Journal of Computational and Nonlinear Dynamics最新文献_第9页

Numerical Simulation for Generalized Time-Fractional Burgers' Equation with Three Distinct Linearization Schemes 三种不同线性化格式下广义时间分数型Burgers方程的数值模拟

IF 2 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2023-02-08 DOI: 10.1115/1.4056857

Reetika Chawla, Komal Deswal, Devendra Kumar, D. Baleanu

引用次数: 2

Nonlinear Vibration of a Multi-Degree-of-Freedom Gear Transmission System with Multi-Piecewise Linear Functions 多分段线性函数多自由度齿轮传动系统的非线性振动

IF 2 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2023-02-07 DOI: 10.1115/1.4056850

Fulin Liao, Jianliang Huang, Weidong Zhu

{"title":"Nonlinear Vibration of a Multi-Degree-of-Freedom Gear Transmission System with Multi-Piecewise Linear Functions","authors":"Fulin Liao, Jianliang Huang, Weidong Zhu","doi":"10.1115/1.4056850","DOIUrl":"https://doi.org/10.1115/1.4056850","url":null,"abstract":"\u0000 Periodic and period-doubling vibrations in a gear transmission system subjected to forced excitations with multi-piecewise linear functions are investigated in this work by using the incremental harmonic balance (IHB) method. The nonlinear ordinary differential equations that govern vibration of the gear transmission system are formulated by employing the Newton's second law. Analytical results reveal abundant interesting phenomena, including jumps, bifurcations, softening-spring behaviors, and primary, super-harmonic, and sub-harmonic resonances, which have not been exhibited in existing investigations on nonlinear vibrations of gear transmission systems. Nonlinear phenomena and resonances of the gear transmission system are revealed by considering different numbers of degrees of freedom of the system. The bifurcations containing saddle-node, period-doubling, and Hopf bifurcations are observed in frequency response curves. The period-doubling phenomena are characterized with phase-plane diagrams and Fourier spectra. Further, analytical results obtained by the IHB method match very well with those from numerical integration.","PeriodicalId":54858,"journal":{"name":"Journal of Computational and Nonlinear Dynamics","volume":"BME-31 3","pages":""},"PeriodicalIF":2.0,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72604343","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 Real-Time Fluid Dynamic Air Brake Model for Long Heavy Haul Trains 长距离重载列车实时流体动力空气制动模型

IF 2 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2023-02-07 DOI: 10.1115/1.4056849

Qing Wu, Xiaohua Ge, E. Bernal, Peng-fei Liu

引用次数: 0

Wavelet-Based Methods to Partition Multibody Systems with Contact in Dynamic Simulation 动态仿真中含接触多体系统的小波分割方法

IF 2 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2023-02-07 DOI: 10.1115/1.4056848

Chantal L. Hutchison, J. Hewlett, J. Kovecses

{"title":"Wavelet-Based Methods to Partition Multibody Systems with Contact in Dynamic Simulation","authors":"Chantal L. Hutchison, J. Hewlett, J. Kovecses","doi":"10.1115/1.4056848","DOIUrl":"https://doi.org/10.1115/1.4056848","url":null,"abstract":"\u0000 The performance of physics simulation of multibody systems with contact can be enhanced by viewing the system as being composed of subsystems of bodies, and solving the dynamics of these subsystems in parallel. This approach to partition a system into subsystems, known as substructuring, is often based on topological information, such as the connectivity of a body in the system. However, substructuring based on topology may generate a potentially large number of equivalent decompositions, especially in highly symmetric systems, thus requiring a way to choose one partition over another. We propose that augmenting a topology-based partitioning scheme with dynamical information about the interactions between bodies may provide speedups by including temporal information about the constraint relationships between bodies. The simulation of multibody systems with contact typically exhibit non-stationary and multiscale interactions, which suggests a subsystem can be defined as a collection of bodies which have complex interactions with each other. We define complexity by introducing a novel metric based on the spread of time scales from a wavelet analysis of constraints between bodies. We show that for systems where purely topological information about the interaction between bodies is redundant, including dynamical information not only removes redundancy, but also can achieve significant computational speedups. Our results highlight the versatility of using dynamical information to look at large-scale structure in multibody simulations.","PeriodicalId":54858,"journal":{"name":"Journal of Computational and Nonlinear Dynamics","volume":"43 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72829449","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

Novel Kinematics of an Anthropomorphic Prosthetic Hand Allowing Lateral and Opposite Grasp with a Single Actuator 一种拟人假手的新运动学，允许用单个驱动器进行横向和反向抓取

IF 2 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2023-02-07 DOI: 10.1115/1.4056852

Côme Butin, D. Chablat, Y. Aoustin, David Gouallier

引用次数: 2

Vibration Analysis of a Nonlinear Absorber Coupled to a Hand-Held Impact Machine 与手持式冲击机耦合的非线性减振器振动分析

IF 2 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2023-01-31 DOI: 10.1115/1.4056803

Oreoluwa Alabi, S. K. Gupta, O. Barry

{"title":"Vibration Analysis of a Nonlinear Absorber Coupled to a Hand-Held Impact Machine","authors":"Oreoluwa Alabi, S. K. Gupta, O. Barry","doi":"10.1115/1.4056803","DOIUrl":"https://doi.org/10.1115/1.4056803","url":null,"abstract":"\u0000 Exposure of human hands to harmful levels of vibration can lead to severe injuries. To attenuate these Hand Transmitted Vibrations, a Nonlinear Vibration Absorber Inerter (NVAI) is proposed in this work. The proposed NVAI is attached to a coupled nonlinear system of a Hand-held Impact Machine and a Hand-Arm System. The combined coupled nonlinear system is modeled as a lumped parameter model with a combination of cubic and linear stiffness components, linear viscous dampers, and lumped masses. The governing equations of motion are solved analytically using the method of harmonic balance and validated using numerical simulations. A numerical bifurcation diagram of the system reveals the existence of complex solutions such as quasi-periodic and chaotic attractors. The appearances of quasi-periodic and chaotic attractors are later confirmed by Lyapunov exponents. Further, we explore the ability of the proposed NVAI to decrease the area corresponding to unstable quasi-periodic and chaotic motion in the excitation amplitude-frequency space. This observation further implies the delay in the onset of quasi-periodic and chaotic motion for a range of forcing amplitude using Lyapunov exponents. Finally, parametric analyses are carried out to identify the critical design parameters of the NVAI. These analyses reveal that an increase in the damping, mass, and inertance of the absorber ameliorates the performance of the NVAI. Furthermore, the critical value of the external excitation, corresponding to a sudden change in the response of the system, can be controlled using an appropriate selection of absorber parameters.","PeriodicalId":54858,"journal":{"name":"Journal of Computational and Nonlinear Dynamics","volume":"3 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78279108","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

Machine Learning Non-Reciprocity of a Linear Waveguide With a Local Nonlinear, Asymmetric Gate: Case of Strong Coupling 具有局部非线性非对称门的线性波导的机器学习非互易性:强耦合的情况

4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2023-01-19 DOI: 10.1115/1.4056587

Chongan Wang, Alireza Mojahed, Sameh Tawfick, Alexander F. Vakakis

{"title":"Machine Learning Non-Reciprocity of a Linear Waveguide With a Local Nonlinear, Asymmetric Gate: Case of Strong Coupling","authors":"Chongan Wang, Alireza Mojahed, Sameh Tawfick, Alexander F. Vakakis","doi":"10.1115/1.4056587","DOIUrl":"https://doi.org/10.1115/1.4056587","url":null,"abstract":"Abstract We study nonreciprocity in a passive linear waveguide augmented with a local asymmetric, dissipative, and strongly nonlinear gate. Strong coupling between the constituent oscillators of the waveguide is assumed, resulting in broadband capacity for wave transmission. The local nonlinearity and asymmetry at the gate can yield strong global nonreciprocal acoustics, in the sense of drastically different acoustical responses depending on which side of the waveguide a harmonic excitation is applied. Two types of highly nonreciprocal responses are observed: (i) Monochromatic responses without frequency distortion compared to the applied harmonic excitation, and (ii) strongly modulated responses (SMRs) with strong frequency distortion. The complexification averaging (CX-A) method is applied to analytically predict the monochromatic solutions of this strongly nonlinear problem, and a stability analysis is performed to study the governing bifurcations. In addition, we build a machine learning framework where neural net (NN) simulators are trained to predict the performance measures of the gated waveguide in terms of certain transmissibility and nonreciprocity measures. The NN drastically reduces the required simulation time, enabling the determination of parameter ranges for desired performance in a high-dimensional parameter space. In the predicted desirable parameter space for nonreciprocity, the maximum transmissibility reaches 40%, and the transmitted energy varies by up to three orders of magnitude depending on the direction of wave transmission. The machine learning tools along with the analytical methods of this work can inform predictive designs of practical nonreciprocal waveguides and acoustic metamaterials that incorporate local nonlinear gates.","PeriodicalId":54858,"journal":{"name":"Journal of Computational and Nonlinear Dynamics","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135251565","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

Mechanical Design, Planning, and Control for Legged Robots in Distillation Columns 精馏塔腿式机器人的机械设计、规划和控制

IF 2 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2023-01-11 DOI: 10.1115/1.4056659

T. Molnár, Katherine Tighe, Wyatt Ubellacker, A. Kalantari, A. Ames

引用次数: 0

Erratum: “Global Dynamics and Bifurcation Analysis for the Peristaltic Transport Through Nonuniform Channels” (ASME J. Comput. Nonlinear Dynam., 2022, 17(6), p. 061001) 勘误:“通过非均匀通道的蠕动输运的整体动力学和分岔分析”(ASME J. Comput)。非线性力学。， 2022, 17(6)， p. 061001)

IF 2 4区工程技术

Journal of Computational and Nonlinear Dynamics Pub Date : 2023-01-11 DOI: 10.1115/1.4056592

H. A. Hosham, N. M. Hafez

引用次数: 0

Delay Effects in the Dynamics of Human Controlled Towing of Vehicles 人控车辆牵引动力学中的延迟效应