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dynamics modeling of the liquid-filled pipe system by coupling the incompatible solid and virtual beam elements

MECHANICS OF ADVANCED MATERIALS AND STRUCTURES 2025年

作者： Shi, Yan Lv, Shang Sun, Wei Guo, Yingqing Northwestern Polytech Univ Natl Elite Inst Engn Xian Peoples R China Shenyang Liming Aeroengine CO LTD AECC Shenyang Peoples R China Northeastern Univ Sch Mech Engn & Automat Shenyang Peoples R China Northeastern Univ Dept Educ China Key Lab Vibrat & Control Aeroprop Syst Shenyang 110819 Peoples R China Northwestern Polytech Univ Sch Power & Energy Xian Peoples R China

Accurate stress response calculation of liquid-filled pipe systems (LFPS) is crucial for reliability analysis and design. Existing methods face challenges with complex LFPS. This study develops incompatible solid (Solid-NC) and virtual beam (VBeam) elements for finite element modeling of solid and fluid domains, coupled via a specialized element. To address non-classical damping from fluid-structure interaction (FSI), virtual force iteration and stress smoothing in the frequency domain are applied. Experimental validation confirms the model's accuracy. Results reveal non-monotonic stress responses to fluid velocity and pressure (FVAP), with critical stress barriers and valleys causing sharp changes in stress amplitude.

关键词： dynamics modeling liquid-filled pipe system incompatible solid element virtual beam element stress response

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dynamics modeling and optimal control for multi-information diffusion in Social Internet of Things

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Digital Communications and Networks 2024年第3期10卷 655-665页

作者： Yaguang Lin Xiaoming Wang Liang Wang Pengfei Wan School of Computer Science Shaanxi Normal UniversityXi'an710119China

As an ingenious convergence between the Internet of Things and social networks,the Social Internet of Things(SIoT)can provide effective and intelligent information services and has become one of the main platforms for people to spread and share ***,SIoT is characterized by high openness and autonomy,multiple kinds of information can spread rapidly,freely and cooperatively in SIoT,which makes it challenging to accurately reveal the characteristics of the information diffusion process and effectively control its *** this end,with the aim of exploring multi-information cooperative diffusion processes in SIoT,we first develop a dynamics model for multi-information cooperative diffusion based on the system dynamics theory in this ***,the characteristics and laws of the dynamical evolution process of multi-information cooperative diffusion are theoretically investigated,and the diffusion trend is *** this basis,to further control the multi-information cooperative diffusion process efficiently,we propose two control strategies for information diffusion with control objectives,develop an optimal control system for the multi-information cooperative diffusion process,and propose the corresponding optimal control *** optimal solution distribution of the control strategy satisfying the control system constraints and the control budget constraints is solved using the optimal control ***,extensive simulation experiments based on real dataset from Twitter validate the correctness and effectiveness of the proposed model,strategy and method.

关键词： Social Internet of Things Information diffusion dynamics modeling Trend prediction Optimal control

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dynamics modeling of Spalling Failure at the Non-Central Position of the Raceway for an Inner Ring of a Ball Bearing

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APPLIED SCIENCES-BASEL 2025年第5期15卷 2740-2740页

作者： Li, Sihui Wang, Linghang Meng, Weiying Wang, Jiaying Gong, Zhiheng Shenyang Jianzhu Univ Sch Sci Shenyang 110168 Peoples R China Shenyang Jianzhu Univ Sch Mech Engn Shenyang 110168 Peoples R China

Deep groove ball bearings are relatively weak in design for withstanding axial forces, but in practical applications, they may be subject to slight axial impact. Spalling failure may occur at a non-central position on the raceway. In response to this issue, this paper studies the axial impact characteristics generated in the bearing system due to uneven contact on both axial sides of the raceway when the rolling element passes through the defect area. A three-degree-of-freedom kinetic model considering the axial impact is proposed in this paper, simulating the effect of the impact on the rolling bearing when the flaking failure occurs at the non-central position of the roller path. The contact deformation area between the rolling element and raceway under axial forces and the position condition of the spalling fault in the raceway axial direction are introduced, and the impact characteristics of the spalling fault at different axial positions of the inner raceway are simulated by the time-varying energy method. Through comparative analysis of simulation and experiment, the variation characteristics of the vibration intensity in three directions of the bearing system when the spalling fault is at different axial positions of the raceway are obtained, and the correctness of the model is verified. This also provides theoretical support for improving the design and selection of bearings.

关键词： rolling bearing axial forces spalling fault non-central position dynamics modeling time-varying energy method

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dynamics modeling and Configuration Optimization of a Flexible Transportation System Using Two Space Robots

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IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS 2025年第2期61卷 4685-4696页

作者： Zhang, Yinbo Jia, Shiyuan Chen, Gang Chen, Ti Wang, Yifan Beijing Univ Posts & Telecommun Sch Intelligent Engn & Automat Beijing 100876 Peoples R China Nanjing Univ Aeronaut & Astronaut State Key Lab Mech & Control Aerosp Struct Nanjing 210016 Peoples R China

Space robots have been considered vehicles for the assembly of large spacecraft. Space robots offer the advantage of transporting modular structures to the target positions. This article investigates the dynamics and configuration optimization of a transportation system that contains two space robots and a flexible structure. The assumed mode method is employed to describe the vibration of the flexible structure, while the dynamics is modeled by the Kane method. Based on the dynamic model, a comprehensive performance index incorporating energy consumption and vibration amplitude is proposed to optimize the capture positions of the end-effectors and the configuration of each space robot on the flexible structure. The particle swarm optimization algorithm is adopted to solve the optimization problem. Various cases involving two transportation directions, four configurations of robot manipulators, and two magnitudes of vibration amplitude metrics are investigated. Numerical simulations are conducted to verify the feasibility of the optimized placement.

关键词： Robots Space vehicles Transportation Robot kinematics Flexible structures Vibrations Aerodynamics Vehicle dynamics Optimization Aerospace electronics Configuration optimization dynamics modeling flexible structure transportation particle swarm optimization (PSO) algorithm space robots

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dynamics modeling and attitude-vibration hybrid control of a large flexible space structure

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JOURNAL OF VIBRATION AND CONTROL 2025年第3-4期31卷 555-568页

作者： Zhang, Lei Fan, Wei Chen, Zheng Ren, Hui Harbin Inst Technol Sch Astronaut Inst Aerosp Vehicle Dynam & Control Harbin 150001 Peoples R China

The challenges in the dynamic modeling and control of large flexible space structures (LFSSs) include the high number of degrees of freedom in the model, the geometric nonlinearities in the flexible components, and the nonlinear coupling effects between overall motions and vibrations of the structure. In this study, we propose a systematic method to solve the mentioned problems in the research of LFSSs. We use the referenced nodal coordinate formulation (RNCF) to build the dynamic model. The modeling method is general and the model can better describe the large deformations of flexible structures compared with the modal-based dynamic model. The key feature of our work is that we use a hybrid control strategy for the attitude and vibration control directly performing on the full-scale dynamic model. Specifically, the control strategy combines a proportional and derivative (PD) control algorithm based on SO(3) for the attitude control and an analytical linear-quadratic (LQ) vibration control method for the vibration control. The simulation results are presented to demonstrate the effectiveness of the proposed hybrid control strategy both in the three-axis attitude maneuver task and on-orbit pointing scenario.

关键词： Large flexible space structures referenced nodal coordinate formulation dynamics modeling attitude-vibration hybrid control strategy attitude maneuver

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dynamics modeling and comparative analysis for underwater gliders considering different ranges of attack angle

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OCEAN ENGINEERING 2024年第Part1期312卷

作者： Tan, Lijie Wu, Hongyu Song, Yang Wu, Qingjian Jiang, Zhihong Yang, Yunqiang Yan, Shaoze China Univ Geosci Beijing Sch Engn & Technol Beijing 100083 Peoples R China Univ Sci & Technol Beijing Sch Mech Engn Beijing 100083 Peoples R China Tsinghua Univ Dept Mech Engn State Key Lab Tribol Adv Equipment Beijing 100084 Peoples R China Newcastle Univ Sch Engn Marine Offshore & Subsea Technol Grp Newcastle Upon Tyne NE1 7RU England

The underwater glider, which relies on buoyancy and attitude adjustments to achieve spatial motion, is an energy-saving observation platform for ocean phenomenon. Accurate dynamic models have important guiding significance for performance evaluation and controller design of the glider. This paper takes the Petrel glider as the research object, and establishes four types of dynamic models considering different ranges of attack angle, which has never been reported before. The model difference is mainly reflected in the viscous hydrodynamic equations obtained by using polynomials to fit computational fluid dynamics (CFD) simulation results. Then, some numerical cases are given to study the dynamics response difference of these models considering the ideal working condition and complex water current environments, respectively. The results indicate that there is not obvious dynamics response difference under the steady-state gliding condition, and the difference mainly occurs during the glider motion transition stage. Under the complex water current conditions, the dynamics response difference will be very significant, and the traditional dynamic models may exhibit the non-convergence issues. The comprehensive model established in this paper, which fully considers the ranges of attack angle, can better simulate the dynamics behavior of the glider and can provide certain theoretical guidance for actual application.

关键词： dynamics modeling Underwater glider CFD analysis Attack angle range Comparative study

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dynamics modeling and impact resistance study of the marine gas turbine isolation system

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OCEAN ENGINEERING 2025年 331卷

作者： Zhou, Yanfeng Chen, Weifang Wang, Dan Zhu, Rupeng Nanjing Univ Aeronaut & Astronaut Coll Mech & Elect Engn Nanjing 210016 Peoples R China Nanjing Univ Aeronaut & Astronaut Natl Key Lab Sci & Technol Helicopter Transmiss Nanjing 210016 Peoples R China

The isolation system, which protects the gas turbine by isolating the impact from the ship's hull when the ship is impacted, consists of a steel frame and isolation elements. A rate-dependent generalized Prandtl-Ishlinskii model is proposed and the mechanical models of the isolation elements are developed, which are verified by impact tests and found to have a maximum error of 3.05 % in relative displacement and 9.75 % in acceleration. The steel frame is discretized into multiple Timoshenko beam cells, and a stiffness matrix establishment method for spatial rigid-flexible coupling unit is proposed to establish the dynamics model of the isolation system. The maximum error in the natural frequency of the steel frame is found to be 8.44 % by comparing with the simulation results, and the maximum error in the natural frequency of the steel frame-gas turbine system is found to be -10.62 %. The impact dynamics calculations are completed based on the pseudo-force method, and the influence of the isolation elements arrangement on the isolation performance is analyzed in conjunction with the energy transfer between modes. The isolation system has the highest energy share for the 7th, 8th, and 11th order modes, and it does affect the energy share of each order mode when changing the number, position, and spacing of the isolation elements.

关键词： Gas turbine Impact resistance Rigid-flexible coupling unit dynamics modeling Modal analysis

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Physics-guided ODE neural network for high-fidelity gearbox dynamics modeling based on vibration measurements

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MECHANICAL SYSTEMS AND SIGNAL PROCESSING 2025年 232卷

作者： He, Rui Yang, Xingkai Wang, Yifei Tian, Zhigang Zuo, Mingjian Ye, Zhisheng Natl Univ Singapore Dept Ind Syst Engn & Management Singapore 119077 Singapore Hunan Univ Coll Mech & Vehicle Engn Changsha 410082 Peoples R China Univ Alberta Dept Mech Engn Edmonton AB Canada Shandong Univ Sch Qilu Transportat Jinan Shandong Peoples R China Qingdao Int Academician Pk Res Inst Qingdao Shandong Peoples R China

High-fidelity dynamics modeling of gearboxes is the prerequisite for developing digital twins capable of elucidating failure behaviors under varying speed conditions. However, traditional approaches, such as finite element and lumped parameter models, often exhibit discrepancies from real-world measurements. This issue is particularly pronounced in complex systems, which limits their practical applicability. To overcome this limitation, we propose a novel physicsguided ordinary differential equation (ODE) neural network. This method integrates a neural network into the gearbox dynamics model to address model incompleteness, specifically the discrepancies between theoretical predictions and actual system behavior. Real acceleration measurements are utilized to calibrate both the neural network and the overall dynamics model, enabling the inference of unknown dynamic parameters without the need for prior determination. By aligning simulated responses with experimental data, the model captures system dynamics with high accuracy. The proposed physics-guided ODE neural network is fully differentiable with respect to both model incompleteness and undetermined dynamic parameters. The effectiveness of this high-fidelity modeling approach is demonstrated using an experimental two-stage gearbox system. Validation against experimental test rig data under varying rotational speeds and faulty conditions confirms the model capability to replicate real-world dynamic responses.

关键词： Gearbox system dynamics modeling Vibration measurements Physics-guided ODE neural network

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dynamics modeling and placement optimization of multi-robot system for the transportation of flexible structures 19

Dynamics modeling and placement optimization of multi-robot ...

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IEEE 19th Conference on Industrial Electronics and Applications (ICIEA)

作者： Zhang, Yinbo Jia, Shiyuan Chen, Gang Wang, Yifan Beijing Univ Posts & Telecommun Sch Automat Beijing Peoples R China Beijing Univ Posts & Telecommun Sch Artificial Intelligence Beijing Peoples R China

ISBN: (纸本)9798350360875;9798350360868

Space robots have been considered as vehicles for the assembly of large spacecraft. Multi-robots offer the advantage of transporting the modular structure to the target position. This paper investigates the dynamics of a multi-robot connected to a flexible structure rigidly by manipulators, along with the optimization of end-effector placement on the flexible structure. The assumed mode method is employed to describe the vibration of the flexible structure, while the dynamics are modeled using the Kane method. A comprehensive performance index is proposed based on the model, incorporating energy consumption and vibration amplitude. The placement of end-effectors is optimized using the particle swarm optimization (PSO) algorithm. Various cases involving two transportation directions and two magnitudes of vibration amplitude metrics are investigated. Numerical simulations are conducted to demonstrate the feasibility of the optimized placement.

关键词： dynamics modeling Placement optimization Space multi-robots Flexible structure Particle swarm optimization algorithm

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A review on DFACS(I):System design and dynamics modeling

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Chinese Journal of Aeronautics 2024年第5期37卷 92-119页

作者： Bohan JIAO Qifan LIU Zhaohui DANG Xiaokui YUE Yonghe ZHANG Yuanqing XIA Li DUAN Qinglei HU Chenglei YUE Pengcheng WANG Ming GUO Zhansheng DUAN Bing CUI Chu ZHANG Xiaodong SHAO School of Astronautics Northwestern Polytechnical UniversityXi’an 710072China Innovation Academy for Microsatellites Chinese Academy of SciencesShanghai 710699China School of Automation Beijing Institute of TechnologyBeijing 100081China Institute of Mechanics Chinese Academy of SciencesBeijing 710043China School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China School of Automation Science and Engineering Xi’an Jiaotong UniversityXi’an 710049China

The Drag-Free and Attitude Control System(DFACS)is a critical platform for various space missions,including high precision satellite navigation,geoscience and gravity field measurement,and space scientific *** paper presents a comprehensive review of over sixty years of research on the design and dynamics model of ***,we examine the open literature on DFACS and its applications in Drag-Free missions,providing readers with necessary background information on the ***,we analyze the system configurations and main characteristics of different DFACSs,paying particular attention to the coupling mechanism between the system configuration and dynamics ***,we summarize the dynamics modeling methods and main dynamics models of DFACS from multiple perspectives,including common fundamentals and specific ***,we identify current challenges and technological difficulties in the system design and dynamics modeling of DFACS,while suggesting potential avenues for future *** paper aims to provide readers with a comprehensive understanding of the state-of-the-art in DFACS research,as well as the future prospects and challenges in this field.

关键词： Drag-Free DFACS System Design dynamics modeling Control design

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