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国际机械系统动力学学报(英文)最新文献

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The first International Conference on Mechanical System Dynamics grandly convened in Nanjing, China 首届机械系统动力学国际会议在中国南京隆重召开
Pub Date : 2022-10-18 DOI: 10.1002/msd2.12054
Tong Zhang, Qinbo Zhou, Yanni Zhang

The first International Conference on Mechanical System Dynamics (ICMSD), a major international conference in the field of mechanical system dynamics, was held as a hybrid in-person/virtual conference during the period August 24–27, 2022, in Nanjing, China, an ancient major cultural city. More than 2000 scientists and engineering experts from more than 20 countries in Asia, Europe, America, Africa, and Oceania, including 29 members of the National Academy of Sciences/Engineering, 13 presidents of international academic societies, and 15 Editors-in-Chief of international journals, attended the conference, as shown in Figures 1 and 2. Focusing on the theme of “Promoting Science, Technology and Industry by Mechanical System Dynamics,” the conference defines a new chapter in the development of the field of mechanical system dynamics.

The standing ICMSD is jointly initiated and organized by well-recognized researchers from more than 20 leading universities in more than 10 countries, including the Nanjing University of Science and Technology, Aarhus University, Beijing Institute of Technology, Harbin Institute of Technology, LUT University, McGill University, Nanjing University of Aeronautics and Astronautics, Nanyang Technological University, Northwestern Polytechnical University, Peking University, Politecnico di Milano, Shijiazhuang Tiedao University, Swansea University, the Hong Kong University of Science and Technology, the State University of New York, Korea (SUNY Korea), Tsinghua University, University of Aberdeen, University of Siegen, University of Wollongong, and Wuhan University. The conference is held every 2 years in different countries in rotation. The Standing Steering Committee (see Appendix A) of ICMSD now consists of 35 international experts, including 15 members of the National Academy of Sciences/Engineering, 14 presidents of international academic societies, and 14 Editors-in-Chief of international journals. They oversee the ICMSD planning and development. Prof. Xiaoting Rui from the Nanjing University of Science and Technology, a member of the Chinese Academy of Sciences, is the ICMSD Chairman. Profs. Marco Amabili from McGill University, a fellow of the Canadian Academy of Engineering; Seung-Bok Choi from the State University of New York, Korea, a fellow of the Korea Science and Technology Academy; Yonggang Huang from Northwestern University, a member of the National Academy of Engineering/Sciences, USA; Aki Mikkola from the LUT University, the Chair of the International Federation for the Promotion of Mechanism and Machine Science, IFToMM Finland; Tianshou Zhao from the Hong Kong University of Science and Technology, a member of Chinese Academy of Sciences, are the ICMSD Vice Chairmen. The first ICMSD was hosted by the Nanjing University of Science and Technology, the Chinese Society of Theoretical and Applied Mechanics, the International Association of Applied Mechanics, the John Wiley & Sons Inc., and the Inter

朱先生是加拿大约克大学工程院院士,在“基于有限元方法和状态估计器的柔性系绳系统计算控制”的报告中,他讨论了提出的有限元状态观测器来估计沿系绳长度的离散状态和模型预测控制来控制空间碎片清除电动系绳的几何轮廓。美国爱荷华大学的谢里夫·拉赫曼教授发表了题为“用正交样条展开法量化线性动力系统中的不确定性”的演讲,讨论了用样条混沌展开和样条维数分解来解决线性结构动力学中的不确定性量化问题。来自芬兰LUT大学的Aki Mikkola教授介绍了“产品生命周期中的多体系统动力学”,并讨论了多体系统动力学在产品生命周期中的潜在作用,其形式为(i)基于游戏化的产品开发,(ii)结合现实数据和无处不在的通信网络支持的模拟的预防性维护新概念,(iii)自主机械,(四)应用人工智能对制造业进行自适应优化。来自德国锡根大学的欧洲科学院院士张传增教授在题为“自适应超材料的振动和弹性波抑制”的报告中,针对可调谐超材料在振动和弹性波抑制中的频带隙带宽较窄的问题,提出了基于粒子群优化技术指导下的主动自适应控制策略的自适应超材料。来自英国阿伯丁大学的爱丁堡皇家学会院士Marian Wiercigroch教授做了题为“校准非光滑动力学中的低维模型”的演讲,讨论了非光滑和非线性系统的动力学,低维动力系统的有效建模和分析,以及工程设计中的非线性动力学。来自华中科技大学的中国科学院院士丁涵教授以“成像技术在切削过程中的切屑形成动力学”为题,总结了切削过程中成像技术的发展现状,重点介绍了成像技术的工作原理和采用的设备,以及在切屑形成过程和表面完整性研究中的应用。以上报告总结了机械系统动力学的最新进展,代表了该领域的理论和应用前沿,并重点介绍了机械系统动力学在软件开发、优化设计、诊断与控制、测量与测试以及工程应用等方面的未来发展方向。参加者共作了206次口头报告和109次海报报告,如图24-26所示。8月25日晚,ICMSD组委会在中国南京香格里拉大酒店盛世大厅举办了晚宴。ICMSD常务指导委员会主席、ICMSD主席、中国科学院院士、ICMSD常务指导委员会主席芮晓廷教授代表ICMSD常务指导委员会向与会嘉宾表示最热烈的欢迎。随后,南京理工大学艺术与文化教育系师生进行了歌舞表演《我们都是追梦人》和二胡合奏《战马奔腾》。南京理工大学校董会主席张军教授代表首届ICMSD组委会为中国船舶科学研究中心和内蒙古北方重工集团有限公司颁发了重大贡献奖。中国船舶科学研究中心副主任吴文伟先生和内蒙古北方重工集团有限公司部长吴宝军先生作为获奖者代表接受了重大贡献奖。南京理工大学校董会副主席廖文和教授代表ICMSD主办方之一的南京理工大学致祝酒辞,如图27-31所示。8月27日晚,IJMSD编辑委员会会议、ICMSD常务指导委员会会议、ISMSD筹备委员会会议现场和在线同步举行。张传增教授主持了三次会议。在IJMSD编辑委员会会议上,IJMSD总编辑芮晓婷教授对编委会成员表示欢迎。Assoc。IJMSD执行主编张旭平教授报告了IJMSD的最新进展。 来自11个国家的49位专家,包括8位美国国家科学院院士、9位国际学术学会主席、8位国际期刊主编,围绕“吸引高质量论文,提高期刊科学影响力”这一主题,对期刊问题、国际投稿来源、同行评议质量、及时出版、期刊推广等进行了讨论,如图32和33所示。在ICMSD常务指导委员会会议上,ICMSD常务指导委员会主席、ICMSD主席芮晓婷教授发言并宣布了ICMSD下一届主办机构。Assoc。第一届ICMSD秘书长周钦波教授介绍了第一届ICMSD的数据和统计。Assoc。北京大学的王雪峰教授代表下一届会议的东道主,介绍了当地的安排和设施。来自6个国家的29位专家,包括7位国家科学院院士、5位国际学术学会主席、8位国际期刊主编,对第一次会议的成功表示赞赏,并表示相信在北京大学举行的第二次会议也会取得成功,如图34和35所示。在ISMSD筹委会会议上,ISMSD筹委会主席芮晓婷教授热情地向与会者致辞。ISMSD筹委会委员薛锐教授就ISMSD筹委会筹备工作作了报告,详细阐述了ISMSD成立的宗旨、依据、目标和未来计划。国际机械系统动力学学会筹备委员会正式成立。该委员会由来自亚洲、欧洲、美洲、非洲和大洋洲五大洲20多个国家的100多名知名科学家组成。11位国家科学院院士、10位国际学会主席、9位国际期刊主编等11个国家的44位专家见证了委员会的成立,如图36-38所示。8月27日,中国科学院院士、ICMSD常务指导委员会委员郭万林教授主持了首届ICMSD闭幕式。大会组委会授予最佳论文奖和组委会特别贡献奖;如图39-41所示。最后一天,ICMSD主席、中国科学院院士芮晓婷教授作了闭幕致辞。他代表IJMSD编辑委员会宣布,决定选出18名有才华的青年研究人员担任IJMSD青年科学家编辑委员会成员。他代表ICMSD常务指导委员会宣布选择北京大学作为第二届ICMSD主办院校,刘才山教授担任地方主席,会议将于2023年9月1日至5日在北京举行。芮教授代表ISMSD筹委会宣布ISMSD正式成立。ISMSD筹委会由来自五大洲20多个国家50多所高校和世界500强企业的100多名知名科学家组成,其中包括40多名国家科学院/工程院院士。在此期间,刘彩山教授介绍了第二届ICMSD的筹备情况,并播放了一段视频,向观众介绍下一届会议的情况,如图42-44所示。芮主席在闭幕词中表示,首届ICMSD取得了巨大成功。大批顶尖科学家和工程专家参加了此次活动。本次会议将展示一系列先进的科研成果,这些成果将极大地促进科学、技术和产业的发展,展示ICMSD作为一个新的国际学术交流平台的作用。
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引用次数: 0
Nominal geometry and force measures for solids and fluids 固体和流体的标称几何和力测量
Pub Date : 2022-10-01 DOI: 10.1002/msd2.12052
Ahmed A. Shabana

Understanding solid- and fluid-inertia forces and their coupling with the gravity potential in complex motion scenarios is necessary for evaluating system stability and identifying root causes of system failure and accidents. Because solids and fluids have an infinite number of degrees of freedom and distributed inertia and elasticity, having meaningful qualitative and quantitative nominal measures of the kinematics and forces will contribute to a better understanding of the system dynamics. This paper proposes developing new continuum-based nominal measures for the characterization of the oscillations and forces. By using a material-point approach, these new nominal measures, which have their roots in the continuum-mechanics partial-differential equations of equilibrium and Frenet geometry, are independent of the formulation or generalized coordinates used to develop the dynamic equations of motion. The paper proposes a data-driven-science approach to define a nominal continuum space-curve geometry with nominal curvature and torsion; a nominal instantaneous motion plane (IMP), which contains the resultant of all forces including the inertia forces; and a nominal instantaneous zero-force axis (IZFA) along which the resultant of all forces vanishes. While using the material-point approach eliminates the need for introducing moment equations associated with orientation coordinates, the IMP and IZFA concepts can be used to define the instantaneous axis of significant moment components, which can lead to accidents such as in the case of vehicle rollovers.

了解复杂运动场景中固体和流体惯性力及其与重力势的耦合对于评估系统稳定性和识别系统故障和事故的根本原因是必要的。由于固体和流体具有无限的自由度和分布的惯性和弹性,因此对运动学和力进行有意义的定性和定量标称测量将有助于更好地理解系统动力学。本文提出发展新的基于连续体的标称测量来表征振动和力。通过使用物质点方法,这些新的标称测度,其根源在于连续力学的平衡偏微分方程和弗莱内几何,独立于用于发展运动动力学方程的公式或广义坐标。本文提出了一种数据驱动科学方法来定义具有名义曲率和名义扭转的名义连续空间曲线几何;一个名义瞬时运动平面(IMP),它包含包括惯性力在内的所有力的合力;以及一个名义上的瞬时零力轴(IZFA),沿着它所有力的合力都消失了。虽然使用材料点方法消除了引入与方向坐标相关的力矩方程的需要,但IMP和IZFA概念可用于定义重要力矩组件的瞬时轴,这可能导致车辆侧翻等事故。
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引用次数: 0
Adaptive control for reliable cooperative intersection crossing of connected autonomous vehicles 网联自动驾驶车辆可靠协同过路口的自适应控制
Pub Date : 2022-09-30 DOI: 10.1002/msd2.12050
Yu Wei, Xiaozheng (Sean) He

Rapid advances in vehicle automation and communication technologies enable connected autonomous vehicles (CAVs) to cross intersections cooperatively, which could significantly improve traffic throughput and safety at intersections. Virtual platooning, designed upon car-following behavior, is one of the promising control methods to promote cooperative intersection crossing of CAVs. Nevertheless, demand variation raises safety and stability concerns when CAVs adopt a virtual platooning control approach. Along this line, this study proposes an adaptive vehicle control method to facilitate the formation of a virtual platoon and the cooperative crossing of CAVs, factoring demand variations at an isolated intersection. This study derives the stability conditions of virtual CAV platoons depending on the time-varying traffic demand. Based on the derived stability conditions, an optimization model is proposed to adaptively control CAVs dynamics by balancing approaching traffic mobility and safety to enhance the reliability of cooperative crossing at intersections. The simulation results show that, compared to the nonadaptive control, our proposed method can increase the intersection throughput by 18.2%. Also, time-to-collision results highlight the advantages of the proposed adaptive control in securing traffic safety.

车辆自动化和通信技术的快速发展使联网自动驾驶汽车(cav)能够协同穿过十字路口,这可以显着提高十字路口的交通吞吐量和安全性。基于车辆跟随行为设计的虚拟队列是促进自动驾驶汽车协同过路口的一种很有前途的控制方法。然而,当自动驾驶汽车采用虚拟队列控制方法时,需求变化引发了安全性和稳定性问题。在此基础上,本研究提出了一种考虑孤立交叉口需求变化的自适应车辆控制方法,以促进虚拟队列的形成和自动驾驶汽车的协同穿越。本文导出了随时变交通需求变化的虚拟CAV队列的稳定性条件。基于导出的稳定性条件,提出了一种平衡接近交通机动性和安全性的自动驾驶汽车动态自适应控制优化模型,以提高交叉口协同通行的可靠性。仿真结果表明,与非自适应控制相比,该方法可使交叉口吞吐量提高18.2%。同时,碰撞时间结果也突出了自适应控制在保障交通安全方面的优势。
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引用次数: 0
Numerical investigation of mass transfer behavior of a gas–liquid two-phase Taylor flow in a microchannel by a volume-of-fluid multiphase flow system 微通道内气液两相Taylor流传质行为的体积-流体多相流系统数值研究
Pub Date : 2022-09-28 DOI: 10.1002/msd2.12049
Qiuwen Zhong, Zhen Jiao, Wenhui Nie, Yan Li, Ning Gu

The microchannel reactor is the most commonly used microreaction technology, an innovative reaction system developed in recent years. This study investigates the mass transfer behavior of a gas–liquid two-phase Taylor flow in a microchannel by coupling the volume-of-fluid model and the species transport model. The concentration distribution and the volumetric mass transfer coefficient of the gas solute are determined and discussed in detail. The simulation results reveal that the double-circulation flow influences the concentration distribution in the liquid slug. The highest value is observed at the bubble's surface and decreases rapidly along the vertical direction of the bubble. The increase of bubble velocity leads to a more apparent decreasing trend. The gas–liquid interface renewal rate of the bubble is accelerated with increasing bubble velocity, resulting in an increase in the average mass transfer rate in all regions of the bubble surface with an increase in bubble velocity. The results also indicate that the liquid film area contributes the most to the mass transfer behavior due to the most significant proportion and average mass transfer rate of the liquid film among the bubble.

微通道反应器是近年来发展起来的一种创新的微反应系统,是目前最常用的微反应技术。本文通过耦合流体体积模型和物质输运模型,研究了微通道中气液两相泰勒流的传质行为。测定并详细讨论了气体溶质的浓度分布和体积传质系数。仿真结果表明,双循环流动影响了液段塞内的浓度分布。在气泡表面观察到最高值,并沿着气泡的垂直方向迅速下降。气泡速度的增加导致了更明显的下降趋势。气泡的气液界面更新速率随着气泡速度的增加而加快,导致气泡表面各区域的平均传质速率随着气泡速度的增加而增加。结果还表明,液膜面积对气泡传质行为的影响最大,因为液膜在气泡中的传质比例和平均传质速率都最大。
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引用次数: 1
Eigenvalue analysis of planar linear multibody system under conservative force based on the transfer matrix method 基于传递矩阵法的平面线性多体系统在保守力作用下的特征值分析
Pub Date : 2022-09-13 DOI: 10.1002/msd2.12048
Jinghong Wang, Xiaoting Rui, Xun Wang, Jianshu Zhang, Qinbo Zhou, Junjie Gu

The linear multibody system transfer matrix method (LMSTMM) provides a powerful tool for analyzing the vibration characteristics of a mechanical system. However, the original LMSTMM cannot resolve the eigenvalues of the systems with ideal hinges (i.e., revolute hinge, sliding hinge, spherical hinge, cylindrical hinge, etc.) or bodies under conservative forces due to the lack of the corresponding transfer matrices. This paper enables the LMSTMM to solve the eigenvalues of the planar multibody systems with ideal hinges or rigid bodies under conservative forces. For a rigid body, the transfer matrix can now consider coupling terms between forces and kinematic state perturbations. Also, conservative forces that contribute to the eigenvalues can be considered. Meanwhile, ideal hinges are introduced to LMSTMM, which enables the treatment of eigenvalues of general multibody systems using LMSTMM. Finally, the comparative analysis with ADAMS software and analytical solutions verifies the effectiveness of the proposed approach in this paper.

线性多体系统传递矩阵法为分析机械系统的振动特性提供了有力的工具。然而,由于缺乏相应的传递矩阵,原始LMSTMM无法求解具有理想铰链(即旋转铰链、滑动铰链、球面铰链、圆柱铰链等)或物体在保守力下的系统的特征值。本文使LMSTMM能够求解具有理想铰链或刚体的平面多体系统在保守力作用下的特征值。对于刚体,传递矩阵现在可以考虑力和运动状态扰动之间的耦合项。此外,可以考虑对本征值有贡献的保守力。同时,在LMSTMM中引入了理想铰链,使LMSTMM能够处理一般多体系统的特征值。最后,通过与ADAMS软件的对比分析和解析解验证了本文方法的有效性。
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引用次数: 0
Core/shell magnetite/copolymer composite nanoparticles enabling highly stable magnetorheological response 核/壳磁铁矿/共聚物复合纳米粒子实现高度稳定的磁流变响应
Pub Date : 2022-07-22 DOI: 10.1002/msd2.12047
Wenjiao Han, Shun Wang, Xiaoting Rui, Yuzhen Dong, Hyoungjin Choi

Magnetorheological fluids (MRFs) have been successfully used in a variety of smart control systems, but are still limited due to their relatively poor settling stability. Herein, a core/shell-structured Fe3O4/copolymer composite nanoparticle is synthesized as a new candidate material for stimulus-responsive MRFs to tackle the limitation of the long-term dispersion stability. Aniline-co-diphenylamine copolymers (PANI-co-PDPA) are loaded onto the surface of Fe3O4 nanoparticles, providing a lighter density and sufficient active interface for the dispersion of magnetic particles in the carrier medium. The features of the Fe3O4/copolymer composite nanoparticles, including morphology, compositional, and crystalline properties, are characterized. An MRF is prepared by suspending Fe3O4/copolymer composite nanoparticles in a nonmagnetic medium oil, and its rheological properties are assessed using a controlled shear rate test and dynamic oscillation tests using a rotational rheometer. Rheological models including the Bingham model and the Herschel–Bulkley model are fitted to the flow curves of the MRF. The obtained Fe3O4/copolymer composite shows soft-magnetic properties, as well as greater density adaptability and higher stability, compared to Fe3O4. Moreover, the sedimentation testing provides information about the dispersion stability characteristics of MRF and shows a good correlation with high-stability magnetorheological (MR) response. The Fe3O4/copolymer-based MRF with a tunable and instantaneous MR response is considered a promising material for smart control applications.

磁流变液(mrf)已经成功地应用于各种智能控制系统中,但由于其相对较差的沉降稳定性,仍然受到限制。本文合成了一种核/壳结构的Fe3O4/共聚物复合纳米颗粒,作为刺激响应型MRFs的新候选材料,解决了长期分散稳定性的限制。苯胺-共二苯胺共聚物(PANI-co-PDPA)被加载到Fe3O4纳米颗粒表面,为磁性颗粒在载体介质中的分散提供了更轻的密度和足够的活性界面。表征了Fe3O4/共聚物复合纳米颗粒的形貌、组成和结晶性质。将Fe3O4/共聚物复合纳米颗粒悬浮在非磁性介质油中制备MRF,并通过可控剪切速率测试和旋转流变仪的动态振荡测试来评估其流变特性。用Bingham模型和Herschel-Bulkley模型拟合了磁流变液的流动曲线。与Fe3O4相比,制备的Fe3O4/共聚物复合材料具有较好的软磁性能、较好的密度适应性和较高的稳定性。此外,沉降试验提供了磁流变液弥散稳定性特性的信息,并显示出与高稳定性磁流变(MR)响应的良好相关性。基于Fe3O4/共聚物的MRF具有可调谐和瞬时的MR响应,被认为是智能控制应用的有前途的材料。
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引用次数: 2
System dynamics in structural strength and vibration fatigue life assessment of the swing bar for high-speed maglev train 高速磁悬浮列车摆杆结构强度及振动疲劳寿命评估中的系统动力学
Pub Date : 2022-07-21 DOI: 10.1002/msd2.12045
Feng Guo, Feifei Hu, Shengchuan Wu, Feng He, Jianxin Liu, Xingwen Wu

High-speed maglev trains are subjected to severe dynamic loads, thus posing a failure hazard. It is necessary to account for the vehicle dynamics to improve the structural strength and fatigue life assessment approach under harsh routes and super high-speed grades. As the most critical load-carrying part between the vehicle body and levitation frames, the swing bar was taken as an example to demonstrate the significance of vehicle dynamics to integrate classical structural strength and fatigue life with the service conditions. A multiphysics-coupled dynamic model of an alpha improvement scheme for an electromagnetic suspension maglev train capable of 600 km/h was established to investigate the complex dynamic loads and fatigue spectra. Using this model, the structural strength and fatigue life of the wrought swing bars were investigated. Results show only a slight effect on the structural strength and fatigue life of swing bars by the super high-speed grades. The nonaxial bending moments caused by the uncompensated relative displacement between the vehicle body and bolsters are identified as the decisive factors. The minimum safety factor of the structural strength for wrought swing bars is 1.33, while the minimum fatigue life is 34 years. Both match the design requirements but are not conservative enough. Therefore, further verification and optimization are recommended to improve the design of swing bars.

高速磁悬浮列车承受着剧烈的动载荷,存在着故障隐患。为了改进恶劣路线和超高速等级下的结构强度和疲劳寿命评估方法,有必要考虑车辆动力学因素。摆杆作为车身与悬浮架之间最关键的承载部件,以摆杆为例,说明了车辆动力学将经典结构强度、疲劳寿命与使用条件相结合的意义。建立了600 km/h电磁悬浮磁悬浮列车alpha改进方案的多物理场耦合动力学模型,研究了列车的复杂动载荷和疲劳谱。利用该模型对变形摆杆的结构强度和疲劳寿命进行了研究。结果表明,超高速等级对摆杆的结构强度和疲劳寿命影响不大。确定了车体与支撑体之间未补偿的相对位移引起的非轴向弯矩是决定因素。变形摆杆结构强度的最小安全系数为1.33,最小疲劳寿命为34年。两者都符合设计要求,但都不够保守。因此,建议进一步验证和优化,以改进摆杆的设计。
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引用次数: 1
Parameter influence law analysis and optimal design of a dual mass flywheel 双质量飞轮参数影响规律分析及优化设计
Pub Date : 2022-07-20 DOI: 10.1002/msd2.12046
Guangqiang Wu, Guoqiang Zhao

The influence of the dynamic parameters of a dual mass flywheel (DMF) on its vibration reduction performance is analyzed, and several optimization algorithms are used to carry out multiobjective DMF optimization design. First, the vehicle powertrain system is modeled according to the parameter configuration of the test vehicle. The accuracy of the model is verified by comparing the simulation data with the test results. Then, the model is used to analyze the influence of the moment of inertia ratio, torsional stiffness, and damping in reducing DMF vibration. The speed fluctuation amplitude at the transmission input shaft and the natural frequency of the vehicle are taken as the optimization objectives. The passive selection method, multiobjective particle swarm optimization, and the nondominated sorting genetic algorithm based on an elite strategy are used to carry out DMF multiobjective optimization design. The advantages and disadvantages of these algorithms are evaluated, and the best optimization algorithm is selected.

分析了双质量飞轮(DMF)动力学参数对其减振性能的影响,并采用几种优化算法进行了多目标DMF优化设计。首先,根据试验车辆的参数配置,对整车动力总成系统进行建模。通过仿真数据与试验结果的对比,验证了模型的准确性。然后,利用该模型分析了转动惯量比、扭转刚度和阻尼对DMF减振的影响。以变速器输入轴处的速度波动幅值和车辆固有频率为优化目标。采用被动选择法、多目标粒子群算法和基于精英策略的非支配排序遗传算法进行DMF多目标优化设计。对这些算法的优缺点进行了评价,并选择了最佳的优化算法。
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引用次数: 8
Dynamical analysis of an SDOF quasi-linear system with jump noises and multitime-delayed feedback forces 具有跳变噪声和多时滞反馈力的SDOF拟线性系统动力学分析
Pub Date : 2022-07-13 DOI: 10.1002/msd2.12043
Wantao Jia, Mingxia Luo, Mengli Hao, Yong Xu
In this paper, stochastic dynamics of a single degree‐of‐freedom quasi‐linear system with multitime delays and Poisson white noises are investigated using an approximate procedure based on the stochastic averaging method. The simplified equations, including the averaged stochastic differential equation and the averaged generalized Fokker–Planck–Kolmogorov equation, are obtained to calculate the probability density functions (PDFs) to explore stationary responses. The expression of the Lyapunov exponent is presented to examine the asymptotic stochastic Lyapunov stability. An illustrative example of a quasi‐linear oscillator with two Poisson white noises controlled by two time‐delayed feedback forces is worked out to demonstrate the validity of the proposed method. The approximate stationary PDFs of stochastic responses and asymptotic stochastic stability are demonstrated numerically and theoretically. The results show that the Gaussian white noise has a stronger influence on the dynamics than the Poisson white noise with a small mean arrival rate. Moreover, the influence of the time delay and noise parameters on stochastic dynamics is investigated. It is found that the PDFs under the Poisson white noise approach those under Gaussian white noise as the mean arrival rate increases. The time delay can induce stochastic P‐bifurcation of the system. It is also found that the increase of time delay and the mean arrival rates of the Poisson white noises will broaden the unstable parameter region. The comparison between numerical and theoretical results shows the effectiveness of the proposed method.
本文采用基于随机平均法的近似过程,研究了具有多时滞和泊松白噪声的单自由度拟线性系统的随机动力学问题。得到了简化方程,包括平均随机微分方程和平均广义Fokker-Planck-Kolmogorov方程,用于计算概率密度函数(PDFs)以探索平稳响应。给出了Lyapunov指数的表达式,用以检验渐近随机Lyapunov稳定性。最后以两个时滞反馈力控制两个泊松白噪声的准线性振荡器为例,验证了所提方法的有效性。从数值和理论上证明了随机响应的近似平稳PDFs和渐近随机稳定性。结果表明,高斯白噪声比平均到达率较小的泊松白噪声对动力学的影响更大。此外,还研究了时滞和噪声参数对随机动力学的影响。随着平均到达率的增加,泊松白噪声下的pdf接近高斯白噪声下的pdf。时滞会引起系统的随机p分岔。研究还发现,延时和泊松白噪声平均到达率的增加会使不稳定参数区域变宽。数值结果与理论结果的比较表明了所提方法的有效性。
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引用次数: 1
Dynamic modeling and analysis of the looped space tether transportation system based on ANCF 基于蚁群函数的环形空间系绳运输系统动力学建模与分析
Pub Date : 2022-07-03 DOI: 10.1002/msd2.12044
Jie Yang, Qingtao Wang, Zhiyong Zhang, Zhendong Liu, Shidong Xu, Gangqiang Li

A high-fidelity multibody-system dynamic model of the looped tether transportation system (L-TTS) is proposed in this study to study its large deformation as well as large overall motion. The absolute nodal coordinate formulation (ANCF)-based gradient-deficient beam element is employed to establish the accurate model of the two flexible tethers subject to large deformations. The relative movement of climbers along tethers is described by using the sliding joint model based on ANCF. To reduce the collision risks between tethers and climbers, two libration suppression strategies, namely, the decelerated motion of climbers relative to tethers and multiple climbers per tether are investigated in this study. Several numerical simulations not only validate the effectiveness of the two strategies in reducing the collision risks between climbers and tethers, the overall librations of L-TTS, and the magnitudes of the longitudinal elastic force of tethers, but also verify the good performance of the high-fidelity model proposed in this study for dynamic simulation of the L-TTS in microgravity conditions.

针对环系绳运输系统的大变形和大整体运动,建立了环系绳运输系统的高保真多体系统动力学模型。采用基于绝对节点坐标公式(ANCF)的梯度亏缺梁单元,建立了两根大变形柔性系索的精确模型。利用基于蚁群函数的滑动节点模型描述了攀爬者沿锚索的相对运动。为了降低绳索与攀爬者碰撞的风险,本研究研究了两种抑制振动的策略,即攀爬者相对于绳索的减速运动和攀爬者对绳索的多重运动。数值模拟不仅验证了两种策略在降低攀登者与系绳碰撞风险、L-TTS整体振动和系绳纵向弹性力大小方面的有效性,而且验证了本研究提出的高保真度模型在微重力条件下L-TTS动态仿真中的良好性能。
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引用次数: 0
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国际机械系统动力学学报(英文)
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