, Cai Guo-Ping

引用次数: 1

A 2D Corotational Beam Formulation Based On the Local Frame of Special Euclidean Group SE(2) 基于特殊欧几里得群SE(2)局部框架的二维旋转梁公式

IF 2 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2023-03-06 DOI: 10.1115/1.4057044

Pu You, Zhuyong Liu, Ziqi Ma

{"title":"A 2D Corotational Beam Formulation Based On the Local Frame of Special Euclidean Group SE(2)","authors":"Pu You, Zhuyong Liu, Ziqi Ma","doi":"10.1115/1.4057044","DOIUrl":"https://doi.org/10.1115/1.4057044","url":null,"abstract":"\u0000 The corotational frame method is widely used in the simulation of flexible multibody dynamics. Its core idea is to separate the rigid motion from the flexible deformation so that it can make fully exploit a large number of excellent local finite elements. The essence of the conventional corotational frame method is the projection relationship between the element frame and the global frame. This paper explores another coordinate projection method for 2D corotational beam element. The projection relationship between the element frame and the local frame in the framework of Lie algebra se(2) has been proposed. Based on the description of SE(2), the formulation of corotational beam element and integration algorithm is presented. The local frame description greatly reduces the nonlinearity of the formula by eliminating the effect of the rigid body motion on the projection matrix, internal force and inertial force. Several examples of large deformation and or large rotation are performed, and it is found that the step-size convergence and iterative convergence of SE(2) description are improved compared with ℝ3 description. In additionMoreover, some examples are used given to verify that the frame invariance brought by SE(2)the coordinate transformation is valuable for improving computing efficiency. The presented transformation method can easily extend to other 2D corotational elements.","PeriodicalId":54858,"journal":{"name":"Journal of Computational and Nonlinear Dynamics","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90690328","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

Define the Lyapunov Exponents for ψ-Fractional Differential System 定义了ψ-分数阶微分系统的Lyapunov指数

IF 2 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2023-03-06 DOI: 10.1115/1.4057041

N'Gbo N'Gbo, Jianhua Tang

引用次数: 1

Unconditionally Stable Numerical Scheme for Heat Transfer of Mixed Convective Darcy-Forchheimer Flow of Micropolar Fluid Over Oscillatory Moving Sheet 振荡移动薄片上微极流体混合对流达西-福希海默流动换热的无条件稳定数值格式

IF 2 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2023-02-24 DOI: 10.1115/1.4056969

Y. Nawaz, M. Arif, K. Abodayeh

{"title":"Unconditionally Stable Numerical Scheme for Heat Transfer of Mixed Convective Darcy-Forchheimer Flow of Micropolar Fluid Over Oscillatory Moving Sheet","authors":"Y. Nawaz, M. Arif, K. Abodayeh","doi":"10.1115/1.4056969","DOIUrl":"https://doi.org/10.1115/1.4056969","url":null,"abstract":"\u0000 A third-order numerical scheme is proposed for the time discretization of time-dependent partial differential equations (PDEs). This third-order proposed scheme is further modified, and the new scheme is obtained with second-order accuracy in time and is unconditionally stable. The stability of the new scheme is proved by employing von Neumann stability analysis. For spatial discretization, a compact fourth-order scheme is adopted. Moreover, a mathematical model for heat transfer of Darcy-Forchheimer flow of Micropolar fluid is modified with an oscillatory sheet, nonlinear mixed convection, thermal radiation and viscous dissipation. The suitable transformations are considered to transform the dimensional system of PDEs into dimensionless PDEs and further solve this system using the proposed numerical scheme. It is found that velocity and angular velocity have dual behaviour by incrementing coupling parameters. The proposed second-order accurate in-time scheme is compared with the existing Crank-Nicolson scheme. The proposed scheme is shown to have faster convergence than the existing scheme with the same accuracy. We anticipated this would help investigators address outstanding challenges in industrial and engineering enclosures.","PeriodicalId":54858,"journal":{"name":"Journal of Computational and Nonlinear Dynamics","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84261310","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: 1

Predicting Nonlinear Modal Properties by Measuring Free Vibration Responses 通过测量自由振动响应预测非线性模态特性

IF 2 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2023-02-23 DOI: 10.1115/1.4056949

Shih-Chun Huang, Hao-Wen Chen, Meng-Hsuan Tien

{"title":"Predicting Nonlinear Modal Properties by Measuring Free Vibration Responses","authors":"Shih-Chun Huang, Hao-Wen Chen, Meng-Hsuan Tien","doi":"10.1115/1.4056949","DOIUrl":"https://doi.org/10.1115/1.4056949","url":null,"abstract":"\u0000 Identifying dynamical system models from measurements is a central challenge in the structural dynamics community. Nonlinear system identification, in particular, is of great challenge since there are combinatorically many possible model structures which requires expert knowledge for constructing an appropriate model. Furthermore, traditional nonlinear system identification methods require a steady excitation input that is not always available in many practical applications. Recently, a technique referred to as the sparse identification of nonlinear dynamics (SINDy) algorithm was developed for discovering mathematical models of general nonlinear systems. The SINDy method is able to find a generalized linear state-space model for the autonomous nonlinear system by analyzing the collected response data. In this work, the SINDy method is adapted and combined with the shooting method and numerical continuation technique to form a system identification platform that is capable of predicting the nonlinear modal properties of mechanical oscillators. The proposed platform is able to predict the nonlinear normal modes (NNMs) of these systems by processing the noised data of their free vibration response. Also, the NNMs and internal resonance of the nonlinear systems at a high energy level can be captured using the proposed technique by processing the response data at a lower energy level. The proposed method is numerically demonstrated on a two degree of freedom mechanical oscillator. Furthermore, the effects of measurement error and excitation condition on the NNMs prediction are investigated. The NNM prediction platform presented in this paper is applicable to a variety of nonlinear systems.","PeriodicalId":54858,"journal":{"name":"Journal of Computational and Nonlinear Dynamics","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87755948","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

Feasibility Study of Upper Limb Control Method Based On EMG-Angle Relation 基于肌电-角度关系的上肢控制方法可行性研究

IF 2 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2023-02-16 DOI: 10.1115/1.4056918

Bianca Lento, Y. Aoustin, T. Zielińska

引用次数: 0

Energy-Efficient Actuator Design Principles For Robotic Leg Prostheses And Exoskeletons: A Review Of Series Elasticity And Backdrivability 机器人假肢和外骨骼的节能致动器设计原则:系列弹性和反驾驶性综述

IF 2 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2023-02-16 DOI: 10.1115/1.4056919

Brokoslaw Laschowski, J. McPhee

{"title":"Energy-Efficient Actuator Design Principles For Robotic Leg Prostheses And Exoskeletons: A Review Of Series Elasticity And Backdrivability","authors":"Brokoslaw Laschowski, J. McPhee","doi":"10.1115/1.4056919","DOIUrl":"https://doi.org/10.1115/1.4056919","url":null,"abstract":"\u0000 Robotic leg prostheses and exoskeletons have traditionally been designed using highly-geared motor-transmission systems that minimally exploit the passive dynamics of human locomotion, resulting in inefficient actuators that require significant energy consumption and thus provide limited battery-powered operation or require large onboard batteries. Here we review two of the leading energy-efficient actuator design principles for legged and wearable robotic systems: series elasticity and backdrivability. As shown by inverse dynamic simulations of walking, there are periods of negative joint work that can increase efficiency by recycling some of the otherwise dissipated energy using series elastic actuators and/or backdriveable actuators with energy regeneration. Series elastic actuators can improve shock tolerance during foot-ground impacts and reduce the peak power and energy consumption of the motor via mechanical energy storage and return. However, actuators with series elasticity tend to have lower output torque, increased mass and architecture complexity due to the added physical spring, and limited force and torque control bandwidth. High torque density motors with low-ratio transmissions, known as quasi-direct drives, can likewise achieve low output impedance and high backdrivability, allowing for safe and compliant human-robot physical interactions, in addition to energy regeneration. However, torque-dense motors tend to have higher Joule heating losses, greater motor mass and inertia, and require specialized motor drivers for real-time control. While each actuator design has advantages and drawbacks, designers should consider the energy-efficiency of robotic leg prostheses and exoskeletons during various locomotor activities of daily living.","PeriodicalId":54858,"journal":{"name":"Journal of Computational and Nonlinear Dynamics","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72481781","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: 2

Reviewer's Recognition 评论家的认可

4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2023-02-15 DOI: 10.1115/1.4056804

{"title":"Reviewer's Recognition","authors":"","doi":"10.1115/1.4056804","DOIUrl":"https://doi.org/10.1115/1.4056804","url":null,"abstract":"V. AgarwalA. AhmedA. AlanA. AlneamyM. AwadE. BabilioD. BahugunaS. BaiW. BaiB. BalaramH. BartlettD. BartonH. BaskonusC. BasquerottoO. BauchauM. BeitelschmidtM. BelhaqL. BencsikB. BergeotB. BernardC. BordonsC. BoseM. BukhariP. Calas Lopes PachecoA. CallejoP. CampW. CaoJ. CapcoG. CarboneD. CaruntuP. CarvalhoD. ChenF. ChenZ. ChenD. CostaM. CostelloK. D'SouzaA. DabiriS. DasT. DasI. DassiosE. DiehlH. DingF. DohnalD. DopicoG. DurandauK. EllermannJ. EscalonaA. FantettiB. FeenyJ. FelezJ. Fernández AceitunoA. FominC. GastaldiH. GattringerJ. GerstmayrA. GhadamiJ. Gómez-AguilarF. GonzalezF. GordilloX. GouR. GreggZ. GuoP. GuptaS. GuptaA. HajjajP. HassanpourD. HuJ. HuangB. HusseinH. JafariM. JesussekY. JinN. KacemA. KahramanS. KimA. KlodowskiJ. KnowlesV. KoumousisM. KrackI. KrishnaD. KumarS. KumarS. KuntanapreedaD. KunzC. LiJ. LiR. LiX. LiX. LiS. LiangH. LiaoS. LiaoZ. LiuA. LopesS. LychevJ. MaY. MagaraX. MaoA. MaratheV. MartsenyukP. MasaratiV. MataM. MeywerkT. MiJ. MoehlisM. MorandiniJ. Moreno-ValenzuelaD. Najera-FloresS. NarayananD. NegrutD. NguyenR. NigmatullinE. OkabeP. OlejnikG. OrzechowskiF. ÖzköseC. PadmanabhanY. PanP. PolachB. PopaM. PoursinaL. PugiF. QianD. QuinnA. RecueroM. ReichhartingerH. RenL. Rodriguez-TemblequeC. RongxinA. SahaA. SarkarS. SatheeshbabuM. SaviA. SeçerR. SerbanM. ShamshuddinA. SharmaM. ShenJ. SieberA. SinhaA. SlobodaT. SugarY. SugawaraH. SugiyamaC. SultanW. SumelkaG. SunH. SunY. SunB. SzakszW. TaiR. TakeuchiP. TallapragadaJ. TangY. TangI. TarutaniA. TasoraP. TempelJ. TIANM. TrindadeA. Ture SavadkoohiM. TürkyilmazogluA. TussetA. VarelaV. VijayakumarC. VyasarayaniJ. WachlinF. WangG. WangL. WangZ. WangG. WeiS. WeiP. WengerY. WuZ. WuZ. XieS. XingY. XiongJ. XuH. YamashitaQ. YaoA. YigitS. YuY. YUEA. ZeleiZ. ZhangJ. ZhaoK. ZhouP. ZhouS. ZhouY. ZhouW. ZhuP. Ziegler","PeriodicalId":54858,"journal":{"name":"Journal of Computational and Nonlinear Dynamics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135633875","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